The Internet has become a vital and essential part of modern everyday life. Services delivered by the Internet are used by people across the planet every moment of every day of the year. The Internet has proven a positive force for good improving the lives of billions of people worldwide. The power of the Internet to deliver this positive good to humanity relies on its ability to deliver life improving services. In my doctorate work culminating in this dissertation I have striven to sustain and increase the Internet's ability to deliver these services and to have a positive good effect upon humanity.

The overarching purpose of this dissertation is to improve the Internet's ability to deliver life improving services. I have further divided this purpose into two goals. To improve the ability of applications operating in challenging network conditions to gain their fair share of the bandwidth resources and to reduce the delay with which these services are delivered. Every service delivered by the Internet consists of Internet objects that are delivered through communication paths across the Internet. The delivery of these objects is defined by the two characteristics; Throughput and delay. Throughput determines how much of an object can be delivered over a period of time and delay determines how long it takes to deliver an object.

These two characteristics determine the Internet's ability to deliver objects across communication paths. Improving these two characteristics (bandwidth and delay) increase the ability of the Internet to deliver objects and thus improve the Internet's capability to deliver life improving services. To accomplish this goal I present projects along three areas of effort. These three areas of effort are: (1) Increase the ability of applications operating in challenging conditions to achieve their fair share of bandwidth. (2) Synthesize knowledge required to address the effort to reduce delay. (3) Develop protocols that reduce delay encountered in the communications paths of the Internet.

In this dissertation I present projects along these three areas of effort that accomplish the two goals (increase bandwidth and reduce delay) to achieve the purpose of improving the Internet's ability to deliver essential and life improving services. These projects and their organization into areas of effort, goals and purpose are my contributions to the networking sciences.

Incorporating a significant amount of technology into a classroom is an important, but extremely difficult task. In this paper we describe the next generation of the UCSB digital classroom, called the Collaborative Technologies Lab (CTL). The primary goal of the CTL is to investigate the challenges of deploying technology for technology's sake. We feel that without the ability to deploy a large amount of technology and offer robust functionality, the whole idea of enhanced learning environments becomes marginalized. Therefore, it is critical to understand the challenges of deeply embedding technology in a classroom. Based on experience in building and using the CTL, in this paper we propose a demarcation point between program production and content encoding. This demarcation point offers the advantage of breaking a large technical problem into smaller, easier-to-solve problems. The demarcation point also has the advantage of being able to separate complex functions along common lines of expertise. One skilled in production need not worry about the technology of the encoding systems and one skilled in technology need not worry about the ascetics of program production

As the wireless medium has become the primary source of communication and Internet connectivity, and as devices and wireless technologies become more sophisticated and capable, there has been a surge in the capacity demands and complexity of applications that run over these wireless devices. To sustain the volume and QoE guarantees of the data generated, the opportunity and need to rethink wireless network design across all the layers of the protocol stack has firmly emerged as a solution to enable the timely and reliable delivery of data, while handling the inherent challenges of a crowded wireless medium, such as congestion, interference, and hidden terminals.

The research work presented in this dissertation builds efficient solutions and protocols with a theoretical foundation to address the challenges that arise in rethinking wireless network design. Example challenges include managing the overhead associated with complex systems. My work particularly focuses on the opportunities and challenges of sophisticated technology and systems in emerging wireless networks. I target the main thrusts in the evolution of wireless networks that create significant opportunity to achieve higher theoretical capacity, and have direct implications on our day-to-day wireless interactions: from enabling multifold increase in capacity in wireless physical links, to developing medium access techniques to exploit the high speed links, and making the applications more bandwidth efficient. I build deployable, and resource-aware wireless systems that exploit higher bandwidths by leveraging and advancing diverse research areas such as theory, analysis, protocol design, and wireless networking. Specifically, I identify the erroneous assumptions and fundamental limitations of existing solutions in capturing the true and complex interactions between wireless devices and protocols. I use these insights to guide practical and efficient protocol design, followed by thorough analysis and evaluation in testbed implementations via prototypes and measurements. I show that my proposed solutions achieve significant performance gains, at minimum cost to overhead.

Reputation systems help peers decide whom to trust before undertaking a transaction. Conventional approaches to reputation-based trust modeling assume that peers reputed to provide trustworthy service are also likely to provide trustworthy feedback. By basing the credibility of a peer's feedback on its reputation as a transactor, these models become vulnerable to malicious nodes that provide good service to badmouth targeted nodes. We propose to decouple a peer's reputation as a service provider from its reputation as a service recommender, making the reputation more robust to malicious peers. We show via simulations that a decoupled approach greatly enhances the accuracy of reputations generated, resulting in fewer malicious transactions, false positives, and false negatives.

College students exploit information technology to cheat on papers and assignments, but for the most part university faculty employ few technological techniques to detect cheating. This paper reports on a trial of software for the detection of cheating in a large undergraduate survey class. The paper discusses the decision to adopt electronic means for screening student papers, the techniques used, the outcome, strategic concerns regarding deterrence versus detection of cheating, and the results of a survey of student attitudes about the experience. The paper advances the thesis that easily-adopted techniques not only close a sophistication gap associated with computerized cheating, but can place faculty in a stronger position than they have ever enjoyed historically with regard to the deterrence and detection of some classes of plagiarism.

As more universities and research institutions develop digital classrooms, a common theme is arising: the need to manage complexity. As more technology is added to a classroom in order to facilitate the presentation, transmission and recording of digital media, the complexity of the environment increases dramatically. By planning the design and implementation of a digital classroom with a strong focus on managing complexity from the beginning, it should be possible to deploy a highly functional classroom environment that employs advanced technology while at the same time managing the inherent complexity in such a way as to reduce the barriers to use. In this paper, we will examine how complexity arises within four specific areas: audio engineering, video production, encoding/decoding, and administration. We then present a list of solutions and conclude with an overview of what we have learned in the deployment of our own digital classroom, the Collaborative Technology Laboratory (CTL).

The future of technology on the university campus has reached a critical juncture. In this paper we propose eight areas in which substantial changes in university education may be at hand: Students, Instructional Design and Pedagogic Techniques, Teachers and the Institutional Setting, New Forms of Content and Exchange, Intellectual Property, Infrastructure, Power and Data, Support, and Security & Backup. It is our determination that leadership must play a critical role in the equation, not only to implement technological developments but also to plan adequately for long-term changes. We conclude with eight hypotheses about technology and learning in the University intended to be provocative and to stimulate discussion and analysis.