Papers by Naohisa OKAMOTO
Doboku keikakugaku kenkyū, ronbunshū, 2003
Journal of the Eastern Asia Society for Transportation Studies, 2010
Japan has more than 6,000 small islands. However, almost all the islands do not have the resource... more Japan has more than 6,000 small islands. However, almost all the islands do not have the resources for developing an industry. So, tourism business is important for most of these islands to generate revenues. At present, the decreasing number of tourist is causing problems to the tourism business of the island which is often used for recreation. It is necessary to formulate the measures for tourism promotion.. Therefore, the purpose of this study is to review existing strategies. Survey was conducted to propose the strategies for tourism promotion using Sado Island as a case study. In order to objectively propose strategies, analysis of tourist activities and preference was done using the tourist survey data. In this paper, we tried to analyze the transportation mode choice behavior by discrete choice model and visitor's preference by factor analysis and discriminant analysis. Based on the analytical results, several ideas for transportation improvement and boosting strategies of recreational spots were pointed out..
Different types of road-based public transportation vehicles can be observed in many developing n... more Different types of road-based public transportation vehicles can be observed in many developing nations of Southeast Asia. For example, Thailand has its "tuktuks", Indonesia has its "bajajs" and "motos" or motorcycle taxis are familiar sight in Vietnam. In the Philippines, public utility jeepneys and tricycles are very popular. This study uses the concept of indigenous public transport modes. That is, low-occupancy, road-based motor vehicles and with unique design identifiable to its place of origin and sometimes have informal nature of operation. Thus, this paper aims to understand the different types of motor vehicles used as public transport service and in particular describe the indigenous modes by studying the public transportation system of Davao City, Philippines. A holistic planning and policy perspective is provided by understanding the history and role of different public transport modes thru its key stakeholders: government units, supply and demand using in-depth interviews and small-scale survey.
Transportation research, economics and policy, 1996
This chapter describes the development of a method for quantifying the impacts of accessibility c... more This chapter describes the development of a method for quantifying the impacts of accessibility change on land use development and the consequent reduction of green areas in suburban areas. A method of confirmative factor analysis is adopted for identifying the causalities among accessibility change, recreational attractiveness and the change of green conservation level. A theoretical model which includes the travellers' demand for natural green and the developers' strategy related to the conservation or development of green areas is proposed and is used for assessing the impact of transport improvements. For the covering abstract see IRRD 883195.
Journal of the Eastern Asia Society for Transportation Studies, 2007
This paper suggests a method in forecasting tourism. The forecasting model has two stages of esti... more This paper suggests a method in forecasting tourism. The forecasting model has two stages of estimation. First stage is the “International Trip Generation”. The paper explained this by using a logistic curve. Second, the paper will proceed to find out the travel destination by using the aggregate logit model. Results of the forecast of tourists coming to Japan led to two main conclusions: (1) the number of tourists from every Asian country shows a growing tendency until 2030; and (2) moreover, the rate of tourist visiting Japan will decrease gradually compared to other regions such as North America where the rate is steadily increasing.
Doboku gakkai ronbunshu, 2011
Journal of the Eastern Asia Society for Transportation Studies, 2010
The Tsukuba Express line commenced operations in August 2005, connecting Tsukuba city and Tokyo m... more The Tsukuba Express line commenced operations in August 2005, connecting Tsukuba city and Tokyo metropolitan, Japan. Based on the Tsukuba Express Railway Project, the transportation system includes road network and local bus network which had greatly restructured Tsukuba City and its surrounding area. The objective of this paper is to understand the impact of Tsukuba Express Railway Project on the actual travel pattern and behavior of the residents of the surrounding areas of Tsukuba Express. The study conducted panel data survey before and after Tsukuba Express' operation. Results indicated that residents' patterns and modal choices have changed significantly.
Journal of the Eastern Asia Society for Transportation Studies, 2010
to foreign visitors' travel satisfaction in terms of convenience and comfort. In this light, this... more to foreign visitors' travel satisfaction in terms of convenience and comfort. In this light, this study aims to understand 1) the relative importance of the items that define the tourism environment, and 2) how foreign visitors evaluate Japan's tourism environment. The analysis showed that foreign visitors highly prioritize Safety followed by Transportation and Price. In addition to the foreign visitor's subjective evaluation, quantitative analysis was done to certify the evaluation system of the tourism environment. The result shows that Japan has strength in the areas of affluence and social stability but has weakness in language.
Transport Policy, Mar 1, 2013
The presence of unique kinds of public transportation often described as informal characterizes m... more The presence of unique kinds of public transportation often described as informal characterizes many cities in developing countries. As often noted, people in the lower income categories are usually the ones who rely on informal public transport services. In the Philippines, one can observed that an average Filipino uses door-to-door transport services regularly. This starts from stepping out of the house, walking several paces (if at all), hailing a ''pedicab'' (bicycle with a side-cab) or tricycle (motorcycle with side-cab), to riding a public utility jeepney (PUJs) or bus, getting-off, hopping on to another ''pedicab or ''tricycle'', and getting transported right to the door of final destination. Using Davao City, Philippines as the case study area, the paper tries to explore the concept of habit and dependency on the different road-based public transport modes based on both theories of rational behavior and planned behavior. Empirical results using structural analysis show the strong public transport dependency to PUJs and tricycles where half of the household population have vehicles. It confirms the role of rational behavior where socioeconomic factors affect modal decision. Likewise, the study also shows interesting findings wherein the quality of service evaluation played a direct role in the perceived dependency to formal modes (buses, taxis) and informal mode (such as motorcycle taxis or MC taxis) but an indirect role in the actual use of the mode. The study shows the relationship of perceived reliance visa -vis trip recall using indigenous modes (PUJs, tricycles) and supports the theory that suggests the role of habits and ''mere exposure'' effect. As noted in many related studies, it is not easy to alter habits. This indicator is validated by the actual use of public transport modes especially tricycles and MC taxis for short-distance trips as well as how one views own dependency visa -vis how the same individual sees his/her household and community dependency to a certain public transport mode. These findings suggest the need to understand Filipino commuter's psychology and a careful review and understanding of the concept of sustainability, infrastructure needs, seamless multi-modal connections and overall quality of service given limited economic support in a context of an emerging city in a developing country.
Macromolecules, 1996
... wide range of temperature. The results were similar to those for poly((R)-2-deuterio-n-hexyl ... more ... wide range of temperature. The results were similar to those for poly((R)-2-deuterio-n-hexyl isocyanate) (βPdHIC) reported in a previous publication (Gu, H., et al. Macromolecules 1995, 28, 1016). The molecular weight dependence ...
18th ITS World CongressTransCoreITS AmericaERTICO - ITS EuropeITS Asia-Pacific, 2011
Although traffic flow has so far been measured by the road detector, the probe car system is show... more Although traffic flow has so far been measured by the road detector, the probe car system is showing usefulness as a new measurement technique. When the road detector data and the probe car data that exists in a complementary relation are united, it seems that more accurate and suitable dissemination becomes possible. The present study expands spatially by uniting the road detector data with the probe car data, and is an examination of the calculation of the reliability index of more highly accurate OD travel time. The traffic state was reproduced by applying the road detector data on Tokyo Metropolitan Expressway by the traffic flow model, and the system to calculate the OD travel time based on it was constructed. Moreover, the system that easily extracted the road detector data and probe car data of the same time and same location on Tokyo Metropolitan Expressway was constructed. The data was compared and the relation was understood. However, it was clarified that the presumption system that used only the traffic flow model caused a problem with repeatable precision according to the study site.
This chapter describes the development of a method for quantifying the impacts of accessibility c... more This chapter describes the development of a method for quantifying the impacts of accessibility change on land use development and the consequent reduction of green areas in suburban areas. A method of confirmative factor analysis is adopted for identifying the causalities among accessibility change, recreational attractiveness and the change of green conservation level. A theoretical model which includes the travellers' demand for natural green and the developers' strategy related to the conservation or development of green areas is proposed and is used for assessing the impact of transport improvements. For the covering abstract see IRRD 883195.
Transportation Research Board 85th Annual MeetingTransportation Research Board, 2006
Despite the rapid improvement of the performance of alternative-fuel vehicles (AFVs), so far the ... more Despite the rapid improvement of the performance of alternative-fuel vehicles (AFVs), so far the strategic allocation of fuel stations is scarcely discussed. For the promotion of AFVs use, not only their performances and prices but also the convenience of fueling vehicles is an important factor. The activity of fueling vehicle and the trips across longer days are key inputs to fuel station allocation modeling. The objective of this paper was to develop a methodology to simulate vehicle trips over several weeks. Road traffic census data, which are useful to comprehend the state of vehicle activity across the whole area, are analyzed. However, these data are based on one-day observation and does not provide the information of the trips of a vehicle over several days or weeks. Therefore, vehicle trip survey is conducted for five weeks and its data are analyzed. We developed a simulation model based on both analyses and discussed the strategic allocation of alternative fuel stations. The result implies that if 10 zones among 53 zones in the case study area have a fuel station for each, almost all the cars encounter at least one of them for a month.
Toshi keikaku rombunshū, 2002
Proceedings of the Eastern Asia Society for Transportation Studies The 9th International Conference of Eastern Asia Society for Transportation Studies, 2011, 2011
Transport Policy Studies' Review
Journal of the City Planning Institute of Japan, 2002
Different types of road-based public transportation vehicles can be observed in many developing n... more Different types of road-based public transportation vehicles can be observed in many developing nations of Southeast Asia. For example, Thailand has its "tuktuks", Indonesia has its "bajajs" and "motos" or motorcycle taxis are familiar sight in Vietnam. In the Philippines, public utility jeepneys and tricycles are very popular. This study uses the concept of indigenous public transport modes. That is, low-occupancy, road-based motor vehicles and with unique design identifiable to its place of origin and sometimes have informal nature of operation. Thus, this paper aims to understand the different types of motor vehicles used as public transport service and in particular describe the indigenous modes by studying the public transportation system of Davao City, Philippines. A holistic planning and policy perspective is provided by understanding the history and role of different public transport modes thru its key stakeholders: government units, supply and demand using in-depth interviews and small-scale survey.
Journal of the Eastern Asia Society for Transportation Studies, 2010
The Tsukuba Express line commenced operations in August 2005, connecting Tsukuba city and Tokyo m... more The Tsukuba Express line commenced operations in August 2005, connecting Tsukuba city and Tokyo metropolitan, Japan. Based on the Tsukuba Express Railway Project, the transportation system includes road network and local bus network which had greatly restructured Tsukuba City and its surrounding area. The objective of this paper is to understand the impact of Tsukuba Express Railway Project on the actual travel pattern and behavior of the residents of the surrounding areas of Tsukuba Express. The study conducted panel data survey before and after Tsukuba Express' operation. Results indicated that residents' patterns and modal choices have changed significantly.
Uploads
Papers by Naohisa OKAMOTO