Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The City Planning Institute of Japan  

DOI： 10.14398/urpr.9.153

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1080/13658816.2022.2100891

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Emerald  

Purpose

This study aims to explore the spatial externalities of apartment vacancy rates on housing rent by considering multiple vacancy durations.

Design/methodology/approach

This research uses smart meter data to measure unobservable vacant houses. This study made a significant contribution by applying building-level smart meter data to housing market analysis. It examined whether vacancy duration significantly affected apartment rent and whether the relationship between apartment rent and vacancy rate differed depending on the level of housing rent.

Findings

The primary finding indicates that there is a significant negative correlation between apartment rent and vacancy duration. Considering the spatial externalities of apartment vacancy rates, the apartment vacancy rates of surrounding buildings did not show any statistical significance. Moreover, quantile regression results indicate that although the bottom 10% of apartment rent levels showed a negative correlation with all vacancy durations, the top 10% showed no statistical significance related to vacancies.

Practical implications

This study measures the extent of spatial externalities that can differentiate taxation based on housing vacancies.

Originality/value

The findings indicate that landlords have asymmetric information about their buildings compared with the surrounding buildings, and the extent to which price adjusts for long-term vacancies differs depending on the level of apartment rent.

DOI： 10.1108/ijhma-03-2022-0035

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Other Link： https://www.emerald.com/insight/content/doi/10.1108/IJHMA-03-2022-0035/full/html

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.cities.2022.103614

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

This study examines regional differences in local environment factors to better understand the sustainability of local governments indexed by per capita public spending. Under the condition of heterogeneous population size, we examine how factor characteristics differ depending on the spatial context represented by the urban area category. By employing a Cobb–Douglas cost function with congestion effects on public service provision, the estimated factors enable us to articulate major factors and differences in cost-efficiency between urban area categories. We found that statistical significance and even the signatures of local environment factors differ depending on the urban employment area category. Regarding factors such as the ratios of employees in secondary and tertiary industries, these did not tend to be statistically significant in small-sized urban areas, while small-sized cities in large-sized urban areas were likely to gain confidence intervals. Moreover, we did not observe any statistical significance for the ratio of elderly people due to the balance of spending between national and local governments. These findings could contribute to sustainable management of cities in the advent of population decline.

DOI： 10.1177/23998083211003883

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Other Link： http://journals.sagepub.com/doi/full-xml/10.1177/23998083211003883

Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/IGARSS46834.2022.9883609

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Other Link： https://dblp.uni-trier.de/db/conf/igarss/igarss2022.html#TomitaABY22

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1111/tgis.12992

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/tgis.12992

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

DOI： 10.3130/aija.86.2136

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1080/13467581.2021.1964976

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejipm.77.2_62

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society for Artificial Intelligence  

Real estate information database, an influential data source for comprehensive understanding of real estate transactions, has some problems, since the database is created by multiple real estate intermediary agents. Particularly, we confirm that there are substantial duplication in condominiums and apartments, and thus, it is necessary to integrate the duplicate records together. We regard the task as one of record linkage problems, and develop the model integrating the high likelihood of dwellings with the application to existing data handling techniques such as hierarchical clustering. We then validate whether the integrated records by the proposed method achieve practical recall and precision.

DOI： 10.11517/pjsai.jsai2021.0_4f3gs10n03

CiNii Books

CiNii Research

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00082/

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Copernicus GmbH  

Abstract. Vacant housing detection is an urgent problem that needs to be addressed. It is also a suitable example to promote utilisation of smart data that are stored in municipalities. This study proposes a vacant housing detection model that uses closed municipal data and considers accelerating the use of public data to promote smart cities. Employing a machine learning technique, this study ensures high predictive power for vacant housing detection. The model enables us to handle complex municipal data that include non-linear feature characteristics and substantial missing data. In particular, handling missing data is important in the practical use of closed municipal data because not all of the data are necessarily absorbed to a building unit. Consequently, the model in this analysis showed that the accuracy and false positive rate are 95.4 percent and 3.7 percent, respectively, which are high enough to detect vacant houses. However, the true positive rate is 77.0 percent. Although the rate is not low to some extent, selection of features and further collection of extra samples may improve the rate. Geographic distribution of vacant houses further enabled us to check the difference between the actual and estimated number of vacant houses, and more than 80 percent of 500-meter grid data are with below 10 errors, which we think, provides city planners with informative data to roughly grasp geographical tendencies.

DOI： 10.5194/isprs-annals-vi-4-w2-2020-1-2020

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Informa {UK} Limited  

DOI： 10.1080/03003930.2019.1624257

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

DOI： 10.1007/s41685-019-00119-6

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11361/journalcpij.54.1541

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Language：Japanese   Publisher：The City Planning Institute of Japan  

Massive building demolitions were accomplished in eastern Germany from 2002. This study investigates the relationship between current land use after the massive building demolition and demolition plan and future land use policy focusing on large housing estates in Marzahn-Hellersdorf, Berlin. Based on literature review, field survey, and a series of quantitative analyses, following results are shown. First, building demolition sites generate various types of both public and private reutilized spaces. Second, building sites were subject to marketing during an early stage, or were transformed according to housing needs and location characteristics. Third, once building demolition sites have been designated as activated open spaces, the sites are likely to be preserved as open spaces.

DOI： 10.11361/journalcpij.54.163

CiNii Research

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18J11698/

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

The issue of vacant houses is receiving increased attention in the field of urban policy and planning in Japan. We aim to describe the factors of vacant houses that lead to abandonment from the perspectives of the characteristics of the built environment and property owners using a logistic regression model to analyze the relationship between housing abandonment and these characteristics. There were five major findings. First, building age and attachment to a road less than four meters wide increase the probability of housing abandonment, although urbanization before 1960 lowers the probability. Second, an exclusively residential zone is more likely to be associated with floor area, which makes abandonment more likely and building age in this zone has a positive relationship particularly to an overgrowth of trees. Third, the further away the property owner's own residence is from the vacant house, the greater the likelihood that it will be abandoned. Fourth, vacancies owing to the demise of the previous occupants significantly raise the likelihood of housing abandonment. Fifth, the probability of housing abandonment is extremely high when the owner of the vacant house is unknown.

DOI： 10.1002/2475-8876.12088

Web of Science

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Authorship：Lead author   Language：Japanese  

J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publisher：日本建築学会  

 Far suburban residential areas, located around 50 km from Central Tokyo, are facing problems such as a decreasing and aging population and an increase in the number of vacant houses. One solution to these problems is promotion of “<i>kinkyo</i>” (living near relatives). When a young household lives near their parents, they can receive childcare support from their parents and the parents, in turn, may be cared for by their children in the future. However, the current situation of <i>kinkyo</i> cannot be determined from existing statistics and its benefits have not been proven with evidence. We aimed to grasp the current situation of <i>kinkyo</i> and prove its benefits in Koma-Musashidai District in Hidaka City, Saitama, Japan. Approximately 5000 people from 2000 households live in the district.<br> First, we conducted a questionnaire survey of residents with the cooperation of the residents' organization in November 2015, to which 611 householders or their spouses responded. Next, an interview survey with the only real estate agent in the district, which deals with approximately 80% of real estate transactions in the district, was conducted in January 2017 to ask about transactions between 2010 and 2016. Then, we conducted a word-of-mouth survey of residents to get information on positional relationships between parent-child <i>kinkyo</i> pairs on a housing map in September 2017.<br> The results of the questionnaire survey showed the proportion of residents who lived near their parents or children was more than 10% and around one-third of young (<45 years old) households responded that their parents lived in the same district. Significantly high percentage of households who lived near their parents inhabited townhouses, which occupy around 20% of housing in the district and are smaller and less expensive than detached houses. The proportion of <i>kinkyo</i> in real estate transactions was around 20% and pregnancy or the birth of grandchildren was often a trigger of a child's household move into the district. Regarding positional relationships between parent-child pairs, they tended to live in the same neighborhood among seven neighborhoods in the district and parent-child pairs lived significantly nearer on average than randomly selected pairs from all houses in the district. Regarding the benefits of aged parents living near their child's household, the child or his/her spouse routinely went shopping on behalf of the parents; therefore, they tended to have significantly less inconvenience than other aged residents. Additionally, aged parents tended to have less anxiety regarding continuing to live in the district and their home as their final abode, as well as better self-rated health.<br> The findings of this study on the current situation of <i>kinkyo</i> and its benefits provide evidence for the promotion of <i>kinkyo</i>. Residents' associations could serve as the voices of aged residents who live near their children and enjoy the benefits of <i>kinkyo</i> to other residents in the district and their children living outside of the area. Real estate agents should deliver information about newly vacant properties within a neighborhood to its residents first because parent-child pairs tend to live close to each other. The municipality should moderate the required conditions of subsidies for the promotion of <i>kinkyo</i> because households moving into the district previously did not meet its strict conditions.

DOI： 10.3130/aija.83.1497

J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：日本建築学会  

The issue of vacancies has been receiving increasing attention. We aim to describe factors and tendencies of housing abandonment from the perspective of the built environment and property owner characteristics. Using logistic regression, we analyzed the relationship between housing abandonment and the characteristics, and three major findings were clarified. First, building age and attachment to a road less than 4 m wide raised the probability of housing abandonment. Second, floor area was positively related to housing abandonment in exclusive residential zoning areas only. Third, a relationship was seen between several property owner characteristics and housing abandonment.

DOI： 10.3130/aija.83.1263

J-GLOBAL

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Authorship：Lead author   Language：Japanese  

J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：公益社団法人 日本都市計画学会  

The aim of this research is to analyze the natural and cultural resources of open spaces based on watershed unit. The study area is Sennan region, Miyagi prefecture. The methodology of this study is to examine the natural and cultural resources such as naturalness of vegetation, the rate of agriculture, and the distribution of temples and shrines quantitatively utilizing GIS. As a result of analysis, three outcomes were clarified. First, the study area was able to be divided into three or four segments. Second, by analyzing vegetation naturalness, biomass energy, and agricultural rate, comprehensive understanding of natural resources was illustrated. Third, the rate of flooding and the distribution of disaster enabled us to appreciate that most cultural resources were suffered by tsunami on law lying drainage basin. All in all, as a framework of open space analysis, effectiveness of the idea of watershed unit was clarified.

DOI： 10.11361/journalcpij.48.555

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：公益社団法人 日本都市計画学会  

On March 11th, 2011, tsunami devastated the Pacific coast of north-eastern Japan. The paper aims to clarify the detail damage situation and the disaster prevention function of Igune. The target area is rural settlements in the coastal area of Iwanuma City. The following two points were mainly clarified. Firstly, Igune is mainly formed by Japanese cedar, which is not tolerant of salty environment. Igune in flooded areas died and has subsequently been cut down. Secondly, Igune reduced tsunami damage. Some reduced the impact of the tsunami damage and prevent the inflow of driftwood and debris with their east part. And others prevent the outflow of houses and household belongings with their north or west part.

DOI： 10.11361/journalcpij.48.100

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：日本建築学会  

The aim of this research is to clarify how vacant spaces in Tomo district are distributed and how they have been utilized through accumulated changes. Those vacant spaces can be classified into nine types in terms of location, process, and users. Some vacant spaces are richly utilized by the surrounding neighbors without any relations of their owners. Such a common use is only found at the historical urban area, not at the landfill zone, and is likely to happen where residents have known each other before it becomes vacant.

DOI： 10.3130/aija.78.615

CiNii Books

J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：公益社団法人 日本都市計画学会  

The aim of this research is to clarify the correlative relationship between natural condition and the tsunami and earthquake disaster, and how the target area develops in relation with the natural condition by creating a map which illustrates the units of natural sites. As a result of analysis, three outcomes were clarified. First, correlation with the units of natural sites was observed with respect to land use change. Also, settlements onto specific units of natural sites, which are not suitable for settlements, had incurred more severe damage during the disaster. Second, natural site units were classified depending on the situation of the tsunami and earthquake disaster. Third, natural site units provide a better way to reconstruct settlements against earthquake-tsunami disaster as an urban planning technique and a sustainable way for regional structure.

CiNii Books

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J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本建築学会  

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Authorship：Lead author   Language：Japanese   Publishing type：Meeting report  

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Language：Japanese   Publishing type：Meeting report  

CiNii Books

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Event date： 2023.8 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Viet Nam  

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Event date： 2023.7 　 　

Language：English   Presentation type：Oral presentation (general)   Country：United States  

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Event date： 2022.12 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2022.11 　 　

Language：Japanese   Presentation type：Oral presentation (invited, special)   Country：Japan  

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Event date： 2022.10 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2022.10 　 　

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)   Country：Japan  

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Event date： 2022.7 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Malaysia  

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Event date： 2022.6 　 　

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2022.6 　 　

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)   Country：Japan  

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Event date： 2022.6 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.11 　 　

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech   Country：Japan  

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Event date： 2021.11 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.11 　 　

Language：Japanese   Presentation type：Symposium, workshop panel (public)   Country：Japan  

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Event date： 2021.10 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.6 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.5 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2021.2 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2020.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2020.10 　 　

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2020.9 - 2020.10

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2019.12 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2019.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2019.11 　 　

Language：Japanese   Country：Japan  

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Event date： 2019.10 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2019.9 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Luxembourg  

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Event date： 2018.11 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Spain  

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Event date： 2018.10 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2018.10 　 　

Country：Japan  

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Event date： 2018.9 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2017.11 　 　

Language：Japanese   Presentation type：Poster presentation   Country：Japan  

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Event date： 2017.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2017.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2017.8 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2013.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2012.11 　 　

Language：Japanese   Presentation type：Oral presentation (general)   Country：Japan  

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Event date： 2012.11 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Viet Nam  

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Event date： 2012.9 　 　

Language：English   Presentation type：Oral presentation (general)   Country：Russian Federation  

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