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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.
강주성, 박동원, 안성옥, 김수균 배재대학교 공학연구소 2013 공학논문집 Vol.15 No.1
Using features in the Java Applet game is played on the screen, and web production. Linked using Applet to Database, and will save the record. It also makes the stored data with Statistics screen. What is the problem with him, looking to find ways to solve. For alternative methods are discussed.
SUS 304鋼의 크리이프溫度領域에 관한 時間依存型 및 싸이클依存型 疲勞크랙 傳播
周原植 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.1
The low-cycle fatigue creak growth behavior of SUS 304 Stainless steel was investigated at 650℃ by the nonlinear fracture mechanics. Crack Propagation can be separated into cycle-dependent and time-dependent, the former is correlated with △J_(f), J-intergral range and the latter is correlated with J', modified J integral. Transition from cycle-dependent to time-dependent crack growth was successfully predicted using the β hypothesis, which was proposed by the authors on the basis of an analysis on the interaction of elastic and creep strain. To investigate the reliability of β-hypothesis, experimenting by the change of stress-level, stress rate and frequency, following conclusions were obtained. 1) High temperature fatigue crack propagation was separated into cycle-dependent and time-dependent. 2) Transition of crack propagation was predicted by △J_(c)/△J_(f) or β. 3) Lower limit in cycle-dependent crack propagation was obtained.
朱寬植,鄭元謨 明知大學校 自然科學硏究所 1984 자연과학논문집 Vol.2 No.-
?Gd의 몇몇 감마전이에 대한 혼합비 δ를 구하기 위하여 감마-감마 각 상관관계 실험을 하였다. 두개의 Single Channel Analyzer 와 세개의 Counter, 그리고 하나의 Univeral Coincidence 를 사용한 동시회로가 본 실험에 사용되었다. 각 상관계수 Akk를 구하기 위하여, 각도 90?, 120?, 150?180?에서 동시계열(1596-123 keV, 1274-123keV,1005-123keV,873-123keV,248-123keV,723-873keV)을 조사하였다. δ(1596)=-0.091?, δ(1274)=-0.0009? δ(1005)= 6.3?, δ(873) =-5.9?, δ(248)= 0.295?를 구하였다. Gama-gamma angular correlation measurements were perormed to determine the mixing ratio δof some γ-transistions in ?Gd. The coincidence circuit with two single channel analyzer, three counters and a universal coincidence were used to this experiment. To get the angular correlation coefficient Akk, the angular correlation function W(Θ) was fitted to the coincidence sequences at the angular positions Θ=90?, 120?150?and 180?. Results for themixing ratios are: δ(1596)=-0.091+0.049-0.052, δ(1274)=-0.009+0.016-0.034, δ(1005)=6.3+4.5-1.8, δ(873)=-5.9+2.5-1.8, δ(248)=0.295+0.070-1.134
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.
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.
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.