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        • KCI등재

          A Filtering Strategy for Improving Charateristics-Based Portfolios

          서상원 중앙대학교 경제연구소 2021 Journal of Economic Development Vol.46 No.2

          In this paper, we propose new indexes to measure the predictive power for future returns possessed by firm characteristics and find that the predictive power significantly differs across the cross-section of assets. We also propose a filtering strategy to improve conventional characteristics-based portfolio profits. The new strategy filters out assets with low predictive power. We apply the new strategy to equity data and find that it significantly outperforms the conventional strategy for several well-known firm characteristics. We also find that characteristics-based portfolio profits are not prevalent but rather driven by only a small subset of stocks.

        • KCI등재

          동종유래각질세포(Cultured Allogenic Keratinocytes, Kaloderm<sup>®</sup>)를 이용한 부분층 피부 결손의 치료

          서상원,장충현,조민수,홍윤기,전세화,Seo, Sang Won,Chang, Choong Hyun,Cho, Min Su,Hong, Yoon Gi,Jeon, Sae Wha 대한외상학회 2007 大韓外傷學會誌 Vol.20 No.1

          Purpose: Grafting with autograft skin remains the most effective method for treating skin defects. When insufficient donor sites are present or patients are afraid of the operation, a skin graft is impossible. Cultured allogenic keratinocytes speed wound healing by providing cover and by producing growth factors and extracellular matrix protein. We report an application of cultured allogenic keratinocytes ($Kaloderm^{(R)}$, Tegoscience, Seoul, Korea) in the treatment of an acute partial thickness skin defect. Methods: From March 2005 to January 2006, 20 patients with a partial thickness skin defect were treated with cultured allogenic keratinocytes. The wound was covered with a sheet of cultured allogenic keratinocytes and ointment with $Bactigras^{(R)}$ gauze. The wound was inspected every two or three days. We regarded completion of epithelialization as wound healing. Results: The mean period between time of injury and time of $Kaloderm^{(R)}$ application was 7.5 days. The time taken from application of $Kaloderm^{(R)}$ to complete closure of the wounds was 7.2 days. Conclusion: In view of the favorable outcome, cultured allogenic keratinocytes are safe and effective biologic dressing materials for use in the treatment of open wounds.

        • 가계부채의 부실위험성 예측 및 평가: 가구자료를 활용한 지역별 분석

          서상원,오권영 금융감독원 2016 금융감독연구 Vol.3 No.1

          A large number of previous studies on household credit risks have analyzed various aspects of the problem, but they have rarely attempted to forecast the risks. In this paper, we propose a new model to predict household credit risks which is designed for utilizing household survey data. We apply the model into real Korean household survey data and present its forecasting results for 2015~2017 as of year 2014. The forecasting results are provided not only for country-wide but also by region. The results illustrate that country-wide results significantly differ from those for individual regions, implying that regional analysis would be necessary for accurate regional forecasting. 가구별 조사자료를 활용하여 가계부채의 부실위험성을 분석한 기존의 연구들은 가계부채의 부실위험성에 대한 현황분석에 머무르고 예측에는 적합하지 못하다는 한계점이 있었다. 본 논문은 이러한 한계점을 극복하기 위해 가계부채의 부실위험성을 예측할 수 있는 모형들을 새로이 제시하고 우리나라의 실제 가구별 조사자료에 적용하여 2014년을 현재시점으로 2015~2017년을 예측시점으로하는 가계부채의 부실위험성을 예측한 결과를 제시하였다. 또한, 본 연구에서는 전국단위 뿐만 아니라 지역별로도 세분하여 가계부채의 부실위험성을 예측한 결과도 함께 제시하였다. 전국단위에서의 예측결과와 지역별 예측결과가 서로 차이를 보이는 경우가 많았는데, 이는 보다 적절한 지역별 예측을 위해서는 해당 지역에 대한 자료를 활용하는 지역단위 분석이 필요함을 시사한다.

        • KCI우수등재

          Cross-Reactivity of Porcine Immunoglobulin A Antibodies with Fecal Immunoglobulins of Wild Boar (Sus scrofa ) and Other Animal Species

          서상원,Sung J. Yoo,선우선영,현방훈,류영수 대한면역학회 2016 Immune Network Vol.16 No.3

          Fecal samples obtained from wild boar habitats are useful for the surveillance of diseases in wild boar populations; however, it is difficult to determine the species of origin of feces collected in natural habitats. In this study, a fecal IgA ELISA was evaluated as a method for identifying the porcine species from fecal samples. Both domestic pigs (Sus scrofa domestica ) and wild boars (Sus scrofa coreanus ) showed significantly higher levels of fecal IgA than other animal species. Additionally, age dependent changes in the level of Ig A in wild boars and domestic pigs were identified; Titers of Ig A were highest in suckling period and lowest in weanling period.

        • KCI등재

          암호화폐와 사회후생

          서상원 한국응용경제학회 2018 응용경제 Vol.20 No.4

          본 논문은 암호화폐가 사회후생에 미치는 영향을 이론모형을 통해 분석하였다. 암호화폐는 암호화폐 채굴노력을 필요로 하는데 반해, 자원배분의 효율성 개선효과는 없어서 사회후생을 감소시킨다. 특히, 암호화폐가 투기적 목적으로 사용되면 거래적 목적으로 사용되는 경우에 비해 사회후생의 감소폭이 더욱 커진다. 그리고 시뮬레이션을 이용한 정량적 분석결과, 새로운 암호화폐가 지속적으로 창출되고 빠르게 확산되면 그로 인한 미래의 사회후생 감소는 현재의 사회후생 감소수준보다 더 클 수 있을 것으로 나타났다. This paper examines the effects of cryptocurrencies on social welfare using a theoretical model. While cryptocurrencies do not improve efficiency in resource allocation, they require efforts in mining, which leads to reduce social welfare. Moreover, speculative holding of cryptocurrencies reduces social welfare further than transaction-motive holding of cryptocurrencies. Simulation results show that if new alt-coins will continuously and rapidly emerge in the future, a social welfare reduction could be larger in the future.

        • KCI등재후보

          알츠하이머병과 혈관성 치매의 치료와 예방 : 노인에서 인지기능장애의 평가와 치료

          서상원 대한임상노인의학회 2012 대한임상노인의학회지 Vol.13 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        • KCI등재

          중소기업 관계금융의 현황과 성과

          서상원,위경록 한국은행 2017 經濟分析 Vol.23 No.2

          In this paper, we empirically examines the effects of relationship banking on bank lending to small and medium-sized enterprises by using actual transaction-level bank lending data in Korea. We find that a stronger relationship banking leads to positive results by reducing lending rate and overdue loans. However, those positive effects are not sufficiently significant. To foster relationship banking in Korea, the Korean Financial Supervisory Service initiated a program called "the Relationship Banking Agreement"(RBA) between banks and small and medium-sized enterprises. Our bank loan data contain the information about the RBA. We empirically assess whether the RBA could yield positive effects on bank lending to small and medium-sized enterprises or not. We cannot statistically confirm the effects of the RBA on bank lending to small and medium-sized enterprises. Moreover, the RBA has been implemented in a way that is inconsistent with the original purpose of the policy. This result suggests that the relationship banking to small and medium-sized enterprises has not been full-fledged yet but needs to be developed further in Korea. 본 논문은 은행의 중소기업에 대한 실제 건별 대출자료를 이용하여 우리나라 중소기업의 관계금융 현황과 성과를 분석하였다. 분석 결과, 우리나라의 중소기업 관계금융의 현황을 전통적인 관계금융 관련변수로 판단할 때 관계금융이 강할수록 대출금리, 대출 연체 등 중소기업 대출의 조건과 결과에 대체로 긍정적 영향이 존재하였으나, 금융감독원에서 시행한「관계형금융」제도의 효과를 통계적으로 확인하기 어려웠다. 이러한 결과들은 우리나라 중소기업에 대한 관계금융이 아직은 충분히 활성화되지 못하고 있으며 앞으로 더욱 활성화될 필요가 있음을 시사한다.

        • 흰쥐에서 배측 봉선핵의 전기자극이 췌장의 외분비기능에 미치는 영향

          서상원,박형진,Suh, Sang-Won,Park, Hyoung-Jin 대한생리학회 1990 대한생리학회지 Vol.24 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          The present investigation was performed to see a possible influence of the dorsal raphe nucleus (DRN) on pancreatic exocrine secretion in anesthetized rats since the DRN had been known to exert a regulatory mechanism on sympathetic activity which was known to be very important for pancreatic exocrine secretion, particularly in rats. Twenty-nine Sprague-Dawley rats fasted for 24 hours were anesthetized by i.p. injection of 1 g/kg of urethane. The pancreatic duct was cannulated to collect pancreatic juice while bile juice was diverted into the jejunum. The duodenopyloric junction was tightly ligated. After surgery for collection of pancreatic exocrine secretion and recording of carotid blood pressure, a coaxial electrode was stereotaxically inserted in the DRN with a guide of a brain atlas. And then, electrical stimulus of biphasic square wave with 2 v, 2 msec, 40 Hz was applied on the electrode for 10 minutes. Pancreatic volume flow and protein output secreted in 10 min were measured. Either bilateral cervical vagotomy or spinal cord transection at the level of $C4{\sim}C5$ was performed 20 min prior to stimulation of the DRN. 1) Electrical stimulation of the DRN resulted in significant (p<0.05) increase in pancreatic volume flow and protein output. These stimulatory effects were not affected by cervical vagotomy but completely abolished by cervical cord transection. 2) Electrical stimulation of the DRN also resulted in significant (p<0.05) rise of blood pressure of the carotid artery. The hypertensive effect was not affected by cervical vagotomy but completely abolished by cervical cord transection. The results strongly suggest that the DRN, a part of the central serotonergic system, could exert a stimulatory influence on pancreatic exocrine secretion by increasing the sympathetic activity in anesthetized rats.

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