AIJ Journal of Technology and Design
Online ISSN : 1881-8188
Print ISSN : 1341-9463
ISSN-L : 1341-9463
Current issue
Displaying 51-98 of 98 articles from this issue
Environmental Engineering
  • Yui HORISHITA, Hiroto SUNOUCHI, Kei SAITO, Yuichi SUESHIGE, Kazuma SEK ...
    2025Volume 31Issue 79 Pages 1437-1442
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In this study, the purpose is to investigate the conditions necessary to improve the user experience of a robot guiding pedestrians to their destinations with providing information. Three key findings were successfully obtained by analyzing from both a practical and emotional perspectives the video data of the experiment and the results of a questionnaire survey conducted after the experiment. The first is the effectiveness of multi-robot guidance of multiple people, the second is the characteristics of the two types of guidance pattern, and the third is the comfortable distance between the robot and pedestrian.

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Architectural Planning and Design
  • -A case study of Soma city, Fukushima prefecture-
    Mizuki HAYAKAWA, Minsuk KIM, Gregorius Agung SETYONUGROHO, Norio MAKI
    2025Volume 31Issue 79 Pages 1443-1448
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study examines the “ownership transfer” as a measure contributing to residents’ housing stability and community sustainability. While progress in implementing this policy remains limited across the three disaster-affected prefectures, case studies in Soma City suggest its potential to enhance regional resilience through disaster public housing transfers. Effective utilization requires streamlining administrative approval and improving demand assessment. The policy supports disaster victims’ housing security and diverse household integration. However, residents’ adaptive use, including expansion, reflects dissatisfaction with standardized housing. Providing stable living environments necessitates flexible housing plans tailored to household characteristics.

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  • Yan LI
    2025Volume 31Issue 79 Pages 1449-1454
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study examines the reorganization of public libraries with overall reduction in the London Borough of Brent, analyzing the process and outcomes of both council and community managed libraries (CL). The findings show that council managed libraries are located in easily accessible areas with diverse services and multi-functional spaces, whereas CLs are in less convenient locations with smaller buildings. CLs provide not only reading spaces but also multi-purpose rooms and kitchens for community activities. While Brent’s reorganization met budget cut targets, many residents opposed the closures, valuing libraries more as community spaces than solely as places for books.

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  • Hajime SHIMIZU
    2025Volume 31Issue 79 Pages 1455-1460
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This paper shows the findings through installation of “play furniture”, furniture or instruments for play and living place, in an after school childcare facility. “Ichijo-Loft”, which is a furniture like a small loft, was installed in an facility in Okinawa prefecture and observation survey of children’s behavior was conducted before and after the installation. “Ichijo-Loft” was mainly used by children who often did act of hub use and spontaneous act or children who’s position in children’s group were fluid. The findings shows the possibility to use “play furniture” by facility staffs as tools for making children’s living place.

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  • Yuji TAKAHASHI, Ryo SUGAHARA, Kana EGAWA
    2025Volume 31Issue 79 Pages 1461-1466
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In this study, we identified the trends in the number of visitors to disaster lore facilities nationwide, clarified the innovations and issues in facility operation, and organized the operational measures of disaster lore facilities according to the characteristics of the facilities. As a result, it was found that it is important to continue to operate facilities and attract visitors based on the characteristics of each facility, to refer to the innovations of existing facilities, and to pass on the reality and lessons learned from each unique disaster based on the characteristics of each disaster.

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  • Case study of Fukui city
    Ompor CHIN, Minjung BAE, Masato NISHIMOTO, Shuhei ASANO, Yukio AKASHI
    2025Volume 31Issue 79 Pages 1467-1472
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study aims to assess the accessibility of the first designated evacuation shelters to be opened at the time of a disaster in Fukui City for individuals requiring special assistance who need to use these shelters independently. Specifically, we intend to analyze the following: 1) The status of the barrier-free environment in the buildings of the first designated evacuation shelters to be opened during a disaster, particularly where acceptance spaces are placed. 2) The need for the use of evacuation shelters by individuals requiring special assistance, focusing on the community center’s acceptance spaces.

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  • Masayoshi KOGA, Kai UMEZU, Maki MURAKAWA, Asuka YAMADA, Yoshimune HIRA ...
    2025Volume 31Issue 79 Pages 1473-1478
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This paper clarifies specific initiatives and innovations related to environmental adjustments at schools for special needs education (visual impairment). The study focuses on students’ learning and daily activities in school buildings, teachers’ educational and daily-life support there, and living activities in residential facilities. The following were identified as the main responses: assistance with mobility for safety, understanding the positions of oneself, rooms, and objects for convenience, and adjusting daylight and lighting for comfort.

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  • Takumi IWASE, Asuka YAMADA
    2025Volume 31Issue 79 Pages 1479-1484
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study focused on the renovation of empty warehouses/factories that occurred in areas where industry and distribution structures have changed. When a business operator aims to revitalize a region in a warehouse/factory renovation, the renovated warehouse/factory becomes a hub for attracting visitors and businesses to the hollowed-out area and forming a new community. Warehouses and factories have a high degree of freedom in spatial configuration, and can be renovated to create attractive spaces. However, they are not designed for human activities, and it has been found that there are issues with heat insulation etc. when using them as living spaces.

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  • –Focusing on the shop of the small businesses utilizing the vacant houses–
    Moe DONAKA, Emiko ITAMI, Tomone MIYAMURA, Takashi YOKOTA, Takashi AOKI
    2025Volume 31Issue 79 Pages 1485-1490
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    We clarified in detail the process from the occurring of the practical use concept to the operation method focusing of one case. As a result, the evaluation of the utilization possibility of the building stocks, which is an important phase of the process, could be divided into three perspectives: management, profitability, and space design. We could say that considering the utilization possibility and the content of the renovation specifically can contribute to sharing the image of using the stocks among the user of space and the owner and create prosperity and continuing of the place.

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  • Yoko FUJII, Shuto SHIKADA, Masamichi TANAKA, Tatsuya NISHINO
    2025Volume 31Issue 79 Pages 1491-1496
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The aim of this paper is to clarify the characteristics and problems of the non-designated emergency shelters set up after the Noto Peninsula earthquake in 2024. We conducted literature reviews, interviews and surveys of shelters in Suzu City, Ishikawa Prefecture. The results showed that 1) non-designated shelters tended to be difficult to reach for support, but they were self-managed and support from private support groups was also effective, and 2) non-designated shelters tended to have fewer rooms and facilities than designated shelters, and in some cases designated shelters supplemented the housing environment.

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  • Hiroki ONO, Yuji MATSUDA
    2025Volume 31Issue 79 Pages 1497-1502
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The purpose of this study is to clarify the current status of the evacuation environment and support system for people requiring assistance, focusing on direct evacuating to welfare shelters. Questionnaires were sent to municipalities throughout Japan regarding the environment and systems, and interviews were conducted with several municipalities regarding their actual conditions. As a result, it was found the problems faced and the support provided differ depending on disaster type, the situation of people requiring assistance and geographical conditions. Additionally, it was suggested the capacity of shelters for people with mental and intellectual disabilities in particular tends to be inadequate.

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  • - Case study of an elliptical lawn space -
    Kanta YAMAMOTO, Asuka YAMADA
    2025Volume 31Issue 79 Pages 1503-1508
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In recent urban development projects, parks and large-scale commercial facilities have adopted lawn spaces as places where people can stay freely. In this study, we aimed to investigate the behavior of visitors in Lawn Plaza A attached to a commercial facility and clarify the relationship with the actual usage and the surrounding environment. As a result, we clarified that the slope of the lawn surface, the flow of people passing by, and the presence or absence of plants and objects are related to the behavior of visitors, and that the behavior of visitors differs depending on attributes.

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  • ― Design process to inherit the cultural background of Migishi Atelier designed by Iwao Yamawaki ―
    Ken AKATSUKA, Gaku INOUE, Naoki SAITO, Satoshi SANO
    2025Volume 31Issue 79 Pages 1509-1514
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The focus is on a design process for inheriting the cultural values of modern housing architecture. While the utilization of existing stock is an urgent issue in contemporary society, there has not been sufficient discussion of attempts to preserve and renovate buildings, especially those that are recognized as having historical and cultural values. This paper describes the repair and renovation of Migishi Atelier (original design: Iwao Yamawaki) and clarifies the specific issues and the design process in the preservation and utilization of modern housing architecture.

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  • Hiroto TANAKA, Norihisa KAWASHIMA
    2025Volume 31Issue 79 Pages 1515-1520
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This paper studies the feasibility of introducing “eco-friendly self-made insulation materials” on Ogijima, using natural or waste materials available locally. A survey of private homes revealed limited thermal comfort. Four materials, waste bedding, eelgrass, rice husks, and kanna shavings were selected for the insulation. These were found to provide comparable or superior insulation performance to glass wool, with significantly lower CO2 emissions during production, transport, and disposal. These materials were also found to be less expensive. The study concludes that these self-made insulation materials could be a viable alternative for the island’s residents.

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  • A Qualitative study
    Kensuke TSUTSUI, Shiori TAKAHASHI, Yonggeun LEE, Toshio OTSUKI
    2025Volume 31Issue 79 Pages 1521-1526
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    As the number of elderly patients receiving home medical care increases, and more people wish to spend their final days at home, there is growing need to improve living environments for end-of-life care. However, under current insurance systems, collaboration between medical professionals and home modification specialists remains limited. Physicians and visiting nurses emphasize the importance of understanding patients’ lives through their home environments, but systematic methods for such assessment are lacking. This study explores an approach where visiting physicians video-record patients’ living spaces to identify and analyze observation points supporting more effective home modification assessment.

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Rural Planning
  • Celine JAMIN, Hirohide KOBAYASHI, Mizuki SUGINAKA
    2025Volume 31Issue 79 Pages 1527-1532
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    Japanese thatch architecture embodies centuries of wisdom, yet rapid changes in climate, materials, labor, and economics challenge its sustainability. While modifications are often seen as threats to authenticity, this study explores how well-integrated technical adaptations can enhance longevity. Framed through craftsmen perspectives, it draws on interviews, observations, and surveys with thatchers of Miyama Kayabuki company in Kita Village, Japan. The study categorizes technical modifications as “Optimized & Retained” or “Detrimental & Reverted.” Findings show that adaptations by skilled craftspeople still preserve cultural integrity while ensuring relevance. Embracing informed modifications balances tradition with contemporary needs, safeguarding thatch heritage for future generations.

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Urban Planning
  • - Focus on spatial development, including abandoned and vacant land and vacant house utilization -
    Masato YOSHIDA, Kaho KUBOTA, Kosuke MASUO
    2025Volume 31Issue 79 Pages 1533-1538
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In this study, we first identify local construction companies engaged in new business fields in the Tokai region. Next, we will identify the business content and development area of the new field projects. Then, we will clarify the business development of a company that is engaged in spatial development as a new business field, including the improvement of land use such as abandoned and vacant land, and the utilization of vacant houses. Therefore, the purpose of this study is to clarify the business development of local construction companies in new field business that contribute to regional spatial management.

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  • Liang HUANG, Yoshihisa WAKITA, Yasushi TAKEUCHI, Hideo SHIRAISHI
    2025Volume 31Issue 79 Pages 1539-1544
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study takes the spatial structure changes of Dafen Village in Shenzhen, China as an example to clarify the spatial configuration characteristics of the village in the city. At the same time, by examining the spontaneous daily life activity landscape generated by the behavior of residents and tourists in this space and the state of community daily necessities, understand the living atmosphere of the village in the city in this area, and clarify the relationship between the spatial layout of Dafen Village and the living conditions.

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  • - Focusing on different means of transportation -
    Shinji HIRAI, Shota TAMURA, Takahiro TANAKA
    2025Volume 31Issue 79 Pages 1545-1549
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In recent years, the concept of the Parisian urban policy known as the “15-minute city” has attracted much attention. This policy emphasizes urban development centered on residence, and we considered it important to understand the extent to which residents currently live within their travel range. Therefore, based on a questionnaire survey, we investigated the actual travel conditions to 13 different facilities and the level of satisfaction with travel time. As a result, it became clear that the level of satisfaction with travel time differs depending on the means of transportation used, even if the travel time is the same.

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  • Shohei UDAGAWA, Akio YASUMORI, Yoshiaki IKEUCHI, Toshihiko ABE
    2025Volume 31Issue 79 Pages 1550-1555
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The aim of this paper is to clarify the improvement model of a innovation commons that collaborates with the local community on a newly established university campus. First, we organized the basic information and history of the three target universities. Secondly, we analyzed the changes in space. Thirdly, we analyzed the organization and activities. Fourthly, we analyzed the characteristics of the three universities from both aspects. Finally, we derived improvement models for both aspects based on the commonalities of the three universities.

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  • ~Through surveys for the residents of Tsumori in Nishinari district and visitors to Nishinari Jagapea Park~
    Yoshifumi OKAGE
    2025Volume 31Issue 79 Pages 1556-1561
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The purpose of this study is to investigate the effects of a playpark which utilizes a site of a closed school. Questionnaire survey was conducted on residents of Tsumori, Nishinari Ward, and users of the Nishinari Jagapea Park which is a playpark established in a site of a closed elementary school. The results showed that the playpark has an impact on the image of the environment surrounding local children and their interest in the environment surrounding children.

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  • Mio SUZUKI
    2025Volume 31Issue 79 Pages 1562-1567
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study surveyed municipalities to examine outdoor temporary markets as an administrative policy. It assessed market size (frequency, vendors, visitors, and budget) and implementation outcomes, such as incidents, effectiveness measures, and challenges. The results show that these markets are relatively cost-effective. However, over 30% of responses lacked effectiveness measurements, indicating unclear impacts. Without proper assessment, these markets risk becoming a short-term trend. Establishing robust evaluation methods is crucial to ensure their sustainability and long-term effectiveness.

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  • - Toward levee improvements to reduce flood damage throughout the basin in 2050 -
    Taisei MORIYAMA, Shota TAMURA, Takahiro TANAKA
    2025Volume 31Issue 79 Pages 1568-1572
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    In recent years, it has become necessary to understand the impact of levee improvement on flood damage in different watersheds in order to achieve basin-wide flood control, which requires levee improvement based on the flood risk balance of the entire basin. In this study, scenarios with different levee improvement areas were developed for the Kurose River watershed, and the effects of different levee maintenance areas on flood damage were determined using DioVISTA/Flood. The results showed that levee improvement in the upper reaches of the river leads to the most reduction of the population exposed to flooding in the entire basin.

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  • Misaki ABE, Yukari NIWA, Tomonori SANO
    2025Volume 31Issue 79 Pages 1573-1578
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This research extends previous work by Furuya et al., examining the impact of changing room detours on tsunami evacuation times at swimming pool facilities. Two hypotheses were investigated through questionnaire surveys and evacuation simulations: (1) the prevalence of changing room visits during evacuation and (2) the relationship between occupancy duration and evacuation efficiency. Analysis revealed that approximately 20% of visitors intended to access changing rooms, substantially prolonging overall evacuation time by up to six minutes. Furthermore, occupancy durations exceeding 90 seconds critically impaired evacuation completion times.

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  • - Comparison of multi-point simultaneous air temperature measurements in 2013 and 2024 -
    Seita SUGIMOTO, Naoya KUTSUNA, Shota TAMURA, Kaoru MATSUO, Takahiro TA ...
    2025Volume 31Issue 79 Pages 1579-1583
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    Urban environmental climate maps have been positioned as one of the measures against urban heat islanding and have been created based on urban climate research. However, with the development of climate change, it is necessary to create an urban environmental climate map that takes future climate change into account. This study compared summer temperature data for 2013 and 2024 to determine the temperature changes associated with climate change and the factors that influence temperature change. The results show that temperatures have increased and that there is variation in the rise in diurnal temperatures, particularly because of changes in sea breezes.

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  • Liangjun YIN, Daisuke MATSUI
    2025Volume 31Issue 79 Pages 1584-1589
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study aims to clarify the current situation of townscapes-control in surrounding areas of Important Preservation Districts for Groups of Traditional Buildings. Results as following; (1)84 surrounding areas have been designated around 62 preservation districts. (2)Many surrounding areas focused in preservation and utilization of historic townscape in there townscape-control policies. In addition, a lot of surrounding areas have contents about “place” which have definite relationship with preservation districts on target of concern. (3)The balance-type, which can consider both preservation districts and general area simultaneously, is the most numerous type.

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  • Yuanhong WEI, Daisuke MATSUI
    2025Volume 31Issue 79 Pages 1590-1595
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study aims to clarify the transition of facade design of Manchurian Architectures in Changchun after functional conversions. The results show that 39 buildings had changes, mainly in the northern Renmin Street area and northern Nan Square, with active conversions occurring from 1945 to 2012. Nearly half have undergone changes, including changes in openings, finishes, and advertisements, often to accommodate commercial uses. Trends reveal that before 2012, renovations focused on functionality, while after 2013, emphasis shifted to preserving historical value and harmonizing with the landscape.

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  • - Analysis using human flow data -
    Sota WADA, Daiki SHIGEMATSU, Keitaro OZAWA, Shota TAMURA, Takahiro TAN ...
    2025Volume 31Issue 79 Pages 1596-1600
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    Recently, walkable city planning has been promoted, and public spaces such as streets and squares are required to be comfortable for pedestrians and make them want to stay. The purpose of this study was to clarify the relationship between the distribution of pedestrians and the characteristics of the area by using human flow data to plan the arrangement of spaces for pedestrians to stay. The results suggest that there is a relationship between the amount of pedestrians and automobiles and the distribution of squatters, and that the factors influencing the distribution of squatters differ by time of day.

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  • - A case study of “Keyaki plaza” in Marugamemachi green, Takamatsu city -
    Chikara KITAHASHI
    2025Volume 31Issue 79 Pages 1601-1606
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    The purpose of this study is to clarify the characteristics of users’ passing and staying behavior in a city center plaza with a shopping street, using Keyaki Plaza (Takamatsu City, Japan) as a case study. The results confirmed that the shopping street is the main route for traffic, and that the entire plaza is more fluid after tenants begin their work. The behaviors within the city center plaza were classified into four types: direct passage, round trip, branching, and circulating, and the objectives and behavioral characteristics of users’ staying in the plaza were also clarified.

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  • Yuichi SUESHIGE, Yoshiumi OKAMOTO, Shohei OKAMOTO, Hideaki TAKAYANAGI, ...
    2025Volume 31Issue 79 Pages 1607-1612
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study aims to clarify the impact of logistics vehicles parked on roads on pedestrian walkability in a shopping district. For this purpose, experiments were conducted using VR simulations of different road environments, human flow rates, and types of logistics vehicles, and the data were analyzed based on walkability evaluation factors. The results indicate that walkability is influenced differently depending on whether sidewalks and roadways are clearly separated. Additionally, pedestrian walkability is particularly affected in environments with larger vehicle sizes and higher human flow. The study provides insights that will contribute to the future of roadway planning.

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Architecture System and Management
  • Mei SUGANUMA, Masato FUJIGA
    2025Volume 31Issue 79 Pages 1613-1617
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study summarizes the content and implementation details of the local housing culture element standards for application to the local housing culture incentive in the Regional Housing Greening Project. The element standards established were found to be divided into two types of those that clarify essential and priority items and those that simply select parts of traditional building techniques. And they indicated that in order to make the standards reflect the regional characteristics, it is important for a local government and businesses to collaborate while adjusting to local housing guidelines, etc. and continuously reviewing the standards.

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  • Ziyu JIAO, Masashi ENOKI, Aya ISHIGAKI, Hideaki SUMIKURA
    2025Volume 31Issue 79 Pages 1618-1623
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study compared project systems for small-scale remodeling construction in Japan and China. Specifically, we focused on the following aspects of the construction project structure: the classification of remodeling contractors based on cluster analysis; the scope of contracts for lump-sum contracting, owner-supplied contracting, and construction-only contracting; the organizational characteristics of remodeling contractors; and differences in the way remodeling construction is carried out.

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  • - Based on interviews with 13 workers -
    Rumiko SASAKI, Yuriko CHUMA, Yuki TAKEMURA, Tsuyoshi SEIKE, Tomoyuki G ...
    2025Volume 31Issue 79 Pages 1624-1629
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study clarifies the working environment for female construction workers in Japan. Semi-structured interviews were conducted for 13 female construction workers, in terms of working environment, challenges, and their own solution. This study shows that each female workers faced complex and diverse challenges, and struggle to balance between work and personal life in response to life events such as pregnancy and delivery, and reinstatement. In parallel, female workers strive to sustain work by consultation to employer regarding working hours, and with supports from family. This study suggests preparing a maternity/childcare leave system, diverse working style, and tolerant atmosphere.

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History and Theory of Architecture
Information Systems Technology
  • Akihiro MIZUTANI, Shinnosuke ICHIKAWA, Ryo SUMI
    2025Volume 31Issue 79 Pages 1678-1682
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    We have developed a metaverse platform that allows users to simultaneously experience computer-generated 3D models from first-person (VR) and third-person (AR) perspectives. Each visualization technology has been used to experience 3D models from a viewpoint that can be reproduced, and there has been no research and development aimed at synchronizing the technologies, especially the viewpoints. We have found that the information described in a 3D model can be systemized complexly by linking first-person and third-person experiences, and can be used as a more effective tool.

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  • - Comparison of VR experience and PC monitor viewing -
    So SHOJI, Yuichiro YAMABE
    2025Volume 31Issue 79 Pages 1683-1688
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study develops a VR-based interactive Genetic Algorithm (GA) system for generating street greening designs in resident participatory urban planning. The system comprises two stages: individual optimization, where users refine designs based on personal preferences, and consensus formation, where multiple preferences are merged. Experiments compared VR and PC-based evaluations, revealing that VR provided a more immersive experience, leading to more effective optimization and smoother consensus building. The study concludes that VR enhances engagement and decision-making in urban greening projects.

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  • Xin GUO, Yuichiro YAMABE
    2025Volume 31Issue 79 Pages 1689-1694
    Published: October 20, 2025
    Released on J-STAGE: October 20, 2025
    JOURNAL FREE ACCESS

    This study uses explainable machine learning models to predict traffic accidents and improve street design and road environments. Based on Japan’s traffic accident open-data, two datasets were created (pedestrians: 145,826 cases; drivers: 42,659 cases), then subjected to data-preprocessing and class-imbalance-adjustment. Six machine learning algorithms were applied to build 72 prediction models (36 each for pedestrians and drivers). With six evaluation metrics, the two best-performing models for each dataset were selected and refined through hyperparameter optimization. Finally, the SHAP method was used in case studies to analyze model interpretability, assessing suitability for both city-wide interpretation and localized analysis in accident-prone areas.

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