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Visuomotor anomalies in achiasmatic mice expressing a transfer-defective Vax1 mutant
Min Kwang Wook,Kim Namsuk,Lee Jae Hoon,Sung Younghoon,Kim Museong,Lee Eun Jung,Kim Jong-Myeong,Kim Jae-Hyun,Lee Jaeyoung,Cho Wonjin,Yang Jee Myung,Kim Nury,Kim Jaehoon,Lee C. Justin,Park Young-Gyun,Le 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
In binocular animals that exhibit stereoscopic visual responses, the axons of retinal ganglion cells (RGCs) connect to brain areas bilaterally by forming a commissure called the optic chiasm (OC). Ventral anterior homeobox 1 (Vax1) contributes to the formation of the OC, acting endogenously in optic pathway cells and exogenously in growing RGC axons. Here, we generated Vax1AA/AA mice expressing the Vax1AA mutant, which is incapable of intercellular transfer. We found that RGC axons cannot take up Vax1AA protein from the Vax1AA/AA mouse optic stalk (OS) and grow slowly to arrive at the hypothalamus at a late stage. The RGC axons of Vax1AA/AA mice connect exclusively to ipsilateral brain areas after failing to access the midline, resulting in reduced visual acuity and abnormal oculomotor responses. Overall, our study provides physiological evidence for the necessity of intercellular transfer of Vax1 and the importance of the bilateral RGC axon projection in proper visuomotor responses.
Firm-Level Diversification and Response to Volatility in the US Manufacturing Sector, 1974-1998
Namsuk Kim 서울대학교 경제연구소 2010 Seoul journal of economics Vol.23 No.1
Do firms adhere to a predetermined list of products, as in the widely used assumption in firm-behavior studies or do they keep a portfolio of products flexible over time? This paper uses the Longitudinal Research Database of the U.S. Bureau of Census from 1974 to 1998 to study the trend and cyclicality of firm/plant level diversification of the manufacturing sector in the United States. Empirical results find that firms use diversification as one of the adjustment margins, using within- and between-plant diversification whenever possible. Firm-level diversification decreases as the uncertainty decreases in the U.S. manufacturing sector.
국내 유통 다소비 농산물의 잔류농약 모니터링 및 노출평가
강남숙(Namsuk Kang),김성철(Seongcheol Kim),강윤정(Yoonjung Kang),김도형(Dohyeong Kim),장진욱(Jinwook Jang),원세라(Sera Won),현재희(Jaehee Hyun),김동언(Dongeon Kim),정일용(Il Yong Jung),이규식(Gyuseek Rhee),신영민(Yeongmin Shin),정동윤(D 한국농약과학회 2015 농약과학회지 Vol.19 No.1
This study was implemented to evaluate food safety on residual pesticides in agricultural products of Korea and to use as a data base for the establishment of food policy. A total of 196 pesticide upon these products were analyzed using multi class pesticide multiresidue methods of Korean Food Code, and 232 samples of 15 agricultural products collected from 9 regions were supplied for this study. In the results, 64 kinds of pesticides were detected in 53 samples, chlorpyrifos and procymidone of them were shown a high frequency of detection in the analyzed pesticides. Among them, two samples (chlorpyrifos in perilla leaves and picoxystrobin in peach) were detected over Maximum Residue Limits (MRLs). The levels of the detected pesticide residues were within safe levels. Also, the intake assessment for pesticide residues including chlorpyrifos at multi pesticide residue monitoring were carried out. The result showed that the ratio of EDI (estimated daily intake) to ADI (acceptable daily intake) was 0.001~0.902% which means that the detected pesticide residues were in a safe range so that residual pesticides in the agricultural products in Korea are properly controlled.
김남석(Namsuk Kim),최도원(Dowon Choe),전영환(Younghwan Jeon) 한국항만경제학회 2012 韓國港灣經濟學會誌 Vol.28 No.1
본 연구는 새만금신항만을 건설함에 있어 국제적인 선사, 화주 및 포워더 유치를 위해 항만경쟁력 중 어떠한 국제경쟁력을 확보해야 새만금신항만의 활성화에 기여할 것인지 그 요인을 선정하는 것을 연구의 목적으로 하였다. 본 연구의 방법으로 요인분석 및 계층분석적 의사결정방법론(AHP)을 사용하였다. 선행연구를 통하여 짧은 입출입 항로, 주요 인프라 개발추진, 세제감면 및 규제완화를 비롯한 총 11가지의 측정변수를 선정하였고, 요인분석을 통해 ‘입지 및 시설’, ‘주변인프라 및 친수성’, ‘지역 정책 및 환경’의 총 3가지의 상위평가 요인들을 그룹핑 하였다. 본 연구에서는 측정변수들의 신뢰성 검증을 요약 분석한 결과 총 11개의 측정변수의 Cronbach alpha 계수가 0.8 이상으로 나타나 신뢰성이 있다고 판단할 수 있다. 또한 일관성 검증 및 상위평가기준 중요도 분석과 측정변수별 중요도 분석을 실시하여 측정변수들의 우선순위를 산정한 결과 ‘주요인프라 개발추진’이 가장 우선시 되는 측정변수로 선정되었으며 그 뒤를 이어 ‘중국 경제특구와 의 인접성’, ‘넓은 항만 배후부지’, ‘공항과의 인접성’, ‘국유지로 인한 국책사업의 가능성’ 순으로 나타났다. 새만금신항만의 경쟁력 제고를 위한 활성화 방안으로는 새만금신항만을 환황해권 물류중심 허브항으로 건설하고 환경변화에 따른 대형선사를 유치해야 한다. 또한 새만금신항만의 시사점으로서 새만금신항만을 중량물 전용부두로 건설할 것을 제안해 보았다. 본 연구는 향후 개장 될 새만금신항의 국제경쟁력 요인 선정에 있어 중요한 지표로 사용될 수 있을 것이다. This study aims to define which factors will contribute to vitalization of Saemangeum New Port to secure international competitiveness in order to attract international shipping companies, shippers and forwarders in constructing Saemangeum New Port, and to propose subsequent implications. For research methods of the current study, a factor analysis and a decision making method of analytic hierarchy process(AHP) were used. Through precedent studies, total 11 measuring variables were selected including short entrance and exit channels, main infrastructure development project, tax cut and deregulation, and through a factor analysis, total 3 high rank evaluation factors including ‘location and facilities’, ‘surrounding infrastructure and hydrophile property’, and ‘local policy and environment’. Analysis results summarizing a test of reliability of measuring variables in this study indicate that as Cronbach alpha coefficient of total 11 measuring variables were turned out to be over 0.8, it is surpassing general average 0.6, which means there is reliability.
물리치료과 학생의 온라인 수업만족도에 미치는 영향요인 : COVID-19 상황 중심으로
김남석(Kim Namsuk),황현숙(Hwang Hyun-Sook) 대한치료과학회 2021 대한치료과학회지 Vol.13 No.1
Objective: This study is a descriptive study to confirm the relationship between class satisfaction of the college students who are majored in physical therapy and teaching presence, academic self- efficacy, self-directed learning and to identify factors that influence class satisfaction. Method: The study subjects were 139 college students, and the collected data were analyzed using the SPSS WIN 20.0 program. Results: The study showed that the subjects teaching presence was 3.99 points, academic self-efficacy was 3.08 points, self-directed learning was 3.39 points and class satisfaction was 3.45 points. There was a significant positive correlation between class satisfaction and teaching presence (r=.55, p<.001), academic self-efficacy (r=.62, p<.001), self-directed learning (r=.63, p<.001). The factors affecting to class satisfaction of college students were teaching presence, academic self-efficacy, self-directed learning and the explanatory power was 52.0 %. Conclusion: To increase class satisfaction, it is necessary to apply a strategic teaching method to enhance a teaching presence, academic self-efficacy and self-directed learning.