Molecular characterization of cold stress-related transcription factors, CaEREBP-C1, -C2, -C3, and CaWRKY1A from Capsicum annuum L.

유병국,이재희,신선주,황을원,권혁빈 한국식물학회 2013 Journal of Plant Biology Vol.56 No.2

EREBP (ethylene responsive element binding protein) and WRKY (wizz-like transcription factor) are known to play roles in plant tolerance to abiotic stresses, such as low temperatures. Previously, we used cDNA microarrays and Northern blot analysis to determine the mechanisms responsible for those underlying defenses. These analyses led to the identification of CaEREBP-C1, -C2, -C3 and CaWRKY1A genes that encode the ethylene responsive element binding protein and wizz-like transcription factors, respectively, from hot pepper (Capsicum annuum). In that study, we demonstrated that the CaEREBP-C1, -C2, -C3 and CaWRKY1A genes were strongly induced by cold stress. Here, we used Tiplasmid and Agrobecterium-mediated transformation to engineer CaEREBP-C1, -C2, -C3 and CaWRKY1A under control of the CaMV 35S promoter for constitutive expression in transgenic plants. The resultant transgenic plants exhibited significantly increased tolerance to low temperatures. In addition, none of the CaEREBP-C1, -C2, -C3 and CaWRKY1A transgenic plants showed visible phenotypic alteration when compared to wild type plants. Taken together, these results suggest that CaEREBP-C1, -C2, -C3 and CaWRKY1A play important biological roles in conferring plant cold stress tolerance.

정치와 언론에 대한 고찰 및 그 상관관계 : 정치권력에 의한 언론의 실태를 중심으로

유병국 漢陽大學校 社會科學大學 新聞放送學科 1984 크로노스 Vol.15 No.-

대형마트 상생품목제도 영향의 지역적 평가

유병국,김순홍 한국유통과학회 2015 유통과학연구 Vol.13 No.10

Purpose – It has been argued that the regulations restricting entry and opening hours of General Super Markets and Super Super Markets have not been as effective as expected. In contrast, the win-win item scheme that appeared recently has the advantage that it could raise the effectiveness of the system in that win-win items are in principle resigned on the basis of bilateral agreements. This study analyzes the win-win item agreement made between Homeplus at Hap-jung and small traditional markets to examine the practical effectiveness of the win-win item scheme. While existing literature studying the regulatory effects have concentrated on the restrictions around store entry or opening hours of large retailers, it can be said that there have been few empirical studies on the effect of win-win items agreement with large retailers. Research design, data, and methodology – Homeplus at Hap-jung made a win-win items agreement with nearby small traditional market traders in 2013. In accordance with this voluntary agreement, Homeplus started by limiting its sales to 15 win-win items. The survey was conducted through one-on-one interviews, April 14 to May 2, 2014, by a professional public opinion research agency. The interviews were targeted at small business retailers in the nearby traditional market. We divided the traditional markets near Homeplus at Hap-jung where the win-win item agreement was achieved into two groups, win-win item agreement markets and non win-win item agreement markets, to compare the performance difference between the two groups. Results – To determine the change in sales of the 15 win-win items, we examined the performance difference between the two groups using two criteria (compared with similar items,and compared to sales volume a year ago). The results show that the individual sales of win-win items in the win-win item agreement markets are more likely to increase than in the non win-win item agreement markets. Total sales volume of individual stores in the agreement markets also showed a more significant increase compared to a year ago than those in non win-win item agreement markets. Conclusions – Contrary to the existing retail regulations that have one-sided and uniform characteristics, it can be pointed out that the win-win item scheme has the effect of increasing the success of the system itself because it is done on the basis of mutual agreement between General Super Markets and traditional markets. The empirical results of this study can be said to support this conjecture. For the successful settlement of a win-win items agreement, the following points should be reviewed. First, it requires a great effort from the selection process of win-win items in order to improve the effectiveness of the agreement. Second, the existing General Super Markets customers should be introduced to the traditional markets or small shops to increase the sales of win-win items. Therefore, voluntary effort is essentially required from the traditional markets to engage customers.

A Study on How General Super Markets Affect Traditional Markets Performance

유병국,김순홍 한국유통과학회 2017 유통과학연구 Vol.15 No.11

Purpose - In Korea, general super markets have a great impact on the market performance of traditional markets. We propose a modified two stage DEA model for evaluating the performance of traditional markets in Incheon, Korea by identifying the influence of external environmental factors including the presence of general super markets as non-discretionary variables in DEA. Research design, data, and methodology - After obtaining bias-corrected estimates of original DEA efficiency scores using the input and output data of 49 traditional markets, we regress them on several external environmental factors by bootstrap- truncated regression. Results - We obtain bias-corrected efficiency scores from the original DEA efficiency scores by bootstrap and among the five environmental factors, the residential population and the presence of general super markets or SSMs can be considered as the driving forces influencing bias-corrected efficiency scores, positively and negatively, respectively. Conclusions - When DEA efficiency scores tend to be overestimated, we need to use a biased-corrected efficiency score by bootstrap. It is important to note that the efficiency of traditional markets can be largely influenced by external environmental factors such as the presence of general super markets or SSMs that traditional markets can not control. Therefore, it is desirable to consider such environmental factors appropriately for a reasonable performance evaluation.

Directed Control of Conductive Filaments in Resistive Switching Materials by Self-Assembled Nano-Insulators

유병국,김종민,정연식,이건재 한국고분자학회 2014 한국고분자학회 학술대회 연구논문 초록집 Vol.2014 No.4

외부 환경변수을 고려한 인천 전통시장의 효율성 분석

유병국,김순홍 한국유통학회 2015 한국유통학회 학술대회 발표논문집 Vol.2015 No.5

Adaptive fuzzy sliding mode control

유병국,정사철,함운철,Yoo, Byung-Kook,Jeoung, Sa-Cheul,Ham, Woon-Chul 제어·로봇·시스템학회 1996 제어·로봇·시스템학회 논문지 Vol.2 No.4

본 논문에서는 퍼지추정기와 슬라이딩 모드제어이론이 고려되었다. 비선형시스템에 대한 슬라이딩 모드 제어기 설계 시에 그 시스템의 비선형함수를 추정하기 위하여 퍼지논리시스템이 사용되는 두가지의 적응처지슬라이딩 모드제어방식을 제안한다. 첫번째 방식에서는 비선형시스템, x/sup (n)/=f(x under bar, t) + b(x under bar, t)u 의 알지 못하는 함수 f를 추정하기 위하여 하나의 퍼지논리시스템이 사용되어진다. 두번째 방식에서는 비선형시스템의 f와 b에 대한 추정기로서의 두개의 퍼지논리시스템이 각각 사용되어진다. 각각의 방식에 대하여 제어시스템의 안정도를 보장하도록 하는 적응법칙을 설계하며 퍼지추정기와 비선형함수와의 추정오차를 줄이기 위해 각각에 대한 강인한 제어법칙을 제안한다. 제안된 네 가지의 제어법칙에 대한 안정성을 증명하고 컴퓨터시뮬레이션에서 역진자시스템에 적용하여 그에 대한 타당성과 각각의 비교를 보인다.

살충제로 인한 건장장애의 조기 발견

유병국 가톨릭대학산업의학센타 산업의학연구소 1976 韓國의 産業醫學 Vol.15 No.2

유기인제 농약의 사용이 점차 늘고 있으며 많은 나라들에서 사용이 제한되고 있는 유기염소제 농약에 대신하며 많은 유기인제 농약들이 개발되고 있다. 이런 관점에서 폭로된 사람들에 대한 정기적 감시와 엄격한 주의가 필요하게 되었다. 유기인제 농약의 독성은 비교적 약한것들(예, 말라치온)과 매우 강한 것들(예, 메빈포스, 파라치온)로 여러가지가 있다.

환경가치의 지역적 평가 : 강화도 남단 갯벌에 대한 여가가치 추정 Estimation of Recreation Value of Mud Flats in Southern Region of Kangwha-do

유병국 한국지역개발학회 1998 韓國地域開發學會誌 Vol.10 No.3

While wetlands were once considered of negligible if any, in recent years they have attracted the attention of the environmental movement and are now viewed as a valuable ecological resources. This study uses contingent valuation method (CVM) to estimate recreation value of mud flats in southern region of Kangwha-do which seems to be conserved most well in Korea. In addition, it is argued that it is actually irrelevant to implement conventional cost benefit analysis for wetland (mud flats) reclamation problem when most people reveal lexicographic preference.

비순응하의 비용증가전략

유병국 한국산업조직학회 2000 産業組織硏究 Vol.8 No.2