Broadband mobile communication based on both broadband Internet and the third generation mobile communication system (3G) is going to play the role as a major channel for customers to obtain various services. It takes advantages of acquiring services with time saving, and any-time and any-place access in the near future. It is very obvious that eventually all companies offer real-customized broadband mobile services at the right time in the right place with the right price, so-called mobile commerce, due to customers' requirements and technology advancements e.g., data mining, global roaming, GPS, mobile location services, mobile IP and IPV6, etc. Syndication and alliance will be shaped and concreted within and between companies for mobile commerce under the information infrastructure of both 3G and broadband Internet. New business opportunities are emerging considerably. However, companies are facing many more difficult challenges of losing customers easily due to quick and cheap switch from one company to another. Therefore, it is one of the most important topics now for companies to attract customers, satisfy customers, and win their loyalty through appropriate customer relationship management (CRM). In this research, we survey the development ofCRM, its conceptual architecture, function, and advantage to both customers and companies. We study and compare four popular CRM systems - 12, Siebel, NCR, and BroadVision, which are currently available in the global market. And, we examine the current advancements of related information and communication technologies for CRM and figure out new trends of CRM for broadband mobile commerce based on the 3G and broadband Internet. Furthermore, we address the management and marketing strategies ofCRM for the coming challenges in the broadband mobile commerce era.

<p>Adaptive antenna arrays have a great importance in reduction of the effect of interference and increase the capacity for the mobile satellite communication. Interference and multipath fading remain a main problem for reception of signals. These two problems obviously affect the overall capacity.  Adaptive antenna arrays in the handheld mobile apparatus will be the solution for the above two problems.</p><p> </p><p>Satellite mobile communication is one of the growing fields in the communication area where terrestrial infrastructures are unable or ineffective to supply. Maritime, aeronautical and land mobile are some of the applications. During natural disasters where ground services are stopped, mobile satellite communications has great importance. Following the hurricane season, the Asian Tsunami and the devastating Haiti earthquake, mobile satellite communications had played a great role to fill the communication gaps.  The satellites can be tracked automatically by adaptive antenna array when it moves in its orbital plane.</p><p> </p><p>In this thesis the methods that how the adaptive antenna array combats interferers is presented and simulated using MATLAB software. The performance of the adaptive antenna array is evaluated by simulating the directivity pattern of the antenna and Mean Square Error (MSE) graph for different scenario like Signal to Interference Noise ratio (SINR), number of iterations, antenna array elements and convergence factor (μ), assuming the signals are coming from different Direction of Arrival (DOA).</p><p> </p><p> </p>

Power and timing requirements are becoming more and more stringent as applications move from less mobile devices to more mobile ones. As such, it is important to optimize these applications as much as possible in order to provide the best solution that is low power and low latency. Although there are many different techniques to achieve a low power, low latency solution, this thesis focuses specifically on low power scheduling at the behavioral level where resource-constrained scheduling is the technique of choice since it directly considers the resource limitations of mobile devices. Conventional resource-constrained scheduling schemes are concerned with minimizing the latency or improving the speed of an algorithm--represented by a data flow graph (DFG)--given a limitation on resources. However, these conventional resource-constrained scheduling schemes are no longer applicable since power has grown to be a major issue, especially in mobile devices. Hence, the conventional resource-constrained scheduling schemes gave way to current resource-constrained scheduling schemes that utilize multiple voltages, which work to find a balance between speed and power. These current multiple voltage schemes use various techniques to balance and meet the speed and power requirements. But while they do a good job of meeting these requirements, they fail to address a new issue that is beginning to surface the number of memory registers needed. Therefore, to address this new arising issue, this paper presents a novel resource-constrained scheduling scheme that balances the speed, power, and register requirements. This algorithm is compared to both a conventional resource-constrained scheduling scheme and a current resource-constrained scheduling scheme with multiple voltages to show that it performs better in finding a scheduling solution. Benchmark results show that, on average, our algorithm has a better power savings while keeping the maximum number of registers needed and the latency low compared to conventional resource-constrained scheduling schemes and current resource-constrained scheduling schemes utilizing just multiple voltages. / Graduation date: 2004

Ad Hoc networks are multi-hop wireless networks consisting of mobile hosts. They do not have any pre-existing network infrastructure and are characterized by constantly changing topology, limited battery power and bandwidth. Typical applications of such networks are battlefield networks, medical relief during natural calamities or disasters, conference room networking, and intra-vehicular communications. Routing packets in an ad-hoc network is a challenge because of the mobile nature of the nodes and the constantly changing topology. In ad hoc networks, each mobile node functions as a router, forwarding packets, establishing routes and helping each other in maintaining the network. A novel scalable routing protocol SLURP (Scalable Location Updated-based Routing Protocol) addresses these issues of ad hoc networks routing. The protocol is based on a location management strategy, which keeps the routing overhead to a minimum. In this thesis we compare the protocol against an existing set of multi-hop ad hoc network routing protocols that cover a range of design choices: DSDV, TORA, DSR, and AODV. We implemented SLURP in the network simulator ns-2, with the necessary wireless extensions. Experiments were run to simulate changes in network topology, number of active sources, link connectivity, and speed of motion. The difference in performance and scalability are illustrated. / Graduation date: 2003

Thesis (M.S.)--Rochester Institute of Technology, 2007. / Typescript. Includes bibliographical references (leaves 61-64).

<p>This thesis o ers some prototypes to provide browser-based and mobile video communication services for Deaf people and evaluates these prototypes. The aim of this research is to identify an acceptable video communication technology for Deaf people by designing and evaluating several prototypes. The goal is to nd one that Deaf people would like to use in their day-to-day life. The thesis focuses on two technologies | browser-based systems and mobile applications. Several challenges emerged, for example, speci c Deaf user requirements are di cult to obtain, the technical details must be hidden from end users, and evaluation of prototypes includes both technical and social aspects. This thesis describes work to provide South African Sign Language communication for Deaf users in a disadvantaged Deaf community in Cape Town. We posit an experimental design to evaluate browser-based and mobile technologies in order to learn what constitutes acceptable video communication for Deaf users. Two browser-based prototypes and two mobile prototypes were built to this e ect. Both qualitative data and quantitative data are collected with user tests to evaluate the prototypes. The video quality of Android satis es Deaf people, and the portable asynchronous communication is convenient for Deaf users. The server performance is low on bandwidth, and will therefore cost less than other alternatives, although Deaf people feel the handset is costly.</p>

The objective of this research is to enhance the network performance under realistic mobile ad-hoc networks environments without modification of the standard. Overview of this research is summarized as follows: First, a packet-fragmentation technique to improve network throughput under the worst channel conditions is proposed. While the conventional packet-fragmentation technique research focuses only on random-bit errors, the proposed technique employs both random bit errors and hidden-node collisions. The analytical models based on Markov-chain model shows that the optimal fragmentation technique can effectively reduce the number of retransmissions caused by both collisions from hidden nodes and corrupted packets by random bit errors, and eventually improving throughput in noisy VANETs channels. As a second contribution, a dynamic service-channel allocation (DSCA) scheme is proposed to maximize the network throughput by dynamically assigning different service channels to the users. The theoretical analysis in this thesis will consider wireless access in the vehicular environment (WAVE) protocol, which is the main characteristic of the vehicular ad-hoc networks standard (the IEEE 802.11p). To summarize, the main contribution of this research is that two schemes will improve the network throughput significantly without modification of the standard. Therefore, there is no implementation issue to deploy the proposed schemes in real devices.

Mixed Reality experiences, that blend physical and virtual objects, have become commonplace on handheld computing devices. One common application of these technologies is their use in cultural heritage "walking tours." These tours provide information about the surrounding environment in a variety of contexts, to suit the needs and interests of different groups of participants. Using the familiar "campus tour" as a canonical example, this dissertation investigates the technical and cognitive processes involved in transferring this tour from its physical and analog form into Mixed Reality. Using the concept of spatial scale borrowed from cognitive geography, this work identifies the need to create and maintain continuity across different scales of spatial experience as being of paramount importance to successful Mixed Reality walking tours. The concepts of scale transitions, coordination of representations across scales, and scale-matching are shown to be essential to maintaining the continuity of experience. Specific techniques that embody these concepts are also discussed and demonstrated in a number of Mixed Reality examples, including in the context of a successful deployment of a Mixed Reality Tour of the Georgia Tech campus. The potential for a "Language of Mixed Reality" based on the concepts outlined in this work is also discussed, and a general framework, called the Mixed Reality Scale Framework is shown to meet all the necessary criteria for being a cognitive theory of Human-Centered Computing in the context of Mixed Reality.

The delay tolerant networks (DTNs) is characterized by frequent disconnections and long delays of links among devices due to mobility, sparse deployment of devices, attacks, and noise, etc. Considerable research efforts have been devoted recently to DTNs enabling communications between network entities with intermittent connectivity. Unfortunately, mobile devices have limited energy capacity, and the fundamental problem is that traditional power-saving mechanisms are designed assuming well connected networks. Due to much larger inter-contact durations than contact durations, devices spend most of their life time in the neighbor discovery, and centralized power-saving strategies are difficult. Consequently, mobile devices consume a significant amount of energy in the neighbor discovery, rather than in infrequent data transfers. Therefore, distributed energy efficient neighbor discovery protocols for DTNs are essential to minimize the degradation of network connectivity and maximize the benefits from mobility. In this thesis, we develop sleep scheduling protocols in the medium access control (MAC) layer that are adaptive and distributed under different clock synchronization conditions: synchronous, asynchronous, and semi-asynchronous. In addition, we propose a distributed clock synchronization protocol to mitigate the clock synchronization problem in DTNs. Our research accomplishments are briefly outlined as follows: Firstly, we design an adaptive exponential beacon (AEB) protocol. By exploiting the trend of contact availability, beacon periods are independently adjusted by each device and optimized using the distribution of contact durations. The AEB protocol significantly reduces energy consumption while maintaining comparable packet delivery delay and delivery ratio. Secondly, we design two asynchronous clock based sleep scheduling (ACDS) protocols. Based on the fact that global clock synchronization is difficult to achieve in general, predetermined patterns of sleep schedules are constructed using hierarchical arrangements of cyclic difference sets such that devices independently selecting different duty cycle lengths are still guaranteed to have overlapping awake intervals with other devices within the communication range. Thirdly, we design a distributed semi-asynchronous sleep scheduling (DSA) protocol. Although the synchronization error is unavoidable, some level of clock accuracy may be possible for many practical scenarios. The sleep schedules are constructed to guarantee contacts among devices having loosely synchronized clocks, and parameters are optimized using the distribution of synchronization error. We also define conditions for which the proposed semi-asynchronous protocol outperforms existing asynchronous sleep scheduling protocols. Lastly, we design a distributed clock synchronization (DCS) protocol. The proposed protocol considers asynchronous and long delayed connections when exchanging relative clock information among nodes. As a result, smaller synchronization error achieved by the proposed protocol allows more accurate timing information and renders neighbor discovery more energy efficient. The designed protocols improve the lifetime of mobile devices in DTNs by means of energy efficient neighbor discoveries that reduce the energy waste caused by idle listening problems.

Adaptive antenna arrays have a great importance in reduction of the effect of interference and increase the capacity for the mobile satellite communication. Interference and multipath fading remain a main problem for reception of signals. These two problems obviously affect the overall capacity.  Adaptive antenna arrays in the handheld mobile apparatus will be the solution for the above two problems.   Satellite mobile communication is one of the growing fields in the communication area where terrestrial infrastructures are unable or ineffective to supply. Maritime, aeronautical and land mobile are some of the applications. During natural disasters where ground services are stopped, mobile satellite communications has great importance. Following the hurricane season, the Asian Tsunami and the devastating Haiti earthquake, mobile satellite communications had played a great role to fill the communication gaps.  The satellites can be tracked automatically by adaptive antenna array when it moves in its orbital plane.   In this thesis the methods that how the adaptive antenna array combats interferers is presented and simulated using MATLAB software. The performance of the adaptive antenna array is evaluated by simulating the directivity pattern of the antenna and Mean Square Error (MSE) graph for different scenario like Signal to Interference Noise ratio (SINR), number of iterations, antenna array elements and convergence factor (μ), assuming the signals are coming from different Direction of Arrival (DOA).