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김학민,강동일,심봉석,민권식 대한비뇨의학회 2010 Investigative and Clinical Urology Vol.51 No.12
Purpose: The clinical usefulness of hyaluronic acid (HA) instillation during visual internal urethrotomy (VIU) for decreasing the incidence of recurrent urethral stricture was assessed. Materials and Methods: Twenty-eight patients were treated by VIU with HA instillation between May 2007 and June 2009. After insertion of a Foley catheter following urethrotomy, HA was instilled via an 18-gauge tube catheter between the urethral lumen and Foley catheter. Seventeen cases were analyzed retrospectively 12 months postoperatively. We evaluated the success rate of this procedure by comparing retrograde urethrography (RGU) results, maximum flow rates, and postvoid residual urine volumes preoperatively and 3 and 12 months postoperatively. Success was defined as either a maximum flow rate of at least 15 ml/s or no visible urethral stricture on RGU at 12 months postoperatively. Results: Total success rates were 76.5% (13/17) and 52.9% (9/17) at 3 and 12 months postoperatively, respectively. By etiology, success rates at 3 and 12 months postoperatively, respectively, were 66.7% and 33.3% for inflammation, 66.7% and 50.0% for trauma, and 83.3% and 66.7% for unknown causes. Success rates were 63.6% for strictures less than 10 mm in length and 33.3% for strictures of 10 mm or more in length at 12 months postoperatively. Success rates were 61.5% for single strictures and 25% for multiple strictures at 12 months postoperatively. Conclusions: The success rate of VIU with HA instillation was not better than that observed in the literature for conventional VIU. Purpose: The clinical usefulness of hyaluronic acid (HA) instillation during visual internal urethrotomy (VIU) for decreasing the incidence of recurrent urethral stricture was assessed. Materials and Methods: Twenty-eight patients were treated by VIU with HA instillation between May 2007 and June 2009. After insertion of a Foley catheter following urethrotomy, HA was instilled via an 18-gauge tube catheter between the urethral lumen and Foley catheter. Seventeen cases were analyzed retrospectively 12 months postoperatively. We evaluated the success rate of this procedure by comparing retrograde urethrography (RGU) results, maximum flow rates, and postvoid residual urine volumes preoperatively and 3 and 12 months postoperatively. Success was defined as either a maximum flow rate of at least 15 ml/s or no visible urethral stricture on RGU at 12 months postoperatively. Results: Total success rates were 76.5% (13/17) and 52.9% (9/17) at 3 and 12 months postoperatively, respectively. By etiology, success rates at 3 and 12 months postoperatively, respectively, were 66.7% and 33.3% for inflammation, 66.7% and 50.0% for trauma, and 83.3% and 66.7% for unknown causes. Success rates were 63.6% for strictures less than 10 mm in length and 33.3% for strictures of 10 mm or more in length at 12 months postoperatively. Success rates were 61.5% for single strictures and 25% for multiple strictures at 12 months postoperatively. Conclusions: The success rate of VIU with HA instillation was not better than that observed in the literature for conventional VIU.
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Factors Determining e-Trade Performance Based on Transaction Cost Theory: The Case of South Korea
김학민,이호형 한국무역학회 2009 Journal of Korea trade Vol.13 No.1
Countries worldwide have been actively investing in building up global e-trade infrastructure for international transactions such as those of goods, services, and money. Such investments have facilitated business firms’ making greater use of e-trade systems and improving their management performance. The objective of this paper is to review the mechanics of how e-trade practices can affect a firm’s performance. It is well known that the introduction of e-trade systems can decrease transaction costs at the macro level, because in many cases, data sets are compiled from a collection of individual transactions. However, this review attempts to determine whether trade transaction costs influence exporting firms’ performance at the firm level. A theoretical framework is suggested for determining the usage and performance of global e-trade. An empirical analysis of South Korean exporting firms has been undertaken. This paper concludes that e-trade has yet to overcome the barriers resulting from transaction costs, and that it is therefore very important to increase both organizational information and global capabilities. In this regard, appropriate actions such as intensive education and training programs should be implemented in order to make South Korea's e-trade mature.
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Asset specificity and capability of e-Trade performance: evidence from Korea
김학민,이호형 한국무역학회 2016 Journal of Korea trade Vol.20 No.1
Purpose – E-Trade (paperless trade or cross-border e-commerce in B2B format) does not necessarily show positive results. The purpose of this paper is to conceptualize why and how such happens and furthermore, has two research purposes. First is to explain why studies in e-Trade performance show controversial results, such as some showing positive while others are not. Second is to investigate the relationship among research constructs such as e-Trade benefits, e-Trade use, asset specificity, and exporting firm’s capability. Design/methodology/approach – This study considers multiple dimensions and evolutionary perspective of e-Trade performance. Structural equation model adopts the measures of firm’s capability, e-Trade use, and benefits to analyze e-Trade performance. Performance was divided into organizational net benefits (ONB) and industrial net benefits. Several hypotheses were suggested to test the relationship among the variables in the model. Basic moderator effect represented as an interaction between asset specificity and other constructs. In total, 295 exporting firms have participated in the survey and their responses were utilized for analysis. Findings – This study shows that e-Trade performance should consider maturity as well as multiple stages among constructs. Critical paths were found among capability factors, process use (PU), ONB, and asset specificity. Results also show that information capability and marketing capability (MC) are determinant factors on e-Trade performance. In addition, MC and level of PU are read to be determinant factors of ONB. Furthermore, small and medium-sized enterprises’ (SMEs’) asset specificity, with level of capability and e-Trade use moderates their e-Trade performance. Research limitations/implications – Asset specificity of SMEs has to be managed in a positive direction. Government’s e-Trade supporting programs for SMEs should be transformed in a way that can foster the growth of capability and self-sustainment. It reads to be inevitable to amend the current characteristics of e-Trade services. Furthermore, developing a specialized e-Trade service for large firms will also be in need. And utilizing exporting firm’s financial data would be more advisable testing the hypotheses. Originality/value – Most works in information system as well as in e-Trade area report controversial performance results and this paper suggests an alternative model by combining asset specificity into capability and e-Trade use. Study on e-Trade performance is complicated and needs to consider multiple dimensions as well as their stages. This study envisions firm’s capability, asset specificity and at the same time contributes in e-Trade benefits.
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