Junya Fukumoto | Tohoku University (original) (raw)
Papers by Junya Fukumoto
Lecture notes in networks and systems, Sep 14, 2023
Doboku Gakkai Ronbunshu, Oct 20, 2004
Doboku keikakugaku kenkyū, ronbunshū, 2000
Doboku Gakkai Ronbunshu, Oct 20, 2004
Doboku keikakugaku kenkyū, ronbunshū, 2005
Doboku keikakugaku kenkyū, ronbunshū, 2005
Doboku keikakugaku kenkyū, ronbunshū, 1998
Doboku keikakugaku kenkyū, ronbunshū, 2002
INFRASTRUCTURE PLANNING REVIEW, 2005
Doboku Gakkai Ronbunshu, 2004
Doboku Gakkai Ronbunshu, 2003
17th International Conference of Hong Kong Society for Transportation Studies: Transportation and Logistics Management, HKSTS 2012, Dec 1, 2012
Interdisciplinary Information Sciences, 2005
Studies in Regional Science, 2009
INFRASTRUCTURE PLANNING REVIEW, 2008
2019 International Conference on Information and Communication Technologies for Disaster Management (ICT-DM), 2019
Material convergence is a typical phenomenon observed after a large scale natural disaster happen... more Material convergence is a typical phenomenon observed after a large scale natural disaster happens. Two fundamental causes of this convergence of materials are distributed donations by heterogeneous agents inside/outside the affected area and the lack of their coordination. The author proposed a matching system of relief supplies, and it is implemented on the world wide web. The social use of the matching system is to benefit society; however, in some cases, it may not be beneficial to each user. In this study, I conduct an economic experiment and investigate the conditions under which the usage of the matching system confers comparative advantages to its users.
2018 5th International Conference on Information and Communication Technologies for Disaster Management (ICT-DM), 2018
Following a large scale disaster, a lot of people and organizations are spontaneously motivated t... more Following a large scale disaster, a lot of people and organizations are spontaneously motivated to provide relief supplies to disaster survivors. This process is fraught with challenges due to the lack of an efficient matching mechanism between the survivors’ needs and the supplies provided. In this study, we propose a matching system that streamlines the relief supplies logistics. The proposed system uses three types of information (the needs of the disaster survivors, available supplies from the supporters, and inventories at the collection facilities) and output plans for allocating, delivering, and storing supplies. Four matching methods (the demand fulfillment maximization method, time priority method, apportionment method, and multi-purpose optimization method) are defined and each of these is formulated as a mathematical programming problem. The effectiveness and characteristics of the matching system are demonstrated through case studies.
Functional region is a region that is composed of areas or locational entities which have more in... more Functional region is a region that is composed of areas or locational entities which have more interaction or connection with each other than with outside areas and be functionally complementary to each other (Brown and Holmes, 1971). Since 1970's many geographer and regional scientists have been discussing how to delineate functional regions. Interaction or connection among location entities can be represented as a graph, and some researchers proposed to apply graph theoretic techniques in delineating functional regions (e.g. Masser and Brown, 1975; Slater, 1976). In the last decade, network science made great advances boosted by the explosion of WWW and the finding of a community that is a densely connected subnetwork in the total network became one of the hottest research topics in that field. In this study, we apply a community finding method to the delineation of functional regions, and propose a new delineation method that is a combination of a modularity approach, the mos...
Spatial cluster is the set of geographical units where concentration of events is observed. Spati... more Spatial cluster is the set of geographical units where concentration of events is observed. Spatial clusters provide useful information for understanding mechanism and characteristic of socioeconomic activities. Several methods have been proposed for cluster detection. However, there is no existing method relaxes a constraint on adjacency of geographical units that compose clusters. Constraint that requires exact adjacency may have significant impact on detected clusters, especially in the case of detailed data. In this study, we propose a new cluster detection method relaxes constraints on shape and adjacency. Along the lines of model-based clustering, we assume spatial data arise through a probabilistic model. Employing Potts model on the probabilistic model, we can embed constraints on shape in the probabilistic model and relax constraints on geometric shape. The applicability of the proposed method is tested on case studies using mesh data of Japanese economic census. __________...
Studies in Regional Science
Lecture notes in networks and systems, Sep 14, 2023
Doboku Gakkai Ronbunshu, Oct 20, 2004
Doboku keikakugaku kenkyū, ronbunshū, 2000
Doboku Gakkai Ronbunshu, Oct 20, 2004
Doboku keikakugaku kenkyū, ronbunshū, 2005
Doboku keikakugaku kenkyū, ronbunshū, 2005
Doboku keikakugaku kenkyū, ronbunshū, 1998
Doboku keikakugaku kenkyū, ronbunshū, 2002
INFRASTRUCTURE PLANNING REVIEW, 2005
Doboku Gakkai Ronbunshu, 2004
Doboku Gakkai Ronbunshu, 2003
17th International Conference of Hong Kong Society for Transportation Studies: Transportation and Logistics Management, HKSTS 2012, Dec 1, 2012
Interdisciplinary Information Sciences, 2005
Studies in Regional Science, 2009
INFRASTRUCTURE PLANNING REVIEW, 2008
2019 International Conference on Information and Communication Technologies for Disaster Management (ICT-DM), 2019
Material convergence is a typical phenomenon observed after a large scale natural disaster happen... more Material convergence is a typical phenomenon observed after a large scale natural disaster happens. Two fundamental causes of this convergence of materials are distributed donations by heterogeneous agents inside/outside the affected area and the lack of their coordination. The author proposed a matching system of relief supplies, and it is implemented on the world wide web. The social use of the matching system is to benefit society; however, in some cases, it may not be beneficial to each user. In this study, I conduct an economic experiment and investigate the conditions under which the usage of the matching system confers comparative advantages to its users.
2018 5th International Conference on Information and Communication Technologies for Disaster Management (ICT-DM), 2018
Following a large scale disaster, a lot of people and organizations are spontaneously motivated t... more Following a large scale disaster, a lot of people and organizations are spontaneously motivated to provide relief supplies to disaster survivors. This process is fraught with challenges due to the lack of an efficient matching mechanism between the survivors’ needs and the supplies provided. In this study, we propose a matching system that streamlines the relief supplies logistics. The proposed system uses three types of information (the needs of the disaster survivors, available supplies from the supporters, and inventories at the collection facilities) and output plans for allocating, delivering, and storing supplies. Four matching methods (the demand fulfillment maximization method, time priority method, apportionment method, and multi-purpose optimization method) are defined and each of these is formulated as a mathematical programming problem. The effectiveness and characteristics of the matching system are demonstrated through case studies.
Functional region is a region that is composed of areas or locational entities which have more in... more Functional region is a region that is composed of areas or locational entities which have more interaction or connection with each other than with outside areas and be functionally complementary to each other (Brown and Holmes, 1971). Since 1970's many geographer and regional scientists have been discussing how to delineate functional regions. Interaction or connection among location entities can be represented as a graph, and some researchers proposed to apply graph theoretic techniques in delineating functional regions (e.g. Masser and Brown, 1975; Slater, 1976). In the last decade, network science made great advances boosted by the explosion of WWW and the finding of a community that is a densely connected subnetwork in the total network became one of the hottest research topics in that field. In this study, we apply a community finding method to the delineation of functional regions, and propose a new delineation method that is a combination of a modularity approach, the mos...
Spatial cluster is the set of geographical units where concentration of events is observed. Spati... more Spatial cluster is the set of geographical units where concentration of events is observed. Spatial clusters provide useful information for understanding mechanism and characteristic of socioeconomic activities. Several methods have been proposed for cluster detection. However, there is no existing method relaxes a constraint on adjacency of geographical units that compose clusters. Constraint that requires exact adjacency may have significant impact on detected clusters, especially in the case of detailed data. In this study, we propose a new cluster detection method relaxes constraints on shape and adjacency. Along the lines of model-based clustering, we assume spatial data arise through a probabilistic model. Employing Potts model on the probabilistic model, we can embed constraints on shape in the probabilistic model and relax constraints on geometric shape. The applicability of the proposed method is tested on case studies using mesh data of Japanese economic census. __________...
Studies in Regional Science