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미숙아망막병증에서 경공막 다이오드 레이저 광응고술의 5년간의 치료경험
박준우,조희준,조영욱,Joon Woo Park,Hee Joon Cho,Young Wook Cho 대한안과학회 2006 대한안과학회지 Vol.47 No.12
Purposes: We analysed the five-year outcomes and associated complications of transscleral diode laser photocoagulation (TSDLP), used to treat acute proliferative retinopathy of prematurity (ROP), to evaluate the efficacy and safety of this therapy. Methods: We performed a retrospective analysis of the records of 163 eyes of 82 infants with acute ROP, who were treated with TSDLP by a single surgeon. Follow-up periods ranged from 15 to 278 weeks. Results: The outcome was favorable in 158 eyes (96.9%) and unfavorable in 5 eyes (3.1%) of the 163 eyes that were treated. Vitreous hemorrhage was found to be an indicator of poor prognosis. Of the complications noted, symblepharon was observed in three eyes, hyphema was observed in four eyes, and a complicated cataract was observed in one eye. Conclusions: The results suggest that TSDLP is a safe and effective in the treatment of ROP. Vitreous hemorrhage should be regarded as a sign of poor prognosis.
박준우 ( Joon Woo Park ) 한국국제경영학회 2012 國際經營硏究 Vol.23 No.4
Since the capital market has been opened in Korea, the importance of foreign investors has gradually risen up the concerns. However, up to now, some arguments have been made on whether the foreign investors have affected positively to the domestic stock market, or not. Numerous studies have been doing in this topic for that reason. The purpose of this study is to investigate the influence of the stock prices when foreigners invest to the domestic firms, especially with participation in management, while it would be under the assumption that the influences of foreign investors to the domestic firms would be positive(+). Much previous studies mainly did research about the effect of disclosure on the foreign investment, the author expands the scope of study on observing the long- term performance of the stock price and the management performance. The results are summarized as follows. Firstly, It turns out that the managing participation of the foreign investors have a positive(+) AR(abnormal return) in the stock market. This results may imply that investors expect the management performance improved by foreign investor. Namely, it is based on the reflection of their expectation that foreign investors can watch on the firm`s managers and fall down the agent cost.Secondly, since foreign investors are disclosed on the managing participation, the stock prices have shown a positive(+) BHAR and CAR, approximately for 3 years. Thirdly, since foreign investor take part in Korean firm management, their performance is improved. These results mean that the participation of foreign investors in the management have taken a effective management into the firms through their advanced business and monitoring management skill. Furthermore they have a improved performance of firms and a rise of stock price.
박준우(Park Joon Woo) 한국산업경영학회 2007 경영연구 Vol.22 No.3
본 연구는 최고경영자 교체기업 주가의 장단기성과와 기업성과의 변화를 측정하였다. 표본은 1999년부터 2003년 사이에 최고경영자 교체가 이루어진 기업을 대상으로 하였다. 본 연구의 결과는 다음과 같다.<BR> 첫째, 최고경영자 교체공시에 따른 주식시장에서의 단기적인 주가성과는 부(-)의 초과수익률을 보였다. 그리고 과거성과가 저조한 기업이 성과가 좋은 기업보다 교체공시로 인한 단기성과가 더 좋았다.<BR> 둘째, Fama-French의 3요인모형을 이용하여 최고경영자 교체에 따른 주가의 장기성과를 측정한 결과, 교체 후 36개월 동안 정(+)의 장기성과를 확인하였다. 동일가중방법에 의하면, 교체된 최고경영자의 재임기간이 가장 긴 표본의 경우에 가장 높은 장기성과를 보이는 것으로 나타났다. 그리고 강압적인 교체가 자발적인 교체보다, 과거성과가 좋지 않은 기업들이 과거성과가 좋은 기업들보다, 기업규모가 작은 기업이 큰 기업보다 장기성과가 더 좋은 것으로 나타났다.<BR> 셋째, 최고경영자 교체 전후 재무성과를 비교해 보면, 교체-1년도에 재무성과가 가장 좋지 않았으며, 최고경영자 교체 후 재무성과가 향상되었으나, 교체 후 2년까지만 지속되었다. 강압적 교체의 경우에는 교체로 인한 재무성과가 교체 전보다 좋아졌으나, 자발적 교체의 경우에는 교체 전보다 재무성과가 정체 또는 나쁘게 나타났다.<BR> 끝으로, 최고경영자 교체로 인한 총자산경상이익률(OROA)변화에 영향을 미치는 요인을 조사한 결과, 소유경영자 더미변수와 경기상황 더미변수는 총자산경상이익률(OROA)의 변화와 통계적으로 유의한 부(-)의 관계를, log(총자산)과는 기업성과의 변화와는 정(+)의 관계를 보였다. This paper investigates the short-run and long-run performance change following CEO turnover in Korea. In this study, 202 firms are used as our sample from 1999 to 2003. The estimate of announcement effect is based on the market model, and the estimate of the long-run performance is based on the three-factor model developed by Fama-French(1993). We examine firms" financial performance, including OROA and ROS, from year -3 to year +3 around CEO turnover.<BR> The results of the study are as follows: First, there are insignificantly negative abnormal returns on the announcement day of CEO turnover and significant negative CARs surrounding the event day. This suggests that investors view CEO turnover announcements as bad news. Second, post-CEO turnover, long-run performance is positive for three years. Third, firms" financial performance is the worst in year -1(pre-turnover), but post-turnover financial performance improves up to year +2. Last, OWN(Owner CEO dummy) has a negative effect and ECON(Economy Situation dummy) has a negative effect on OROA. log-ASSET is a positively associated with OROA.
중,고등교육의 효과적인 스마트러닝을 위한 Beacon 활용성 연구
박준우(주저자) ( Joon Woo Park ) 커뮤니케이션디자인학회 2016 커뮤니케이션 디자인학연구 Vol.55 No.-
사회의 스마트화에 따라 다양한 분야에서 스마트디바이스와 기술을 활용한 미디어 커뮤니케이션 환경이 조성되고 있다. 이에 따라 교육 분야에서도 스마트를 접목한 스마트 러닝의 활용이 활발해지고 있다. 또한 스마트화는 IoT라는 사물인터넷 혁명을 통해 기존보다 더욱 유기적이고 상호작용이 활발한 미디어 패러다임으로 진화하였으며, IoT의 중계적 역할을 하는 비콘의 활용성이 크게 부각되고 있는 시점이다. 따라서 본 연구의 목적은 중고등교육의 효과적인 스마트러닝을 위하여 IoT 환경의 비콘의 활용 가능성을 확인하는것이다. 이를 위한 연구 방법으로 이론적 고찰을 통해 IoT 환경에서 비콘의 사례 분석을 통한 활용 특성을 도출하고, 스마트 러닝의 요인에 미치는 영향성 분석을 위하여 설문을 통한 통계적 분석기법을 활용하였다. 분석 결과 중·고등학생과 대학생을 대상으로 비콘의 특성이 스마트 러닝 특성에 따른 긍정적 영향성을 확인하였으며, 분석을 통해 도출된 결과 값을 통해 향후 스마트 러닝에서 효과적인 비콘 활용을 기대한다. As the society is becoming more intelligent, media communication environments with smart devices and technologies are being constructed in various fields. Accordingly, the utilization of smart learning is becoming more active in the field of education. Intelligence has evolved into a more organic and interactive media paradigm through IoT (Internet of Things), and the utilization of Beacon, which plays the intermediary role in IoT, is becoming emphasized. The aim of this study is to examine the utilization possibilities of Beacon in the IoT environment for effective smart learning in middle & high school curriculums. For the study method, theoretical study was conducted by deriving utilization features through an analysis performed on the examples of Beacon utilization in the IoT environment, and in order to analyze the effects brought onto the features of smart learning, statistical analysis was used by conducting a survey. Results of the analysis, which was conducted on middle school, high school, and college year students, implied that the features of Beacon had positive effects on smart learning. Values obtained through the analysis were used to derive a system for the utilization of Beacon in future smart learning.