オントロジーを基にしたWeb アプリケーション開発手法を提案する。ビジネスプロセス、ドメイン構造、法規の3つの側面を捉えたビジネスオントロジーを構築し、ソフトウェアシステムのユーザーと開発者との開発における共通理解を促す。対象ドメインのモデルをオントロジーにより表現し、設計仕様としての記述力不足をWeb アプリケーションの3 層構造に基づいたモデル、Web プロセス定義を用いて補う。提案手法を事例に適用した実験により、本手法はユーザーと開発者の共通理解に有用であることを確かめた。

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Recently, the various multimedia communication systems appeared, but interoperating of these systems is impossible. We propose an effective session layer protocol for multimedia communication systems. The protocol makes one and only TCP network connection between couples of hosts to manages various multimedia communications collectively.

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Recently ISDN (Integrated Services Digital Network) is getting popular to be used in data communications. It will open the wide area of application in various aspects in the near future. In this paper, in order to develop a variety of applications for ISDN communications, an effective construction method is proposed. First, a layered structure for communication systems is described together with the layer operation on the communication objects and the disciplines for layering system. Then, the ISDN communication toolkit is developed according to the layered structure. Finally, applying the proposed construction method, a novel image transmission system is realized, which was used in the experiment of image transmission during the international flower and green expo '90 in Osaka. By using the image transmission system, a distance database of Hi-Vision image was re-constructed, which was used in the teleprinting experiment in August 1990. The results of two experiments were quite acceptable. And, the proposed method is effective for constructing ISDN communication systems, which needs fewer changes for re-construction.

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This paper presents a spatial data transfer system to adapt to large-scale distributed networks and to improve data transfer performance with caching technique and concurrent reading process. We design this system using UML based on object-oriented analysis. We show some advantages in our proposed system against the ordinary GIS, in special, suitability to distributed networks.

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Power systems comprising an enormous number of components are monitored and controlled by SCADA systems, For efficient monitoring and control of organically linked power systems, it is necessary to connect the related SCADA systems through a communications network and to exchange needed information.
The RCN (Realtime Computer Network) protocol serves as a foundation in building a communications network for SCADA systems. The RCN protocol complies with OSI (Open Systems Interconnection), the international standard for communications protocols, and with the API/F (Application Interface) communications protocols, which covers provisions exclusively required for communication among SCADA systems. The RCN protocol supports both an inter-process information communication function and a file transfer function, and it can be extensively applied to control systems other than SCAR systems.
This paper presents a detailed explanation of the RCN protocol and the performance of the RCN protocol.

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Web アプリケーションの世界では、入門レベルとフレームワーク・コンテナを駆使するレベルに大きなギャップがあり、この間を埋める教材やツールが欠けているように思われる。本論文では、大規模業務用とは異なる要件をもつ教育用あるいは小規模業務用のコンテナ及びフレームワークとして開発したSabaphy を紹介する。これは、言語にPHP5 を使用し、EJB3 を簡略化したオブジェクト永続化とセッション管理の機能等を提供するもので、特別なインストールは不要、簡単なことは簡単に実行できる、段階的に学習できるといった特徴をもっている。

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The ATN (Aeronautical Telecommunication Network) is designed to present a global internetworking infrastructure for future aeronautical telecommunication. This report presents research activities on ATN conducted by ENRI (Electronic Navigation Research Institute) from fiscal 1996 to 2000. In these 5 years, we developed an experimental simulation system called EAST (Enri ATN Simulation Test bed). Using EAST, we verified the protocols and air/ground applications of ATN through the international experiments with Eurocontrol and Air Service Australia. The result of the experiments showed that ICS (Internet Communication Service) and ULCS (Upper Layer Communication Service) protocols of EAST are compatible with those of foreign experiment systems, and it also showed that air/ground applications of EAST have connectivity and compatibility with those of them. To evaluate the performance of the air/ground applications, we also conducted an experiment with EAST and pseudo AMSS (Aeronautical Mobile Satellite Service) subnetwork. The outlines and results of those experiments are also described in this report.

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Recently a number of 1kg class nano-satellites "CubeSat" are being developed and launced by universities all over the world. Based on this, the system and missions of these satellites is growing and the satellite data such as pictures and earth observation. So we must handle these large data and the means to transmitit these data is needed. On the other side, Cubesat which uses amateur radio is jammed by other operator. This paper explains the development of ground station for "Ground Station Network", whick aims at overcoming these problems. And we suggest that how to develop the satellite, which uses "Ground Staiton Network".

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In this paper, we propose a supporting method for developments of Web applications in order to support communication between users and developers. Our method combines three-layer architecture modeling of Web application and knowledge sharing technologies based on ontologies. The ontologies, which are used in the method and called enterprise application ontology (EAO), enable users and developers to form common understanding about system specification. EAO covers three aspects (legal aspect, business process, and software design) of business which is a candidate of development of a Web application. EAO includes three ontologies constructed from each of the three aspects. Concepts and structure of EAO are applied on page transition models, which are called Web Process Architecture, of a Web application. As a case study, we applied our method for a development of a ledger accounting system in a local government. And we confirmed that our method could support the development on the business analysis phase.

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