An inventor who is skilled at constructing innovative designs is distinguished, not just by the first principles he knows, but by the way he uses these principles and how he focusses the search for novel devices among an overwhelming space of possibilities. We propose that an appropriate focus for design is the network of qualitative interactions between quantities, (called an interaction topol...

Cooperative communication has received tremendous interest for wireless networks. Most existing works on cooperative communications are focused on link-level physical layer issues. Consequently, the impacts of cooperative communications on network-level upper layer issues, such as topology control, routing and network capacity, are largely ignored. In this article, we propose a Capacity-Optimiz...

This paper studies channel assignment in multi-hop wireless networks in which nodes are equipped with multiple radios, each of which can be assigned to a channel. We argue for an approach that first assigns channels independently of traffic, to achieve basic connectivity and support light loads such as control traffic, and then dynamically assigns channels to the remaining radios in response to...

In ad-hoc networks the need for a distributed topology control algorithm is being widely recognized. In this paper we propose TC-ADHOC MAC, a medium access algorithm with topology control capabilities. The proposed algorithm aims at maintaining the minimum number of bidirectional neighbors of any wireless terminal very close to a certain connectivity threshold. The correctness of the algorithm ...

Topology control by means of transmit power adjustment is a well-studied technique for improving the network capacity and energy efficiency of wireless ad hoc networks. In this paper, we investigate the feasibility of connectivity and topology control in a real IEEE 802.11b testbed composed of inexpensive commercial off-the-shelf (COTS) routers. Although topology control via transmit power adju...

JAMES K. WILLSON†,§, XIAOFENG GAO†,¶, ZHONGHUA QU†,‖, YI ZHU†,∗∗, YINGSHU LI‡,†† and WEILI WU†,‡‡ †Department of Computer Science, University of Texas at Dallas 2601 North Floyd Road, Richardson, TX 75083, USA ‡Department of Computer Science, Georgia State University, USA §[email protected] ¶[email protected] ‖[email protected] ∗∗[email protected] ††[email protected] ‡‡weiliw...

In this paper we study proximity structures like Delaunay triangulations based on geometric graphs, i.e. graphs which are subgraphs of the complete geometric graph. Given an arbitrary geometric graph G, we define several Voronoi diagrams, Delaunay triangulations, relative neighborhood graphs, Gabriel graphs and then study their complexities when G is a general geometric graph or G is some speci...

Energy-efficient Self-monitoring of Wireless Sensor Network (Azad Ali) ................... 2 Is Reliability a Concern for Mobile WSNs (Faisal Karim) ............................................ 2 Attributes and Metrics defining Quality of Information in Wireless Sensor Networks (Vinay Sachidananda).....................................................................................................

In this paper, a new configuration for symmetrical and asymmetrical multilevel inverters is proposed. In asymmetric mode, different algorithms are suggested in order to determine the magnitudes of DC voltage sources. The merit of this topology to the conventional symmetric and asymmetric inverters is verified by the provided comparisons. This topology uses a lower number of power electronic dev...

Multiresolution modeling is a very important technique for interactive visualization of very large data sets. Multiresolution volume data structures allow the extraction of adaptively triangulated isosurfaces in large volume data sets at interactive frame rates, providing the user the ability to visualize the volume data in real-time. The isosurface is displayed at a coarse resolution for areas...