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교대제형태에 따른 지하철 남성 근로자들의 수면의 질과 관련요인
김민기,이원철,이영민,유재홍,김환철,유승원,남경한 大韓産業醫學會 2008 대한직업환경의학회지 Vol.20 No.4
배경 교번제 근무에 의해 지하철 근로자들의 수면의 질은 영향을 받고 있으나 기존 연구자체가 교번제를 행하는 지하철 기관사들만을 대상으로 하여 3교대 근로자 및 비교대 근무자의 수면의 질 점수와 수면장애군 분포의 차이를 비교할 수 없었고 수면에 영향을 끼치는 요인들을 파악할 수 없었다 이에 본 연구는 교번제와 3교대제 및 비 교대제 근로자들 간에 수면의 질의 차이가 있는지와 영향을 끼치는 요인들에 어떤 것들이 있는 지를 분석하기 위해 본 연구를 수행하였다 방법 2007년도 5월 초에 일개 지하철공사에 근무하는 모든 근로자를 대상으로 구조화된 설문지를 배포하였으며 2007년 5월말까지 회수되었다 회수된 설문지 중 수면의 질 평가설문지를 완벽히 기재하지 않은 70(6.93%)명과 그 수가 많지 않은 여성 근로자 36(3.56%)명을 제외한 759(75.15%)명의 남성 지하철근로자를 대상으로 설문분석을 시행하였다 자기기입식 설문지를 통하여 얻어진 자료를 SPSS (ver 12.0)프로그램을 사용하여 분석하였다 결과 교번제 근로자들이 직무요구와 직무불안정을 제외한 모든 직무스트레스점수 영역에서 가장 높은 점수를 차지하고 있으며 한국형직무스트레스 중앙값과의 비교에서도 교번제 근로자 중에서 직무스트레스 하부항목의 평균값 이상의 비율이 높았다 비교대 근무근로자들은 직무요구 직무불안정 항목에서 가장 높은 점수를 나타내었다 교대제에 따른 수면의 질 점수에서도 교번제 근로자들의 평균값이 5.1로 수면의 질 증상 점수인 5점을 넘고 있었으며 교대제에 따라 수면의 질 점수와 증상분포에 차이를 보였다 수면의 질은 직무요구가 높고 외적통제 신념이 강할수록 지난 1년간 아차사고를 경험하였거나 업무 중 사고를 경험하였을 때 나빠지며 비교대제 이거나 내적통제신념이 강할수록 좋아지는 결과를 보였다 결론 교번제에서 수면의 질 평균점수가 가장 높고 증상군의 비율도 가장 높았으며 직무스트레스의 대다수 항목에서 가장 높았다 지하철근로자들의 수면의 질 향상을 위해서는 교번제를 가급적 줄이는 교대제 체계의 개선 및 직무요구의 적절한 분배 내적통제신념 등의 향상과 사고 및 아차사고에 노출되는 교번제와 3교대 근로자들을 위한 사고 예방교육이 도움이 될 수 있을 것이다 Background The sleep quality of subway drivers who work in the dark underground with an rotating shift system is generally poor, which can degrade the quality of a worker's life This study examined the relationship between the sleep quality of subway worker and shift work by comparing three shift systems (rotating shift system, a three day shift system and no shift system). Method Questionnaires including The short form of the Korean Occupational Stress Scale (KOSS) Pittsburgh Sleep Questionnaire (PSQI), the worker's age gender job type, accident, near miss and shift system were given to a total of 1010 workers The results of 759 qualified questionnaires (75.15 %) were analyzed using the SPSS (ver 12.0) program. Result The highest level of job stress was found among those working a rotating shift system followed by three shift system and no-shift system. The mean sleep quality score in the rotating shift workers was 5.1 (SD±3.2), which was greater than the sleep symptom score (5) 34.8% of rotating shift workers suffered from sleep symptoms. The sleep quality score by shift-work was significantly different High job demand, strong external locus control, the experience of a near miss or an accident in the workplace during previous year has an adverse affect on the sleep quality The sleep quality improved in case of a change into a no-shift system or a strong internal locus control. Conclusion A rotating shift system is more harmful to the quality of sleep in subway workers than a 3 shift system or no-shift system. In addition, job stress, personality, near miss and the experience of an accident affect the sleep quality of subway workers.
Shabina Yeasmin,Chul-Hawn Kim,J-Y Lee,M. I. Sheikh,H-J Park,S-H Kim,G-C Kim,J-W Kim 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
The experiment was conducted to evaluate the different NaOH pretreatment concentrations (0.25%, 0.50%, 0.75%, and 1.00%) on enzymatic saccharification (with cellulase, and β-glucosidase) and fermentation (by Saccharomyces cerevisiaeKCCM 11304) for bioethanol production from rice straw and rice husk. Pretreatment of rice straw and rice husk were conducted under both natural and powder state to observe the potentiality of the biomass condition (natural and powder state). In this study, glucose and ethanol production were increased with the increase of NaOH percentage for both rice straw and rice husk (natural and powder state). For rice straw, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.81 g g?¹ in a natural, and 0.63 g g?¹ in a powder state pretreatment). Similarly, for rice husk, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.47 g g?¹ in a natural, and 0.46 g g?¹ lin a powder state pretreatment). However, 0.75% NaOH pretreatment resulted in glucose yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). On the other hand, for rice straw, the highest amount of ethanol was obtained in 1.00% NaOH pretreatment (0.36 g g?¹ in a natural, and 0.31 g g?¹ in a powder state pretreatment). In addition, for rice husk, the highest amount of ethanol was also obtained in 1.00% NaOH pretreatment (0.24 g g?¹ in a natural, and 0.23 g g?¹ in a powder state pretreatment). Moreover, 0.75% NaOH pretreatment resulted in ethanol yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). It was confirmed that higher amount of NaOH use is cost effective. Moreover, higher amount of glucose and ethanol was observed when powder was prepared after pretreatment. So 0.75% NaOH pretreatment in a natural state is supposed to be suitable for enzymatic saccharification and fermentation for bioethanol production.
Conversion of bioethanol from old paper money bill by separate hydrolysisand fermentation
Shabina Yeasmin,Chul-Hawn Kim,Mominul Islam Sheikh,Hyun-Jin Park,Sung-Ho Kim,Jee-Young Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Paper money billis believed to be one of the mostpromising feedstock for near-term commercial application oftechnology for converting cellulosic raw materials intocommodity products. In this study, we conducted saccharification of waste papermoney using cellulase and β-glucosidase enzyme. Finally, we carried fermentation of paper money glucose by Saccharomyces cerevisiae KCCM 11304. By the separate hydrolysis and fermentation, we got 0.65 ㎎/g ethanol. Paper money can be used for simultaneous saccharification and fermentation.
Mominul Islam Sheikh,Chul-Hawn Kim,Shabina Yeasmin,Hyun-Jin Park,Sung-Ho Kim,Jee-Young Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Increased acceptance of climate change iscreated by human activities and raising oil demand with insecure deliverance obliges the searching for alternative fuels. Therefore, in recent years biofuel has emerged as mostimportant alternative resource for liquid fuel and has generated a great deal of research interestin biofuel fermentation.This paper reports a preliminary study on the chemical pretreatment, microbial saccharification and fermentation of the agricultural leftovers like rice husk,rice straw and industrial wastes like paper money sludge.A combination of sodium hypochlorite (NaClO) and hydrogen peroxide (H₂O₂) were used for pretreatment, cellulase from Trichodermareesei ATCC 26921 and Novozymes 188 for saccharification, and Saccharomyces cerevisiae KCCM 11304 were used for carrying out fermentation in an aerobic condition.Rice husk, rice straw and paper money sludge resulted in biofuel yield 0.45 ㎎/g, 0. 52 ㎎/g &1.26 ㎎/g respectively. Firstly, the objective of this study is to produce biofuel from raw materials which will treat with various combinations of the microbial strains after screening, and secondly, to reduce dependency on foreign oiland to remove disposal problem of wastes andmake environment safe from pollution.
Kang, Suk-Ku,Kim, Jung-Hawn,Shin, Yaung-Chul Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.6
Stereochemical control of the Wittig reaction of the primary aldehyde, 8-acetoxyoctan-1-al (7) with the nonstabilized alkylide, triphenylphosphonium n-butylide (6), was achieved by controlling the reaction conditions including solvent, temperature and inorganic salts. These conditions can be applied to the direct sythesis of the mixture of (Z)-, and (E)-8-dodecen-1-yl acetate, the sex pheromone of the oriental fruit moth, Grapholitha molesta. The primary aldehyde, 8-acetoxyoctan-1-al (7) was synthesized from 1,8-octanediol which is cheap and readily available.
최광윤,배수환,정재동,김한철,최영화 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The purpose of this experiment is an experimental study on recycling of waste concrete and suggest a possibility of the Recycled Aggregate Concrete after establishing some kinds of experimental properties of concrete. Therefore, this study compared and investigated properties of natural aggregate concrete and recycled aggregate concrete by replacing the ratio of recycled aggregates under the absorptions, compressive strengths and chemical resistances. As the result, the compressive strength and the chemical resistance of Recycled Aggregate Concrete is lower than the natural aggregate concrete. If was concluded that the properties of the recycled aggregates and lower than natural aggregates.
기술시대 지역정신을 존중하는 현대경관설계 : 북경사계스키장 경관계획 사례
丁山,이기철,박승범,남정칠,김승환,강영조 東亞大學校 建設技術硏究所 2007 硏究論文集 Vol.30 No.2
The Four-Season ski resort which is prepared for 2008 Beijing Olympic project is the biggest indoor ski-dome. The fundamental concept for landscape design is to harmonize the development of Beijing city via the construction of modern building, the culture of China and Olympic spirit. Thus, the concept is evolved from the satisfaction of public, the realization of ecology and the site-of-art technique. The project requires the value of regional spirit when carrying out the planning of landscape. Thus, the starting point of design is evolved from the respect for nature, humanism, culture, sustainable development of city and ecosystem.
소형 루프 히트파이프에 대한 작동특성 해석과 성능실험 연구
유성열(Seong-Ryoul Ryoo),성병호(Byung-Ho Sung),김철주(Chul-Ju Kim),강환국(Hawn-Kook Kang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A miniature Loop heat Pipe(LHP) has a great potential in cooling high power computer chips over a long distance. The present study was focused on modelling divers operational characteristics as a capillary limitation, heat transfer paths at the evaporator and those results were used to analyse the performance test data. The experimental model of LHP was designed to have a maximum capacity of heat transport of about 50W when operated under room air cooling condition. The evaporator was of a flat cylindrical shape(30D×14.5H㎜). Ethanol was used as a working fluid. Temperatures at the liquid and vapor lines, evaporator and condenser walls were measured.