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        • KCI등재

          소아 Tethered Cord Syndrome의 자기공명영상

          박정미 대한영상의학회 1990 대한영상의학회지 Vol.26 No.2

          Tethered cord syndrome(TCS) is defined as low placement of the spinal cord and thickened film terminale with associated anomalies. To assess the diagnostic value of magnetic resonance (MR) imaging and to describe the MR findings of TCS, MR imagings of 30 children with clinically and radiologically diagnosed TCS were retrospectively analyzed. The MR imaging was performed with a 2.0-T superconducting scanner with T1- and T-2weighted spin-echo techniques in sagittal and axial planes. In 21 patients (70.0%), the level of the tip of conus medullaris was between L5 and S2. The causes of cord techering were lipoma or lipomeningomyelocele976.6%), meningomyelocele 916.7%) and possible thickened filum terminale (3.3%). Associated anomalies included cord syrinx (11 cases), dural ectasia (7 cases), Chiari malformations (5 cases) and so forth. Post-operative results including ascent of conus medullaris level, absence or presence of residual lipoma, etc., could be well delineated in post-op rative follow-up studies examined in 10 patients. Spinal MR proved to be a reliable, noninvasive procedure in the initial evaluation and post-operative follow-up studies of the TCS.

        • KCI등재
        • KCI등재

          폐쇄성 황달을 초래한 단발성 간내담관 낭종:비정형 카롤리병

          박정미 대한영상의학회 1989 대한영상의학회지 Vol.25 No.4

          Caroli's disease is an uncommon condition and characterized by congenital segemental saccular dilatation of intrahepatic bile ducts. A cases of Caroli's disease manifested by only a large communicating cystic dilatation of left intrahepatic bile duct and causing extrinsic pressure over the extrahepatic bile duct is pres-ented. The patient was 43-year-old housewife hospitalized because of abdominal distension and severe jaundice. To relieve jaundice and alleviate surgical intervention percutaneous drainage of the bile-duct cyst preceded surgery.

        • KCI등재

          디지털 감산촬영술을 이용한 비인강 폐쇄부전증의 평가

          박정미 대한영상의학회 1990 대한영상의학회지 Vol.26 No.2

          Velopharyngeal insufficiency(VPI) is a state of inability to make a connected speech by incompetent velopharyngeal port due to various causes. The examination methods are various, but digital subtraction technique is the method of choice because its good quality of image by subtracting surrounding overlapped structures, dynamicity, simplicity and possible quantitative analysis. We examined 102 suspected VPI patients by digital subtraction technique with good results and did quantitative analysis of the results of 28 patients in correlation with the speech evaluation.

        • KCI등재

          ICT 관련 상호변경이 주가에 미치는 영향

          박정미,박성태 대한경영학회 2019 大韓經營學會誌 Vol.32 No.6

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

          본 연구는 4차 산업혁명이 빅이슈가 되고 있는 이 시점에 상호변경을 중심으로 2000년의 IT 버블이 재현되고있는지 파악하기 위하여 ICT 관련 산업 여부 및 ICT 관련 용어로의 변경여부 그리고 정보통신분야가 붐을이루었던 2000년 여부에 따른 시장반응의 차이를 분석하였다. 분석 결과 및 시사점은 다음과 같다. 첫째, 상호변경은 기업 가치에 긍정적인 영향을 주고 있었으며, 상호변경이라는 이슈에 대하여 시장은 효율적이게 반응하고있다. 둘째, ICT 관련 산업 여부에 따른 시장반응에는 유의한 차이는 없었다. 셋째, ICT 관련 산업 여부와ICT 관련 용어에 따른 시장반응의 차이는 ICT 관련 여부와 상관없이 ICT 비관련 용어로 변경하는 것이시장에 유의하게 긍정적인 반응을 올릴 수 있었다. ICT 관련 산업인 경우 상호변경 공시 전에는 유의한 반응을보이고 있지 않았으나, 상호변경 공시 후에는 유의하게 긍정적으로 반응하고 있었다. 넷째, ICT 비관련 산업일경우 기존에 있는 ICT 관련 용어는 그대로 유지하는 것이 좋은 것으로 나타났다. 다섯째, IT 버블기였던 2000년의 상호변경에 따른 시장반응은 그 이후의 상호변경에 대한 시장반응과는 사뭇 달랐다. 4차 산업혁명이 또다른 버블을 창출할 것이라는 기대들이 있으나, 기업의 기술 트렌드가 전반적으로 IT 기반으로 바뀌고 있으며투자자들이 이전보다 똑똑해져서 2000년 이전의 버블은 다시 발생하지 않았다. 따라서 기업의 경영자들은기존 상호를 큰 돈을 투자하면서 ICT 관련 용어로 전환하지 않아야 할 것이다. 본 연구의 공헌도는 첫째, 본 연구는 상호변경이라는 기업의 전략의 효과를 정확히 측정하기 위해 선행연구에서는 제외되었던 상호변경 후 상장폐지된 기업을 추가하였고, 상호변경의 효과로 보기 어려운 사례 즉 합병등으로 인하여 구조적 변화를 동반한 상호변경 등을 제외하여 분석함으로써 선행연구와 차별화하였으며, 이를통해 KOSDAQ 시장에서의 순수한 상호변경 공시효과에 대한 반응을 보다 구체적으로 입증하였다. 또한 상호변경기업들의 어떠한 특성에 차이가 있는 지를 파악하기 위하여 시장반응에 차이를 준 요소들을 찾아 분석을하였으며, 이를 확고히 하고자 강건성 분석을 하였다. 그에 따른 표본의 한계를 줄이기 위하여 비모수 통계도함께 적용하였다는 점에서 의의가 있겠다. 따라서 상호변경에 대한 시장반응을 분석하려고 하는 후행 연구자들은 이런 점을 고려하여 분석할 것을 추천한다. 둘째, 본 연구는 4차 산업혁명에 따른 ICT 관련 산업 여부에따라 ICT 관련 용어 사용 여부의 시장 반응을 유효한 샘플을 가지고 분석한 국내 최초의 논문으로 관련 기업들이 상호변경을 고려할 때 유용한 지침이 될 것이다. 이는 또한 상호변경을 하려는 기업에 투자하고자 하는투자자들에도 중요한 지침이 될 것이다. The purpose of this study is to determine whether the IT bubble of 2000 is being reproduced around corporate name changes at a time when the fourth industrial revolution is taking place. For this purpose, the study analyzes differences in market responses depending on whether ICT-related industries or not, whether ICT-related terms or not, and whether in 2000 or not. This study analyzes effects of corporate name changes and differences between groups, focusing on the KOSDAQ(Korea Securities Dealers Automated Quotation, KOSDAQ) market, where changes in corporate name occur frequently. The research method conducts case studies using daily data of 566 cases of pure name corporate changes from January 2000 to December 2016, focusing on the KOSDAQ market. In order to analyze effects of pure corporate name changes, we include companies that have been delisted after changing their names and exclude companies with other events such as mergers during the name change period. These points are different with the previous studies. This study uses the event study methodology to calculate abnormal returns around the announcement dates of corporate name changes. T-test, and regression analysis are performed around the event study to analyze the effect on the entrepreneurial value of the entity's name change. Following the methods used by Cooper et al. (2001, 2005), Lee(2001) and Kot(2011) the abnormal returns earned by each firm are first computed as ARi,t = Ri,t − Rmt , t = -60,…..,+60, where Ri,t is the return for firm i on day t and Rmt is the KOSDAQ index return for day t. The cumulative abnormal return (CAR) over various event windows is then calculated. This study analyzes the impact of company name change on the value of the company by dividing the event period into the entire event period (-60 to +60) and the period before the company name change announcement (-60 to -1) and the period after the company name announcement (0,+60) in order to understand the efficiency of the KOSDAQ market. The results of the analysis are as follows: First, a corporate name change has had a positive effect on the value of the entity, and the market is responding efficiently to that issues. Second, there are no significant differences in market response depending on whether the ICT-related industry or not. Third, the market responds significantly positively to changing to ICT-unrelated terms, whether or not ICT-related industries are involved. Fourth, in the case of ICT-unrelated industries, it is recommended that existing ICT-related terms remain the same. Fifth, there are expectations that the fourth industrial revolution will create another bubble, but the technology trend in companies in general is shifting to IT-based and investors are becoming smarter than before, so the pre-2000 bubble is not happening again. The implications of this study are as follows: First, this study differentiates itself from prior research by analyzing changes in corporate name by adding delisting companies and excluding corporate name changes accompanied by structural change through mergers. So the effect of corporate name changes is more specifically demonstrated in the KOSDAQ market. In addition, factors that have caused differences in market response are found and analyzed in order to determine which characteristics differ from each other, and robustness analysis is performed to ensure this. Nonparametric statistics are also addressed to reduce the resulting limits of the sample. Therefore, it is recommended that follow-up researchers who want to analyse the market response to reciprocal changes take this into account. Second, this research is the first paper in Korea to analyze market responses to ICT-related terms with valid samples, depending on whether ICT-related industries are involved, and will be a useful guide when companies concerned consider changing their corporate names. This will also be an important guideline for investors who wish to invest ...

        • KCI등재

          CT 상 둔부 피하지방층 두께

          박정미 대한영상의학회 1986 대한영상의학회지 Vol.22 No.2

          Many calcifications due to fat necrosis in the buttocks detected on the pelvis roentgenogram suggest that the majority of injections intended to be intramuscular actully are delivered into fat. We measured thickness of adult gluteal fat to decide whether the injection using needle of usual length is done into fat or muscle. We measured the vertical thickness of the subcutaneous fat at a point of 2-3cm above the femoral head cut slice with randomly collected 116 cases of adults in the department of Radiology, St. Mary's Hospital, Catholic Medical College. We found that 32% female cases might actually receive on intraadipose injection when a needle of maximum 3.8cm length is inserted into the buttock. If deposition into muscle is desirable, we need to choose needle whose length is appropriate for the site of injection and the patient's deposits of fat.

        • KCI등재

          신생아에서의 인위적 식도 천공

          박정미 대한영상의학회 1990 대한영상의학회지 Vol.26 No.3

          Esophagus and pharyngeal structures of newborn are very weak and so vulnerable. When a parallel longitudinal tubular structure around (especially behind) the esophagus is seen, traumatic esophageal perforation must be differentiated. We report a case of esophageal perforation in a premature twin baby by nasogastric tube insertion.

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