trans-Resveratrol Relaxes the Corpus Cavernosum Ex Vivo andEnhances Testosterone Levels and Sperm Quality In Vivo

Sunhee Shin,박동선,Min-Jung Jang,Bong Ho Choi,주성수,남상섭,김종춘,김윤배,Jeong Hee Jeon,Jae-Hong Choi 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.1

We examined the effects of trans-resveratrol on male reproductive functions; ex-vivo penile erection and in-vivo sperm counts and quality. For the ex-vivo study, the relaxation effects of resveratrol on isolated New Zealand white rabbit corpus cavernosum, precontracted by phenylephrine (5×10-5 M) were measured. The in-vivo study measured reproductive organ weights, blood testosterone levels, testicular histopathology, sperm counts, as well as the epididymal sperm motility and deformity of male ICR mice given an oral dose of resveratrol (50 mg/ kg) for 28 days. Resveratrol elicited a concentration-dependent relaxing effect on corpus cavernosum, leading to a median effective concentration (EC50) of 0.29 mg/mL. Repeated treatment with resveratrol (50 mg/kg) did not cause an increase in body weight, reproductive organ weight or testicular microscopic findings; however, resveratrol did elicit an increase in blood testosterone concentration, testicular sperm counts and epididymal sperm motility by 51.6%, 15.8% and 23.3%, respectively, without influence on sperm deformity. In conclusion, we propose that resveratrol has a positive effect on male reproductive function by triggering a penile erection, as well as enhancing blood testosterone levels, testicular sperm counts, and epididymal sperm motility.

Between Past and Future: The 8th YBU-KATE Conference on English Language Education & the 10th Anniversary of YBU-KATE Conference

Sunhee Choi 한국영어교육학회 2013 KATE Forum Vol.37 No.2

RA Theory as a Grand Theory of Consumer-led Nontariff Barriers

Sunhee Choi 전북대학교 산업경제연구소 2014 아태경상저널 Vol.6 No.3

The presence of nontariff barriers is not an abnormal phenomenon in the international marketplace. Barriers, either country-specific or -general, other than tariffs and/or the consumer subculture of anti-globalization are pervasive. Both economics and marketing disciplines acknowledge the existence of macro- and micro-level resistance toward the flow of products across borders: (1) government-led regulations on packaging, custom, freight, quantity and quality, promotion and safety of imported products; and (2) consumer subculture such as consumer animosity, consumer ethnocentrism, negative country-of-origin image and cultural distance. Yet, a number of scholars point out that there is no overarching framework. After comparing the perfect competition and Resource-Advantage (RA) theories, the author concludes that RA theory better explains the global competition and various nontariff barrier phenomena in terms of demand, consumer motivation, firm motivation and the nature of the global environment.

Preservice Elementary School Teachers’ Efficacy Beliefs Towards Teaching English

Sunhee Choi 한국영어학학회 2008 영어학연구 Vol.- No.26

The main purpose of this study is to examine the levels of efficacy beliefs that preservice elementary school teachers have regarding teaching English as a foreign language. Teacher efficacy belief is a teacher’s judgment of his or her capability to organize and execute the courses of action to teach successfully a specific subject in a given context. Data were collected through two questionnaires measuring teacher efficacy and English proficiency administered to 159 preservice elementary school teachers. The results showed that preservice teachers’ efficacy beliefs were relatively low and there were gaps between the preservice teachers’ perceptions of their current levels of English proficiency and desired levels needed to teach English to elementary school students. It was also found that preservice teachers’ efficacy beliefs were positively related to their English proficiencies and willingness to teach English. Implications for teacher education and future research are discussed.

Developing Standards for English/Foreign Language Teachers

Sunhee Choi,Ji Yeon Lee APEC국제교육협력원 2008 국제교육협력연구지 Vol.1 No.2

House with Frame

Choi Sunhee 현대건축사 2012 (월간)Maru Vol.- No.123

R-A Theory as a Grand Theory of Nontariff Barriers

Sunhee choi 한국산업경제학회 2014 한국산업경제학회 정기학술발표대회 논문집 Vol.- No.추계

강수량을 이용한 새만금호 염분농도 예측모델

최선희 ( Sunhee Choi ),김석휘 ( Seokhwi Kim ),김원장 ( Wonjang Kim ),강창현 ( Changhyun Kang ),김강주 ( Kangjoo Kim ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-

새만금수역에서의 영양염류와 염분농도의 관계에서 볼 때 만경강과 동진강으로부터 유입되는 담수와 해수의 혼합 정도가 가장 큰 요인으로 관찰되었다. 즉, 담수 하천을 통해 유입되는 담수의 양에 의해 영양염류의 농도가 상당부분 결정되는 것으로 해수-담수 혼합효과가 가장 중요한 영양염 농도 제어인자라고 할 수 있는 것이다. 이에 의한 영향이 제대로 평가된다면 새만금수질에 있어 가장 중요한 부분이 해결된 것이고 이후에는 플랑크톤의 활동과 저층 영양염 용출 효과만을 생각 하면 될 것이다. 그런데, 담수유입에 의한 효과를 정량화하기 위해서는 상류의 유입유량, 새만금호내의 저수량, 그리고 배수갑문의 통수유량 자료가 필요하다. 그러나 현재 배수갑문의 개폐에 따른 통수 유량 데이터는 산출되어 있지 않고, 상류하천으로부터의 유입되는 유량모델도 담수유입에 의해 급변하는 새만금호의 수질변화를 적절하게 표현하는데 한계가 있다. 이에 본 연구에서는 단순히 강수량을 기준으로 새만금호의 염분농도가 얼마인지를 예측할 수 있는 모델을 개발하였으며, 염분농도는 곧 담수의 유입을 직접적으로 지시하는 변수이기 때문에, 이를 바탕으로 담수에 의한 수질영향 부분은 근사적으로 예측할 수 있을 것이다. 만약 영양염의 저층용출부분과 플랑크톤에 의한 영향을 추가적으로 정량화한다면 이에 더하여 종합적인 수질을 예측할 수 있을 것이다. We could quantitatively evaluate the role of factors controlling the temporal variation of nutrient concentrations in a saline lake recently constructed by tideland reclamation using multivariate statistical techniques. Factors affecting water quality were identified from factor analysis and their contributions to the concentrations of nutrient species were estimated based on multiple linear regression analysis. The objectives of the investigation are monitoring on the present status of water qualities of the lake and establishment of counter-measures to minimize the environmental impacts, especially on the water qualities. From the factor-analysis to identify the key parameters on the water qualities, fresh-water input and biological activities are the most important factors on the surface water qualities, but in addition to the fluvial water, underground water should be considered as another important factor on the bottom water quality.

새만금호 수질의 계절적 및 공간적 특성 분석

최선희 ( Sunhee Choi ),배요섭 ( Yoseop Pae ),이태호 ( Taeho Lee ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-

새만금방조제 끝막이 공사 이후 새만금호는 여건변화에 따라 양질의 수자원을 확보하기 위한 수질관리대책 마련이 시급하다. 현재, 새만금호는 수위 및 수질관리를 위하여 배수갑문 조작을 통한 해수의 유 · 출입을 이용하여 혼합 · 희석시키는 대규모 수질관리정책을 실시하고 있다. 이에 따라, 새만금호는 일반적인 호소와는 다른 수질경향을 보이고 있다. 즉, 수온 변화, 강우영향 및 하천수의 유입량과 영향범위, 배수갑문을 통한 해수유입과 해수의 영향범위에 따라 매우 복잡한 형태의 수질변화 경향을 보인다는 것이다. 이에 본 연구에서는 새만금사업단이 지속적으로 실시해 온 수질모니터링 결과(‘08~’09)를 통하여 수집 · 확보된 자료를 기반으로 새만금호 수질의 계절, 공간적 변화 특성 및 경향을 살펴보고, 향후 새만금호 수질환경변화를 감시하고 대책을 수립하는데 기초자료를 제공하고자한다. Due to the Saemangeum lake created by the completion of the sea dike in 2006, its water qualities have been urgently required to be monitored. Therefore the comprehensive monitoring, intensive parameter analysis, and optimum management strategies on the lake have been sought. Surveys have been executed during 2008~2009. The most distinct pattern of water quality in the lake was high nutrient concentrations at the river mouth and gradual decrease to the dike. And fluvial impact are greatest during the rainy summer season, and shrunk during the winter. The objectives of the investigation are monitoring on the present status of water qualities of the lake and establishment of counter-measures to minimize the environmental impact, especially on the water.

국어과 글쓰기 방법에 기반한 사회과 쓰기 활동 개선 방향 탐색

최선희(Choi sunhee),구본관(Koo bonkwan) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.12

이 논문은 국어과의 쓰기 방법에 비추어 사회과의 쓰기 활동을 검토하고 이를 개선하기 위한 필요성 및 그 방향을 모색하기 위한 논의이다. 이를 위해 고등학교 학습자와 교사가 사회과 글쓰기에 대해 가지는 인식을 설문조사와 서면 인터뷰를 통해 알아보았다. 그런 다음 고등학교 학습자가 행한 사회과 글쓰기 자료를 쓰기 기준에 따라 분석하였다. 그 결과 학습자는 대체적으로 사회과에서의 쓰기를 중요하게 인식하고 있음에도 불구하고 실제 글쓰기에서는 해결되어야 할 문제적 현상들이 나타났다. 본고는 이러한 문제점이 발생한 원인으로 사회 교과서에 구현된 쓰기 활동에 주목하였다. 쓰기 활동 분석을 위해 먼저 고등학교 국어 교과서에 제시된 쓰기 활동을 검토하고 이를 바탕으로 통합사회 교과서에서의 쓰기 활동을 살펴보았다. 이상의 논의를 종합하여 국어과 쓰기 방법과의 연계를 통해 사회과 쓰기 활동이 개선될 수 있는 가능성을 확인하고 그 개선 방안을 제안하였다. The purpose of this study is to examine writing activities found in social studies and find out the necessity and points of convergence with those found in the Korean subject. To address the goal, this author investigated high school students and teachers’ recognition on convergent education and writing in social studies. Next, this researcher looked into materials written by high school learners in the social studies subject according to the criteria of writing. The results have shown that learners mostly regard writing in social studies to be important; however, there are problematic phenomena found in their actual written materials to be solved. Based on the causes of those problems, this author paid attention to writing activities embodied in social studies textbooks. Concretely, this researcher examined writing activities suggested in high school Korean textbooks and analyzed writing activities included in integrated social studies textbooks based on that. Summing up the discussion above, this author has found there is possibility to improve writing activities in social studies through convergence with those in the Korean subject and actually suggested here how to enhance them.