The Load Model Composition Method in Power Systems Using Artifcial Neural Network

Rae‑Jun Park,송경빈,Kyungsang Lee 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2

An accurate load model is necessary to improve the accuracy of power systems dynamic stability analysis. Recent studies to estimate accurate load model have mainly been focused on the measurement-based load modeling and the method to estimate a single representative load model called load model composition or load representation. The current load model used for the dynamic stability analysis in South Korea power system was aggregated with the measurement data from only three distribution stations. The proposed algorithm is the load model composition method based on artifcial neural network technique using more measurement data than the algorithm to estimate the current load model. The proposed load model composition method using the artifcial neural network uses the load composition ratio as the input value and the ZIP model parameter, which is the estimation result at each distribution line, as the output value. The measurement data to estimate the parameter were collected from 105 distribution lines of 9 substations. The performance of proposed algorithm was verifed for three perspectives in the case studies. The accuracy of the proposed algorithm has been improved by comparing the measurement data with the calculated result by using the proposed model. The mean absolute percentage error (MAPE) between the measured data and the proposed model is 1.7%. The proposed algorithm could be applied to estimate the representative load model using data measured at multiple measurement points.

기업가지향성과 조직문화가 기업성과에 미치는 영향에 관한 연구

조형래(Jo, Hyung-Rae) 글로벌경영학회 2012 글로벌경영학회지 Vol.9 No.4

조직성과에 관한 오랜 연구에서는 그에 영향을 주는 요인들을 기업이 보유하고 있는 자원역량, 환경요 인, 전략적 구성, 경영관리 특성 등으로 보고 그러한 요인들을 중심으로 주요한 분석들을 수행해 왔다. 본 연구에서는 기업들의 성과에 영향을 줄 것으로 기대되는 조직문화적인 변수들을 중심으로 분석하였 다. 이를 통해 조직의 더 근원을 이루는 요소들을 분석함으로써 기업들에게 다른 시사점을 전해 줄 수있을 것으로 기대할 수 있다. 구체적으로 기업성과에 영향을 주는 조직문화의 요인으로서 기업가지향성, 참여적 문화, 사명감 문화 등을 고려하였다. 이론적 고찰의 결과 기업가지향성은 신제품개발에의 성과를 비롯한 여러 기업성과에 영향을 주는 요인으로 나타났고 참여적 문화, 사명감 문화도 기업의 여러 성과에 영향을 주는 요인으로 분석되었다. 따라서 연구의 모형과 가설은 이들 변수들이 기업성과에 어떻게 영향을 주는가 라는 점에 초점을 맞추어 수립되었다. 실증분석을 위해 89개의 기업체 자료들이 수집되 었다. 요인분석 결과 기업가지향성, 참여적 문화, 전략적 초점, 비전 공유의 4가지 변수들이 최종적인 독립변수로 선정되었고 기업성과는 재무적 성과, 비재무적성과, 전반적 성과의 세 가지로 구성되었다. 가설검증을 위한 회귀분석 결과 전략적 초점은 모든 종속변수에 중요하게 영향을 주는 변수로 나타났다. 기업가지향성은 비재무적 성과에 영향을 주는 것으로 나타났다. 조직문화 차원의 변수들이 고려되었으 므로 향후 기업들에서 얻을 수 있는 시사점들이 그에 따라 제시되었다. 즉 향후 기업에서 전략적 초점을 가지도록 하는 명시적인 경영 실무 뿐만 아니라 이러한 점들이 기업의 하나의 저변을 이루는 문화로서 정착될 수 있는 노력이 필요하다는 점을 기업들에게 말해 주고 있다. Until now most research on the performance of firms has dealt with management characteristics, strategic formulation, and firm capabilities as major influential variables. This study analyze the organizational cultural variables mainly which are expected to influence the performance of firms. We may anticipate to give some implications to companies through the analysis of more fundamental elements of an organization. Specifically entrepreneurial orientation, involvement culture, mission culture are considered as cultural variables. By theoretical review, we found that entrepreneurial orientation had influenced various firm performance including new product development performance as well as involvement culture and mission culture. Accordingly, we established research model and hypotheses focusing on how these variables influences firm performance. For empirical analysis, 89 samples of firms were gathered. By the result of factor analysis, we selected 4 main independent variables of entrepreneurial orientation, involvement culture, strategic focus, share of vision and 3 main dependent variables of financial performance, non-financial performance, comprehensive performance. After we implemented the regression analysis for the hypotheses testing, we found that strategic focus have significant influence on all of the performace indicators and that entrepreneurial orientation have significant influence on the non-financial performance. As we adopted variables of organizational cultural variables as main research variables, the implications of this research suggest that company should stress not only on the explicit management practices related to the strategic focus but also on the efforts which make these aspects to be set up as the culture underlying the organization.

조세회피와 발생액에 의한 이익조정이 회사채 신용등급에 미치는 영향

조영래(Cho, Young-Rae),김용(Kim, Yong) 한국산업비즈니스학회 2021 한국비즈니스연구 (비즈니스연구) Vol.5 No.1

본 연구에서는 2011년부터 2015년까지 유가증권시장에 상장된 기업들을 대상으로 신용등급이 상승하거나 또는 하락할 경우에 조세회피 및 발생액에 의한 이익조정이 회사채 신용등급에 어떠한 영향을 미치는 지를 분석하였다. 추가로 조세회피 및 이익조정의 지속성이 신용등급에 어떤 영향을 미치는지에 대해서도 분석하였다. 분석결과는 신용등급이 상승하는 경우에 조세회피가 1% 수준에서 유의적인 음(-)의 관계를 나타내었으며, 조세회피와 신용등급 상승의 상호작용변수는 유의적인 양(+)의 관계를 나타내었다. 이는 조세회피가 직전년도와 비교하여 신용등급이 상승하였을 때는 조세회피를 하려는 경향이 감소하기 때문이며, 또한 신용평가기관에서 신용등급이 상승할 때 조세회피는 감소할 것이라고 예측하여 보고된 이익을 그대로 반영하였기 때문이라고 판단된다. 그러나 신용등급이 하락하는 경우에는 이와 정반대의 결과를 도출하였다. 그러나 발생액에 의한 이익조정은 신용등급과 유의적인 관계를 나타내지 못하였다. 추가로 지속성이 회사채 신용등급에 영향을 미치는지를 검증하였는데, OLS회귀분석과 순서형 로짓회귀분석 모두 일부 이익조정(수정 Jones모형)의 경우 5% 수준에서 유의적인 음(-)의 관계를 나타내었다. 따라서 이익조정의 지속성은 신용등급에 부정적인 영향을 미친다고 볼 수 있다. 다만, 이들 관계는 측정치에 따라 차이가 나타나고 있다. 이러한 분석결과는 신용평가기관이 조세회피를 제대로 포착하지 못함으로써 신용위험을 왜곡시키고 나아가 신용등급에 대한 신뢰성을 떨어뜨릴 수 있다는 점을 시사하는 것으로 판단된다. This study empirically analyzed how tax avoidance affects bond credit ratings of listed companies on the korea exchange from 2011 to 2015. The results of this study are summarized as follows. First, the relationship between tax avoidance, earnings management and bond credit ratings was not statistically significant in all models. But In the case of a rise in bond credit rating, the relationship between the five years of accumulated cash effective tax rate(cashETR) were showed a significant negative(-) relationship at a 1% level. Also, if the bond credit rating declines, the results is the opposite of the case where the bond credit rating rises. Second, in determining whether continuous tax avoidance affects bond credit rating ratings, either the OLS analysis, or ordered logistics regression analysis, showed a significant negative(-) relationships only in the Jones Model at a 5% level. Third, The interaction effect of the decline in credit rating and persistence showed a significant negative(-) relationship at 1% level in all three models. Thus, the persistence of the tax avoidance can be seen to affect bond credit rating when combined with other factors that can interact. The results of this study suggest that many companies still avoid tax, but credit rating agencies are not able to capture them properly, thus distorting credit risk and decreasing credibility of credit rating.

노인의 댄스스포츠 참여동기가 삶의 질에 미치는 영향

박래영 원광대학교 대학원 2007 論文集 Vol.39 No.-

This study has the purpose of presenting fundamental information about such scholastic issues as participation of the old people in dancing sports in a move to vitalize it and Increase the population who practice it, by applying new approaches to comprehending the fever of dancing sports and examining the relationship between the motives of their participation in the sports and their living quality. For this purpose, a survey was conducted to 189 old men selected from those who partake in the dancing sports programs at the welfare centers for the elderly in Seoul area. SPSS/WIN 11.0 statistic program was employed to analyze the collected data by means of reliability, frequency, one-way ANOVA, correlation, multiple regression and Duncan's post-verification methods. The significance level of the statistical data was set at a= .05. From the outcomes of the analyses, following conclusions could be drawn: Firstly, in terms of motives for participation by demographic characters, statistically significant differences were found in the factor of achievement by age, in the factors of health, society, achievement and leisure by education, in the factors of health and achievement by monthly financial aid and in the factors of health, society, achievement and leisure by health status, respectively. Secondly, in terms of living quality by demographic characters, statistically significant differences were also found in the emotional area by age, in the cognitive area by education, in the emotional area by monthly financial aid and in the cognitive as well as emotional areas by health status, respectively. Thirdly, from the analysis into the correlation between motives of participation and living quality, the cognitive area was shown to have significant correlations in the factors of health, leisure, achievement and society while emotional area turned out to have significant correlation with the factors of health and social achievements. Fourthly, as for the impact the motive of participation in dancing sports has on the living quality, the cognitive area was revealed to account for 14.5% of comprehension, a statistically significant relationship which may yield positive influence on society, leisure and health in order but negative influence on achievement. The emotional area accounted for 9.3% of comprehension, a statistically significant relationship which may yield positive impact on health, society and achievement in order but negative impact on leisure. In sum, it may be concluded that the dancing sports should be regarded to have cognitive as well as emotional values not only for the aged but also for all contemporary people as far as it serves as stimulants to promote the will for life and, thus, improve living quality in the multifaceted society like now, beyond its simple motives and functions for maintaining health and exercising physical fitness.

경제자유구역의 노사관계

박래영 홍익대학교 경제연구소 2004 經濟硏究 Vol.19 No.-

지식기반경제와 노동시장의 변화

박래영 홍익대학교 경제연구소 2001 經濟硏究 Vol.16 No.-

體育療法의 프로그램 開發을 위한 追跡的 硏究(Ⅴ) : 少年院生을 위한

李來華 慶北大學校 體育科學硏究所 1992 체육과학연구지 Vol.8 No.-

A study for programing a physical theraphy was attempted for the second time following 1986. This study dittered from last study approached in a viewpoint. This study maked concrete the last one that was the general contents. Therefore all juvenile reformatories ought to examine the program in connection with their peculiarity by admiting it along with the last program proposed, I want to get ready reference materials to improve and make concrete this program. and for the utility of reform education by physical theraphy, at hoped that the administration authorities ought to enlarge the role and function of juvenile reformatory by preparing all systematic provisions.

기업실패위험이 회계이익의 정보유용성에 미치는 영향

姜來撤 홍익대학교 경영연구소 2007 경영연구 Vol.32 No.-

Generally accepted accounting principle is based on gomg concern assumption. However the earnings information's informativeness will be lowered when the firm have going concern problem. To obtain the empirical evidence on this reasoning, this article analyzed effect of the firm's default risk on accounting earnings' role as source of useful information. The article analyzed the capital market participants' interpretation of earnings information of the firm that have financial problem. Default risk is measured with audit opinion and considered the firm which received going-concern modified opinion as having high default risk. The empirical evidence was consistent with the inference that market's response on earnings information will be lowered when the audit opinion is modified for going concern problem.

國際比較分析을 통한 韓國勞使關係의 方向探索

朴來榮,丁海本,李 均,林昌喜 홍익대학교 경제연구소 1989 經濟硏究 Vol.5 No.-

體育學習에 對한 認知構造에 關한 調査分析 : 本 大學校 女學生들을 中心으로

李來華,金雅子 慶北大學校 1975 論文集 Vol.20 No.-

This study analysed the students' consciousness in leanrning physical education by means of the students responded to the given inquiry, which is shown on Table 1. The results obtained can be summarized as follows: the structure of consciousness of the students in learning physical education shows a clear sense of purporse; their inclination to the interest and learning attitude are sound and encouraging; they count much of the achievements though there were some difference among the grades; they showed desirable response to the school hours and even clearly presented their hope for the leisure; their requests are greatly various, pocing problem soon almost the whole fields physical education should aim at. In brief, the structure of consciousness of the students are very sound and reasonable and their inclination is considerably progressive. Here we are sure that the original missions of physical education can be fulfilled if they are offered the rational opportunities of learning, the human and material conditions with proper measures of the school authority accompanied.