• 자원ㆍ환경경제연구
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• 제22권2호
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• pp.329-365
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• 2013

본 연구의 목적은 2000-2009년 국가별로 환경과 화석에너지의 제약 하에서 경제와 환경의 효율을 측정하고자 함이다. 본 연구는 국가별 소득수준에 따른 OECD국가, 중고소득국가, 저소득국가 등 세 그룹으로 구분하여, 생산가능집합에서 바람직한 산출물인 GDP와 오염물을 동시에 포함한 '환경지향형, 경제지향형, 환경-경제지향형, Two-stage DEA모형' 등의 네 가지 방법을 제시하여 비교한다. OECD국가는 상대적으로 경제효율성이 높으나 환경효율성은 낮았고 비OECD국가는 환경효율성이 높고 경제효율성이 낮았다. 화석에너지와 온실가스의 저감의 여지는 OECD국가가 더 높았다.

• 설비공학논문집
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• 제19권6호
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• pp.476-484
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• 2007

Recently, in accordance with the buildings are becoming to large-sizes, high-stories, the large scaled facilities and equipments in machine room are quite demanding, and the generated noise volume according to this situation is on increasing. Since such noise is becoming to the object of a serious civil appeal, it is the real situation that a reduction countermeasure against the machine room equipment noise is keenly necessitated. On such viewpoint, this study has recorded, measured the noises which were generated from each individual as same as the whole equipped machines and tools, on the object of the dormitory machine rooms of the 3 colleges that haying mutually different peculiarities, then after grasp-ing their characters and acoustic powers, this research has verified its prediction possibility and the authenticity by comparison the estimated numerical value with the actually measured numerical value through the acoustic simulation. After grasping the prediction possibility in such way, by utilization of the sound absorption material in the machinery room, from the stage of design, the soundproof measures for the noise reduction at machine room could be regulated effectively, and it is also considered that such data would be utilized as the fundamental material for an establishment of the measure for sound insulation.

• 한국정보처리학회논문지
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• 제2권2호
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• pp.176-184
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• 1995

소프트웨어 재사용은 생산성과 품질을 높일 수 있는 유망한 방법임에도 실제로는 잘 활용되지 못하고 있다. 이러한 문제는 소프트웨어 품질에 대한 정략적인 측도가 부재한 이유일것이다. 본 논문에서 제안한 재사용 소프트웨어의 정량하는 기존의 소프 트웨어로부터 모듈을 추출한 후 이 모듈을 재사용 평가측도에 적용하여 재사용 여부를 측정하는 것이다. 먼저 재사용할 모듈을 측정하기 위해 품질의 인자를 범용성, 단순성, 유지보수성, 모듈성으로 구분하였으며, 인자별로 모듈을 분류 측정한 후 최정적으로 재사용 여부를 결정하게 된다. 제안한 측도의 장점은 재사용하고자 하는 모듈을 정량 적으로 측정하므로 부적절한 모듈의 재사용을 조기에 정확히 발견할 수 있다.

• 한국조경학회지
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• 제22권4호
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• pp.75-80
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• 1995

It is important to estimate the possibility of recovery in physiologically damaged woody plant. It is suggested that C.E.R(cambial electrical resistance) might be a useful method to predict the permanent wilting point. D/A and A/D converter can be used to measure the C.E.R and it took only 10-20 msec for a measurement and the values were stable during this study. A computer could be used for the continual measurement of C.E.R. There were very big daily changes of C.E.R. was changed according to the changes of indoor temperature, but the phase was slightly different. It is reasoned that daily changes in C.E.R. is induced by the changes of water potential and cambial thickness. It was difficult to detect the changes of C.E.R. caused by changes in soil moisture under high soil water potential. Under low soil water potential, the changes in soil moisture under high soil water potential. Under low soil water potential, the changes of C.E.R. can be detected. After wilting, C.E.R. is increased very rapidly. When C.E.R. is not decreased by watering, it will be permanent wilting point. But it takes several days to confirm the permanent wilting point. To predict the possibility of recovery from wilting, the values of C.E.R. have no meaning. But the changes of C.E.R. are significant. Therefore we can predict the permant wilting point in woody plant by monitoring the change of C.E.R. by the computer.

• 한국항만학회지
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• 제14권4호
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• pp.475-479
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• 2000

A possibility of the implementation of a quartz crystal sensor to the determination of chemical oxygen demand is examined by checking the electrochemical behavior of the sensor in a glucose solution. Since the surface of a quartz crystal has to be oxidized, a relatively active metal is coated on the surface of a usual 9 MHz AT-cut crystal. The electrochemical behavior is investigated by measuring the changes of current, resonant frequency and resonant resistance while a constant potential is applied. The crystal is installed in a specially designed container, and a quartz crystal analyzer is utilized to measure the frequency and resistance simultaneously. The variations of the measurements are examined at different concentrations of glucose solution, and a proper relation between the concentrations of glucose solution, and a proper relation between the concentration and the measurements is analyzed. As a result, it is found that a linear relation between the concentration of less than 900 ppm and the peak current when a constant potential of -180 mV (SSCE) is applied. The relation can be utilized for the determination of glucose concentration in sea water, and considering a direct relation between gluose concentration and chemical oxygen demand tells a possibility of the measurement of chemical oxygen demand using quartz crystal oscillators.

• 공학교육연구
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• 제24권6호
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• pp.40-49
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• 2021

The purpose of this study is to explore the possibility of changing students' learning styles and preferred teaching styles after applying the flipped learning method to engineering education. In order to achieve the purpose of this study, literature review and survey study were conducted. The subject of application of the flipped learning method is the 'Creative Problem Solving Methodology' class, which is one of the specialized liberal arts subjects operated for students of the college of engineering at D university in Gyeonggi-do. For the survey study, a tool adapted to the domestic conditions of Kolb's learning style test tool and Felder & Silverman's preferred teaching style test tool was used. In addition, pre- and post-tests were conducted to measure changes in the learning styles and preferred teaching styles. As a result of applying the flipped learning method for one semester, the learning style showed a tendency to change from an accommodative to a divergent learner. In addition, in the case of the preferred teaching styles, it was confirmed that there were statistically significant changes in the organization and the area of participation. Based on these findings, a proposal for a follow-up study was presented.

• 디지털융복합연구
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• 제17권1호
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• pp.327-335
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• 2019

개인맞춤생산은 4차산업혁명속에서 변화하는 생산과 소비를 대표하는 개념이다. 각 분야의 생산업체들은 이 개념을 도입하기 위해 많은 노력을 하고 있으나 공예분야, 특히 사회 곳곳에 퍼져있는 공방체제에서는 이와 같은 변화의 흐름을 찾아보기 어렵다. 이에 변화하는 생산과 소비에 발맞추어 공예공방속에서 개인맞춤생산을 융합할 수 있는 가능성을 가늠해 보고자 한다. 이를 위해 유사한 체계인 대량맞춤생산의 개념과 실예를 살펴보고 개인맞춤생산을 정의한 후 현대 공예 공방의 제작현황을 인지하고 결과적으로 생산성과 소통이라는 두 가지 기준점을 삼아 융합의 가능성을 살폈다.

• The Journal of Asian Finance, Economics and Business
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• 제8권7호
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• pp.509-516
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• 2021

This study aims to find out and measure the level of factors affecting the applicability of environmental management accounting (EMA) in Vietnamese automobile industry enterprises. Data was collected using both quantitative and qualitative methods. First, in general research, qualitative methodology was used to find out factors (variables) that can impact the possibility of implementing EMA in Vietnamese automobile enterprises. Second, in detailed research, all variables are measured using a quantitative method by collecting data through sampling and sending questionnaires. 500 questionnaires were sent to automobile enterprise managers and only 352 questionnaires met the criteria for the data analysis. The study used a mixed research design approach- a procedure for collecting, analyzing, and "mixing" both quantitative and qualitative research and methods in a single study to understand the research problem. Results show that 7 factors affect the possibility of implementing EMA in Vietnamese automobile industry enterprises. These factors are coercive pressure, normative pressure, mimetic pressure, business environmental uncertainty, environmental strategy, benefits when applying EMA, and task complexity. Based on the results of the study, promoting EMA in the automotive industry should depend mainly on the role of governmental departments.

• 한국자동차공학회논문집
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• 제19권1호
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• pp.133-138
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• 2011

Compression pressure of individual cylinder and valve timing have big influence on combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Therefore, uniformity of compression pressure and valve timing became one of most important engine design and production standard. Conventional method to evaluate compression pressure uniformity is to measure each cylinder pressure by mechanical pressure gage during cranking. This conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results from battery status and also causes high manhour and cost. To check valve timing, related FEAD parts should be disassembled and timing mark should be checked manually. This study describes and suggests new methodology to measure compression pressure by analysis of start motor current and to check valve timing by cylinder pressure with high accuracy. With this new methodology, possibility to detect leaky cylinder and wrong valve timing was observed.

• 한국화재소방학회논문지
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• 제15권4호
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• pp.71-77
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• 2001

현재 국가기간망의 주요 핵심인프라시설로서 급격히 증가하고 있는 지하공동구의 화재발생에 따른 피해 및 그 영향이 심각함에 따라 국내외의 공동구 화재의 유형을 분석 후에 선진국의 공동구의 화재안전을 위한 성능기준을 국내의 성능과 비교하여 문제점을 발췌하였다. 발췌한 문제점에 나타난 핵심요소를 선진국과 비교하여 국내 공동구에 시급히 필요한 구비성능을 제시하되 국내의 공동구 관리운영 및 공동구에 수용되는 시설물의 설치기준에 적합한 방안을 연구하여 제시하였다.