UNT Libraries - 55 Matching Results

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Impact of actual interference on capacity and call admission control in a CDMA network.

Description: An overwhelming number of models in the literature use average inter-cell interference for the calculation of capacity of a Code Division Multiple Access (CDMA) network. The advantage gained in terms of simplicity by using such models comes at the cost of rendering the exact location of a user within a cell irrelevant. We calculate the actual per-user interference and analyze the effect of user-distribution within a cell on the capacity of a CDMA network. We show that even though the capacity o… more
Date: May 2004
Creator: Parvez, Asad
Item Type: Refine your search to only Thesis or Dissertation

Improved Approximation Algorithms for Geometric Packing Problems With Experimental Evaluation

Description: Geometric packing problems are NP-complete problems that arise in VLSI design. In this thesis, we present two novel algorithms using dynamic programming to compute exactly the maximum number of k x k squares of unit size that can be packed without overlap into a given n x m grid. The first algorithm was implemented and ran successfully on problems of large input up to 1,000,000 nodes for different values. A heuristic based on the second algorithm is implemented. This heuristic is fast in p… more
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Date: December 2003
Creator: Song, Yongqiang
Item Type: Refine your search to only Thesis or Dissertation
open access

Information Storage and Retrieval Systems

Description: This thesis describes the implementation of a general purpose personal information storage and retrieval system. Chapter one contains an introduction to information storage and retrieval. Chapter two contains a description of the features a useful personal information retrieval system should contain. This description forms the basis for the implementation of the personal information storage and retrieval system described in chapter three. The system is implemented in UCSD Pascal on an Apple II … more
Date: May 1983
Creator: Creech, Teresa Adams
Item Type: Refine your search to only Thesis or Dissertation
open access

Intelligent Memory Management Heuristics

Description: Automatic memory management is crucial in implementation of runtime systems even though it induces a significant computational overhead. In this thesis I explore the use of statistical properties of the directed graph describing the set of live data to decide between garbage collection and heap expansion in a memory management algorithm combining the dynamic array represented heaps with a mark and sweep garbage collector to enhance its performance. The sampling method predicting the density an… more
Date: December 2003
Creator: Panthulu, Pradeep
Item Type: Refine your search to only Thesis or Dissertation
open access

An Interpreter for the Basic Programming Language

Description: In this thesis, the first chapter provides the general description of this interpreter. The second chapter contains a formal definition of the syntax of BASIC along with an introduction to the semantics. The third chapter contains the design of data structure. The fourth chapter contains the description of algorithms along with stages for testing the interpreter and the design of debug output. The stages and actions-are represented internally to the computer in tabular forms. For statement pars… more
Date: May 1975
Creator: Chang, Min-Jye S.
Item Type: Refine your search to only Thesis or Dissertation
open access

Intrinsic and Extrinsic Adaptation in a Simulated Combat Environment

Description: Genetic algorithm and artificial life techniques are applied to the development of challenging and interesting opponents in a combat-based computer game. Computer simulations are carried out against an idealized human player to gather data on the effectiveness of the computer generated opponents.
Date: May 1995
Creator: Dombrowsky, Steven P. (Steven Paul)
Item Type: Refine your search to only Thesis or Dissertation
open access

A Left-to-Right Parsing Algorithm for THIS Programming Language

Description: The subject of this investigation is a specific set of parsers known as LR parsers. Of primary interest is a LR parsing method developed by DeRemer which specifies a translation method which can be defined by a Deterministic Push-Down Automation (DPDA). The method of investigation was to apply DeRemer's parsing technique to a specific language known as THIS Programming Language (TPL). The syntax of TPL was redefined as state diagrams and these state diagrams were, in turn, encoded into two tab… more
Date: May 1976
Creator: Hooker, David P.
Item Type: Refine your search to only Thesis or Dissertation
open access

Linear Unification

Description: Efficient unification is considered within the context of logic programming. Unification is explained in terms of equivalence classes made up of terms, where there is a constraint that no equivalence class may contain more than one function term. It is demonstrated that several well-known "efficient" but nonlinear unification algorithms continually maintain the said constraint as a consequence of their choice of data structure for representing equivalence classes. The linearity of the Paterson-… more
Date: December 1989
Creator: Wilbanks, John W. (John Winston)
Item Type: Refine your search to only Thesis or Dissertation
open access

Modeling Complex Forest Ecology in a Parallel Computing Infrastructure

Description: Effective stewardship of forest ecosystems make it imperative to measure, monitor, and predict the dynamic changes of forest ecology. Measuring and monitoring provides us a picture of a forest's current state and the necessary data to formulate models for prediction. However, societal and natural events alter the course of a forest's development. A simulation environment that takes into account these events will facilitate forest management. In this thesis, we describe an efficient parallel imp… more
Date: August 2003
Creator: Mayes, John
Item Type: Refine your search to only Thesis or Dissertation
open access

Modeling the Impact and Intervention of a Sexually Transmitted Disease: Human Papilloma Virus

Description: Many human papilloma virus (HPV) types are sexually transmitted and HPV DNA types 16, 18, 31, and 45 account for more than 75% if all cervical dysplasia. Candidate vaccines are successfully completing US Federal Drug Agency (FDA) phase III testing and several drug companies are in licensing arbitration. Once this vaccine become available it is unlikely that 100% vaccination coverage will be probable; hence, the need for vaccination strategies that will have the greatest reduction on the endem… more
Date: May 2006
Creator: Corley, Courtney D.
Item Type: Refine your search to only Thesis or Dissertation

Multi-Agent Architecture for Internet Information Extraction and Visualization

Description: The World Wide Web is one of the largest sources of information; more and more applications are being developed daily to make use of this information. This thesis presents a multi-agent architecture that deals with some of the issues related to Internet data extraction. The primary issue addresses the reliable, efficient and quick extraction of data through the use of HTTP performance monitoring agents. A second issue focuses on how to make use of available data to take decisions and alert the … more
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Date: August 2000
Creator: Gollapally, Devender R.
Item Type: Refine your search to only Thesis or Dissertation
open access

The Multipath Fault-Tolerant Protocol for Routing in Packet-Switched Communication Network

Description: In order to provide improved service quality to applications, networks need to address the need for reliability of data delivery. Reliability can be improved by incorporating fault tolerance into network routing, wherein a set of multiple routes are used for routing between a given source and destination. This thesis proposes a new fault-tolerant protocol, called the Multipath Fault Tolerant Protocol for Routing (MFTPR), to improve the reliability of network routing services. The protocol is ba… more
Date: May 2003
Creator: Krishnan, Anupama
Item Type: Refine your search to only Thesis or Dissertation
open access

A Neural Network Configuration Compiler Based on the Adaptrode Neuronal Model

Description: A useful compiler has been designed that takes a high level neural network specification and constructs a low level configuration file explicitly specifying all network parameters and connections. The neural network model for which this compiler was designed is the adaptrode neuronal model, and the configuration file created can be used by the Adnet simulation engine to perform network experiments. The specification language is very flexible and provides a general framework from which almost an… more
Date: December 1992
Creator: McMichael, Lonny D. (Lonny Dean)
Item Type: Refine your search to only Thesis or Dissertation
open access

The Object-Oriented Database Editor

Description: Because of an interest in object-oriented database systems, designers have created systems to store and manipulate specific sets of abstract data types that belong to the real world environment they represent. Unfortunately, the advantage of these systems is also a disadvantage since no single object-oriented database system can be used for all applications. This paper describes an object-oriented database management system called the Object-oriented Database Editor (ODE) which overcomes this d… more
Date: December 1989
Creator: Coats, Sidney M. (Sidney Mark)
Item Type: Refine your search to only Thesis or Dissertation
open access

A Parallel Programming Language

Description: The problem of programming a parallel processor is discussed. Previous methods of programming a parallel processor, analyzing a program for parallel paths, and special language features are discussed. Graph theory is used to define the three basic programming constructs: choice, sequence, repetition. The concept of mechanized programming is expanded to allow for total separation of control and computational sections of a program. A definition of a language is presented which provides for this s… more
Date: May 1979
Creator: Cox, Richard D.
Item Type: Refine your search to only Thesis or Dissertation
open access

Performance comparison of data distribution management strategies in large-scale distributed simulation.

Description: Data distribution management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large-scale distributed simulations. The key to efficient DDM is to limit and control the volume of data exchanged during the simulation, to relay data to only those hosts requiring the data. This thesis focuses upon different DDM implementations and strategies. This thesis includes analysis of three DDM methods i… more
Date: May 2004
Creator: Dzermajko, Caron
Item Type: Refine your search to only Thesis or Dissertation

Performance Evaluation of Data Integrity Mechanisms for Mobile Agents

Description: With the growing popularity of e-commerce applications that use software agents, the protection of mobile agent data has become imperative. To that end, the performance of four methods that protect the data integrity of mobile agents is evaluated. The methods investigated include existing approaches known as the Partial Result Authentication Codes, Hash Chaining, and Set Authentication Code methods, and a technique of our own design, called the Modified Set Authentication Code method, which add… more
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Date: December 2003
Creator: Gunupudi, Vandana
Item Type: Refine your search to only Thesis or Dissertation
open access

A Programming Language For Concurrent Processing

Description: This thesis is a proposed solution to the problem of including an effective interrupt mechanism in the set of concurrent- processing primitives of a block-structured programming language or system. The proposed solution is presented in the form of a programming language definition and model. The language is called TRIPLE.
Date: August 1972
Creator: Jackson, Portia M.
Item Type: Refine your search to only Thesis or Dissertation

Resource Allocation in Mobile and Wireless Networks

Description: The resources (memory, power and bandwidth) are limited in wireless and mobile networks. Previous research has shown that the quality of service (QoS) of the mobile client can be improved through efficient resources management. This thesis contains two areas of research that are strongly interrelated. In the first area of research, we extended the MoSync Algorithm, a network application layer media synchronization algorithm, to allow play-out of multimedia packets by the base station upon the m… more
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Date: August 2003
Creator: Owens, Harold, II
Item Type: Refine your search to only Thesis or Dissertation

Routing Optimization in Wireless Ad Hoc and Wireless Sensor Networks

Description: Wireless ad hoc networks are expected to play an important role in civilian and military settings where wireless access to wired backbone is either ineffective or impossible. Wireless sensor networks are effective in remote data acquisition. Congestion control and power consumption in wireless ad hoc networks have received a lot of attention in recent research. Several algorithms have been proposed to reduce congestion and power consumption in wireless ad hoc and sensor networks. In this thesis… more
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Date: August 2003
Creator: Joseph, Linus
Item Type: Refine your search to only Thesis or Dissertation
open access

A Security Model for Mobile Agents using X.509 Proxy Certificates

Description: Mobile agent technology presents an attractive alternative to the client-server paradigm for several network and real-time applications. However, for most applications, the lack of a viable agent security model has limited the adoption of the agent paradigm. This thesis presents a security model for mobile agents based on a security infrastructure for Computational Grids, and specifically, on X.509 Proxy Certificates. Proxy Certificates serve as credentials for Grid applications, and their prim… more
Date: December 2002
Creator: Raghunathan, Subhashini
Item Type: Refine your search to only Thesis or Dissertation
open access

Symplectic Integration of Nonseparable Hamiltonian Systems

Description: Numerical methods are usually necessary in solving Hamiltonian systems since there is often no closed-form solution. By utilizing a general property of Hamiltonians, namely the symplectic property, all of the qualities of the system may be preserved for indefinitely long integration times because all of the integral (Poincare) invariants are conserved. This allows for more reliable results and frequently leads to significantly shorter execution times as compared to conventional methods. The res… more
Date: May 1996
Creator: Curry, David M. (David Mason)
Item Type: Refine your search to only Thesis or Dissertation
open access

A Top-Down Structured Programming Technique for Mini-Computers

Description: This paper reviews numerous theoretical results on control structures and demonstrates their practical examples. This study deals with the design of run-time support routines by using top-down structured programming technique. A number of examples are given as illustration of this method. In conclusion, structured programming has proved to be an important methodology for systematic program design and development.
Date: May 1978
Creator: Wu, Chin-yi Robert
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open access

Visualization of Surfaces and 3D Vector Fields

Description: Visualization of trivariate functions and vector fields with three components in scientific computation is still a hard problem in compute graphic area. People build their own visualization packages for their special purposes. And there exist some general-purpose packages (MatLab, Vis5D), but they all require extensive user experience on setting all the parameters in order to generate images. We present a simple package to produce simplified but productive images of 3-D vector fields. We used t… more
Date: August 2002
Creator: Li, Wentong
Item Type: Refine your search to only Thesis or Dissertation
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