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A Model of Multiprocessor System with Communication Delays and Its Scheduling Method
Takashi Otsuka,Hironori Youhata,Qi-Wei Ge,Mitsuru Nakata,Yuu Moriyama,Hirotoshi Tonou 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper aims at developing a scheduling method for multiprocessor systems with communication time. In this paper, we firstly propose a model of multiprocessor system with communication time occurring in reading data. Then, for the proposed model, we propose a scheduling method (called AMCN scheduling method) that (ⅰ) divides a task graph to subgraphs so that a task (called node hereafter) and its successors and predecessors are as much as possible included in the same subgraph to shorten communication time; and (ⅱ) uses a fixed processor to execute all the nodes of a subgraph. Finally, we do computational simulation experiments to evaluate our scheduling method.
Development of Web-based Design Review System for Reliability and Safety Knowledge Management
유이치 오츠카,타카시 유카와,요시하루 뮤토,Otsuka, Yuichi,Yukawa, Takashi,Mutoh, Yoshiharu The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.2
This paper describes a web-based design review system as a knowledge management system relating reliability and safety system design. Since people's consciousness for safety and security become sensitive and increases the need of establishing a proactive prevention method for internal failures and relating risks in products. It also means that prevailing tacit knowledge in retired workers, in order to transform them to be easily used to support new system development, become more important. When considering safety and reliability design, at least two data sheet are necessary; Failure Modes and Effects Analyses (FMEA) and Risk Assessment (RA). These two data are practically made separately. However, it includes the concerns that a risk by failures during long-term use may not be noticed. To overcome this insufficiency, a support tool for integrating reliability evaluation and risk assessment data simultaneously is expected to be revealed. The authors have then developed a web-based design review system for reliability and safety system design. The system include various profitable functions; making FMEA and RA sheet, retrieving past data sheet for engineering change management and new product development and web-based discussion to increase the efficiency of discussion. The system is applied to one practical development works in order to demonstrate its effectiveness that is to be made clear by interviewing user's qualitative comment.