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황윤재 ( Yun-jae Hwang ),한재환 ( Jae-hwan Han ) 한국농업정책학회 2016 농업경영정책연구 Vol.43 No.4
The purpose of this study is to analyze consumers` perception on food safety and policy credibility of GM agri-food. The main results are as follow; Firstly, consumers` perception on food safety and policy credibility of GM agri-food is interdependent. Secondly, knowledge level on GMO and satisfaction level on GMO related information affect consumers` perception on both food safety and policy credibility on GM agri-food. Thirdly, consumers with higher confidence level on the way of GM agri-food management in the market have higher probability of having positive opinion on food safety of GM agri-food. Finally, consumers with children tend to have higher concern on food safety of GM agri-food while consumers who are more sensitive on price tend to have less concern on food safety of GM agri-food.
황윤재 ( Yun Jae Hwang ),한재환 ( Jae Hwan Han ),이계임 ( Kyei Im Lee ) 한국축산경영학회 2015 농업경영정책연구 Vol.42 No.1
The purpose of this study is to analyze consumers’ perception on developing and cultivating GM agricultural products domestically. Double probit model is used to find the factors which affect consumers’ perception simultaneously. The main results are as follows; Firstly, consumers with higher confidence level on food safety and with higher knowledge on GMO tend to assent to the necessity of developing GM agricultural products domestically. Also, consumers who are familiar with GMO-related domestic situation have higher probability of supporting the domestic development of GM agricultural products. Secondly, consumers with higher concern on GM technology have higher probability of having negative opinion on the domestic development. Also, older people and low income people usually are more negative for the necessity. Thirdly, consumers with higher confidence level on GMO-related government policy and with more knowledge on GMO tend to assent the domestic cultivation of GM agricultural products which is similar to the results for consumers’ perception on GMO domestic development. Finally, consumers who are worried about unpredictable future risks of GMO tend to oppose the domestic cultivation. Thus, it can be concluded that since consumers’ knowledge level on GMO acts as key factor on consumers’ perception on developing and cultivating GMO domestically, it is necessary to provide consumers with objective and accurate information as a part of government’s risk communication strategy on GMO.
황윤재(Yoon-Jae Hwang),박제광(Je-Kwang Park),육종관(Jong-Gwan Yook) 한국전자파학회 2013 한국전자파학회논문지 Vol.24 No.10
본 논문에서는 이동통신 기기에서 ESD(ElectroStatic Discharge) 보호소자로 흔히 사용되는 TVS(Transient Voltage Suppressor) diode로 야기되는 잡음 신호가 안테나 무선감도 저하에 미치는 영향에 대해 분석하였다. 다양한 기능을 가진 스마트폰의 경우, 좁은 실장 공간으로 인해 스피커가 안테나 영역 근처에 존재할 수 있고, 스피커로 유입되는 ESD로부터 오디오 증폭기를 보호하기 위한 TVS가 안테나 GND로 사용되어지는 영역에 위치할 수 있다. 스피커를 구동시키는 class-D 증폭기에서 발생하는 디지털 오디오 신호와 안테나에서 커플링되어 스피커로 전달되어진 CDMA(Code Division Multiple Access) RF(Radio Frequency) 통신 신호가 TVS에 의해 믹싱되고, 안테나의 GND로 누설되어 안테나 무선감도를 저하시키는 현상에 대해 실험적 분석후 시뮬레이션을 통해 검증하였다. 이를 통해 비선형적인 ESD 보호소자가 신호의 원치 않는 결합통로가 되는 문제를 사전에 차단할 수 있을 것으로 보인다. In this paper, a TVS diode which is commonly used as a ESD protector in wireless communication devices could cause antenna wireless sensitivity to decrease has been analyzed. When a smartphone doesn’t have enough space to place many components, there would be its speaker near antenna area. In order to protect ESD coming through the speaker there also could be a TVS within antenna GND area. Digital audio signal which was sent to speaker and CDMA RF communication signal coupled from antenna was mixed by TVS. And this leakage current running through TVS resulted in decrease of antenna wireless sensitivity. The results of various experiments can be explained using circuit simulation. Following works will give us some insights that can reduce unwanted summation of digital and RF signal due to nonlinearity of ESD protectors.
황윤재 ( Yun-jae Hwang ),한재환 ( Jae-hwan Han ) 한국농업정책학회 2011 농업경영정책연구 Vol.38 No.3
Mutual cooperation between central and local governments is essential to effective food safety management. The purpose of this study is to analyze consumers` awareness for the roles of central and local governments and relationship between them for food safety management. This study conducted a random survey of 300 adults around capital area to accomplish an objective of the study. Also, econometrics model of binary logit was introduced to analyze consumers` awareness of the relationship between central and local governments. The results show that consumers who are female and relatively young think that there exists mutual cooperation between central and local governments. Also, the important factors are residence and education level. Consumers who are not highly educated and live in seoul area believe of the existence of mutual cooperation relationship. And consumers with high confidence for food safety management of government and high belief on importance of the roles of central and fundamental local governments also show belief on the existence of mutual cooperation relationship.