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심증수,김엽래,서성원 서울産業大學校 1992 논문집 Vol.35 No.1
In the case of cast gears, the dimensions of various parts of gear bodies are mostly designed on the basic of empirical data. However, for plastic gears, such empirical design data are few; accordingly, even though he indicated transmitting power is the same, large difference is observed in the thickness of gear bodies and others among different to manufacturers. Therefore, in the study, as one procedure of examining the effect of the difference in the thickness of gear bodies such as these on the operation of the plastic gears for transmitting power, operation tests were carried out by using various thicknesses of disks and of rims in disk type plastic gears, and the relationships of the change of these thicknesses with life, wear, change of tooth profile and the other characteristics of plastic gears were examine.
徐成源 서울産業大學校 1987 논문집 Vol.26 No.1
The fatigue life prediction of butt welded joint at weld toes was studied in many papers. this paper is studied the fatigue crack initiation life depended on the weld toe configuration and the effect of stress concentration at the weld toes was estimated by a local strain with the scatter of the stress concentration factor. The results of this paper as follows. 1. The fatigue cracks 0.5-1.0mm at the weld toes grew fast under the stress concentration. 2. The propagation life of cracks more than 0.5-1.0mm was not affected by the weld toes and hardly depended on the weld toe configuration. 3. The fatigue crack propagation life can be estimated by the linear fracture mechanics analysis based on the assumption of the initial crack depth of the initial crack depth of 0.5-1.0mm at the weld toes.
서성원 강원대학교 경영경제연구소 2024 Asia-Pacific Journal of Business Vol.15 No.1
Purpose - In this study, we propose an empirical model for predicting seasoned equity offering (SEO here after) using machine learning methods. Design/methodology/approach - The models utilize the random forest method based on decision trees that considers non-linear relationships, as well as the gradient boosting tree model. SEOs incur significant direct and indirect costs. Therefore, CEOs’ decisions of seasoned equity issuances are made only when the benefits outweigh the costs, which leads to a non-linear relationship between SEOs and a determinant of them. Particularly, a variable related to market timing effectively exhibit such non-linear relations. Findings - To account for these non-linear relationships, we hypothesize that decision tree-based random forest and gradient boosting tree models are more suitable than the linear methodologies due to the non-linear relations. The results of this study support this hypothesis. Research implications or Originality - We expect that our findings can provide meaningful information to investors and policy makers by classifying companies to undergo SEOs.
Institutional Investors and Financial Crisis
서성원,신승훈 성균관대학교 경영연구소 2016 자산운용연구 Vol.4 No.1
We find that characteristics of stocks owned by institutional investors are changed after the 2007-2008 financial crisis, by analyzing institutional investors that have been reported on the filings of SEC’s Form 13F from 2005 to 2011. We find that before the crisis institutional investors prefer stocks with low past volatility. However, we find no such patterns or even opposite patterns after the crisis. Consistent with previous literature, we confirm they consistently have a strong preference for large, liquid, and under-valued stocks before and after the crisis. However, we find that this preference is statistically weak in the middle of financial crisis.
서성원 명지대학교 정부행정연구센터 2001 정부행정 Vol.2 No.
본 연구는 세계화·정보화 및 탈 이데올로기의 변화속에서 국가경쟁력을 증진시키기 위한 행정체제를 구축하기 위해서는 정부행정의 규모확대에서 찾는 것이 아니라 오히려 정부행정의 비효율적 부분의 대폭적인 축소를 통해 이루어져야한다는 인식하에 공기업의 민영화에 대한 당위성과 그 추진현황을 조망해보는데 목적이 있다. 우리 나라의 공기업은 일찍이 경제성장의 중심축으로 형성되고 경제성장의 견인차 역할을 한 것이 사실이나 점점 경제여건의 변화와 공기업 체제의 문제점들의 노정은 마침내 공기업의 민영화를 불가피한 과제로 추진하게 되었다. 따라서 본 연구에서는 공기업 민영화의 절차와 방법, 공기업 민영화의 효과와 성공조건을 이론적 기반위에서 검토하고 우리 나라 공기업의 민영화 추진현황을 그 동안 시행된 다섯 차례의 민영화 추진정책을 개관하였다.