• 한국강구조학회 논문집
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• 제10권4호통권37호
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• pp.629-639
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• 1998

본 연구에서는 반복재하 실물대 실험에 의해 철골 모멘트접합부(column-tree 형식)의 내진거동을 평가하였다. 시험체는 $H-600{\times}200$ (보) 및 $H-400{\times}400$ (기둥) 계열의 SS41 (SS400) 압연형강으로 제작되었으며 보에 대한 패널존의 상대강도를 실험의 주요변수로 고려하였다. 본 실험결과에 의할 때 패널존의 강도가 클수록 열등한 내진성능을 보였다. 시험체의 모멘트 접합부에서 접합부의 파괴 이전까지 발휘된 총소성회전각은 1.8 (% rad)에서 3 (% rad) 범위에 있었다. 시험체의 접합부는 보플랜지 열영향부의 파단 또는 기둥플랜지 두께방향의 뽑힘으로 인하여 파괴되었다. 비록 제한된 실험자료이긴 하나 본 연구의 결과는 보에만 항복을 유발하는 것 보다는 패널존의 항복도 허용하는 것이 접합부의 전체적 소성변형능력을 높이는데 유리할 것임을 시사한다. 이러한 실험결과를 역학적으로 설명할 수 있는 모델도 제시하고자 하였다.

• Mycobiology
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• 제49권1호
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• pp.86-88
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• 2021

The monokaryotic strain, Schizophyllum commune strain IUM1114-SS01, was generated from a basidiospore of dikaryotic parental strain IUM1114. It even showed the decolorizing activities for several textile dyes much better than its parental strain. Based on the results of a single-molecule real-time sequencing technology, we present the draft genome of S. commune IUM1114-SS01, comprising 41.1 Mb with GC contents of the genome were 57.44%. Among 13,380 protein-coding genes, 534 genes are carbon hydrate-active enzyme coding genes.

• 한국농공학회논문집
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• 제57권5호
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• pp.129-137
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• 2015

The objective of this study was to test the non-point source pollution (NPS) control by the vegetated ridge and silt fence through field monitoring. The experiment plots were established with three sizes which are 5 m width by 22 m length with 8 %, 3 % slope and 15m width by 15 m length with 6 % slope. Flumes with the floating type stage gages were installed at the outlet of each plot to monitor the runoff. For a rainfall monitoring, tipping bucket rain gage was installed within the experiment site. Water quality samples were monitored during the heavy rainfall occurred. The amount of rainfall from 4 monitored events ranged from 27.6 mm to 130 mm. The runoff reduction rate could vary depending on slope, soil, crop growth condition, rainfall amount, rainfall intensity, antecedent moisture condition, and many other factors. The runoff from vegetated ridge and silt fence treatment plots was 24.05 % and -8.28 % lower than that from control plot, respectively. The monitoring results showed that the average pollution loads reduced by vegetated ridge compared to control were BOD 36.62~53.60 %, SS 40.41~73.71 %, COD 39.34~56.41 %, DOC 49.08~53.67 %, TN 26.74~67.23 %, and TP 52.72~91.80 %; by silt fence compared to control were SS 41.73 %, COD 1.93 %, and TN 2.38 %. The paired t-test result indicated that the vegetated ridge and silt fence were statistically significant effect in SS load reduction, with a 5 % significant level. Monitored results indicated that vegetated ridge and silt fence were both effective to reduce the pollutant from the field surface runoff.

• 수산해양기술연구
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• 제21권2호
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• pp.151-156
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• 1985

본 연구에서는 양쪽크랙 인장시험편을 이용한 평면응력 파괴인성치 J 하(1C)를 검토하기 위하여, 두께 4.5mm 일반구조용 압연강판(SS41)을 균질화 및 연화처리하고 각각의 경우에 대하여 크랙비가 0.55, 0.65, 0.75인 시험편을 준비하여 J 하(1C) 및 저항곡선의 거동을 고찰하였다. 얻어진 결과를 요약하면 다음과 같다. 1) 양쪽 크랙 인장시험편을 사용하여 J 하(1C)를 구한 값은 한계하중에 의한 방법이 Rice가 제안한 방법보다 크게 나타남을 알 수 있다. 2) Rice가 제안한 방법으로 J 하(1C)는 실험한 크랙비 범위 0.55-0.75에서 거의 일정한 값을 나타내고 저항곡선의 기울기는 크랙비에 따라 증가하였다. 3) Rice가 제안한 방법으로 [SS41의 J 하(1C)의 평균값은 모재는 22.8kgf/mm, 균질화 처리재는 24.7kgf/mm, 연화처리재는 26.9kgf/mm를 얻었다

• 한국관개배수논문집
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• 제21권1호
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• pp.55-63
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• 2014

A sedimentation basin for agricultural water quality improvement was researched to analyze the water quality purification characteristics. The sedimentation basin constructed at the inlet of Gamdon reservoir in Muan-gun, Jeollanam-do was selected as the research field of this study. The surface area of the sedimentation basin is $34,000m^2$, volume is $122,000m^3$, and hydraulic retention time is 0.3hr~7.3day. The average influent loading of SS was 156.6kg-SS/d, and the effluent loading was 67.5kg-SS/d with the average removal rate of 56.9%. The average influent loadings of BOD and COD were 33.0kg-BOD/d and 60.3kg-COD/d respectively, and the effluent loadings were 26.4kg-BOD/d and 48.6kg-COD/d with the average removal rate of 20.1% and 19.3% respectively. Therefore, the results of this study show that a sedimentation basin can purify SS and organic matters. The average influent loadings of T-N and T-P were 28.7kg-TN/d and 2.97kg-TP/d respectively, and the effluent loadings were 16.3kg-TN/d and 1.41kg-TP/d with the average removal rate of 43.0% and 52.6% respectively. In conclusion, the overall results of this study show that a sedimentation basin is a feasible alternative to purify organic matters and nutrients.

• 한국수자원학회논문집
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• 제41권12호
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• pp.1187-1198
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• 2008

국내 많은 저수지들과 그 하류하천은 높은 탁도를 가진 물의 장기적인 방류로 인해 수자원 이용과 수생태계 관리에 많은 어려움을 겪고 있다. 탁도($C_T$)는 물의 탁한 정도를 나타내는 척도로써, 수질과 수환경의 건강을 평가하는 매우 중요한 지표로써 광범위하게 사용되어 왔지만, 모형의 검증에 필요한 실험 자료의 부족으로 인해 탁도 모델링에 대한 연구는 지금까지 매우 부족하였다. 본 연구의 목적은 광범위한 현장 실측자료를 이용하여 성층화된 대청호로 유입한 탁수의 밀도류 거동 모의를 위한 3차원 수리-입자동력학 연동 수치모형인 ELCOM-CAEDYM의 적용성을 검증하는데 있다. 입자크기에 따라 구분된 3개 그룹의 부유물질 (SS) 농도가 모형의 모의변수로 사용되었으며, 모형 변수인 SS와 저수지내 실측값의 $C_T$의 변환을 위해 저수지 지점별로 측정한 SS-$C_T$ 상관관계를 사용하였다. 모의결과는 2004년에 대청호의 회남과 댐앞 지점에서 수심별로 실측한 수온과 탁도 자료와 비교함으로써 검증하였다. 모형은 저수지의 성층구조, 탁수를 포함한 하천 밀도류의 시간에 따른 진행과정을 잘 재현하였으며, 탁도의 수직분포와 크기도 실측값과 부합하였다. 본 연구에서 제시한 3차원 수치모형과 탁도 모델링 방법론은 유사한 탁도 문제를 가지고 있는 다른 저수지에서도 탁수의 최적관리를 위한 지원 도구로써 사용 가능하다고 사료된다.

• 대한환경공학회지
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• 제36권10호
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• pp.685-690
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• 2014

하수처리시설 초과유량에 대한 처리 규제 입법 예고로 인해 강우 월류수 처리에 대한 관심이 증가하고 있다. 본 연구에서는 강우 월류수 염소(차아염소산나트륨) 소독 시 소독제 농도(0.11-4.0 mg $Cl_2/L$), pH (6.5-8.0), 온도($15-25^{\circ}C$), 암모니아 농도(10-41 mg N/L), 부유물질(91-271 mg SS/L)이 대장균군수 감소 속도에 미치는 영향을 고찰하였다. 차아염소산나트륨 농도 효과는 반속도 상수가 1.212mg $Cl_2/L$인 saturation-type model로 잘 모사되었다. 소독 반응 속도는 SS와 pH 증가에 따라 감소되는 반면, 온도에 따라서는 증가하였고, 암모니아 농도에는 영향을 받지 않았다. 월류수 유입 조건을 $1{\times}10^5MPN/mL$, 271 mg SS/L, $15^{\circ}C$, pH 8.0로 가정할 때, 염소 주입 농도 1 mg/L, 수리학적 체류시간 1.25 분인 염소 소독조를 통해 입법예고 된 수질 기준의 1/3 수준인 대장균군수 1,000개/mL를 달성할 수 있을 것으로 계산되어, 염소 소독이 강우 월류수 소독에 유효하게 사용될 수 있을 것으로 판단된다.

• Nutrition Research and Practice
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• 제15권2호
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• pp.187-202
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• 2021

BACKGROUND/OBJECTIVES: The exposure to sucrose in rats has mimic abnormalities attributed to metabolic syndrome (MetS). The effects of honey bee and "free" glucose and fructose, have not been explored in this context. The aim was to expose Wistar rodents to sucrose solution (SS), honey solution (HS) and fructose/glucose solution (GFS) at 30% to assess their effects. SUBJECTS/METHODS: HS (n = 10), SS (n = 10) and GFS (n = 10) groups were formed. Solutions were ad libitum along 14-weeks. RESULTS: Between solutions consumptions, honey was significantly 42% higher (P = 0.000), while similar consumption was observed among GFS and SS. The feeding pattern of HS consumption was irregular along experiment; while the food intake pattern showed the similar trend among groups along time. Non statistical differences were obtained in any biochemical and anthropometric measure, however, a higher concentration of leptin (721 ± 507 pg/mL), lower concentration of total cholesterol (TC; 48.87 ± 2.41 mg/100 mL), very low density lipoprotein (VLDL; 16.47 ± 6.55 mg/100 mL) and triglycerides (82.37 ± 32.77 mg/100 mL) was obtained in SS group. For anthropometric values, HS showed less total adipose tissue (AT; average 26 vs. 31-33 g) and adiposity index (average 6.11 vs. 7.6). Due to sugar-sweetened beverages consumption increases the risk for the development of chronic diseases; correlations between fluid intake and anthropometric and biochemical parameters were assessed. A moderate correlation was obtained in groups with the weight of total AT and solution intake; for the weight gain in GFS group and for triglycerides in HS and GFS. The highest hepatic tissue damage was observed in SS group with multiple intracytoplasmic vacuoles, atypia changes, moderate pleomorphism and hepatocellular necrosis. CONCLUSIONS: In spite of the significantly higher consumption of HS, biochemical, anthropometrical and histological effects were not remarkably different in comparision to other sweeteners.

• Nuclear Engineering and Technology
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• 제41권2호
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• pp.149-154
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• 2009

The microstructure, the corrosion behavior and the oxide properties were examined for Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr (HANA-4) alloys which were subjected to two different final annealing temperatures: $470^{\circ}C$ and $570^{\circ}C$. HANA-4 was shown to have $\ss$-enriched phase with a bcc crystal structure and Zr(Nb,Fe,Cr)$_2$ with a hcp crystal structure with $\ss$-enriched phase being more frequently observed compared with Zr(Nb,Fe,Cr)$_2$. The corrosion rate of HANA-4 was increased with an increase of the final annealing temperature in the PWR-simulating loop, $360^{\circ}C$ pure water and $400^{\circ}C$ steam conditions, which was correlated well with a reduction in the size of the columnar grains in the oxide/metal interface region. The oxide growth rate of HANA-4 was considerably affected by the alloy microstructure determined by the final annealing temperature.

• 한국정밀공학회지
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• 제29권10호
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• pp.1078-1088
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• 2012

In this paper, we present research experimental results about the different thickness T-joint welding of the high power continuous wave(CW) Nd:YAG laser for the secondary battery of a vehicle. Although the conventional method used for the secondary battery is a argon TIG welding, we utilize a laser welding to improve Tungsten Inert Gas(TIG) welding's weakness. The laser, which has a couple of advantage such as aspect ratio, low Heat Affected Zone(HAZ), good welding quality and fast productivity utilized in this work is a CW Nd:YAG laser. In order to observe laser welding sections, we used a optical microscope. Through the analysis of the metallographic, hardness, aspect ratio, and heat input, we obtained the desired data in condition of 1800 W laser beam power and 1.8 m/min and 2.0 m/min laser beam travel speeds. In order to compare electric resistances of the argon TIG welding and laser welding, we made an actual battery and the electric resistance of the laser welding is reduced by 40~45% comparing with the argon TIG welding.