This book constitutes the thoroughly refereed post-proceedings of the 11th Asian Computing Science Conference, ASIAN 2006, held in Tokyo, Japan, in December 2006.

The 17 revised full papers and 8 revised short papers presented together with 1 invited paper were carefully selected during two rounds of reviewing and revision from 115 submissions. The papers cover all aspects of theory, practice, applications, and experiences related to secure software and feature new ways to apply theoretical and practical techniques in secure software analysis, design, development, and operation.

This book constitutes the refereed proceedings of the 4th International Symposium on Ubiquitous Computing Systems, UCS 2007, held in Tokyo, Japan, in November 2007.

The 16 revised full papers and 8 revised short papers presented were carefully reviewed and selected from 96 submissions. The papers are organized in topical sections on security and privacy, context awareness, sensing systems and sensor network, middleware, modeling and social aspects, smart devices, and network.