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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.
高溫低싸이클 疲勞크랙전파에 미치는 過度的 크리이프變形擧動의 影響
周原植,韓根祚 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
Considering the elastic strain and the creep strain at high temperature low cycle fatigue, together, we could find that the experimental modified J integral, J'ex is larger than the theoretical value, J'a. To investigate which effects this enlargement have on the crack propagation in the creep-fatigue interaction range, the high temperature low cycle fatigue crack experiment was accomplished using CN specimens. The results are as follows. 1. The enlargement of J'ex is not considerable at R=0 but at R=-1 it is considerable. 2. J'ex with low stress holding time is 2-10 times larger than the one without holding time. 3. In case of no holding time, the enlargement of J'ex has effects on the crack crack propagation rate at R=-1, but at R=0 a certain factor having no effects was found out.
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.
SA 508c-3강의 고온에서 J-R 및 Tmat의 평가
주원식,임만배 東亞大學校 1998 東亞論叢 Vol.35 No.-
In this study, the J-Resistance Curve and material tearing modulus of SA508-C3 steel, which is one of the used nuclear pressure vessel steel, were measured at room temperature, 200℃ and 300℃ according to load ratio analysis and ASTM E813. ASTM E1152, respectively. It was observed that J-R curve and Tmat value decreased as the temperature level invreased. Applicability of Tj proposed by Paris et al as an instability paramter for ductile material is investigated. The results are the Tj parameter may be used as a crack instability parameter.
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.
SUS 304강의 크리이프 온도역에 있어서 피로균열성장거동에 관한 연구
주원식,조석수 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
The high temperature fatigue crack growth behavior of Type SUS 304 stainless steel at 550℃ and 650℃ was investigated under various kinds of stress ratios and frequencies in sinusoidal waveform. The result arranging crack growth rate by modified J-integral J' showed influence of stress ratio and frequency. All the data obtained under the test at 550℃ were plotted within data band of da/dN-△J_(f) relationship. Both the time and the cycle dependent crack growth behavior were observed under loading conditions at 650℃, but the cycle dependent crack growth behavior predominantly appeared and the time dependent crack growth behavior was little observed under loading conditions at 550℃. Fractographic examinations for fracture surface indicated that the fracture mode was generally transgranular. The J'_(an) had a validity in case of 650℃, but had scarcely it in case of 550℃
주현수,김진,이원교,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-
A survey of phytoplankton community was carried out seasonally from January to September, 2000 at Seomjin river, Jeollanamdo, Korea. The author have examined 158 taxa of the phytoplankton from researched area. These were composed of 6 classes, 14 orders, 33 families, 75 genera, 145 species, and 13 varieties. The composition of occurrence species were as follows: green algae are 42.4%, diatoms are 39.2%, blue green algae are 12.0% and etx(6.4%). Dominant species were Scenedesmus dimorphus, Melosira varians, M,granulata, Fragilaria constuns, Asterionella grasillima, Synedra ulna, Synedra acus, Cymbella affinis, Nitzschia sigma, N.seriata, frustual. The standing crops varied from 2.304 cell/ℓ to 13.056 cells/ℓ in winter and spring, and appeared from 234 cells/ℓ to 6784cell/ℓ in summer and autumn. It was different than general dimictic lake in temperate zone has seasonal change of standing crop. Phytoplankton density of Seomjin river were lower about ten times to a five thousand tines than those of other lakes and river in Korea. So, to preserve the water quality in Seonjin river we have to manage continuously on the nitrogen and phosphorus.