• Transportation Technology and Policy
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• v.6 no.3
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• pp.205-208
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• 2009

• Journal of Korean Society of Transportation
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• v.28 no.3
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• pp.99-107
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• 2010

Analyzing mode choice among transportation demand estimate procedures is complicated and understanding characteristics of travelers is also difficult. Generally, it is well known that traveler choose mode considering psychometric factors and characteristic besides socio-demographic indicators. Accordingly, many researches has investigated on methodology that can be applied in mode choice to reflect psychometric factor or specific preference. Latent Class Analysis among various studies is recognized as the theoretically potential approach. This study focuses on class segmented using latent class cluster to analyze impact that included psychometric factors and characteristics on mode choice. It also provides evidence that mode choice model for each class and mode choice model not considering latent class are different. This study based on citizen's stated preference and revealed preference on a new transit on the Han river shows that latent class cluster analysis is the potential approach considering latent preference.

• Journal of Korean Society of Transportation
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• v.26 no.6
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• pp.143-154
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• 2008

This paper considers option and non-use values of rail services. The total economic value of a given transport service can be classified into use, option and non-use values, other grouping rules can be applied though. The use value is the consumer's surplus from the actual rides of a specific mode. The option value, on the other hand, can be defined as a traveler's willingness to pay for reserving a travel mode, which is not his or her main choice, as a standby alternative. Finally, the non-use value represents benefits that are not attributable to the actual use or option use, but to the vicarious, altruistic, functional and existing worth of a transport service. A stated preference survey based on a double-bounded dichotomous choice is conducted. A survival model is applied to the data collected. Calculations of trip makers' willingness to pay for option and non-use values are based on the parameters of the estimated survival model. Some suggestions for transport appraisal are also presented.

• 한국IT서비스학회:학술대회논문집
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• 2007.11a
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• pp.581-586
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• 2007

정부의 IT839정책과 함께 유비쿼터스 환경이 실현되고 있는 요즘, 홈 네트워크 산업은 크게 성장하고 있는 추세이다. 이에 발맞추어 홈네트워크 산업의 활성화를 위해 정책 제안이나 현황 보고와 같은 연구들이 많이 이루어졌다. 그러나 이용자들의 입장에서 홈네트워크 서비스에 대한 관심이나 선호분포에 관한 연구는 부족하다. 따라서 븐 연구의 목적은 홈네트워크 서비스들에 대한 이용자들의 선호도를 조사하는데 있다. 이를 위해 먼저 다양한 홈네트워크 서비스들을 특성에 따라 분류한 후 잠재 이용자들을 대상으로 각 서비스에 대한 호감도를 조사하였다. 그 후 잠재 이용자들의 특성에 따라 홈네트워크 서비스들과 대응일치분석(Correspondence Analysis)을 하였다. 연구 결과 모든 잠재 이용자들이 안전관련 서비스에 높은 관심을 표하였으며 특히 고령일수록 그 관심은 더 높게 나타났다. 그리고 인터넷을 거의 사용하지 않는 집단은 홈네트워크 서비스에 낮은 관심을 보였다.

• Journal of the Korean Society for Railway
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• v.20 no.2
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• pp.288-298
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• 2017

The system of high-speed and conventional railway vehicles is diversified, and significant technological development in performance has been achieved. This study analyzed the modal change characteristics; furthermore, it estimated the value of travel time by improving the travel time and cost for the passenger's perception of railway. In this study, we formulate a mode choice model for passengers and compare it with the mixed logit model which reflects individual taste variation. In addition, the validity of the analysis is presented through an estimation the value of travel time using the derived model. For this purpose, a stated preference survey was conducted with 510 people using public transportation. The benefits of time-saving can be accurately determined by estimating the value of time spent on the railway. Appropriate fares for public transportation can also be estimated.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.269-270
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• 2017

스마트 시티에 제공되는 서비스는 기반 서비스와 특화 서비스로 나뉜다. 그 중 특화 서비스는 도시의 목적과 특성에 맞게 제공이 되는 서비스이다. 특화 서비스의 경우 각 지방자치단체에서 제공 계획을 만들고 제공을 하게 된다. 그러면 하나의 스마트 시티가 완성이 되고 생활을 하게 되면서 제공했던 서비스가 지방 자치 단체의 운영 관리의 문제 때문에 제공되는 서비스에 대한 만족도, 체감도는 낮은 것으로 보여진다. 따라서 수 많은 서비스 중 어떤 서비스가 제공 되어야 하는지를 결정을 해야 하고, 재정상 문제가 있을 경우 서비스 우선순위를 결정 하여 순차적으로 제공을 하는 것이 중요한 부분이라고 생각한다. 따라서 본 연구에서는 스마트 시티 서비스 중 특화 서비스를 대상으로 기존 스마트 시티 서비스에 대한 만족 및 선호와 잠재 수요자의 선호서비스를 조사를 하고, 그 결과를 바탕으로 현재 제공이 되고 있는 서비스와 선호 서비스의 차이점을 조사 및 분석을 하고, 기존 연구되어진 논문과 서비스 우선순위를 비교 분석을 하여, 향후 스마트 시티의 특화 서비스의 제공에 관한 계획을 할 때, 어떤 서비스 선정 결정을 하는데 도움이 될 것으로 예상된다.

• Journal of Korean Society of Transportation
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• v.28 no.4
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• pp.119-128
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• 2010

Mode choice behavior is associated with travelers' latent behavior that is an unobservable preference to travel behavior or mode characteristics. This paper specifically addresses the problem of unobservable factors, that is latent behavior, in mode choice models. Consideration of latent behavior in mode choice models reduces the errors that come from unobservable factors. In this study, the authors defined the latent variables that mean a quantitative latent behavior factors, and developed the combined RP/SP model with latent variables using the mode choice behavior survey data. The data has traveler's revealed preference of existent modes along the Han River and stated preference of new water transit on the Han River. Also, The data has travelers' latent behavior. Latent variables were defined by factor analysis using the latent behaviour data. In conclusion, it is significant that the relationship between traveler's latent behavior and mode choice behavior. In addition, the goodness-of-fit of the mode choice models with latent variables are better than the model without latent variables.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.135-136
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• 2016

최근 각종 사물인터넷 제품이 시장에 출시되면서 관련 업체들은 시장 선점을 위해 표준화 플랫폼 분야에서 경쟁을 벌이고 있다. 또한 이동통신 3사를 중심으로 가정용 사물인터넷 서비스를 앞 다투어 출시하면서 시장을 뜨겁게 달구고 있다. 대표적 출시된 서비스는 스마트홈 관련 서비스가 있다. 이동통신 기반 사물인터넷 서비스는 초기 단계에 머물고 있으며 지속적으로 다양한 서비스가 출시될 것으로 예상된다. 이러한 시점에 이미 출시된 서비스를 중심으로 사물인터넷 서비스에 대한 선호도 분석을 기획하게 되었다. 새로운 제품이나 서비스가 출시되는 경우에 잠재적인 구매자들이 제품 및 서비스가 어떠한 속성에 영향을 받아 그 제품이나 서비스를 선택하게 되는지에 대한 연구는 연구자에게 매우 흥미로운 주제이다. 따라서 문헌분석과 시장조사를 통해 사물인터넷 서비스를 고찰하여 선호도 분석 개념모델을 완성하고자 한다. 또한 이동통신 3사에 근무하는 직원(전문가)를 중심으로 설문을 통해 선호도 분석을 하고자 한다. 분석결과를 바탕으로 연구의 한계와 이론적 실무적 시사점을 제시하고자 한다.

• Journal of Food Hygiene and Safety
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• v.21 no.3
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• pp.136-144
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• 2006

This study was conducted to investigate students' food consumption including potentially hazardous food (PHF) and food preference in elementary school lunch menus. High protein foods and raw or cooked vegetable dishes in the menus for three weeks were grouped as PHF-1 and PHF-2, respectively. Three hundred eight-four children from three different elementary schools, aged 10 to 12 years, completed the questionnaire that asked them to report on how much they eat, what foods they like the most and the least, and why they did not like it. Chisquare test was used to analyze the differences among schools, Evades and genders far food consumption using the SPSS. Results showed that students were exposed to at least two kinds of PHF in school lunches per day. 89% and 82% of students ate 100% amount of PHF-1 and PHF-2, respectively. There were significant differences in the amount of food consumption by school and day served. Students preferred high protein foods, such as meat ball, pork and chicken barbecues, which were consumed the most. These data indicate that appropriate control measures or procedure is needed to manage hazards associated with PHF in the menu items to decrease the risk of foodborne illness in school lunch.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.6
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• pp.49-65
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• 2023

In response to the growing global concern for the environment, the international community has recently committed to achieving 'carbon neutrality.' As a result, numerous studies have been conducted on mode choice models that include carbon emissions as a variable. However, few studies have established a correlation between individual preferences and carbon emissions. In this study, a new mode of transportation named sustainable public transit (SPT), incorporating carbon-reducing transport options like electric scooters, is proposed. Analyzing the individual preferences of commuters on carbon emissions through factor analysis, a stated preference (SP) survey was conducted. A mode choice model for SPT was constructed using multinomial logit models. The results of the analysis showed that gender, income, and specific preferences, such as a passion for exploring new routes, a preference for intermodal transfers, knowledge of carbon reduction, and carbon reduction practices, significantly influence latent preferences for SPT. Therefore, this study is significant as it considers carbon emissions as an attribute variable during the construction of mode choice models and reflects the individual preference variables associated with carbon reduction.