Joonho Ko

Electric vehicles (EVs) have been developed as an efficient solution to reduce automobile emissions. To ensure the effective diffusion of EVs in current transport systems, it is vital to understand the factors affecting consumers’ intentions to purchase EVs. To provide insights for this understanding, this study aims to investigate such factors with a particular focus on users’ attitudes and perceptions. A questionnaire survey was conducted in September 2019 among potential consumers in the majo

The recent concerns on environmental issues have expedited the technological development of alternative fuel vehicles (AFVs), but the deployment of AFVs still remains at the initial stage mainly because of the lack of refuelling facilities. Recognising this, researchers have conducted various studies, proposing a variety of approaches to strategically locating refuelling stations. This paper presents a comprehensive review of the approaches, focusing more on applications than computational issue

This study attempts to identify factors that affect carsharing program participants’ car ownership changes based on a survey addressed to carsharing members in Seoul, South Korea. The survey with more than 5000 replies reveals that about 30% of the respondents have changed or potentially would change their car ownership. Statistical models, applying dependent variables of whether members have disposed of a car and whether they intend to give up or postpone car purchases, show that members’ car o

To investigate how a pedestrian chooses a particular route in an urban center, this study analyzes the effects of individual and built environment characteristics on the route choice using binary logistic regression of 524 survey responses. Conducted in a strategic area, the survey, as often is the case, collects data that are skewed and face the separation issue—the same outcome always occurs for a particular value of a predictor—according to which estimates by the conventional maximum likeliho

As climate change and severe air pollution become life-threatening, numerous attempts have been made to encourage the use of electric vehicles as alternative fuel vehicles. One such proposal is the introduction of electric taxis supported by the battery exchange station (BES) system. This article presents the framework on how the BESs should be located in a city considering the demand and practical constraints using Seoul, South Korea, as the case study. As a solution approach, p-median models a

Traffic congestion has been one of major problems in modern cities and thus numerous measures have been taken to mitigate it. An appropriate selection of congestion mitigation strategies comes from the sound understanding of the congestion characteristics. Many researchers, thus, have tried to identify the effective ways for measuring level of congestion or roadway performance. As a result of these efforts, various approaches were developed for some specific purposes. It is, however, still neces

High-resolution vehicle speed profiles obtained from sophisticated devices such as global positioning system (GPS) receivers provide an opportunity to accurately measure intersection delay, composed of deceleration delay, stopped delay, and acceleration delay. Although the delay components can be measured by manually examining the speed profiles or derived time–space diagrams, identifying when vehicles begin to decelerate or stop accelerating is not always a straightforward task. In addition, a