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문준철(Moon Jun-cheol),강성수(Kang Seong-soo),김준호(Kim Jun-ho) 한국국제회계학회 2016 국제회계연구 Vol.0 No.65
본 논문은 최근 들어 외국인투자자의 영향력이 점점 커지는 상황에서 우리나라 주식시장의 주요한 참여자인 개인투자자 및 기관투자자의 투자행태나 투자성과에 대한 논의와 외국인투자자의 투자행태와 투자성과를 분석하였다. 데이터의 구성은 유가증권시장에 상장되어 있는 12월말 결산법인의 일별 주가자료를 이용하여 투자주체를 개인투자자, 기관투자자, 외국인투자자로 분류하고, 포트폴리오는 매년 12월을 기준으로 재구성하고 규모효과를 제거하기 위해 시가총액을 기준으로 상위 30% 종목들을 선정하고 포트폴리오 성과 측정을 위해 Fama and French three-factor model을 사용하였다. 또한 무위험수익률은 3년만기 국고채 수익률을 사용하였고 시장수익률은 종합주가지수를 사용하였다. 본 논문의 결과는 다음과 같다. 첫째, 투자주체별 투자행태를 살펴보면 개인투자자는 외국인투자자와 기관투자자와 보유비중에서 유의한 부(-)의 상관관계를 나타냈고, 외국인투자자와 기관투자자의 비교에서는 유의한 정(+)의 상관관계를 보였다. 둘째, 투자주체별 지분율에 따른 포트폴리오 성과는 외국인투자자, 기관투자자, 그리고 개인투자자 순으로 높은 성과를 올리는 것으로 나타났다. 셋째, 위험요인을 통제한 Fama and French three-factor model을 이용하여 투자주체별 지분율에 따른 포트폴리오 성과에서도 외국인투자자는 다른 투자주체에 비해 높은 성과를 올리고 있음이 나타났다. 이러한 수익률은 차이는 통계적으로도 유의한 결과를 나타내어 외국인투자자의 정보이용이 다른 투자주체보다 높다는 것을 알 수 있다. After the foreign exchange crisis, foreign investors" power has been growing in stock market. In this state, investment behavior and portfolio outcome of the main participants like individual investors or institutional investors in Korean stock market have always been compared to those of foreign investors. Using the December stock price data of evaluating corporate bodies listed in the securities market, the subjects were sorted by individual investors, institutional investors and foreign investors. According to the share rates of these subjects, we organized portfolios and analyzed investment behaviors of each investor and portfolio outcome. Portfolios were reorganized on annual December basis. To get rid of size effect, we selected 30% of high-rank brands in terms of market capitalization. Fama and French three factor model was used in measuring the portfolio outcome. Also, risk-free rate of return was referred to 3 year-expiry national・public rate of return and market profit rate was referred to the composite price index of stocks. These are the conclusions of this study. Firstly, in the investment behavior classified by investment subjects, individual investors showed negative correlation about the relative importance of retention with institutional investors and foreign investors. In comparison with institutional investors and foreign investors, the correlation was verified. Secondly, in portfolio outcome classified by investment subjects, foreign investors got the highest results and institutional investors were second, while individual investors showed poor results. Lastly, Using the Fama and French three factor model to control the danger factor, foreign investors had more profits in portfolio outcome. The earning rate showed considerate results statistically. By this result, we can find that the foreign investors make better use of information than other investors.
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옥수수 유묘기 한발 스트레스 평가를 위한 발현마커 후보군 탐색
문준철(Jun Cheol Moon),신승호(Seungho Shin),김효철(Hyo Chul Kim),송기태(Kitae Song),김재윤(Jae Yoon Kim),김경희(Kyung Hee Kim),이병무(Byung Moo Lee) 한국육종학회 2018 한국육종학회지 Vol.50 No.3
Drought stress during the seedling stage has a disastrous effect on the growth of maize. The purpose of this study was to assess the developed expression markers that are related to drought stress in maize. For the selection of expressed genes by drought stress, co-expression analysis was carried out using published microarray data of drought stress in maize (Zea mays L.) seedlings. Six consensus modules were based on 4,770 stress responsive genes differentially expressed in drought stress, and the royal blue module was chosen. Thirty genes were selected according to different expression patterns between susceptible and tolerant types. Drought stress treatments were performed on both Ki3 and Ki11. Ki3 and Ki11 are widely known drought-susceptible and -tolerant types, respectively. At first, the 30 selected genes were compared to Ki3 and Ki11 using qRT-PCR. The gene expression values of eight genes (BU050895, BF728598, CK827168, CO524848, AF457983, CF037152, AJ606944, and BG836522) were significantly tolerant types rather than susceptible types in the roots. After applying the eight above-mentioned genes to nine cultivars, a different pattern was detected between susceptible and tolerant types. The results of the present study will show the possibility of developing novel expression markers and the application for various maize varieties.
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김경희(Kyung-Hee Kim),문준철(Jun-Cheol Moon),김재윤(Jae Yoon Kim),이병무(Byung-Moo Lee) 한국육종학회 2016 한국육종학회지 Vol.48 No.2
Anther culture is useful and significant tool for producing haploid or doubled haploid (DH) plants in crop breeding system. Androgenesis is the way of inducing haploid and DH plants from anther (immature pollen) or microspore culture. In vitro androgenesis is efficient technique for introducing complete homozygous lines in one generation, thus less time and expense could be necessary than conventional plant breeding. In maize, anther culture is important system for shortening the breeding cycle and enhancing selection efficiency. Anther culture technique is also applicable to various researches such as molecular genetics, genetic engineering, genomics, and plant biotechnology. We review the past and present studies on anther culture and provide useful information for future researches on androgenesis in maize. The combination of androgenesis with other techniques such as molecular breeding and biotechnology is producing a variety of variety of maize species. In addition, we suggest strategy to develop androgenesis technique adapted to Korean research environment.
KCI
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