Online ISSN 2759-8578 Print ISSN 2189-7972 indexed in J-Stage https://www.jstage.jst.go.jp/browse/aiue/ The Journal of Asian Urban Environment is a scholarly publication dedicated to the study and analysis of urban environments in Asia. It focuses on various aspects of urban life, including sustainable development, urban planning, environmental challenges, and policy solutions specific to Asian cities. The journal provides a platform for researchers, policymakers, and practitioners to share insights, case studies, and innovative approaches to address the unique urban issues faced by Asian countries. It aims to contribute to the advancement of knowledge and the promotion of sustainable urban practices in the region.
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution 4.0 International License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
jaue2021-106: Research on Effective Three-Dimensional Composition in Large Spaces Using CLT and Issues During Construction
The diffusion of CLT(Cross Laminated Timber) in Japan has not progressed as expected. This is because of the non-uniformity of material standardization , legal issues , and difficulty in using CLT in terms of cost performance. On the other hand , the structural advantages of CLT itself and the shortened construction period due to the clarity of the construction method at the site are recognized as excellent materials. This project was planned and implemented with the aim of ensuring that future CLT buildings will be more effectively incorporated into plans and smoothly implemented during construction. By using large CLT , it was found that it is possible to construct a large space with a small number of members and a high strength structure that is lighter than concrete. In addition , we focused on the difficult work items during the construction process , which will serve as a guideline for future medium-scale buildings using CLT.
jaue2021-103: Analysis of Energy Use Performance of Distribution Centers Using Public Data
In recent years , logistics facilities in Japan have been developing due to the expansion of demand for online shopping. Logistics facilities have also become a target for real estate investment and are often evaluated by environmental performance assessment tools such as CASBEE. On the other hand , under the COVID-19 pandemic , CO2 emissions in households and logistics sectors tend to increase. In order to provide reference for environmental improvement in logistics , we decided to predict its increase rate of CO2 emissions. The study forces on distribution centers (DCs) that are considered as the typical logistics centers. Using public data , we conducted an overview survey of logistics facilities and estimated CO2 emissions per ton of cargo. Calculating the amount of packages delivered by several large express companies in Japan within 6 months of COVID-19 , the increase rate of CO2 emissions in logistics was estimated as 10.8% compared with the same period of the previous year. In conclusion , the CO2 emissions of logistics have increased significantly under the influence of COVID-19. With regard to the implementation status of energy conservation measures , it is expected that there is still space for equipment maintenance and introduction measures to be promoted.
jaue2021-107: Research on Seismic Damage Model of Reinforced Concrete Columns
The damage index model can quantitatively describe the post-earthquake damage degree of structure members , and provides a crucial theoretical basis for the safety assessment and repair of damaged structure members. In this paper , 91 groups of seismic test data of reinforced concrete (RC) columns were collected from the Pacific Earthquake Engineering Research Center (PEER) database. Four widely used member damage models were selected for calculation here. The damage development curve of the model and the development curve of the displacement angle between layers are compared and analyzed. The research results show that the development trend of damage index and damage curve predicted by the selected damage models are different for the same specimen. The Kratizg damage model and Niu Ditao damage model can evaluate the damage degree of structure members under the earthquake more accurately comparing to other models. In addition , the Kratizg damage model finally converged to 1 , and the development curve of the Niu Ditao damage model and the interlayer displacement angle showed a linear growth trend.
jaue2021-104: Research on 3D Spatial Printing Control Based on Gesture Recognition
3D spatial printing technology can better respond to complex construction requirements and improve the flexibility of design fabrication , which is a promising direction of future architectural construction. Currently , most 3D spatial printing is an offline printing procedure , which is gradually completed according to the printing path. However , there is still missing a good real-time control method to deal with virous problems in the printing process , such as the gravitational collapse of printing the spacial rods and the disconnection of the rods' nodes , etc. This paper trying to explore an interactive 3D printing method that based on human observation and gestures to control the printing process online in real time. Eight gestures were defined corresponding to the swhich action and six directions movement of the robotic arm. In the printing process , the camera is used to collect gestures in real time , and it could be recognized by the method of gesture posture estimation. At the samtime , the robotic arm could be controlled by the relevant actions according to the preset gesture information. The 3D spatial printing control method experimented in this article can respond to unexpected situations during the printing process , deal with unexpected printing problems in real-time , and produce better printing results.
jaue2021-108: Comparative Analysis of Cold Region Houses in China and Japan
In cold regions of China , district heating system is widespread , and there are many areas where the heat charge for housing is a flat rate. In such houses , there are many points that need to be improved in terms of thermal performance and energy consumption. Therefore , in this study , we conducted a survey and analysis of the thermal performance and energy consumption of houses focusing on Harbin in China , the birthplace of the author. At first , local climate data , existing residential forms , air conditioning system , and their lifestyle were investigated. Secondly , the laws and regulations related to energy conservation , thermal performance , surrounding environment , and energy consumption were investigated. Then we take a newly built multilayer apartment in Harbin as an example , we made a comparative analysis of the collected data with the houses in Hokkaido in Japan , which have been chosen as the comparison cities. As a result , the method of improving indoor thermal environment and energy saving of the houses were found out.
jaue2021-105: Prediction of Infectious Bacterial Counts and Analysis of Disease Transmission and Distribution in the Outpatient Department Depending on the Number of Visiting Patients
Recently , infectious diseases that originated from foreign countries were spread , leading to individual infections and mass outbreaks. The media and medical community predict that new infectious diseases would continuously occur and be introduced , causing mutations. While droplet infection can be minimized by hand washing and the rules of life , airborne infectious bacteria are spread to the outside due to the airflow , making them difficult to contain. Thus , appropriate measures should be prepared to prevent the indoor spread of airborne bacteria to those who spend most of their time indoors. Thus , we selected a space in the outpatient department of a general hospital that unspecified individuals visit and then measured the number of visiting patients , the volume of air ventilation , and the difference in air pressure between rooms. A ‘patient’s expected visiting schedule’ was generated by applying the number of visiting patients to an ML algorithm , and derived ‘predicted data for the generated airborne bacterial count’ with human CO2 emission and behavioral variables being applied. An airflow interpretation simulation was performed by using 2 ML algorithm models , which were used for the prediction of the direction of movement of airborne bacteria and its volume of transmission.
jaue2021-109: Survey on Energy Consumption and Thermal Environment of a New Government Building Introduced Environmental Facilities Part 3 Results Under Measures Against the COVID-19
In the Iizuka City , Fukuoka Prefecture , a new government building was completed in February 2017. As the basic approach for planning this building , the aim was to realize an environmentally-friendly office space capable of making a true contribution to environmental continuity by providing both eco-awareness and amenities. In this research , the results of a fiscal 2020 survey under measures against the COVID-19 , coronavirus disease-2019 , carried out to verify the effectiveness of these systems—in particular , results pertaining to the actual state of energy consumption and the thermal/air environment were indicated. Primary energy consumption per unit area was 714.58 MJ/(m2･year) , or 93.7% of the average value of 762.61 MJ/(m2･year) for the five years from fiscal 2012 to fiscal 2016 at the old building. In addition , compared to 664.01 MJ/(m2･year) in fiscal 2019 , it was a 7.6% rise. It became clear that ventilation by opening windows leads to the increase in energy consumption. The carbon dioxide concentration was within the standard range stipulated in the Management Standard of Environmental Sanitation for Buildings , and the thermal/air environment was sufficiently satisfied by mechanical ventilation without opening the windows.
jaue2021-097: An Integrated Design Model of Hybrid Rainwater-Graywater Systems (HRGs) Based on the Water Balance
Rainwater and graywater are the most common alternative water sources for building water conservation. Compared with stable graywater , recycling rainwater has been hindered by random and varied precipitation patterns , which requires reasonable design before equipment installation to avoid insufficient water supply. However , only harvesting rainwater is not meet expectations in some regions. A piece of efficient water-saving equipment , hybrid rainwater-graywater systems , is derived for greening buildings or net-zero city water. The systems can minimize the water consumption of the target building and can reduce the sewage discharge of the building. Previous study simulated the rainwater sub-system and the graywater sub-system independently for the designing of HRGs and made simple water balance assumptions for the graywater sub-system , which ignored the integrity of HRGs and made insufficient precision in subsequent calculations. There is still no suitable model to effectively simulate the operation state of HRGs. This paper aims to establish an integrated model for HRGs based on the water balance model to evaluate and optimize HRGs. The actual monitoring data of an HRG in a campus was used to test the integrated model. Modelling results show that the integrated model can reflect the operating state of HRGs well and can accurately simulate the equipment scale of HRG. The proposed model can provide a new method for the design and optimization of HRG in the future and simplify the calculation process of HRG.
jaue2021-102: Study on Urban Cultural Facilities Construction Affected by Policy in China
In China , many urban cultural facilities are state-owned. They are called "public cultural service facilities". As early as the founding of the People's Republic of China , the Chinese government began to guide the construction of urban public cultural service facilities in the form of government documents. The law on the protection of public cultural services , which was implemented in China in 2017 , stipulates that national laws protect the construction of public cultural service facilities. Whether in the form of official documents or national laws , a series of policies by the Chinese government has deeply affected the construction of public cultural service facilities in Chinese cities. Through the retrospective analysis of relevant documents and policies of the Chinese government , this paper builds a relationship between urban public cultural facilities construction and the policy , reveals the process of urban public cultural facilities construction in the Chinese context , at the same time , depicting the origin and development of urban public cultural facilities construction in China under the influence of policy.
jaue2021-096: A Case Study on Fire Risk Assessment at Accommodation Facilities Using Simulations of Fires
Living accommodation facilities have a heightened risk of casualties during a fire owing to their closed off rooms and narrow evacuation routes. Therefore , this study evaluates the risks during a fire when living in accommodation facilities by using a computer program to simulate a fire. Then , using the data collected , this study analyzes ways to reduce human casualties. As a result , this study shows that when no additional firefighting facilities responded , 76 out of 102 residents died. On the other hand , when a ventilation system was installed in the stairwell through which residents must pass , the death toll was reduced by 81.58%. Furthermore , when trained personnel gave oral instructions to reduce the delay in the reaction time , no casualties occurred.
jaue2021-098: The Influence of Chinese Landscape Painting in Song and Yuan Dynasties on Japanese Rock Garden
The origin and development of world civilization are diverse and multi-line. The art of every country and nation is the result of interweaving and infiltration under the influence of multi-culture. Chinese landscape painting in the Song and Yuan dynasties not only had a great influence on classical Garden art in China , but also had a profound influence on neighboring Japan. Based on the general understanding that Chinese landscape painting in Song Dynasty had a profound impact on Japanese landscape architecture , this paper focuses on the typical landscape painting style dry landscape courtyard to explore the spread and integration of landscape painting in Japan and the life experience of landscape architects. Through literature research , field investigation , combined with the theory of circulating paintings and painting , and on the basis of summarizing previous studies , the paper speculated and analyzed the influence of landscape painting in Song Dynasty on Japanese dry landscape construction , and tried to explore a new mode of studying Japanese traditional gardens from the perspective of painting.
jaue2021-100: A Study on the Accuracy According to the Number and Arrangement of GCPs in the Production of UAV-Based Ortho-Photograph
In order to make the most of the advantages of UAVs , research on orthogonal image production using UAVs is being actively conducted in the field of architecture. Many errors occur in the creation of UAV-based Orthophotos , and to minimize them , a ground reference point can be installed to ensure precision and reduce the error rate. However , looking at the studies so far , various comparative analyzes have been made on the effects of non-reference points and ground reference points on the X , Y coordinate values. The points for accuracy turned out to be relatively insignificant. Therefore , this study analyzes the accuracy according to the number and arrangement of ground reference points when producing orthographic images based on unmanned aerial vehicles , and proposes the optimal number and arrangement of ground reference points based on this. Through the analysis of existing studies , the tolerance range of the plane reference point that is less than 1/10 ,000 of the drawing scale was analyzed according to the aerial photogrammetry work regulations. In order to compare and analyze the accuracy according to the number and arrangement of GCPs , a relatively easy-to-model target site was selected and an aerial photographic experiment was performed.
jaue2021-099: Mapping , Visualization and Accuracy Analysis of Orthomosaic Using Drone Images
Photogrammetry using drone can produce high-resolution orthomosaic and acquire high-accuracy 3D information , which is useful. Therefore , this study attempted to determine the possibility of using drone-photogrammetry in park construction by producing a topographic map using drone-photogrammetry and analyzing the problems and accuracy generated during production. For this purpose , we created orthomosaic and DSM (digital surface model) using drone images and created topographic status map by visualizing them. Accuracy was compared based on topographic status map by GPS (global positioning system) and TS (total station). On the other hand , it was difficult to obtain accurate height values for terrain in which existed vegetation when producing the topographic map , and in the case of underground buried objects , it is not possible to confirm it in the image , so direct spatial information acquisition was necessary. Therefore , it is judged that the topographic status map using drone photogrammetry can be efficiently constructed if direct spatial data acquisition is achieved for some terrain.
jaue2021-101: Reliability Analysis for Each Failure Mode of Air Conditioner Parts
In Japan , there is a need to optimize capital investment and improve the efficiency of maintenance and management operations against the backdrop of aging buildings , longer service lives , and difficulties in securing skilled management engineers due to a declining population and aging society. For this reason , it is necessary to manage all information related to facilities in an integrated manner , and BIM is expected to be used as a method for this purpose. In this study , as an example of utilizing accumulated data , we proposed a method for predicting the service life of equipment using the maintenance records of an existing large facility that is 25 years old. In addition , we organized the information on maintenance management that makes such analysis possible. As a result , the maximum likelihood method was found to have a shorter failure life than the Kaplan-Meier method for all failure modes.
jaue2021-095: Cluster Analysis of Fire Risk in Traditional Markets on the Basis of Architectural and Human Characteristics
Evaluating the fire risk of buildings and establishing appropriate safety measures is very important , as a fire can cause heavy property damage and casualties. Traditional markets have high fire risks which proven to be real. To address these problems , this study conducted a cluster analysis of the traditional markets by considering the architectural and human factors to compare a cluster of building-type traditional markets.
jaue2021-094: Research About Storing and Utilization of Container Emergency House Which Can Be Used as Detached House After the Disaster
In recent years , as disasters have become more severe , opportunities for the use of temporary housing have increased. However , temporary housing in Japan has some issues that need to be resolved in terms of supply speed and housing performance. As a new temporary housing solution to these issues , we are developing a container-type transportable temporary housing. However , we have not yet been able to propose a social system for this. Therefore , the purpose of this study is to propose a social system for stockpiling and operating the container temporary housing. In conclusion , we will stockpile 4 ,500 units of container temporary housing nationwide , which is enough to cope with the frequent small to medium scale disasters (less than 10 ,000 temporary housing units required) that occur every year. We propose that these 4 ,500 container temporary housing units be distributed to each prefecture in proportion to the population multiplied by the natural disaster risk. In addition , this container temporary housing will be powered by solar panels to ensure profit from electricity sales , making it possible to offer them for about 4.6 million yen in real terms.
jaue2021-091: Development of Algorithm for Disaster Waste Detection Using DeepLabV3+
In this study , we proposed the development of a new algorithm that enables quick and easy detection of waste in a specific situation , by combining image classification and deep learning methods. The subjects of detection were all types of wastes that could be generated not only in individual buildings , but also in regional districts during calamities such as floods , fires , and earthquakes. The images taken from the front of the waste as Normal case , and those taken from the top as Hard case , for their use as data. Semantic segmentation was performed on the obtained data using DeepLabV3+ to analyze the results of normal case and hard case , and the accuracy was calculated to be 0.802 and 0.634 , respectively. Through the results , the limitations according to the characteristics of the image were confirmed , and it is expected that the performance can be improved through additional experiments in the future.
jaue2021-093: Survey on COVID-19 Measures for Evacuation Centers in Fukuoka Prefecture
In recent years , with the increase in damage caused by natural disasters , the importance of evacuation has been pointed out more than ever before. Evacuation centers are one of the most important evacuation sites for residents , and various studies have been conducted on their establishment and operation. In particular , new measures are required to cope with COV-19 infection , and various innovations are needed to meet the actual conditions of evacuation centers. Therefore , we surveyed basic municipalities in Fukuoka Prefecture on the status of measures against infectious diseases including COV-19 in evacuation centers. As a result , the following findings were obtained. 1. In some areas , the number of evacuation centers doubled as a countermeasure against COV-19 , and in other areas , the space available for evacuation increased. However , the use of hotels and inns was not observed due to the lack of suitable facilities. 2. Regarding partitions , there were partitions for disasters such as corrugated cardboard , and partitions using items available on the spot such as ping-pong tables and ball nets. There were also some facilities that used tape to separate people from each other to prevent infection.
jaue2021-092: The Proposal of Energy-Independent Stocked Emergency Housing
In Japan , emergency housing has been provided in past natural disasters. However , the length of time to offer and the quality of them have become issues. To provide emergency housing more quickly in the event of severe damage in the future , it is necessary to be able to cope with unrepaired and unstable infrastructure. However , a detailed study of how to design and operate emergency housing to accommodate this situation has not been conducted. Therefore , this study clearly explained how to provide energy-independent emergency housing by modifying the stocked container emergency that has already been proposed and creating an operational method. First , the emergency housing was converted into ZEH (Zero Energy House)-type using a power consumption simulation tool. Next , for ZEH type emergency housing , the power storage was calculated with power generation and consumption on good and bad weather days in summer and winter. As a result , it was clarified that if the use of hot water supply by solar power generation is stopped in bad weather in winter , the indoor environment can be kept good by air conditioning , lighting , ventilation system.
jaue2021-088: Correlation Between Fire Prevention Education and Fire Damage Through Statistical Analysis
Although fire prevention education , which is one of the methods of fire prevention , is being provided by various institutions , it is necessary to statistically analyze the effectiveness of fire prevention education as a result of reducing fire damage. Evaluation of the effectiveness of fire prevention education through experiments in previous studies has a limitation in that it is impossible to analyze the long-term effects. Therefore , this study intends to evaluate the effectiveness of fire prevention education based on statistical analysis of fire prevention education and fire damage. To analyze the effectiveness of fire prevention education , 'statistics of residents who received fire prevention education' and 'data on fire damage' were collected for 6 years in Seoul. After normalizing the collected data , correlation analysis and regression analysis were performed. As a result of the analysis , the correlation coefficient r and the coefficient of determination R2 were close to 0 , and it was found that fire prevention education had no effect on the reduction of fire damage. Based on the results of this study , the relationship between fire prevention education and fire damage can be understood , and it is judged that it can be used as basic data for future fire prevention policies.
jaue2021-090: A Pre-Study on Developing the Korean Regional Fire Coping Capacity Evaluation Model
Modern society is experiencing rapid economic growth but also facing more fire risks and the damage comes with it. Facing more and more fire losses , it is important to understand the ability of communities and individuals to adapt to the impact of disasters. Through the investigation of previous research , this article found that using qualitative and quantitative methods to evaluate community fire response and fire vulnerability , and is often used as a method for risk reduction and disaster recovery. We redesigned the questionnaire framework and questions according to the previous research in combination with Korean laws , regulations , and Fire Response Manual. This model can be divided into two major parts , and each of them consists of numbers of question related to the field of fire-fighting. As for its objective , it is to measure both Individual and Community's fire coping capability by quantify the data(results) collected through the application of this model. At the same time , the stochastic confidence test was conducted for the questionnaire items , the reliability of the questionnaire is verified (All items' ICC Score in this model are over 0.6). Which laid a research foundation for the implementation of the questionnaire in the future.
jaue2021-089: A Study on Construction Site Workers' Recognition of Construction Site Fire Hazard Factors and Fire Prevention Measures
Fires occur infrequently , but fires at construction sites , such as the 2020.04 Icheon warehouse construction site fire in Korea (death: 39 people) , cause great casualties and property damage when they occur. A number of studies on construction site hazard factors have been conducted. However , there have been few studies on construction site fire hazard factors. Therefore , in this study , the purpose of this study was to find out whether the workers who work at the construction site are recognized of the fire hazard factor at the construction site and are familiar with the countermeasures. Based on actual accidents , 6 fire hazard factors were imaged. And a survey was conducted on construction site workers (47 people). Afterwards , an interview was conducted on whether the people was recognized of the recognized fire hazard factors and fire prevention measures. As a result , construction site workers were the most recognized of flame neglect as a fire factor and were recognized of facility fire prevention measures.
jaue2021-087: The Current Situation of the Urban Renaissance Safety Security Plan
In Japan , the "Urgent Urban Renewal Area" has been set up to enhance international competitiveness and is focusing on urban development. However , following the Great East Japan Earthquake in 2011 , national resilience was promoted , and "Urban Renaissance Safety Security Plan systems" were established and "Urban Renaissance Safety Security Plan" were formulated in urban areas. In addition , it is necessary to make a partial amendment in 2016 to describe matters related to the maintenance of facilities that provide a stable supply of energy necessary for ensuring the safety of people who have difficulty returning home , operations , and administrative functions. But it has never been properly investigated. Therefore , the purpose of this study was to understand the current situation of the government agencies that formulated the "Urban Renaissance Safety Security Plan" and the private companies that are cooperating with the plan. As a result , it was found that the contents of the plan were not substantial , and there were many obstacles to the operation of the plan , especially in terms of cost. In addition , it became clear that there are many areas where cooperation with private companies has not progressed smoothly.
Jaue2025-028 Research on Optimization Strategies for Old Residential Areas Based on the Mechanism of Spatial Form Elements Influencing Microclimate: A Case Study of Xi'an City
Against the dual backdrop of urban expansion and climate change, the urban heat island phenomenon has become increasingly severe. As the predominant land use type within built-up areas, residential districts constitute the primary contributor to the urban heat island effect. Among these, the renewal and redevelopment of old residential areas has become a key focus of urban regeneration efforts, due to numerous issues such as poor environmental conditions, dilapidated buildings, and low resident happiness indices. This study selected three representative old residential areas based on their spatial layout and conducted field measurements during winter. Using ENVI-met software, the current microclimate conditions of these typical residential areas were simulated. Twenty sites were selected as samples based on the types of human activity spaces. Through correlation analysis and multiple regression analysis, the relationships between various spatial form elements and microclimate variations were thoroughly investigated. This has resulted in the development of a regression prediction model for microclimate variations in old residential areas. Research indicates that factors such as green space coverage, tree density, and building footprint exert a more pronounced influence on air temperature and relative humidity, whereas the impact of building area is comparatively less significant. Consequently, this paper proposes corresponding outdoor environment optimization strategies based on these analytical findings. These strategies provide a scientific basis for the improvement and renewal of old residential areas, thereby supporting enhanced climate adaptability and the creation of healthy, livable environments within urban residential districts.
Copyright (c) 2026 Qingyang Feng, Duo Xu, Dian Zhou (Author) https://creativecommons.org/licenses/by/4.0
Jaue2025-013 Correlation Analysis between Air Quality and COVID-19 Transmission: A Case Study of Chicago
Since the emergence of COVID-19 in the United States, all aspects of the entire country have been greatly affected. Everyone felt sad for the death of lots of people who appeared in the virus. Is virus product of environmental impact? A virus from the environment has caused such large casualties to humans. From another perspective, will COVID-19 have an impact on the environment? It is not just COVID-19. When any epidemic occurs, will it have an impact on the environment? My project took Chicago as an example to research the air environmental quality in Chicago in recent year. In what ways has COVID-19 affected Chicago’s air quality? In other words, is there any social connection between them? Can the quality of the air influence people to have a higher chance of getting COVID-19? Many papers prove that long-term air pollution will cause more respiratory diseases because people’s respiratory systems have damaged. What levels of environmental pollution people stay are exposed to leads to higher infection rates. The emergence of COVID-19 is a warning. Whether our environment is also affecting people’s chances of getting sick. Is there any connection between the impact on Chicago’s air quality during the pandemic and the explosive increase in the number of patients? And how to deal with the impact of the pandemic on air quality in the future. The pandemic is not only one, but we should also prevent any future simultaneous attacks of environmental problems and diseases that may arise.
Copyright (c) 2026 Journal of Asian Urban Environment https://creativecommons.org/licenses/by/4.0
Jaue2025-014 A Lightweight Predictive Control Strategy for Building Rainwater Harvesting Systems under Extreme Rainfall Conditions
Building-scale rainwater harvesting (RWH) systems increasingly face operational stress under intensifying short-duration rainfall, yet most installations continue to rely on passive rule-based control with limited ability to adjust storage ahead of storm events. This study develops a forward-looking operational framework that incorporates short-term rainfall forecasts into a standard hourly water-balance model through a predictive pre-release mechanism. The method evaluates potential exceedance of storage capacity over a seven-day horizon and adjusts release volumes based on projected inflow–storage interactions while maintaining physical constraints and supply reliability. The framework was applied to the campus RWH tank at the Kitakyushu Science and Research Park using hourly rainfall and non-potable water demand data for 2022. Comparative simulations using identical inflow and demand sequences show that predictive adjustment alters the temporal structure of discharge by lowering storage levels in advance of high-inflow periods, thereby reducing peak overflow without affecting annual rainwater use or municipal supplementation. Sensitivity analysis across multiple storage capacities indicates that the operational benefits of predictive control depend on the interaction between tank size and anticipated inflow pressure, with diminishing marginal improvements once structural capacity exceeds a threshold. The results indicate that forecast-informed operation can enhance the adaptability of decentralized RWH systems under non-stationary rainfall regimes and may complement structural design measures in future system planning.
Jaue2025-011 Mechanical and Durability Properties of Concrete Incorporating Blast Furnace Slag and MSWI Molten Slag as Fine Aggregate Replacements and Supplementary Fly Ash
This study investigates the mechanical and durability performance of concrete incorporating blast furnace slag (BS) and MSWI molten slag (MS) as fine aggregate replacements, with supplementary use of fly ash (FA) as a partial cement substitute. Six mix proportions were prepared: three mixtures with 30% FA and BS replacement ratios of 25%, 50%, and 100%, and three mixtures with BS and MS at 50% each, with FA contents of 0%, 15%, and 30%. The experimental evaluation focused on compressive strength, drying shrinkage, creep, and pore structure. The results indicated that replacing sand with BS generally improved compressive strength, whereas the inclusion of MS tended to reduce it. Drying shrinkage strain was reduced in concretes with combined MS and BS compared to those with BS alone, indicating a shrinkage-mitigating effect of MS. For creep, mixes with higher BS content exhibited lower creep strain, whereas MS-BS mixtures showed increased creep strain with higher FA replacement levels. Pore structure analysis revealed that water curing promoted the pozzolanic reaction, resulting in reduced total pore volume. Overall, BS and MS had little influence on the total pore volume, whereas higher FA replacement increased the volume of pores smaller than 0.01 µm. These findings provide insights into the potential of BS and MSWI molten slag as sustainable fine aggregate alternatives.
Jaue2025-002 Tourist Impact on Sustainability of Chinese Village Architecture
In this study, we analyzed 1,629 tourists' comments on Ctrip and other platforms through ROST CM6 text analysis and ROST EA sentiment analysis to explore the sustainable consumption preference of traditional village architecture in Qiandongnan. The study found that tourists have a high preference for the cultural authenticity and ecological adaptability of iconic architectural elements such as drum towers, footstools and wind and rain bridges, but strongly resist the erosion of the “original ecological” landscape by “commercialization”. Sentiment analysis showed that 69.71% of the comments were positive, mainly due to the preservation of the architectural features, while 29.62% of the negative sentiments were focused on the separation of form and spirit caused by excessive remodeling. Based on this, we propose to construct a diversified financing mechanism based on tourists' value perception, and guide the upgrading of consumption preferences by optimizing the tourism experience, so as to provide a practical path for the sustainable inheritance of traditional village architecture.
Jaue2025-012 Simulation and Verification of Pocket Park Thermal Comfort Based on Ladybug Tools
This study takes the pocket park on the east side of Yuehui, Chongqing South Road, Shibei District, Qingdao as the research object, aiming to explore its thermal comfort environment characteristics in summer and verify the applicability of parametric simulation tools. The research comprehensively uses field measurement and numerical simulation methods to monitor the microclimate of three types of functional spaces in the park in typical summer days, and uses Ladybug Tools to build a refined model for UTCI simulation. The results show that there is significant spatial differentiation in thermal comfort of park, the green shade area has the best effect, and the thermal stress of hard pavement square is prominent. The simulated data are in good agreement with the measured data (error 0.3-2.5 ℃), which verifies the reliability of the method. However, the research is limited to a single sunny day in summer, and the simulation accuracy of complex vegetation ecological process is still insufficient. In the future, it is necessary to carry out long-term research on multiple seasons and cases, and integrate users' subjective perception to deepen relevant conclusions.
Jaue2025-023 Toward Improved Cooling: Field Investigation of Summer Thermal Environment in Classrooms of Hot Summer and Cold Winter Regions
Teaching buildings in the Hot Summer and Cold Winter (HSCW) Regions commonly experience high temperature, high humidity, and insufficient ventilation efficiency during summer, particularly under conditions without active cooling. However, targeted investigations into the spatial distribution characteristics of indoor thermal environments and the auxiliary role of fans under such conditions remain limited. To explore the effectiveness of fan assistance in improving thermal uniformity under natural ventilation, this study selected university classrooms in Chengdu as the case study. Field measurements were conducted in two unoccupied classrooms during a representative teaching period in September, and indoor thermal parameters were continuously monitored under two conditions: natural ventilation (NV) and natural ventilation with fan assistance (NV + Fan). Particular attention was given to the vertical distribution characteristics at four heights: 0.1 m, 0.6 m, 1.1 m, and 2.6 m. The results indicate that, in the absence of active cooling, indoor air temperature fluctuations were significantly smaller than those outdoors, suggesting that the thermal inertia of the building envelope can mitigate the impact of short-term outdoor heat disturbances to a certain extent. Compared with the NV condition, the average indoor air temperature under the “NV + Fan” condition increased slightly, while vertical thermal stratification was substantially weakened, with the maximum temperature difference between the upper and lower layers reduced by approximately 30%. Meanwhile, the vertical relative humidity difference decreased from approximately 10% to 1%–5%, demonstrating that fan operation effectively enhanced indoor air mixing and improved the uniformity of temperature and humidity distribution within the classroom. The findings suggest that, although fans may not directly reduce indoor air temperature in university buildings located in the HSCW Regions, they can serve as an important auxiliary measure for natural ventilation by significantly optimizing the spatial thermal environment distribution of teaching spaces. This study provides practical implications for low-energy summer operation strategies in educational buildings.
Copyright (c) 2026 Quyi Gong (Author) https://creativecommons.org/licenses/by/4.0