日本移动服务业的过去和将来

分别对日本三代移动通信系统的发展进行了描述。第一代系统致力于实现随时、随地的通话，第二代系统的特征是基于语音的附加服务、低速的移动计算、移动因特网和位置服务，第三代系统将以基于视频的全球范围内高速多媒体服务和移动IT为特征。在未来的后3G系统中，这些服务都将以虚拟永远在线的方式无缝、高速地普遍提供。     

The design policy for a GSM-based IMT-2000 network

The third-generation mobile network has been a topic of considerable interest worldwide and has begun to be commercialized throughout the world. The 3G mobile network has evolved from two types of 2G networks; one type has evolved from GSM and another from ANSI-41. We operate the Personal Digital Cellular network as a 2G network and have designed a GSM-based IMT-2000 network as a 3G network. This article gives our design policy for the GSM-based IMT-2000 network and the technology that enabled us to develop the network based on this policy (e.g., ATM switching in the core network). Furthermore, the foundations for 2G/3G dual network operation (e.g., number portability and succession of 2G services in a 3G network) and efficient transition from a 2G network to a 3G network are also considered.     

热喷涂工业与应用趋势(英文)

本文综述了热喷涂工业的技术趋势和应用趋势。为提高涂层的性能,高速热喷涂技术的发展得到了较多的重视。混合喷涂技术及新型热喷涂材料如高纯和超细及纳米材料在制备功能涂层方面也得到了研究。为提高电厂及航空发动机燃机效率,新型TBC和高温可磨耗涂层正在得到研究。在环保问题方面,新的改进型涂层如HVOF喷涂细碳化物涂层正在得到研究,以替代镀铬技术。