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A Multiprocessor Scheduling Methodology Considering Interprocessor Communication Time Delay
Hong, Chun Pyo,Choi, Seung Kook,Hong, Gye Pyo 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.5 No.5
A new parallel processing system, so called Clock-Skewed Parallel Processing system, is proposed. This system uses one or more shared bus as the basic interconnection network between processors, and a fixed amount of clock-skew is maintained between instruction execution of processors. The newly proposed system not only can handle the interprocessor communications very efficiently but also can explicitly incorporate the interprocessor communication delay into the parallel scheduling model. Along with the new parallel processing system, this paper also presents an efficient scheduling strategy for implementing shift-invariant flow graphs on the newly proposed system.
홍춘표,최승국,홍계표 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.4
In Pneumatic Fieldbus System, we need a data transmission system with high speed and high realibility for information interchange between main computer and solenoid valves and I/O devices. This paper presents a set of design techniques for a data communication system that is mainly used for pneumatic fieldbus system. For this purpose, we first designed hardware modules for an interface between central control module and local node that handles the operation of solenoid valves. In addition we developed a communication protocol for construction of RS-485 based multidrop network, and this protocol is basically designed with a kind of polling technique. Finally we evaluated performance of the developed system. The field test results show that, even under high noise environment, the data transmission of 375Kbps rate is possible up to 1,000m without using repeater. In addition, the system developed in this research is proved to be used easily for extension of a communication network because of its module structure.