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박성일,김일중,이신재,신민우,신원선,정용은,김경민,김만득,원종윤,이도연,최진섭,한광협 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.5
Objective: To evaluate the feasibility of angled cool-tip electrode for radiofrequency ablation of small superficial subcapsular liver tumors abutting abdominal wall, in order to traverse normal liver parenchyma, and thereby, obtain favorable configuration of ablation margin. Materials and Methods: In this study, we retrospectively analyzed 15 small superficial subcapsular liver tumors abutting abdominal wall in 15 patients, treated with radiofrequency ablation from March 2013 to June 2015 using a cool-tip electrode manually modified to create 25–35° angle at the junction between exposed and insulated segments. The tumors were hepatocellular carcinoma (n = 13) and metastases (n = 2: cholangiocellular carcinoma and rectosigmoid cancer), with maximum diameter of 10–26 mm (mean, 15.68 ± 5.29 mm). Under ultrasonographic guidance, the electrode tip was advanced to the depth of the tumors’ epicenter about 1 cm from the margin. The tip was re-directed to penetrate the tumor for radiofrequency ablation. Minimal ablation margin was measured at immediate post-treatment CT. Radiological images and medical records were evaluated for success rate, length of minimal ablation margin and complications. Results: Technical success rate of obtaining complete necrosis of the tumors was 100%, with no procedure-related complication. Minimal ablation margin ranged from 3–12 mm (mean, 7.07 ± 2.23 mm). CT/MRI follow-up at 21–1022 days (mean, 519.47 ± 304.51 days) revealed no local recurrence, but distant recurrence in 9 patients. Conclusion: Using an angled cool-tip electrode for radiofrequency ablation of small superficial subcapsular tumors abutting abdominal wall may be a feasible technique for obtaining adequate ablation margin and lower complication rate.
박성일,황영석,엄정섭 대한공간정보학회 2017 Spatial Information Research Vol.25 No.3
The principal advantage of OCO-2 satellite transect as a remote sensor is to provide, in a cost-effective manner, information required for narrow and long strip coverage, utilizing narrow view angle. Based on the postulated advantages of OCO-2 satellite transect for multiple nation-wide monitoring, a satellite transect sampling approach has been specifically proposed with focus on administrative region-wide monitoring. This research idea was formulated by incorporating the concept of typical satellite remote sensing into in situ transect techniques. The OCO-2 satellite transect was quite useful in in comparing CO2 concentrations among administrative regions in Northeast Asia and better understanding the nature and extent of carbon intensity that occurs in transect sampling points. This transect sampling survey made it possible to identify area-wide patterns of CO2 concentration changing trends subject to many different influences (e.g. the effects of specific sources of land use), which cannot be acquired by typical GHG monitoring satellite such as GOSAT. The OCO-2 satellite transects break down the usual concept of area-wide mapping established as a typical satellite survey technique. The study concludes that OCO-2 satellite transect is demonstrably suitable as a reliable information source for detecting sufficient ground detail CO2 concentrations, including administrative region monitoring.
외국 모기업 지분 전략과 국제합작투자 이사회 기능 및 효과성과의 관계에 관한 연구
박성일 서울대학교 국제학연구소 2018 국제지역연구 Vol.27 No.2
해외직접투자 진입방식 중에서 내부화 수단으로서 국제합작투자(International Joint Venture, IJV)의 전략적 선택과 또 다른 중요한 의사결정인 IJV 지분수준 결정은 상호보완적 관점에서 함께 이루어진다. 다국적기업의 IJV 지분수준 결정은 호스트 시장에서 기업특유(firm-specific) 입지우위 요소의 필요성 정도에 따라 결정된다. 하지만 하이브리드 조직인 IJV의 특성으로 인한 독특한 어려 움 때문에 IJV의 성공을 위해서는 사후적 거버넌스 메커니즘으로서의 IJV 이사회 역할이 중요하다. 본 연구의 목적은 외국 모기업 지분수준에 따른 IJV 이사회 기능의 차이와 IJV 이사회 활동-이 사회 효과성 관계에서의 공정성의 매개역할에 주는 영향(moderated mediation)을 분석하는 것이 다. 선진국으로부터 투자받은 국내 제조업 99개 IJV들을 대상으로 한 조사에서 외국 모기업 지분이 증가하면 IJV 이사회에서 통제기능과 조정기능 모두 강화되는 것으로 나타났다. 또한 외국 모기업 지분이 증가하면 IJV 이사회 활동–이사회 효과성 관계에서의 분배 공정성과 절차 공정성 인식에 의 한 매개효과가 증가한다는 것도 발견하였다. 반면 IJV 이사회 활동-이사회 효과성 관계에서의 상 호작용공정성의 매개효과는 외국 모기업 지분 수준차이가 영향을 주지 않았다. The strategic macro decision of choosing International Joint Ventures (‘IJV’) as a FDI entry mode for internalization should be made together with an additional important micro decision: determining the IJV ownership level. IJV ownership level depends on the extent to which the firm-specific advantage is needed. However, given that IJVs have inherent difficulties in management due to the characteristics of a hybrid organization, IJV board’s tasks as an ex post governance mechanism are critical for the success of IJV. The purpose of this study is to analyze the effect of the foreign parent’s equity level on the IJV board tasks and on the mediation role of justice in the relationship between IJV board tasks and board effectiveness. Based on surveys of CEOs of 99 IJVs in manufacturing sector in Korean, we found that when the foreign parent company is the controlling shareholder, the IJV board tasks have been greatly enhanced, especially in the strategic control areas such as long-term strategy formulation and short-term budget approval. In addition, we found that as foreign parent’s ownership in IJVs increases, the mediation effect of both the distributive justice and procedural justice on the relationship between IJV board tasks and the board effectiveness increases. In the meantime, indirect effect of interactional justice on the relationship between IJV board tasks and board effectiveness remains unchanged regardless of the level of foreign parent’s ownership in IJVs.
박성일 한국항해항만학회 2012 한국항해항만학회 학술대회논문집 Vol.2012 No.추계
선박의 길잡이 역할을 하고 있는 항로표지는 해상에서 서식하고 있는 갈매기, 가마우지 등 조류의 좋은 쉼터가 되고 있다. 해상의 조류는 이러한 쉼터에서 먹잇감을 찾거나 배설을 하는 습성이 있으며, 이는 항로표지 기능을 지해하는 문제점을 낳고 있다. 이러한 문제점을 해소하기 위하여 우리나라뿐만 아니라 세계 각국에서는 수년간 조류퇴치 방법에 대한 연구 및 실험을 통하여 다양한 방법을 도입·시도하고 있으나, 문제점을 해소하는 데에 실패하거나, 기대했던 바에는 크게 미치지 못하고 있다. 여기에서는 그간 도입된 방법을 제시도 하거나, 새로운 방법을 고안하고 현장실험을 시행하여 조류퇴치 효과 여부에 대하여 알아보았다.