1980년 이후 목조 건축문화재 지붕부에 사용된 산자 재료의 지역별 특성 및 수리 시기별 변화

박새미,장헌덕,권양희,Park, Sae-mi,Chang, Hun-Duck,Kwon, Yang-hee 한국건축역사학회 2021 건축역사연구 Vol.30 No.3

San-ja is one of the main members consisting of the roof of traditional wooden buildings in Korea. In this study, the regional characteristics of the materials used in San-ja and changes of the materials over time were examined. To this end, 123 documents on the repair of wooden architectural heritage recorded since the 1950s were reviewed. It was found that there was a difference in the San-ja material by region because of the diversity in the conditions of material supply. For instance, bamboo was the most frequently used material in Jeollanam-do province because it was readily available. However, with the development of transportation and vehicle, the regional characteristics have disappeared. As a result, the material has been unified with bamboo now. This is because bamboo is specified as a representative material in the specification or the convenience of construction is prioritized. In addition, the social and economic conditions at the time of repair had an influence on the selection of the San-ja materials.

분산 파일시스템을 위한 효율적인 협력캐쉬 알고리즘

박새미(Park Sae-Mi),이석재(Lee Seok-Jae),유재수(Yoo Jae-Soo) 한국콘텐츠학회 2003 한국콘텐츠학회 종합학술대회 논문집 Vol.1 No.2

분산 파일시스템 환경에서는 디스크 접근 비용을 줄이기 위해 각 노드에 캐쉬된 데이터를 서로 공유하는 협력캐쉬 기법이 사용된다. 협력캐쉬 기법은 분산되어있는 시스템들의 캐쉬정보를 서로 공유하여 가상으로 더 큰 캐쉬를 형성함으로써 캐쉬 히트율을 높이고 디스크 접근을 줄이는 방법이다. 기존에 제안된 협력캐쉬 기법들은 캐쉬에 대한 근사정보를 이용하여 메시지 비용을 줄이고, 로컬캐쉬영역과 글로벌 캐쉬영역을 가변적으로 사용하여 캐쉬히트율을 높이고 있다. 또한 캐시교체시 교체된 블록을 비활동적인 노드로 보내어 계속 캐쉬에 유지하도록 하여 글로벌 캐시히트율을 높이는 장점을 갖는다. 그러나 잘못된 근사정보가 성능을 저하시킬 수 있으며 일관성 유지를 위한 메시지교환 비용이 많이 든다는 단점을 갖고 있다. 또한 비활동적인 노드를 선정하기 위해 사용되는 각 노드의 에이지정보 관리비용이 많이 드는 단점을 갖고 있다. 본 논문에서는 정확한 캐쉬정보를 유지하며 일관성 유지비용과 캐시에이지정보 관리비용을 최소화시키는 협력캐쉬 알고리즘을 제안한다. 그리고 성능평가를 통해 기존의 협력캐쉬 기법과 비교하여 제안하는 알고리즘의 우수성을 보인다. In distributed file-systems, cooperative caching algorithm which owns the data cached at each node jointly is used to reduce an expense of disk access. Cooperative caching algorithm is the method that increases a cache hit-ratio and decrease a disk access as it holds the cache information of distributed systems in common and makes cache larger virtually. Recently, several cooperative caching algorithms decrease the message costs by using approximate information of the cache and increase the cache hit-ratio by using local and global cache fields dynamically. And they have an advantage that increases the whole field hit-ratio by sending a replaced block to the idel node on cache replacement in order to maintain the replaced block in the cache field. However the wrong approximate information deteriorates the performance, the concistency maintenance goes to great expense to exchange messages and the cost that manages Age-information of each node to choose the idle node increases. In this thesis, we propose a cooperative cache algorithm that maintains correct cache information, minimizes the maintains cost for consistency and the management cost for cache Age-information. Also, we show the superiority of our algorithm through the performance evaluation.

약시안에서 아트로핀 처벌치료의 약리 효과

박선호,박새미,조아란,박성희,Sun Ho Park,MD,Sae Mi Park,MD,A Ran Cho,MD,Song Hee Park,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.4

Purpose: To analyze the pharmacologic effect of atropine penalization in amblyopic eyes. Methods: Distant and near visual acuity, near point of accommodation (NPA), and pupil size were measured in the sound eye of 40 children with amblyopia before and after receiving atropine sulfate 1% solution. Amblyopic children were divided into 2 groups according to the time of follow-up visit: 4-days and 7-days after injection; the same tests were performed on all the scheduled follow- up visits. This study included a control group of 20 normal children who received the same test on the initial visit and the scheduled follow-up visits. Results: Visual acuity of the sound eye at distance showed greater decreases in children with 4-day follow-up visits compared with 7-day visits in the amblyopic group (<em>p</em> = 0.24). There was no significant difference in near visual acuity between the amblyopic group and the normal control group by follow-up interval (<em>p</em> = 0.98, <em>p</em> = 0.75). Near point of accommodation significantly increased in the 4-day visit group in both the amblyopic and the normal control groups (<em>p</em> = 0.04 and <em>p</em> = 0.03, respectively), Pupil size was significantly maintained in the 4-day visit, amblyopic group (<em>p</em> = 0.01). Conclusions: Atropine effectively decreased the vision of the sound eye in amblyopic children. However, to maintain the pharmacologic effect, two separate atropine instillations per week (on a weekday and the weekend) should be considered as a treatment for amblyopia. J Korean Ophthalmol Soc 2014;55(4):590-595

실시간 데이터베이스 시스템을 위한 효율적인 병행실행제어 알고리즘 설계

이석재 ( Seok-jae Lee ),박새미 ( Sae-mi Park ),강태호 ( Tae-ho Kang ),유재수 ( Jae-soo Yoo ) 한국인터넷정보학회 2004 인터넷정보학회논문지 Vol.5 No.1

실시간 데이터베이스 시스템의 트랜잭션은 마감시간과 같은 시간 제약조건을 갖는다. 따라서 트랜잭션은 마감시간 내에 완료되어야 하며 동시에 데이터 일관성 제약조건을 만족해야 한다. 빠른 평균 응답시간 제공을 목표로 하는 기존 데이터베이스 시스템과 달리 실시간 데이터베이스 시스템은 트랜잭션의 마감시간 초과 비율과 마감시간을 초과한 트랜잭션에 의해 발생되는 비용에 의해 평가된다. 따라서 실시간 트랜잭션은 공정성과 시스템 처리율의 저하를 발생시킨다 하더라도 트랜잭션의 중요도 및 마감시간에 따라 스케줄링 되어야 하고, 항상 높은 우선 순위 트랜잭션의 선행 처리가 보장되어야 한다. 본 논문에서는 기존 실시간 스케줄링 알고리즘들이 갖는 문제점을 개선시킬 수 있는 새로운 스케줄링 알고리즘(Multi-level EFDF)과 펌, 소프트 실시간 트랜잭션을 고려한 병행실행제어 알고리즘(2PL-FT)을 제안한다. 또한 성능평가를 통해 2PL-FT와 AVCC 방법에 대한 트랜잭션의 재시작 비율 및 마감시간 초과 비율을 비교한다. 이 실험들을 통해 제안하는 2PL-FT 알고리즘이 기존에 제안된 방법들보다 더 우수함을 보인다. Real-time database systems (RTDBS) are database systems whose transactions are associated with timing constraints such as deadlines. Therefore transaction needs to be completed by a certain deadline. Besides meeting timing constraints, a RTDBS needs to observe data consistency constraints as well. That is to say, unlike a conventional database system, whose main objective is to provide fast average response time, RTDBS may be evaluated based on how often transactions miss their deadline, the average lateness or tardiness of late transactions, the cost incurred in transactions missing their deadlines. Therefore, in RTDBS, transactions should be scheduled according to their criticalness and tightness of their deadlines, even if this means sacrificing fairness and system throughput. And it always must guarantee preceding process of the transaction with the higher priority. In this paper, we propose an efficient real-time scheduling algorithm (Multi-level EFDF) that alleviates problems of the existing real-time scheduling algorithms, a real-time concurrency control algorithm (2PL-FT) for firm and soft real-time transactions. And we compare the proposed 2PL-FT with AVCC in terms of the restarting ratio and the deadline missing ratio of transactions. We show through experiments that our algorithms achieve good performance over the other existing methods proposed earlier.

학습전략이 학업성취에 미치는 영향: 학습자 특성과 중재조건에 따른 메타분석

김동일 ( Kim Dongil ),안예지 ( An Yeji ),오지원 ( Oh Jiwon ),윤지수 ( Youn Jisoo ),박새미 ( Park Sae-mi ),최수미 ( Choi Sumi ) 인하대학교 교육연구소 2018 교육문화연구 Vol.24 No.5

본 연구의 목적은 학습전략 중재가 학업성취에 미치는 효과를 분석하는 것이었다. 분석대상 논문은 1995년부터 2017년까지 출판된 학술논문 총 71편으로 각 연구에서 산출된 효과크기는 연구대상 관련 변인, 중재 관련변인, 중재효과 관련변인에 따라 분석되었다. 연구결과, 학습전략 중재의 전체효과는 중간 효과크기와 큰 효과크기 사이에 해당하며, 통계적으로 유의하였다. 변인에 따른 학습전략 중재의 효과는 1) 연구대상 관련변인의 학교급 측면에서는 초등학교 저학년에서 가장 큰 효과크기를 보였고, 학습자 특성 측면에서는 일반, 학습부진, 통합집단에서만 통계적으로 유의한 효과가 나타났다. 2) 중재 관련변인에서 중재집단 크기는 일대일, 소집단과 혼재형, 대집단 또는 전체학급의 순서로 모든 값이 유의하였다. 중재 회기수는 11회기 이상 20회기 이하일 때, 학습전략 유형은 상위인지전략이, 그리고 검사도구는 표준화 검사도구를 활용하였을 때 가장 큰 효과크기를 나타냈다. 3) 중재효과 관련변인은 국어, 수학 영역에서 학습전략 중재를 적용하였을 때의 효과크기가 큰 것으로 나타났다. 이와 같은 결과를 바탕으로 본 연구의 함의와 후속 연구에 대하여 논의하였다. The purpose of this study was to analyze the effects of learning strategy interventions on academic achievement. A total of 71 studies that published from 1995 to 2017 were analyzed. The effect size(ES) calculated from each study was analyzed according to participant-related, intervention-related, and dependent variables. As a result, the overall ES of the learning strategy intervention was between medium and large, and was statistically significant. The effect of the learning strategy intervention according to variables was as follows: 1) in the participant-related variables, the largest ES was found in the lower grades of elementary school students and the statistically significant ESs were found in general, underachieving, and integrated groups; 2) in the intervention-related variables, all group sizes were significant in order of one-to-one, small, mixed group, large group or whole class. 11-20 sessions, metacognitive strategies, and standardized measurements indicated the largest ESs; 3) in the dependent variables, the effect of learning strategies in Korean and mathematics were large. Based on these results, implications and suggestions for further studies were discussed.

감초(Glycyrrhiza uralensis) 잎 추출물의 분획별 총폴리페놀, 플라보노이드 및 항산화 활성 차이

박경배(Jing-Pei Piao),김원우(Won-Woo Kim),배상윤(Sang-Youn Bae),박새미(Sae-Mi Park),조동하(Dong-Ha Cho) 한국약용작물학회 2013 한국약용작물학회 학술대회논문집 Vol.2013 No.1

수소 캐리어를 위한 CO₂-free 암모니아 합성기술 동향

김지현(Jihyeon Kim),김진호(Jin-Ho Kim),김효식(Hyo Sik Kim),류재홍(Jae-Hong Ryu),강석환(Suk-Hwan Kang),박새미(Sae-Mi Park),정석용(Suk-Yong Jung),이수출(Soo-Chool Lee) 한국에너지기후변화학회 2020 에너지기후변화학회지 Vol.15 No.1

Fossil fuel is a material that is actively used and occupies a significant portion of energy sources. However, environmental pollution occurs due to the use of fossil fuel, research has been actively conducted around the world to develop an alternative energy source. Particularly, as interest in hydrogen energy increases, interest in a medium capable of storing and transporting it also increases. Ammonia, which will be discussed in this paper, not only acts as a storage and transport medium for hydrogen, but is also used as a direct fuel in internal combustion engines or gas turbines due to the combustion characteristics of ammonia. In general, a ton of ammonia requires a significant amount of energy (9 ~ 15 MWh) to be produced and energy loss can occur through the conversion process. Nevertheless, the importance of ammonia as an energy carrier in recent years has been expanding R&D and investment mainly in Australia and Japan. This paper introduces the current state and level of technology developments such as thermal catalyst, electrocatalyst, photocatalyst and chemical roofing for ammonia synthesis.