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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.
김준순 ( Joon Soon Kim ) 한국산림과학회 2005 한국산림과학회지 Vol.94 No.1
Although the forest accounts in Korea have been constructed partly as the research projects since the mid-1990s, the framework of the accounts has not yet been established. The objective of this study is to provide the physical asset accounts of forested land and forest stock based on the system of integrated environmental economic accounts(SEEA) by utilizing the restructured 2004 statistical yearbook of forestry in Korea. In 2004 yearbook, new variables such as logging area and volumes arc added. The logging area and volumes play important roles in constructing forest accounts because the basic structure of the physical asset accounts are composed of the opening stock, closing stock, and the changes between the two. The changes between the opening and closing stock are largely explained by the harvest. In forest accounts, in general, the main elements for the increase in stock are afforestation and reforestation while the main cause for the decrease is logging. In this study we separate the logging into natural or man-made causes. In addition, other useful information for the status of forest is recorded in an annex even if it is not necessary element in the account table. According to the forested land asset accounts generated with 2003 data, the logging area is larger than the relorestation area, and the total forested land is decreased. The logging volume is 0.4% of the total stock volume, and the planed logging volume is more than 3 times larger than the damaged logging volume. The damaged logging volumes by man-made causes is about 300,000 and It is much larger than that of natural causes. which is about 55.000 ㎥.
김준순 ( Joon Soon Kim ),이동근 ( Dong Kun Lee ) 한국환경복원기술학회 2014 한국환경복원기술학회지 Vol.17 No.6
The objective of this study is to estimate the cost and benefits of street trees for their planting types, specifically, single row, single row+bottom, double row, double row+bottom. Different planting types are compared and analyzed by using Net Present Value (NPV) and benefit-cost ratio (BCR). Existing data are collected from the literature reviews for the use of meta-analysis method for estimating cost and benefit. The elements for analyzing costs are management and planting costs, and benefits are air purification, energy saving and landscape view. The discount rate is applied at a minimum of 3% and a maximum of 5.5%. The unit used in this calculation is km/year. The result shows that the net benefit is highest in double row, followed by single row, double row+bottom, and single row+bottom. The BCR is the highest in double row, followed by single row, double row+bottom, and single row+bottom. The BCR reaches the break-even point from 9 to 17 years depending on the planting types.
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.
가상가치평가법에서 시간범위에 따른 휴양가치의 차이 해석
김준순(Joon Soon Kim) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.1
Consumer surplus is to be a value concerning a time horizon. Especially it is very important how long time horizon would be chosen in contingent market. This study aimed to provide causes of difference recreation benefits through discount rate in many aspects. The data were collected by personal interviews with visitors in Songnisan National Park. The respondents answered yes or no, dichotomous choice, on recreation benefits according to a chosen time horizon, one year or five years. The probit model was used in the analysis. In order to avoid the truncation bias of upper bound, the median was chosen as the recreation benefits of visitor. As the result, the value was evaluated to be 16,569 Won for one year and 27,111 Won for five years. The discount rate is estimated 153% annually to coincide different recreation benefits. The reasons of the high discount rate were to be interpreted as following five types : (1) uncertainty of future consumption (2) increasing of probability of the substitution owing to increasing of time horizon (3) recognization of different time horizons (4) effect by the price ratio of goods and utility function (5) overestimation of the recreation benefits owing to a basic premium of payment vehicle.