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Server load balancing.

Server load balancing technology has obtained much attention as much business proceeded towards e-commerce. The idea behind is to have set of clustered servers that share the load as against a single server to achieve better performance and throughput. In this problem in lieu of thesis, I propose and evaluate an implementation of a prototype scalable server. The prototype consists of a load-balanced cluster of hosts that collectively accept and service TCP connections. The host IP addresses are… more

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Date: December 2002

Creator: Kanuri, Jaichandra

Item Type: Thesis or Dissertation

Partner: UNT Libraries

A Quality of Service Aware Protocol for Power Conservation in Wireless Ad Hoc and Mobile Networks

Power consumption is an important issue for mobile computers since they rely on the short life of batteries. Conservation techniques are commonly used in hardware design of such systems but network interface is a significant consumer of power, which needs considerable research to be devoted towards designing a low-power design network protocol stack. Due to the dynamic nature of wireless networks, adaptations are necessary to achieve energy efficiency and a reasonable quality of service. This p… more

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Date: December 2002

Creator: Gangidi, Murali

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Probabilistic Analysis of Contracting Ebola Virus Using Contextual Intelligence

The outbreak of the Ebola virus was declared a Public Health Emergency of International Concern by the World Health Organisation (WHO). Due to the complex nature of the outbreak, the Centers for Disease Control and Prevention (CDC) had created interim guidance for monitoring people potentially exposed to Ebola and for evaluating their intended travel and restricting the movements of carriers when needed. Tools to evaluate the risk of individuals and groups of individuals contracting the disease… more

Date: May 2017

Creator: Gopalakrishnan, Arjun

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Comparison of Agent-Oriented Software Engineering Frameworks and Methodologies

Agent-oriented software engineering (AOSE) covers issues on developing systems with software agents. There are many techniques, mostly agent-oriented and object-oriented, ready to be chosen as building blocks to create agent-based systems. There have been several AOSE methodologies proposed intending to show engineers guidelines on how these elements are constituted in having agents achieve the overall system goals. Although these solutions are promising, most of them are designed in ad-hoc man… more

Date: December 2003

Creator: Lin, Chia-En

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Evaluating the Scalability of SDF Single-chip Multiprocessor Architecture Using Automatically Parallelizing Code

Advances in integrated circuit technology continue to provide more and more transistors on a chip. Computer architects are faced with the challenge of finding the best way to translate these resources into high performance. The challenge in the design of next generation CPU (central processing unit) lies not on trying to use up the silicon area, but on finding smart ways to make use of the wealth of transistors now available. In addition, the next generation architecture should offer high throu… more

Date: December 2004

Creator: Zhang, Yuhua

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

FPGA Implementations of Elliptic Curve Cryptography and Tate Pairing over Binary Field

Elliptic curve cryptography (ECC) is an alternative to traditional techniques for public key cryptography. It offers smaller key size without sacrificing security level. Tate pairing is a bilinear map used in identity based cryptography schemes. In a typical elliptic curve cryptosystem, elliptic curve point multiplication is the most computationally expensive component. Similarly, Tate pairing is also quite computationally expensive. Therefore, it is more attractive to implement the ECC and Tat… more

Date: August 2007

Creator: Huang, Jian

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

An Accelerometer-based Gesture Recognition System for a Tactical Communications Application

In modern society, computers are primarily interacted with via keyboards, touch screens, voice recognition, video analysis, and many others. For certain applications, these methods may be the most efficient interface. However, there are applications that we can conceive where a more natural interface could be convenient and connect humans and computers in a more intuitive and natural way. These applications are gesture recognition systems and range from the interpretation of sign language by a … more

Date: December 2015

Creator: Tidwell, Robert S., Jr.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Techniques for Improving Uniformity in Direct Mapped Caches

Directly mapped caches are an attractive option for processor designers as they combine fast lookup times with reduced complexity and area. However, directly-mapped caches are prone to higher miss-rates as there are no candidates for replacement on a cache miss, hence data residing in a cache set would have to be evicted to the next level cache. Another issue that inhibits cache performance is the non-uniformity of accesses exhibited by most applications: some sets are under-utilized while othe… more

Date: May 2011

Creator: Nwachukwu, Izuchukwu Udochi

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Evaluating the Feasibility of Accelerometers in Hand Gestures Recognition

Gesture recognition plays an important role in human computer Interaction for intelligent computing. Major applications like Gaming, Robotics and Automated Homes uses gesture recognition techniques which diminishes the usage of mechanical devices. The main goal of my thesis is to interpret SWAT team gestures using different types of sensors. Accelerometer and flex sensors were explored extensively to build a prototype for soldiers to communicate in the absence of line of sight. Arm movements we… more

Date: December 2014

Creator: Karlaputi, Sarada

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Dynamic WIFI Fingerprinting Indoor Positioning System

A technique is proposed to improve the accuracy of indoor positioning systems based on WIFI radio-frequency signals by using dynamic access points and fingerprints (DAFs). Moreover, an indoor position system that relies solely in DAFs is proposed. The walking pattern of indoor users is classified as dynamic or static for indoor positioning purposes. I demonstrate that the performance of a conventional indoor positioning system that uses static fingerprints can be enhanced by considering dynamic… more

Date: August 2014

Creator: Reyes, Omar Costilla

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Group-EDF: A New Approach and an Efficient Non-Preemptive Algorithm for Soft Real-Time Systems

Hard real-time systems in robotics, space and military missions, and control devices are specified with stringent and critical time constraints. On the other hand, soft real-time applications arising from multimedia, telecommunications, Internet web services, and games are specified with more lenient constraints. Real-time systems can also be distinguished in terms of their implementation into preemptive and non-preemptive systems. In preemptive systems, tasks are often preempted by higher prio… more

Date: August 2006

Creator: Li, Wenming

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Methodical Evaluation of Processing-in-Memory Alternatives

In this work, I characterized a series of potential application kernels using a set of architectural and non-architectural metrics, and performed a comparison of four different alternatives for processing-in-memory cores (PIMs): ARM cores, GPGPUs, coarse-grained reconfigurable dataflow (DF-PIM), and a domain specific architecture using SIMD PIM engine consisting of a series of multiply-accumulate circuits (MACs). For each PIM alternative I investigated how performance and energy efficiency chan… more

Date: May 2019

Creator: Scrbak, Marko

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Autonomic Failure Identification and Diagnosis for Building Dependable Cloud Computing Systems

The increasingly popular cloud-computing paradigm provides on-demand access to computing and storage with the appearance of unlimited resources. Users are given access to a variety of data and software utilities to manage their work. Users rent virtual resources and pay for only what they use. In spite of the many benefits that cloud computing promises, the lack of dependability in shared virtualized infrastructures is a major obstacle for its wider adoption, especially for mission-critical app… more

Date: May 2014

Creator: Guan, Qiang

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Study on Flat-Address-Space Heterogeneous Memory Architectures

In this dissertation, we present a number of studies that primarily focus on data movement challenges among different types of memories (viz., 3D-DRAM, DDRx DRAM and NVM) employed together as a flat-address heterogeneous memory system. We introduce two different hardware-based techniques for prefetching data from slow off-chip phase change memory (PCM) to fast on-chip memories. The prefetching techniques efficiently fetch data from PCM and place that data into processor-resident or 3D-DRAM-resi… more

Date: May 2019

Creator: Islam, Mahzabeen

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Adaptive Power Management for Autonomic Resource Configuration in Large-scale Computer Systems

In order to run and manage resource-intensive high-performance applications, large-scale computing and storage platforms have been evolving rapidly in various domains in both academia and industry. The energy expenditure consumed to operate and maintain these cloud computing infrastructures is a major factor to influence the overall profit and efficiency for most cloud service providers. Moreover, considering the mitigation of environmental damage from excessive carbon dioxide emission, the amo… more

Date: August 2015

Creator: Zhang, Ziming

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

SEM Predicting Success of Student Global Software Development Teams

The extensive use of global teams to develop software has prompted researchers to investigate various factors that can enhance a team’s performance. While a significant body of research exists on global software teams, previous research has not fully explored the interrelationships and collective impact of various factors on team performance. This study explored a model that added the characteristics of a team’s culture, ability, communication frequencies, response rates, and linguistic catego… more

Date: May 2015

Creator: Brooks, Ian Robert

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Secure and Energy Efficient Execution Frameworks Using Virtualization and Light-weight Cryptographic Components

Security is a primary concern in this era of pervasive computing. Hardware based security mechanisms facilitate the construction of trustworthy secure systems; however, existing hardware security approaches require modifications to the micro-architecture of the processor and such changes are extremely time consuming and expensive to test and implement. Additionally, they incorporate cryptographic security mechanisms that are computationally intensive and account for excessive energy consumption… more

Date: August 2014

Creator: Nimgaonkar, Satyajeet

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

High Performance Architecture using Speculative Threads and Dynamic Memory Management Hardware

With the advances in very large scale integration (VLSI) technology, hundreds of billions of transistors can be packed into a single chip. With the increased hardware budget, how to take advantage of available hardware resources becomes an important research area. Some researchers have shifted from control flow Von-Neumann architecture back to dataflow architecture again in order to explore scalable architectures leading to multi-core systems with several hundreds of processing elements. In thi… more

Date: December 2007

Creator: Li, Wentong

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Intelligent Memory Manager: Towards improving the locality behavior of allocation-intensive applications.

Dynamic memory management required by allocation-intensive (i.e., Object Oriented and linked data structured) applications has led to a large number of research trends. Memory performance due to the cache misses in these applications continues to lag in terms of execution cycles as ever increasing CPU-Memory speed gap continues to grow. Sophisticated prefetcing techniques, data relocations, and multithreaded architectures have tried to address memory latency. These techniques are not completely… more

Date: May 2004

Creator: Rezaei, Mehran

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Split array and scalar data cache: A comprehensive study of data cache organization.

Existing cache organization suffers from the inability to distinguish different types of localities, and non-selectively cache all data rather than making any attempt to take special advantage of the locality type. This causes unnecessary movement of data among the levels of the memory hierarchy and increases in miss ratio. In this dissertation I propose a split data cache architecture that will group memory accesses as scalar or array references according to their inherent locality and will su… more

Date: August 2007

Creator: Naz, Afrin

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Performance Engineering of Software Web Services and Distributed Software Systems

The promise of service oriented computing, and the availability of Web services promote the delivery and creation of new services based on existing services, in order to meet new demands and new markets. As Web and internet based services move into Clouds, inter-dependency of services and their complexity will increase substantially. There are standards and frameworks for specifying and composing Web Services based on functional properties. However, mechanisms to individually address non-functi… more

Date: May 2014

Creator: Lin, Chia-En

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Framework for Evaluating Dynamic Memory Allocators Including a New Equivalence Class Based Cache-conscious Allocator

Software applications’ performance is hindered by a variety of factors, but most notably by the well-known CPU-memory speed gap (often known as the memory wall). This results in the CPU sitting idle waiting for data to be brought from memory to processor caches. The addressing used by caches cause non-uniform accesses to various cache sets. The non-uniformity is due to several reasons, including how different objects are accessed by the code and how the data objects are located in memory. Memor… more

Date: August 2013

Creator: Janjusic, Tomislav

Item Type: Thesis or Dissertation

Partner: UNT Libraries