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김성섭(Kim, Seongsup),김태후(Kim, Taehoo),서상택(Seo, Sangtaek) 한국농식품정책학회 2020 농업경영정책연구 Vol.47 No.2
This study sets up a Bonus-Malus System (BMS) in Korean crop insurance to resolve a double loaded penalty in current BMS. The BMS in this study adopts the model suggested by Frangos and Vrontos (2001) with Bayes’ theorem, where initial premium rate is determined by prior distribution but is updated with the loss experience by individual farmers with lapse of time. The concept of fairness suggested by Heras, Vilar and Gil (2002) is adopted to support the BMS developed. For the study, crop insurance data including premium, indemnity and frequency of occurrence provided by NH Property & Casualty Insurance Corporation (the insurer) are used. Among the crops insured only apple and pear are chosen because the two crops have the longest history of crop insurance and ranks the highest insured rate during the program period.
공상택(SangTaek Kong),김동휘(DongHwi Kim),김어진(EoJin Kim),박희지(Huiji Park),조유정(Yujung Cho),최민규(Minkyoo Choi) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
대부분의 사람들은 길안내에 중점을 둔 기존의 산책로 안내 서비스를 불편함 없이 이용할 수 있다. 하지만 교통약자들은 다양한 불편 요소들로 인해 산책과 가벼운 걷기 활동에 어려움을 겪는다. 본 논문에서는 이와 같은 문제를 해결하고자 교통약자들의 안전한 산책을 도와주고, 건강을 증진시키는 앱 서비스 ‘늘솔길’을 설계한다. Most people can use the existing application, providing walking courses, that focuses on directions. However, people with reduced mobility have difficulties in walking due to various factors. To solve this problem, we designed an application service that helps people with reduced mobility to take a safe walk and promotes their health.
스튜던트 T 코퓰라 모델을 이용한 지역별 쌀 생산량의 공간적 종속성 추정
김태후 ( Taehoo Kim ),김성섭 ( Seongsup Kim ),서상택 ( Sangtaek Seo ) 한국농업경제학회 2017 KOREAN JOURNAL OF AGRICULTURAL ECONOMICS(KJAT) Vol.58 No.3
This study aims to estimate spatial dependence for rice production yield among eight provinces in South Korea. Student’s T copula is used to estimate the spatial dependence and tail dependence. Yearly historical rice production yield data(1960-2016) for eight provinces are de-trended and normalized as year 2016 to estimate spatial dependence and tail dependence. The result shows that rice production yields for most provinces are strongly correlated to each other. Also, tail dependence shows a strong relationship for each other except some provinces. This implies that crop insurance programs should be partly supported by government due to the possibility of high systemic risk. In addition, regional production yield risk modelling imposing the spatial dependence is proper than an unified aggregate risk modelling.
목재펠릿시스템의 대체투자 가능성 분석 - 시설과채 사례 -
김성섭(Seongsup Kim),김태후(Taehoo Kim),서상택(Sangtaek Seo) 한국농촌지도학회 2018 농촌지도와 개발 Vol.25 No.3
This study aim ed to analyze the replacem ent investm ent of the diesel fuel system w ith the pallet fuel system in the Korean farm ing sector. Equivalent annual annuity approach w as used to resolve a discrepancy of useful life in capital goods and to facilitate investm ent analyses in an independent perspective. D ata w as obtained from previous studies on econom ic analysis of greenhouse tom ato, paprika and cucum ber. Results show ed that the replacem ent w ith the pallet fuel system w as acceptable irrespective of the rem aining period of useful life for the diesel fuel system . In addition, sensitivity analysis w ith governm ent support level, repair cost, and light and heat energy cost show ed robustness in the possibility of replacem ent w ith the pallet fuel system w hile the speed of replacem ent w as accelerated w ith an increase in the am ount of diesel fuel used and price of diesel fuel, and a decrease in price of the pallet fuel. The result im plied that the replacem ent investm ent rather than a new investm ent w as appropriate for existing greenhouse farm ers and the pallet fuel system w as acceptable to replace existing diesel fuel system in producing greenhouse tom ato, paprika and cucum ber.
김태후 ( Taehoo Kim ),김성섭 ( Seongsup Kim ),서상택 ( Sangtaek Seo ) 한국농업경제학회 2017 農業經濟硏究 Vol.58 No.1
The objective of this study is to suggest an alternative of the current farmer insurance program by adjusting coverage levels for each insurance provision without the increase in the premium. In order to adjust farmer insurance coverage levels, “What-If” analysis with Monte-Carlo simulations and nonlinear optimization was conducted. Empirical insurance data with seven years(2009-2015) were used to perform the “What-If” analysis. The results show that if the death and disability payments of type 2 and type 3 were fixed to type 1, farmers could receive the adjusted off-work benefits of 2.37 and 3.73 times on average compared to the current the off-work benefits without the increase in premium. This adjusted off-work benefits for man(woman) is calculated as 67(105)% for type 2, 99(159)% for type 3 compared to the off-work benefits of the worker`s compensation insurance(agricultural sector). This implies that the enhancement of off-work benefits could help farmers to manage more stable farming.
김기선,최우형,공수정,전숭종,김재현,오상택,김동은,Kim Ki-Sun,Choi Woo-Hyung,Gong Soo-Jung,Jeon Sung-Jong,Kim Jae Hyun,Oh Sangtaek,Kim Dong-Eun Korean Society of Life Science 2005 생명과학회지 Vol.15 No.5
세포 내에서 매우 적은 양으로 존재하는 RNA 전사체와 기능적으로 동일하거나 비슷한 RNA를 RNA 중합효소를 써서 in vitro에서 생화학적으로 의미 있는 양 만큼을 합성할 수 있다. T7 RNA중합효소를 발현하는 재조합 유전자를 지닌 대장균주 BL21/pAR1219로부터 순수한 T7 RNA중합효소를 손쉽게 얻는 방법을 본 논문에서 소개한다. 황산암모늄 분획화와 sephadex SP 컬럼 크로마토그래피법으로써 여타의 방법과 비교하여 더 간단하고 빠르게, 그리고 경제적으로 T7 RNA 중합효소를 분리할 수 있었다. 정제된 T7 RNA중합효소를 이용하여 보통의 화학적 합성법으로 불가능한 긴 길이(1.54 kb)의 RNA전사체를 합성 하였다. 한편,정제된 T7 RNA중합효소에 의해 생성된 망치머리 리보자임은 표적 RNA를 in vitro에서 절단함으로써, 생성된 RNA가 생화학적 기능성을 유지한다는 것을 입증하였다 따라서 본 연구에서 소개되는 절차들은 다양한 길이의 RNA를 목적에 따라 간단하고 경제적으로 합성하는데 유용하게 이용될 수 있다. Biochemical amounts of RNA molecules can be synthesized in vitro, which is functionally equivalent or similar to those transcripts normally existing at extremely low levels in vivo. In this study we described a method for efficient preparation of pure T7 RNA polymerase from Escherichia coli strain BL21/pAR1219. The procedure, which used ammonium sulfate fractionation and preparative column chromatography on sephadex SP, was shown to be simple, rapid, and cost effective in comparison with other methods reported previously, Using the purified T7 RNA polymerase we were able to synthesize very long RNA transcript of 1.54 kb length, which is not feasible by conventional chemical synthesis. RNA molecule that was also synthesized by the purified T7 RNA polymerase, such as hammerhead ribozyme, retained its biochemical activity by cleaving the target RNA successfully in vitro. Thus, the procedure shown in this study can be useful to synthesize any length of RNA molecules in vitro in a simple and cost effective way for a variety of purposes.