Thesis (M.S. in Telecommunication System Management)--Naval Postgraduate School, December 1990. / Thesis Advisor(s): Suh, Myung W. Second Reader: Dresser, Cynthia H. "December 1990." Description based on title screen as viewed on March 29, 2010. DTIC Descriptor(s): Telecommunications, Saudi Arabia, background, telegraph systems, telephone systems, geography, history, theses Author(s) subject terms: Saudi Arabia; Post, Telegraph and Telephone, telecommunication system; tephone system; telegraph Includes bibliographical references (p. 66-68). Also available in print.

Thesis (Ph.D.)--Technischen Universität Berlin, 2001. / Includes bibliographical references (leaves 195-201). Also available on the Internet via the World Wide Web.

Thesis (Ph.D.)--George Mason University, 2009. / Vita: p. 127. Thesis director: Songqing Chen. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computer Science. Title from PDF t.p. (viewed Nov. 11, 2009). Includes bibliographical references (p. 120-126). Also issued in print.

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2006. / Includes bibliographical references (leaves 50-51). Also available in electronic version.

No description available.

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Device to device (D2D) links density is expected to increase dramatically in future networks. The D2D user equipments (DUEs) reuse frequency resources to cover the next generation D2D-enabled cellular network requirements. The cellular user equipments (CUEs) and DUEs experience in-band emission interference (IEI) from DUEs that use adjacent frequencies. In this thesis, the IEI impact in D2D-enabled cellular network is investigated comprehensively. In the first part, the IEI from the DUEs to cellular links is initially mitigated for all time slots. An open loop power control (OLPC)-based scheme is introduced for the D2D discovery scenario to mitigate the IEI and compared with recent proposed methods. The scheme defines time slots to boost the DUEs transmission power, where the IEI is mitigated and the D2D link performance is improved. A simulation system is used to evaluate the IEI impact. The IEI from DUEs to cellular links is mitigated without taking into account the proposed power control can affect the DUEs that use the same frequency resource and the constraints can affect the D2D link performance. Therefore, the second part expands the IEI investigation, where the D2D-enabled cellular network is modelled by taking into account the IEI interferers using the stochastic geometry tool. The IEI impact is analysed and mitigated for all time slots by taking into account the D2D links performance. The IEI impact is evaluated theoretically in terms of coverage probability and data rate for cellular link side, successful probability and data rate for D2D link side. The IEI intra-cell and IEI inter-cell are investigated separately to detect the dominant part of IEI. The expected reuse factor of the D2D resource blocks (DRBs) is derived to examing the number of DUEs that can be served when the IEI is or is not taken into account. Following, a power-density based (PDB) strategy is proposed to mitigate the IEI by controlling the number of DUEs that use each DRB, and by allocating predefined DRBs to the DUEs that cause lowest interference power at the serving BS. The thinning process and Poisson hole process (PHP) are employed to remodel the network. The performance improvement can be achieved by employing this strategy is evaluated. The optimal DRBs setting is found that mitigates the IEI and improves the cellular link performance. Furthermore, the optimal power allocation (OPA) algorithm is proposed to mitigate the IEI by calculating the optimal DUEs transmission power profile that maximizes the DUEs sum rate and maintains the interference level at the BS below a predefined threshold. The performance improvement that can be achieved by employing this algorithm is also evaluated. It is concluded that, in a D2D-enabled cellular network, the IEI impact is significant and needs to be considered to evaluate the performance of the future network accurately. Thus, the proposed model can be used to represent and evaluate the future network. Also, by employing the PDB strategy, the IEI can be mitigated effectively if the D2D links performance has higher priority than the number of DUEs required to be served for D2D discovery and transmission data scenarios. In case the required number of served DUEs in one time slot cannot be covered by PDB, the OPA algorithm and the OLPC-based strategy can be used for D2D data transmission and D2D discovery scenarios, respectively.

The present study analyses the effects of a number of geometric parameters on the performance of a trailing edge control flap on a hypersonic body. The tests were conducted in a gun tunnel at Mach 8.2 and Mach 12.3. The study revealed that flap deflection promoted separation lengthscales and boundary layer transition. The latter significantly increased the local aerothermal loads on the flap. For well separated flows, flap heat transfer rates were successfully predicted by reference temperature theory. The promotion of transition caused a progressive reduction in the lengthscales of separated flows. In a free-flight environment, vehicle incidence varies considerably. Incidence was found to promote transition on both flat plates and control flaps. The latter resulted in a considerable increase in flap heat transfer. A modified version of reference temperature theory successfully predicted the aerothermal loads on the flap. For laminar and transitional interactions, the separated flow lengthscale was found to have a complex variation with incidence. A number of relevant flow parameters were identified. The intense heat loads on a vehicle in hypersonic flight dictates the blunting of the leading edge. This strengthens the leading edge shock structure and generates an entropy layer. Bluntness was found to significantly decrease the separation interaction scales on the flap. This was due to a reduction in the pressure recovered on the flap. The latter adverse affects control effectiveness. The aerothermal loads on the control flap was successfully predicted by reference temperature theory. An investigation into the efficiency of an under-expanded transverse jet controls was conducted on an axi-symmetric slender blunt cone. Force measurements found that the interaction augmented the jet reaction force by 70% at zero incidence. This increased to 110% at low incidence. The experiments found that the scale of the interaction region was determined by Poj/pes. Using this parameter, a closed loop algorithm for the shape of the separation front was developed. The latter can be used to predict jet reaction control effectiveness.

The expectations and visions of the mobile phone in a development context is vast. International development institutions such as the World Bank, World Summit of the Information Society and International Telecommunication Union together with business conglomerates Google and Facebook have all invested their perspectives and visions of how the information and technology community should unfold in Uganda. How do their perspectives merge, interfere and contrast with the perspectives and visions of actors in Uganda?   The research objective is to explore the feminist and postcolonial technoscientific practices of the mobile phone in a Ugandan context. In my exploration I use ethnographic, participatory and narrative methods to study the imaginations and real-time uses of the mobile phone among actors in the ICT community.   I ask how actors in technology hubs in a low-income country relate to local innovations and design processes. Using a diffractive method for analysis I discuss how stories of corruption and responsibility are entangled with the development of mobile applications for the local context and the relation of designers and users.   I ask how the mobile phone is changing the socio-technical relations of gender, technology and development. Using diffraction, intersectionality and figuration as cartographic nodes for discussion I examine how the initiatives Girl Geek Kampala and Women in Technology Uganda renegotiate and reconstitute the understandings of gender and technology.   I ask how the mobile phone is creating and changing the infrastructuring in Uganda. I address the situatedness of the mobile infrastructuring by departing in the generic properties of an infrastructure by Star and Ruhleder (1996). The mobile phone is being used for entertainment purposes, developmental goals and marketing strategies and cannot be singled out as a device that represents a uniform vision of the information society. The examination of situatedness suggests that the strength of understanding the mobile infrastructure lies in the ambiguity of sustaining and transforming relations simultaneously, or better yet, a posthumanist performativity where human and non-human forms of agency are taken into account.    The entanglements of postcolonial information and communication technologies, feminist technoscience and design form the basis for a discussion on how we invite collaborations between policy makers, business entrepreneurs and civil society organizations that engage and shape the futures we are responsible for. My ambition is to develop ways of re-thinking social innovation and technology development, which interfere with linear economic development and raises the participatory paradigm in science and technology policy.

Mobile phone networks are on the verge of a major breakthrough in terms of the services they offer. At the same time, active networks are being presented as the next step in the evolution of network architecture, with the aim of providing greater functionality within the network but retaining flexibility. At the same time, the 3G revolution seems to be floundering, due to the need to make a financial return on the huge investment tied up in the licences. This thesis seeks to provide a way forward, by investigating the implementation of a novel service that is the provision of video streaming across the mobile network with location dependent advertisement insertion. The work retains flexibility within the network architecture to enable additional services to be evolved and implemented with minimal modification to the nodes. The approach taken is to combine the traditional architecture with active functionality. As a result this thesis describes a novel service, the implementation of a short video service with location dependent advertisement insertion. This enables the provider to generate an income by transporting the service (it is possible for a third party to generate the content instead of the network provider) and by selling the advertisement space. This thesis investigates the implementation issues involved in providing the service and presents a protocol for the operation of it. The impact of this service on other users is also studied with the conclusion being that it does not adversely effect the quality of service of the voice traff ic within the network. In order to investigate the implementation of the protocol, a simulation model was constructed in OPNET [42]. This enabled the operation of the protocol to be tested under artificial conditions using fixed movements, to verify that it operated as specified. Then under more realistic conditions, so as to predict its effect on the other traffic in the network.