Korea Rural Economic Institute

Seoul, South Korea

Korea Rural Economic Institute

Seoul, South Korea

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Lee B.-H.,Korea Rural Economic Institute | Lee B.-H.,Oklahoma State University | Kenkel P.,Oklahoma State University | Brorsen B.W.,Oklahoma State University
Agricultural and Forest Meteorology | Year: 2013

County wheat yield and wheat quality are forecast using weather information. Regression models are estimated to account for the effect of weather on county wheat yield, protein, and test weight. The explanatory variables include precipitation and temperature for growing periods that correspond to biological wheat development stages. Wheat yield, protein, and test weight are strongly influenced by weather. The forecasting power of the yield and protein models is enhanced by adding a spatial lag effect. Out of sample forecasting tests confirm the models' usefulness in predicting wheat yield and wheat quality. © 2012 Elsevier B.V.

Cho J.,Korea Rural Economic Institute | Cho J.,Cornell University | Tauer L.W.,Cornell University | Schukken Y.H.,Cornell University | And 3 more authors.
Canadian Journal of Agricultural Economics | Year: 2013

Johne's disease (JD), or paratuberculosis, is an incurable and infectious disease of ruminants, caused by infection with Mycobacterium avium ssp. paratuberculosis (MAP), and costing an estimated CAD$15 million in Canada and US$200-$250 million in the United States. This study examines the economic and epidemiological consequences of various MAP control options in the context of controlling JD in dairy herds. A discrete optimal control model is developed utilizing the disease-specific animal compartment model and maximizing the net present value of a dairy operation. The results identify the optimal control option together with the associated herd dynamics and optimal culling rates of cows in different infection states. The results show that comprehensive, effective, and profitable JD control programs can be developed for dairy farms. La maladie de Johne, ou paratuberculose, est une maladie contagieuse incurable des ruminants causée par la bactérie Mycobacterium avium ssp. paratuberculosis (MAP), qui entrai{dotless}̂ne des coûts de près 15 millions de dollars au Canada et de 200 millions á 250 millions de dollars aux États-Unis. La présente étude examine les répercussions économiques et épidémiologiques de divers moyens utilisés pour contrôler la bactérie MAP afin de mai{dotless}̂triser la maladie de Johne dans les troupeaux laitiers. Nous avons mis au point un modèle de contrôle optimal discret en utilisant le modèle compartimental spécifique á la maladie et en maximisant la valeur actualisée nette (VAN) d'une exploitation laitière. Les résultats déterminent l'option de contrôle optimal associée au fonctionnement dynamique du troupeau et aux taux de réforme optimal des vaches selon divers stades de la maladie. Les résultats indiquent qu'il est possible d'élaborer des programmes très complets, efficaces et rentables pour mai{dotless}̂triser la maladie de Johne dans les troupeaux laitiers. © 2012 Canadian Agricultural Economics Society.

Han J.H.,Korea Rural Economic Institute | Ahn B.-I.,Korea University
Agricultural Economics (Czech Republic) | Year: 2015

In order to derive the evidence of the asymmetric price transmission, we employed the threshold estimation for the price relationship between the imported wheat and the wheat flour prices. We estimated the exact level of threshold points of the imported wheat price that have different impacts on the Korean wheat flour price. Our empirical estimations proved the main hypothesis of this study, namely, that the impact of input price on output price is stronger at higher levels of the input price. In the sub-sample, which includes data from January 1993 to January 2008, the price transmission effect from the imported wheat to the domestic wheat flour in the Regime 3, in which wheat prices are the highest among our three regimes, is larger than that in the Regime 2. In the whole sample, which includes data from January 1993 to March 2014, the price transmission effect in the Regime 3 is larger than that in the Regime 2, and that of the Regime 2 is larger than that of the Regime 1. © 2015, Agricultural Economics. All rights reserved.

Lee S.H.,Korea Rural Economic Institute | Han D.B.,Korea University | Caputo V.,Korea University | Nayga R.M.,Korea University | Nayga R.M.,University of Arkansas
Canadian Journal of Agricultural Economics | Year: 2015

Reducing intakes of salt can help decrease a person's risk of heart-related chronic diseases. This study utilized a nonhypothetical choice experiment (with some hypothetical product options) to examine consumers' valuation for "Reduced Salt" canned ham in Korea. This study analyzed different sources of heterogeneity, such as correlation across utilities, income effects, and risk preferences, by estimating four different specifications of the random parameters logit model. Results suggest that the range of discount needed for consumers to switch from "Reduced Salt" canned ham to standard canned ham is 274 KRW ($USD 0.24) to 313 KRW ($USD 0.28) per can, which is approximately 7.8-8.9% of the average price of a canned ham. The results also suggest that consumers prefer the canned ham using domestic pork to the canned ham using imported pork. Moreover, respondents who are highly risk averse were more likely to purchase products with domestic ingredients. © 2015 Canadian Agricultural Economics Society.

Lee J.Y.,Korea Rural Economic Institute | Han D.B.,Korea University | Nayga R.M.,University of Arkansas | Lim S.S.,Korea University
Australian Journal of Agricultural and Resource Economics | Year: 2011

The major objective of this study is to estimate Korean food shoppers' willingness to pay (WTP) for imported beef with traceability. We use an experimental elicitation method, the random nth price auction, to identify consumers' valuation for traceable imported beef. We also analyse the effect of different types of information on these valuations. Results indicate that consumers are generally willing to pay a 39 per cent premium for the traceable imported beef over similar beef without traceability. Results also suggest that in contrast to the insignificant effect of positive information, negative and two-sided information about traceability significantly reduces WTP. © 2011 The Authors. AJARE © 2011 Australian Agricultural and Resource Economics Society Inc. and Blackwell Publishing Asia Pty Ltd.

PubMed | University of Texas at Austin and Korea Rural Economic Institute
Type: | Journal: Aging & mental health | Year: 2016

Building upon the widely known link between physical and mental health, the present study explored the buffering effects of social capital (indicated by social cohesion, social ties, and safety) in the relationship between physical constraint (indicated by chronic conditions and functional disability) and mental distress (indicated by symptoms of depression and anxiety).Using data from 2,264 community-dwelling older adults in the National Social Life, Health, and Aging Project (NSHAP) Wave 2 (MThe latent constructs of physical constraint ( = .54, p < .001) and social capital ( = -.11, p < .01) not only had a direct effect on mental distress, but their interaction was also significant ( = -.26, p < .001). Subgroup analysis showed that the group with a low level of social capital had a heightened vulnerability to mental distress when faced with physical constraint, whereas the group with a high level of social capital demonstrated resilience.Findings call attention to ways to enhance older individuals social capital in efforts to promote their health and well-being.

Kim D.,Transportation Institute | Ko J.,The Seoul Institute | Park Y.,Korea Rural Economic Institute
Transportation Research Part D: Transport and Environment | Year: 2015

There are growing concerns on traffic congestion, climate change and parking problems in major cities. Faced with these concerns, policy makers have sought sustainable transportation options including electric vehicle sharing programs (EVSPs). The city of Seoul with 10 million people also has recently launched an EVSP to provide citizens with an alternative travel mode. This study attempts to explore factors affecting the EVSP participants' attitudes about car ownership and program participation. To do this, a web-based survey was conducted for the participants of the Seoul EVSP, asking their satisfaction levels for the components of the EVSP. Then, using 533 responses of 1772 EVSP members (a response rate of 30%), ordered probit models were developed for three types of attitudes: (1) willingness to dispose of a car, (2) willingness to purchase an EV and (3) willingness to continue participating in the EVSP. The estimated models suggested that participants' social and economic perspectives were the most important factors affecting the participants' attitudes. In addition, the attitudes varied depending on personal characteristics such as gender, age and income. Although this study was conducted in the early stage of an EVSP, its results are expected to provide insights into a better EVSP design. © 2015 Elsevier Ltd.

PubMed | Korea Rural Economic Institute and Texas A&M University
Type: | Journal: Scientific reports | Year: 2017

We examine the impact of current and future climate on crop mixes over space in the US. We find using historical data that temperature and precipitation are among the causal factors for shits in crop production location and mixes, with some crops being more sensitive than others. In particular, we find that when temperature rises, cotton, rice, sorghum and winter wheat are more likely to be chosen. We also find that barley, sorghum, winter wheat, spring wheat and hay are more likely to be chosen as regions become drier, and corn, cotton, rice and soybeans are more likely to be selected in wetter regions. Additionally, we assess how much of the observed crop mix shifts between 1970 and 2010 were contributed to by climate change. There we find climate explains about 7-50% of the shift in latitude, 20-36% in longitude and 4-28% of that in elevation. Finally, we estimate climate change impacts on future crop mix under CMIP5 scenarios. There we find shifts in US production regions for almost all major crops with the movement north and east. The estimates describe how the farmers respond to altering climate and can be used for planning future crop allocations.

Kim J.-J.,Korea Rural Economic Institute | Zheng X.,North Carolina State University
Journal of Agricultural and Resource Economics | Year: 2015

We propose a model that elucidates the two channels through which alternative marketing arrangements affect spot price in livestock markets. The direct effect works through their effect on demand and supply. The indirect effect works through spot price volatility, which has been ignored in the literature. We then estimate a dynamic model with data from the U.S. hog market to test our model implications and quantify the two effects. We find increases in the use of AMAs increase spot price volatility and decrease spot price level. The short-run effects are small but the long-run effects are nontrivial.

Yohan L.,Korea Rural Economic Institute | Byungdoo L.,Korea forest Research Institute | Kyung H.K.,Korea forest Research Institute
Journal of Mountain Science | Year: 2014

This study explores the optimal spatial allocation of initial attack resources for firefighting in the Republic of Korea. To improve the effectiveness of Korean initial attack resources with a range of policy goals, we create a scenario optimization model that minimizes the expected number of fires not receiving a predefined response. In this study, the predefined response indicates the number of firefighting resources that must arrive at a fire before the fire escapes and becomes a large fire. We use spatially explicit GIS-based information on the ecology, fire behavior, and economic characterizations important in Korea. The data include historical fire events in the Republic of Korea from 1991 to 2007, suppression costs, and spatial information on forest fire extent. Interviews with forest managers inform the range of objective functions and policy goals we address in the decision model. Based on the geographic data, we conduct a sensitivity analysis by varying the parameters systematically. Information on the relative importance of the components of the settings helps us to identify rules of thumb for initial attack resource allocations in particular ecological and policy settings. © Science Press and Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2014.

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