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조성빈 ( Cho¸ Sungbin ) 한국경영공학회 2020 한국경영공학회지 Vol.25 No.4
Purpose This study analyzes small- and medium-sized manufacturing corporations' bankruptcy problem based on financial ratio variables. The analysis is done using Decision Tree model, Random Forest model, and Gradient Boosting model. Model performance is evaluated with correct classification rate, false negative rate, and false positive rate. Methods Both decision tree ensemble models outperform basic decision tree model in terms of correct classification rate. Gradient Boosting model is more consistent in prediction than Random Forest model. Regarding false negative rate, Random Forest model produces least error and Gradient Boosting model is second best with higher consistency. Results Mean decrease accuracy index resulted from Random Forest model indicates that important input variables are ordered as net profit over sales revenue, sales over financial expenses, total equity over net working capital, and turnover rate of management assets. Influential input variables are turned out, in order, to be net profit over sales revenue, total equity over net working capital, sales over financial expenses, and operating profit over sales revenue, according to mean decrease gini. Conclusion Based on the study findings, this study insists that manufacturing corporations should continuously monitor the change in financial ratio variables that are identified important antecedents for bankruptcy possibility.
Disclosure and Stock Market Reactions to Earnings Management
Chun, Sungbin,Kim, Yongtae 서강대학교 경영학연구원 2004 서강경영논총 Vol.15 No.1
Using a sample of US seasoned equity offerings, we examine whether a firm's disclosure strategy affects investors' ability to identify earnings management. The results are consistent with an increase in disclosure activity shortly before the offering announcement being designed to hamper investors' ability to recognize earnings management. Moreover, firms increasing disclosure activity are in successful in delaying the reversal of accruals and misleading the market for over a year after SEOs. As to the level of disclosure activity maintained before offerings, the evidence indicates that investors believe incentive for earnings management is minimal with the high level of disclosure activity maintained.
Deconfinement and hidden phases of U(1) quantum spin liquids
SungBin Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Quantum spin liquids are one of the most intriguing phenomena with emergent gauge structures and fractionalized excitations. Here, we first revisit the mapping between spin-1/2 Hamiltonian and U(1) lattice gauge theory and discuss the rigorous argument for quantum deconfinement. Then we discuss how such emergent gauge fields and fractionalized particles can be controlled under the lattice strain effect and external magnetic field. In particular focusing on a U(1) quantum spin liquid, we argue possible frustration in gauge fields and large thermal Hall effect as a signal of such frustration. In addition, we develop a new formalism which leads a proper description of intermediate range in between deconfined quantum spin liquids and confined ordered phases. For a U(1) quantum spin liquid, particularly, we show it can give birth to abundant daughter phases such as a (charged-)Z_2 spin liquid and a super solid without need for fine-tuning of parameters. These results are of broad relevance to quantum spin liquids subject to a parton description and offer a new perspective for searching exotic hidden phases in quantum magnets.
Sungbin Won 동중앙아시아경상학회 2016 동중앙아시아연구 Vol.27 No.3
본 연구에서는 동중앙 아시아, 유럽 및 미국 대륙의 15개 국가 해외 소비자들의 문화적 특성이 한국 제품에 대한 구매의도에 미치는 영향을 분석하고자 한다. 문화적 특성은 SVS에서 제안된 10개의 인간 본연의 가치를 통한 국가 적 차원과 소비자 세계주의, 자민족주의, 그리고 한국에 대한 국가이미지를 통한 개인적 차원에 대한 다층모형분석을 실시하였다. 한국 제품에 대한 구매의도는 6개 제품군에 대한 구매의도를 개별적으로 분석하였다. 분석결과 국가적 문화변수들에 대한 결과는 제품군 별로 차이를 보였으나, 유의한 영향력의 정(+) 또는 부(-)를 나타내는 방향성 면에 서 일관적인 패턴을 형성하였다. 개인 차원의 변수들에 대한 분석결과 소비자 세계주의 및 한국 이미지의 경우 기존 문헌들에서 주장한 바와 일치하는 정(+)의 유의한 영향력을 보였으나, 자민족주의의 경우 일부 제품군에서 예상과는 반대로 한국 제품에 대한 구매의도에 대한 정(+)의 영향력을 나타내어 향후 지속 연구의 필요성을 나타내었다. The purpose of this research is to empirically investigate the effect of consumer's cultural tendency on purchase intention towards various categories of foreign product within national and individual levels using data of 15 nations from East and Central Asian, European, and American continents. 10 variables from SVS, and consumer cosmopolitanism(COS), consumer ethnocentrism(CET) and Korean country image have been taken as national and individual level cultural variables. Multi-level analysis on those variables was conducted to explore the dynamic relationship in research model. The findings show that the result for national culture variables are category sensitive, however consistent pattern in terms of positive or negative directions of significant effect. For individual level variables, COS and country image show positive and significant result. CET shows unlikely positive and significant result towards a part of 6 Korean product categories.
Integrative Analysis on Service Quality and User Satisfaction of Wired and Mobile Internet
Sungbin Cho,Minje Sung 한국경영과학회 2007 Management Science and Financial Engineering Vol.13 No.2
This paper investigates the relationship of service quality and user satisfaction in the wired and mobile Internet services based on the integrative framework of both systems. Given a moderate level of reliability and validity, the commonly driven dimensions for measuring service quality include responsiveness, assurance, empathy, convenience, usefulness, and diversity. User satisfaction is measurable by the dimensions of communication/entertainment, finance/economics, location/geography, and information/consulting. We apply the MANOVA tests to evaluate whether each of the service quality dimensions has an overall influence on user satisfaction. Next, multiple regression analyses are conducted to check if unique positive effect exists between each combination of service quality dimensions and user satisfaction dimensions. The results show that service quality must be taken care of with respect to the assurance dimension in order to enhance customer satisfaction in the dimensions of location/geography, which will contribute to increasing the utilization of mobile service. For improving user satisfaction in the dimension of information/consulting, service quality must be supported with respect to assurance and empathy in the mobile Internet market, in addition to diversity, which is the only significant service quality in the wired Internet service.