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장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.
α-glucosidase inhibition of Cudrania tricuspidata according to each parts and period. (초)
( Hyeong U Son ),( Chul Hong Park ),( Jin Chul Heo ),( Dong Yoon Nam ),( Si Rim Lee ),( Hyun Jin Lee ),( Tae Yang Cha ),( Jin Hong Baek ),( Sang Han Lee ) 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2010 한국식품저장유통학회 학술대회 Vol.2010 No.-
강화학습을 이용한 포트폴리오 투자 프로세스 최적화에 대한 연구
손형진 ( Hyeong-jin Son ),임동휘 ( Lim Donhui ),한영우 ( Young-woo Han ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
포트폴리오 구성문제는 과거부터 현재까지 많은 연구가 이루어지고 있다. 현재는 강화학습을 통해 포트폴리오를 구성하는 연구가 많이 진행되고있다. 포트폴리오를 구성함에 있어 종목선택과 각 종목을 얼만큼 투자할 것인지는 둘 다 중요한 문제이다. 본 연구에서는 과거부터 많이 사용해오던 방식을 차용하여 강화학습 방법과 접목시켰고 이를 통해 설명력이 높은 모델을 만들려고 노력하였다. 강화학습에 사용한 모델은 PPO(Proximal Policy Optimization)을 기본으로 하였고 인공신경망은 LSTM을 활용하였다. 실험결과 실험 기간 동안(2023년 3월 30일 부터 108 영업일 까지)의 코스피 수익률은 5%인데 반해 본 연구에서 제시한 모델의 수익률은 평균 약 9%를 기록했다.
환경개선펀드의 운용 특성에 관한 연구 : 산업단지내 부동산개발사업을 중심으로
손진수(Son, Jin-Soo),서진형(Seo, Jin-Hyeong) 한국부동산법학회 2021 不動産法學 Vol.25 No.2
최근 노후한 산업단지의 구조개선을 위한 사업으로 환경개선펀드에 의한 개발사업이 급격하게 성장하고 있다. 이에 본 연구는 환경개선펀드 투자로 인한 부동산개발사업을 분석하여 주요 특징을 도출하고 지속적인 발전을 위한 개선방안을 제시하는데 주요한 목적이 있다. 분석결과 개발사업의 운영이라는 측면에서의 주요 특징은 다음과 같다. 첫째, 공공적인 특성으로 인해 민간사업자의 출자비율과 사업주간사의 자본금비율이 높아 사업의 안정성이 증가한다. 둘째, 지식산업센터와 같은 선분양형상품이 높은 비중을 차지하고 있다. 셋째, 수도권지역의 비중이 높게 나타난다. 펀드사업의 안정적인 발전을 위해서는 민간사업자의 신뢰도를 높이기 위한 방안과 지역간 격차를 완화하기 위한 노력이 필요하다. 그리고 향후 손실발생사업 발생시의 처리 기준과 분양형 사업방식 중심에 대한 정책 방향 설정이 필요하다. Recently, development projects by environmental improvement funds have been rapidly growing as a renovation project of aging industrial complexes. The objective of this paper is to analyze real estate development projects caused by fund investments and to derive key features and improvement measures for continuous development. As a result of the analysis, the main characteristics of the operation of the development project are as follows: First, public characteristics of funds increase the stability of the project due to the high ratio of private investment and the capital ratio of SPC. Second, pre-sale products such as the Knowledge Industry Center account for a high proportion in fund projects. Third, the proportion of the Seoul Metropolitan Area is high in fund projects. For the continuous development of the fund projects, measures to increase the credibility of private developers and efforts to bridge the gap between regions are needed. And in the future, it is necessary to set the criteria for handling loss-generating businesses and a policy direction to pre-sale development projects.
Son, Hyeonwi,Baek, Ji Hyeong,Go, Bok Soon,Jung, Doo-hyuk,Sontakke, Sneha B.,Chung, Hye Jin,Lee, Dong Hoon,Roh, Gu Seob,Kang, Sang Soo,Cho, Gyeong Jae,Choi, Wan Sung,Lee, Dong Kun,Kim, Hyun Joon Elsevier 2018 NEUROPHARMACOLOGY - Vol.143 No.-
<P><B>Abstract</B></P> <P>Emerging evidence has shown the low levels of glutamate (Glu) and glutamine (Gln) and the hypoactivity in the cortex of patients with depression. The hypoactivity is closely related with low frequency of glutamatergic signaling that is affected by the levels of Glu and Gln. Thus, we hypothesized that there might be a causality among low levels of Glu and Gln, hypoactive glutamatergic neurotransmissions, and depressive behaviors. Here, we found low Glu and Gln levels and low frequency of spontaneous excitatory postsynaptic current (sEPSC) of glutamatergic neurons in the medial prefrontal cortex (mPFC) of chronic immobilization stress (CIS)-induced depressed mice. The depressed mice also showed hypoactive Gln synthetase (GS). Inhibition of GS by methionine sulfoximine (MSO) decreased Glu and Gln levels and increased depressive behaviors with low frequency of sEPSC in the mPFC, indicating that Glu and Gln decrements cause hypoactive glutamatergic neurotransmissions and depressive behaviors. Both Glu and Gln could increase sEPSC of glutamatergic neurons in the mPFC on slice patch, but only Gln overcame MSO to increase sEPSC, suggesting that exogenous Gln would recover CIS-induced low frequency of sEPSC caused by hypoactive GS and act as an antidepressant. Expectedly, Gln supplementation showed antidepressant effects against CIS; it increased glutamatergic neurotransmissions with Glu and Gln increment in the mPFC and attenuated depressive behaviors. Moreover, selective glutamatergic activation in the mPFC by optogenetics decreased depressive behavior. In conclusion, depressive behaviors evoked by chronic stress were due to hypoactive glutamatergic neurons in the mPFC caused by low levels of Glu and Gln, and exogenous Gln can be used as an alternative antidepressant to increase glutamatergic neurotransmission.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chronic stress decreased GS activity and Glu and Gln levels in the mPFC. </LI> <LI> Chronic stress reduced glutamatergic sEPSCs but not sIPSCs in the mPFC. </LI> <LI> GS activity inhibition resulted in the similar phenotype of chronic stress. </LI> <LI> Gln increased glutamatergic sEPSCs regardless of GS inhibition on a slice. </LI> <LI> Gln increased Glu and Gln levels and sEPSCs in the mPFC against chronic stress. </LI> </UL> </P>