Jun-ichi Takayama - Academia.edu (original) (raw)
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Papers by Jun-ichi Takayama
New preventative benefits will be offered in Japan from spring 2018 in conjunction with reforms t... more New preventative benefits will be offered in Japan from spring 2018 in conjunction with reforms to the long-term care insurance system. We examined the relationship between maintenance/deterioration of the level of long-term care and services and diseases over time using KDB from late-stage elderly (hereafter "late-stage KDB") residing in City A, a medium-sized rural town. "Late-stage KDB" data from the 3-year period between 2012 and 2015 were combined, and 878 people requiring long-term care at levels II and III were included in the study. Based on the year 2012, we compared the groups requiring long-term care II and III. Furthermore, in comparison with 2015, we divided the subjects according to maintenance/deterioration of care level and compared the relevant factors between the groups. In 2015, the care level remained the same for 354 (40.3%) people, and deteriorated for 524 (59.7%) , while long-term care benefits and medical costs increased. The rate of increase in the level of care needs was higher among those in care level II. With regard to services, multifunctional long-term care in small group homes and admission increased, and facility services accounted for 47%. On the other hand, in 2012, there were no differences with regard to service use or medical costs in the group of participants requiring long-term care levels II/III who experienced care maintenance/deterioration. This was because these services were already being used in City A. Maintenance rates were high in care facilities in the surrounding areas. Pathologically, the rates of respiratory, cerebrovascular, and cognition problems increased after 3 years. Logistic regression analysis showed no relationship between type of disease and maintenance/ deterioration of care level. We believe that the reason for care deterioration is related to following the age-survival curve rather than service use.
Journal of the City Planning Institute of Japan, 2010
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2017
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2020
This study focuses on the reaction of the residents during the social experiment of bus transport... more This study focuses on the reaction of the residents during the social experiment of bus transportation service. According to AIDA model proposed in marketing, the reaction consists of several stages. The paper will assume that the reaction in each stage is different from the person who lives where the service level was low and high before the experiment. Specifically, the person who lives where the service level was low does not react well because the service level has been too low to have concern for the bus service. The paper will verify this assumption using the data from the social experiment conducted in Hiraka Town. As a result, this assumption is verified. Thus the disparity of the responsiveness in the service level before the experiment exists. This paper discussed that it is not fair to use the observed responsiveness for the information basis of the bus transportation service after the experiment because of the disparity.
The logit model based on random utility theory has often been used for discrete choice behavior a... more The logit model based on random utility theory has often been used for discrete choice behavior analysis. In the conventional logit model, it is assumed that variables are independent of each other and that their relationship is linear. In general, the relationship or behavior of the variables is non-linear, and the assumptions of the logit model are not always proper. Therefore, incorporating neural networks, which are suitable to make an analysis non-linearly, to the logit model is very useful. In this study, we propose the logit model using non-linear utility functions with neural network. Then, we analyze a discrete choice behavior in traffic phenomenon by the model, and examine the validity of the model.
─ Travel time of public transport such as railway and Light Rail Transit (LRT) is more reliable t... more ─ Travel time of public transport such as railway and Light Rail Transit (LRT) is more reliable than road traffic. When assessing the effect of railway transits, the reliability should be considered. Otherwise, the effect may be underestimated. Then, we should not only treat both transit and road users simultaneously and consistently, but also travel time uncertainty of cars and the reliability (or punctuality) of railway for exact evaluation. A network equilibrium model with combined mode and route choice considering road travel time uncertainty does not necessarily have a unique solution, but may have many local solutions, because of the interaction between modes. The simulated annealing is one of the useful techniques to such a problem, to the calculation of the network equilibrium model with combined mode and route choice. In this paper, we apply the network equilibrium model proposed to the Kanazawa urban area using the simulated annealing technique.
This paper proposed three types of models to estimate origin destination (OD) matrix from traffic... more This paper proposed three types of models to estimate origin destination (OD) matrix from traffic counts on links and it assumes that a set of destination choice probabilities from origin nodes is fixed as constants. Model A is formulated by minimization of the sum of square errors between the estimated and the observed link flow only, Model B by minimization of the sum of square errors between the estimated and the outdated generation trips from nodded under the constraints of link flow consistency, and Model C by minimization of the total sum of the square errors in the generation trips and the link flows. Considering that the existence of errors in the predetermined and the observed data will give some influences on the accuracy of the estimates in practical applications of the model. The authors examined and compared the properties of the respective models through numerical analyses.
INFRASTRUCTURE PLANNING REVIEW, 2010
INFRASTRUCTURE PLANNING REVIEW, 2009
INFRASTRUCTURE PLANNING REVIEW, 2010
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2019
Transportation Research Record: Journal of the Transportation Research Board, 2005
This study introduces an ecotravel coordinator program to reduce car use. In this system, ecotrav... more This study introduces an ecotravel coordinator program to reduce car use. In this system, ecotravel coordinators are put in charge of several people. They organize ecotravel meetings and are responsible for taking the initiative. During the meetings participants recognize and deepen their understanding of their travel behaviors and devise their own plans for reducing car use. The aim of this study is to examine the validity of the ecotravel coordinator program through an experimental method. One result of the experiments was that the ecocoordinators and the other participants reduced their car travel mileage 54% and 48%, respectively. Nonparticipants, however, almost never reduced their travel mileage (1.4% reduction). Thus, experiment results indicate that the system is fairly effective for reducing car use.
Journal of Japan Society of Civil Engineers, Ser. F5 (Professional Practices in Civil Engineering), 2014
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2016
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2017
Doboku Gakkai Ronbunshu, 2003
Journal of Japan Society of Civil Engineers, Ser. F6 (Safety Problem), 2012
INFRASTRUCTURE PLANNING REVIEW, 1995
INFRASTRUCTURE PLANNING REVIEW, 2003
New preventative benefits will be offered in Japan from spring 2018 in conjunction with reforms t... more New preventative benefits will be offered in Japan from spring 2018 in conjunction with reforms to the long-term care insurance system. We examined the relationship between maintenance/deterioration of the level of long-term care and services and diseases over time using KDB from late-stage elderly (hereafter "late-stage KDB") residing in City A, a medium-sized rural town. "Late-stage KDB" data from the 3-year period between 2012 and 2015 were combined, and 878 people requiring long-term care at levels II and III were included in the study. Based on the year 2012, we compared the groups requiring long-term care II and III. Furthermore, in comparison with 2015, we divided the subjects according to maintenance/deterioration of care level and compared the relevant factors between the groups. In 2015, the care level remained the same for 354 (40.3%) people, and deteriorated for 524 (59.7%) , while long-term care benefits and medical costs increased. The rate of increase in the level of care needs was higher among those in care level II. With regard to services, multifunctional long-term care in small group homes and admission increased, and facility services accounted for 47%. On the other hand, in 2012, there were no differences with regard to service use or medical costs in the group of participants requiring long-term care levels II/III who experienced care maintenance/deterioration. This was because these services were already being used in City A. Maintenance rates were high in care facilities in the surrounding areas. Pathologically, the rates of respiratory, cerebrovascular, and cognition problems increased after 3 years. Logistic regression analysis showed no relationship between type of disease and maintenance/ deterioration of care level. We believe that the reason for care deterioration is related to following the age-survival curve rather than service use.
Journal of the City Planning Institute of Japan, 2010
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2017
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2020
This study focuses on the reaction of the residents during the social experiment of bus transport... more This study focuses on the reaction of the residents during the social experiment of bus transportation service. According to AIDA model proposed in marketing, the reaction consists of several stages. The paper will assume that the reaction in each stage is different from the person who lives where the service level was low and high before the experiment. Specifically, the person who lives where the service level was low does not react well because the service level has been too low to have concern for the bus service. The paper will verify this assumption using the data from the social experiment conducted in Hiraka Town. As a result, this assumption is verified. Thus the disparity of the responsiveness in the service level before the experiment exists. This paper discussed that it is not fair to use the observed responsiveness for the information basis of the bus transportation service after the experiment because of the disparity.
The logit model based on random utility theory has often been used for discrete choice behavior a... more The logit model based on random utility theory has often been used for discrete choice behavior analysis. In the conventional logit model, it is assumed that variables are independent of each other and that their relationship is linear. In general, the relationship or behavior of the variables is non-linear, and the assumptions of the logit model are not always proper. Therefore, incorporating neural networks, which are suitable to make an analysis non-linearly, to the logit model is very useful. In this study, we propose the logit model using non-linear utility functions with neural network. Then, we analyze a discrete choice behavior in traffic phenomenon by the model, and examine the validity of the model.
─ Travel time of public transport such as railway and Light Rail Transit (LRT) is more reliable t... more ─ Travel time of public transport such as railway and Light Rail Transit (LRT) is more reliable than road traffic. When assessing the effect of railway transits, the reliability should be considered. Otherwise, the effect may be underestimated. Then, we should not only treat both transit and road users simultaneously and consistently, but also travel time uncertainty of cars and the reliability (or punctuality) of railway for exact evaluation. A network equilibrium model with combined mode and route choice considering road travel time uncertainty does not necessarily have a unique solution, but may have many local solutions, because of the interaction between modes. The simulated annealing is one of the useful techniques to such a problem, to the calculation of the network equilibrium model with combined mode and route choice. In this paper, we apply the network equilibrium model proposed to the Kanazawa urban area using the simulated annealing technique.
This paper proposed three types of models to estimate origin destination (OD) matrix from traffic... more This paper proposed three types of models to estimate origin destination (OD) matrix from traffic counts on links and it assumes that a set of destination choice probabilities from origin nodes is fixed as constants. Model A is formulated by minimization of the sum of square errors between the estimated and the observed link flow only, Model B by minimization of the sum of square errors between the estimated and the outdated generation trips from nodded under the constraints of link flow consistency, and Model C by minimization of the total sum of the square errors in the generation trips and the link flows. Considering that the existence of errors in the predetermined and the observed data will give some influences on the accuracy of the estimates in practical applications of the model. The authors examined and compared the properties of the respective models through numerical analyses.
INFRASTRUCTURE PLANNING REVIEW, 2010
INFRASTRUCTURE PLANNING REVIEW, 2009
INFRASTRUCTURE PLANNING REVIEW, 2010
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2019
Transportation Research Record: Journal of the Transportation Research Board, 2005
This study introduces an ecotravel coordinator program to reduce car use. In this system, ecotrav... more This study introduces an ecotravel coordinator program to reduce car use. In this system, ecotravel coordinators are put in charge of several people. They organize ecotravel meetings and are responsible for taking the initiative. During the meetings participants recognize and deepen their understanding of their travel behaviors and devise their own plans for reducing car use. The aim of this study is to examine the validity of the ecotravel coordinator program through an experimental method. One result of the experiments was that the ecocoordinators and the other participants reduced their car travel mileage 54% and 48%, respectively. Nonparticipants, however, almost never reduced their travel mileage (1.4% reduction). Thus, experiment results indicate that the system is fairly effective for reducing car use.
Journal of Japan Society of Civil Engineers, Ser. F5 (Professional Practices in Civil Engineering), 2014
Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management), 2016
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2017
Doboku Gakkai Ronbunshu, 2003
Journal of Japan Society of Civil Engineers, Ser. F6 (Safety Problem), 2012
INFRASTRUCTURE PLANNING REVIEW, 1995
INFRASTRUCTURE PLANNING REVIEW, 2003