• 한국지열·수열에너지학회논문집
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• 제14권3호
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• pp.8-14
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• 2018

PV module power is calculated on PV module surface temperature adjustment by irradiation on the summer and autumn in NOCT(Nominal Operating Cell Temperature) conditions. The summer and autumn periods were selected because of large variation in outdoor air temperature and irradiation. This study was performed to understand relationship between PV module surface temperature and photovoltaic power using field measurement. As a results, it was determined that the amount of irradiation was proportional to the amount of photovoltaic power in the field measurement. However, it was also identified that the PV power generation decreased by increased PV module surface temperatures due to irradiation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 전문대학교육위원
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• pp.68-71
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• 2004

Frequency is an important operating parameter of a power system. Electric power systems sustain transient frequency swings whenever the balance between generation and load does not no longer hold. To cope with this Constraints, it requires an accurate and high speedy frequency deviation estimation technique and suitable adjustment to obtain the power system energy balance. This paper describes the design, computational aspects and implementation of an iterative technique for measuring power system. The rate change of the phase angle is used for estimation. To confirm the validity of the proposed algorithm, the simulation studies carried out on a typical 154[KV] double T/L system by using EMTP software. Some test results are presented in the paper.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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• pp.92-95
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• 2003

Frequency is an important operating parameter of a power system. Electric power systems sustain transient frequency swings whenever the balance between generation and load does not no longer hold. To cope with this Constraints. it requires an accurate and high speedy frequency deviation estimation technique and suitable adjustment to obtain the power system energy balance. This paper describes the design, computational aspects and implementation of an iterative technique for measuring power system. The rate change of the phase angle is used for estimation. To confirm the validity of the proposed algorithm, the simulation studies carried out on a typical 154[KV] double T/L system by using EMTP software. Some test results are presented in the paper.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 전문대학교육위원
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• pp.145-149
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• 2005

Frequency is an important operating parameter of a power system. Electric power systems sustain transient frequency swings whenever the balance between generation and load does not no longer hold. To cope with this Constraints, it requires an accurate and high speedy frequency deviation estimation technique and suitable adjustment to obtain the power system energy balance. This paper describes the design, computational aspects and implementation of an iterative technique for measuring power system. The rate change of the phase angle is used for estimation. To confirm the validity of the proposed algorithm, the simulation studies carried out on a typical 154[KV] double T/L system by using EMTP software. Some test results are presented in the paper.

• 경영과정보연구
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• 제31권1호
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• pp.89-116
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• 2012

본 논문은 2001년부터 2010년의 표본기간 동안 상장된 제조업을 대상으로 Shyam-Sunder and Myers(1999) 그리고 Frank and Goyal(2003)의 목표조정모델과 자본조달순위모델에 기초하여 Chirinko and Singha(2000)의 비판적인 관점이 반영된 실증분석 논문이다. Shyam-Sunder and Myers(1999)의 모형을 통해 분석한 결과, 목표 조정계수는 0과 1 사이에 값을 가지며 설명력이 높고 유의한 변수인 반면에 자금 부족분 계수는 0에 가까워 자본조달이론을 지지 하기에는 작은 값을 가졌다. 또한 Frank and Goyal(2003)의 방법론을 사용하여 실증분석한 결과 자본조달순위이론은 지지되지 않았다.

• 한국의료질향상학회지
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• 제10권2호
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• pp.164-175
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• 2003

Objectives: To evaluate the performance of models to predict AMI patients death using severity adjustment measures in Korea. Methods: Medical records of 861 patients treated by AMI in 7 general hospitals during 1996 and 1997 were reviewed by trained nurses. We measured the severity of patients by APACHE III, MedisGroups, CSI and DS. Using each severity method a predictive mortality for each patient was calculated from a logistic regression model including the severity score. The statistical performance of each severity method model was evaluated by using c-statistics and R2. For each hospital, z scores compared actual and expected mortality rates. Results: The overall in-hospital mortality was 14.5%, ranged from 10.0% to 22.2%. The distributions of severity scores for each method was significantly different by hospitals. The four severity-adjusted models to predict AMI patients death varied in their statistical performance for discrimination power of patients death. Order of Severity-adjusted mortality rates and z scores by four severity measures was different. Conclusion: Severity-adjusted mortality rates of AMI patients might be applied as an indicator for hospital performance evaluation in Korea. Because different severity methods frequently produce different impressions about relative hospital performance, more studies has to be done to use it as quality indicator and more attention should be paid to select appropriate severity measures.

• 한국사회복지학
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• 제52권
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• pp.143-170
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• 2003

다양한 형태의 심리사회적 개입이 우울증을 겪는 클라이언트에게 가져오는 변화는, 대략, 우울증상의 완화와 클라이언트 개인이 수행하던 사회기능의 증진이다. 우울증에 대한 기존 임상적 개입의 성과 연구에서 이러한 변화의 측정자로서 클라이언트에게 의미있는 타자인 가족이나 친척 혹은 친구(친지)의 역할은 간과되어 왔다. 본 연구는 우울 클라이언트의 일상생활의 다양한 측면을 자세히 관찰할 수 있는 친지의 위치에 초점을 두어 친지의 클라이언트에 대한 측정의 유효성을 고찰하였다. 미국에서 수행된 한 우울증 치료를 위한 심리사회적 개입연구의 자료를 사용하여 클라이언트의 친지가 치료개입 전 후 우울증상과 사회기능을 어떻게 보며, 그 측정이 치료 종결 후 6개월 및 1년이 경과된 시점(추적 기간)에서 클라이언트가 보이는 우울증상과 사회기능을 얼마나 설명하는가를 탐구하였다. 세 가지 주요 발견은 다음과 같다. 첫째, 일반적으로 치료 전 보다는 치료 후에 친지가 측정한 우울증상과 사회기능이 추적기간 중 클라이언트의 증상과 사회기능을 더 강하게 설명하였다. 둘째, 특히 친지가 측정한 사회기능의 네 척도 중 클라이언트의 실제적인 수행에 대한 측정과 친지가 기대하는 수행 정도의 측정이 추적기간 중 우울증상 및 사회기능을 유의하게 설명하였다. 셋째, 친지의 치료 전 측정 중 사회기능 측정은 증상 측정이 추적기간 중 사회기능의 변량을 설명하는 것 이상의 설명력을 추가하였다. 치료 후 측정에서는 친지의 증상 측정이 사회기능 측정이 추적기간 중 증상 및 사회기능의 변량을 설명하는 것 이상으로 설명력을 추가하였다. 이러한 발견은 정신건강전문가와 연구자들이 친지를 클라이언트의 치료에 참여하여 도움을 줄 수 있는 협력자로 여겨야 한다는 주장을 뒷받침할 수 있다. 연구 결과와 관련한 논의 및 함의를 고찰하였고 본 연구의 한계점 및 후속연구를 위한 제언을 하였다.

• Tribology and Lubricants
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• 제25권5호
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• pp.311-317
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• 2009

To satisfy the more severe emission regulation and the demand of higher fuel economy in near future, the combustion pressure and power output of engines is going to be higher. In order to get the reduction of engine emission and the higher power, it is needed the reduction of the tension and width of ring pack. The lower tension ring and the thinner width ring can bring not only the friction reduction between the ring and liner during engine running, but also the adjustment of the blow-by gas and oil consumption by changing in the pressure in the crevice volume and the axial motion of rings togethe with the adjustment of the inter-ring crevice volumes. In this study, by using a developed basic computer proglram that predicts the blow-by gas and oil consumption of engines, it is to be examined how satisfying the level of the blow-by gas and oil consumption as being installed the piston ring pack with thinner width ring and lower tension ring.

• 가정과삶의질연구
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• 제9권2호
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• pp.345-366
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• 1991

The concrete purpose of this study is to examine the possibility of applying S.Minuchin's structural family therapy theory to each clinical families so that it can solve efficiently the clinical problems Korean family. The test results are as follows: 1)The Results of Question I : Types of Korean family problems can be divide into six. Then the most frequent type of problem was marital problem. 2) The Results of Question II: Korean normal family showed rater difussed boundary and higher rate of wife dominant type than that of husband dominant type in aspect of boundary and power, and had low tendency toward alignment and neutral adjustment. 3)The Results of Quesion III; Amidst the clinical families, family structural traits of the families which have marital problems showed a clear boundary, the tendency toward alignment, and higher tate of husband dominant type than that of wife dominant type. And family structural traits of children problem family had the tendency of alignment and showed little wife-dominanted families in power. Finally, mother-in -law and daughter-in-law problemed family had several characters such as diffused boundary, the tendency of alignment and high adjustment. 4)The Results of Question IV : As a result of camparing problemed families with normal families in family structure, there was high adaptability of S.Minuchin's structural theory to the two family groups; the groups of marital problems and those of children problem.

• Journal of Power Electronics
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• 제16권3호
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• pp.946-959
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• 2016

A novel Virtual Space Vector (VSV) modulation strategy for complete control of potential neutral point (NP) issues is proposed in this paper. The neutral point potential balancing problems of multi-level converters, which include elimination of low frequency oscillations and self-balancing for NP dc unbalance, are investigated first. Then a set of improved virtual space vectors with dynamic adjustment factors are introduced and a multi-objective optimization algorithm which aims to optimize these adjustment factors is presented in this paper. The improved virtual space vectors and the multi-objective optimization algorithm constitute the novel Virtual Space Vector modulation. The proposed novel Virtual Space Vector modulation can simultaneously recover NP dc unbalance and eliminate low frequency oscillations of the neutral point. Experiment results show that the proposed strategy has excellent performance, and that both of the neutral point potential issues can be solved.