International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California / There are a number of telemetry applications where it would be helpful to have networks of sensors that could autonomously discover their connectivity, and dynamically reconfigure themselves during use. A number of research groups have developed wireless ad-hoc sensor network systems. This paper reviews the state-of-the-art in wireless ad-hoc networks, examining the features, assumptions, limitations and unique attributes of some of the more popular solutions to this problem.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Sensor technology is continually advancing to meet demands of a wide range of potential applications. Many of these applications could be better served by distributed sensing than by traditional centralized sensing. To support these emerging applications, it is important to design and develop a unified framework for communication and network infrastructure capable of supporting various sensing functions. A research prototype operating in the 915 MHz Industrial, Scientific, and Medical band (ISM band) has been developed as potentially the core component of this infrastructure. In this paper, we will present the design and optimization of the system, data processing procedures, system parameters, network protocols, and experimental results.

published_or_final_version / abstract / Electrical and Electronic Engineering / Master / Master of Philosophy

Ad hoc networks provide a flexible, infrastructure-free means to communicate between soldiers in war zones, aid workers in disaster areas, or consumers in device-to-device (D2D) applications. Ad hoc networks, however, are stilled plagued by interference. Communication with millimeter-wave (mmWave) devices offers hope to ad hoc networks through higher bandwidth, reduced interference due to directional antennas, and a lighter interference field due to blockage. This report uses a stochastic geometry approach to characterize the one-way and two-way coverage probability of a mmWave ad hoc network with directional antennas and random blockages. The coverage probability in the presence of noise and both line-of-sight and non-line-of-sight interference is analyzed and used to derive the transmission capacity. Several reasonable simplifications are used to derive the transmission capacity. Performance of mmWave is then analyzed in terms of area spectral efficiency and rate coverage. The results show that mmWave networks support larger densities, higher area spectral efficiencies, and better rate coverage compared to microwave ad hoc networks. / text

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Cognitive radio is an important technology which aims to improve the spectrum resource utilization and allows a cognitive radio transceiver to detect and sense spectrum holes without causing interference to the primary users (PUs). As a result of the development of cognitive radio technology, the concept of cognitive radio ad hoc networks (CRAHNs) has recently been proposed in the literature, which aims to apply the cognitive radio to traditional ad hoc networks. However, this new network paradigm creates more research challenges than those in classical cognitive radio networks (CRNs). These research challenges in CRAHNs are due to the variable radio environments caused by spectrum-dependent communication links, hop-by-hop transmission, and changing topology. This study will focus on important research topics in spectrum management in scalable CRAHNs driven by local control, such as spectrum sharing, allocation, and mobility. To conduct this study, a local control approach is proposed to enable system-level analysis and protocol-level design with distributed protocols for spectrum sharing. In the local control approach, we can evaluate the system dynamics caused by either protocol-specific parameters or application-specific parameters in CRAHNs, which is hard to explore using existing methods. Moreover, combining the previous evaluations and scaling law analysis based on local control concept, we can design new distributed protocols based on the features of the medium access control (MAC) layer and the physical layer. In this study, the proposed research themes and related research issues surrounding spectrum sharing are discussed. Moreover, justification of the research has been made by experimental and analytical results. / Thesis (Ph.D, Electrical & Computer Engineering) -- Queen's University, 2013-02-04 14:37:45.883

Approved for public release; distribution is unlimited / Reissued 30 May 2017 to correct misspelled name of Dept. Chair on title page. / The Black Sea historically was the theater of rivalry between great powers, mainly the Ottoman Empire and Russia. After the collapse of the Soviet Union, rivalry on the Black Sea became much less intense as Russia weakened and NATO was not paying much attention to it. After the 2008 invasion of Georgia and the 2014 annexation of Crimea, NATO gradually resumed activity on the Black Sea, sending warships of non-littoral NATO members and conducting joint maritime exercises. Russia built a robust anti-access/area denial (A2/AD) bubble in Crimea and responded to NATO activation with provocative actions against NATO ships. At its most recent summit in Warsaw in 2016, NATO paid quite a lot attention to the Black Sea issue and committed to increase NATO presence in the area; nevertheless, the organization shared no signs of a clear strategy. This thesis discusses a potential alternative strategy for NATO, which is based on using its own strategy against Russia—with littoral NATO members and partners building a couple of A2/AD bubbles around the Russian one. The suggested strategy consists of the creation of a Black Sea defense coordination center, an integrated network of all source data exchanged, and the combined capabilities of robust land-based mobile anti-ship missiles, mobile air defense systems, and sea and air surveillance radars, as well as aviation and naval assets. / Civilian, Ministry of Defence of Georgia

Le résumé en français n'a pas été communiqué par l'auteur. / This thesis deals with several theoretical subjects about optimal fiscal and government policy. It contains my four works about tax and other redistributive policy, starting with the general introductory survey as the first chapter. Chapter 2 compares ad-valorem and specific taxation in models where a representative consumer with an exogenous income has both a quality and a quantity choice under perfect competition. In the setting, while ad-valorem tax causes income effect only, specific tax causes both income effect and substitution effect. Therefore, advalorem tax decreases consumer demand for both quality and quantity; on the other hand, specific tax decreases consumer demand for quantity. However, the sign of consumer demand for quality is ambiguous and is determined by the curvature of marginal utility on quantity. Additionally, using a constant elasticity of substitution (CES) utility function and a linear price function, we show that ad-valorem tax is superior to specific tax except for the Leontief preference under which the two forms of commodity taxes generate the same tax revenue. The substitution effect caused by specific tax disappears if the elasticity of substitution converges to zero. In Chapter 3, We examine optimal taxation and public good provision by a government which takes reduction of envy into consideration as one of the constraints. We adopt the notion of extended envy-freeness proposed by Diamantaras and Thomson(1990), called λ-equitability. We derive the modified Samuelson rule at an optimum income tax, and show that, using a constant elasticity of substitution utility function, the direction of distorting the original Samuelson rule to relax λ envy free constraints is crucially determined by the elasticity of substitution. Furthermore, we numerically show that the level of public good increases (or decreases) in the degree of envy-freeness when the provision level is upwardly (or downwardly) distorted. Also,Chapter 4 covers the topic of public good provision under income transfer under that ethical constraint, but allows the social planner to set the surcharge fee for the purpose of excluding some agents whereas we simplify their income as exogenous one (or initial wealth). In this chapter, we study optimal public good provision and user fee in order to exclude some agents by Rawlsian or utilitarian government under lump-sum transfer, constrained by reduction of envy. In particular, we employ the exclusion technique used in Hellwig (2005), i.e., the policymaker decides the level of provision and surcharge fee paid by those making access to it, as well as uniform transfer. Different from Hellwig (2005), we introduce heterogeneity in initial wealth for agents and the envy-free constraint with respect to their one, but not to their tastes for public good. In this setting, we derive the optimal provision level and user fee, and compared to those in Hellwig (2005), for Rawlsian government, the up-charge is lower than the one derived in Hellwig (2005) in order to reduce the envy. Chapter 5 studies optimal nonlinear income tax schedule at symmetric equilibria at which two symmetric states (or tax authorities) compete in order to attract more tax-payers from the opposite. It is different from the existing papers that taxpayers’ wage are endogenously determined by production technology. The optimal tax schedule embraces not only migration effect, but also trickle-down effect coming from endogenous wage, and the migration effect stimulates the trickle-down effect. Compared to previous works, the threat of emigration never disappears in marginal tax rate for highskilled workers because emigration terms are embedded in the production and such factors have impacts on the productivities or their unit wages.