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RM 스케줄링된 실시간 태스크에서의 최적 체크 포인터 구간 선정
郭成祐(Seong-Woo Kwak),鄭容朱(Young-Joo Jung) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
For a system with multiple real-time tasks of different deadlines, it is very difficult to find the optimal checkpoint interval because of the complexity in considering the scheduling of tasks. In this paper, we determine the optimal checkpoint interval for multiple real-time tasks that are scheduled by RM(Rate Monotonic) algorithm. Faults are assumed to occur with Poisson distribution. Checkpoints are inserted in the execution of task with equal distance in the same task, but different distances in other tasks. When faults occur, rollback to the latest checkpoint and re-execute task after the checkpoint. We derive the equation of maximum slack time for each task, and determine the number of re-executable checkpoint intervals for fault recovery. The equation to check the schedulibility of tasks is also derived. Based on these equations, we find the probability of all tasks executed within their deadlines successfully. Checkpoint intervals which make the probability maximum is the optimal.
성능 함수를 고려한 실시간 제어 태스크에서의 최적 체크 포인터 구간 선정
郭成祐(Seong-Woo Kwak),鄭容朱(Young-Joo Jung) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
In this paper, a novel method to determine the optimal checkpoint interval for real-time control task is proposed considering its performance degradation according to tasks's execution time. The control task in this paper has a specific sampling period shorter than its deadline. Control performance is degraded as the control task execution time is prolonged across the sampling period and eventually zero when reached to the deadline. A new performance index is defined to represent the performance variation due to the extension of task execution time accompanying rollback fault recovery. The procedure to find the optimal checkpoint interval is addressed and several simulation examples are presented.
김태영(Kim Tae-Young),박인성(Park In-Sung),원유미(Won Yoo-Mi),정용주(Jung Yong-Ju),박진훈(Park Jin-Hoon),유임주(Rhyu Im-Joo) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.4
This study was conducted to determine some physical fitness parameters of elite short track players, including the current world champion, and also to determine some of the physiological characteristics. Thirty subjects(short track player and control) performed physical fitness test, balance test and physical work capacity. The short track players showed: higher physical fitness(sit-up, left grip strength, trunk flextion, side-step, vertical jump, reaction time), higher physiological capacity(VO2max, anaerobic threshold, HRmax, optimal HR, HRmax during PWC, endurance time), smaller SBPmax and DBPmax compared with the group of control. Within the scope this study, the findings have suggested the following conclusions for the management of physiological characterstics and physical fitness promotion as well as short track strategy for the short track players.
WLAN System을 위한 U-slot 및 Short-pin 결합한 바람개비 모양의 이중대역(5.2/5.8GHz) 마이크로스트립 패치 안테나 설계 및 제작
김순섭(Soon-Seob Kim),최영준(Young-June Choi),주영달(Young-Dal Joo),정용주(Yoong-Joo Jung) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.5B
본 논문에서는 IEEE 802.11 기반의 WLAN(5.2/5.8GHz)대역에서 동작하는 바람개비 모양의 마이크로스트립 패치 안테나를 설계 및 제작하였다. 안테나의 크기는 17.4×17.4㎟ 이며 FR-4 기판을 사용하였다. 이동성을 위해 소형화하였고, 바람개비 패치 모양에 U-slot 및 Short-pin을 삽입하여 이중대역 공진특성 및 적절한 대역폭을 만족하도록 하였다. 또한 단일 양면기판을 사용하였고, 시뮬레이션설계는 바람개비 모양과 U-slot 및 Short-pin의 위치 변화, 패치길이를 최적화하여 제작 및 측정하였다. 제작한 안테나의 대역폭(Return loss<-10dB)은 5.2~5.8GHz대역에서 695MHz의 대역폭을 얻었다. H면과 E면 방사패턴의 3-dB 빔폭이 각각 81.13°, 85.43°로 넓은 빔폭을 얻었다. 또한 3.17~4.85dBi의 이득을 얻었다. In this paper, IEEE 802.11 based WLAN(5.2/5.8GHz) wideband Weathercock-shaped microstrip patch antenna was designed and manufactured. The antenna has a size of 17.4×17.4㎟ and utilized FR-4 board. The size was minimized for mobility, and Weathercock-shaped U-slot and short-pin was inserted to satisfy adequate bandwidth and double bandwidth resonance characteristics. In addition, the antenna incorporated single both-sided patch, and simulation design optimized the Weathercock-shaped, position of the U-slot and the short-pin, and the length of the patch for the measurement. The manufactured antenna achieved a bandwidth of 695MHz from 5.2~5.8GHz zone(Return loss<-10dB). Achieved a beam width of 81.13° and 85.43° for 3-dB beam width of H plane and Ep;ane radiation pattern, there was 3.17~4.85dBi gain.