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in creator/contributor: "Mikler, Armin R."

open access

The Influence of Disease Mapping Methods on Spatial Patterns and Neighborhood Characteristics for Health Risk

This thesis addresses three interrelated challenges of disease mapping and contributes a new approach for improving visualization of disease burdens to enhance disease surveillance systems. First, it determines an appropriate threshold choice (smoothing parameter) for the adaptive kernel density estimation (KDE) in disease mapping. The results show that the appropriate threshold value depends on the characteristics of data, and bandwidth selector algorithms can be used to guide such decisions a… more

Date: December 2017

Creator: Ruckthongsook, Warangkana

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Extensions to Jinni Mobile Agent Architecture

We extend the Jinni mobile agent architecture with a multicast network transport layer, an agent-to-agent delegation mechanism and a reflection based Prolog-to-Java interface. To ensure that our agent infrastructure runs efficiently, independently of router-level multicast support, we describe a blackboard based algorithm for locating a randomly roaming agent. As part of the agent-to-agent delegation mechanism, we describe an alternative to code-fetching mechanism for stronger mobility of mobil… more

Date: May 2001

Creator: Tyagi, Satyam

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Role of Intelligent Mobile Agents in Network Management and Routing

In this research, the application of intelligent mobile agents to the management of distributed network environments is investigated. Intelligent mobile agents are programs which can move about network systems in a deterministic manner in carrying their execution state. These agents can be considered an application of distributed artificial intelligence where the (usually small) agent code is moved to the data and executed locally. The mobile agent paradigm offers potential advantages over many… more

Date: December 2000

Creator: Balamuru, Vinay Gopal

Item Type: Thesis or Dissertation

Partner: UNT Libraries

Temporally Correct Algorithms for Transaction Concurrency Control in Distributed Databases

Many activities are comprised of temporally dependent events that must be executed in a specific chronological order. Supportive software applications must preserve these temporal dependencies. Whenever the processing of this type of an application includes transactions submitted to a database that is shared with other such applications, the transaction concurrency control mechanisms within the database must also preserve the temporal dependencies. A basis for preserving temporal dependencies i… more

Access: Restricted to UNT Community Members. Login required if off-campus.

Date: May 2001

Creator: Tuck, Terry W.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

Global Stochastic Field Simulator

This poster was featured at the 2013 Perot Museum of Nature and Science's 'Social Science' exhibit. It discusses the Global Stochastic Field Simulator, conceived in the summer of 2011.

Date: June 21, 2013

Creator: Mikler, Armin R.; O'Neill, Marty; Helsing, Joseph; Camp, Taylor & Indrakanti, Saratchandra

Item Type: Poster

Partner: UNT College of Engineering

A Framework to Simulate and Visualize Epidemics

This poster was featured at the 2013 Perot Museum of Nature and Science's 'Social Science' exhibit. The poster discusses a framework to simulate and visualize epidemics.

Date: June 21, 2013

Creator: Mikler, Armin R.; O'Neill, Marty; Helsing, Joseph; Camp, Taylor & Indrakanti, Saratchandra

Item Type: Poster

Partner: UNT College of Engineering

open access

Optimizing Non-pharmaceutical Interventions Using Multi-coaffiliation Networks

Computational modeling is of fundamental significance in mapping possible disease spread, and designing strategies for its mitigation. Conventional contact networks implement the simulation of interactions as random occurrences, presenting public health bodies with a difficult trade off between a realistic model granularity and robust design of intervention strategies. Recently, researchers have been investigating the use of agent-based models (ABMs) to embrace the complexity of real world inte… more

Date: May 2013

Creator: Loza, Olivia G.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

Implementation of Scalable Secure Multicasting

A large number of applications like multi-player games, video conferencing, chat groups and network management are presently based on multicast communication. As the group communication model is being deployed for mainstream use, it is critical to provide security mechanisms that facilitate confidentiality, authenticity and integrity in group communications. Providing security in multicast communication requires addressing the problem of scalability in group key distribution. Scalability is a c… more

Access: Restricted to UNT Community Members. Login required if off-campus.

Date: August 2002

Creator: Vellanki, Ramakrishnaprasad

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Dynamic Resource Management in RSVP- Controlled Unicast Networks

Resources are said to be fragmented in the network when they are available in non-contiguous blocks, and calls are dropped as they may not end sufficient resources. Hence, available resources may remain unutilized. In this thesis, the effect of resource fragmentation (RF) on RSVP-controlled networks was studied and new algorithms were proposed to reduce the effect of RF. In order to minimize the effect of RF, resources in the network are dynamically redistributed on different paths to make the… more

Date: December 2001

Creator: Iyengar Prasanna, Venkatesan

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

CMOS Active Pixel Sensors for Digital Cameras: Current State-of-the-Art

Image sensors play a vital role in many image sensing and capture applications. Among the various types of image sensors, complementary metal oxide semiconductor (CMOS) based active pixel sensors (APS), which are characterized by reduced pixel size, give fast readouts and reduced noise. APS are used in many applications such as mobile cameras, digital cameras, Webcams, and many consumer, commercial and scientific applications. With these developments and applications, CMOS APS designs are chall… more

Date: May 2007

Creator: Palakodety, Atmaram

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A nano-CMOS based universal voltage level converter for multi-VDD SoCs.

Power dissipation of integrated circuits is the most demanding issue for very large scale integration (VLSI) design engineers, especially for portable and mobile applications. Use of multiple supply voltages systems, which employs level converter between two voltage islands is one of the most effective ways to reduce power consumption. In this thesis work, a unique level converter known as universal level converter (ULC), capable of four distinct level converting operations, is proposed. The sc… more

Date: May 2007

Creator: Vadlmudi, Tripurasuparna

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Analyzing Microwave Spectra Collected by the Solar Radio Burst Locator

Modern communication systems rely heavily upon microwave, radio, and other electromagnetic frequency bands as a means of providing wireless communication links. Although convenient, wireless communication is susceptible to electromagnetic interference. Solar activity causes both direct interference through electromagnetic radiation as well as indirect interference caused by charged particles interacting with Earth's magnetic field. The Solar Radio Burst Locator (SRBL) is a United States Air For… more

Date: May 2007

Creator: Kincaid, Cheryl-Annette

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Influence of Social Network Graph Structure on Disease Dynamics in a Simulated Environment

The fight against epidemics/pandemics is one of man versus nature. Technological advances have not only improved existing methods for monitoring and controlling disease outbreaks, but have also provided new means for investigation, such as through modeling and simulation. This dissertation explores the relationship between social structure and disease dynamics. Social structures are modeled as graphs, and outbreaks are simulated based on a well-recognized standard, the susceptible-infectious… more

Date: December 2010

Creator: Johnson, Tina V.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

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

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: Thesis or Dissertation

Partner: UNT Libraries

open access

A Framework for Analyzing and Optimizing Regional Bio-Emergency Response Plans

The presence of naturally occurring and man-made public health threats necessitate the design and implementation of mitigation strategies, such that adequate response is provided in a timely manner. Since multiple variables, such as geographic properties, resource constraints, and government mandated time-frames must be accounted for, computational methods provide the necessary tools to develop contingency response plans while respecting underlying data and assumptions. A typical response sc… more

Date: December 2010

Creator: Schneider, Tamara

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

An Annotated Bibliography of Mobile Agents in Networks

The purpose of this thesis is to present a comprehensive colligation of applications of mobile agents in networks, and provide a baseline association of these systems. This work has been motivated by the fact that mobile agent systems have been deemed proficuous alternatives in system applications. Several mobile agent systems have been developed to provide scalable and cogent solutions in network-centric applications. This thesis examines some existing mobile agent systems in core networking a… more

Date: December 2002

Creator: Sriraman, Sandhya

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

DirectShow Approach to Low-Cost Multimedia Security Surveillance System

In response to the recent intensive needs for civilian security surveillance, both full and compact versions of a Multimedia Security Surveillance (MSS) system have been built up. The new Microsoft DirectShow technology was applied in implementing the multimedia stream-processing module. Through Microsoft Windows Driver Model interface, the chosen IEEE1394 enabled Fire-i cameras as external sensors are integrated with PC based continuous storage unit. The MSS application also allows multimedia … more

Date: December 2002

Creator: Xiao, Wu

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Landscape forest modeling of the Luquillo Experimental Forest, Puerto Rico.

This thesis contributes to modeling the dynamics of forest community response to environmental gradients and disturbances over a mountain landscape. A gap model (FACET) was parameterized for species of various forest types (Tabonuco, Colorado, Dwarf and Palm), for many terrain conditions and was modified and extended to include species response to excess soil moisture and hurricanes. Landscape cover types were defined by dominance of species of each forest type and canopy height. Parameters of … more

Date: December 2002

Creator: Abbott-Wood, Chris

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

DADS - A Distributed Agent Delivery System

Mobile agents require an appropriate platform that can facilitate their migration and execution. In particular, the design and implementation of such a system must balance several factors that will ensure that its constituent agents are executed without problems. Besides the basic requirements of migration and execution, an agent system must also provide mechanisms to ensure the security and survivability of an agent when it migrates between hosts. In addition, the system should be simple enoug… more

Date: December 2002

Creator: Cozzolino, Clifford Joseph

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Design and Implementation of a Prolog Parser Using Javacc

Operatorless Prolog text is LL(1) in nature and any standard LL parser generator tool can be used to parse it. However, the Prolog text that conforms to the ISO Prolog standard allows the definition of dynamic operators. Since Prolog operators can be defined at run-time, operator symbols are not present in the grammar rules of the language. Unless the parser generator allows for some flexibility in the specification of the grammar rules, it is very difficult to generate a parser for such text. … more

Date: August 2002

Creator: Gupta, Pankaj

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Algorithms for Efficient Utilization of Wireless Bandwidth and to Provide Quality-of-Service in Wireless Networks

This thesis presents algorithms to utilize the wireless bandwidth efficiently and at the same time meet the quality of service (QoS) requirements of the users. In the proposed algorithms we present an adaptive frame structure based upon the airlink frame loss probability and control the admission of call requests into the system based upon the load on the system and the QoS requirements of the incoming call requests. The performance of the proposed algorithms is studied by developing analytical… more

Date: August 2000

Creator: Kakani, Naveen Kumar

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

The Design and Implementation of an Intelligent Agent-Based File System

As bandwidth constraints on LAN/WAN environments decrease, the demand for distributed services will continue to increase. In particular, the proliferation of user-level applications requiring high-capacity distributed file storage systems will demand that such services be universally available. At the same time, the advent of high-speed networks have made the deployment of application and communication solutions based upon an Intelligent Mobile Agent (IMA) framework practical. Agents have prove… more

Date: May 2000

Creator: Hopper, S. Andrew

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Direct Online/Offline Digital Signature Schemes.

Online/offline signature schemes are useful in many situations, and two such scenarios are considered in this dissertation: bursty server authentication and embedded device authentication. In this dissertation, new techniques for online/offline signing are introduced, those are applied in a variety of ways for creating online/offline signature schemes, and five different online/offline signature schemes that are proved secure under a variety of models and assumptions are proposed. Two of the pr… more

Date: December 2008

Creator: Yu, Ping

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Variability-aware low-power techniques for nanoscale mixed-signal circuits.

New circuit design techniques that accommodate lower supply voltages necessary for portable systems need to be integrated into the semiconductor intellectual property (IP) core. Systems that once worked at 3.3 V or 2.5 V now need to work at 1.8 V or lower, without causing any performance degradation. Also, the fluctuation of device characteristics caused by process variation in nanometer technologies is seen as design yield loss. The numerous parasitic effects induced by layouts, especially for… more

Date: May 2009

Creator: Ghai, Dhruva V.

Item Type: Thesis or Dissertation

Partner: UNT Libraries