The papers in this book were prepared for and presented at the International ConferenceonInformationNetworking2004(ICOIN2004), whichwasheldfrom February 18 to 20, 2004 at Busan, Korea.It was organizedby the KISS (Korean Information Science Society) SIG-IN in Korea and the IPSJ (Information P- cessing Society of Japan) SIG-IN. The papers were selected through two steps: (1)referralbyTPCmembersand reviewers;and(2)on-sitepresentationreviews by session chairs and conference participants. The theme of ICOIN 2004 was "Convergencein Broadband and Mobile N- working", considering high-speed mobile networks. Even though it seems that a kind of "slow-speed" mobile Internet service is to be provided in the market sooner or later, it would not be an ultimate solution for the users, who require more "QoS-rich" services. In the near future, mobile services will adopt hi- speed networking technology. At the same time, mobile service users will anti- pate that a reasonable level of quality of service and security is provided. Based onthis, ICOIN2004requestedpapersontechnologiesformobility, qualityofs- vice, security, broadbandaccess, andapplications, focusingonenhancedInternet protocolsandalgorithms, their implementation, and the convergencetechnology required to support wired and wireless Internet. This book contains articles on the following subjects related to information networking from the low-layer transmission technologies to the higher-layer p- tocols and services. - Mobility Internet and Ubiquitous Computing: Concerned with mobile ad hoc networking, mechanisms for ubiquitous environments, routing in mobile networks, and mobile IP protocols. - QoS, Measurement and Performance Analysis: Concerned with QoS-related routingalgorithmsand protocols, QoS provisioningInternet protocols, m- elling and analysis, and performance measurement. - High-Speed Network Technologies: Concerned with multicast in high-speed networks, advanced algorithms and protocols, and switching and routing.