Mobile Computing with WirelessLAN and its Modes

Mobile Computing with WirelessLAN and its Modes Mobile computing with WirelessLAN And its modes Ad hoc network with challenges Pallavi D. Dudhe, Prof. P. L. Ramteke Abstract In this paper, we summarized Mobile computing with WirelessLAN and its modes Ad hoc network and infrastructure. We define the operational model of our mobile computing environment, where we plan to demonstrate our proposed solutions. Mobile cloud computing is the combination of both cloud computing and mobile networks to bring benefits for mobile users, network operators, as well as cloud computing providers. In the present mobile communication environment, lot of research is going on, to improve the performance of issues like handoffs, routing etc. Security is another key issue that needs to be considered, when the setup of communication channel is to be set. Wireless local area network (WLAN) security are inherently weak and do not provide adequate security. Newer, more robust, wireless security technologies are being developed but have not had widespread acceptance within corporate information infrastructures. An ad hoc network is a collection of mobile nodes equipped wi th wireless communication adapters; these nodes dynamically form a temporary network without the need of any existing network infrastructure. Earlier studies on ad hoc networks aimed to propose solutions to some fundamental problems, such as routing, coping with the new challenges caused by networks and nodes features without taking the security issues into account. Keywords – Mobile computing, mobile computing security, mobile agent’s security, mobile ad hoc networks, wireless networks. I. INTRODUCTION Mobile computing requires wireless network to support outdoor mobility and handoff from one network to the next at a pedestrian or vehicular speed. Traveler in car using laptop connected with a GSM phone engaged in mobile computing. One of the more exciting information technologies to come about in the last several years was wireless computing. Computer users have to be tied to massive desktop computers to accomplish their daily tasks. Ubiquitous computing or pervasive computing refers to access to computer network at any location by any person all the time. With the rapid growth in the wireless mobile communication technology, small devices like PDAs, laptops are able to communicate with the fixed wired network. Because of its flexibility and provision of providing ubiquitous infrastructure, there is need to provide security at any level. As wireless communication takes place mainly through the radio signals rather than wires, it is easier to intercept or eavesdrop on the communicat ion channels. Therefore, it is important to provide security from all these threats. There are different kinds of issues within security like confidentiality, integrity, availability, legitimacy, and accountability that needs to be individually taken care off. Mobile Cloud Computing at its simplest refers to an infrastructure where both the data storage and the data processing happen outside of the mobile device. Mobile cloud applications move the computing power and data storage away from mobile phones and into the cloud, bringing applications and mobile computing to not just Smartphone users but a much broader range of mobile subscribers. Nowadays, microprocessors and wireless adapters are embedded in many devices, as cell-phones, PDAs, Laptops, digital sensors, and GPS receivers. These well-equipped devices allow the creation of wireless mobile networks, which make the vision of nomadic computing with its ubiquitous access more and more attractive. II. VARIOUS FORMS OF COMPUTING Mobile, ubiquitous, nomadic, untethered, pervasive and anytime, anywhere, any person computing  are used by researchers to refer to computing that uses small portable devices and wireless communication network. Nomadic computing refers to limited migration. Migration is within a building at a pedestrian speed. In the same vein, users carrying laptop with DIAL-UP modems are engaged in nomadic computing. Ubiquitous computing or pervasive computing refers to access to computer network all the time at any location by any person.Ubiquitous computing can not be realized unless mobile computing matures. Figure 1. Relationship between computing One of the more exciting information technologies to come about in the last several years was wireless computing. WirelessLANs operate in one of two modes, ad-hoc or infrastructure. Ad-hoc defines a method of wireless computer peers to exchange data without a predefined network infrastructure and has not met with great success. The infrastructure mode of operation is predominantly used for construction of wireless networks and requires two components; wireless access point(s) connected to a traditional wired network and wireless network interface card(s) installed into the computing devices. III. GENERAL ARCHITECTURE OF WIRELESS NETWORKS Wireless LAN is a traditional LAN architecture extended with a wireless interface to service small low-powered portable terminals capable of wireless access. The wireless LAN is further connected to a more extensive fixed network such as LAN or WAN. Wireless LANs have limited range and are designed to be used only in local environments. There are two types of wireless LAN architectures: ad-hoc networks and infrastructure networks. The Wide-Area Wireless Networks are special mobile radio networks that provide wide coverage for low bandwidth data services. In paging networks the service is usually receive-only and has very low bandwidth. The initial applications for satellite systems are voice and paging. Additional services planned include messaging and fax transmission. Wireless networks communicate by modulating radio waves or pulsing infrared light. Wireless communication is linked to the wired network infrastructure by stationary transceivers. The area covered by an individual transceivers signal is known as a cell. Cell sizes vary widely: Figure 2. Architecture of wireless networks A. Operational problems associated with wireless network Disconnection:-Wireless communications suffer from frequent disconnections due to a higher degree of noise and interference as well as the process of inter-cell hand-offs. Disconnections can be hidden by asynchronous operation. Heterogeneous network:-To achieve wireless communication a mobile host must get connected to different and heterogeneous networks. The general problem of heterogeneity can be addressed by exploiting emerging distributed systems. Bandwidth and Interface Variability:-Bandwidth can shift one to four orders of magnitude, depending on whether the system is plugged in or using wireless access or switching interfaces, e.g. from infrared to radio when the user moves from indoors to outdoors. Mobile applications have to adapt their behaviour properly. Security Risks:- Precisely because connection to a wireless link is so easy, the security of wireless communication can be compromised much more easily than that of wired communication. B. Challenges regarding wireless network Main cause of loss of packets in wired network is congestion because error rates are very low. In wireless network, congestion still remains a problem, but this situation is somewhat reversed. Wired and wireless network require different techniques to achieve reliability and flow control. TCP works is unsuitable for wireless network as it interprets errors as packet loss. ITCP (split/indirect TCP) splits TCP into two parts , One between sender and local MSS of the recipient. The other between local MSS and recipient. If MH switches cell during life time of a ITCP Connection center point of connection moves to new MSS. sender remains completely unaware about it. IV. AD HOC NETWORK An ad hoc network is a collection of mobile nodes equipped with wireless communication adapters, these nodes dynamically form a temporary network without the need of any existing network infrastructure. A mobile ad hoc network, or MANET, is a temporary infrastructure less network, formed by a set of mobile hosts that dynamically establish their own network, without relying on any central administration. Mobile hosts used in MANET have to ensure the roles that were ensured by the powerful fixed infrastructure in traditional networks. This is a challenging task, since these devices have limited resources such as CPU, storage, energy, etc.Moreover, the networks environment has some features that add extra complications, such as the frequent topology changes caused by nodes mobility, and the unreliability and the bandwidth limitation of wireless channels. A. Security requirements of ad hoc network The security services of ad hoc networks are not different than those of other types of network communication. The goal is to protect the information and the resources from attacks and misbehavior. In working with network security, there are many requirements that an effective security must ensure: Availability: ensures that the desired network services are available whenever they are expected, inspite of attacks. Systems that ensure availability seek to combat denial of service and energy starvation  attacks that we will present later. Authenticity: ensures communication from one node to another is genuine. It ensures that a malicious node cannot masquerade as a trusted network node. Data confidentiality: is a core security primitive for ad hoc networks, It ensures that a given message cannot be understood by anyone else than its (their) desired recipient(s). Data confidentiality  is typically enabled by applying cryptography Integrity: denotes the authenticity of data sent from one node to another. That is, it ensures that a message sent from node A to node B was not modified by a malicious node, C, during transmission. Non-repudiation ensures that the origin of the message is legitimate. i.e. when one node receives a false message from another, nonrepudiation allows the former to accuse the later of sending the false  message and enables all other nodes to know about it. Digital signature may be used to ensure  nonrepudiation B. Challenges regarding Ad hoc network Ad hoc network routing is the ultimate challenge. Ad hoc networks arise in rapid deployment scenarios: Emergency disaster management. Military operation in remote sites. Business meeting venues without infrastructure support. Many routing algorithms are designed: AODV, DSR, DSDV, TORA, FSR, LAR, ABR, etc.There are interesting application of conventional graph theoretic problems in ad hoc network routing. V. CHALLENGES REGARDING MOBILE COMPUTING Mobile computing affects entire spectrum of issues in computing. First of all it is distributed and mobile computing. Distributed computing as we know works on static wired network. Node may initiate computation somewhere and migrate to another place. So two major problem that arise due to mobility are Searching for current location of a mobile node and to impose a communication structure among nodes. Physical location of mobile is not the network address, so how do we route the message to a mobile host. This question is being addressed by two different communities: Internet community and cellular community . Work of Internet community involves Mobile IP which work as assumes connection-less, packet switching scenario. Cellular communitys effort based on location management of cellular phone users. It deals with connection oriented communication, since it is motivated by issues in call-setup in telephony. Main problem in mobility management is to find an appropriate trade-off between searching and informing. Searching is performed when address of the message recipient is not known or at least not known precisely. Informing is a responsibility of the mobile unit when it migrates. Extreme situations can be Mobile unit never informs works for units receiving few messages and for units which dont move during receiving. Always informs works well for units receiving messages frequently. VI. CONCLUSION In this paper we have studied the different challenges regarding wirelessLAN, its modes Ad hoc network and infrastructure as well as requirement regarding security. As with every Information technology project, security must be a primary consideration. For security to effective, it must be deployed proportional to risk. WLANs present a security risk to organizations but providing security for WLANs is not an insurmountable challenge. There are security solutions available for WLANs to mitigate those most conceivable risks we think securing ad hoc networks is a great challenge that includes many opened problems of research, and receives more and more attention among ad hoc networks community. REFERENCES [1] Abolfazli, Saeid; Sanaei, Zohreh; Ahmed, Ejaz; Gani, Abdullah; Buyya, Rajkumar (1 July 2013). Cloud-Based  Augmentation for Mobile Devices: Motivation, Taxonomies, and Open Challenges.IEEE Communications Surveys Tutorials 99 (pp): [2] R.K.Ghosh ,CSE100, April 2005. [3] Arbaugh, W. A., Shankar, N., Wan, J. Y. (2001). Your 802.11 Wireless Network has No Clothes. Unpublished manuscript, University of Maryland at College Park. Retrieved October 21, 2004, from http://www.cs.umd.edu/~waa/wireless.pdf [4] William Stallings. Cryptography and Network Security principles and practices. Pearson Education  Inc, third edition edition, 2003. [5] Frank Stajano and Ross Anderson. The resurrecting duckling: Security issues for ad-hoc wireless  networks. In 7th International Security Protocols Workshop, Cambridge, UK, April 1999. [6] Duchamp, D. (1992) Issues in Wireless Mobile Computing. Proceedings Third Workshop on Workstation Operating Systems, April 1992, 2-10. [7] Sumi Helal,Ph.D Associate professor, computer information science Engineering Department , University of Florida, Gainesville.FL32611,[emailprotected]. [8] Berghel, H. (2004). Wireless Infidelity I: War Driving.Communications of the ACM, 47(9), 21-28. [9] Forman, G.H. and Zahorian, J. (1994) The Challenges of Mobile Computing. IEEE Computer, April 1994, 38- 47. [10] Charles.E. Perkins and Elizabeth.M. Royer. Ad hoc on demand distance vector (AODV) algorithm.  In the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA99), pages 90-100, 1999.

Ecosystem Services Essay -- Environmental Science

D1. What are ecosystem goods and services? People have been relying for their daily needs and well-being on nature. The natural ecosystem provides varieties of goods and services to us, for instance, fresh water, fisheries, timber, water purification etc. The benefits that people directly get from the natural systems are called ecosystem services (ES). The natural ecosystem provides both goods and services to us. The ecosystem goods are the things that people produced from soil, water and plants; Crops, Fibre, Timber, Livestock, Tourism, etc. are the example of ecosystem goods. And, at the same time people get a varieties of fundamental and life supporting services such as flood control, clean air and water, pollination of crops and other plants, natural hazard regulation, cultural, spiritual and aesthetic services which are called ES ( Kerr, G., 2010). Classification of ecosystem services The united nation was carried out an extensive study of current condition and trends of ecosystem services with the help of 1,300 experts from around the world and prepared the The Millennium Ecosystem Assessment (MEA) Report in 2005. This report classifies ecosystem services into four types. 1) Supporting services: It is a fundamental unit of ecosystem services which support other ecosystem services. The soil formation, photosynthesis, nutrient cycling and water cycling are the supporting service in ES. 2) Provisioning services: These include the goods or products obtained from ecosystem such as foods (crops, livestock, fisheries, aquaculture, and wild foods), Fibre (timber, cotton, silk, wood fuel, genetic resources, biochemical, natural ... ...then the decision. The decision maker should know the consequences of their decision in ES, for example how timber supply, making dam and extensive land use for agriculture affect in ES. The decision maker action may change the ES, they should consider the trade-offs among many option at decision making time and should chose the policies that help to foster and sustain the ES (Ranganathan, J. et al., 2008). Conclusion The benefits that we get from the nature are ES and it is indispensable for our overall development and prosperity. Works Cited Ranganathan, J. et al. (2008). Ecosystem Services a Guide for Decision Makers. World Resources Institute. Kerr, G. (2010). Ecosystem Services Approach to Inform Environmental Management, Draft. Royal Roads University, Victoria, BC.

Piaget’s Developmental Psychology Essay

Piaget (1896-1980) believed that there was a quantitative difference between the intelligence of adults, young children and older children. He believed adults have better knowledge of the world and because children do not use the same logic in there thinking. He believed that children’s logic changed as they developed through their four stages of life Piaget came to this conclusion after completing his cognitive development test. Unlike psychologist Siegler and Huges, Piaget is a theoretical psychologist and carried out many experiments to illustrate his theories. These stages have been critisied by many psychologist including Hughes, Siegler, Rose, Blank. Sensorimotor Stage Piaget believed that a new born had basic biological motivations, and acquired knowledge by accommodation and assimilation, and once a child has acquired these schemas it would be at equilibration. It has been argued that Piaget underestimated the intelligence of a newborn. Piaget’s sample did not illustrate a wide variety of children therefore his experiment cannot be related to every child at that relevant age. His study was also only preformed on his own children therefore results could have been bias. Similar experiments were devised by other psychologist giving different conclusions, indicating Piaget’s results were not always reliable. Piaget’s first stage stated that a baby (0-2) first explores the world using motor and reflex actions. For example a child reaches towards an object and after many attempts will be able to eventually grasp the object and then bring the object to its mouth and will continue to explore it uses the senses of taste and smell. A child is said to have completed this stage of development once they have obtained object permanence (a child understands that an object still exists even when it is not visible). This theory was tested by giving a 5-6 months old child a toy to play with, the toy was covered with a cloth and the baby’s behavior observed. Results showed that a baby immediately lost interest as if the object never existed. However when tested with a 10 month old child it would continue to reach for the toy although it could not see it. Another explanation is that the child did not think the toy had seized to exist but was distracted by the movement of the cloth, which is why the child looks away and appears to have ‘forgot’ the toy. Bower and Wishart (1972) argued that it does still exist in a babies mind even when it may not be visible. There experiment was done on a baby less than four months; the baby was offered a toy but as it reached for the toy the lights were switched off this showed that even when the lights were off the child continued to reach for the toy. It can be argued that the child was not reaching out for the toy but was just reaching due to the discomfort of the sudden darkness. This study could also go against the ethics as the child could have been experiencing fear from the sudden loss sight. Pre-operational Stage At this stage a child develops symbolic thinking; another characteristic of this stage is egocentrism. Piaget devised a three mountain task to test this theory. A child was sat in front of a three mountains model, a doll was then placed at varies positions in the modeled mountains and pictures were presented, they were asked to pick the picture that represented what the doll could see. Four and five year olds selected the picture showing what they could see, this suggested that they thought the doll could see what they could identifying egocentrism. However most seven years old were able to identify the correct picture. Due to Piaget’s selection of children it was very difficult to apply his findings to others, his own children were used throughout most of his experiment and any others were from well educated backgrounds. It can be argued that this experiment lacked ecological validity as the child could not relate to the situation they were presented with. Hughes devised a task to test egocentrism in a child but relating to an everyday situation, children as young as three and a half answered the question correctly, and 90% of children tested altogether were able to give the correct answer. Concrete operational stage A child enters this stage when they understand the appearance of something may change although the item itself remains the same. Piaget tested this stage by setting out a row of counters in front of each child, than asking the child to make another row the same as the first one. Piaget would than spread out his row of counters and ask the child if there were still the same amount of counters. This experiment tested a child’s conservation of numbers. Most seven year olds were able to answer this question correctly concluding by the age of seven children are able to conserve numbers. To test the conservation of liquid Piaget collected two identical glasses A + B and a taller thin container C and asked the child which container held more, he then transferred the liquid from A+B to C and asked the child again. When a child was able to identify that both containers held the same amount of liquid they had achieved the concrete operational stage. Many aspects of this test have been criticized, including the social context of the child’s understanding. Rose and Blank argued that when a child is asked the same question twice they assumed there first answer was incorrect and changed their answer. When Rose and Blank replicated this experiment and only asked the question once most six years olds gave the correct answer. McGarriglr and Donaldson (1974) argued that as the adult changed the appearance children would assume this was significant so devised an experiment were the appearance of the items were changed accidently. Children tested were between four and six, results showed that more than half tested gave the correct answer. Confirming children conserve at a younger age than Piaget claimed. Formal Operational Stage A child shows logical thinking but generally needs to be able to work through sequences with actual objects. Once a child can manipulate ideas in their head it has entered the formal operational stage. Piaget tested this by giving each child string and weights and told them to find out which factors affects a complete swing of the pendulum they could vary the weights, length of string and strength of push. Piaget found children who had entered the formal operational stage approached the task systematically testing one variable at a time. Psychologist Robert Siegler (1979) tested children aged five and upwards, by using the balance beam test. Results showed that eventually the child would take into account the interaction between the weight and the disc but would not achieve this ability until they were between 13 and 17. This concluded that children’s cognitive development is based on acquiring and using rules in increasingly more complex situations instead of stages. Conclusion Piaget tested his children and well-educated professionals therefore making his findings ungeneralised and potentially bias. Subsequent questions relating to the child’s individual answer may have led children to give the answer researchers were looking for. Piaget underestimated the ability of children’s social understanding. A child’s perception of an adult the importance of a familiar context and the meaning of a second question all affect a child’s performance. Weaknesses in Piaget experiment prevent children from showing what understood. Piaget overestimated the age at which children entered the formal operational stage (Siegler). As Piaget focused on individual children he failed to take social settings into account. He failed to show that development is continuous and not in stages Evidence suggests that environmental factors, ethics and gender could alter a child’s development. Small samples and controllability of variables were not taken into account. Piagets had very little evidence to support his findings and believed that his finding could be applied to every child. Piaget’s focus on qualitative development has played an important role on education. Piaget opened the opportunities for others to learn and discover more on how children development.

The Concept Of American Democracy - 1699 Words

Democracy is perhaps the most elusive concept of all times. But if there has to be something more elusive, it will surely be the concept of American democracy. In 1858, Abraham Lincoln is known to have written:  ¨As I would not be a slave, so I would not be a master †¦ This expresses my idea of democracy. Whoever differs from this, to the extent of the difference, is no democracy. ¨ The initial understanding of American democracy takes the form of an antithesis of English colonialism and slavery. Based on this understanding, there is little doubt that the foundations of the  ´greatest democracy on earth ´ are to be found in the darkest, the most blatantly majoritarian and atrocious times. There is little disagreement among constitutional†¦show more content†¦How does the American concept of democracy reconcile with the  ¨rule by the people, of the people and for the people ¨ conception of democracy today? While America truly is exceptional in its dynamism, it is also shockingly imperfect in ways that most true patriots refuse to accept. ItÅ› greatness and freeness is by no means premised on empirical facts. If anything, the situation is otherwise. Freedom House, is an independent watchdog that rates countries based on their civil and political rights accessibility to the citizens. According to their 2017 report, America scored the highest mark on each front, just like many other European countries, but it ranks much lower according to the aggregate score, which takes into account factors like electoral process, political pluralism and participation, and functioning of government, freedom of expression and belief etc. For me, as a foreigner, the idea of American democracy can be better understood as a culture, rather than a system of government. 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