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안제욱(Jae-Ouk Ahn),김규영(Kyou-Yung Kim) 한국산업경제학회 2014 산업경제연구 Vol.27 No.6
연구는 총자산이익률이 횡단면 상에서 기대수익률을 잘 설명한다는 Novy-Marx(2013)을 따라 한국주식시장을 대상으로 실증분석을 실시하였다. 본 연구의 표본 기간은 1995년 7월에서 2013년 6월까지 18년 동안이고 한국주식시장에 상장된 431개의 제조기업을 표본으로 선택하였다. 본 연구의 실증분석결과는 다음과 같이 요약될 수 있다. 첫째, 기대수익률을 종속변수로 선택하고, 총자산이익률, 영업이익, 영업현금흐름, 장부가/시가 비율, 기업규모, 과거 1개월 전의 성과, 그리고 12개월에서 2개월 전 사이의 성과를 독립변수로 선택하여 Fama-MacBeth(1973) 회귀분석을 실시하였다. 분석결과, 채택된 독립변수들 중에서 총자산이익률의 기대수익률 설명력이 가장 높은 것으로 나타났다. 둘째, Fama and French(2006)를 이용하여 총자산이익률과 장부가/시가비율로 정렬하여 각각 5개의 포트폴리오를 구성하고 회귀분석을 실시하였다. 분석 결과, 총자산이익률로 정렬한 것이 장부가/시가 비율로 정렬한 것보다 평균수익률과 포트폴리오간 차이의 수익률에서 더 우수한 결과를 갖는 것으로 나타났다. 셋째, 총자산이익률과 기업규모를 이용하여 각각 4개의 포트폴리오로 구분하여 총 16개의 포트폴리오를 구성한 후 회귀분석을 실시하였다. 분석의 결과, 기업규모를 통제한 후 총자산이익률이 낮은 기업과 총자산이익률이 높은 기업들 사이에는 통계적으로 유의한 차이를 보이고 있음을 발견하였다. 넷째, 총자산이익률과 장부가/시가 비율을 이용하여 각각 4개의 포트폴리오로 구분하여 총 16개의 포트폴리오를 구성한 후 회귀분석을 실시하였다. 분석의 결과, 장부가/시가 비율을 통제한 후 총자산 이익률이 낮은 기업과 총자산이익률이 높은 기업들 사이에는 통계적으로 유의한 차이를 보이지 못함을 발견하였다. In this study, we test whether or not the so-called gross profitability premium exists in the Korean stock market along the lines of Novy-Marx(2013). The number of sample firms in the study is 431, all of which are manufacturing firms that had been traded on the Korea Exchange in a period from July 1995 to June 2013. Using the methodology by Fama and MacBeth(1973), we find that the gross profitability, measured by gross profit-to-assets, is the most important predictor of the cross-section of average returns in the Korean stock market. Profitable firms are shown to generate significantly higher returns than unprofitable firms do. Therefore, we conclude that there exists the gross profitability premium in the Korean stock market.
의료정보학 교과과정을 위한 의예과 2학년 학생의 컴퓨터 능력평가
안재억(Jae-Ouk Ahn) 한국의학교육학회 2005 Korean journal of medical education Vol.17 No.2
Purpose: To establish a medical informatics curriculum for premedical students. Methods: The author conducted a questionnaire survey on 202 second year premedical students from two medical schools, one in Seoul and one in Asan. The chi-square test was used to do a statistical analysis comparison of the results from these two school groups. In addition, the reliability test was used for the questionnaire s reliability. Results: The results of the survey show that computer skills in second year premedical students differ by gender. The results also indicate that differences exist between the two schools, as the curriculums of the freshman year differ between the schools. Moreover, it is observed that more than 60 percent of the subjects have difficulties dealing with complicated problems such as fixing or replacing hardware. Conclusion: The survey was conducted to assess the level of computer skills in premedical students at two medical schools. Through careful analysis of this survey, we were able to define the necessary level of computer skills required in premedical students in the Medical Informatics curriculum.
( Jae Ouk Shin ),( Jun Shik Hong ),( Jeong Yeal Ahn ),( Sang Min Lee ),( Sang Pyo Lee ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Hypereosinophilic syndrome (HES) is characterized by the absolute eosinophil count is≥ 1,500/mm3 for more than 6 months without any recognizable cause, and tissue damage is present. HES is subdivided into several clinically relevant variants. Myeloproliferative variant with gene mutation of fip1 like 1.platelet derived growth factor receptor.alpha (fiP1L1.PDGFRA), a kind of tyrosine kinase, is known to response dramatically to tyrosine kinase inhibitor such as imatinib mesylate. However, there were only a few case reports which described treatment with tyrosine kinase inhibitors in fiP1L1.PDGFRA.positive HES. Here, we described a case of successful treatment with imatinib mesylate in fiP1L1.PDGFRA.positive HES. A 30.year.old male patient was referred to tertiary hospital for eosinophilia, weight loss and chronic fatigue which persisted for 2 months. The evaluation for peripheral blood eosinophilia was performed, and the results were as followed. A peripheral blood smear and chemistry yielded marked eosinophilia with mild anemia and increased serum level of vitamin B12, respectively. Chest PA and chest computed tomography (CT) revealed mild hepatosplenomegaly. Stool exam and serologic test for parasites turned to be negative. Serum total IgE was within normal range. Bone marrow exam yielded bone marrow hypercellularity, and RT.PCR was positive for gene mutation of fiP1L1.PDGFRA, but not for that of fiP1L1.PDGFRB. The patient`s case was diagnosed as a fiP1L1. PDGFRA.positive myeloproliferative variant of HES. The patient received methylprednisolone and imatinib mesylate thereafter. Follow up studies showed that peripheral eosinophilia was resolved. After four months, a fiSH study for fiP1L1.PDGFRA showed that abnormal cells which presented 4q12 (CHIC2) deletion or PDGFRA.fiP1L1 fusion were no longer found. We report a case of fiP1L1.PDGFRA.positive myeloproliferative variant of HES which showed prompt and complete hematological response to treatment with imatinib mesylate.