• 조명전기설비학회논문지
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• 제26권2호
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• pp.18-26
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• 2012

Though electricity consumption amount in industry has been increased gradually, corresponding power supply show symptoms of marginal point. Importance of demand-side management from large-industries has also been raised. This paper deals with induction motor, which is one of representative examples of heavy electricity consumption utilities, to analyze potential technical capability, economic feasibility from consumers' viewpoint and demand-side management feasibility from nation-wide perspective. Nation-wide economic feasibility analysis was done through California test, which has been used as demand-side management evaluation model. This paper also describes limitation of existing high efficiency induction motor in terms of contribution to demand-side management and utilizes premium motor to calculate demand-side management contribution level and economic feasibility evaluation. Likewise, this paper emphasizes the efficiency improvement of induction motor and analyzes how much premium motor related technologies can contribute to demand-side management.

• 농촌계획
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• 제14권4호
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• pp.109-119
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• 2008

The objectives of this study are to develop a green tourism potential evaluation method with rural amenity and demand of citizen. The new index which was named GPD(green tourism potential degree) is designed to propose the green tourism potential of rural areas using spatial analysis of geographic information system and spatial interaction of gravity model. And in order to evaluate the green tourism potential with supply side and demand side, two indices were defined; One is green tourism demand degree(GDD) which is developed to quantify a demand side potential by the analysis of urban population and urbanization index, and the other is green tourism attraction degree(GAD) which is developed to quantify a supply side potential by the analysis of rural amenity values using AHP algorithm, based on opinion of related experts. The developed method was applied to a part of Kyounggi province, Seoul and Incheon. All the study area's GAD, GDD and GPD were assessed and the proposed green tourism potential evaluation method could be used in developing rural development plans and green tourism policies considering spatial interaction with citizen and green tourism resources.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.512-517
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• 1998

In a matrix converter, input side and output side are coupled with each other through switching elements. Since disturbances on either side affect directly on the other side, it requires a high-speed on-line control system to compensate them. We proposed in previous papers a new control strategy and an on-line control circuit for a matrix converter. The control circuit could keep the output voltage at commanded value against fluctuation in the supply voltage. Furthermore wave forms of the output voltage and the input current were always kept sinusoidal. The switching pattern was generated by comparing modified voltage references with a carrier. The carrier was synchronized with the supply voltage using a PLL system, which made the control circuit complicated and costly. This paper discusses on the possibility of an asynchronized carrier. Experiment results show the input current distortion in case of asynchronous carrier is bigger than that of synchronous carrier. However, the deterioration can be minimized by increased carrier frequency.

• 노동경제논집
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• 제42권1호
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• pp.43-72
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• 2019

Oaxaca의 임금격차 요인분해법을 활용하여 대기업과 중소기업의 임금격차를 분해한 결과, 공급측 요인의 총임금격차는 44.2%였으며, 근속연수와 학력이 가장 크게 영향을 미쳤다. 그리고 기업의 경영실적 등 수요측 요인에 의한 기업 규모별 임금격차를 분해한 결과, 총임금격차는 44.9%였으며, 임금격차에 미치는 영향력은 노동생산성, 노조, 외주비율 순으로 컸다. 이러한 분석결과는 기업 규모별 임금격차를 해소하기 위해서는 인적자본의 차이 등 공급측 요인뿐만 아니라 기업의 경영실적과 자본구조 등 수요측 요인도 함께 고려할 필요가 있음을 시사한다.

• 농촌계획
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• 제27권3호
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• pp.93-102
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• 2021

This study was attempted to provide a scientific basis for the problem of location selection by spatial scale for efficient promotion of projects related to green care farm complex. Location potential assessment system in local government scale consists of two major components from demand-side and supply-side consideration. The demand-side aspect considered the characteristics of potential users, while supply-side aspect used total 18 indices over 8 divisions under 3 fields. For the location potential assessment in district scale, total 8 indices under 3 major divisions were considered based on biological, physical, social, and economic environment. The application results of the location potential evaluation system in local government scale(excluding metropolitan cities) showed high location potential in southern Gyeonggi Province and near Busan Metropolitan City. As a result of applying the district-scale location potential evaluation system to Geumsan-gun, Geumsan-eup, Chubu-myeon, and Jewon-myeon have high potential. Further studies to improve the applicability of the developed indices are recommended by enhancing assessment indices, complementing base data, and reinforcing with spatial analysis.

• 한국산업융합학회 논문집
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• 제20권4호
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• pp.275-284
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• 2017

As the high-level of the industrial and information age, the electricity become the indispensable element in the daily life including OA, FA, and computer, electric home appliances, and etc. In particular, The continuous use of the high capacity power supply system by applying a Switching Mode Power Supply(SMPS) according to the increase of the secondary side output terminal of the power load of the refrigerator of the home appliance or automation of the plant is pressed. The purpose using the way with this kind of high-capacity altogether is to supply the output voltage and output current regardless of the input voltage or to the external environmental conditions of the secondary-side load fluctuation. In this paper, a combination of a Buck Converter with Boost Converter by making a constant current source to control the inductor current and maintain stable power supply side operating characteristics, when load variations. While maintaining the same characteristics as conventional Buck Converter, and offer a DC-DC Converter system with the new switch pattern having a wide output range capable of operating in Buck-Boost Converter. In addition, after theoretical analysis, we carry out simulations and experiments to verify the validity and performance comparing with a conventional DC-to-DC converter.

• 기술혁신연구
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• 제24권3호
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• pp.139-159
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• 2016

본 연구는 이공계 대졸자 초기노동시장 경력개발 모형 연구로 과학기술인력의 경력개발을 촉진하는 요인을 살펴보고자 하였다. 과학기술인력의 경력에 영향을 미치는 요인을 포괄한 세 가지 로짓 분석 모형을 구성하고 분석하였다. 과학기술인력 전문직업에 안착하는 요인을 분석하기 위한 설명변수는 크게 2011년 일자리 속성, 현재 일자리 속성, 근로조건 변화 속성, 취업 노력 속성, 대학 교육 속성, 인적 속성 등으로 나누어 구성하였다. 세 가지 분석 모형은 일자리 속성 위주의 설명변수를 주로 포함한 수요측면 모형, 취업노력이나 대학 교육 속성 등을 중심으로 한 공급측면 모형, 모든 설명변수를 포함한 종합 모형이다. 분석 결과 과학기술인력의 안정적인 경력개발을 위해서는 대학교육 등 공급측면보다 수요측면의 일자리 속성이 훨씬 더 중요하게 나타났다. 결국 초기에 안정적으로 과학기술전문직업에 안착할 수 있도록 좋은 일자리 창출과 매칭 정책이 가장 절실한 정책이다.

• 자원ㆍ환경경제연구
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• 제19권2호
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• pp.243-282
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• 2010

본 연구는 1991년~2007년간 우리나라 전력산업의 탄소배출에 미치는 요인들과 영향의 정도를 전력 수요측면과 공급측면으로 나누어 요인분해분석을 수행하였다. 전력수요측면에서는 전력사용의 효율성 향상이 배출 감소에 주된 영향을 미치는 반면, 전력을 소비하는 산업의 구조 변화는 오히려 배출을 증가시키는데 기여했음을 확인하였다. 공급측면에서는 탄소배출에 미치는 주요 요인으로 연료혼합, 화력발전효율, 발전구조의 변화 등이 있었으며 분석 결과 전력수요의 증가와 화력발전의 구조 변화가 탄소배출을 증가시키는 주요한 요인으로 작용한 반면 연료효율성은 향상되어 배출을 감소시키는 역할을 한 것으로 나타났다. 이로써 전력산업의 온실가스 감축을 위해 수요차원에서는 전력사용의 효율성을 향상시키고 공급차원에서는 화력발전을 대체하면서 발전 및 배출 효율성을 향상시킬 수 있는 정책이 마련되어야 한다는 것을 알 수 있었다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.131-132
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• 2012

Implementation of fuzzy controller for the rotor side converter of a utility-connected double-fed induction generator (DFIG) for wind power generation systems (WPGS) described in this paper. In the control schemes, real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid. A TMS320VC33 DSP is selected as the controller of this system.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2003년도 학술대회논문집
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• pp.349-354
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• 2003

Airport facility is infrastructure that become external creditworthiness and linear measure of country competitive power. Among them, receive and supply of electric power facility of airport is very important in peculiarity, trustability, safety side of airport. In this parer, sorted domestic airline as 4 classes by code to accomplish standardization for receive and supply of electric power facility of airport. And established justice and coverage about receive and supply of electric power facility using without any standard present and analyze problem for receive and supply of electric power facility of existing airport and presents standard. Finally, present standard single-line diagram by airport grade and system grade standard of receive and supply of electric power facility of airport.