본태성 고혈압과 동반된 속발성 피부 홍통증 2예

조성빈 ( Sung Bin Cho ),김형수 ( Hyung Su Kim ),신호식 ( Ho Sik Shin ),권연숙 ( Yeon Sook Kwon ),오상호 ( Sang Ho Oh ),이주희 ( Ju Hee Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.4

Erythromelalgia is a rare clinical syndrome characterized by redness and painful episodes of the feet and hands, which is triggered by heat or exercise. A 22-year-old male soldier presented with paroxysmal redness of the both feet associated with pain and tenderness upon heat stimulation, including wearing military shoes for periods of over 30 minutes. He had been treated of essential hypertension with dichlorothiazide and had a familial medical history of essential hypertension with his mother and brother. A 21-year-old male soldier also presented with paroxysmal redness of both feet and hands associated with pain and tenderness upon heat stimulation. By searching for the underlying or combined diseases of the erythromelalgia, he was also found to have essential hypertension. Herein, we report two cases of secondary erythromelalgia associated with essential hypertension. (Korean J Dermatol 2008;46(4):517~519)

마이크로 유전알고리즘을 이용한 사출성형품의 게이트 위치 최적화

조성빈(Sung-Bin Cho),박창현(Chang-Hyun Park),표병기(Byung-Gi Pyo),이병옥(Byung-Ohk Rhee),최동훈(Dong-Hoon Choi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5

A design problem was formulated to minimize the injection pressure while preventing weldlines. To solve this design problem, we integrated MAPS-3D (Mold Analysis and Plastic Solution-3Dimension), a commercial injection molding analysis CAE tool, using the file parsing method of PIAnO (Process Integration, Automation and Optimization) as a commercial PIDO (Process Integration and Design Optimization) tool. Then, we used micro GA (Genetic Algorithm) equipped in PIAnO. Using the proposed design approach, the injection pressure has been reduced compared to the initial one while satisfying the design constraint. This design result clearly shows the validity of the proposed design approach.

표피낭종이 동반된 진피내 모반 1예

조성빈 ( Sung Bin Cho ),안봉균 ( Bong Kyun Ahn ),정진영 ( Jin Young Jung ),오상호 ( Sang Ho Oh ) 大韓皮膚科學會 2008 大韓皮膚科學會誌 Vol.46 No.7

판매보수의 펀드투자자금과 투자성과에 대한 영향

조성빈 ( Sung Bin Cho ),신인석 ( In Seok Shin ) 한국금융연구원 2012 금융연구 Vol.26 No.1

As the fund industry emerges as an important saving channel for retail investors, the ``cost`` of fund investment has attracted public attention. In particular, sales fees, which are the largest portion of the total cost of fund investment in Korea, have been a focal point of policy debate. A Critical view argues that sales fees are more of a cost factor to final investors and produce a negative effect on fund performance. This seems to be a prevailing view in Korea, as indicated by a recent regulation that imposed a ceiling on sales fees. In contrast, there are arguments advocating sales fees, which were developed in the US during the 1980s as a response to the 12b-1 fee. The original justification for the plans, as put forth by the US mutual fund industry in the 1970s, was that such fees help attract new investors into funds through advertising and by providing incentives for brokers to market the fund. Arguably, asset growth from any means benefits shareholders through economies of scale in management expenses and lower flow volatility, which decreases liquidity costs for the fund. While public attention and policy debate on sales fees abound, academic studies of the issue remain rare even in the US partly due to lack of the data. Recently, researchers examined the relationship between the 12b-1fee and fund flows, and reported that the 12b-1 fee increased fund flows (Barber, Odean, and Zheng 2005; Bergstresser, Chalmers and Tufano 2009). In this paper, we empirically examine the associations among sales fees, fund flows, and fund performances using Korean monthly fund data from 2002 to 2010. We obtained the following findings: (1) the positive effect of sales fees on fund flows exists only when the fund underperforms the market; (2) sales fees have significant positive relations with the performance of funds evaluated on a gross return basis (before netting expenses), but not with the performance of funds evaluated on a net return basis (after netting expenses); (3) in a sample of above-median-sized funds that were at least 1 year old after, sales fees had a significantly negative effect on fund performance on a net return basis. These empirical findings suggest that sales fees do not work for the benefits of investors. It is notable that some of the regression results are different from previous US studies. In risk factors measured by standard deviations of past returns, fund sizes are found positively related to fund flows, marking a contrast with US findings. Importantly, the finding that sales fees have no significant relationship with fund flows is also inconsistent with the US studies. These differences between the two counties could be simply a reflection of different stages of industry development. But a more interesting possibility is that cognitive biases of fund investors may differ between the two countries due to institutional differences. For example, sales fees may be a ``hidden cost`` to US investors as they are only a small portion of the sales cost; this may not be so for Korean investors since sales fees are the major form of sales cost and have received wide media attention. Explaining the different empirical findings between Korea and the US, while considering the possibility of behavioral biases, could be an interesting future research agenda.

주식형 펀드의 위탁매매비용

조성빈 ( Sung Bin Cho ) 한국금융연구원 2014 금융연구 Vol.28 No.1

In Korea, the fund industry has grown at a fast pace since 2000, which are driven by equity funds held by individual investors. Since the asset management market has a typical structure of producing agency problems due to its separation of ownership (investors) from control (asset management firms), it is necessary to effectively control those problems in order to protect investors during the expansion process of the indirect investment market as mentioned above. In particular, considering Korea`s current conditions in which many asset management companies have subsidiary relationship with vendors and that a multiple number of funds are managed by the same company, it is very significant to grasp the consequences of agency costs of equity funds and the strategic behaviors of management companies as well as to streamline institutional mechanism for the investor protection. In discussing the agency problems in equity funds, costs of investment grap the attentions among researchers. That is, the growing body of the literature has paid attention to the cost of fund investment in Korea. The previous literature has focused on the pre-specified and visible costs of investment such as sales fee and/or management fees and little is known about the brokerage commission, a hidden and invisible cost of fund investment. Analyzing the impact of brokerage commission on the interest of investors would be of great significance in handling conflict of interest between management firms and investors, considering that investors under asymmetric information face limitations in monitoring and controlling their funds managed by a management firm. In other words, brokerage commission is a fee charged by a broker (firm) in managing funds entrusted to them by investors. However, these management activities sidestep direct control and monitoring leading to an agency problem. Hence, there is a significant implication for understanding conflict of interest between investors and management firms and streamlining the system to protect investors. This study investigates the trading patterns of the equity funds and analyzes the relationships between brokerage commission and characteristics of funds, and between brokerage commission and return on funds, using the data on equity funds of Korea from 2010:2Q to 2011:4Q. The main empirical findings of the paper can be summarized as follows. Equity funds concentrate their trading with a small set of brokers, which is more prevalent with smaller funds. In addition, brokerage commission rates are found to be negatively related to trading volume but turnover ratio does not have a statistically significant relationship with the size of trading. The fund-level analysis shows a statistically significant positive relationship between turnover and brokerage commission, meaning that brokerage commissions are driven by trade volume rather than commission rates. Meanwhile, the analysis on the relationship between brokerage commission and return on funds reveals that higher brokerage commissions lead to lower return on funds, meaning at least in short-term trading does not make no contribution to increasing returns in the future. These results suggest the need for disclosures of brokerage commissions that are hidden costs to investors, which would enable investors to make more informed decision and to control conflict of interest between investors and management firms.

고령화사회에 따른 생명보험사의 마케팅 전략

조성빈 ( Sung Bin Cho ),이훈 ( Hoon Lee ) 서강대학교 경영학연구원 2006 서강경영논총 Vol.17 No.2

의사결정나무 추론을 이용한 공급사슬에서 무형자산의 시너지효과 분석

조성빈 ( Sung Bin Cho ),정가혜 ( Ga Hye Jung ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.2

This study attempts to analyze the synergistic effect of intangible assets on logistics efficiency in supply chains. Intangible assets are measured by investment in relationship, reduced control, knowledge/skill confidence, knowledge/skill link, reduction in opportunism, information sharing, benefit/risk sharing, decision sharing, which reflect the aspects of trust, commitment, and collaboration. Logistic efficiency is measured by order fulfillment, lead time, production flexibility, inventory turnover, overall cost, and backorder cost, which reflect the aspects of time, responsiveness, and cost. Unlike most former studies in SCM, we view trust between individual managers in supplier and buyer firms, and evaluate suppliers` trust on buyers, because suppliers can better observe supply chain processes and try to solve efficiency problems. Decision tree induction is adopted to analyze the interaction between independent variables and to figure out how these variables must be joined to give an effect on performance. The analysis results indicate that investment in relationship is the most influential variable in explaining the performance in all three aspects of supply chains. Secondary variables that give synergistic effect by combining with affective trust such as investment in relationship include collaboration variables such as decision sharing, benefit/risk sharing, and information sharing.

비의료인에 의한 불법 의료행위로 인한 부작용 사례 분석

조성빈 ( Sung Bin Cho ),이상주 ( Sang Ju Lee ),심재홍 ( Jae Hong Shim ),김동현 ( Dong Hyun Kim ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.11

Background: Cases of patients presenting side effects after illegal therapeutic attempts by non-medical personnel have been increasing and the patterns of attempts and related side effects become complicated. Objective: To analyze the causes and characteristics of illegal therapeutic attempts and its` side effects performed by non-medical personnel. Methods: Between April 1, 2008 and April 30, 2008, a total of 120 case reports of patients who developed side effects after illegal therapeutic attempts by non-medical personnel were collected from the members of the Korean dermatological association and analyzed. Results: Clinical diagnoses, suggested to have before receiving illegal therapeutic attempts, revealed that 44 (36.6%) patients presented various pigmentary disorders, such as acquired melanocytic nevi and melasma, 22 (18.3%) wanted to have tattooing for permanent make up, skin aging in 16 (13.3%) cases, and acne in 10 (8.3%). Illegal therapeutic attempts performed included tattooing for permanent make up in 22 (18.3%) cases, peelings 19 (15.8%), laser therapies 18 (15.0%), and filler injection 12 (10.0%). The various clinical diagnoses of the patients with side effects were suggested, such as contact dermatitis in 34 (25.6%) cases, scarring in 33 (24.8%), post-inflammatory hyperpigmentation 20 (15.0%), secondary infection 19 (14.3%), and acne or acneiform eruption 9 (6.8%). Conclusion: In this report, we demonstrated patterns of illegal therapeutic attempts by non-medical personnel and its` side effects. We suggest that more effort should be followed by dermatologists to inform patients the risks of the illegal therapeutic attempts by non-medical personnel and to increase public health awareness. (Korean J Dermatol 2008; 46(11): 1507∼1512)

Clinical application of invasive microneedle radiofrequency system

조성빈 ( Sung Bin Cho ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2

도심 환경에서 NLI Table 을 활용한 VANET 라우팅 Scheme 에 대한 연구

조성빈(Cho Sung-bin),이상선(Lee Sang Sun) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.1