This paper presents a new tourism local community system based on the LOD (Linked Open Data). In this study, the tourism-related data are converted into the RDF (Resource Description Framework) data and stored as LOD database in the local community system. N-triple data are generated by parsing the texts and connected to other related terms. Therefore, the relationship could be realized close to the ontology. The prototype system is constructed and the validity of the proposed system is confirmed by the experiments.

This paper presents a new game community support system and shows an experimental prototype system, based on an Internet social network system. The experimental results show the validity of this system and confirm the support function. Although competition among game creators or candidates is usually severe, they can communicate comfortably and collaborate with each other, using this system. As the system has a support function for giving advice, finding friends, and encouraging them, they can also assist and collaborate by mutually supplementing their weak points. In this system, discussion or communication among community members is driven by a desire to improve the game, and community members can create and make new games easily.

This paper presents the new mobile community support system, YourServer, which can provide weblog services, web photo album service, and remote control services, etc. As this system is simple and its programs can be saved in the USBflash memory, users can carry it and operate the community services at anywhere by connecting it to the PC. Then the cellular phones can also access to this system. The prototype system is constructed and he basic operation is conjirmed by using a 32MB Flash memory.

This paper presents a new voice objective measurement method of VoIP (voice over IP). Although the subjective evaluation by human MOS (mean opinion score) is the best evaluation, many testees must participate in the voice experiments and expensive measuring instruments and environments, such as a special acoustic room are needed. In order to measure the voice quality easily, the new objective measurement method is presented and studied using experiments.

A high-speed wireless network has been constructed that utilizes the newly approved 60 GHz frequency band. In Japan, this newly allocated millimeter wave can be used without a license. The system configuration and the experimental results are shown. The prototype system has been constructed at the Waseda University campus and the operation of this system is confirmed. Then the transmission characteristics in the experiments show very good and this system can provide the remote lecture service and seminar, etc.

Digital data services have been offered by NTT since 1978. The largest part of the entire digital data network cost is attributable to subscriber loop transmission that includes digital service units (DSU's) and office channel units (OCU's). Therefore, it is important to reduce DSU and OCU costs for economizing on digital data services. In order to achieve this purpose, new LSI DSU and OCU have been developed. The LSI is used for a digital signal processing unit, which occupies most of the equipment cost and size. The LSI can be applied to all bearer rates from 3.2 to 64 kbits/s, for NTT digital data services (leased circuit service, circuit switched service and packet switched service). It is highly significant that adoption of the LSI in DSU and OCU makes the following estimations feasible: 1) About 30 to 40 percent Cost reduction 2) About 25 percent size reduction 3) About 30 to 50 percent failure rate reduction 4) About 50 to 70 percent power consumption reduction. Summary The most expensive part of the network that carries NTT Digital Data Services is the subscriber loop transmission system, which includes DSU and OCU. This paper describes the design philosophy for introducing LSI technology in the DSU and OCU for cost reduction. Then the function, construction and evaluation are presented for the newly developed LSI DSU and OCU, based on the above design concept.