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중력모형을 이용한 우리나라의 원당 및 정제당 수입량 결정요인 분석
강두현(Kang, Doohyun),박지원(Park, Jiwon),박성진(Park, Seongjin) 한국농식품정책학회 2021 농업경영정책연구 Vol.48 No.2
Sugar is a very important agricultural product that is finally consumed or used as an intermediate product in the Korea food industry. However, raw sugar used to make sugar cannot be produced on its own, so it is mainly imported from Australia and Thailand, and the amount imported in the last three years is 1.78 million tons. Furthermore raw sugar is sensitive to weather conditions and oil prices, making it more price variability than other grains. For these reasons, it is important for Korea to bring in sugar stably to stabilize food prices and secure raw materials. Nevertheless, there is still lack of studies on the import of sugar in Korea. Thus, the purpose of this study is analyzing the determinants of raw sugar and refined sugar import volumes in Korea using gravity model. For this purpose, we constructed the panel data set over the 2000~2019 periods and carried out a gravity model by adopting random effect panel Tobit estimation. Also, we compared the estimates with Tobit model, OLS and PPML each other. From the empirical results, all estimates ware derived theoretically appropriate. First, Korean sugar imports was increased as growing GDP. Second, the decline in sugar imports was affected by the price of sugar and Action plan for sugars reduction. Third, decreased distance and FTA were proved to be a boost in sugar imports.
강두현(Kang Doo Hyun),김성용(Kim Sung Yong) 한국농식품정책학회 2017 농업경영정책연구 Vol.44 No.3
The purpose of this paper is to analyze to changes in food expenditure patterns in the light of the age-cohort-year decomposition. Using the Korean Households Income and Expenditure Survey data from 1990 to 2015, we constructed the cohort data set by six socio-historical generations. We selected eight food categories, and carried out a Tobit estimation for each category, and then decomposed estimated parameters into age, generation, and year effects. These estimation and decomposition processes were continued for both expenditure amounts and shares of each food category. From the empirical results, we found that first, for all food categories there exist highly significant age-generation-year effects in both expenditure amounts and shares; second, younger generations spent more than older generations on the total food expenditure, processed food products and food away from home, whereas older generations spent more than younger generations on fresh food products; third, younger generations had less than older generations expenditure shares on grains, marine products, vegetables & seaweeds, whereas older generations had less than younger generations expenditure shares on meats, fruits, processed food products, and food away from home; fourth, households’ socio-economic factors have significant effects on both food expenditure amounts and shares of all food categories, and generation effects were not affected by adding various socio-economic variables into both food expenditure and share equations.
윤종열 ( Yoon Jong-yeol ),강두현 ( Kang Doo-hyun ),박기환 ( Park Ki-hwan ) 한국식품유통학회 2021 食品流通硏究 Vol.38 No.2
The study is aimed at analyzing the sales determinants of the commercial seedling industry and deriving policy implications by using survey statistics of commercial seedling industry, which is a national approval statistics. For this purpose, ordinary least square and multinomial logit model are applied. According to the analysis of the determinant of sales of the commercial seedling industry, the type of a full-time of the commercial seedling company more than 10 years of experience, education of workers and representatives over college graduates, and the possession of germination rooms are the main factors. In addition, the variables identified by the main factors are all measured in the sign of positive and are analyzed to have the effect of increasing the sales volume of the firms. As estimated by the multinomial logit model, companies with relatively large sales show significant results in the case of full-time firms. It was analyzed that the long experience and high educational background of the workers (including the representatives) of the commercial seedlings company had a significant impact on the sales. Facilities such as germination rooms, are also estimated to be a major factor in the increase in sales. Based on the analysis results, some policy implications are as follows. It is necessary to provide policy support for small businesses to leap forward into mid-sized firm. The issue of manpower supply and demand with expertise is also an important policy task to be dealt with in a significant way. Facility equipment is expensive, so it is difficult for small businesses to handle it. Therefore, it is also necessary to develop and distribute seedling facilities as well as prepare measures such as support for purchasing and installation funds.
Top-Down 공법용 무지주 거푸집 Easy Down 공법 개발
임홍철(Rhim Hong-Chul),정미라(Jeong Mee-Ra),강두현(Kang Doo-Hyun),유광준(Yoo Kwang-Jun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
For a Top-Down or Downward construction method, it is essential to provide an efficient formwork system for the placement of concrete slab. This paper presents a new slab supporting formwork system called "Easy Down" developed especially for the Top-Down construction method. The Easy Down system is designed for the support of formwork and the weight of reinforced concrete slab from the top of prefounded columns located at ground level through a hanging device. Thus, cumbersome formwork supporting mechanism is reduced or even avoided compared to the existing methods. The details of the Easy Down system and the results of mock-up tests are presented and discussed in this paper.