오원천의 식물플랑크톤 군집에 대한 연구

주현수,김진,박종천,정원석,송현철,이용탁,이우범 國立麗水大學校 環境問題硏究所 2004 環境硏究論文集 Vol.6 No.-

We carried out a study on phytoplankton community at Owon stream, Jeollabukdo, Korea. The author have examined 83 taxa of the phytoplankton from researched area. These were composed of 5 classes, 11 orders, 21 families, 44 genera, 79 species, and 9 varieties. The composition of occurrence species were as follows: green algae are 48.2%, diatoms are 33.7%, blue green algae are 10.8% and etc(7.3%). Dominant species were Chlamydomonas angulosa, Pandorina morum, Coelastrum microporum, Scenedesmus quadricauda, Staurastrum gracile, Melosira varians, Me. italica, Synedra ulna, Sy. acus, Cocconeis placentula, and Cymbella tumida. The standing crops varied from 1,650cells/ℓ to 47,000cells/ℓ. Phytoplankton density of Owon stream were lower about 8.6 times to a 1,531 times than those of other lakes and rivers in Korea. So, to preserve the water quality in Owon stream we have to manage continuously on the nitrogen and phosphorus.

저서동물을 이용한 진양호 유입하천의 수질평가

주현수,박종천,이원교 國立 麗水大學校 環境問題硏究所 1999 環境硏究論文集 Vol.2 No.-

This study was conducted to evaluate the biological water quality by aquatic benthos community analysis in the upper stream of Lake Jinyang of Kyungsangnamdo province. The total of benthic animal during surveyed period was indentified in all sites 31 species, 31 genera, 27 famillies 15 orders 7class in 4 phylums; In phylum platyhelmites 1 species, 1genus 1 family 1 order 3 class , in annelida 3 species 3 genera, 3 famillies 3 orders 2 class, in mollesca, 4 species, 4 genera, 3 famillies 3 orders 2 class, and in arthropoda 29 species, 24 genera, 20 famillies 8 orders 2 class were recorded. According to the analysis of biological indices of dominance index(DI), water quality of majority was either ? -mesosaprobic or polysaprobic but site 1 and 4 were polysaprobic at all seasons. In case of diversity index(H'). however, water quality in all sites were polysaprobic.

조류생산잠재력에 의한 진양호의 생물학적 수질평가

주현수,김진,박종천,정원석,이원교,이우범 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-

On filtrated and autoclaved water samples from Lake Jinyang, algal growth potential(AGP) test using Selenastrum capricornutum Printz were performed from February, 1999 to October, 1999 in order to assess fertility potential of the lake and to identify possible limiting nutrients. Algal growth potentials of the filtrated and filtrated after autoclaved samples were 0.018 ㎎/ℓ ~9.965 ㎎/ℓ and 0.018 ㎎/ℓ ~28.788㎎/ℓ respectively during surveyed period. AGP of the filtrated after autoclaved were higher than those of the filtrated only except some specific stations. The points of maximum growth were measured after addition of N, P and unenriched samples (control). The limiting factor was nitrogen only at site 5 in spring and phosphate appeared to be the major limiting nutrients in spike test throughout the year, especially during spring and autumn. Accoding to trophic level by Sudo(1980), the water quality of lake Jinyang were estimated mesotrophic at site 2, 4, 5, 6 in spring, at site 3, 6 in summer and at site 6 in autumn but all other sites were oligotrophic. But it is suggested that if we have not manigement of lake Jinyang, the water quality is possible to convert eutrophic.

이동통신 멀티미디어 데이터서비스의 트래픽 특성 모델링 및 성능분석

정용주,백천현,김후곤,최택진,양원석,황흥석 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2

The aim of this study is to identify the data traffic capacity of 3G mobile communication networks, especially of cdma2000-1X networks. Three-layered ON/OFF traffic model is used to describe the dynamics of data traffics and the process of data transmission such as packet scheduling. We construct a simulator fully incorporating packet handling process of cdma2000-1X data network as well as three-layered ON/OFF traffic model describing the behavior of source data traffics. To get influence of traffic parameters on performance measures, the extensive simulations were performed for several data sets which are obtained from real trace data or previous studies. The experimental results show that the engineered throughput satisfying QoS criteria is approximately 20% of total capacity. Finally, some proposals to improve the system capacity are followed.

강진만에서 미생물의 년 변화

박종천,오재영,정용욱,주현수,이원교,유춘만,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

The biological surveys were performed at seven sites in the Gangjin bay from February, 1998 to November, 2001. In order to analysis of environmental variation, numbers of heterotrophic bacteria, general fungus and fecal coliforms were enumerated in each sample. The result showed that variation range of heterotrophic bacteria, general fungus, and fecal coliforms were 2.9 x 10^(3)~9.6 x 10^(3) CFU/ml, 17.2~80.1 CFU/ml, and 6.3~682.5 CFU/100ml for four tears(1988~2001), respectively. Density of heterotrophic bacteria and general fungus were gradually decreased for four tours, while fecal coliforms were suddenly increased. Specially, numbers of fecal colifoms were increased the more 100 times in 2001 than that 1998. We think that it was probably caused a little rainfall in February, 2001. There result suggests that ecosystem of Gangjin bay were mainly regulated by 2~3 factors, which were inflow of fresh water, salinity and variation of water temperature.

기능상실한 이식신의 절제

조원현,남창우,김천일,주일,박성배,김현철 大韓移植學會 1994 Korean Journal of Transplantation Vol.8 No.1

압축공기를 이용한 건식 선삭가공의 절삭특성

송춘삼,김주현 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.1

The purposes of using cutting fluid during cutting have been cooling, lubricating, chip washing, and anti-corroding. However, the present manufacturing industry restricts the use of cutting fluid because cutting fluid contains poisonous substances which are harmful to the human body. Therefore dry cutting becomes an unavoidable assignment, and a lot of researches have studied cutting methods without using cutting fluid. Because dry turning is a continuous work, tools life is reduced by continuous heat generation and surface gets rough due to reduced lubrication, so it is important to consider these situations. In this paper, the way of selecting the optimal machining condition by the minimum number of experiments and the effectiveness of using compressed air in high hardness materials through Taguchi method have been found. Dry cutting using compressed air showed better cutting characteristics than normal dry cutting with respect to by cutting force, tool wear, and surface roughness. Also, the optimal machining condition for dry cutting using compressed air could be selected through Taguchi method.

수술실 오염도감소를 위한 수술실공조시스템에 대한 연구

김천숙,박은정,강규식,김지은,안기량,권진형,유시현,주영철,권순정 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1

Background: The OR(operating room) should provide an optimum environment that is safe for the patient and the working personnel. The air ventilation system of OR has been studied to decrease the contamination of air. We investigated the flow and contamination of the air in OR at our hospital. Method: Cultures in OR were made and the number of bacteria and fungi were calculated. A two-dimensional model for the cross-section of an operation room is developed for the CFD (computational fluid dynamics) analysis. The characteristics of air flow in the empty operation room and in the occupied operation room are calculated by using a CFD program. Results: The current air ventilation system of our hospital does not deliver the clean air to the operating site efficiently in occupied OR. Conclusions: We suggested a new location of air ventilation system which improves air venting with little increase of the cost of equipment.

GC와 GC-MS에 의한 어란의 지방산 분석

이주현,전명숙,이명환 서울여자대학교 자연과학연구소 1995 자연과학연구논문집 Vol.6 No.-

9종류의 어란에서 지방산을 추출하여 GC-MS로 분석한 결과 다음과 같은 결과를 얻었다. 1. 어란중 지방산을 GC와 GC-MS로 분석할 때 초기온도를 60°C로 하고 승온률을 9°C/min, 마지막 온도를 220°C로 하는 승온법이 목적 성분을 분리하는데 가장 좋은 결과를 얻었다. 2. 가자미, 날치, 대구, 명란, 농어, 성어, 오징어, 참치, 청어의 알에서 지방산을 추출하여 GC로 분석한 결과 포화 지방산은 myristic acid, palmitic acid, stearic acid, arachidic acid가 검출 되었고, 불포화 지방산은 oleic acid, linolenic acid 가 각각 확인 되었다. 3. 포화 지방산은 myristic acid가 명태알에 11.8㎍/g 으로 가장 많이 함유되어 있었고, palmitic acid는 오징어알에서 106.32㎍/g으로 가장 많이 함유되어 있었다. Stearic acid는 농어알에 53.03㎍/g, arachidic acid는 대구알에 8.5㎍/g으로 가장 많은 양이 함유되어 있었다. 4. 불포화 지방산인 oleic acid와 linolenic acid의 함량을 분석한 결과 oleic acid는 가자미 알에 linolenic acid는 명태알에 각각 109.12㎍/g, 62.48㎍/g으로 가장 많은 양이 함유되어 있었다. Fatty acids were extracted from the roe of flounder, flying fish, Pacific cod, Alaska Pollack, mero, shark, squid, tuna, and herring. They were methylated and analyzed by GC and GC-MS. Most of fatty acids found from 9 different roe were myristic acid, palmitic acid, stearic acid, arachidic acid, oleic acid, and linolenic acid. The roe of Alaska Pollack, squid, mero, and Pacific cod contained 11.8ug/g, 62.48 ug/g, of unsaturated fatty acids such as oleic acid and linolenic acid, respectively. The roe of flounder and shark had higher content unsaturated fatty acids than rest of the roe. The roe of Pacific cod, Alaska Pollack, mero, squid, tuna, and herring had larger amount of saturated fatty acids than the rest of the roe.

수목장(樹木葬)의 특성에 관한 고찰

서주환,최현상,정해천,승지현 경희대학교 디자인연구원 2005 예술· 디자인학연구 Vol.8 No.2

To secure a space for graveyard in a funeral has become one of the new issues in Korea. This caused the problems of graveyard shortage, destruction of national landscape, inroad of territory, and ecological environment. However, In eco-friendly method of funeral, the Woody Plant Funeral is a new form of Funeral to bury the ashes of the deceased under the wood so it participate with eternal life in wood and forest by provision of nature(wood and people return to nature to be born in nature). The purpose of this paper is to explain one of the counterplan which the Woody Plant Funeral solve graveyards problem.