• Knowledge Management Research
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• v.16 no.3
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• pp.149-169
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• 2015

In this study, we try to understand the role of online social recommendation and the similarity of preferences between the recommender and the recommendee on consumer decisions in the framework of the two stage purchase decision-making process. Applying construal level theory to our context, we expect that the role of social recommendation and the similarity of preferences would vary over the stages in the two-stage decision making process. To test our hypotheses, we collected the data through an incentive compatible experiment, and analyzed the data with nested logit model. As a result, we found that the role of online social recommendation varies over the stages. Consumers take recommendation from similar others at the stage of consideration set formation, but no longer consider it at the stage of final choice. Consumers take recommendation from dissimilar others at the stage of consideration set formation. At the stage of final choice, however, consumers avoid choosing the option recommended by dissimilar others. The results of our study enrich the understanding about the role of social recommendation, and have implication to marketing practitioners who attempt to make online social recommendation system more efficient.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.547-550
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• 2008

인터넷 서비스가 차별화 되어야 한다는 논의는 인터넷이 본격적으로 상용화된 1990넌대 중반부터 꾸준하게 제기되어 왔다. Tragedy of commons 라고 불리는 인터넷 혼잡현상은 지속적인 기술발전으로 인해서 상당부분 해결되었으나, 최근 들어서는, Web 2.0의 등장을 통해 동영상 파일이 차지하는 비중이 늘어나면서 P2P를 통한 파일교환이 전체 인터넷 트래픽의 상당 부분을 차지하면서, 또한 실시간 미디어, VoIP 등의 인터넷 응용 프로그램 등에서 전송상의 지연을 포함한 QoS 보장을 요구하게 되면서, 또한 통신사업자의 망중립성에 관한 논의가 진행되면서, 인터넷 서비스를 차별화하고, 통제하려는 연구의 중요성이 증대되고 있다. 본 연구는 인터넷 서비스를 차별화하기 위한 수단으로 기존에 제시되어온 자격과 우선순위라는 2개의 차원에서 그리고 가격제도로서 종가제와 종량제의 차원에서 배경을 검토해본 다음, 우선 대기열 이론과 혼잡성 제어 이론을 통해서 차별화된 서비스가 전체 시스템에어떤 구체적으로 효익을 가져오는 지를 검토하며, 우선순위와 사용시간에 따라 차별화되는 종량제가 현실에서 발견되지 않는 이유에 대한 이론적인 근거를 제시하고, 종량제를 채택했을 경우에 발생하는 문제점과 종량제 사용에서 발생하는 한계들을 논의하면서, 현실적으로 종량제와 차별가격을 도입할 때 발생할 수 있는 문제점들을 밝혀본다.

• International Area Studies Review
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• v.15 no.1
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• pp.59-86
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• 2011

This paper examines a country's strategic optimal tariff policy against a foreign firm with market power. That is, the purpose of the paper is, under asymmetric information, to reexamine the problem of optimal tariff policy against a foreign monopolist from another country's welfare standpoint. This is to extend the analysis of Brander and Spencer(1984) which is both analytic and elaborate. The incentive compatible tariff schedule is derived, and then policy implications are investigated. The main result is that, under incomplete information, the optimal tariff is elevated above its full-information counterpart in order to capture foreign rents. Moreover, it suggests that trade policies motivated by rent extraction are unlikely to be robust to the introduction of incomplete information. This research complements an existing literature on the strategic trade policy in terms of asymmetric information.

• Korea journal of population studies
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• v.11 no.1
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• pp.76-86
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• 1988

The primary objective of this study was to estimate the level of infant mortality rate and to find the cause of infant deaths prevailed in 1981~86 from vital registration data. In the course of that undertaking we have considered the non-registered portion of infant deaths especially for the non-registered portion of neonatal deaths. The main reason is that deaths occurring in the neonatal period and prior to the registration of the birth leave little incentive for the registration of either the birth or the death. From several ad-hoc survey's results and other countries' experiences it was, however, found that the proportion of neonatal deaths was 69.3%, the proportion of deaths in the period of first month in infanty was 7%, and the proportion of deaths in the period of 2 months and over in infancy was 23.7% respectivily. Thus, adoption the hypothesis that post-neonatal mortality is completly registered, we obtained the extimated number of infant deaths. Attempt to test the hypothesis was also made using the Brougeois- Pichats's function. The result was that the registered number of deaths in the post-neonatal period is almost compatible with the expected number. The major finding in this study was that the level of infant mortality rate in Korea was 19 per thousand live births in 1981 and 13 in 1986. This level of 1986 was almost identical with the level of Japan in 1970. It was also found that there was a difference in the level of infant mortality rate between sexes during 1981-83 but the difference was disappeared in 1985-86. Looking into the cause of infant deaths, it was found from registration that 21.2% of all infant deaths was due to congenital snomalies, 11.5% was due to pneumonia and 5.1% was due to the conditions originating in the perinatal period in that order. This pattern seems to be different with that of U.S.A., Japan and France. However, if we consider the non-registered neo-natal deaths, the order of the cause of infant deaths in Korea will be the same as compared countries. Finally, every efforts should should be made to obtain a good quality of data on infant mortality, making the non-registered events reported completely through hospitals.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.2
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• pp.130-142
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• 2014

The Korean government is considering implementation of the marine ecosystem restoration technology program (MERTP) to analyze the current status of the marine ecosystems and causes for the ecosystem deterioration as well as to eventually establish a master strategic plan for restoring ecosystem functions and preventing ecosystem functional loss. In order to determine likelihood of successful implementation, it is essential to perform an analysis of the economic feasibility of the program. The present study assessed economic feasibility of the MERTP. To this end, the dichotomous choice contingent valuation (CV) method is used. In particular, dichotomous choice (DC) format is employed as a method of eliciting willingness-to-pay (WTP) response to incentive-compatible mechanisms. The study also employed the spike model to deal with zero WTP responses from the DC CV survey. This survey of 1,000 randomly selected households in accordance with the guidelines provided by the National Oceanic and Atmospheric Administration (USA) was carried out nationwide in 2013. And, the respondents were asked in person-to-person interviews about their WTP for implementing the MERTP. The results showed that the annual mean WTP was estimated to be 5,414 won per household. Consequently, the annual benefit from the MERTP would be about 98.6 billion won for the next five years. Economic feasibility assessment utilizing the MERTP investment cost and expansion cost of the value provided that net present value, benefit/cost ratio, and internal rate of return are 337.8 billion won, 5.20, and 65.9 %, respectively, which are bigger than 0, 1.0, and 5.5 %, and that the MERTP passes the cost-benefit analysis.