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동적 우선순위 상한 프로토콜의 스케줄링 가능성 조건 개선
오성흔,양승민,O, Seong-Heun,Yang, Seung-Min 한국정보과학회 2001 정보과학회논문지 : 시스템 및 이론 Vol.28 No.11
실시간 시스템에서 태스크가 공유 자원을 사용할 때 제한되지 않은 우선순위 역전이 발생할 수 있다. 이는 실시간 태스크의 스케줄링 가능성 보장을 불가능하게 한다. 따라서 우선순위 역전을 제한하는 자원 접근 프로토콜들이 연구되었으며 주기적 태스크 집합의 스케줄링 가능성 분석을 위한 충분조건이 제시되었다. 본 논문에서는 동적 우선순위 상한 프로토콜을 사용할 경우 개선된 스케줄링 가능성 충분조건을 제시한다. 제시된 방법에서는 높은 우선순위의 태스크들의 마감시간을 놓치지 않는 범위 내에서 낮은 우선순위를 가진 태스크가 계속 수행될 수 있다는 사실을 이용하였다. 이렇게 함으로써 높은 우선순위를 가진 태스크가 낮은 우선순위를 가진 태스크를 위해서 허용해 줄 수 있는 시간은 높은 우선순위를 가진 태스크의 최악 블록킹 시간에서 제외될 수 있다. 태스크의 최악 블록킹 시간이 감소하게 되므로 동적 우선순위 상한 프로토콜의 스케줄링 가능성 충분조건은 개선된다. When tasks access shared resources in real-time systems, the unbounded priority inversion may occur. In such cases it is impossible to guarantee the schedulability of real-time tasks. Several resource access protocols have been proposed to bound the duration of priority inversion and sufficient conditions are given to guarantee the schedulability of periodic task set. In this paper, we show an improved sufficient condition for schedulability when the dynamic priority ceiling protocol is used. Our approach exploits the fact that a lower priority task can continue to execute as far as the higher priority tasks do not miss their deadlines. This permitting execution time of the higher priority tasks for a lower priority task can be excluded from the worst-case blocking time of the higher priority tasks. Since the worst-case blocking time of tasks can be reduced, the sufficient condition for schedulability of dynamic priority ceiling protocol becomes further tight.
고령친화대학 운영을 위한 뉴욕시 칼리지 링크 사례분석 연구
신혜리(Shin, Hye Ri),손의성(Sohn, Eui-Seong),황정하(Hwang, Jeongha),정지웅(Jeong, Ji-Ung),양승민(Yang, Seung Min),임진섭(Lim, Jin-Seop) 한국지역사회학회 2018 지역사회연구 Vol.26 No.1
Recently, both age-friendly cities and age-friendly universities have been growing at the community level. The types of age-friendly universities could be divided into the community-based age-friendly university and education-focused age-university. Dublin City University in Ireland as the first age-friendly university belongs to the former, New York College Link(NYC College-Link) in the study belongs to the latter. NYC College-Link helps the older New Yorker to connect to the various educational and cultural opportunities provided by the NYC colleges and universities. It also has the searchable database that profiles opportunities for older adults and helps them to learn whatever they want to do. With regard to NYC College-Link, many universities and colleges are utilizing the age-friendly programs. The study was intended to draw out several applicable implications by analyzing in-depth the case of NYC College-Link and age-friendly Universities such as Columbia University, Fordham University, and Kingsborough Community College. As a result, the case of NYC College-Link provides several suggestions for the community-based universities in Korea.
폐 MDF 퇴비화 사용을 위한 생분해 환경 특성에 관한 연구 (Ⅰ)
최철(Chul Choi),류지창(Ji-Chang Yoo),양승민(Seong-min Yang),이창구(Chang-goo Lee),이석언(Seok-eon Lee),강석구(Seog-goo Kang) 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.1
This study is performed that furniture and interior materials of MDFs (Medium Density Fiberboard) biodegradation properties, and the goal of this study is investigation of possibility of waste-MDFs composting after landfilling. To investigate biodegradation, this study was performed according to KS M ISO 14855-1, and there were two different soil conditions including a compost condition and an activated vermiculite condition as artificial soil. This experiment was tested for 40 days. The measurement of carbon-dioxide generation was processed every 24 hour in 1-2 week, and every 48 hour after 3 week. In the same days, MDF showed 24.4% of biodegradation in compost condition, and 6.2% in activated vermiculite. Also, the reference material of TLC (thin-layer chromatography) grade cellulose showed 26.4%, 11.4% in compost and activated vermiculite respectively. The dilution plate method was performed for biological analysis in the study. This experiment was used for investigation of inoculums (Bacillus licheniformis) activity. As the result of bioassay, compost has more other germs include inoculum than activated vermiculite in the first week. Especially in the 2nd week, the reference material under the compost condition showed the most germs activity, and also the biodegradation was the highest. Consequentially, compost condition was able to reduce a performing period of biodegradation testing than activated vermiculite. However, activated vermiculite could be stabilizing errors between repetition.