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신원상(Shin, Won-Sang),이강민(Lee, Kang-Min),손창백(Son, Chang-Baek) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.8
This study is aimed at offering basic data for enhancing the organizational structure and productivity of on-site construction management (CM) employees. To accomplish the objective, the organizational operation system and employee evaluation of domestic CM companies were analyzed by site scale to promote efficient operation. The findings are as follows. First, in terms of CM workforce, the employees handling architecture, electricity, and machines represented the highest proportion. As for qualification, top engineers were dispatched to both large-scale and small-scale CM sites more than any other employee. Second, the results on CM organizational productivity are as follows. The per capita sales increased as the service payment increased. In terms of scale, the site worth less than a billion won had per capita sales of 76 million won, about 5 times less than the site worth 5 billion won or more whose per capita sales were 371 million won. The monthly per capita sales also increased as the service payment increased. However, the difference was minimal, about a half of the difference in per capita sales. These findings would be useful for companies that have no systematic criteria for CM organization selection and evaluation.
김현주(Hyun-Joo Kim),이병원(Byong Won Lee),백기호(Ki Ho Baek),조철훈(Cheorun Jo),김재경(Jae-Kyung Kim),이진영(Jin Young Lee),이유영(Yu-Young Lee),김민영(Min Young Kim),김미향(Mi Hyang Kim),이병규(Byoungkyu Lee) 한국식품과학회 2020 한국식품과학회지 Vol.52 No.5
쌀국수의 유통 안전성 확보를 위한 기초자료를 확보하기 위하여 최근 각광받고 있는 저온 플라즈마 처리에 의한 쌀국수의 품질 특성 분석을 하였다. 본 연구에서 이용한 플라즈마는 컨테이너형 유전격벽 플라즈마로 방전 가스는 공기를 활용하여 0, 5, 10 및 20분 처리하였고 미생물 감균효과, 색도, 경도 및 지질산패도 변화를 측정하였다. 쌀국수에 B. cereus 및 E. coli O157:H7을 접종한 후 20분간 플라즈마 처리 시 E. coli O157:H7은 2.75 log CFU/g 감소하였고, B. cereus는 검출되지 않았다. 색도 측정결과 플라즈마 처리에 의해 명도(L<SUP>*</SUP>), 적색도(a<SUP>*</SUP>) 및 황색도(b<SUP>*</SUP>) 모두 증가하였으며, 경도는 처리시간이 증가함에 따라 감소하는 경향을 보였다. 하지만 플라즈마 처리에 의해 지질산화가 일어나는 경향을 보였다. 따라서 공기로 방전된 저온 플라즈마 기술은 쌀국수의 품질안전성을 개선될 것이라고 판단되나 관능적 품질 특성 개선을 위한 적합 플라즈마 모델 선정, 포장방법 개선 등의 후속연구가 필요하다고 판단된다. Cold plasma has been applied to improve quality of food product; however, studies on its effects on microbial and physicochemical qualities of rice noodles are rarely conducted. In this study, changes in the quality characteristics of rice noodles treated by cold plasma were determined. Cold plasma was generated in a square-shaped plastic container (250 W, 15 kHz, ambient air), and dielectric barrier discharge plasma treatments were applied to rice noodle samples for 0, 10, or 20 min. Rice noodles inoculated with either Bacillus cereus or Escherichia coli O157:H7 were subjected to plasma treatment for 20 min, and the approximate bacterial count reduction were 4.10 and 2.75 log CFU/g, respectively. The Hunter color values of the sample were increased after cold plasma treatment. Peroxide values and thiobarbituric acid reactive substance (TBARS) were increased with an increase in cold plasma treatment time. Futhermore, lipid oxidation was enhanced. Although further studies are warranted to evaluate changes in chemical qualities, such as lipid oxidation of rice noodles, induced by cold plasma, the results suggest that cold plasma can improve the microbial and physical qualities of rice noodles.
Lim, Sang-Soon,Kim, Ju-Heon,Kwon, Beomjin,Kim, Seong Keun,Park, Hyung-Ho,Lee, Ki-Suk,Baik, Jeong Min,Choi, Won Jun,Kim, Dong-Ik,Hyun, Dow-Bin,Kim, Jin-Sang,Baek, Seung-Hyub Elsevier 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.678 No.-
<P><B>Abstract</B></P> <P>As a field-assisted technique, spark plasma sintering (SPS) enables densification of specimens in a very short period of time compared to other sintering techniques. For high performance thermoelectric material synthesis, SPS is widely used to fabricate nanograin-structured thermoelectric materials by rapidly densifying the nanopowders suppressing grain growth. However, the microstructural evolution behavior of thermoelectric materials by SPS, another important process during sintering, has been rarely studied. Here, we explore SPS as a tool to control the microstructure by long-time SPS. Using p-type (Bi<SUB>0.25</SUB>Sb<SUB>0.75</SUB>)<SUB>2</SUB>Te<SUB>3</SUB> thermoelectric materials as a model system, we systematically vary SPS temperature and time to understand the correlations between SPS conditions, microstructural evolution, and the thermoelectric properties. Our results show that the relatively low eutectic temperature (∼420 °C) and the existence of volatile tellurium (Te) are critical factors to determine both microstructure and thermoelectric property. In the liquid-phase sintering regime, rapid evaporation of Te leads to a strong dependence of thermoelectric property on SPS time. On the other hand, in the solid-phase sintering regime, there is a weak dependence on SPS time. The optimum thermoelectric figure-of-merit (Z) of 2.93 × 10<SUP>−3</SUP>/K is achieved by SPS at 500 °C for 30 min. Our results will provide an insight on the optimization of SPS conditions for materials containing volatile elements with low eutectic temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spark plasma sintering (SPS) is used to synthesize the thermoelectric (Bi<SUB>0.25</SUB>Sb<SUB>0.75</SUB>)<SUB>2</SUB>Te<SUB>3</SUB>. </LI> <LI> Liquid phase and volatile element are a key for the microstructure and thermoelectric property. </LI> <LI> Thermoelectric figure-of-merit of 2.9 × 10<SUP>−3</SUP>/K is achieved at 500 °C for 30 min. </LI> </UL> </P>
우황청심원 관련 최근 연구 동향 : 국내 논문에 대한 고찰
이제원,백경민,백영두,임은영,장우석,전우현,정인권,Lee, Je-Won,Baek, Kyung-Min,Baek, Young-Doo,Im, Eun-Young,Chang, Woo-Seok,Cheon, Woo-Hyun,Chung, In-Kwon 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.4
Objectives : Woohwangchungsim-won has been used for acute diseases such as cerebrovascular disease (stroke), heart disease. The aim of this study was to determine the effects, significance & necessity of Woohwangchungsim-won in acute stages of these disease by reviewing Korean articles about Woohwangchungsim-won. Methods : Article searches were performed on 8 major Korean web article search engine from January 1980 to August 2010. There were no restrictions on the types of publication, including grey articles. Results : Forty-three articles were included. Twenty one were efficacy tests, thirteen were comparative efficacy tests, eight were toxicity tests, and one was new method development. Eighteen articles were multicenter studies and twenty five were single center studies. Thirty two articles were animal testing, only ten articles were clinical articles. Thirty seven articles presented the composition and quantity of Woohwangchungsim-won, but six did not. Conclusions : The results of Korean articles about Woohwangchungsim-won can not strongly support the effects, significance & necessity of Woohwangchungsim-won. More rigorous studies are required for determination of the effects of Woohwangchungsim-won.
청소년의 지진방재 의식조사에 관한 연구 : 고등학생을 중심으로
Won-Hoi Koo,Ho-Joon Shin,Min-Ho Baek 한국재난정보학회 2013 한국재난정보학회 논문집 Vol.9 No.2
본 연구는 지진발생에 따른 국내·외 피해 및 학교시설의 피해사례를 분석하였다. 또한 많은 시간을 학교에서 생활하고 있는 고등학생을 대상으로 지진방재 의식조사를 실시하였다. 그 결과 대부분의 학생들이 지진에 대한 위험성은 알고 있으나, 대피방법 및 대피요령에 대한 세부적인 사항의 정보는 미숙하였다. 이러한 의식조사결과를 바탕으로 향후 교육시설의 지진방재대책을 마련하기위한 기초자료를 제시하였다.
Baek Seong-Uk,Kim Min-Seok,Lim Myeong-Hun,Kim Taeyeon,Yoon Jin-Ha,Won Jong-Uk 한국산업안전보건공단 산업안전보건연구원 2023 Safety and health at work Vol.14 No.4
Introduction: There is a growing global interest in the issue of precarious employment. We aimed to analyze the characteristics and socio-demographic distribution of precarious employment using a summative score approach. Methods: To operationalize precarious employment, we utilized data from the Korean Working Conditions Survey and focused on three distinct dimensions: employment insecurity, income inadequacy, and a lack of rights and protections. By constructing a summative scale ranging from -16 to 2, with lower scores indicating higher precariousness, we measured employment precariousness among Korean wage workers. To compare employment precariousness according to survey participant characteristics, we employed the Wilcoxon Rank Sum Test. Results: We analyzed a weighted number of 38,432 workers. The overall sample showed a median (Q1, Q3) summative scale score of -3 (-6, -1). The median summative score was lower for women compared to men (men: -2; women: -5; p < 0.001), as well as for young or older workers compared to middle-aged workers (young: -4; middle-aged: -2; older: -5; p < 0.001). Similarly, workers with lower educational levels (middle school or below: -8; high school: -5; college or above: -2; p < 0.001) and non-white collar workers (blue collar: -5; service/sales worker: -6; white collar: -2; p < 0.001) experienced higher levels of employment precariousness. Conclusion: Our findings indicate that certain vulnerable groups, such as women, young or older adults, workers with low educational attainment, and caregiving or low-skilled elementary workers, are disproportionately exposed to high employment precariousness. Active policy interventions are needed to improve the employment quality of vulnerable groups.
Methyltransferase and demethylase profiling studies during brown adipocyte differentiation
( Min Jeong Son ),( Won Kon Kim ),( Kyoung Jin Oh ),( Anna Park ),( Da Som Lee ),( Baek Soo Han ),( Sang Chul Lee ),( Kwang Hee Bae ) 생화학분자생물학회(구 한국생화학분자생물학회) 2016 BMB Reports Vol.49 No.7
energy balance, the molecular mechanism of brown adipocyte differentiation has not been extensively studied. Specifically, regulation factors at the level of protein modification are largely unknown. In this study, we examine the changes in the expression level of enzymes which are involved in protein lysine methylation during brown adipocyte differentiation. Several enzymes, in this case SUV420H2, PRDM9, MLL3 and JHDM1D, were found to be up-regulated. On the other hand, Set7/9 was significantly down-regulated. In the case of SUV420H2, the expression level increased sharply during brown adipocyte differentiation, whereas the expression of SUV420H2 was marginally enhanced during the white adipocyte differentiation. The knock-down of SUV420H2 caused the suppression of brown adipocyte differentiation, as compared to a scrambled control. These results suggest that SUV420H2, a methyltransferase, is involved in brown adipocyte differentiation, and that the methylation of protein lysine is important in brown adipocyte differentiation. [BMB Reports 2016; 49(7): 388-393]