Title	Maintaining Semantic Consistency in Real-Time Collaborative Graphics Editing Systems
Author	Jiajun Bu, Bo Jiang, Chun Chen
Citation	Vol. 6  No. 4  pp. 57-61
Keywords	CSCW, real-time collaborative graphics design, semantic preservation, semantic expression.

Title	Multicast Routing and Wavelength Assignation in Optical Networks with Ant Colony Optimization
Author	Diego Pinto, Benjam?n Bar?n, Marcos Villagra
Citation	Vol. 6  No. 4  pp. 62-70
Keywords	Routing, Wavelength Assignment, Multiobjective Optimization, Ant Colony Optimization.

Title	Multi-Processor Tasks with Resource and Timing Constraints Using Particle Swarm Optimization
Author	Tzu-Chiang Chiang, Po-Yin Chang, Yueh-Min Huang
Citation	Vol. 6  No. 4  pp. 71-77
Keywords	Job-shop scheduling, Particle swarm optimization, Energy function

Title	A Novel Greedy Computing Algorithm for Rectangle Packing Problems
Author	Yanbing Liu, Duanbing Chen
Citation	Vol. 6  No. 4  pp. 78-81
Keywords	Rectangle packing; packing; computing algorithm; matching degree.