Title	Performance Improvement using Directional Antennas in Ad Hoc Networks
Author	Hetal Jasani, Kang Yen
Citation	Vol. 6  No. 6  pp. 180-188
Keywords	Directional Antennas, Mobile Ad Hoc Networks, Network Layer, On-Demand Routing Protocols, Dynamic Source Routing, and Physical Layer.

Title	The Design of the Network Service Access Control System through Address Control in IPv6 Environments
Author	Youngjoo Ahn, Seongjin Ahn, Jinwook Chung
Citation	Vol. 6  No. 6  pp. 174-179
Keywords	IPv6, Network security management, Network security, Access Control

Title	An Improved EM Algorithm for Network Link Delay Distributions Inference
Author	Hongjie Sun, Binxing Fang, Hongli Zhang
Citation	Vol. 6  No. 6  pp. 170-173
Keywords	network tomography, link delay distribution, Expectation-Maximization(EM) algorithm, A* algorithm

Title	User-oriented Operational Interface for Virtual Learning Environment
Author	Tomoko Kojiri, Yasuki Ito, Toyohide Watanabe
Citation	Vol. 6  No. 6  pp. 163-169
Keywords	Human interface, modeling student’s intention, logical window network, automatic movement of windows