Support Vector Regression을 이용한 소프트웨어 개발비 예측

박찬규,Park, Chan-Kyoo 한국경영과학회 2006 經營 科學 Vol.23 No.2

The purpose of this paper is to propose a new software development cost estimation method using SVR(Support Vector Regression) SVR, one of machine learning techniques, has been attracting much attention for its theoretic clearness and food performance over other machine learning techniques. This paper may be the first study in which SVR is applied to the field of software cost estimation. To derive the new method, we analyze historical cost data including both well-known overseas and domestic software projects, and define cost drivers affecting software cost. Then, the SVR model is trained using the historical data and its estimation accuracy is compared with that of the linear regression model. Experimental results show that the SVR model produces more accurate prediction than the linear regression model.

최단경로문제의 다수치명호의 발견적 기법

박찬규(Chan-Kyoo Park),안재근(Jaegeun Ahn),정호연(Hoyeon Chung),박순달(Soondal Park) 대한산업공학회 1998 대한산업공학회 춘계학술대회논문집 Vol.1998 No.4

대규모 기업집단의 순환출자 해소를 위한 최적화 모형

박찬규(Chan-Kyoo Park),김대룡(Dae Lyong Kim) 한국경영과학회 2009 韓國經營科學會誌 Vol.34 No.4

Circular shareholdings among three companies are formed when company A owns stock in company B, company B owns stock in company C, and company C owns stock in company A. Since circular shareholdings among large family-controlled firms are used to give the controlling shareholder greater control or more opportunities to expropriate minority investors, the government has encouraged large business groups to gradually remove their circular shareholdings. In this paper, we propose a combinatorial optimization model that can answer the question, which equity investments among complicated investment relationships of one large business group should be removed to resolve its circular shareholdings. To the best knowledge of the authors, our research is the first one that has approached the circular shareholding problem in respect of management science. The proposed combinatorial optimization model are formulated into integer programming problem and applied to some Korean major business groups.

구매가격 변동 하에서 초기재고 재분배를 통한 위험회피 재고모형의 효율화

박찬규(Chan-Kyoo Park) 한국경영과학회 2013 韓國經營科學會誌 Vol.38 No.2

In traditional inventory models, purchase prices of raw materials are assumed to be fixed and have no effect on the optimal choice of inventory policies. However, when purchase prices fluctuate continuously over time, inventory costs are heavily affected by purchasing prices. Risk-averse inventory model decides order quantity and ordering time by considering not just purchase prices but also the risk from the discrepancy between estimated prices and realized prices.<br/> In this paper, we propose a myopic inventory policy which incorporates price risk into deciding ordering time and quantities. While the existing risk-averse model has no mechanism to reallocate inventories already purchased for a specific future period, the revised one reallocates initial inventories of each period to other future periods so that it can avoid purchasing raw materials at high prices. Experimental results demonstrate that the revised model outperforms the existing one in respect of total cost and variability.

삭제나무를 이용한 새로운 순서화 방법

박찬규(Chan-Kyoo Park),도승용(Seung-yong Doh),박순달(Soon-dal Park) 대한산업공학회 2003 대한산업공학회지 Vol.29 No.1

사회네트워크 중심성 지표를 이용한 기업집단 소유네트워크 분석

박찬규(Chan-Kyoo Park) 한국경영과학회 2015 經營 科學 Vol.32 No.2

Large business groups typically have central firms through which their controlling families establish (or acquire) new firms and maintain control over other member firms. Research on corporate governance has developed metrics to identify those central firms and investigated an impact of the centrality on ownership structure and firm"s financial performance. This paper introduces centrality metrics used in social network analysis (SNA) to measure how crucial a role each firm plays in the ownership structure of its business group. Then, the SNA centrality metrics are compared with the metrics developed in corporate governance field. Also, we test the relationship between the SNA centrality metrics and firm"s value. Experimental results show that the SNA centrality metrics are closely correlated with the centrality metrics used in corporate governance and are significantly correlated with firm"s value.

대기업집단 내 계열사의 중심성과 신용등급에 관한 실증연구

박찬규 ( Chan-kyoo Park ),전진규 ( Jin Q Jeon ) 국제지역학회 2018 국제지역학회 춘계학술대회 Vol.2018 No.-

본 연구에서는 국내 대기업집단의 특수성에 따른 그룹 내 계열사의 최종신용등급 결정논리에 대하여 살펴보고자 하였다. 먼저 내생성 통제 후 분석 결과 그룹 계열사의 신용등급이 일반기업의 신용등급보다 높게 나타났다. 또한 3개 신평사 모두 그룹 내 임계중심성 지수(Almeida et al., 2011)가 높은 계열사일수록 낮은 신용등급이 부여되는 것으로 나타났으나 이와 같은 관계는 비선형적으로 관찰되었다. 이는 그룹 지배주주가 중심기업을 이용하여 재무적으로 열악한 계열사에 대한 지원(propping) 가능성이 신용등급에 고려되었기 때문으로 해석될 수 있다. 이와 같은 임계중심성에 따른 신용등급의 차이는 그룹 전체가 활황일 때 경제적·통계적으로 더욱 유의하게 나타났다. 본 연구는 그룹 내 계열사의 신용등급 결정논리에 대한 이해를 돕는 최초의 연구라는 점에서 의의가 있다. In this study, we investigate the determinants of credit ratings for affiliated companies of the Korean Chaebols, considering the distinct characteristics of the Chaebol structure. After controlling for an endogeneity, we find that the average credit ratings for Chaebol affiliated firms are significantly higher thant those of non-Chaebol affiliated firms. Next, we estimate the critical Control Threshold and Position established by Almedia et al. (2011) and apply those measures to credit ratings of affiliated firms. The results show that affiliated firms with lower centrality measures tend to have higher credit ratings, while the relationship is not linear, suggesting that it might be considered the possibility that controlling shareholders use central firms to provide firms with lower centrality with operational and financial supports, ie, propping. The phenomena that firms with lower centrality have higher credit ratings is more manifest when there is a group-wide boom. This suggests that propping is more likely to emerge in a economic boom. In short, this study contributes to the literature in that it is the first study to investigate how the credit rating for Chaebol affiliated firms is determined.

의결권 최대화를 목적으로 하는 순환출자 해소 휴리스틱 방법

박찬규(Chan-Kyoo Park) 한국경영과학회 2014 韓國經營科學會誌 Vol.39 No.4

Circular shareholding refers to a situation where at least three member firms in a business group have stock in other member firms and establish a series of ownership in a circular way. Although many studies have focused on the ultimate effect of circular shareholding on firm"s value and profitability, there have been few studies which address how to resolve circular shareholding from the perspective of optimization theory. This paper proposes a heuristic method for identifying shareholdings which need to be cleared in order to settle the problem of circular shareholding in a business group. The proposed heuristic tries to maximize the sum of voting rights the controlling family has in its business group firms. The applications results confirm that the heuristic provides near-optimal solutions for most of 16 Korean large business groups involving circular shareholding.

기업지배구조가 공급사슬 효율성에 미치는 영향 : 자기주식 취득, 소유지배 괴리와 재고회전율을 중심으로

박찬규(Chan-Kyoo Park) 한국생산관리학회 2015 한국생산관리학회지 Vol.26 No.3

기업지배구조에 관한 많은 연구에서 지배구조는 기업성과나 가치를 결정하는 중요한 요소임을 보이고 있다. 특히 소유와 지배의 괴리가 클수록 지배주주의 사적 이익 추구 가능성이 증가하여 기업성과가 하락하고 나아가 기업 혁신활동이 저해됨을 보이고 있다. 반면 운영관리 분야에서는 지배구조를 고려한 연구가 매우 제한적으로 이루어져 왔다. 본 연구는 제조기업의 자기주식 취득과 같은 지배구조의 변화가 소유지배 괴리에 미치는 영향을 분석하고 나아가 소유지배 괴리가 공급사슬 성과와 상관성이 있는지를 분석하고자 한다. 본 연구는 먼저 수리분석과 수치실험을 통해 자기주식 취득이 소유지배 괴리를 확대함을 증명한다. 이때 소유권은 배당금에 대한 권리를 의미하며 지배권은 의사결정에 참여할 수 있는 권리를 말한다. 소유권과 지배권의 여러 가지 정의 하에서 자기주식이 소유권과 지배권에 미치는 영향, 나아가 소유지배 괴리에 미치는 영향을 수리적으로 분석한다. 다음으로 우리나라 주식시장에 상장된 제조기업을 대상으로 회귀분석을 실시하여 소유지배 괴리와 재고회전율 간의 관련성을 확인한다. 회귀분석 결과 소유지배 괴리는 재고회전율과 음(-)의 상관관계를 보이는 것으로 나타났다. 이는 자기주식 취득은 소유지배 괴리를 확대시키고 궁극적으로 공급사슬 성과에도 부정적인 영향을 미칠 수 있음을 시사한다. Much of the literature has shown that corporate governance plays a significant role in determining firm performance. Especially, the discrepancy between ownership and control (ownership-control discrepancy) can give controlling families more opportunities of pursuing its private interest at the expense of minority shareholders, leading to a negative effect on firm's performance. Operations management field has not incorporated corporate governance into the model for explaining supply chain efficiency. This study is concerned with what impact share repurchase, one way to change firm’s shareholding structure, has on ownership-control discrepancy and eventually supply chain performance. Using a mathematical analysis and numerical experiments, this paper shows that share repurchase intensifies the ownership-control discrepancy under the assumption that the ownership rights is defined to be the controlling family's direct stake while the control rights is defined to be the sum of the controlling family's direct stake and group-affiliated firms' stakes. Moreover, to analyze the impact of ownership-control discrepancy on supply chain performance, the regression model is constructed in which inventory turnover is the dependent variable and ownership-control discrepancy is an independent variable. The results from the regression model show that inventory turnovers of listed manufacturing companies in Korean stock markets are negatively correlated with ownership-control discrepancy. In conclusion, share repurchase aggravates the ownership-control discrepancy, eventually resulting in negative supply chain performance. Our study will give a new perspective for investigating the effect of share repurchase on supply chain performance.

소프트웨어 개발비 기준의 애플리케이션 유형과 품질 및 특성 보정요소 개선

박찬규(Chan-Kyoo Park),김우제(Woo-Je Kim),서용원(Yong-Won Seo) 한국IT서비스학회 2009 한국IT서비스학회지 Vol.8 No.2

As software development and maintenance cost increase quickly, information systems managers are more concerned about how to effectively manage software cost. To estimate the software development cost, most public institutes of Korea use the software cost estimation standard established by the government. Unfortunately, the accuracy of the estimation derived from the standard has standard has not been satisfactory in spite of repetitive modifications made to improve it. One of the major reasons for the inaccuracy is that the standard has too small a number of cost adjustment factors to reflect the various characteristics of a software development project. To remedy this problem, we propose new cost adjustment factors which can be incorporated into the standard and are important to enhance the estimation accuracy, based on the analysis of several well-known software estimation models. Furthermore, by applying the proposed model to real world software projects, we show that the proposed model can produce more accurate estimates than the current standard.