A transaction costs explanation of inter-local government collaboration.

A transaction costs explanation of inter-local government collaboration.

Date: August 2005
Creator: Krueger, Eric L.
Description: This study develops a model of collaboration choice among city governments. The theoretical model suggests that collaboration is a function of transaction costs that vary with different institutional arrangements utilized in cities, as well as the degree of competition between cities. This study argues that cities facing high transaction costs and high competition are less likely to participate in collaboration and to participate less deeply. Underlying these environmental factors are resource factors that create incentives for cities to collaborate for efficiency gains, which affect both the decision to collaboration and the depth of collaboration. Eleven hypotheses are presented to explain why cities choose to participate in collaboration in the first stage of the analysis and how deeply they collaborate in the second stage. Utilizing a Heckman model of this two-stage process, I find broad support for a number of variables that measure each of these theoretical constructs.
Contributing Partner: UNT Libraries
A Guide to Distributed Digital Preservation

A Guide to Distributed Digital Preservation

Date: 2010
Creator: MetaArchive Cooperative
Description: This text is a collection of essays that gives an overview of the reasons for considering distributed digital preservation (a system which maintains copies of digital objects in multiple geographic locations) as well as considerations for implementing this kind of digital preservation. According to the back cover, "Readers may use this guide to gain both a philosophical and practical understanding of the emerging field of distributed digital preservation, including how to establish or join a network."
Contributing Partner: UNT Libraries
Energy-Aware Time Synchronization in Wireless Sensor Networks

Energy-Aware Time Synchronization in Wireless Sensor Networks

Date: December 2006
Creator: Saravanos, Yanos
Description: I present a time synchronization algorithm for wireless sensor networks that aims to conserve sensor battery power. The proposed method creates a hierarchical tree by flooding the sensor network from a designated source point. It then uses a hybrid algorithm derived from the timing-sync protocol for sensor networks (TSPN) and the reference broadcast synchronization method (RBS) to periodically synchronize sensor clocks by minimizing energy consumption. In multi-hop ad-hoc networks, a depleted sensor will drop information from all other sensors that route data through it, decreasing the physical area being monitored by the network. The proposed method uses several techniques and thresholds to maintain network connectivity. A new root sensor is chosen when the current one's battery power decreases to a designated value. I implement this new synchronization technique using Matlab and show that it can provide significant power savings over both TPSN and RBS.
Contributing Partner: UNT Libraries
Cell Design to Maximize Capacity in CDMA Networks

Cell Design to Maximize Capacity in CDMA Networks

Date: April 2002
Creator: Akl, Robert G.
Description: This presentation discusses the code division multiple access (CDMA) inter-cell effects, capacity regions, maximizing network capacity, mobility, a call admission control algorithm, and network performance.
Contributing Partner: UNT College of Engineering
CCAP: A Strategic Tool for Managing Capacity of CDMA Networks

CCAP: A Strategic Tool for Managing Capacity of CDMA Networks

Date: 1998
Creator: Akl, Robert G.
Description: This presentation discusses CCAP, a strategic tool for managing capacity of CDMA networks. CCAP is a graphical interactive tool for CDMA that calculates the coverage area, call capacity of a CDMA network, and subscriber network performance to optimize capacity.
Contributing Partner: UNT College of Engineering
Capacity Allocations in Multi-cell UMTS Networks for Different Spreading Factors with Perfect and Imperfect Power Control

Capacity Allocations in Multi-cell UMTS Networks for Different Spreading Factors with Perfect and Imperfect Power Control

Date: January 2006
Creator: Akl, Robert G. & Nguyen, Son
Description: This presentation discusses user and interference models, wideband code division multiple access (WCDMA) capacity with perfect and imperfect power control, and spreading factors with numerical results.
Contributing Partner: UNT College of Engineering
Resource Discovery Using Z39.50: Promise and Reality

Resource Discovery Using Z39.50: Promise and Reality

Date: November 2000
Creator: Moen, William E.
Description: This paper discusses the Z39.50 protocol. The ANSI/NISO Z39.50 protocol for information retrieval addresses the complex challenges of intersystem communication. Original uses envisioned for the protocol look very little like current implementations and uses. In the 1980s, users on one library catalog system would search and retrieve bibliographic records on a remote system. By the late 1990s, there was a need for discovering networked resources and integrating access to them. Yet, the Z39.50 protocol has addressed both these scenarios. This paper provides a portrayal of Z39.50 that explains its flexibility in response to a variety of information retrieval requirements in the networked environment.
Contributing Partner: UNT College of Information
A Non-equilibrium Approach to Scale Free Networks

A Non-equilibrium Approach to Scale Free Networks

Date: August 2012
Creator: Hollingshad, Nicholas W.
Description: Many processes and systems in nature and society can be characterized as large numbers of discrete elements that are (usually non-uniformly) interrelated. These networks were long thought to be random, but in the late 1990s, Barabási and Albert found that an underlying structure did in fact exist in many natural and technological networks that are now referred to as scale free. Since then, researchers have gained a much deeper understanding of this particular form of complexity, largely by combining graph theory, statistical physics, and advances in computing technology. This dissertation focuses on out-of-equilibrium dynamic processes as they unfold on these complex networks. Diffusion in networks of non-interacting nodes is shown to be temporally complex, while equilibrium is represented by a stable state with Poissonian fluctuations. Scale free networks achieve equilibrium very quickly compared to regular networks, and the most efficient are those with the lowest inverse power law exponent. Temporally complex diffusion also occurs in networks with interacting nodes under a cooperative decision-making model. At a critical value of the cooperation parameter, the most efficient scale free network achieves consensus almost as quickly as the equivalent all-to-all network. This finding suggests that the ubiquity of scale free networks in nature ...
Contributing Partner: UNT Libraries
Electrical stimulation of nerve cell networks growing on microelectrode arrays: stimulation efficiency and entrainment

Electrical stimulation of nerve cell networks growing on microelectrode arrays: stimulation efficiency and entrainment

Date: March 31, 2005
Creator: Jain, Vivek & Gross, Guenter W.
Description: This presentation discusses research on electrical stimulation of nerve cell networks growing on microelectrode arrays. The objective of this study is to characterize stimulation efficiency/entrainment as a function of the following variables: frequency (pulses/trains), pulse durations, and number of pulses/trains.
Contributing Partner: UNT Honors College
Effects of Call Arrival Rate and Mobility on Network Throughput in Multi-Cell CDMA

Effects of Call Arrival Rate and Mobility on Network Throughput in Multi-Cell CDMA

Date: June 1999
Creator: Hegde, Manju V.; Akl, Robert G. & Min, Paul S.
Description: This presentation discusses call arrival rate and mobility. The effect of call arrival rate on the capacity of a code-division multiple-access (CDMA) cellular network is evaluated.
Contributing Partner: UNT College of Engineering
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