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김준순 ( Joon Soon Kim ),변우혁 ( Woo Hyuk Byun ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.3
This study performed to test the differences of willingness to pay(WTP) according to the question formats, payment card format and dichotomous choice format in the contingent valuation method. The questionnaire for the valuation of the recreation benefit is performed to estimate average WTP based equivalent surplus. The model assumed a joint likelihood function on the basis of the probit and tobit model. It was used for visit frequency, satisfaction, sex, education, income as the exogenous variables, which assumed a linear form. The result showed that the estimated WTPs vary according to the question formats. The recreational benefit on Bukhansan national park was estimated about 14 billion won.
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강원도 지방 소나무의 지역 간곡선 (幹曲線) 및 재적식 (材積式) 모델
김준순,이우균,변우혁 ( Joon Soon Kim,Woo Kyun Lee,Woo Hyuk Byun ) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.4
Voume functions, which are usually expressed by the function of dbh and height, are estimated commonly through the regression analysis with the highest statistical accuracy considered. In Korea, general volume functions for each tree species were prepared by means of the regression analysis with the exponential function (V=aD^bH^c) having the dbh(D) and height(H) as independent variables. In this study, regional stem curve functions for the Pinus densiflora in Kangwon-province were derived and a regional volume function model, in which the stem eulume can be directly estimated through the rotational integral of the regional stem curve functions, was prepared. The regional volume estimated by the prepared model was more accurate than the volume by the general volume table for the Pinus densiflora in Kangwon-province. Additionary, the form of stem curves derived by the regional stem curve functions showed difference tram each other. The stem in Youngwol and Wonju taper down more fast in upper part than that in other regions. These various stem forms also led to the regional difference in volume estimates.
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