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주기 및 비주기 태스크의 효율적인 관리를 위한 실시간 센서 노드 플랫폼의 설계
김병훈,정경훈,탁성우,Kim, Byoung-Hoon,Jung, Kyung-Hoon,Tak, Sung-Woo 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.4
본 논문에서는 주기 및 비주기 태스크의 효율적인 관리를 제공하는 실시간 센서 노드 플랫폼을 설계하고 구현하였다. 기존 센서 노드의 소프트웨어 플랫폼은 제한된 센서 노드의 자원을 효율적으로 사용하기 위하여 메모리 및 전력 소비량의 최소화에만 초점을 두었기 때문에 태스크의 실시간성과 빠른 평균 응답시간을 보장하는 실시간 센서 노드의 소프트웨어 플랫폼에는 적합하지 않다. 이에 본 논문에서는 센서 노드의 소프트웨어 플랫폼으로 많이 사용되고 있는 TinyOS 기반에서 태스크의 실시간성과 빠른 평균 응답시간을 보장할 수 있는 기법과 한계를 분석하였으며, 모든 주기 태스크가 마감시한 내에 실행이 완료되는 것을 보장하고 비주기 태스크의 응답시간을 최소화하는 실시간 센서 노드 플랫폼을 제안하였다. 본 논문에서 제안한 플랫폼은 Atmel사의 초경량 8비트 마이크로프로세서인 Atmega128L이 탑재된 센서 보드에서 구현되었다. 구현된 실시간 센서 플랫폼의 성능을 분석한 결과, 모든 주기 태스크의 마감시한 보장을 제공함과 동시에 향상된 비주기 태스크의 평균 응답시간과 낮은 시스템의 평균 처리기 이용률을 확인할 수 있었다. In this paper, we propose a real-time sensor node platform that efficiently manages periodic and aperiodic tasks. Since existing sensor node platforms available in literature focus on minimizing the usage of memory and power consumptions, they are not capable of supporting the management of tasks that need their real-time execution and fast average response time. We first analyze how to structure periodic or aperiodic task decomposition in the TinyOS-based sensor node platform as regard to guaranteeing the deadlines of ail the periodic tasks and aiming to providing aperiodic tasks with average good response time. Then we present the application and efficiency of the proposed real-time sensor node platform in the sensor node equipped with a low-power 8-bit microcontroller, an IEEE802.15.4 compliant 2.4GHz RF transceiver, and several sensors. Extensive experiments show that our sensor node platform yields efficient performance in terms of three significant, objective goals: deadline miss ratio of periodic tasks, average response time of aperiodic tasks, and processor utilization of periodic and aperiodic tasks.
PHEV용 통합 충전 시스템의 운용 알고리즘에 관한 연구
김병훈(Byoung-Hoon Kim),이백행(Back-Haeng Lee),신동현(Dong-Hyun Shin),정진범(Jin-Beom Jeong),송현식(Hyun-Sik Song),김태훈(Tae-Hoon Kim),김상대(Sang-Dae Kim),허훈(Hoon-Heo),유지윤(Ji-Yoon Yoo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, there is developing the charging management system for supplying a power to a battery of PHEVs. But, it is inefficient and expensive to install for charging several vehicles because it could utilize one to a vehicle. Then, this paper suggests the operating algorithm of the integration charging management system with a main and many posts and explains the process to charge with vehicles at the same time. Therefore, the main system should have central control(or monitoring) functions with the GUI. And a post only have to connect a vehicle.
자동차 부품 사업장에서 주간 연속 2교대 도입 후 노동환경 및 노동자 건강 변화
김병훈(Byoung Hoon Kim),박태준(Taezoon Park) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.2
Objective: The objective of this study is to investigate the effect of implementing of the two-consecutive-daytime shift system on the working conditions including the reduction of working hours as well as workers" health in a car assembly factory in Korea. Background: The two-consecutive-daytime shift replaces day-night shift system in order to reduce night-time working hours and improve the workers" health conditions. The effect of changing shift system is not clearly established yet although there are studies investigating short-term effects. Thus investigating the long-term effects of two-consecutive-daytime shift system can provide the insights on the effectiveness of the new shift system and its influence on the workers" welfare. Method: Questionnaire surveys were conducted in a car-part assembly factory in 2015, 2016 and 2019. In the year of 2015, 2016, the shift system was day-night shift whereas two-consecutive day shift system was already in place in the year of 2019. Total number of 137 (year of 2015), 142 (year of 2016), and 126 (year of 2019) workers participated in the survey on the working environment including working hours, labor intensity and the workers" health conditions, such as, musculoskeletal symptoms, sleep disorders, digestive disorders. The differences before and after the change of shift system are compared by a series of statistical task along with some qualitative analysis on free-form comments. Results: The two-consecutive daytime shift system brought positive results of shorter working hours, increased spare time, rest time and day off. The workers satisfied with their work as well as working hours (p <0.001). Compared to the previous shift system, the health index (PSQI) nighttime decreased from 10.5 to 9.3 (p <0.001), and the daytime sleepiness also decreased from 12.3 to 9.1 (p <0.001). Similarly, the insomnia score decreased statistically significantly from 12.3 to 9.0 (p <0.001) in the new two-consecutive-daytime shift system. In addition, digestive symptoms and musculoskeletal symptoms decreased statistically significantly on the criteria of NIOSH. Change of the shift system influenced on the working conditions, which were focused on the efficiency of the production. The improvement of equipment relieved the workload of lifting, which showed that the physical loads on the waist (p =0.0189) and shoulders (p =0.063) were significantly decreased. On the other hand, the improvement of working conditions increased the efficiency of the production system, and resulted in an increased workload level. Although the ergonomic assessment reduced the inappropriate posture of the waist and shoulders to the point of statistical difference, the overall level of action was not changed as for the statistical difference. The subjective fatigue increased and the movement of the hand and arm also increased. Conclusion: The introduction of consecutive daytime two shift shows positive results in worker health indicators, work and leisure life. However, there was an evidence of intensified work intensity in the process of increasing the efficiency of production in the shorter working hours than the previous shifts system. Application: The findings of this study provides a basis for applying two-consecutive-daytime shift system on a factory.