연령증가에 따른 혈압요소들의 좌심실비대 및 관동맥질환과의 관련성

박재석,박창규,박미영,박재형,김용현,나진오,신성희,서순용,홍순준,박성미,임홍의,김응주,서홍석,오동주,노영무 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

부추 전용 포장 결속기 개발

김용석(Yong-Seok Kim),박성희(Sung-Hee Park),박태표(Te-Pyo Park),양순용(Soon-Young Yang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

An Allium-odorum is difficult material to handling, because it is soft and weak as mechanical. For bundling work of allium-odorum, we must grip in the bundle shape of unit weight, however, it is difficult that grip allium-odorum by hand because the bundle bulk is very big. Especially, in packing work, the bundle shape of allium-odorum package than other vegetables is very important, because difference of a price becomes much according to the bundle shape. In this paper, we propose bundling mechanism for a quadrangle shape in bundle shape, and semi-automatic bundling mechanism that makes use of a eccentric roller and a triangularity link. We carry out mechanical modeling and analysing respectively using the CATIA V5 and SimDesigner. We manufactured the prototype of the semi-automatic bundling machine, and got satisfied result through field test. And this machine will be commercialized and announced soon.

정체수계에 위치한 혼합수역의 수질 전산 모델 개발

박석순,이용석 이화여자대학교 환경문제연구소 1997 이화환경연구 Vol.1 No.-

정체수계에 위치한 혼합수역의 수질을 시뮬레이션할 수 있는 전산모델 PIMIXQ(Plume Integrated Mixing Zone Quality)를 개발하였다. 개발된 모델은 방류 모멘텀이 수질분포 결정에 우세한 근접수역(Nearfield Zone)과 방류수역내 이류와 확산 그리고 생물화학적 반응이 수질변화의 주 결정요인으로 작용하는 원접수역(Farfield Zone)으로 분리하여 각각 차원분석법 (Dimensional Analysis)과 수치해법(Numerical Analysis)을 이용하였으며 정체수계에서 나타나는 주요 현상인 방류 모멘텀과 상류 수체로의 역혼합(Back Mixing) 과정이 포함되었다. 또한 전산결과를 등농도 곡선으로 표현하는 MQCONT(Mixing Zone Quality Contour)와 예측치와 실측치를 그래프상에서 비교할 수 있도록 한 MAPLOT(Mixing Zone Quality Plot)를 개발하였다. 북한강 의암호에 위치한 춘천시 폐수처리장 방류수가 유입되는 혼합수역을 대상으로 모델 타당성 연구가 실시되었다. 수량과 수질조건을 달리하여 총 6회의 현장조사가 이루어졌으며 현장조사시 혼합수역내 수리 및 수질의 수평수직 분포를 측정하였다. 모델적용 결과 예측값과 현장 측정치 사이에 적절한 일치가 이루어졌으며 개발된 그래픽 프로그램을 모델 적용에 유용하게 사용될 수 있었다. A computer model, PIMIXQ(Plume Integrated Mixing Zone Quality), was developed in this study for simulation of water quality in the mixing zone of impounded water systems. The developed model was based on dimensional analysis in nearfield zone where water qualities are controlled by discharge momentum, and on numerical solution of advection-dispersion equation in farfield zone. Several major aspects were included in the developed model such as discharge momentum and back mixing caused by the impoundment of receiving water body. The two graphic tools, MQPLOT(Mixing Zone Quality Plot) and MQCONT(Mixing Zone Quality Contour), were developed in this study to display the model results and the field measurements in screen and printer. The model validation studies were performed on the mixing zone at the Chuncheon Wastewater Treatment Plant effluent which is located in the Lake Uiam, the North Branch of the Han River. Six synoptic field surveys were performed under different ambient conditions, such as flow rate and water quality. The studies included the measurements of horizontal and vertical distribution of the hydraulic nature and water qualities in the mixing zone. There were reasonable agreements between model predictions and field measurements. The graphic tools were effectively utilized during model application.

반응조 나열법을 이용한 하천 모델 개발

박석순,이용석,박민대 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-

The Stochastic Time River Elevator Approach Mode(STREAM)which is a multiconstituent stream ecosystem model was exclusively developed in this study. The formulation of STREAM is based on the Cell-In-Series(CIS)approach where stream is assumed as a series of completly mixed flow reactors. This approach is to use a Lagrangian coordinate instead of an Eulerian such that it can overcome the limitations repoted in the previous stream models, such as QUAL2E.Major constituents included in STREAM are Dissolved Oxygen(DO), Biochemical Oxygen Demand(BOD), Suspended Solid(SS), Coliform Bacteria, Nitrogen Series, Phosphorus Series, and Phytoplankton. Dissolved oxygen change caused by Sediment Oxygen Demand(SOD) and respiration and photosynthesis of periphyton and macrophyte are included in the model structure. STREAM was programed in a BASIC language and graphic was attached. In order to validate STREAM model, both STREAM and QUAL2E (developed by United States Environmental Protection Agency) were applied to the South Branch of Han River under the same amibient condition. The result indicated that STREAM could simulate most water qualities with same accuarcy and less computer time than QUAL3E.

K이 흡착된 Si(111)7×7표면에 대한 RHEED 연구

박종윤,이순보,이경원,안기석,신익조,강건아 성균관대학교 1990 論文集 Vol.41 No.2

상온 및 200℃∼600℃의 Si(111) 7×7 표면에 칼륨(K)을 증착하였을 때의 표면격자구조 변화를 RHEED로 관측하였다. K 증착시 Si(111)7×7 기판의 온도가 상온인 경우, 어느 일정한 증착시간(포화덮임률에 도달했다고 추정되는 증착시간)이 지난 후에는 원래의 깨끗한 Si(111)7×7 패턴과 유사한 Si(111) 7×7-K 패턴이 관측되었고, 증착시간을 증가시켜도 RHEED 패턴은 변화하지 않았다. 이것을 annealing하면 350℃까지는 RHEED 패턴에 변화가 없다가 그 이상의 온도가 되면 서서히 원래의 7×7 패턴으로 되돌아가기 시작한다. Si(111) 7×7기판의 온도를 200℃∼600℃로 유지하면서 K을 일정시간(450℃에서 3×1이 형성되는 증착시간)이상 증착시킨 경우에 250℃까지는 상온의 경우와 비슷한 형태의 변형된 7×7 패턴이 관측되고, 300℃∼550℃일때는 3×1, 550℃ 이상에서는 1×1 구조가 관측되었다. 이때 300℃∼550℃에서 형성된 Si(111) 3×1-K 구조는 450℃에서 1분 정도 annealing 하면 항상 Si(111) 1×1-K 구조로 상전이가 일어남을 관측하였다. Potassium adsorbed surface structures of Si(111) 7×7 surface at room and high temperatures(200℃∼600℃) were investigated by RHEED. Potassium adsorption on the Si(111) 7×7 surface to saturated coverage at room temperature changed the RHEED pattern of Si(111) 7×7 to Si(111) 7×7-K. Subsequent heating of the Si(111) 7×7-K surface above 350℃ results in a Si(111) 7×7 with desorbing K. The RHEED pattern of the K-adsorbed on the Si(111) 7×7 surface up to the adsorption temperature of 250℃ was the modified 7×7 pattern, quite similar to that of the Si(111) 7×7-K, observed at room temperature. The 3×1 structure was observed in the temperature of adsorption between 300℃ and 550℃. Regardless of the adsorption temperature, a phase transition always took place from the Si(111) 3×1-K structure to Si(111) 1×1-K after annealing at 450℃ over 1 minute.

일본 율령국가의 왕권과 대 신라외교 : 8세기 사절 방환 사례를 중심으로

朴昔順 한국고대사학회 2002 韓國古代史硏究 Vol.25 No.-

In the ancient statute of Japan, Shilla is described as a 'barbarian country(蕃國)'. Japanese scholars have in general interpreted it as an indication of superiority that Japan had felt over Shilla. In terms of the diplomatic relationship in the 8th century with Shilla, Japan has explained the bilateral tie based on how the ancient Japan perceived the other part of the world with an emphasis on the concept found in the statute. Regarding this, the paper looks at the relationship between the ancient Japan and Shilla with its focus on an article of the 'Return of Envoys from Shilla' and the domestic political situation of Japan. In particular it was reviewed from the point of sovereignty of ancient Japan. In a nutshell, 'Return' implies a simple return and the expression was widely used in the east Asian region back then. It was also revealed that the Japanese government set certain conditions on which envoys from Shilla are returned without being allowed them to enter the capital depending on domestic circumstances. And most of all, it should be kept in mind that political request made by the Japanese sovereignty officially has many things to do with the issue of the 'Return' of envoys from Shilla.

해안 매립에 따른 항내 조류변화 예측

박석순,박재우 이화여자대학교 환경문제연구소 1997 이화환경연구 Vol.1 No.-

This paper presents the results from a hydrodynamic model study to predict the impacts of coastal reclamation in Pusan harbor system using RMA2 which is a tidal flow model of the US Army Corps of Engineers' TABS-2 system. A finite element mesh was constructed and refined to cover the complicated geometry of Pusan harbor system and the proposed reclamation area. The model was calibrated to tidal elevation and currents measured during spring fall syzygys. Under the three different tidal conditions including summer winter syzygys, spring fall quarters, and summer winter quarters, the model predictions were compared with the field measurements both in tidal elevation and current. In all cases, there were excellent agreements between the model predictions and the field measurements. The validated model was then used to predict the changes in tidal current and elevation that might occur due to the coastal reclamation. It was predicted that there would be no change in tidal elevation of this system after the reclamation. In tidal current, however, discernible changes were predicted near the proposed reclamation area both in magnitude and direction.

사회환경교육의 교육과정 표준화 모형 및 통합프로그램 개발연구

박석순,최돈형,성효현,허명,강명희,이숙임,남상준 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-

This paper presents the development of standardized modules and an integrated program which will be used for social environmental education. The study objectives are to develop modules which are based on various environmental topics, to relate the regional environmental topics to the educational modules and program, and to include the demand of students in the modules and program. Literature and questionary surveys, as well as, module development method were utilized as research tools. The titles of developed modules are "The Green Plant Earth," "Unexpected Resources: Save Resources and Recycle", "Water as the Mother of All Lives", "The Blue Sky with Clean Air", and "Soil as the Home of All Living and Non-living Things". It is hoped that the developed modules and program are utilized as course materials and curriculum for social environmental education in various educational institutes. The study results will be materialized as multimedia in near futher.

미국 뉴저지주 매차포닉강의 수질 모델 연구 : 오염 부하량 분석

박선순,크리스토퍼 유클린 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-

보정 및 검정 완료된 수질 모델을 이용하여 폐수 처리장 확장에 따른 안정 오염 부하량 분석이 실시되었다. 분석한 수질 현상은 생활 하수 유입 하천에서 일반적으로 나타나는 세가지 주요 현상 즉, 1) 용존산소, 2) 암모니아 독성, 그리고 3) 부영양화이다. 여름과 겨울에서의 갈수유량(7Q10)과 이때 나타나는 온도를 예측시 하천 임계 조건으로 가정하였다. 이 예측은 하천 수질에 악영향을 미치지 않는 방류수 수질 기준을 여름과 겨울에서 각각 결정하였으며 Utilizing the constructed water quality model, the waste load allocation analysis was performed for the purpose expansion of wastewater treatment plant. The projected water quality parameters were three major aspects in the streams of municipal wastewater effluents: 1) dissolved oxygen level, 2) ammonia toxicity, and 3) nutrient/eutrophication. The 7Q10 flow rates for both summer and winter periods and the temperatures associated with these periods were used as the critical stream conditions The projections determined the acceptable treatment levels for the purposed discharges during winter and summer periods, including dissolved oxygen, biochemical oxygen demand, ammonia nitrogen, total kjeldahl nitrogen, total organic phosphorus, total dissolved phosphorus, pH, and alkalinity.

Cs이 흡착된 Si(111)7×7표면에 대한 RHEED연구

박종윤,이순보,이경원,안기석,강건아 성균관대학교 1991 論文集 Vol.42 No.1

Cesium-adsorbed surface structures on Si(111)7×7 were investigated at room and high temperatures(200∼700℃) by RHEED. The RHEED patterns of Si(111) 7×7 was changed to the modified 7×7 and the 1×1 patterns with increasing the deposition times of Cs at RT. It was observed that the structure of the Cs-adsorbed Si (111) 7×7 surface at saturation coverage is the 1×1 structure at RT. The ◁그림삽입▷(원문을 참조하세요) 1 and 1×1 structures appeared successively at the adsorption temperature of 300℃, 350∼400℃ and 450℃, respectively. After subsequent heating of 1×1 surface above 550℃ and of ◁그림삽입▷(원문을 참조하세요) surface above 600℃, each RHEED pattern gradually returned to the original Si(111)7×7 pattern. 상온 및 200∼700℃의 Si(111)7×7 표면에 Cs(Cesium)을 증착하였을 때 표면격자구조의 변화를 RHEED로 관측하였다. Cs 증착시 Si(111)7×7 기판의 온도가 상온인 경우, 포화 덮임률에 도달했다고 추정되는 일정 증착시간 전에는 원래의 깨끗한 Si(111)7×7 패턴과 거의 유사한 변형된(modified) Si(111)7×7-Cs 패턴이 관측되었다. 그후 포화 덮임률에서는 1×1패턴이 관측되고 증착량을 증가시켜도 패턴의 변화는 관측되지 않았다. 이 구조를 다시 annealing시키면 약 550℃부터 서서히 원래의 7×7구조로 되돌아가기 시작한다. Si(111)7×7기판의 온도를 220∼700℃로 유지하면서 Cs을 증착시킨 경우에 약 250℃까지는 상온에서와 비슷한 변형된(modified) 7×7이 관측되고 약 300℃에서는 ◁그림삽입▷(원문을 참조하세요) 350∼400℃ 정도에서는 ◁그림삽입▷(원문을 참조하세요)과 3×1이 겹쳐셔 관측되었다. 그리고 450℃ 이상에서는 1×1구조가 관측되었다. 이때 약 300℃에서 형성된 ◁그림삽입▷(원문을 참조하세요) 350℃에서 형성된 ◁그림삽입▷(원문을 참조하세요) 3+3×1 구조는 약 500℃ 정도까지 다시 annealing함에 따라 다리 1×1구조로 상전이가 일어난후, 약 600℃부터 원래의 7×7의 초격자점들이 나타나기 시작했다. 이들 결과로부터 Si(111)7×7 표면에 Cs을 증착하는 경우에는 일정한 포화 덮임률(saturation coverage)이 있는 것으로 추정되고, 이 덮임률에서 관측된 고온에서의 상전이는 증착량(증착시간)에는 무관하고 온도에만 의존함을 알 수 있었다. 또한 1×1 구조와 ◁그림삽입▷(원문을 참조하세요) 구조에 대하여 Cs의 탈착은 각각 약 550℃와 600℃에서 일어나기 시작하여 700℃에서 완전히 탈착됨을 알 수 있었다.