Visions of 4G

ABSTRACT

As the virtual centre of excellence in mobile and personal communications (Mobile VCE) moves into its second core research programme it has been decided to set up a fourth generation (4G) visions group aimed at harmonising the research work across the work areas and amongst the numerous researchers working on the programme. This paper outlines the initial work of the group and provides a start to what will become an evolving vision of 4G. A short history of previous generations of mobile communications systems and a discussion of the limitations of third generation (3G) systems are followed by a vision of 4G for 2010 based on five elements: fully converged services, ubiquitous mobile access, diverse user devices, autonomous networks and software dependency. This vision is developed in more detail from a technology viewpoint into the key areas of networks and services, software systems and wireless access.

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Model checking for Securing E-commerce transaction

ABSTRACT

The rapid growth of electronic commerce (e-commerce) has necessitated the development of e-commerce protocols. These protocols ensure the confidentiality and integrity of information exchanged. In addition, researchers have identified other desirable properties, such as, money atomicity, goods atomicity and validated receipt that must be satisfied by e-commerce protocols. This seminar shows how model checking can be used to obtain an assurance about the existence of these properties in an e-commerce protocol. It is essential that these desirable properties be satisfied, even in the presence of site or communication failure. Using the model checker we evaluate which failures cause the violation of one or more of the properties. The results of the analysis are then used to propose a mechanism that handles the failures to make the protocol failure resilient.

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Adding Intelligence to Internet

ABSTRACT


Two scaling problems face the Internet today. First, it will be years before terrestrial networks are able to provide adequate bandwidth uniformly around the world, given the explosive growth in Internet bandwidth demand and the amount of the world that is still unwired. Second, the traffic distribution is not uniform worldwide: Clients in all countries of the world access content that today is chiefly produced in a few regions of the world (e.g., North America). A new generation of Internet access built around geosynchronous satellites can provide immediate relief. The satellite system can improve service to bandwidth-starved regions of the globe where terrestrial networks are insufficient and supplement terrestrial networks elsewhere. This new generation of satellite system manages a set of satellite links using intelligent controls at the link endpoints. The intelligence uses feedback obtained from monitoring end-user behavior to adapt the use of resources. Mechanisms controlled include caching, dynamic construction of push channels, use of multicast, and scheduling of satellite bandwidth. This paper discusses the key issues of using intelligence to control satellite links, and then presents as a case study the architecture of a specific system: the Internet Delivery System, which uses INTELSAT’s satellite fleet to create Internet connections that act as wormholes between points on the globe.



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A Search Engine for 3D Models

ABSTRACT


As the number of 3D models available on the Web grows, there is an increasing need for a search engine to help people find them. Unfortunately, traditional text-based search techniques are not always effective for 3D data. In this paper, we investigate new shape-based search methods.
The key challenges are to develop query methods simple enough for novice users and matching algorithms robust enough to work for arbitrary polygonal models. We present a web-based search engine system that supports queries based on 3D sketches, 2D sketches, 3D models, and/or text keywords. For the shape-based queries, we have developed a new matching algorithm that uses spherical harmonics to compute discriminating similarity measures without requiring repair of model degeneracies or alignment of orientations. It provides 46{245% better performance than related shape matching methods during precision-recall experiments, and it is fast enough to return query results from a repository of 20,000 models in under a second. The net result is a growing interactive index of 3D models available on the Web (i.e., a Google for 3D models).



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IMPROVING THE GLOBAL INFORMATION GRID’S PERFORMANCE THROUGH SATELLITE COMMUNICATIONS LAYER ENHANCEMENTS

ABSTRACT


With the Information age in full and rapid development, users are becoming accustomed to having immediate access to information. Users demand more capabilities from every kind of electronic devices, more processing power, more features and better connectivity. Users are also realizing the benefits of collaborating with others in their communities to help expand the body of knowledge. One user that understands the benefits of information sharing is the United States Department of Defense. The DoD’s Networks-centric enterprise services initiative, along with the concept of pushing the “power to the edge” aims to enable end users with maximum situational awareness and the most comprehensive battlespace, all in a secure networking environment. Providing so much data and capabilities to the end user, however will require an increase in communication capabilities and efficiency. To address increased capability needs, the DoD is continually developing and enhancing the Global Information Grid [GIG] through out the various layers of communication infrastructure. One such layer of infrastructure involves the use of cooperative low earth orbiting satellites for efficient multicasting communications.



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Wireless Fidelity (Wi-Fi)

ABSTRACT


Wi-Fi, which stands for “Wireless Fidelity”, is a radio technology that networks computers so they connect to each other and to the internet without wires.It refers to wireless LAN products based on the IEEE 802.11b specification.Users can share documents and projects,as well as an internet connection among various computer stations.

A Wi-Fi network operates just like a wired network, without restrictions imposed by wires .Not only does it enable users to move around and be mobile at home and at work, it also provides easy connections to the internet and business networks while travelling.

The technologies used in this field are one of the best in the wireless space. When compared with other fast improving technologies like Bluetooth and 3G, Wi-Fi is seen to have many advantages. We can setup networks at home and office using Wi-Fi . It is fairly easy to setup a Wi-Fi enabled network at home or a small office. Wi- Fi is several times faster than Bluetooth and operates like a high speed modem.

There are many security issues that come under Wi-Fi . The main problem that it has till now is that it is easy for hackers to attack the network. The security method that is used now is the WEP (Wired Equivalent Privacy).The new VPN (Virtual Private Network) method seems to correct everything that is wrong with WEP.



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Parasitic Computing

ABSTRACT


“PARASITE” as the word suggests is an entity that resides on another entity exploiting the resources of the latter. The term “PARASITIC COMPUTING” refers to the technique of using the resources of one computer by another computer without the knowledge of the former. Distributed computing networks turn home users’ computers into part of a virtual supercomputer that can perform time-intensive operations. This seminar provides an insight into the details of how parasitic computing uses the computation power of the computers connected to the internet in solving complex mathematical problems. This technique was developed by the scientist at the Notre Dame University, Indiana (USA). According to the scientists, the transmission control protocol (TCP), could be used to solve a piece of a mathematical problem whose answer could then be relayed back to the original user. The implementation is discussed with the NP-Complete problem as example. Unlike hackers who exploit flaws to gain direct access to machines, the Notre Dame computer scientists created a virtual computer by using the fundamental components of distributed computing.



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