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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Clustering is an essential data mining tool that aims to discover inherent cluster structure in data. As such, the study of clusterability, which evaluates whether data possesses such structure, is an integral part of cluster analysis....
This thesis presents a new architecture for improving the interactivity and responsiveness of massively multiplayer on-line games. In order to aide in the quick delivery of game updates generated by a game client, this thesis presents a...
Conditional branches have traditionally been a performance bottleneck for most processors. The high frequency of branches in code coupled with expensive pipeline flushes on mispredictions make branches expensive instructions worth...
The task of protecting software integrity can be approached with a two-part strategy that addresses threats to the static integrity of memory contents and the dynamic integrity of software memory interactions. Although their resultant...
Vehicular wireless networks are gaining commercial interest. Mobile connectivity, road safety, and traffic congestion management are some applications that have arisen with this networking paradigm. Existing research primarily focuses on...
When considering computer processors, there is a trade-off between performance and power; improved performance does not typically come without an increase in power. Similarly, the reduction of power often times means a reduction in...
My thesis is that a realistic image of a human face can be generated using a computational simulation of light transport. I demonstrate this thesis by acquiring the three-dimensional geometry of a face, measuring the reflectance function...
One of the main goals of robotics research is to give physical platforms intelligence, allowing for the platforms to act autonomously with minimal direction from humans. Motion planning is the process by which a mobile robot plans a...
In recent years, studies have shown that independent/sparse components of local windows of natural images resemble the receptive fields of cells in the early stages of the mammalian visual pathway. However, the role of the independence...
Mobile platforms have become ubiquitous in our society; however, classical benchmarks have not kept up with their growth. When not entirely incompatible, current benchmarking techniques often provide very little useful information about...
In recent years, the need to reduce the power and energy requirements of computer microprocessors has increased dramatically. In the past, microprocessor architects succeeded in improving the performance of their designs by increasing...
Instruction fetch is an important pipeline stage for embedded processors, as it can consume a significant fraction of the total processor energy. This dissertation describes the design and implementation of two new fetch enhancements...
With the advancement information and communication technologies, networked computing devices have been adopted to address real-world challenges due to their efficiency and programmability while maintaining scalability, sustainability, ...
Many contemporary disk drives have built-in queues and schedulers. These features can improve I/O performance, by offloading work from the system's main processor, avoiding disk idle time, and taking advantage of vendor-specific disk...
Existing solutions that address data loss, theft, and corruption of information and resources in networks rely on deep content analysis, central policy management, and attempt to achieve broad content protection across multiple platforms...
High spatial variability has been observed in simple fuelbeds (Keane et al.2012, Hiers et al. 2009) which accentuates the need to describe the actual fuel arrangement and composition of fuels in a prescribed or wildfire operation setting...
Malware has crippled computer systems, caused financial losses on the order of billions of dollars and denied access to services for millions of users worldwide. Detecting malware before it can cause any damage, therefore, is a...
Researchers agree that protecting a stand-alone autonomous mobile agent with software-only approaches remains difficult. In this thesis, we produce several results that enhance mobile agent security and provide generalized code...
Network of unmanned vehicles, are poised to be the next giant leap of technology. Such systems are already being used by the defense and law enforcement agencies. The US DoD and some very large private corporations are spending large...
In many multi-user cryptographic applications (e.g., electronic voting, digital lotteries, e-cash application, anonymous access to some resources, etc.), anonymity pops up as one of the main security objectives. Protecting private...
Monte Carlo (MC) linear solvers are fundamentally based on the ability to estimate a matrix-vector product, using a random sampling process. They use the fact that deterministic stationary iterative processes to solve linear systems can...
This thesis describes the support provided in VISTA for finding effective sequences of optimization phases. VISTA is a software tool for a compiler which supports an interactive compilation paradigm. It has long been known that a single...
Performance modeling and simulation of parallel applications are critical performance analysis techniques in High Performance Computing (HPC). Efficient and accurate performance modeling and simulation can aid the tuning and optimization...
DNA is the fundamental storage for the genetic "blueprints" of all living organisms. It provides the information used to create the functional proteins in an organism. One of the key factors regulating the use of this blueprint is the...
The study of user-behavior and decision-making dynamics in transportation network are vital in modeling and simulation of user interactions. Different users access transportation network in order to accomplish different activities. Such...
Wireless sensor networks are undoubtedly one of the largest growing types of networks today. Much research has been done to make these networks operate more efficiently including the application of data aggregation. Recently, more...
This thesis is composed of two parts. Part one is on Appearance-Based Classification and Recognition Using Spectral Histogram Representations. We present a unified method for appearance-based applications including texture classification...
Passwords are critical for security in many different domains such as social networks, emails, encryption of sensitive data and online banking. Human memorable passwords are thus a key element in the security of such systems. It is...
The presence of data dependences between statements in a loop iteration space imposes strict constraints on statement order and loop restructuring when preserving program semantics. A compiler determines the safe partial ordering of...
This report shall discuss the threats to information and services in open systems. In it we shall provide an illustration where these threats are confronted, describe the three basic techniques of authentication, and comment on the...
Estimating normals for 3D point clouds and reconstructing a surface interpolating the points are important problems in Computational Geometry and Computer Graphics. Massive point clouds and surfaces with sharp features are active areas...
Bayesian inference with Bayesian networks is a #P-complete problem in general. Exact Bayesian inference is feasible in practice only on small-scale Bayesian networks or networks that are dramatically simplified, such as with naive Bayes...
In this dissertation we study the security and survivability of wireless mobile network systems in two distinct threat models: the Byzantine threat model and the sel¯sh node threat model. Wireless mobile networks are collections of self...
Molecular Dynamics (MD) is an important simulation technique with widespread use in computational chemistry, biology, and materials. An important limitation of MD is that the time step size is limited to around a femto (10-15) second....
This thesis presents the efforts made to develop new tools for non-technical law enforcement agents to effectively respond to electronic crimes. We present two tools: one that combats online predators and cyber-stalking; and a second...
Supercomputers play an essential role in performing computationally intensive tasks in various scientific fields. As supercomputers move toward the next milestone in computing power, exascale computing, interconnection networks become a...
This thesis describes an architectural visualization tool developed to illustrate the instruction flow in a modern processor pipeline simulation. It was designed to aid in better understanding the complexities of a modern pipeline design...
Autonomous robots are increasingly working alongside humans in a variety of environments. While simple applications in controlled environments work fine with fully autonomous robots and little interaction between human and robot, mission...
The use of fat-tree topologies is a popular choice for high performance computing systems. Good routing algorithms are crucial to exploiting the high connectivity of the fat-tree topology. My research considers a family of fat-tree...
The rising number of senior citizens is approaching an all time high. With this comes a rising number of common chronic conditions where treatment is costly and time consuming. Frequently these conditions make it unsafe for older adults...
This thesis describes the Language Abstraction for Rule-based Knowledge-systems (LARK) Engine. The goal of this engine is to process various expert system rulesets and generate the required semantics for multiple production systems –...
Passwords are still one of the most common means of securing computer systems. Most organizations rely on password authentication systems, and therefore, it is very important for them to enforce their users to have strong passwords. They...
As the complexity requirements for embedded applications increase, the performance demands of embedded compilers also increase. Compiler optimizations, such as software pipelining and recurrence elimination, can significantly reduce...
Low-rank matrix approximation is extremely useful in the analysis of data that arises in scientific computing, engineering applications, and data science. However, as data sizes grow, traditional low-rank matrix approximation methods, ...
The Internet is composed of tens of thousands of network domains or Autonomous Systems (ASes), and Border Gateway Protocol (BGP) is the current de facto inter-domain routing protocol used by network domains to exchange reach ability of...
Using traditional methodologies and tools, the problem of keeping performance-critical kernels at high efficiency on hardware evolving at the incredible rates dictated by Moore's Law is almost intractable. On product lines where ISA...
This thesis is intended to cover two of the most basic, important and highly applied multiple access communication techniques in modern age. It will provide an in-depth literature on the history, evolution, present and future of FDMA ...
The digital revolution, fired by the development of the information and communication technologies, has fundamentally changed the way we think, behave, communicate, work and earn livelihood (the World Summit on the Information Society)....
In all areas of research, finding the correct limiting factor able to provide the largest gains can often be the critical path of the research itself. In our work, focusing on branch prediction, we attempt to discover in what ways did...
This thesis presents and evaluates a new algorithm which generates random numbers. The algorithm uses a Number Theory class of numbers called Normal Numbers. Normal Numbers consist of an infinite sequence of digits which are uniformly...
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