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Comparing Methods to Select Functional Form in Dichotomous Choice Contingent Valuation Methods
이희찬,Lee, Hee-Chan 한국환경경제학회 2001 자원·환경경제연구 Vol.10 No.1
본 논문의 목적은 양분선택질문형 비시장가치평가법을 통한 편익추정에 사용되는 제 함수의 적합성 여부를 검증하기 위해 사용될 수 있는 방법론들을 비교 검토하는 것이다. 여가수렵의 환경적 요인의 변화에 따른 편익추정에 사용된 함수의 적합성을 판단하기 위해 변이계수접근법, 함수설정 오류 테스트, 그리고 비모수접근법 등이 각 함수에 적용되었다. 결과에 따르면, 편익추정에 이용된 세 가지 로짓함수(선형, 로그, 쉐어모형) 모두 적합한 것으로 판정되었다. 주어진 함수형태에 적용된 세 방법론간에 밀접한 일치성을 보였으며 경우에 따라서는 상호보완적이라는 함축성을 보이기도 하였다 이와 같은 결론은 로짓함수로부터 추정된 값들에 Krinsky-Robb 시뮬레이션을 이용하여 구축한 신뢰구간의 함수간 비교를 통해서도 확인되었다. 주어진 환경 시나리오에 대해 각 함수로부터 도출된 평균 추정치의 신뢰구간이 모두 충분히 중복되었기 때문에 편익추정과 관련하여 함수형태간에 유의적 차이가 없음이 입증된 것이다.
반도체 배선용 저 유전 물질에서의 구리 확산에 대한 전기적 신뢰성 평가
이희찬,주영창,노현욱,윤도영,이진규,차국헌,Lee Hee-Chan,Joo Young-Chang,Ro Hyun-Wook,Yoon Do-Young,Lee Jin-kyu,Char Kook-Heon 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.3
PMSSQ (Poly Methyl Silsesquioxane)-based matrix에 BTMSE (Bis Tri Methoxy Silyl Ethane) 를 첨가한 low-k물질의 전기적 특성을 조사하였다. 우리는 절연체로 copolymer를 사용하여 금속-절연체 -실리콘 구조를 만들고 BTS 실험을 통하여 누설 전류와 파괴 시간을 측정하였다. 코 폴리머의 기공이 $30\%$ 이상이 되었을 때, 파괴 시간이 급속하게 감소되어 진다. 온도에 관하여 파괴 시간으로부터 코 폴리머를 통한 구리 확산의 활성화 에너지는 1.51eV가 측정되었다. We investigated the electrical properties of copolymer low-k materials that are compromised of the PMSSQ(Poly Methyl Silsesquioxane)-based matrix with the BTMSE (Bis Tri Methoxy Silyl Ethane) additives. We manufactured MIS-type test samples using the copolymer as the insulator and measured their leakage current and failure time by means of the BTS (bias-temperature-stress) test. The failure time was observed to decrease drastically when the porosity of the copolymer was increased over $30\%$. From the measurement of failure time with respect to temperature. the activation energy of Cu drift through the copolymer was calculated to be 1.51 eV.
이희찬(Lee Hee-Chan) 한국농어촌관광학회 2003 농어촌관광연구 Vol.10 No.1
This article investigates the determinants of rural tourism demand using a Tobit model which assumes all consumers are potential visitors and that visit levels and tourism participation are influenced by the same variables in the same way. On the basis of the results, the important variables influencing the demand are amenity role of rural multi-functionality, rural multi-functionality as a bequest value, willingness to pay for rurality, cultural tourism as an alternative, place of childhood, income, occupation, and variables associated with where individuals live, as surrogates for travel cost. Decomposition of the Tobit marginal effects indicates the market participation response is more important than the quantity factor.<br/>
이희찬(Hee-Chan Lee) 한국농어촌관광학회 2007 농어촌관광연구 Vol.14 No.1
The purpose of this study was to estimate the optimum level of population in rural areas in Korea. Two approaches used for supporting the estimation procedure were to forecast rural population in order to find the structural characteristics of rural population trend and to classify over-depopulation areas using depopulation ratio and age ratio above 65 years old. The logistic distribution was found in rural population trend as extrapolating to year 2020. Around 20% of rural population over the entire population was continued as a stable inflection on the distribution. The over-depopulation classifying identified 571 counties as the stable regions where the level of population had been maintained properly. The average level of population in the stable regions was generalized to the overall counties in order to yield the rural population of 21.4% out of the entire population as an optimum ratio of population in rural areas. On the basis of the results, the study suggested that around 20% of the national population is the optimum level for the rural population.
컨테이너 선사의 정보제공서비스에 대한 화주의 만족도에 관한 연구
이희찬(Hee-Chan Lee),노진호(Jin-Ho Noh),김두리(Du-Ri Kim) 한국관세학회 2013 관세학회지 Vol.14 No.1
As shipping companies depend on demands from shippers while shippers depend on shipping company’s supply of transportation, they could benefit from each other only if they maintain close mutual cooperation. Above all, the utilization of information technology will have great influence on the service quality. On the other hand, besides information technology, it is important for ship owners to identify exactly what sort of information customer really wants and needs. This study aims to analyze the significance and satisfaction of shipping companies and shippers so that the problems resulting from the different recognition of the two parties could be deduced, and to change attitudes and to strengthen the capability of information provision and sharing in order to improve their relations.
이희찬(Lee Hee-chan) 한국해양수산개발원 2009 해양정책연구 Vol.24 No.1
Data used in inland water fish demand modeling were characterized by the fact that demand frequencies were non-negative integers. Another issue potentially important for modeling the demand for inland water fishes was the separation of decision to participate from the decision of how many to consume. This paper aimed to analyze the determinants of inland water fish demand in terms of combining a binary probability model for participation and a conditional probability model for positive frequencies. Logit and truncated negative binomial models were utilized to apply for the participation and consumption decisions, respectively. The impact of demographic characteristics on participation decision for inland water fishes appeared to be significantly high in gender, age, and education. As regional characteristics, a notable fact was that the residents of Ulsan, Busan, and Greater Seoul exceeded those of other cities in participation rate for consuming the fishes. Types of perception on inland water fishes also had significant correlations with participation decision. The influence of demographic characteristics on the consumption decision was statistically significant in gender, age, income, and types of job. The residents of Incheon, Daejeon, and Daegu were exceeded by those of other cities in number of consumption. The impact of certain types of perception on consumption decision appeared to be significant. Taste and sanitary thought on the fishes as a choice characteristics was also significant in deciding how many to consume.
이희찬(Hee-Chan Lee),김현(Kim Hyun) 한국농어촌관광학회 2006 농어촌관광연구 Vol.13 No.2
One purpose of this study is to work out an alternatives to remain proper level of the rural population by analysing the potential demand of urban people hoping migration to rural area, point of view of building up settlement circumstances for the influx of the city people. To accomplish an aim of the study, an author executed cluster analysis by push-pull factor that offects urban people' decision making of moving to rural area and five groups were classified The other aim of this study is to examine if there is a difference among groups segmented by both the restriction dimension and promotion dimension.