Walter Gropius and Mie van der Rohe | Comparison

Walter Gropius and Mie van der Rohe | Comparison As it known about two famous German architects, Walter Gropius and Mies Van de Rohe, who had been worked together and made a great contribution to the world architectures. Although both of them focus on the Modern building technology, they still have their own unique features and design philosophies. Walters main themes of architecture is standardized house, prefabrication and developed house for low-income workers whereas Mies Van de Rohes Less is more and God is in the details are his famous sayings. This essay talks about the two famous architects from Germany and the similarities and difference between their unique architectural buildings. In this essay, some of the greatest masterpieces before WW2 such as the Tà ¶rten Estate, skyscraper, IIT campus buildings are mentioned below. Walter Gropius, a German architect and educator, who established the Bauhaus school of design, which has become a predominant force in architecture in 20th century. Gropius was famous for the Bauhaus style and the prestige of the architecture had established when he grouped with Adolph Meyer. Walter Gropius went against the Nazi regime and escaped Germany secretly in 1934. He taught architecture at Harvard University in Britain after a few years. Then, the Bauhaus concepts and design principles were generated and introduced by him. During the 1938 to 1941, he worked on some houses with Marcel Breuer and all of them established the Architects Collaborative in 1945 (Jackie Craven n.d). Ludwig Mies van der Rohe, another prestigious German architect, who had worked with Walter Gropius and highly regarded as one of the pioneering masters of Modern architecture. Although he had never received any formal education in school, it would not stop the pursuit of establishing a new architectural style. Less is more and God is in the details are his aphorisms. He continued to seek a rational method that could navigate the innovative process of architectural design and strived to a concept of minimal framework of structural order fight against the freedom implication of free-flowing open space-skin and bones building style. Mies van der Rohe became well known for the glass and steel, this style clarified that the Barcelona Pavilion expressed as well as the planar inner walls that are an outgrowth of the belief that space must be made universal and flexible (Ludwig Mies Van der Rohe: architect biography 2011). Mies s design for the housing was stemmed from his early study of the Kari Friedrich Schinkel. This project was famous from drawing and photographs. In 1912, Mie established his practice as an unique architect in Berlin. At that time, there was a competition that had been held for a skyscraper design on Friedrichstrasse in Berlin. Although Miess scheme was successful and forward-looking, the project could not be accepted due to the poor conditions would not match with the solution (Ludwig Mies Van der Rohe: architect biography 2011). Walter Gropius- design philosophy The architectural design of Walter Gropius was on the basis of the new architecture, which was not just about shelter any longer, but a kind of expression. The whole world has changed the idea from the gigantic structures to the stability and protection of the architectural buildings. In the modern age, we can concentrate on the architecture itself and the pursuit of our humans expressed feelings. Walter Gropiuss ideology of designing buildings is far more advanced and preferable to the modern time than turn people in the past. He has more focused on the central expression and utilitarianism of every buildings rather than beautiful structure and extravagant materials (Design Philosophy 2011). Walter Gropiuss New Architecture included the new materials and modern technologies of the World. He said that excellent design should be available to all and truly believed that it was not impossible by using standardization and prefabricated homes. The use of walls was just the most distinguishing angle of the buildings he designed. The simple form that provided by him was the best way to express life (Design Philosophy 2011). Bauhaus/International style of architecture has a number of unique features: namely, functionality Vs ornamentation, asymmetry and regularity Vs symmetry, and space Vs mass. Walter Gropius gave up the old concept and style of the architectural building, while he mainly put these three ideas in the front line- functionality, asymmetry and space. Bauhaus buildings are normally cubic with right angles; they have smooth facades and an open floor plan (Yael Zisling 2000). Bauhaus architecture primarily relates to the social aspects of design and workers departments. Tel Aviv, a newly evolved city, which embraced the style. This style of architecture was popular at a time due to the new engineering advancements that allowed to be built around steel or iron frames, that was, the walls did not support the structure any longer, but only enveloped from the outside. The International Style was the kind of architecture that never depended on the past style of the buildings; conversely, it made an attempt to set up a new and modern style. In Tel Aviv, Bauhaus architecture benefited a foothold because there was no real entrenched architectural style. However, the style of the architecture could be discovered in many places in Tel Aviv (Yael Zisling 2000). Ludwig Mies Van de Rohe design philosophy Miess glass skyscraper proposal actually had not been accepted by those clients because there was a thirty-story tower designed for an usual site situated near the crossing of the broad avenues, and this free-form scheme without any effective solutions for the structure. In 1923, the proposal was known from the photos of a model and several drawings. It can be shown from this project that Mies Van Der Rohe moves to a real modern style, it has become of great interest. He took over a number of studies of these architectures, which includes block building at that time (Ludwig Mies Van der Rohe: architect biography 2011). In 1924, the plan for a brick building has a close resemblance to the de Stiji paintings of Van Doesburg. Mies Van der rohe regarded the brick as an old material and utilized it in the design for this planed country house. The Walls were free standing, sliding out from beneath the roof into the landscape. The walls linked with glass enclosures produced an entirely new effect, with radical implications for living style. Mies van der Rohe used these concepts to good effect in the Barcelona Pavilion of 1929 (Ludwig Mies Van der Rohe: architect biography 2011). Walter Gropius -technology Due to the Industrial Revolution, the world had evolved dramatically, while art schools ignored new technology and ideas. Gropius supported students to exploit new industrial materials and processes. Walter Gropius believed that art should serve the proletariat and those of completed buildings. The main themes of Gropius architecture is standardized house, prefabrication and developed house. These ideas were applied into his private missions. In 1926, Gropius designed a 60-dwelling low-income community in Dessau, Germany- the Tà ¶rten Estate. He often helped the urban workers who live under the poverty lines. In order to help those poor workers, Gropius planed to design economical buildings with small but comfortable rooms by using cheap materials like cement and prefabricated elements. He tried to improve the sunlight and air circulation in the room by placing the windows (Walter Gropius and the Legacy of Modernism / Maddie  Wardley 2011). At present, most of the modern buildings adapt the Bauhaus style. There is a typical case of Truro House design. This house makes full use of the energy-saving techniques like solar power and it is divided into the wings. One is used for family visits and could be closed to reduce the energy. Just as Gropius, the buildings prefer to white color, big windows and a flat roof. The structural elements have been exposed under the sunlight. Perhaps Gropius fancies about the transparency in these buildings so that visitors can see through the construction and inner workings. Therefore, the Truro House can demonstrate a theme of technology, comfort, conservation and functionality by this famous designer. Up into now, the architecture is still largely affected by Bauhaus Modernism (Walter Gropius and the Legacy of Modernism / Maddie  Wardley 2011). Mie van der Rohe Technology Mie van der Rohe designed Czechoslovakia in 1930, the largest luxurious Tugendhat House in Brno. On a sloping site, this building is with a compact two-story plan and entered from the street at the higher level. The living rooms and dining rooms give more space and quality. Its use of exterior terraces on both levels is omparable to Le Corbusiers Villa Stein in Garches, France, 1927. The house is the same in function as large, late nineteenth-century country houses. Individual spaces could be shut off using draperies on ceiling tracks. The curved wall denning the dining room is Macassar wood, with an onyx freestanding wall denning space between living area and study. The Brno chairs designed for this house have been generated. The house suffered damage and is now owned by the city of Bmo (Ludwig Mies Van der Rohe: architect biography 2011). Ludwig Mies van der Rohe was counted among the founders of modern architecture and design. One of the most emulated architects of the 20th century, he taught architecture for almost 30 years. Mies came to Illinois Institute of Technology to head the universitys Department of Architecture soon after the closing of Bauhaus, the renowned design school that flourished in Germany from 1919 until the rise of Nazism in 1933. During his 20 years as chairman of the department, he built up a curriculum based on the Bauhaus philosophy of synthesizing aesthetics and technology. He strongly emphasized on the grounding in the fundamentals of architecture and on a disciplined method of problem solving is reflected in IITs curriculum. According to his career, Mie had affected a great many architects and they made his theories into a movement (See Architecture 2011). His own designs, ranging from the Barcelona Pavilion in Spain to the Seagram Building in New York to IITs S. R. Crown Hall changed the skylines of cities all over the globe. Mies established Crown hall, which depicted on the banquet stamp, in 1955, was considered to be one of his greatest architectural masterpiece. In order to provide for a flexible, columnless interior, Mies stopped the roof from four steel girders maintained in the midway through eight external columns. Crown Hall has been regarded as an immortal contribution to the architecture of Chicago and the world. In 1941, Mies also designed the masterpiece of IIT campus, which was the most remarkable projects he believed and the only person to come close to attaining the whole realization. There are 20 architectural buildings around the old campus, which are the greatest Mies-designed buildings in the world. Hence, IIT campus has become a landmark of Chicago(See Architecture 2011). Similarity Difference Not surprisingly, it is evident from the details provided that there are some similarities and differences between Walter Gropius and Mies attitudes toward the technology and stylish building to the specific group of people. Walter Gropius focuses on low-income workers and he tries to build up the affordable and comfortable homes for people. Moreover, he considers the cost consumption of materials, the architectures practice, space, sunlight and air circulation. Further, he believes that architecture should express a kind of feelings or theme rather than its extravagant materials consumption and too distinguished surface. It has been discovered that the buildings that Walter Gropius designs are almost the peoples living place and the structures are modernized and fully transparent. The Bauhaus/ International style of architecture hold its ideology: functionality, asymmetry and space with lower cost consumptions. This would be fine match with the modern peoples perceptions and demands. However, although Mie van der Rohes architectural style still toward the Modernism, it seems that Mie vans buildings are far more preferable to the metropolitan building such as skyscraper. This is the striking difference between the Mie and Walter Gropius. The Mie van der Rohe has strongly emphasized the details, qualities and aesthetics. For example, the living rooms and dining rooms give more space and quality. Its use of exterior terraces on both levels is omparable to Le Corbusiers Villa Stein in Garches, France, 1927..Also his architectural buildings normally located on the Campus or the city centres, IITs S. R. Crown Hall is the one case to prove it. Mies architectural theories can build up a big city for one country whereas Walter Gropiuss can establish a comfortable home for people. Maybe this is where the difference is. Still, there remain some similarities between them. First, they both apply modern technology to the building establishment; second, no matter Walters the three main themes or Miess God is in the details, they all made the greatest contribution to the human race, to the country, to the modernization. Meanwhile, they hold the common attitude to the modern technology and impart their way of thinking to the next generation. Conclusion All together, this paper discusses the main architectural styles and design philosophies from Walter Gropius and Mie van der Rohe before the second world war. Walter Gropius prefers to the functionality of the building, while Mies is more likely to design it in an aesthetic way. They both have the typical masterpieces which located in different places. There are also a lot of research findings about their architectures, designs and attitudes toward the modern technology. Based on these series of comparison and contrast, it has been noted clearly that the situation of architectural development and technology goes to the certain extent that has already reached the contemporary design model-skyscrapers or the Tà ¶rten Estate, unfortunately, the conditions of architecture could not meet the requirements of solutions at that time. Nevertheless, their ideas have surpassed all the unavailable conditions and exerted the strong power to push the historical movement. How do children learn? How do children learn? How do children learn? Describe and evaluate behaviourist and cognitivist theories of learning, with reference to influential researchers and writers in each field. Child development that occurs from birth to adulthood was mostly ignored throughout much of history. Children were often viewed as small versions of adults rather than individuals and little attention was paid to the many advances in cognitive abilities, language usage, and physical growth. It wasnt until early in the 20th-century that interest was taken in the field of child development. This then tended to focus on abnormal behaviour. The following are some of the theorists that specialized at looking at cognitive development; these include Piaget, Bruner and Vygotsky. Jean Piaget (1896 1980) was a constructivist whose work has been a major influence both on child development and on learning and education. Piagets view was that from birth to adulthood children pass through a number of different stages of cognitive and mental development. As well as this he highlighted that the individual child played a big role in their own development and learning. He also recognized that the social environment plays a part alongside this. Although recognizing this he did not emphasize it, therefore his work focuses on the individual child impacting his or her own development. Piaget broke his cognitive development in to four different stages; Sensori-motor (birth to around two years), pre-operational (two to around seven years), concrete-operational (seven to around twelve years) and finally formal-operational (twelve years and onwards). As I said above although these stages have ages against them all individuals learn and development at their own rate and so may not hit these stages at the same time as all their peers do. This is something you see in schools and why work needs to be differentiated for the different abilities as they are all learning at their own rate. Piaget also believed that children learn through processes of adaptation which is known as assimilation, accommodation and equilibration. An example of assimilation can be that child A establishes the concept of cats as black. Child A then progresses to accommodation where the toddler ‘accommodates new information that cats can be different colours. Equilibration is where child A then needs to have this reinforced by further experiences before accommodating this in to their understanding. Schemas are one thing that came out form Piagets work. These are early ideas and concepts based on linked patterns of behaviour and are part of the childrens way of understanding their experiences. Schemas often occur in clusters and dominate a childs play at any one time. For example the idea of transporting, children will take time to investigate the different ways in which to move objects, such as using bags, trucks and trolleys. Jerome Bruner (1915) and Lev Vygotsky (1896-1934) built on Piagets theory. They stressed the role of play, talking with adults and interacting with the social world. Piagets view of the child being a solitary learner is here replaced by that of the child as a social being. Children use their learning skills and knowledge of their own culture, received from adults to develop their ideas and learning that they could not do as a solitary learner. Vygotsky saw children as active organisers of their own lives which agreed with Piaget however he extended this to believing that social relationships and interaction with other people where needed to develop intellectually and that â€Å"knowledge develops through interaction with others† (Mistry, M 2009) So where Piaget emphasized the individual learner, Vygotsky is now emphasizing the role of the adults in helping children learn. From this he identified the ‘zone of proximal development, which is where children show signs about being ready to move on in their own development and learning. Adults then need to intervene and â€Å"help children to move into the zone of actual development and the cycle goes on.† (Smith, M 2006, p117). There are other areas in which theorists have specialized in, one of them being behaviour. Some of these theorists are Pavlov, Skinner, Bandura and Watson. These theories are part of the transmission model which builds on the thinking of the philosopher John Locke (1632-1704). Transmission theories are less to do with what goes on inside the mind and more to do with what goes on with the external outputs and influences of learning. There are two main components of transmission theory: learning theory and social learning theory. This is where those theorists come in so will look at them in more detail. The learning theory is where children learn through experience, this is shown through classical conditioning and operant conditioning. Ivan Pavlovs (1849-1936) work on the behaviour of dogs is an influential example of how the learning theory has developed through the twentieth century. Pavlovs research consisted of conditioning dogs by feeding them when a bell rang or a light shone. This progressed and went on for some time until finally when the bell rang or the light was flashed the dog would automatically salivate. The dogs had been conditioned to this way of thinking. This is something that is reflected in schools today for example when the bell rings at the end of the lesson the children then know that it is then a break time. This is repeated everyday during school and so the children become conditioned in to this way of thinking. These behaviours are continued through life even by teenagers and adults. For example at secondary school when the bell went at the end of a lesson myself and peers would automatically make the move to pack up our things and move to our next lesson or on to break time. Other things that we condition children to do is sit on the carpet with their arms and legs crossed. Also to hang their coats up and put their bags away, this becomes and automatic routine for children when they come in to school in the morning. Further development from Classical conditioning is Operant conditioning which psychologist B. F Skinner worked on. This operant conditioning is more to do with shaping and modifying behaviour rather than creating certain behaviour patterns. Skinner again worked with animals during his research, he gave the dogs food as a reward. The food was used as positive enforcement, if the dog was not to do what Skinner wanted he would ‘punish them by giving them electric shocks for example. Doing this repeatedly meant that the bad behaviour the dog presented with soon became eliminated. This works the same way for children, good behaviour is rewarded with stickers or golden time for example and the bad behaviour would be treated with detentions or telling off, singling out. This then works in the classroom as well, the children learn what behaviour is expected of them and what they will get in return for what they do. Smith, M (2006 p112) says that â€Å"By selectively reinforcing behaviour that is wanted adults can change the way children behave. This is called behaviour modification.† The social learning theory is where children learn through example. This leads on from the Learning theory but also emphasizes that children learn behaviours by observing and imitating adults, especially those that are important to the child. Some of these may include family members and the class teacher or other professionals that the child may work with. It has also been shown that children imitate each other. Albert Bandura (1925-) did an experiment using Bobo dolls. He showed three groups of children a doll being kicked and hit by other children which was then followed by showing a different consequence to the different groups. One of them being told off showing the behaviour was unacceptable, one being praised for what they had done and the last was not shown any consequence. After this they were then put in a room to see how they would react. This then showed Bandura that children would repeat what they had seen. This is seen in schools as well, both positively and negatively. Having mixed ages in classes or on the playground together means that younger children can look up to the older children and imitate their behaviour. The older children have been in the school longer therefore know how to behave more for example lining up in the playground at the end of lunch, the smaller children can then see this as an example and know what is then expected of them. John Watson (1878-1958) is another theorist that looked at conditioning behaviour. His research consisted of conditioning children to have a fear of a small white rat. He would present the rat alongside with a loud noise or bang which would scare the child. Although this then proved the theory of conditioning children the ethics of the experiment are often criticized today, especially because the childs fear was never deconditioned. Today in schools both the cognitivist and behaviourist theories are used. Without even knowing it, the teacher and whole school will have conditioned their children in to their overall daily routine as well as routines they take part I throughout their day. It is also shown in day to day lesson the differentiation that the teacher puts in to them in order for the children to be able to work at their own rate but still be pushed and progress through the work they are doing. Through the school planning and class planning these theories are used in everyday circumstances. 1550 words Part 2: 1500 words To what extent should theories of how children learn influence the way a class teacher plans and teaches lessons? Justify your answer with specific examples from your own experience and your reading. Our education system would not be the same today without the influence of many different theorists. Theorists such as Vygotsky, Pavlov, Piaget, Skinner and many more have influenced our day to day working with young children and people. I believe that theses theories are important and hold vital reasoning behind the way children act and learn throughout school and play. I myself without knowing will have used some of the techniques used by these theorists in their research for helping the children in my care progress. I think it is important to have knowledge about the theorists and to implement them to a certain degree in everyday teaching. For example Vygotskys theory Zone of proximal development, the teachers need to be aware of the levels of cognitive development in the group in order to know the right amount of scaffholding to give to the children. Teachers also need to work out strategies and provide tools for the children to realise and scaffhold themselves to move on to the next level. This development can be shown with differentiation in the classroom. In a school I have recently worked in they used this technique of allowing the children to recognize what level they are at and where they need to be working. Although the children were differentiated in to ability groups the children were given the opportunity to choose at what level they worked at for some of the activities. The Zone of proximal development kicked in when the child then felt ready to move on. The teacher would have extension work for all groups, lower groups were given the next levels work and the higher ability group would be given further extension work to better themselves. This is a reflection of Vygotskys theory allowing the children to have a choice and encouraged to challenge themselves, which they would often do willingly. Scaffholding which I have mentioned above is a term used by Bruner. Using this in the classroom may consist of providing clear and realistic goals, providing examples for the children to see on the board, making the task in to manageable chunks and also aiding the children with any parts that may cause frustration. â€Å"An example of this might be when a parent helps an infant clap or roll his hands to the Pat-a-Cake rhyme, until he can clap and roll his hands himself.† (webpage 2 bibliography) This I have also seen in a school before where the teacher would demonstrate the lesson before hand on the board. A clear ‘I can statement was also put on the board for all the children to see the objective for the lesson, this was then copied down as the title for that days work which meant they could easily see if they had met their target or not. If at any time the majority of children or a large group of children were finding a specific task difficult the class teacher would stop the whole class or ask those finding it too challenging to come to the front and work through it together before going back to tackle it individually again. In one school I have worked in they grouped all their foundation subjects and science into one, calling it Topic. This covered all the subjects well and although the whole class did this together without differentiated tasks the children would be learning and building on their knowledge at different rates. For example if the topic was space there may be children that are coming in to the work with a lot more background knowledge than those of others. In this case they are able to help those that need it and guide them to gaining more knowledge themselves. This shows and highlights that all children learn at their own rate as they can take in and hold different amounts of information. This reflecting the theory of Piaget where he states that children learn differently and at their own pace. I feel the most used theory is the reward system within the classroom and whole school. This is something that I have seen used in every school I have been in to and is a development from Skinners theory. His theory was to reward dogs for good behaviour and punish them for behaviour that he did not want. This is used in every school to a certain degree. For good behaviour in school you could give the children stickers, golden time or person of the week. As well as this for bad behaviour certain sanctions could be put in place for example extra work, missing of break times, informing parents, loss of privileges and even exclusion if it comes to that. The school I have recently worked in had a sticker reward system where the children gained them for good behaviour, good work and excelling in extra duties or work. This sticker was then ticked off in their work and put up on a class sticker board of one hundred. When they have filled this up they get a reward of an extra fifteen minute break time, they then start another hundred square and after that get another class reward. Therefore instead of individuals getting the rewards they are working as a group to progress and get them. They have certain sanctions for punishment put in to place as well. (Appendix 1) Although reward systems are widely used in schools â€Å"There is a debate about the appropriateness of rewarding good behaviour with stickers or small treats since it could be assumed that good behaviour is the norm.† (Jacques, K 2007 p127) Pavlovs original Classical conditioning of getting the dog to salivate awaiting food when the bell rang or the light flashed is still seen in schools today. Examples of this would be that when the bell rang at intervals during the school day the children recognize that it represents the end of a lesson ready for break time or that it is even home time. When this happens the children begin moving about anticipating the teacher saying you may go out. Another example of this is when you ask the children to come and sit on the carpet they will go and sit with their arms folded and their legs crossed. This is because at a young age when in nursery or reception this is the expectation therefore the children have been conditioned in such a way to continue showing this behaviour. This was something I have done myself even up to the ages of 14 or 15 at secondary school when we had assemblies where we had to sit on the floor, we would all sit still with our legs crossed. I think this benefits a lot of children having a routine that they do most days and having expectations of behaviour given to them by the class teacher and school. However some of these are not always beneficial for when they get to an older age for example during school many children will be asked to be quiet and work quietly and then when they are asked unexpectantly to share with people and feedback to a group they do not have the confidence or the ability to do so well as this is something they are not used to doing. I think this is even shown at our age in University seminars that I take part in now as you can see the students that have the better ability at speaking in front of others. Having said this at schools now I feel that they are taking advantage of the use of talking partners and group discussions to help involve all students in speaking in public and in front of their peers. In conclusion I feel that there are advantages and disadvantages of taking on board the different theories and using them in everyday practice. I have seen in many schools implications of the theories being used. Although all these are very beneficial and aid in how the school day runs and the flow of the day there are a few disadvantages to think about. One being the fact that children are conditioned for certain things that may not help them in later life, as I have stated above that we condition children in being quiet a lot of the time while working, this can influence their ability in older life to not feeling confident enough to talk in front of others. This is something that I can speak of from experience. However after taking all this in to consideration I feel that the theories do help to improve the working environment in different settings. I think the theories are very practical with working in todays school environment.

Morrison and the Intersections of my Life Essay

When I was younger I recall the haunting yet beautiful music of the Doors, led by Jim Morrison. I would feel connected to the music that I heard, but barely took the time to pause in my effort to understand the man behind the music. It was only when I was older and I began to contemplate serious matters of life, such as death and the legacy we leave for our families if we are so lucky to grow to an old age, that I began to look into the life of this man. He was unlucky to have lived a relatively short life, his music however and the way that he playfully dismissed conventions were his most important skills that he passed down to people like me, who are interested in the genius of men like him. The more I looked into Morrison’s work, the more I saw parts of myself. I think that sometimes people look unto others to find such a spark, something that reminds us that life is short, sometimes to a tragic degree. But what we do with our lives and what we leave behind are what we must focus on from time to time to be sure that we have lived life to the fullest and expanded our minds to as far as we could, until there was just nothing left to do. Morrison still maintains his position in our lives even in his death. He remains an elusive figure, complicated and suffering in the world due to his intelligence. His high IQ was likely more of a burden to him, an alienating source of frustration when he could not find other like-minded people to share his thoughts with. It is a likely thought for the religious people in the world that he is in a place that is better for him now with the writers and philosophers that he loved to read. This is something that I so deeply understand and connect with, the feeling of wanting to connect with others but having a barrier there between myself and others. Whether it is because of intelligence, chosen discipline, ethnicity, etc†¦ I believe everyone feels disconnected with others, at times. For some, this disconnect may bring upon a search for something that makes sense, an interconnectedness with others. Some may find religion, or music, or others on the same path. For me, I found a sense of enlightenment on discovering Morrison and his journey. He seemed to embrace his disconnectedness and turn it into an art. Although Morrison did feel a sense of disconnect with those around him, there are aspects of his life that can be connected when looking at his biography. The connections made with his experiences and his behavior can be further expanded to experiences in my own life. His childhood, for example, was cold and unfulfilling. His father was a U. S. Navy Admiral, which caused their family to move frequently (Kirjasto, 2000). There was never a healthy relationship developed between him and his father. When his father was as home he had an authoritative way of parenting, which likely led Jim to later have issues with authority figures and laws. Morrison most likely played the role of an underachiever as a young man, because his parents would not allow him to make his own decisions. Therefore, he left home and hitchhiked to California to follow the career that was forbidden by his parents, filmmaking (Cristafulli, 2000). After this he was shunned from his father and begun his lifetime of freedom amongst uncertainty and mystery. By looking at the restrictions placed upon Morrison and the rift between him and his family, many young people would likely see similarities to this in their own life. I, too, felt a distance between myself and my parents and begun to question my intentions in life in terms of the reasoning for what I was doing. When I began to wonder about whether or not I was following my own path or my parents’ ideal, I began to feel a sense of restlessness stirring inside. I wanted to rebel and do less than my best just to spite them. I hated certainty and the implications of securing a certain future with a life that had been set up for me. But, I did not go to Jim’s extremes of going against my family totally, though I did move away for college. I kept everything inside until I moved, thinking that everything would be different, that I would be different. But, I saw and realized that authority is authority, regardless of if it is parents or teachers or whomever. So, freedom is different than it may seem when you are young, it is scary and lonely, because when we are free to be ourselves, we are alone. We don’t feel free collectively, it is different for everyone. Morrison tried to do his best, however, to free people from the tensions and constraints they felt in the volatile era in which he performed. When I feel lonely and understand that I am going through a fundamental change in life, to become a higher functioning person that is not constrained by my past or any other chains that might bind my mind, I think of how it might have felt to go to one of the Doors concerts. I picture people, who are deep in their own thoughts of how to climb up to a more aesthetic purpose all together and it is comforting. Though I have went to many concerts of current musicians, there is some allure and pull back to the past when life was different and people were different. From this I try to remember that it is not only a journey we all must take to understand our individual past and how we arrived to our current mode of thinking, but also we must learn about the culture of our ancestors to see how we, as people, have arrived to this time and place. Jim Morrison was completely obsessed, one might say, with his perfect ideal of freedom, just as he was occupied with thoughts of a distant past. He, like most students of life, attempted to reconcile this past with his future. Though his life was most interesting as it was tragic in the way in which he attempted to blot out his present. He told his fans and those close to him that he was trying to expand his thinking while many believe that he was using drugs and alcohol as an escape. Regardless of why he was using substances, it is important for every young adult to question their quest for knowledge, as to why one is questioning their lives and the world at large. Even if we do not use drugs, as I do not, the exhilaration of finding out elusive secrets of life may be an intoxicating experience in itself. It is so much easier to look toward other people and other topics than to look inward at yourself. Morrison lived his life this way in the extremes of life’s possibilities. He turned to a much distant and disconnected past, though he believed that there was a sense of spirituality in what he described. It is likely that Jim suppressed his more mediocre thoughts in his past to invite in other more exciting thoughts to create a persona that would be remembered far beyond his own death. He would rather talk about experiences that could not be proven by any method and explore topics that were uncomfortable for others to deal with while encompassing them in music that was comfortable to listen to. His extreme positions taken in his poems were compounded in his sometimes irrational and incomprehensible behavior. These extremes were staggering in there visibility to others and Morrison seemed to revel in the controversy that he created. It was quite possible that he thrived on the attention while he also wanted for peace and calm. These two vying states of being along with his unresolved tensions in his past and future led to an explosive life. This makes me think of the importance of balance between the extremes of life to achieve understanding and happiness, but also to have a freedom to explore the extreme nature of our lives. I believe that people like Jim Morrison are necessary to understand, as it would be unhealthy in many ways to live his type of lifestyle. While many of us seek to achieve a limitless understanding of ourselves and our world, we must constantly evaluate and reevaluate our lives with the limits that we find along the way. We are, for example, slaves to our own limits of intelligence, we can only know so much. Jim had a high IQ, stated to be 149 (Kirjasto, 2000). He seemed to possess a wide understanding in what he read in books and studied in college, but he concentrated much of his life to pursuits that could not be studied, proven, or disproved. Many would say this was a waste of time. But, can we really understand how such an intelligent person could live in a world were things seemed so simple to them but not to us? What one person may think is rational and simple another person may see as irrational and difficult. In this way, we are stuck to the limits of what we can prove about our existence and what we can agree upon with others. What may seem to one person as disagreeable in another, may simply be a person using their intelligence in ways which we cannot understand. It may be a universal truth, then that what we can all agree on is that we will disagree. To see someone like Morrison, who constantly clashed with authority and fought the conventions of society, reminds us that we must agree that we will not always see things the same way as others. If we can grasp this concept fully in another person’s life, we can surely grasp it in our own. We can value others for their struggle to be who they are and to stand for something. We can appreciate conformity through seeing nonconformity and we can appreciate silence by listening to music. Sometimes we can learn more about things from looking at the extremes and opposites of what we have and what we do not have. For Jim life was a constant struggle to reconcile living with dying. His poems and songs are wrought with themes of death and destruction of madness and sanity. It may be stated that he wished to appreciate his life more by understanding death and he wished to appreciate his mind and his intelligence by studying themes of insanity and inducing drug and alcoholic states of numbness. There is a lesson to life in this behavior, as well. It is like the phrase that many of our elders like to teach to us, that we want what we do not or cannot have. This is especially important to college students, as many of us are confused in what to study and what to be once we are graduated. It is this fear that prevents all success in life. We are afraid that if we chose a career path that we might want to change our minds, so we tend to make hasty decisions just to get to over with, so to speak. The rumination over choices that present themselves as black and white, right or wrong type of thinking can hinder our growth. There is that gray area in between all things that we must explore. Though we do limit ourselves and become somewhat constrained once we do make a choice, the discovery of what we decide to do is an amazing journey and we must appreciate that. The journey of an entire life, the biography of another, interesting person is something that is important for all of us to look at. When we become mired in our thinking, unable to be creative or objective, we can take a step back and see how another person survived their struggle and then how they died from it or in spite of it. In this case, Morrison decided that he would taunt and tease his worst fears and he died from the excesses of this struggle. Morrison explained, â€Å"expose yourself to your deepest fear, after that fear has no power and the fear of freedom shrinks and vanishes† (Crisafulli, 2000). I believe that if we understand our fears then, indeed, we can overcome them. But if we constantly expose ourselves to our fears and the negative thoughts that arise from combating the deepest and darkest corners of the imagination then we are inviting chaos into our lives. Though Jim seemed to be a master of harnessing his inner chaos into his art, we must all of us, understand that we have limits on what we can make out of our turmoil. If we are seeking a simple understanding and a sense of finality to our fears and not making art with our deep imaginations, then we must be careful to not live to hard to fast and to wait patiently for understanding to emerge in our lives. I believe that for some, patience is a near to impossible state of being. We may feel that we have to rush our lives to complete everything there is to do and that there are not enough hours in the day. We may miss true beauty and opportunity if we think this way. Jim lived a hard and fast life, though he paused to make beautiful music and poetry. It may be, though, for the conflicted artist, that he had no choice but to create his work. Many interesting people feel this way, that they have no choice in there lives and that they were born to do certain things in their lives. Some are luckier than others to be enlightened to their life’s purpose early on. Others, like myself, must wait patiently for that moment of understanding and the sense of serenity and purpose that comes with our life’s work being laid out in front of us. I think that many people are rushed to get to that moment of knowing what to do with our lives and we may be so eager that we miss the moment. There is also another distinct possibility for all of us, who are patiently or not so patiently waiting for our purpose to present itself. This may be as it may have been for Jim, that our purpose in life is to deal with the extreme nature of the human condition. This is a certain fear for me, as I know it is for others. We may have to go down a path of misery. What then? Will we manage to do this in a way of sobriety? There are so many questions and the more we know about others and our world, the more we question ourselves. We may feel ready to tackle our own selves and our own fears, but what if we fear ourselves and our ability to carry out the plans that the most confusing universe has set out in front of us? I believe that Jim Morrison was made more confused in his life by the more he learned and that we must not be afraid of the questions. I think that even more, we must not be afraid of the answers. What we must do is realize that there will come a time before our own deaths to relax and that is when we are satisfied that we did ask all the right questions and that we did our due diligence to find all the answers. I must close by saying that reviewing the life of Jim Morrison has been interesting and personally fulfilling. Any intelligent and creative person’s life is useful to explore, especially a life that is cut short by an untimely death. What we could have become in our own lives is magnified by what others could have been if they had lives to see it. In this way, it is essential to live life to the fullest and act as if we are constantly writing our own biography. We must be careful in what we do and we must be patient, but we cannot be so careful as to miss out on the joy of pushing the limits of our own lives and of our surroundings. We must all trust ourselves enough to do this and we will be most surprised once we do and we begin to trust and respect all those that came before us and all those that will pass behind us in our lives. Works Cited C Cristafulli, The Doors When The Music’s Over: The Stories Behind Every Song, 2000, New York, NY: Thunder’s Mouth. Kirijasto, â€Å"James Douglas ’Jim’ Morrison†, 2000, Accessible Online http://kirjasto. sci. fi/morrison. htm, last accessed 2 March, 2009.

Safety Management A Priority For Aviation Operation

1- Introduction Safety management is simply applying principles, framework, processes and measures to prevent accidents, injuries and reduce the risk. It is that system which exists to help managers in better accomplishing their responsibilities for operations that design through either the prediction of system’s failures before errors occur or the identification and correction of system’s failures and errors by analyzing safety occurrences. The safety management has to be supported the top management; it must be a priority for aviation operation. (1) SMS provide a set of practices, procedures and beliefs that will mitigated and monitor safety risks. 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Hence we observe that there is no single definition for ageing of an aircraft or a definition thatRead MoreInterventions and Policies for Airline Accident Prevention1804 Words   |  7 Pagesincidents (safety occurrences) is being replaced with a more systematic and selective process. As aircraft technology and systems development becomes more advanc ed, air travel perceived as safer and as such, the role of investigating agencies has evolved. A number of air safety investigation agencies have policies to help determine their level of response to occurrences by considering a range of factors such as the severity of the event, the category of aircraft involved, class of operation and public

Pride And Prejudice By Jane Austen - 2107 Words

‘Pride and Prejudice’ and ‘Wuthering Heights’ are seen as being mainly concerned with social class and the wealth of those who are in the upper class but readers must consider other themes the novels are concerned with. In Jane Austen’s 1813 novel ‘Pride and Prejudice’, the opening line of the novel; â€Å"a single man in possession of a good fortune must be in want of a good wife sets the tone for the aftermath of the novel, addressing the fixation of wealth and the benefit of money. Wealth can be seen as being there for social progression in the Nineteenth-Century English society. Through the use of the imperative verb â€Å"must†, Austen is emphasising on the fact that within society to have a â€Å"good wife† is an order. In contrast, it is revealed in the novel that a single man marries those who are in his class, whereas women want to marry those who are above their class. Contextually, men in Nineteenth Century England were considered to be marrying those who were daughters of a gentleman as their fathers had wealth of their own. From this, it can be inferred that social adjustment is seen as being the ultimate goal for the characters of ‘Pride and Pre judice’. This can be referenced in Bronte’s Wuthering Heights by he will be rich, and I shall like to be the greatest woman of the neighbourhood, and I shall be proud of having such a husband. This illustrates that Catherine is marrying Edgar for the wealth he owns and his status but this can be seen as being a social norm inShow MoreRelatedPride And Prejudice By Jane Austen Essay1724 Words   |  7 PagesThe 18th century novel, Pride and Prejudice, by Jane Austen, is a fascinating book about a young woman’s struggle with family and love. 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The Horror that is Animal Testing - 970 Words

When you go to your local pharmacy and pick up medicine, do you know what animals have gone through to get it on the shelves? It is something we’ll never have to imagine going through, so why should animals? Animal testing is not necessary. Animals simply don’t have a choice if they want to be experimentd on. What makes me angry, is there are alternative methods to testing, so animals don’t need to suffer. Animals have to endure terrible pain, fear, and loneliness, which is cruel and mean on our part. The pros and cons to testing don’t even out. Cleary, animal testing needs to be put to a halting stop. Animals and humans are very much alike. Infact, this is one of the reasons we test on them, because our bodies are very similar. Animals and humans share emotions, including sadness, happiness, and fear. As much alike as we are, there are things that set us apart. One being that they are treated much more poorly than humans. Just because they don’t have rights, doesn’t mean it is acceptable to test on them . â€Å"The question is not, Can they reason? nor, Can they talk? but Can they suffer?† Jeremy Bentham states, perhaps with an opinion that animals can feel the same emotions as humans. I agree with this statement, knowing that animals also have a heart.The simple fact they cannot talk should not determine their fate. Imagine the roles reversed. You are the animals, and they are human.You don’t have a say in what you can and can’t do. In addition, you areShow MoreRelatedHorrors of Animal Testing Essay657 Words   |  3 PagesAnimal testing for human safety is inhumane and must be banned. Beloved house pets such as rodents, rabbits and even dogs are being tested on all over the world. These powerless and voiceless animals are intentionally given dreadful diseases to find cures while scientists could be finding alternative ways of testing instead of using our furry friends. 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Interplanetary Internet from NASA’s experiment Free Essays

ABSTRACT Internet has already revolutionized the way we live and work, but it is still in its infancy in some areas to provide ubiquitous connectivity in future. To solve the problem of Ubiquitous connectivity in communication – challenged areas Delay Tolerant Network (DTN) provides an opportunistic networking architecture. Opportunistic networks represent a class of networks where end-to-end continuous connectivity between source and destination is intermittent [1]. We will write a custom essay sample on Interplanetary Internet from NASA’s experiment or any similar topic only for you Order Now There are variety of challenged areas like areas as high latitudes, war prone areas or disastrous scenario where environmental considerations create impossibility for conventional mobile telephony and satellite coverage is inadequate or economically infeasible or because of infrastructure deployment constraints, or power source availability, or because of government policy decisions do not allow access. Moreover, DTN seeks to address the technical issues in heterogeneous networks to use every possible feasible access method to provide internetworking among existing types of wireless or wired networks like Internet, Mobile and WLAN [7]. Integrating DTN capabilities with the existing TCP/IP based Internet it aims to deliver Internet-like communications even for long variable delay, asynchronous as well as interrupted heterogeneous environment where existing transport protocol and congestion control mechanism have limitations [1]. Basic DTN architecture by IETF RFC involves use of ‘Bundle protocol’ which allows communication over multiple hops by means of ‘custody transfers’ andmessages in DTN are routed in store-and-forward manner on each node[2]. Research and development going on over last ten years has set out some challenges that need more focus before DTN becomes a day to day reality. In this Interim report I am focusing on Denial of Service (DoS) attacks due to open channel and multi-hop DTN transmission characteristics which can limit its full utilisation. First I will review the state-of-art in context of DTN security and attacks at present then I will analyse possible DoS attacks in DTN and their countermeasures. I will present a comprehensive resilience mechanism to address the identified attacks, focusing on a critical metrics of performance. I will propose a simulation model and demonstrate the effectiveness of the newly proposed techniques through simulation using ONE simulator. CHAPTER 1: Introduction 1.1 Background and Context The emergence of the idea of Delay tolerant networking started in late 1990 as ‘Interplanetary Internet’ from NASA’s experiment of deep space, high delay, store-and- forward networks [5]. That early work focused on protocols suitable for very long propagation delays of deep- space- interplanetary communications. Other early work includes military specific Disruption-Tolerant Networking due to scenarios of long delayed links, broken or intermittent links. Extending initial work purpose in 2002-03 researchers looked at other applicable scenarios, like terrestrial wireless networks, wireless sensor networks and other local area networks, where communication opportunities were not much certain. DTN has shown its suitability and strength to applications having long or unknown delays due to frequent disconnections and for interconnecting various heterogeneous networks, which commonly is not a conventional IP-based network. The development of wireless communication technologies made the Internet ubiquitously. Within the vision of ‘any time anywhere’ networking, efficient internetworking among existing types of wireless networks is inevitable. Integrating DTN networks as another access method into the existing network infrastructure allows the Internet to reach people who are hundreds of kilometres, or more away from existing infrastructure. Although Internet has already revolutionized the way we live and work, but it is still in its infancy in some areas. Challenges faced by current Internet Today’s Internet is based on end-to-end network connectivity based TCP/IP protocol model. It makes certain fundamental assumptions like continuous source destination connectivity, end – to- end low delay paths, low transmission error rate and bidirectional symmetrical data rate which applies a number of constraints to its reachability[1][5]. So the overall vision [6] of Future Internet should be to provide ubiquitous and pervasive networking for the users and applications in well-connected regions with keeping in mind communication challenged areas. The current Internet must develop to be more able of dealing with new evolving forms of content and their consumption but there are many challenges in the wide range of application requirements related to network heterogeneity as well as by the growing number of non-TCP/IP networks and mobile devices. 1.2 Motivation to DTN: 1.2.1 Challenged networks/environments for Internet Some regions are called ?communications challenged’ because they have little or negligible infrastructure that is required to support modern wireless and wired Internet communications. These Challenged environments are very heterogeneous and have characteristics [1] [5] such as End-to-end path may not exist creating Intermittent connectivity Node reachability and density may be Predictable (Planetary dynamics, scheduled vehicles, message ferries) Unpredictable (Sparse sensor networks, data mules, vehicular) Semi-predictable (animals, vehicles, etc.) Large, unpredictable, variable delays for transmission (deep space- moon: 3s, Mars: 2min, Pluto: 5h) Asymmetric/ asynchronous data rate which may be very low (acoustic underwater modems: 1 bit/s–few Kbit/s) High bit error rate (wireless, underwater, satellite) Using different transport protocols in different parts of the network making interactive communication impossible/ inefficient or unreliable Environment having very large round trip times (deep space, military or remote area communication) Many of the challenges have been tried to address using Performance Enhancing Proxies (PEPs) which try to solve high delay low bit rate links performance but it still demands end-to-end connection. 1.2.2 Challenges due to Mobility Mobility may create potential disconnection in end-to-end connectivity which produces challenges for current TCP/IP based Internet in form of: Communication link availability (not ubiquitous due to movement Limited Transmission range Communication link specially interactive communication link may be costly due to frequent movement of nodes Link may be unavailable due lack of battery power or storage Although Ad-hoc and Peer-to-Peer networks may solve the problem to some extend but there are limitations due to not enough mobile nodes available or willing nodes or nodes with incompatible devices. 1.3 DTN concept: Solution to Challenged environments and mobility DTN aims to provide solution for challenged environment where no end- to-end connection is available or it is disrupted. Delay Tolerant Network is a network over underlying heterogeneous networks having opportunistic encounter driven ‘store, carry and forward’ approach to provide connectivity on hop-by-hop basis. Most discussedcurrent approach to DTN is centred on an overlay protocol called the bundle protocol (BP).[11] 2.4 DTN Denial of service attack (DoS): Motivations DTN transmission is open channel and multi-hop which makes attacks in such situations an easier task. Traditional mechanisms to mitigate these attacks are not well sufficient to challenge environments where nodes are not connected for long periods of time and direct end-to-end communication is not possible and resources are scarce. Most of the solution available so far in literature address security in general and does not give attention to Denial of Service aspects in DTN. DoS is the most common attack in Internet communication and in DTN environments due to longer delays DoS attempts will be more effective. So there is need for more research explicitly considering DoS at all times. 1.5 Objectives of Project Study of delay tolerant network (DTN) architecture, its concepts and Bundle layer and how they differ from current networks, giving more emphases on security and attacks. First I will review the state-of-art in context of DTN security and attacks at present then I will analyse possible. Identify the common DoS attacks and their countermeasures, focussing on a scenario of communication in delay tolerant networks comprising mobile nodes. To design develop and test some resilience mechanism mechanism to address the identified attacks (nodes with address spoofing, false authentication and packet flooding), focusing on a critical metrics of performance using Simulator Simulation result will show how performance of a DTN network suffers when no Resilience scheme is used. 1.6 Overview of Dissertation: First I will review the state-of-art literature review in context of DTN architecture, security and analyse possible DoS attacks in DTN and their countermeasures. Then (in Ch-3) I will present an attack model and resilience mechanism for DoS attack. In next sections will follow ONE simulator overview and future work in direction of achieving objectives of project with Gantt chart and finally conclusion and references. CHAPTER 2: State-of-The-Art and Literature Review 2.1 Introduction DTN aims to provide usable Internet-way communications for long variable delays, asynchronous as well as interrupted heterogeneous environment where existing transport protocol and congestion control mechanism have limitations [1]. 2.2 Delay Tolerant Network history and Overview Delay Tolerant Networks (DTNs) have become a hot research topic among researchers and academicians since it was proposed by Kevin Fall in 2003 SIGCOMM seminar paper [1]. Vinton Cerf who is recognized as â€Å"one of the fathers of Internet† contributed in designing and defining its reference Architecture [2] in DTNRG for IETFdraft of RFC-4838. Basic DTN architecture by Internet Research Task Force’s Delay-Tolerant Networking Research Group (IRTF DTNRG) involves use of ‘Bundle protocol’ which allows communication over multiple hops by means of ‘custody transfers’ andmessages in DTN are routed in store-and-forward manner on each node[RFC-5050]. 2.3 Delay Tolerant Networking Definition and Contexts of DTNs in Literature A delay- or disruption-tolerant network has been defined in several ways in literature. In [1], the DTN is defined as challenged networks, which may not follow the assumptions of the Internet. In [2]RFC-4838 describes it as occasionally and opportunistically -connected networks that may comprise more than one different set of protocols. It includes a hop-by-hop transfer of message for reliable delivery. A DTN as stated in [5] was defined as a network of regional networks, where it serves as a store-and-forward overlay on top of (and providing interoperability between) regional networks (Internet, the MANETs, sensor network or any other network). 2.4 Constraints in Delay Tolerant Networks Node Constraints includes (a) Limited Memory (b) Limited and unreliable Power and Energy (c) limited transfer time for messages. Network Constraints are (a) Unreliable Communication (b) Collisions and latency Physical Limitations are (a) Unattended after deployment (b) Remotely managed Link constraints (a) long and varying delays (b) changeable mobility pattern of devices In Opportunistic networks such as Sensor/Actuator networks that use scheduled intermittent connectivity (to conserve power), because they have extremely limited node power, storage memory, and CPU processing capability. In Vehicular networks which use opportunistic (unpredictable) contact for message delivery. In Satellite networks having medium delays or periodic connectivity In Terrestrial wireless networks that connect mobile devices, including PDAs etc. In Underwater acoustic (sensor) networks having frequent interruptions with moderate delays. Outer (deep)-space networks (InterPlaNetary (IPN) Internet project). Military Ad-hoc Networks such as a military battlefield where systems operate in highly hostile environments having mobility, bad environmental factors, or regulations causing disconnections like intentional jamming. In Rural villages or developing regions low cost and remotely located networks that non-interactively and occasionally communicate with the Internet. For example remotely located schools, kiosks and computer centres are linked on occasional basis using satellite and data mules or local transport infrastructures. In sparsely connected ad hoc networks where some wireless devices or networks may fall outside the required communication range of each other. 2.5 Major DTN Applications and Examples Example of Projects involving DTN: [6,7] Diesel net. Haggle, Interplanetary Internet, BBN’s SPINDLE project, FirstMileSolutions SeNDT – Sensor Network with Delay Tolerance, Saratoga and HTTP-DTN, SNC Project, N4C Project, ZebraNet, FidoNet, SUMOWIN, Shared Wireless Infostation Model (SWIM) at Cornell, The Mindstream Project at the University of Waterloo School of Computer Science, Time Equals Knowledge (TeK),World Wide Web Offline Explorer (WWWOFFLE), Bytewala DTN, Chianti, IBR-DTN etc. 2.6 Routing in DTN ** Traditional routing protocols operate under the assumptions of continuous connectivity, low delay and very low packet loss rate but in case of DTN opportunistic and disconnected links new routing protocols and system architectures are required to be developed. There are various types of DTNs based on their characteristics, but allows great flexibility for routing protocols in these networks based on their specific requirements. There are several DTN routing schemes proposed in the literature. Four major ones could be Epidemic routing: Epidemic routing simply makes multiple copies of packets to flood the network in a hope that any one of them will be delivered to the destination. This protocol performs best in terms of packet delivery and latency when network bandwidth and storage are unlimited. But it is not the case in practice. PROPHET: estimates delivery predictability to destinations using the history of encounters. MaxProp: computes a rank for each packet in terms of delivery probability and sorts packets in the transfer buffer accordingly. Upon transfer opportunity, packets are replicated in the order of their ranks Spray-and-Wait: follows a flooding scheme, but limits the total number of copies per packet. 2.6 Threats in DTN To understand the topic I will first examine the terminology, then the definitions of threats and DoS followed by discussion why DoS is potential problem in DTN. Security and attack literature reviews are given in next chapter. Threat: [20] Any circumstance or event (such as the existence of an attacker and vulnerabilities) with the potential to adversely impact a system through a security. Attack: Attempt to gain unauthorized access to a service, resource, or information, or the attempt to compromise integrity, availability, or confidentiality. It is irrelevant to success, which may or may not. Non DTN node threats: The first set of threats considered were those coming from network elements which are not directly part of the DTN. As an overlay network, bundles typically traverse multiple underlying networks. Any vulnerability in the bundle protocol can be exploited at any of those network elements [13]. Denial of Service (DoS): Classically, the definition of denial-of-service (DOS) involves three components: authorized users, a shared service, and a maximum waiting time [20][13]. In DoS Authorized users are said to deny service to other authorized users when they prevent access to or use of a shared service for longer than some maximum waiting time. More generally to denial-of-service in DTN: The result of any action that prevents any part of a DTN from functioning correctly or in a timely manner so that intended user cannot use it. It is directly a breach to availability [20]. 2.7 Denial of Service Attacks: [3]In addition to the basic resource consumption threats mentioned above there is also a range of denial of service (DoS) attacks which must be considered in the DTN context. DoS attacks can be mounted at any layer, from physical to application. In a DTN environment, the generally longer latencies involved will probably act to make DoS attempts more effective. As with all networks, security mechanisms will themselves create new DoS opportunities. Therefore whatever services and mechanisms are defined for DTN security should explicitly consider DoS. For example, mechanisms which involve certificate status checking (via some protocol to a key) based on received messages create new DoS opportunities since such lookups consume resources on both the receiving node and the key server. Common DoS attacks: Attacks that are common to DTNs are Dropping of packets, Flooding the network with unnecessary spurious packets, Spoofing a different node’s address to intercept all the packets destined to that node, orrupting routing states and Counterfeiting network acknowledgments Resource consumption (Battery exhaustion, creating routing loops) 2.8 Resource consumption Due to the resource-scarcity that characterizes DTNs, unauthorized access and use of DTN resources is a serious concern. Specifically, the following can consume DTN resources and be considered threats against a DTN infrastructure [13]: 1. Access by unauthorized entities, 2. Unauthorized applications controlling the DTN infrastructure, 3. Authorized applications sending bundles at a rate or class of service for which they lack permission. 4. Unauthorised bundle content modification -tempering 5. Compromised network elements, be they DTN nodes or not. In addition to these threats, DTN nodes can act to assist or amplifysuch resource consuming behaviour as follows: Forwarding bundles that were not sent by authorized DTN nodes. Generating reports not originally requested (e.g. if a bundle has been modified) Not detecting unplanned replays or other misbehaviours. DoS prevention: As described above, denial-of-service is a breach of the security characteristic of availability. Along with availability, confidentiality and integrity are the primary concerns of security. DoS cannot be prevented because most attacks leverage the use of routing and other network activity but there are countermeasures to mitigate it like: Spread spectrum techniques (using network coding) Proper authentication using either Public-key cryptography (computationally expensive) or Fast symmetric-key cryptography must be used sparingly Currently work has been done using Identity based cryptography (IBC) or Hierarchical based cryptography (HIBC). DTN Security Requirements: [5] According to DTNRG The emphasis of DTN security is on protecting the DTN infrastructure from unauthorized access and use Prevent access by unauthorized applications, Prevent unauthorized applications from asserting control over the DTN infrastructure, Prevent authorized applications from sending bundles at a rate or class of service for which they lack permission, Promptly detect and discard bundles that were not sent by authorized users, (early detection within infrastructure rather than at destination), Promptly detect and discard bundles whose headers have been modified Promptly detect and disable compromised entities Secondary emphasis is on providing optional end-to-end security services to bundle applications. CHAPTER 3: My proposed approach to DOS in DTN 3.1 Introduction In this section I summarise my analysis of previous work done in the areas of security and attacks in DTN, especially Denial of Service in DTN. Also I identify conditions that are can materialise an attack materialise. Then I show that based on these conditions the attack effectively happening in a representative model, with a set number of nodes and chosen network topology, routing schemes and security scheme. I also demonstrate that security and privacy are crucial in DTN and using cryptographic techniques we can secure DTN. I assert that because of constrained nature of DTN, participants have limited access to Trusted Authority. In view of these constraints, I propose a model based on a symmetric and asymmetric key cryptography to mitigate DOS attacks in DTN. My model is based on prior creation and distribution of keys to participants at setup stage, where each trusted participant knows keys of others. 3.1 Scenario My scenario is based on IETF DNRG architecture on Delay tolerant network. There are multiple operating groups in this DTN. Each group has its own trusted and well known registering agency/organisation which can work as an affiliation agency or service provider. These could be any mobile service provider or any company which will register its employees and knows them prior or any university/school/hospitals which can register members by verifying their identity and credentials. This means that members of this group are now trusted and known and are not malicious. With this set up we have limited authenticated participant nodes and we can avoid any malicious activity by unknown/ untrusted nodes. Such network is a special DTN and can also be useful for example in a conflict zone where participation by anonymous nodes is not desired. I consider a scenario in which these mutually trusted DTN mobile nodes exchange messages within its group (using PDA/Bluetooth devices/mobile phones) with one another after authentication phase is successful. Fig1: Used Scnario 3.2 Background/Review of Security and DOS in DTN In Literature Here I will discuss solutions and reviews based on literature survey on DTN security and DOS attacks. There is a particular lack of research papers addressing DOS attacks in DTN. Most work is based on assuming that routing or security mechanism of DTN will prevent DOS to some extent. Nevertheless these schemes can never underlie the necessity of authentication protocols. Farrell and Cahill [11] review the current state of DTN security work inspired by Internet. They identify and analyse threats for DTN and the security requirements in bundle protocol. Then they discuss open issues in bundle security and implementation issues in DTN security as follows. (1.) First set of threats are from outside network due to being overlay nature of DTN. (2.) modification of messages or bundles in transit for malicious purposes. (3.) Unauthorized use of scarce DTN resources like replay attacks and (4.) denial of service which can be mounted on any network layer, and (5.) confidentiality and integrity threats like changing the destination in bundle. The author propose for DOS that firstly using random values instead of counters for identifying messages will make it hard to guess valid message content. Secondly, accepting only fresh authenticated messages and dropping all others will be advantageous in mitigating attacks. Thirdly, authors point that networks and security protocols themselves can create new DOS if not carefully designed. I am building on the second concept in my proposal i.e. exchange message after successful authentication. Moreover, Farrell and Cahill [11] propose that security architecture is needed in which security services can be provided both on hop-by-hop and end-to-end basis, and additionally between two intermediary nodes in the middle of a route. They also mention that several open issues remain in DTN security like the implementation cost and level of complexity should not rise too high, since typically complicated solutions are not secure in practice. Another big open issue is key management [11][12] briefly addresses security services on an end-to-end basis (e.g. confidentiality and DoS), but does not go into specifics nor considers the case of initial communication between two nodes without any prior security context. [13]The Delay Tolerant Networking Research Group (IRTF-DTNRG) has produced an Internet draft for bundle security protocol specification [12] and an additional draft [13] explaining the security overview and design choices made in the specification. The draft which is near completion describes security headers that can be added to bundles to provide different security services. Security Blocks in Bundle security Specification: According to RFC draft [13] there are four types of security block that can be included in a bundle. These are the (1.)Bundle Authentication Block (BAB), (2.) Payload Integrity Block (PIB), (3.) Payload Confidentiality Block (PCB) and (4.) Extension Security Block (ESB). The BAB is used to assure the authenticity and integrity of the bundle along a single hop from forwarder to intermediate receiver. The PIB is used to assure the authenticity and integrity of the payload from the PIB security-source, which creates the PIB, to the PIB security-destination, which verifies the PIB authenticator. The PCB indicates that the payload has been encrypted, in whole or in part, at the PCB security-source in order to protect the bundle content while in transit to the PCB security-destination. PIB and PCB protect the payload. The ESB provides security for non-payload blocks in a bundle. ESB therefore is not applied to PIB or PCBs, and of course is not appropriate for either the payload block or primary block. Extension Blocks Bundle Payload Primary Blocks (Time Stamp, Life Span, Flags, Source EID, Destination EID, Report to EID, Custodian EID) Security Blocks (optional) BAB, PIB, PCB, ESB Each security block contains source and destination information and a cipher-suite defines the algorithms that should be used to process the received security headers. The security-sender and the cipher-suite information together determine the choice of keys. Different combinations of these four security headers can be used simultaneously. The need to authenticate bundles using Security blocks is very useful to protect against denial-of service (DOS) attacks against a bundle agent’s resources, but need more insight knowledge how to implement it. In [14], [15] (Seth and Kate) authors discuss the challenges of providing secure communication (i.e., confidentiality) in DTN and suggest employing Identity-Based Encryption (IBE) to let a source derive the destination public key from some associated identity string, e.g., an e-mail address. In [14] Seth et al. discuss in detail about rural area DTN and shows that traditional mechanisms including a combination of Public Key Infrastructure (PKI) and certificates issued by trusted third party are not suitable for DTN. They develop a security mechanism for DTN using Hierarchical Identity-Based Cryptography (HIBC) for creating secure channels, providing mutual authentication, and key revocation. [15] Kate et al. uses identity based cryptography (IBC) for source authentication and anonymous communication as well as message confidentiality are provided using IBC. Its main idea is to make an entity’s public key directly derivable from its publicly known identity information such as e-mail address. Eliminating the need for public-key certificates and their management makes IBC much more appealing for securing DTNs, where the need to transmit and check certificates has been identified as a significant limitation. I note that the existing techniques to secure DTNs are aimed to provide data confidentiality and authentication only. In [16] Burgess et al. suggested that some Delay tolerant networks coupled with replication-based routing protocols are intrinsically fault tolerant even without authentication mechanisms. They compare four different routing algorithms (MaxProp and its three variants) against four different attack models: dropping of packets, flooding of packets, routing table falsification and counterfeiting delivery acknowledgments. They distinguish between two types of attack; weak and strong attacks on the basis of prior knowledge of DTN scenario. One of the major themes in the paper is the two-fold benefit of epidemic-style packet dissemination in DTN routing which improves packet delivery rates and greater attack tolerance. However, this paper does not provide any attack specific simulation. In [22] authors poses the question of the necessity of authentication or the level of authentication required especially since authentication imposes overhead. Without authentication, the number of nodes willing to join the network may actually increase due to the easier deployment, resulting in better overall performance. They identify conditions for an attack and present an attack based on a combination of targeted flooding and acknowledgement counterfeiting. They suggested that generally, attacks become increasingly effective when the minimum hop count required increases. Coclusion: Identity-based cryptography requires a global trusted third party to guarantee for new nodes entering the network (by generating the necessary private keys). But IBC is no better than traditional PKI in terms of authentication and only a little better than traditional PKI in terms of encryption since network connectivity is not necessarily needed at the time of reception and decryption. In [17] authors propose a scheme that gives confidentiality and authentication to messages leveraging social contact information and past present affiliation of peers. Author evaluates the proposed scheme by analysing real-world social network data of Facebook, simulating communication scenarios, and through an informal security analysis. In [18] authors focus on DOS and describe few possible DOS attacks for DTN and propose a token based mechanism against those attacks. Authors suggest attack depends on routing protocol. Therefore, it is obvious that the routing protocol that maintains routing table like in-node states can be subject to severe DOS attacks. Spray-and-wait protocol is a stateless protocol in that nodes do not maintain any routing states; instead a tiny state is kept in each packet header. Their first approach is very trivial but second approach based on Token utilising collision count with every peer node provides countermeasures against spoofing and packet dropping in a limited scenario. There are many drawbacks in this approach for example an honest node always meets the same malicious node spoofing the same address and that honest node never meets with the actual address holder or any other adversary spoofing that address. In this case the honest node does not suspect this peer to be an adversary a nd always follows basic Spray and will transfer message to malicious node. In [19] A. Wood very broadly discusses about DOS attack taxonomy to identify the attacker, his capabilities, and the target of the attack, vulnerabilities used, and the end result. Although, author surveys vulnerabilities and give possible defences in Wireless sensor network some of which issues are useful in gaining insight of DOS attacks in DTN. According to author denial-of-service is the result of any action that prevents any part of a network from functioning correctly or in a timely manner. It is directly a breach to availability. In [2s0] authors also use Identity based cryptography to investigate how security in DTNs can be bootstrapped and present an improved scheme for authentication of fragments. We show that DTN with replicative routing protocols are not necessarily robust under known denial of service attacks if there are no authentication mechanism in place. Under many networking settings and mobility patterns, carefully designed attacks based on well-known techniques can cause considerable performance degradation. They investigate the attack effectiveness under various settings and identify properties of the networking environment that attribute to the vulnerability of the network. They observed that routing protocols which globally floods routing metadata to guide routing decisions are more susceptible to attacks as the routing metadata can be easily spoofed. They also observed that the minimum hop count required for packet delivery plays an important role. 3.3 Attack Model My objective is to determine how performance of a DTN network suffers when no authentication scheme is used. This also depends on other variables set aside in assumptions about the security model and what attacks I want to consider. By recognise that these little variations can cause DTN to perform badly even in the presence of few attackers, for example in case of extremely low mobility of nodes and one node positions itself at a crucial location along the routing path. If that node misbehaves, by dropping or flooding bundles, DTN will perform miserably at least along that routing path. I have chosen a hop by hop authentication model where main aim of adversary nodes is to create DOS by preventing the successful delivery of packets to their intended destinations. The adversary nodes can join together to launch a coordinated attack or a standalone adversary node can perform an opportunistic attack. 3.4 Authentication Without authentication no estimation can be formed about the identities of nodes and therefore the intentions of peers can be determined. In traditional TCP/IP, data frames are transmitted to all other nodes on a network. Each receiving node checks the destination address of each frame, and simply ignores any frame not addressed to its own MAC. Because it is a local broadcast domain, MAC address spoofing is fairly easy. Attackers can spoof address of any node and can become any node at any time including the destination node of the bundle. 3.5 Routing Model While routing is important consideration and routing data exchange between nodes is an important factor, the need for peer to peer and end to end authentication cannot be precluded. In my model I am ignoring any attacks based on routing data exchange and also at application layer such as spoofing requests that floods legitimate nodes to flood each other with unneeded traffic. 3.6 Mobility Model An attacker’s mobility can be variable. It can attack all nodes that come within its transmission range or it can choose to remain in the vicinity of one node in the network for extended periods. Tailgating is also possible. [6] Burgess et al call the latter approach a parasite attack – the most effective use of the attacker’s resources. 3.7 Attack types In the above situation DOS attacks are possible by misbehaving nodes. I am considering the following two: Packet Dropping: An adversary node does not replicate, forward or store a packet that is received from its peer. These nodes act like black holes in the network and impair packet propagation in the network, although routing choices such as Spray provide some resilience to such attacks, because additional copies of packets might exist at other locations. Address Spoofing: An adversary fakes the some other node’s address when it encounters another node in the network. An unsuspecting node sends packets to this malicious node and removes packets from its queue. The unsuspecting node might also delete the packet after delivery. If the malicious node receives packets with a high replication count, the successful delivery of such packets becomes highly unlikely. Spoofing created more problems in the network than dropping with respect to packet delivery. An attacker can also perform both types of attacks simultaneously. 3.8 Assumptions In this section I describe assumptions for my proposed resilience mechanism to prevent DOS attacks in DTN. I’m considering two schemes; one based on pre shared symmetric keys and other based on public key cryptography. There is a Trusted Authority is assumed not to be compromised and nodes can only be registered by proving their credentials. Registration Authority can be any service providing company or any local company or government organisation. Also malicious nodes cannot be registered and registered nodes are not malicious. Each node has a unique ID and I assume that all group nodes have enough power and storage capability to perform cryptographic operations. For pre pre-shared keys scheme, each node at registration phase is given a group key, which it uses for authenticating other nodes. For public key cryptography based scheme, each node is given a public- private key pair at registration phase. Also, each node maintains a table of every other node in the group and their public keys. This table is provided at registration phase. 3.9 Proposed Resilience Mechanism My proposed schemes are based on creating a mutually trusting network of nodes. Spoofing nodes cannot utilise this network because they cannot pass authentication checks. a) Scheme based on pre-shared group key: The communicating nodes thwart potential DOS attacks of packet flooding by malicious sender and packet dropping by malicious receiver. Nodes authenticate each other before sending packets. The intention is to find if a peer is spoofing someone’s address. This is done as follows. Two nodes N1 and N2 are part of the group, which shares the group key G that they received at registration phase and wants to authenticate each other. Node N1 generates a random token RN1 and encrypts is with the group key G and sends the encrypted message G[RN1] to N2 Node N2 decrypts G[RN1] with G and sends result G’[G[RN1]] to N2 Node N1 checks whether RN1 is equal to G’[G[RN1]], if mismatch, N1 terminates further communication, otherwise proceed to next steps Node N2 generates a random token RN2 and encrypts is with the group key G and sends the encrypted message G[RN2] to N1 Node N1 decrypts G[RN2] with G and sends result G’[G[RN2]] to N2 Node N2 checks whether RN2 is equal to G’[G[RN2]], if mismatch, N2 terminates further communication, otherwise proceed to next steps N1 and N2 exchanges message. The drawback of this scheme is if pre-shared group key is compromised a malicious node can spoof any other node and coordinated attacks can be very disastrous. b) Scheme based on public key cryptography: In this scheme each trusted node maintains a table of other nodes and their public keys. This list is originally provided by Trusted Authority and refreshed when subject node comes in contact with Trusted Authority opportunistically or at scheduled times. The communicating nodes authenticate each other based on each other’s public keys before sending packets. This is done as follows. Two nodes N1 and N2 are part of the group, with each having their public private key pair [NiPub, NiPvt] received at registration phase. N1 generates a random Token RN1 N1 creates encrypted Token N2pub[RN1] Using shared N2’s public key and sends to N2 N2 decrypts N2pub[RN1] using its private key and responds with N2pvt[N2pub[RN1]] N1 checks whether N2pvt[N2pub[RN1]] is equal to RN1. If mismatch, N1 terminates further communication, otherwise proceed to next steps N2 generates a random Token RN2 N2 creates encrypted Token N1pub[RN2] Using shared N1’s public key and sends to N1 N1 decrypts N1pub[RN2] using its private key and responds with N1pvt[N1pub[RN2]] N2 checks whether N1pvt[N1pub[RN2]] is equal to RN2. If mismatch, N2 terminates further communication, otherwise proceed to next steps N1 and N2 exchanges message. In both of these schemes one node needs to know if the bundle originates from a trusted community in order to prevent flooding attack by a malicious node and the bundle is sent to a trustworthy node in order to prevent packed dropping If a malicious node spoofs some other node’s address, it cannot decrypt the encrypted random token it received from its peer. Analysis of Proposed Mechanism: I have chosen the above mutual authentication schemes as a mechanism to prevent DOS attacks on DTN because this is a reliable way to identify malicious nodes and prevent packet flooding by rejecting packets from untrusted nodes and also prevent the risk of packet dropping by not sending packets to untrusted nodes. If a malicious node tries to send junk packets to legitimate nodes, the packets can be discarded at first contact with a legitimate node because a malicious node cannot authenticate itself to the network without pre-shared group key or public-private keys issued by Trusted Authority. There is a need to address current distribution of security information among nodes. This will involve key management and revocation issues. But this is part of more general DTN configuration management solution. 3.10 Simulation model and parameters Result Matrices: The simulation results will show that packet delivery rate decreases significantly in the presence of malicious nodes, i.e., packet droppers and/or address spoofers. The results will also show that delivery rate is increased with our countermeasures. In addition to that, I will also measure the overheads caused by the countermeasures in terms of number of copies of a single packet. One Simulator (used for simulation) The Opportunistic Networking Environment (ONE) simulator has been specially designed for evaluating DTN routing and application protocols. It is written in JAVA. It provides Generation of node movement using different movement models e.g. 1. Random Movement 2. Map based Random Movement 3. Human behaviour Based Movement Routing messages between nodes with various DTN routing algorithms and sender and receiver types. Visualizing both mobility and message passing in real time in its graphical user interface. I have run some scenarios and already Implement protocols in ONE like 1.) MaxProp 2.)Direct Delivery, 3.) Epidemic, 4.) First Contact, 5.) PROPHET 6.) Spray and Wait I have tried to read and understand Code of different classes, I have configured ONE using Eclipse Work done Fig: Screen shot of scenario One simulator test runs Five test runs were done on One Simulator using default epidemic routing with varying number of nodes from 60 to 180 in steps of 30. Some of the results are captured in the table below Nodes60 90 120 150 180 sim_time165 374 541 780 1096 delivered288 292 313 300 299 delivery_prob0.3876 0.3914 0.4196 0.4032 0.4024 hopcount_avg20.7396 15.2705 17.7636 15.12 12.9398 Future work I have chosen mutual authentication as a means to prevent DOS attacks because current implementation of DTN does not yet completely address the problem of address spoofing and packet dropping. Without the aid of some form of authentication either at node level or bundle level, it is difficult to discern malicious nodes. The bundle security protocol draft introduces four new security blocks in Bundle architecture (BAB, PIB) and their purposes. These blocks can be used to implement existing cryptographic techniques to provide some robust resilience against DOS and other common attacks in DTN. However this will involve development of reliable cipher suites and cryptosystems and this is an area of continued research. My further work will be mainly focused in the area of Bundle security specification. CHAPTER 4: Conclusion 4.1 Project Work Plan 5: References [1]K. Fall, â€Å"A Delay-Tolerant Network Architecture for Challenged Internets,† SIGCOMM, August 2003. [2]Vinton Cerf, Scott Burleigh, Adrian Hooke, Leigh Torgerson, Robert Durst, Keith Scott, Kevin Fall, and Howard Weis, Delay-tolerant network architecture. DTNRG Internet Draft, March 2003 and IETF RFC 4838, informational, April 2007. [3]K. Scott and S. Burleigh, â€Å"Bundle Protocol Specification,† IETF RFC5050, experimental, November 2007. [4]K. Fall and S. Farrell, â€Å"DTN: an architectural retrospective,† Journal of Selected Areas in Communications, vol. 26 no. 5, pp. 828- 836, June 2008. [5]William D. Ivancic (NASA Glenn Research Center), â€Å"Security Analysis of DTN Architecture and Bundle Protocol Specification for Space-Based Networks†, IEEEAC paper1057, Version 4, Updated 2009:10:27 [6]DTN The State of the Art (http://wiki.n4c.eu/wiki/images/0/03/Proposal_description.pdf) [7] Challenged Internet Access Network Technology Infrastructure (CHIANTI March 2008) [7]http://en.wikipedia.org/wiki/Delay-tolerant_networking [8]L. Wood, W. Eddy, P. Holiday: â€Å"A Bundle of Problems,† IEEE Aerospace conference, Big Sky, Montana, March 2009. [9]K. Scott and S. 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