RPSim: Manycore 를 위한 범용 실시간 성능 시뮬레이터

정병관 ( Byung Kwan Jung ),이선우 ( Sunwoo Lee ),김지민 ( Jimin Kim ),유민수 ( Minsoo Ryu ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2

실시간 시스템 개발에 있어서 태스크들의 응답시간을 예측하는 것은 가장 중요한 문제로 인식되고 있다. 그러나 manycore 환경에서는 응답시간을 예측하는 것이 몹시 어려워 만족할 만한 결과를 이끌어내지 못하고 있다. 과거에 스케줄링과 동기화 정책을 고려하여 최악응답시간을 예측하는 방법이 제시되기도 했지만, 상당히 제한적인 태스크 모델을 가정하여 실제로 적용하기에는 어려울 뿐만 아니라 예측한 결과도 시스템의 정확한 응답시간과 상당한 괴리가 있다. 반면, 시뮬레이션 기법은 시스템의 스케줄링 상태를 시뮬레이션해 봄으로써, 상대적으로 정확한 응답시간을 예측하는 것을 가능하게 한다. 따라서 본 논문에서는 범용적이면서도 매우 효과적인 manycore 를 위한 시뮬레이션 기법을 제안한다. 제안하는 기법의 우수성은 시스템 모델의 변화에 따라 소요되는 시뮬레이션 시간을 측정하는 실험을 통해서 확인한다.

영산강 동계 조류 대발생 기간의 규조류 Stephanodiscus spp. 출현양상과 형태적 분류

정병관 ( Byung Kwan Jeong ),김용재 ( Yong Jae Kim ),정승원 ( Seung Won Jung ),이학영 ( Hak Young Lee ),신용식 ( Yong Sik Shin ) 한국하천호수학회 2014 생태와 환경 Vol.47 No.4

We conducted the weekly monitoring (December 2012~April 2013) to evaluate the temporal variation and identification of Stephanodiscus spp. that are generally dominant during winter in the Yeongsan River. Phytoplankton species were identified and counted using the optical microscope and scanning electron microscope (SEM). Phytoplankton in the river were grouped into 6 classes (bacillariophyceae, chlorophyceae, cryptophyceae, cyanophyceae, dinophyceae, euglenophyceae), 30 genus and 41 species. Phytoplankton composition showed high abundance of diatoms in winter and Aulacoseira sp., Cyclotella sp. and Stephanodiscus spp. were dominant. Among the species, Stephanodiscus spp. was relatively abundant compared to other diatom species. Stephanodiscus spp. appeared from December 2012 to April 2013 and their abundance peaked in January. Abundance of diatoms especially peaked (21,080 cells mL-1) in January 15, 2013 when Stephanodiscus spp. also bloomed (20,560 cells mL-1). The abundances of Stephanodiscus spp. were gradually decreased from March and reached as low as 60 cells mL-1 in April 26. Cyclostephanos (C. invisitatus), Cyclotella (C. meneghiniana), Discostella (D. pseudostelligera, D. woltereckii) and Stephanodiscus (S. hantzschii, S. minutulus, S. parvus) were classified in the circular diatoms. Abundance of S. hantzschii was extremely high compared to S. minutulus and S. parvus.

탄소 및 질소 안정동위원소 비를 이용한 영산강하구역 유기물 기원 추정 연구

이연정 ( Yeon Jung Lee ),정병관 ( Byung Kwan Jeong ),신용식 ( Yong Sik Shin ),김성환 ( Sung Hwan Kim ),신경훈 ( Kyung Hoon Shin ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2

Organic carbon and total nitrogen stable isotope ratios of suspended materials were determined at 3 stations (from Mongtan Bridge to Youngsan river estuary barrage) (n=6, each) from November 2008 to August 2009, in order to understand the origin of particulate organic matter at the Estuary of Youngsan River. Allochthonous organic matter, ammonia-N and silicate were increased after heavy rain (in August). Carbon isotope ratios were significantly different between stations in November and August, and it was possible to determine the origin of organic matter. The heavier nitrogen isotope ratios, as well as higher phosphate concentrations, were found in November than other sampling times. Livestock wastewater and farmland input was likely the main causes of these high values. In addition, YS3 station, the nearest site to estuary barrage, appears to be affected by a substantial amount of livestock wastewater and farmland input, considering that nitrogen isotope ratios were heavier than those at the upper sites. These results suggest that the analysis of stable isotope ratios is a simple but useful tool for the determination of organic matter origin in aquatic environments.

멀티프로세서 임베디드 소프트웨어를 위한 컴포넌트 기반 설계 및 성능분석 방법

이선우 ( Sunwoo Lee ),정병관 ( Byung Kwan Jung ),유민수 ( Minsoo Ryu ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2

현재까지 소프트웨어 개발을 위한 많은 컴포넌트 기술들이 연구되어 왔다. 하지만 기존의 기술들은 멀티프로세서 환경에서 사용하기에 적합하지 못하다. 멀티프로세서 임베디드 소프트웨어를 구성 하는 다수의 쓰레드들이 병렬적으로 수행될 수 있고, 그로 인한 성능 문제 또한 고려되어야 하기 때문이다. 본 논문에서는 새로운 컴포넌트 모델과 태스크 모델, 그리고 소프트웨어 설계 과정을 제안한다. 그리고 컴포넌트 모델과 태스크 모델 사이의 변환 과정 및 병렬성 극대화를 위한 태스크 분할 과정을 소개하여, 최종적으로 성능분석이 가능한 멀티프로세서 임베디드 소프트웨어 개발 과정을 제시한다.

테스팅을 고려한 설계 모델 및 모델 기반 테스트 케이스 도출 방법

김태웅(Taewoong Kim),정병관(Byung Kwan Jung),유민수(Minsoo Ryu) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2

테스팅의 중요성이 부각되면서 소프트웨어 테스팅의 자동화를 위한 연구가 많이 진행되어 왔다. 기존의 기술들은 행위, 상태 다이어그램과 같은 실행모델을 바탕으로 테스트 케이스를 생성한다. 이 방법은 규모가 큰 소프트웨어서는 테스트 케이스를 생성하기 어렵다. 또한 소프트웨어의 멀티태스킹을 고려한 테스트 케이스 생성 방법에 대한 연구가 많지 않다. 본 논문에서는 실행모델이 아닌 요구사항으로부터 테스트 케이스를 생성하고 태스크의 이벤트 정보를 이용하여 멀티태스킹을 고려한 테스트 케이스 생성 방법을 제안한다.

벼의 倒伏程度가 生育 및 收量에 미치는 影響에 관한 硏究

鄭炳官 조선대학교 농업연구소 1982 農業硏究 Vol.1982 No.1

1981 年 8月 31日부터 9月 3日까지 27m/sec 의 强風에 依한 Agnes 颱風이 本道 東南釜 海岸地 帶를 휩쓸때 發生하는 벼의 倒伏被害程度와 輕減對策을 略述하면 다음과 같다. 1) 稈長이 80cm 以上의 系統에서는 倒伏程度가 더욱 심하였다. 2) 統一系는 一般系에 比하여 倒伏에 依한 減收度가 적었다. 3) 生育期別 倒伏被害는 生育初期被害가 後期生育被害 보다 극심하였다. 4) 輕減對策으로서 倒伏被害直後 l日以內에 6株씩 묶어줌으로서 倒伏放置區에 比하여 10%以上 增收시킬 수 있었다. Our province had got strong typhoon that was Agues with 27m/sec seped from Aug. 31th to Sep. 3rd. The regions were East-South coast paddy field. When the Agnes typhoon went through our coast region, rices on the field were appearence lodging injure. So I will public a report of effect which is growth and field by lodging injure as such as following content. 1. lodging injure was larger in plant hight taller thanof as Japonica type. 2. Degree of decreasing yield of rice lodging injurewas serious In Japonka type in compare with Indica type. 3. lodgiug injure different growing stage was showed extream thing in early growing stage in compare with last growing stage. 4. Decreasing method from lodging injure of rice was a bundle of 6 hills wi thin 24 hours after gettinglodging. It showed 10 % increasing yield then control treatment.

한국 표현주의 회화

정병관 이화여자대학교 한국문화연구원 1984 韓國文化硏究院 論叢 Vol.45 No.-

The Expressionist tendency in Korean painting which was evolved in 1950s world, in fact, find its root in the traditional Far-eastern art, specifically in the so-called 'litterati' genre painting formalized in the manner of Jol-Pa. The Jol-Pa style of painting relied heavily on the artists intuition and impulse represented in a highly expressive technique. The intuitive or spiritualistic content has also been the key element in Fauvism and German Expressionism, the aspect of which seemed to have been ironically imported back into Korean soil through her neighboring, and then more modernized country, Japan. Seen in the light of the history of modern Korean painting, those who specialized in western painting assimilated Expressionism into their art much earlier than the artists who worked in the area of eastern painting. This was perhaps due to the fact that the former much more so than the latter went to study art in Japan, the only source of inspiration for modernism at the time. The Korean artists who went to Japan to study in the 1930s learned Fauvism and Expressionism which were new at the time and therefore in vogue among the Japanese avant-gardes, came back with that experience and became the respected leaders of modern art in Korea. 'Korean' Expressionism was, as it was acquired through Japan not close to 1920s and 30s. Consequently, Korean Expressionist painting never grasped the symbolic or philosophical basis of Expressionism, but were merely concerned with the expressiveness of pathetic emotions such as despair, deprivation, fear and anxiety. The expressions of despair or general pessimism were intensified by the gloomy atmosphere which pervaded in Korea immediately after the horrors and miseries of the Korean War. The deep sentimentality and anguish is similar to that of the French Expressionists after World War Ⅱ. Formally speaking, the eclecticism that combined Fauve-Cubist elements with Expressionist style or content is characteristic of most of Korean Expressionist painters with the exception of a few artists like Lee, Joong-Sup who seems to have captured the real essence of German Expressionism by unifying spiritual content with intense color and violent brushwork. This can be explained by the fact that Korean artists during the period beween 1910 and 1930 accepted influences from the West without reservation or digestion of their true character. The eclectic tendency observed both in the history of modern western Korean painting and in the traditional Korean art may not be coincidental. To be more specific, the eclecticism in painting that had continued from the late Koryo dynasty to the end of the Lee dynasty persisted through the 1950s. The tendency finally disappeared in the 1960s when Korean artists went to Paris to acquire first-hand knowledge of modern art and returned home with Informal abstraction. In retrospect, the 1950's were the most difficult year for Korea. The outbreak of the Korean War in 1950, tragic loss of precious lives and fortunes, anguish and despair, disillusion and deprivation, were all conditions of the Expressionist tendency in Korean art at the time. We find similar gloom and pessimism in other areas of visual arts and literature.

異常氣象이 벼의 生育과 收量에 미치는 影響

鄭炳官,金容在,金東觀 全南大學校 農業科學技術硏究所 1997 農業科學技術硏究 Vol.32 No.-

1980年度 벼 減數分裂期의 異常低溫과 寡照現象 등 異常氣候條件에서 標高別에 따른 品種別 및 移秧期別로 全羅南道 求禮郡 山間地域의 一般 農家畓에서 生育의 進展度와 이에따른 主要 形質들의 變化를 調査分析한 結果를 要約하면 다음과 같다. 1. 出穗 遲延現象은 日本型에 비하여 統一系型이 그리고 早植에 比하여 晩植이 顯著하였고, 이 現象은 標高가 높아짐에 따라 더욱 심하였으며, 標高 100m씩 높아짐에 따라 平均 5日이 遲延되었다. 2. 生育의 進展抑制에 따라 主要 形質들의 變化는 品種 및 移秧期에 따라 差가 있었으나, 標高가 100m씩 높아짐에 따라 平均 4.5㎝가 짧아졌으나, 穗長은 增減變化가 없었다. 3. ㎡當 穗數는 標高 200m 以下에서는 增減變化가 없었으나, 200m 以上에서는 14∼16%가 減少하였고, 4. 穗當粒數 및 登熟率은 標高 100m씩 높아짐에 따라 각각 15粒 및 6.7%가 平均的으로 減少 하였으며, 5. 玄米種은 早植의 경우 400m 以上의 高標高에서 78%, 200∼400m에서 41∼67%가 減 收하였으나 晩植의 경우 300m 以上의 高標高에서 78%가 減收하였다. This study was carried out to improved the rice cultivation method under unusual weather condition such as low temperature and deficiency of sunshine hours of meiosis stage of rice in 1980. Investigation was taken with different varieties, transplanting time and altitude in farm land. Investigation region was mountainous area in Ku-Rae, Chonnam Province, Heading time was remarkable delay in the Tong-il pedigree. It was 5 days delay average according to raise of 100m altitude and culm length was observed 4.5㎝ shortage too but panicle length did not any change. The decreasing of panicle number(14∼16%), ripened grain(6.7%) was observed according to the raise of 100m altitude and brown rice yield was decreased of 41% in the 150∼200m, of 57% in the 200∼300m, of 67% in 300∼400m and 78% over the 400m altitude in early planting because of the decreasing of yield components when compared with those of plain land. But decreasing degree of yield was observed 78% over the 300m altitude when was planted late.

浸冠水 程度가 벼 生育 및 收量에 미치는 影響에 관한 硏究

鄭炳官 조선대학교 농업연구소 1982 農業硏究 Vol.1982 No.1

가 ) 12時間 浸冠水에서는 被害率이 적었으나 36時間 以上 冠水되면 被害率이 커서 收量이 급강되었다. 나 ) 農家 및 栽培法이 서로 달라서 稈長 穗數 및 穗當粒數等 生育양상은 말랐으나 冠水時間에 따라 登熟率 및 精玄比率等이 고도의 有意性을 보여 冠水時間이 많을수록 收量이 떨어졌다. 다 ) 冠水當時 糊熟期인 統一系 品種은 12時間 冠水에서는 8%미만의 被害率을 보였고 60 時間 冠水에서는 60% 정도 감수를 보인반면 乳熟期인 洛東벼는 그 減收幅이 커서 60時間 冠水에서는 72% 의 減收를 보였다. We carried a study on decreasing of flooded rice in Bo-sung Jang-heng region. This results are summerizedas follow as. 1. Flooding hours of rice were lower damage rate in 12 hours but yield damage was higher when flooded houre were 36 hours to rice top. 2. Culm Jength, panicle number and grains perapanicle were difference by cultivation method of farmer but ripening rate and rate of winnowed paddy and husked rice showed signification difference when flooded hour were various. Instantly, yield was decreased when flooded hour was long. 3. Tong-il variety in dough stage was 8 % injure in 12 hours of flooded time and 60 hours of flooding time showed 60% decreasing of yield but Nak-dong rice in milk stage showed 72% decreasing of yield.

참깨 播種期別 Mg,Zn 및 B의 施用이 主要形質에 미치는 影響

鄭炳官,金容在,金東觀 全南大學校 農業科學技術硏究所 1995 農業科學技術硏究 Vol.30 No.-

This study was conducted to improve of major characteristics and yield of sesame(Sesamum indicum L.) by different seeding time and major base nutrient. Seeding time had 2 times which were May 24th(mono-cropping system) and June 12th(secand-cropping system). Major base nutrients application were Magnesium sulfate, Zinc sulfate and Boron. Dry matter production of early growth state became effectively by zinc sulfate, Boron and Magnesium sulfate application. Top dry weight of second-cropping system became effectively increasing by Magnesium sulfate and Zinc sulfate application. Capsule number per plant of mono-cropping system were higher in Boron, Magnesium sulfate + Zinc sulfate + Boron and Zinc sulfate + Boron application, and grains per capsule of second-cropping system were higher in Magnesium sulfate + Zinc sulfate, Zinc sulfate and Boron application. Seed yield increased 23.5% by Zinc sulfate, 22% by Magnesium sulfate + Zinc sulfate + Boron, 21% by Zinc sulfate + Boron application than control(42.2 kg/10 a) in mono-cropping system and 21.8% by Zinc sulfate, 17% by Magnesium sulfate + Zinc sulfate + Boron, 16% vy Boron application than control(22.9 kg/10 a) in second-cropping system.