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Futurebus+를 공유버스로 하는 다중프로세서 시스템의 버스 시뮬레이터 설계
윤현진(Yun Hyun-Jin),임경은(Lim Kyung-Eun),박길철(Park Gil-Chul),황대준(Hwang Dae-Joon) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2B
In this paper, we design the simulation environment for evaluating the performance of multiprocessor systems using Futurebus+ as shared bus with various configurations. To evaluate our design of bus simulator, parallel work loads, multiple threads, are generated from single-thread codes trace on the benchmarks: rsa, sieve and 15×15 matrix. Some of the results from the simulation on the benchmarks is presented by graphic user interface. Typical results include the analysis on cache hit ratio, processor utilization and bus congestion ratio according to changes of the number of processor and cache coherency protocol. From the analysis we prove the processor utilization and the bus congestion ratio are greatly depend on cache hit ratio and write-broadcast protocol is more effective than write-invalidate protocols. The simulation environment with the basis of Futurebus+ would be used to evaluate the system performance of shared memory multiple processors.
멀티미디어 다자 참여 소프트웨어를 위한 윈도우 공유 기법의 설계 및 구현
박길철 한남대학교 교육연구소 1999 교육연구 Vol.7 No.1
An application sharing agent with the centralized architecture was designed and implemented. The application sharing makes collaborative work possible because participants share identical screens. The centralized architecture has only one application program among the entire sharing agents and the centralized sever takes care of input, process, and output. That is, a view generation and processing are located in the same place. Windows hooking can intercept a keyboard, a mouse, systems, bitmap and other events. The application sharing agent delivers intercepted events to its own application program and sends results to remote virtual application programs. The remote virtual application programs deliver their own events to the central application sharing agent and then act as if they have their application programs by receiving the results. Application sharing is convenient to use existing presentation materials or a courseware produced by educational experts without any modification in distance education. Especially, the application sharing will operate even if existing CAI (Computer Assisted Instruction) programs has not been developed for the network purpose and students do not possess the courseware.