Oh-sang Kwon

The published empirical literature on frontier production functions is dominated by two broadly defined estimation approaches – parametric and non‐parametric. Using panel data on Korean rice production, parametric and non‐parametric production frontiers are estimated and compared with estimated productivity. The non‐parametric approach employs two alternative measures based on the Malmquist index and the Luenberger indicator, while the parametric approach is closely related to the time‐variant e

Minoxidil induces hair growth in male pattern baldness and prolongs the anagen phase. All-trans retinoic acid (ATRA) has been reported to act synergistically with minoxidil in vivo: they can enhance more dense hair regrowth than either compound alone. We evaluated the effect of minoxidil combined with ATRA on hair growth in vitro. The effect of co-treatment of minoxidil and ATRA on hair growth was studied in hair follicle organ culture. In cultured human dermal papilla cells (DPCs) and normal hu

This paper investigates the determinants of farm income in Korea. The contributions of not only individual farm household charactertics but also the regional conditions where each farm is located are identified and quantified. For the purpose, two different sets of gevernment data are combined. It is estimated that the regional conditions explain almost 14~16 percent of farm income variations. Like the case of individual characteristics, it is shown that the regional conditions contribute to fam

This study analyzes the performances of 723 marketing organizations owned by farm cooperatives or corporations in Korea, and identifies the determinants of their performances. Applying stochastic DEA and FDH techniques to various combinations of inputs and outputs, the study selects an appropriate set of input and output indices carefully. Not only revenues but also achievements with some public values are incorporated as outputs. Distributions of the measured efficiency scores are estimated, an

This study constructs quantity and price indices of input and output of Korean agriculture for the period 1971-2007. By applying a dual approach the study decomposes the change in total factor productivity into scale effect, R&D effect and technical change effect. The contribution of the scale effect to the productivity change is the largest. However, it is shown that productivity growth rates higher than the usual level are explained mostly by the investment in R&D. In that sense R&D expenditur

This study estimates the amenity value of paddy fields. Three different types of paddy fields are evaluated: cultivated paddy fields, idled paddy fields and paddy fields converted for nonagricultural purposes. A contingent ranking model has been constructed to derive the values. Various proportions of each type of paddy fields with different amounts of payment are suggested to the interviewees, and they are requested to assign a rank to each alternative. The results show that the value of preser

A multilevel/hierarchical Bayesian hedonic price function of farmland is constructed and estimated. The model employs not only parcel-specific characteristics but also various regional-specific variables such as population size, acreage, degree of industrialization and urbanization. It is shown that the regional random effects are the major determinants of farmland prices. Among the fixed effects, the variables that affect the probability of land conversion are significant determinants of land p

This study constructs quantity and price indices of Korean agriculture for the period 1971-2013, to estimate the change in total factor productivity (TFP) and identify its sources. Inputs are aggregated into capital (K), labor (L), land (A) and intermediate inputs (M). Constructed indices show that there were three stages of productivity change: the stage of high output and input growth rates (1971∼1986), the stage of low output and almost zero input growth rates (1987∼ 1997), and the stage of n

본고는 댐호수가 제공하는 휴양가치가 댐특성의 변화에 의해 어떻게 달라지는지를 추정하고자 하였다. 이 목적을 위해 실제로 댐방문행위를 분석할 수도 있으나 이 경우 주요 특성변수의 추정이 불가능하거나 어렵고 변수들간의 독립성도 약하여 통계적으로 의미있는 추정결과가 나타나기 어려운 경우가 있고, 따라서 본 연구는 대안으로 선택실험을 실시하여 수질과 수량 및 기타 특성변수의 경제적 가치를 도출하고자 하였다. 선택실험자료를 이용한 추정결과를 10개 주요 댐호수의 선택문제에 적용하여 다양한 시나리오별 특성변화의 경제적 가치를 도출하였다.분석결과 수질이 특히 민감하게 휴양가치에 영향을 미치는 것으로 나타났고, 수질이나 환경에 부의 영향을 주도록 지나치게 큰 댐을 짓거나 유람선 운행 등을 할 경우 오히려 휴양가치가 감소할 수도 있음이 보여졌다. 모든 댐의 수질이 1등급 개선될 경우 휴양객들은 자신이 댐 1회 방문을 위해 평균적으로 지불하는 비용 이상의 편익을 추가로 얻는 것으로 나타났다. 댐과 관

This study investigates the β-convergence in Korean farm income using the farm household survey data of 1998-2006. It is shown that farm household's agricultural income, off-farm income and the whole farm income all exhibit absolute and conditional convergence. We identify the farm and regional characteristics that determine the level of steady state farm income for the case of relative convergence. The speed of convergence increased over time for the cases of agricultural income and whole farm

The purpose of this study in analyzing the general equilibrium impacts of agricultural production losses that occurred in 2010 due to the abnormal weather conditions. An input-output model and a computable general equilibrium model containing a detailed specifficatio of agricultural sector are constructed and used for the analysis. It is shown that the losses generated are a decline in GDP by 0.12% and a decline in household income by 0.19%. The study also shows that the burdens to low income cl

소비자들이 실제로 선택한 행위를 분석하여 국립공원과 같은 자연생태계에 대한 수요를 분석하고 그 경제적 가치를 도출하는 대표적인 방법은 여행비용법과 이산선택모형을 이용하는 방법이다. 한국에서는 여행비용법의 적용사례는 상당히 많이 있으나, 상대적으로 많은 장점을 가짐에도 불구하고 이산선택모형을 적절히 적용한 연구사례는 아직 없는 실정이다. 본 연구는 전국적인 표본조사를 통해 18개 국립공원 가운데 방문지를 선택하는 행위를 조건부로짓모형과 계층로짓모형을 추정해 실증분석하고, 그 결과를 이용해 각 국립공원별 경제적 가치와 국립공원 특성별 경제적 가치를 도출한다.