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실시간 멀티코어 임베디드 시스템에서 메모리 간섭 축소를 위한 실행 지연 가능 태스크 실행 모델
장혁수(Hyeoksoo Jang),박시형(Sihyeong Park),김형신(Hyungshin Kim) 한국정보기술학회 2024 한국정보기술학회논문지 Vol.22 No.2
As the requirements for real-time embedded systems continue to grow, multi-cores are being adopted However, due to interference between cores due to shared memory, the execution time of the task may increase. To solve this problem, task execution model such as Acquisition Execution Restitution(AER) has been proposed. However the proposed model may reduce the throughput or increase the overall execution time. In this paper, based on AER, we propose a task execution model that utilizes cache to delay the execution of tasks that can be executed simultaneously. Experiments showed that the proposed execution model reduces interference due to memory sharing between cores and reduced execution time by up to 35%.
나노 임프린트 장비 최적 환경을 위한 제어 장비 및 시스템에 관한 연구
박경서(Gyeong-seo Park),김우송(Woo-song Kim),임홍재(Hongjae Yim),장시열(Siyeol Jang),이기성(Keesung Lee),정재일(Jay Jeong),임시형(Sihyeong Lim),신동훈(Donghoon Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Controlling of thermal environment and flow in nanoimprint process chamber is important to ensure high precision levels of products. The purpose of this paper is to build optimal nanoimprint process environment. Because of this, Optimum PI control parameter for precise temperature control has been examined. Also porous medium of ventilation system is simulated for uniform flow in the equipment chamber. The porous medium consists of mesh structure, and is installed to place which flow the influx of the air flows. PID control parameter is based on the data obtained by experiment. And then heating and cooling method which simultaneously operated was used for decreasing an error. In conclude temperature in the equipment chamber was able to control precisely in the range of ±0.1℃ by the PID control parameter and Deadband.
레진의 경화 반응을 고려한 UV-NIL 공정의 열특성에 관한 실험 및 수치해석 연구
김우송(Woo-song Kim),박경서(Gyeong-seo Park),남진현(Jinhyun Nam),임홍재(Hongjae Yim),장시열(Siyeol Jang),이기성(Keesung Lee),정재일(Jay Jeong),임시형(Sihyeong Lim),신동훈(Donghoon Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The process conditions during ultraviolet nanoimprint lithography (UV-NIL) process such as temperature, stamping pressure, UV irradiation, etc. are effective factors for successful imprinting of complex and fine patterns. In this study, the effects of aluminum mold on the thermal characteristics of UV-NIL process were investigated through imprinting experiments and numerical simulations. The temperature of polymer resin on mold was measured to study thermal characteristics during UV curing. From the experimental and numerical results, the importance of curing reaction control for UV-NIL process was discussed for deformation characteristics.