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The Problem of Identification in Hedonic Model
김경택 제주대학교 환경연구소 1997 환경연구논문집 : 제주대 Vol.5 No.-
The paper analyzed the identification problem. If the hedonic price function is nonlinear, then there is a price variation for characteristics. thus, both implicit prices and quantities of attributes since they are jointly chosen. This is what we called the simultaneous equation bias. In order to solve this problem, Mendelsohn suggested using predicted marginal prices for demand estimation. In other words, exogeneous marginal price variation is needed. Furthermore, in a single market it is necessary to restrict the functional form of the hedonic equation to identify the demand equation. Diamond and Smith suggested the use of market segmentation as a solution of the identification problem. Thus, market segmentation wil allow the next step of demand estimation. To account for possible interactions among the demands for characteristics, a demand system for housing characteristics is specified. A flexible functional form, the LA/AIDS, is used for empirical demand analysis.
하우스 장미 切花裁培 技術確立에 관한 硏究 : II. 切花的 장미의 消費需要 豫測 II. Forecasts of Consumption Demand for Cut Flowers
金璟宅 濟州大學校 亞熱帶農嶪硏究所 1992 亞熱帶農業硏究 Vol.9 No.-
The research objective is to furnish information on how consumption of cut flowers is affected by certain variables, in particular, per capita Gross National Product (GNP). Such information could be used to farmers and public officers whether to supply cut flowers more efficiently in the near future. To meet this research objective, the double log functional form was used to measure the value of cut- flower consumption. In this research we assume that only one variable affect to the other variable, the consumption of cut flowers, ceteris paribus. Using the annual time-series data over the period 1975 to 1991. the cut flowers consumption was regressed on per capita GNP which is an explanatory variable. The t-ratio from regression is 18.78, allowing us to reject the null hypothesis. The results showed that the income elasticity for cut flowers consumption is 3.24 suggesting that a one percent increase of the per capita GNP would increase the cut-flower consumption for each person by 3.24 percent. The estimated coefficients of the model were used to generate an ex post forecast over the ten-year period, from 1993 to 2002. The cut-flower consumption for each person will increase by 2,120 won and 11,422 won in 1993 and 2002 respectively. Forecasts for the next ten years are presented in Table 5. The results indicate that with a persistent increase in per capita GNP the cut-flower consumption will increase continuously.
UR타결에 따른 농산물 시장개방이 제주농업에 미치는 영향
김경택 濟州大學校 亞熱帶農業硏究所 1995 亞熱帶農業硏究 Vol.12 No.-
The paper has reviewed the major contents of the Agreement of Uruguay Round in the agricultural sector. And also it has calculated the amount of damage in Cheju Island, caused by the market liberalization for the period of between 1995 and 2001 by using the material published by Korea Rural Economic Institute. From the result of market liberalization it was found that mandarine, beef, sweet potato, pork, and potato are most severely damaged crops. The amount of damage for mandarine is 79.5 billion won, and beef 46.4 billion won, sweet potato 46 billion won, pork 42 billion won, potato 40 billion won, and so forth. Total amount of damage due to the market liberalization for the Cheju farm household is 1,041 billion won. The amount of damage per farm houshold in Cheju Island is 2.5 million won which is the biggest amount of damage in the nation. In fact, the amount of damage caused by the market liberalization for cheju agricultural industry is five times more than Kangwon province.
김경택,강동일 濟州大學校亞熱帶農業硏究所 1996 亞熱帶農業硏究 Vol.13 No.-
SummaryThe overall objective of the reseach is to study the status and problems for the joint sale and to examine the plan to activate the joint sale.Recently the market condition for the Citrus Industry has been changed by the import liberalization. As a counterplan it is needed to improve the market negotiation power through the activation of joint sale. At this moment, however, the joint sale has not been used in the Citrus Industry because of the difficulty of application. In order to activate the joint sale it will be necessary to improve the marketing structure, to change the recognization and attitude of the Agricutural Cooperative and producers, and to establish the system of comprehensive information for the Citrus Industry.
WWW상에서 음란물 검색기법 : Obscene Material Searching Method in WWW
노경택,김경우,이기영,김규호 韓國컴퓨터情報學會 1999 韓國컴퓨터情報學會論文誌 Vol.4 No.2
WWW은 기존의 인터넷이 단순 문자 자료 중심의 데이타 교환을 멀티미디어화 하기 위한 프로토콜이며, 자료들을 하이퍼텍스트 형태로 저장함으로써 초보자들도 쉽게 원하는 자료를 찾고, 접근할 수 있도록 되어 있다. 이러한 WWW의 멀티미디어 데이타의 검색 및 접근의 용이성은 음란물 데이타가 보편화, 멀티미디어화 되는데 결정적인 역할을 하였으며 음란물의 상업화를 가능케 하는 사회적 문제를 야기하였다. 한편, 이러한 문제를 해결하기 위해 음란물을 제공하는 사이트를 효율적으로 차단하기 연구가 활발하게 진행되고 있다. 본 논문에서는 이러한 음란물을 제공하는 사이트를 효율적으로 검색하여, 미성년자의 음란성 사이트 접근을 차단하기 위한 기법을 제시하고 이를 구현하였다. 제안된 기법은 링크를 기반으로 정보 검색 기능을 수행하며, 가장 정확한 결과를 보여 주는 것으로 알려진 확률 모델과 비교한 결과 제안된 모델(Link-Based Model)이 확률 모델보다 평균 재현율과 정확율에서 12%와 8% 성능이 우수하였다. 특히 텍스트 이외의 데이타와 적은 링크를 가진 문서들을 검색하는데 크게 효율성이 향상되었다. World-Wide Web(WWW) is a protocol for changing information exchanges which is central to text documents in the existing network to make a multimedia data exchanges. It is possible for a beginner to search and access data which he wants to find as data were stored in the form of hypertext. The easiness for searching and accessing the multimedia data in WWW makes a important role for obscene materials to be toward generalization and multimedia and occurs social problems for them to be commercialized, while other researchers have actively studied the way to block effectively the site providing obscene materials for solving such problems. This paper presents and implements the blocking method for the sites having obscene material as it effectively search them. The proposed model was based on Link-Based information retrieval method and proved that it accomplished more efficient retrieval of relevant documents than probabilistic model when compared the one with the other which is known to generate the most correct results. The improvements in the average recall and precision ratio were shown as 12% and 8% respectively. Especially, the retrieval capability of relevant documents which include non-text data and have a few links increased high]y.