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Bootstrapping Cognitive Radio Networks
Title
Bootstrapping Cognitive Radio Networks.
Creator
Horine, Brent, Turgut, Damla, Wei, Lei, Boloni, Ladislau, Sukthankar, Gita, Garibay, Ivan, University of Central Florida
Abstract / Description
Cognitive radio networks promise more efficient spectrum utilization by leveraging degrees of freedom and distributing data collection. The actual realization of these promises is challenged by distributed control, and incomplete, uncertain and possibly conflicting knowledge bases. We consider two problems in bootstrapping, evolving, and managing cognitive radio networks. The first is Link Rendezvous, or how separate radio nodes initially find each other in a spectrum band with many degrees...
Show moreCognitive radio networks promise more efficient spectrum utilization by leveraging degrees of freedom and distributing data collection. The actual realization of these promises is challenged by distributed control, and incomplete, uncertain and possibly conflicting knowledge bases. We consider two problems in bootstrapping, evolving, and managing cognitive radio networks. The first is Link Rendezvous, or how separate radio nodes initially find each other in a spectrum band with many degrees of freedom, and little shared knowledge. The second is how radio nodes can negotiate for spectrum access with incomplete information.To address the first problem, we present our Frequency Parallel Blind Link Rendezvous algorithm. This approach, designed for recent generations of digital front-ends, implicitly shares vague information about spectrum occupancy early in the process, speeding the progress towards a solution. Furthermore, it operates in the frequency domain, facilitating a parallel channel rendezvous. Finally, it operates without a control channel and can rendezvous anywhere in the operating band. We present simulations and analysis on the false alarm rate for both a feature detector and a cross-correlation detector. We compare our results to the conventional frequency hopping sequence rendezvous techniques.To address the second problem, we model the network as a multi-agent system and negotiate by exchanging proposals, augmented with arguments. These arguments include information about priority status and the existence of other nodes. We show in a variety of network topologies that this process leads to solutions not otherwise apparent to individual nodes, and achieves superior network throughput, request satisfaction, and total number of connections, compared to our baselines. The agents independently formulate proposals based upon communication desires, evaluate these proposals based upon capacity constraints, create arguments in response to proposal rejections, and re-evaluate proposals based upon received arguments. We present our negotiation rules, messages, and protocol and demonstrate how they interoperate in a simulation environment.
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Date Issued
2012
Identifier
CFE0004546, ucf:49240
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004546
SPATIO-TEMPORAL NEGOTIATION PROTOCOLS
Title
SPATIO-TEMPORAL NEGOTIATION PROTOCOLS.
Creator
Luo, Yi, Boloni, Ladislau, University of Central Florida
Abstract / Description
Canonical problems are simplified representations of a class of real world problems. They allow researchers to compare algorithms in a standard setting which captures the most important challenges of the real world problems being modeled. In this dissertation, we focus on negotiating a collaboration in space and time, a problem with many important real world applications. Although technically a multi-issue negotiation, we show that the problem can not be represented in a satisfactory manner...
Show moreCanonical problems are simplified representations of a class of real world problems. They allow researchers to compare algorithms in a standard setting which captures the most important challenges of the real world problems being modeled. In this dissertation, we focus on negotiating a collaboration in space and time, a problem with many important real world applications. Although technically a multi-issue negotiation, we show that the problem can not be represented in a satisfactory manner by previous models. We propose the "Children in the Rectangular Forest" (CRF) model as a possible canonical problem for negotiating spatio-temporal collaboration. In the CRF problem, two embodied agents are negotiating the synchronization of their movement for a portion of the path from their respective sources to destinations. The negotiation setting is zero initial knowledge and it happens in physical time. As equilibrium strategies are not practically possible, we are interested in strategies with bounded rationality, which achieve good erformance in a wide range of practical negotiation scenarios. We design a number of negotiation protocols to allow agents to exchange their offers. The simple negotiation protocol can be enhanced by schemes in which the agents add additional information of the negotiation flow to aid the negotiation partner in offer formation. Naturally, the performance of a strategy is dependent on the strategy of the opponent and the characteristics of the scenario. Thus we develop a set of metrics for the negotiation scenario which formalizes our intuition of collaborative scenarios (where the agents' interests are closely aligned) versus competitive scenarios (where the gain of the utility for one agent is paid off with a loss of utility for the other agent). Finally, we further investigate the sophisticated strategies which allow agents to learn the opponents while negotiating. We find strategies can be augmented by collaborativeness analysis: the approximate collaborativeness metric can be used to cut short the negotiation. Then, we discover an approach to model the opponent through Bayesian learning. We assume the agents do not disclose their information voluntarily: the learning needs to rely on the study of the offers exchanged during normal negotiation. At last, we explore a setting where the agents are able to perform physical action (movement) while the negotiation is ongoing. We formalize a method to represent and update the beliefs about the valuation function, the current state of negotiation and strategy of the opponent agent using a particle filter. By exploring a number of different negotiation protocols and several peer-to-peer negotiation based strategies, we claim that the CRF problem captures the main challenges of the real world problems while allows us to simplify away some of the computationally demanding but semantically marginal features of real world problems.
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Date Issued
2011
Identifier
CFE0003722, ucf:48782
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0003722
A STUDY OF PUBLIC EMPLOYEE LABOR LAW IN THE UNITED STATES
Title
A STUDY OF PUBLIC EMPLOYEE LABOR LAW IN THE UNITED STATES.
Creator
Bula, Oleh, Murray, Kenneth, University of Central Florida
Abstract / Description
This study examined the legal issues of public employee labor relations in the United States. Included in this study is a review of relevant case law as it pertains to collective bargaining in the public sector. In addition to reviewing the case law, this study researched the statutory language of each state for public sector collective bargaining. The study includes a review, analysis, and summary of the state and federal laws for public sector collective bargaining. The collective...
Show moreThis study examined the legal issues of public employee labor relations in the United States. Included in this study is a review of relevant case law as it pertains to collective bargaining in the public sector. In addition to reviewing the case law, this study researched the statutory language of each state for public sector collective bargaining. The study includes a review, analysis, and summary of the state and federal laws for public sector collective bargaining. The collective bargaining process in the United States is designed to resolve disputes between two parties, the employer and the employee. The resolution of these disputes often depends on the relative bargaining power of each party. The private sector has a collective bargaining process that has been well established since the passage of the National Labor Relations Act in 1935 and the Labor-Management Relations Act of 1947. The federal laws that have been implemented in the last fifty years, to include the Civil Rights Act of 1964, the Equal Employment Opportunity Act of 1972, the American with Disabilities Act of 1990, among others, cover the scope of almost all of the private sector collective bargaining (Oberer, 1994). The public sector contains 50 different state laws and several federal laws defining the scope of collective bargaining for public employees. The bargaining process in the public sector takes place in the context of the political arena. This political influence, which is unique in each state and at each level of government, provides additional steps to the bargaining process that further differentiate public sector bargaining from private (Valletta, 1985). This study provides conclusions on certain aspects of public sector collective bargaining that lead to dispute resolution and contract negotiation to include fact-finding procedures, mediation, arbitration, and strike policies, in the current state of the law. Recommendations are made to public officials, policy makers, and other stakeholders for the future of public employee labor relations in the United States.
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Date Issued
2005
Identifier
CFE0000353, ucf:46293
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0000353
IRAN-SAUDI DYNAMIC RELATIONS AND THE ROLE OF OMAN AS A NEGOTIATOR
Title
IRAN-SAUDI DYNAMIC RELATIONS AND THE ROLE OF OMAN AS A NEGOTIATOR.
Creator
Ikerd, Natalie, Sadri, Houman, University of Central Florida
Abstract / Description
This thesis analyzes Iran-Saudi relations in the context of growing regional hostility. This research encompasses the domestic and foreign policies enacted by both states since 1979, accompanying a discussion of the historical background of their ties. Moreover, the future prospects of their relations regarding the utilization of Oman as a neutral negotiator for regional conflicts are examined. The significant contributing factors of each state to such dynamic ties include: the leadership,...
Show moreThis thesis analyzes Iran-Saudi relations in the context of growing regional hostility. This research encompasses the domestic and foreign policies enacted by both states since 1979, accompanying a discussion of the historical background of their ties. Moreover, the future prospects of their relations regarding the utilization of Oman as a neutral negotiator for regional conflicts are examined. The significant contributing factors of each state to such dynamic ties include: the leadership, national security, religion- politics connection, and their reaction to global instability indicators. Recently, Iran- Saudi hostility has been worsening due to their policies in the region in reaction to regional events. Thus, some may argue that the outlook of success for Omani role in negotiating between the two is seemingly less likely. The relations of these two Persian Gulf regional powers need to be examined further for future prospects.
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Date Issued
2015
Identifier
CFH0004900, ucf:45492
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004900
VIRTUAL HOOD: EXPLORING THE HIP-HOP CULTURE EXPERIENCE IN A BRITISH ONLINE COMMUNITY.
Title
VIRTUAL HOOD: EXPLORING THE HIP-HOP CULTURE EXPERIENCE IN A BRITISH ONLINE COMMUNITY.
Creator
Cherjovsky, Natalia, Grajeda, Anthony, University of Central Florida
Abstract / Description
In this fast-paced, globalized world, certain online sites represent a hybrid personal-public sphere–where like-minded people commune regardless of physical distance, time difference, or lack of synchronicity. Sites that feature chat rooms and forums can offer a deep-rooted sense of community and facilitate the forging of relationships and cultivation of ideologies. This dissertation investigates whether this trend is relevant to web sites concerning hip-hop. This...
Show moreIn this fast-paced, globalized world, certain online sites represent a hybrid personal-public sphere–where like-minded people commune regardless of physical distance, time difference, or lack of synchronicity. Sites that feature chat rooms and forums can offer a deep-rooted sense of community and facilitate the forging of relationships and cultivation of ideologies. This dissertation investigates whether this trend is relevant to web sites concerning hip-hop. This genre is arguably one of the most pervasive and influential global cultural forms, yet it is markedly different from most other forms of globalized culture because it emerged within and is still embedded in a distinct subculture. The notion that the Internet could become a bastion for hip-hop fans is quite paradoxical: hip hop is a cultural form so deeply rooted in the sense of place and so invested in its relationship to spatiality that it could potentially pose a particular challenge to the notion of virtual communities. This research examines the virtual hip-hop experience in the UK in order to assess whether this music and the culture that surrounds it have been adopted in their original American form or whether they have been adapted to make them more relevant to their new locale. In particular, the study probes how the ideology, values, behaviors and attitudes that bestride American hip-hop are represented, consumed, and reproduced on the mediated world of web sites.
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Date Issued
2010
Identifier
CFE0003029, ucf:52843
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0003029