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LDF-CLOCK: The Least-Dirty-First CLOCK Replacement Policy for PCM-based Swap Devices
Yoo, Seunghoon,Lee, Eunji,Bahn, Hyokyung The Institute of Electronics and Information Engin 2015 Journal of semiconductor technology and science Vol.15 No.1
Phase-change memory (PCM) is a promising technology that is anticipated to be used in the memory hierarchy of future computer systems. However, its access time is relatively slower than DRAM and it has limited endurance cycle. Due to this reason, PCM is being considered as a high-speed storage medium (like swap device) or long-latency memory. In this paper, we adopt PCM as a virtual memory swap device and present a new page replacement policy that considers the characteristics of PCM. Specifically, we aim to reduce the write traffic to PCM by considering the dirtiness of pages when making a replacement decision. The proposed replacement policy tracks the dirtiness of a page at the granularity of a sub-page and replaces the least dirty page among pages not recently used. Experimental results with various workloads show that the proposed policy reduces the amount of data written to PCM by 22.9% on average and up to 73.7% compared to CLOCK. It also extends the lifespan of PCM by 49.0% and reduces the energy consumption of PCM by 3.0% on average.
LDF-CLOCK : The Least-Dirty-First CLOCK Replacement Policy for PCM-based Swap Devices
Seunghoon Yoo,Eunji Lee,Hyokyung Bahn 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.1
Phase-change memory (PCM) is a promising technology that is anticipated to be used in the memory hierarchy of future computer systems. However, its access time is relatively slower than DRAM and it has limited endurance cycle. Due to this reason, PCM is being considered as a high-speed storage medium (like swap device) or long-latency memory. In this paper, we adopt PCM as a virtual memory swap device and present a new page replacement policy that considers the characteristics of PCM. Specifically, we aim to reduce the write traffic to PCM by considering the dirtiness of pages when making a replacement decision. The proposed replacement policy tracks the dirtiness of a page at the granularity of a sub-page and replaces the least dirty page among pages not recently used. Experimental results with various workloads show that the proposed policy reduces the amount of data written to PCM by 22.9% on average and up to 73.7% compared to CLOCK. It also extends the lifespan of PCM by 49.0% and reduces the energy consumption of PCM by 3.0% on average.
개착식 지하철 역사구조물의 지진 취약도 함수 개발 및 적정성 평가
양승훈(Seunghoon Yang),곽동엽(Dongyoup Kwak),김석중(Seokjung Kim),유병수(Byeungsoo Yoo),유민택(Mintaek Yoo) 한국철도학회 2024 한국철도학회논문집 Vol.27 No.3
본 논문에서는 선행 개발된 지하철 역사의 수치해석 모델을 활용하여 지진 취약도 함수를 개발하는 과정을 설명한다. 국내 지하 역사 구조물의 대표단면에 대해 국내에서 발생한 지진 가속도 시간이력 및 국내 설계 기준 입력 지진 하중을 적용한 동적 수치해석 결과를 활용하였다. 이전 연구의 수치 모델은 지반의 깊이 및 토양의 분류에 따라 총33개의 사례에 대해 개발되었으며, 표준설계스펙트럼에 매칭된 입력 지진파를 사용하였다. 개발된 모델에서 취약도 함수의 개발 절차를 손상 지수와 손상 정도에 따라 나누어 제시하였으며 이를 기반으로 하여 취약도 함수를 정립하였다. 그 후, 개발된 취약도 함수를 기존에 개발된 다른 선행 연구들의 지진 취약도 함수와 비교하였다. 이러한 비교를 통해 취약도 함수의 적정성에 대한 평가를 수행하였다. In this paper, the process of developing seismic fragility functions using a numerical model of previously developed underground structures is explained. The numerical model presented in previous studies was developed for a total of 33 cases, considering input motion using Koreas standard design spectra and applying the model based on the depth of the ground and soil classification. The development procedure of the fragility function in the developed model is presented and categorized by damage index and damage state; these results are used to establish the fragility function. Subsequently, the developed fragility function was compared with seismic fragility functions from previous studies. Through this comparison, an evaluation of the adequacy of the fragility function was conducted.
유승훈(Seunghoon Yoo),박명환(Myunghwan Park),황성인(Seongin Hwang),설현주(Hyeonju Seol) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.3
Manned-unmanned teaming can be a very promising air-to-air combat tactic since it can maximize the advantage of combining human insight with the robustness of the machine. The rapid advances in artificial intelligence and autonomous control technology will speed up the development of manned-unmanned teaming air-to-air combat system. In this paper, we introduce a manned-unmanned teaming air-to-air combat tactic which is composed of a manned aircraft and an UAV. In this tactic, a manned aircraft equipped with radar is functioning both as a sensor to detect the hostile aircraft and as a controller to direct the UAV to engage the hostile aircraft. The UAV equipped with missiles is functioning as an actor to engage the hostile aircraft. We also developed a combat scenario of executing this tactic where the manned-unmanned teaming is engaging a hostile aircraft. The hostile aircraft is equipped with both missiles and radar. To demonstrate the efficiency of the tactic, we run the simulation of the scenario of the tactic. Using the simulation, we found the optimal formation and maneuver for the manned-unmanned teaming where the manned-unmanned teaming can survive while the hostile aircraft is shot-downed. The result of this study can provide an insight to how manned aircraft can collaborate with UAV to carry out air-to-air combat missions.
대학생의 우주 교육을 위한 라즈베리 파이 기반 캔위성 수업자료 개발과 적용
유승훈(Seunghoon Yoo),이상현(Sanghyun Lee),이상구(Sangku Lee),이영건(Younggun Lee) 한국공학교육학회 2023 공학교육연구 Vol.26 No.1
The purpose of this study is to develop Raspberry Pi-based CanSat instruction materials for liberal arts classes to be used in university space education. The educational satellite simulation program is developed by applying the ADDIE program consisting of analysis, design, development, execution, and evaluation of 15 lessons per semester. The usefulness of the instruction materials is evaluated by a validity test of a total of 6 experts. The proposed materials are applied to 100 college students from various majors. To analyze the impact on creative problem-solving ability, a questionnaire is conducted before and after class, and as a result, it is confirmed that there is a significant improvement in all areas after class. The class satisfaction survey is conducted for a total of 10 questions, and the average score is 4.41 out of 5, which is high. In conclusion, the proposed instruction materials make it possible to achieve successful space education using Raspberry Pi and improve creative problem-solving ability in universities.
자동차 환경 내 음성인식 에이전트 사용자의 행동에 관한 질적 연구
이승훈(Seunghoon Lee),김나은(Naeun Kim),양민영(Min-young Yang),유영재(Youngjae Yoo),김진우(Jinwoo Kim) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
본 연구에서는 자동차 환경에서 음성인식 에이전트를 사용하는 운전자의 행태를 탐색적으로 살펴보고자 한다. 본 연구의 목적은 음성인식을 활발하게 사용하는 리드 유저를 대상으로 차량의 음성 AVN (Audio Video Navigation)과 모바일 기반의 음성 에이전트를 함께 사용하는 경험을 탐구하여 경험 요인을 제시하는 것이다. 연구 방법으로 실제 음성인식 사용자의 행태를 관찰하고자 맥락 질문법을 통해 자료를 수집하고, 경험적 자료에 근거하여 개방 코딩을 사용하고 음성인식 사용 경험을 범주화 하였다. 본 연구는 음성인식 인터랙션이 운전자 경험에 영향을 미치는 요인에 대한 연구인 동시에 발견된 변수들을 통해 추후 정량적인 연구의 기반이 될 수 있다는 점에서 이론적 함의를 가지며, 커져가는 음성인식 에이전트 시장이 자동차 산업으로 유입되며 소요되는 사용자 경험적 요인을 설계 및 개선하는 데 있어 자동차 환경에서의 음성인식 인터랙션 전략 방향에 반영될 수 있다는 점에서 실용적 함의를 가진다고 할 수 있다.