研究発表

We have a strong demand to design computer control safety system because crew stats to stay the international space station continuously, but there is no design framework for spacecraft computer control safety system. In this paper, we propose the architecture framework for spacecraft computer control safety system to guide a safety systems engineer to design computer controlled safety system. This framework is based on the general safety design process and NASA's computer safety requirements. The architecture framework can be proposed in accordance with the coming new IEEE1471 standard. This architecture framework can cover all design processes which are mandatory to be conducted to design system safety architecture. From this result, we suppose that this architecture framework reaches at least mandatory level.

According to the definition of "System" in various standards and handbooks, a systemdoes not necessarily have hardware-software components. This means that a social system without hardware-software elements is a kind of system. However, systems engineering techniques are not directly applied to define a solution of a non-technical social system's problems. In this paper, we propose a standard approach to find out multiple view points todescribe architecture, because the view points are one of the most important aspects of architectural design activities. And also we show one example that we applied our proposedapproach to non-technical social system: insurance system. It proved to be positive in applying architectural design technique with appropriate view points to design social system architecture.

This paper is to provide the ex post analysis on graduate schools of System Design and Management (SDM), the brand-new type graduate schools for systems engineering education. By trailing historical background of system thinking, design thinking and management theory, the paper made it clear with phylogenic approach that graduate schools of SDM are built on well-balanced and hybrid integration of those three methodologies. And it also identified that these graduate schools are designed to manage teaching systemically and systemically problem-solving the issues of complex and interconnected system in the society.

Federated satellite systems (FSS) are a new class of space-based systems which emphasize a distributed architecture. New information exchanging functions among FSS members enable data transportation, storage, and processing as on-orbit services. As a system-of-systems, however there are significant technical and social barriers to designing a FSS. To mitigate these challenges, this paper develops a multi-stakeholder interactive simulation for use in future design activities. An FSS simulation interface is defined using the High Level Architecture to include orbital and surface assets and associated transmitters, receivers, and signals for communication. Sample simulators (federates) using World Wind and Orekit open source libraries are applied in a prototype simulation (federation). The application case studies a conceptual FSS using the International Space Station (ISS) as a service platform to serve Earth-observing customers in sun-synchronous orbits (SSO). Results identify emergent effects between FSS members including favorable ISS power conditions and potential service bottlenecks to serving SSO customers.

It is difficult to assess the risk of software-intensive medical devices. An extended notation of FTA recognizes the risk class before and after the risk control measure and the software in the system affects the top event of FTA.