Proceedings of Symposium on Human-Environment System
Online ISSN : 2434-8007
Current issue
Displaying 1-50 of 61 articles from this issue
  • Pages Cover1-
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Pages Cover2-
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Pages App1-
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Pages App2-
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Pages App3-
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Pages App4-App14
    Published: 2021
    Released on J-STAGE: December 03, 2022
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  • Miwako KOMATSU, Shigeko SHOYAMA
    Pages 1-2
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    To clarify the current status of personal safety reflector use for traffic accident prevention, a questionnaire survey was conducted involving elementary, junior, and senior high school students in Kumamoto Prefecture, and responses were obtained from 458.The rate of recognizing personal safety reflectors was approximately 80%, but only 45-54% possessed them. Although approximately 80% answered that personal safety reflectors are effective for traffic accident prevention, the rate of not wearing personal safety reflectors at the twilight time was 61-64% among junior/senior high school students, and 40% among elementary school students. As they had been involved in near-miss events even when wearing personal safety reflectors while walking, it was also suggested that personal safety reflectors are not sufficiently effective. Most of the personal safety reflectors they desired to possess were easy to carry, wearable as an accessary, and simple.
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  • Go Iwashita, Satoru Yamasaki
    Pages 3-6
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    CO2 concentration, air temperature and relative humidity were monitored in an elderly care facility at Tokyo under COVID-19 calamity. This facility included a day service room and special nursing rooms for the aged where unit care style was adapted. The frequency of opening windows was different among communal rooms. The time series of CO2 concentration was analyzed based on the behavior of opening windows.
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  • -Comparison between young with and without a geriatric simulator-
    Maki MIYOSHI, Rio TAKAGI, Shigeko SHOYAMA
    Pages 7-8
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to prevent accidental ingestion of tablets among the elderly population, we compared the ability of individuals to distinguish colors of press-through packs (PTPs) for a white tablet. A total of 58 colors were used, and healthy female volunteers (n=20, age: 20-39) were asked to distinguish colors with (“simulated elderly group”) and without (“young group”) geriatric simulation glasses. Both the vision and total score for color perception were significantly lower in the simulated elderly group compared with the young group. In the simulated elderly group, the total score for color perception was higher in individuals with greater vision. A significant difference in the average score of color perception was observed in 31 of 58 colors, and the average score was significantly lower in the simulated elderly group. Since we used commercially available oral medicines for samples, many of the samples had similar colors. As a result, subjects tended to make errors with adjacent colors and similar color tones.
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  • -A Study from the Perspective of the Presence or Absence of Co-Eaters
    Naoki Matsubara, Mayu Ohta, Takumi Tamura, Naoki Awajitani, Yuhui ...
    Pages 9-12
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this study is to understand the actual situation of the eating environment of college students' residences by focusing on the situation of co-eaters and cooking space, and to consider the factors that improve food satisfaction. A questionnaire survey was conducted for university students. The items of the questionnaire were the condition of the cooking space, the condition of the co-diners, the satisfaction of the housing, and the satisfaction of the dinner. The following were clarified. 1) The overall satisfaction of the kitchen was related to the increase in the frequency of cooking due to the improvement of kitchen dissatisfaction, and dissatisfaction with the kitchen was one of the factors for avoiding cooking in both the single and cohabitation groups. 2) For the cohabitation group, the number of cookers should be three and the type of faucet should be lever, while for the single group, the number of cookers should be two or three and the type of cooker should be gas or IH. 3) Those who were highly satisfied with their housing were also highly satisfied with their kitchen as a whole. 4) Household type and eating together were related to the level of satisfaction with dinner.
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  • Yayoi SATSUMOTO, Ayana TAKAYAMA, Sachie OYA
    Pages 13-16
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to clarify the effect of a cooling pad attached to the back of a school backpack, experiments were conducted in an artificial climate chamber with two types of cooling pads (BP and WP) of different materials and without a cooling pad (NP), to compare heat and moisture transfer and physiological responses. As a result, there was no significant difference in the subjective vote, but the mean value of comfort was more uncomfortable without pads. Although the cover factor of WP was larger than that of BP, the moisture permeability resistance of the materials was about the same, suggesting that the thinner thickness of BP led to the difference in cooling effect. 
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  • Miyu YAMAMOTO , Tetsuya KATAYAMA , Sigeko SHOYAMA
    Pages 17-18
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    We designed 72 touch panel screen patterns with backgrounds of green colors, varying in brightness and saturation, and white letters, and asked females aged around 20-39, who were divided into young and simulated elderly (wearing glasses for aging simulation) groups, to evaluate the legibility and designability (impression) of each pattern. Both groups gave a score of 5 or more to green backgrounds with low brightness and medium saturation in terms of legibility and designability. The minimum contrast ratio recommended by the WCAG2.0 is 4.5:1. However, in the present study, samples with contrast ratios lower than this were also favorably evaluated, suggesting the necessity of examining the standard value for each hue.
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  • Kosaku MIZUTANI, Yoshihisa MOMOI, Seiichi MIYAMOTO, Ryuichiro YOSH ...
    Pages 19-22
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to understand the convective heat transfer from each part of the human body surface when exposed to a steady air flow, experiments were conducted using a thermal manikin (TM), heat flux sensors, and radiant heat flux sensors. The experimental results for the convective heat transfer coefficient(CHTC) were compared with the experimental formulas of the previous research and the results of CFD analysis. The CHTC for the whole body of TM was close to the experimental formula of the previous research, and there was no significant difference from the CFD analysis. For each part of TM, the local CHTC calculated from the heat flux measured by the heat flow sensor was compared to the averaged CHTC of each body part calculated from the heat generation value of TM.
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  • Haruka AOKI , Maki MIYOSHI , Shigeko SHOYAMA
    Pages 23-24
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to prevent accidental ingestion of tablets among the elderly population, we performed an experiment to simulate the ability of an individual to select appropriate press-through packs (PTP)-packaged medicine while referring to a medicine handbook. A total of 44 samples were prepared using a different combination of print colors (10 vivid tones (red, orange, yellow, yellow-green, green, blue-green, blue, blue-purple, purple, red-purple) and black) and lines (no line, 1 thin line, 2 thin lines, 1 thick line). In the experiment, we asked 20 healthy female volunteers to select appropriate medicine while wearing a pair of geriatric simulation glasses, which simulated the symptoms of cataract and yellowed vision. We demonstrated that the color of PTP had a greater effect compared with the number and type of lines. The average score for distinguishing appropriate medicine was high for orange, yellow, yellow-green, and green, and was low for blue-green, glue-purple, and red-purple.
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  • Kahori GENJO
    Pages 25-28
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Based on a nine-year utility bill survey and hearing survey of four school facilities attached to the Faculty of Education of Nagasaki University, the energy consumption characteristics was clarified by analyzing the actual state of primary energy consumption of each school. Furthermore, the primary energy consumption characteristics of school facilities in other regions was compared to that of the schools targeted for this study, and energy conservation measures were examined according to the energy consumption characteristics of each school, based on the actual energy consumption.
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  • Ayako YASUOKA, Toshihiro MUKAI , Toshiyuki MIYANAGA
    Pages 29-32
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to improve the productivity of factories, we conducted a web-based questionnaire survey on production processes and work environments for factory workers. We received responses on the heating/cooling temperatures handled in the production process, the methods and types of air conditioning equipment, and the thermal environment of the workspace and its evaluation. Although the heating/cooling temperature of the products varied depending on the product and production process, the actual temperature around the workers was lower in winter than in summer. One of the reasons for this could be that the structure of the factory, which is easily affected by the outside temperature, affected the thermal environment. And the results showed that the main reasons for dissatisfaction with the thermal environment were heat radiation from production equipment and burning of the face in the summer, and cold hands and feet in the winter. These results suggest that production equipment, work content, and susceptibility to outside temperature may have affected the selection of air conditioning equipment, the thermal environment, and the evaluation of workers.
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  • − Handmade calibration blackbody furnace using a standard thermometer −
    Hironobu KAJII, Shoji IGAWA, Sakuo SUGAWARA, Tadahiro TSUCHIKAWA, Seii ...
    Pages 33-36
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Body temperature measurement is popular to confirm the disease of the new coronavirus. In particular, the use of non-contact thermometers, which have a short time for measurement, is increasing. When the skin surface such as the forehead is measured with a radiation thermometer that used to measure radiant energy, it shows about 34 ° C instead of 36.6 ° C. Therefore, this committee planned to try commercial products such as non-contact thermometers and to confirm their usage method and measurement of accuracy. We have already introduced a simple method for making a calibration furnace using a standard thermometer. However, the method of selecting a thermometer to be used at the same time cannot be overlooked. In order to improve reliability, the calibration method of the basic inexpensive standard glass thermometer with 1/10 scale will be described. IR thermometers showed around 30.6 ° C when the skin surface temperature was measured without any mode setting. However, when the skin surface temperature was measured by using human body mode of the thermometer, they showed 35.5 ° C to 35.8 ° C. In other products, it indicated Lo and could not measure. Therefore, it is necessary to understand the characteristics of the device and desirable to prepare the temperature calibration furnace shown in this paper.
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  • Kohei Oba, Masashi Yoshida
    Pages 37-38
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In recent years, with the introduction of air conditioning systems in schools, there has been a growing interest in the indoor thermal environment. In our school, the air conditioning is centrally controlled according to the standards set by the Ministry of Education, Culture, Sports, Science and Technology. However, our school building consists of two buildings, one in the northeast and the other in the southwest, and the classrooms exposed to sunlight are different depending on the time of day. In order for students to live comfortably in the school, it is necessary to understand the temperature and humidity in all classrooms and control them appropriately to meet the standards. Therefore, in the year before last, our laboratory constructed a system for observing the thermal environment in the school. The purpose of this study is to analyze the trend of changes in the thermal environment of classrooms using statistical methods based on the temperature and humidity data of each classroom collected by this system in order to understand the thermal environment in the school. In this paper, we conducted a multiple regression analysis using the daily average data in Hachioji as the objective variable and the four nodes as explanatory variables. The results showed that the laboratory on the fourth floor in the northeast direction had the most influence on the objective variable.
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  • Kana Ohmoto, Mizuki Nakajima, Kimie Nakajima, Kenichi Egawa, Takes ...
    Pages 39-40
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    With Japan's super-aging society, the elderly workforce is expected to be a major source of labor, as the labor force of those aged 65 and over accounts for 13.2% of the population. However, among the various workplaces, cooking workplaces are said to have a large physical burden due to the current situation where labor is often not standardized. Therefore, the purpose of this study was to develop a standard work procedure using ergonomics in the food preparation field, and to examine the elements to construct an efficient, safe, and comfortable work environment. In this study, items for ergonomic measurement and evaluation were examined as preparatory work for field measurements to develop a standard work procedure.
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  • Part 1: Changes in the evaluation of living environment
    Ikuko BAMBA, Saki KONDO, Toshimi TANAMURA, Megumi MITSUDA
    Pages 41-42
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The lifestyle and living environment of residents have been changing with the times, and it is thought that the position of odor in residents' evaluation of their living environment and their awareness of their living environment has also been changing. The purpose of this paper was to clarify the changes in the residents' evaluation of their living environment by comparing the results of surveys conducted in 1990 and 2000 with the same content. As a result, it was found that the level of satisfaction with the living environment has increased with the change of the times.
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  • Part 2: Awareness of odor in the house
    Saki KONDO, Toshimi TANAMURA, Ikuko BAMBA, Megumi MITSUDA
    Pages 43-44
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The lifestyle and living environment of residents have been changing with the times, and it is thought that the odor felt in the house has also been changing. The purpose of this paper was to clarify the changes awareness of odors in the house and odor quality felt in the house by comparing the results of surveys conducted in 1990 with the same content. As a result, it was found that degree of odor discomfort in the house has decreased with the change of the times. In addition, it was found that the quality of the odor felt in the house is also changing with the changing times.
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  • Tomoya FUKUNO, Satoru TAKADA
    Pages 45-48
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In winter, low humidity often occurs in offices even in operation of humidification. It is necessary to reveal the humidification rate of each case and to consider ways to deal with low humidity. In this study, we estimated the humidification rate of air conditioners at the office room based on the air moisture balance equation with acquired or estimated values (indoor/outdoor temperature and humidity time series data for the office, ventilation rate, moisture generation rate from human body, etc.). Then, we confirmed the validity of estimation using measured absolute humidity of the air outlet of the outdoor air conditioner. Finally, we analyzed parameter sensitivity for estimated humidification rate. The result showed that the number of occupants and ventilation rate had a relatively larger effect on the estimated results, while the quantity of moisture absorption/desorption from the porous materials affects at the starting of humidification and had a smaller effect on the trends of the whole day.
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  • Naoki OKAMOTO, Shinichi WATANABE
    Pages 49-52
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The objective of this study was to clarify the effect of parasol fabric color and polyurethane (PU) coating on reducing UTCI. The measurements were carried out from July 21 to 23, 2021 on a tennis court, lawn, and concrete surfaces at Daido University in Nagoya, Japan. The thermal parameters under four parasols including Parasol (silver), Parasol with PU (white), Parasol with PU (silver), and Parasol with PU (white + shading net), as well as in the sun as a reference, were measured. Following findings were obtained through the measurements. Among the parasols used in this study, the white parasol had the largest solar shading effect and the smallest increase in downward heat radiation caused by the rise in fabric temperature due to solar absorption. The MRT value under the parasols were affected by the radiation characteristics of the parasol fabrics (solar shading rate and downward heat radiation increase rate) and the ground surfaces (albedo and solar absorptance). On the tennis courts, the largest UTCI reduction was -3.6 °C for Parasol with PU (white + shading net), followed by -3.0 °C for Parasol with PU (white), -2.6 °C for Parasol with PU (silver), and -1.4 °C for Parasol (silver). The UTCI reduction of the white parasol was greater than that of silver one.
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  • (Part 3) Evaluation on safety based on examination of blood pressure on winter morning for inhabitants in residential houses in each prefecture in Japan
    Shinji YOSHIDA
    Pages 53-56
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, the present situations on the safety of thermal environment in residential houses in winter season were evaluated by using the BEST-H program, a computation tool for analyzing the thermal load in residential houses. In this analysis, the climate conditions for each primary division area in Japan were imposed to the input conditions for the thermal load computations. We also evaluated the safety of thermal environment with the hazard rate for both the cardiac and the brain diseases from the combination between the computational results by using the BEST-H program and the several statistical data. Through the investigations, it was clarified that the proposed method was validated for the evaluation of the safety on the thermal environment in the residential houses in winter season by comparing the computational results with the statistical data from the Population Survey Report in Japan.
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  • Field survey in courtyards and indoors within Machiya in summer
    Tomoka SATOMI, Shinji YOSHIDA
    Pages 57-60
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this study is to examine the relationship between thermal environment and natural ventilation within Machiya in Naramachi, which is the old city of Nara, by conducting field measurement about thermal environment in summer. In this study, we measured the following variables in and around the house: air temperature, humidity, wind velocity, globe temperature, horizontal solar radiation, the difference of pressure between the front and the back courtyards, etc. Thorough the investigation, the following three knowledges were clarified: (1) The surface temperature on the soil was cooler than that pebbled with small stones in the back courtyard, (2) The indoor air temperature was cooler than the outdoors, (3) The wind velocity at the zashiki room (a tatami room) was strongly affected by the velocity at the front courtyard than that at the back courtyard. The future direction of this study is to examine the relationship between the flow and the thermal environmental fields by using CFD analysis.
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  • Kanoko ITO, Satoru TAKADA
    Pages 61-64
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    As a pilot study to examine the effect of wearing a mask on microclimate around the eyes and the tear film, an experiment was conducted on one subject. Physical and physiological parameters were measured with and without two types of face masks—a non-woven fabric mask and a nylon cloth mask—in an air-conditioned room set at 28 °C and 23 °C. As a result, air velocity and absolute humidity around the eyes and estimated tear evaporation rate tended to be higher when wearing the masks. In addition, these values were higher with the nylon mask than with the non-woven fabric mask; it may be due to the difference in air permeability and face-fitting characteristics between the masks. The air velocity was 1 m/s or more with the nylon mask, while it was 0.2 m/s or less without masks. On the other hand, air temperatures around the eyes were 27.5 to 31.5 °C regardless of room temperature and mask-wearing conditions. Although the effect of mask-wearing was not clearly observed in ocular surface temperature and blink pattern, a decrease in ocular surface temperature after blinking tended to be larger when wearing the masks.
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  • Hiroki Segawa, Ryusuke Yasuda, Atsumasa Yoshida, Shinichi Kinoshit ...
    Pages 65-68
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In recent years, heat stroke due to thermal load on the human body has become a serious issue. The effects of thermal load on the human body are deeply related not only to external factors but also to internal factors such as physical condition and state of activities. In order to investigate the state of seasonal acclimatization of the human body during the hot season, we conducted an experiment in which subjects rested in a standing position in a hot environment before and after seasonal acclimatization. The subjects were exposed to a hot environment in a climate chamber room. During the hot period, there was a decrease in core temperature and metabolic rate, and an increase in perspiration in some subjects, but the differences were not significant, and the correlation between metabolic rate and core temperature was also not significant and clear relationship between them was not found. Meteorological data suggested that heat acclimatization in this year was formed in June July temporarily resolved to some extent in mid-August.
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  • -Measurement of Moisture Absorption and Desorption on the Wall in the Actual House-
    Teruaki MITAMURA, Ryota IMAI
    Pages 69-72
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In recent years, the commercialization of interior materials with humidity control functions has been advancing, the conventional method for evaluating humidity control performance generally depends on the weight change of the test piece, and it could not be an evaluation method assuming application to an actual space. In this study, we focus on the principle of the ventilation capsule used in sweating systems and develop a method for directly measuring moisture absorption and desorption of building materials in the actual environment. In the previous report, the device based on the principle of the ventilation capsule was made by oneself, and the measurement accuracy was verified from the examination on the diameter of the capsule and the ventilation rate in the capsule. This paper reports the result of measuring the moisture absorption and desorption on the wall surface in the actual house using the developed equipment.
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  • Kento NAGAI, Atsumasa YOSHIDA, Shinichi KINOSHITA
    Pages 73-76
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this study, we evaluated the effect of parasol shielding on the human body. An outdoor subject experiment was conducted on a sunny day in summer. In the experiment, air temperature, humidity, wind speed, radiation, floor / sunshade / globe temperature were measured as environmental measurement, and skin temperature at seven points, core temperature, metabolism, blood flow, and weight change were measured as physiological measurement and psychological reports of warmth, comfort, and fatigue were measured. From the experimental results, there was a large difference in the amount of sweating, the rise in core temperature / mean skin temperature, and the thermal sensation between sunny and under parasol area when standing (low metabolism). There was a difference in the amount of sweating during walking (high metabolism). In addition, multiple regression analysis was performed to analyze the effects of environmental factors and metabolic rate. The effects of items other than wind speed could be confirmed on the amount of sweating, especially the amount of metabolism and parasol. It was confirmed that the core temperature change was affected only by the amount of metabolism, but the effect on other items could not be confirmed.
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  • Hiroaki HIDA, Atsumasa YOSHIDA, Shinichi KINOSHITA
    Pages 77-80
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The effect of wearing a mask while walking in hot environment on physiological quantity changes was investigated by subject experiments. An exercise load experiment by treadmill was conducted under three conditions: outdoors in summer at a walking speed of 4 km/h, a basic condition (air temperature, relative humidity, and walking speed was 30℃, 40%, and 4.0 km/h) and a high-load condition (35℃, 60%, and 5.5 km/h) in an artificial climate chamber. In the outdoor experiment, wearing a mask resulted in differences in metabolic rate, core temperature increase, and sweat rate. On the other hand, in the basic condition in the artificial climate room without the effect of solar radiation, only the sweat rate was different. The effect of wearing a mask was not observed in the high load condition. The effect of wearing a mask during walking was expressed in sweat rate due to the inhibition of respiratory heat release and became smaller when air temperature was higher. In addition, under outdoor conditions, it was also expressed in metabolic rate and core temperature increase by the effect of exhalation resistance.
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  • Aika SUZURI, Satoru TAKADA
    Pages 81-84
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The aim of the study was examination of the validity of the skin swelling and shrinking model for long-term changes in skin water content. First, seasonal change of skin water content distribution was analyzed from experimental value. In summer, the estimated thickness of stratum corneum was about 21% larger and water content at boundary between stratum corneum and granulosum layer was about 8% higher than in winter. In the area within 2 μm from the outermost surface of the stratum corneum, the moisture content was larger and moisture content gradient was smaller in the summer than in winter. Next, the moisture content in stratum corneum was calculated under 4 different calculation conditions: basic condition, conditions considering sweating in summer, conditions considering moisture permeation resistance of sebum, and conditions considering decrease in water content at the boundary between stratum corneum and granulosum layer in winter. By considering the seasonal difference in water content at the boundary between the stratum granulosum and the stratum granulosum, the thickness of the stratum granulosum in summer exceeds that in winter by about 9 to 20% throughout the experiment. This result was in agreement with the measured value in terms of the direction and scale of change.
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  • Naoshi Kakitsuba
    Pages 85-90
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Domain of the man and his environment system is widely varied as related to human activity. I have studied mainly on six different categories; evaluation of environments in a hyperbaric atmosphere, thermal physiology, urban climate, science of clothing, lighting environment, and sleep environment. All the categories share two keywords; seasonal change and psychological/physiological responses. In this paper, four categories are briefly introduced.
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  • Part3 VAV System Simulation
    Tatsuki KAJITANI, Shizuo IWAMOTO, Ayano DEMPOYA, Shigeki KOYASU
    Pages 91-94
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The thermal load of the air conditioning in the house and the indoor environment are predicted by simulation. The VAV method by the whole housing air conditioning is compared with the partial intermittent operation by the domestic air conditioner. In particular, the annual frequency distribution of the room air temperature in the rooms and corridors is evaluated. We will build a simulation of the VAV system for air conditioning in the entire building and try to evaluate it using the frequency distribution of the room temperature in the living room.
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  • Part 1 Construction of experimental equipment systems
    Seiki HAEMORI, Harumi KAGAWA
    Pages 95-98
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this study is an experimental study for coziness assessment of cardboard beds. In this report, experimental equipment systems were constructed. These systems can simultaneously measure changes over time in subjective data and objective data and can store all measured values as digital data on a PC. Subjective data are psychological and physiological quantities such as the resident's mood scale, brain waves and sweating, and humans grasp the surrounding space. Objective data is environmental physical quantities such as temperature and humidity, and the measuring device grasps the space that residents spend.
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  • Tadahiro Tsuchikawa, Emi Kondo, Yoshihito Kurazumi
    Pages 99-100
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    People with spinal cord injury who have difficulty controlling body temperature require a long time to excrete. In winter, special heating for the lower body is required. The purpose of this study is to propose the optimum position and shape of the panel heater that warms the lower body in the toilet space from the viewpoint of heat radiation. The configuration factors between the points on the side wall surface and the human body were measured by a photographic method using a fisheye lens in one healthy young male. As the result, it is recommended that the panel heater on the side wall with respect to the lower body should be centered on the position of the subject's knee back.
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  • Naomi SASSA, Michiyo AZUMA, Hiroko KUBO, Chiaki KIDO, Tomoko OBAM ...
    Pages 101-102
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this survey is to examine the temperature that effectively encourages the start of use of air conditioners as a measure against heat stroke in the elderly. The study was conducted based on the results of experiments and previous studies. As a result, it was considered necessary to encourage the use of air conditioners at temperatures slightly higher than the comfortable temperature of the elderly.
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  • Takako FUKAZAW
    Pages 103-106
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Whole body and local thermal comfort sensations have been discussed through the study in which 10 elderly Japanese females took a part in the experiment voluntarily. The experiment was conducted in the thermally neutral condition of around 28 °C and 50 %RH for 85 min. Although the subjects kept a rest condition on a chair during the whole period of the experiment, they put their legs and feet to a hot water bath controlled at 42 °C between 40 min to 70 min in the experiment. The subjects were kept in thermal comfort states in the whole body and each location. However, they felt thermal discomfort in both the whole body and each location at the end of the immersion. The voted thermal comfort sensation decreased with the increasing skin wettedness for both the whole body and each location. Their linearity relations were, in addition, found to be significant, respectively (p < 0.05). The thermal comfort limits expressed by the skin wettedness were obtained as the whole body: 0.08 ± 0.04 (-), forehead: 0.05 ± 0.13, chest: 0.15 ± 0.06, scapula: 0.13 ± 0.07, forearm: 0.15 ± 0.03, thigh: 0.05 ± 0.04, respectively; these limits were significantly different (p< 0.05).
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  • Akihiro YAMAGISHI
    Pages 107-110
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this study is to clarify the relationship between blood pressure (home blood pressure) and thermal environment in daily life. In this paper, as a pilot study, we measured home blood pressure for about one week in autumn using a wearable sphygmomanometer. The survey targeted one adult male and collected blood pressure data for 11 days on weekdays from September to October 2021. The measurement schedule was at waking up, at work (every hour), and at bedtime. As a result, blood pressure measurement confirmed the peak of diurnal variation from 10:00 to 11:00 and 20:00 at work, and the low value of blood pressure at wake up, 14:00, and bedtime. In addition, a significant difference was observed in blood pressure by time zone (at the time of waking up, at work, at bedtime), and it was confirmed that the blood pressure status changed depending on the time zone. In the thermal environment, a relationship with the outside air temperature was observed in the autumn measurement without using air conditioning. In particular, the relationship between the minimum temperature and blood pressure, which is related to the effects of cold on the human body, was suggested.
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  • Yuko KASAHARA, Saki MATSUURA, Shigeko SHOYAMA
    Pages 111-112
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    To clarify the appropriate sizes and shapes of plates on which to serve hospital meals to patients with loss of appetite, this study compared impressions of a hamburger steak, such as portion (hamburger steak) size perception of food, when served on “round plates-rimless”, “round plates-rimmed”, “square plates-rimless”, and “square plates-rimmed” of differing sizes. With a ratio of the hamburger steak diameter to plate diameter or side of 0.45-0.55 as the boundary, the hamburger steak looked smaller on larger plates due to the Delboeuf illusion. On evaluation plates of the same size, the hamburger steak looked slightly smaller on rimless or round plates than on rimmed or square plates.
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  • Nao TSUMAKI, Mizuki NAKAJIMA, Kenichi EGAWA, Kimie NAKAJIMA, Takes ...
    Pages 113-114
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Due to abnormal weather caused by global warming, sleep disorders due to the hot and humid conditions in the hot season are regarded as a problem, and a means to obtain a healthy sleeping environment in the summer is desired to prevent human error. In this study, it was investigated effect of ice slurry intake and positively lowered the core body temperature at the time of falling asleep to verify that it led to falling asleep. Seven female and one male participated in this study. They ingested ice slurry before falling asleep. The purpose of this study was to investigate effect of pre-cooling by ice slurry intake before their own sleeping. It was examined whether the quality of sleep was improved by the ratio of non-REM sleep time by wearable sensors. It was recorded the situation in which the quality such as temperature and humidity in their own sleeping room. Also sleep time was comprehensively evaluated in each sleep environment of the subjects. The obtained deep sleep time was not predominant in the presence or absence of ice slurry before falling asleep. There were 411 night sleeps in this study. There was no significant difference between ice slurry sleep and control sleep. However, as a result of individuals, there was a tendency for long-term deep sleep due to ice slurry inoculation.
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  • Analysis of airflow distribution near the eyes using computational fluid dynamics
    Taketo SHIMIZU, Satoru TAKADA
    Pages 115-118
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    To clarify the effect of indoor convection air conditioning on eye dryness, computational fluid dynamics was used to analyze the effect of airflow caused by the outlet of a convection air conditioner and upward flow along the skin due to heat from human body on airflow distribution near the eyes during cooling and heating. The air velocity and temperature from the outlet assumed for cooling case were 3.5 m/s, 25˚C, respectively, and the blowing angle was 30˚, and those for heating case were 5.0 m/s, 30˚C, and 60˚, respectively. The air velocity at the face reached 0.6 m/s at most. In these cases, the vertical velocity component was larger and the airflow directly hit the face. It was also shown that the closer the angle of the blowing airflow was to the downward vertical direction, the more likely it was that the wind hitting the desk surface or other surface would increase the airflow velocity near the face.
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  • Part 2: Estimation of Ventilation and Heat Transfer Rate Based on Computational Fluid Dynamics
    Atsuki ICHIKAWA, Satoru TAKADA
    Pages 119-122
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In order to clarify the air conditioning load caused by the ventilation through the opening of a store and to study improvement measures for energy saving, computational fluid dynamics (CFD) analysis was conducted for a store that operates in summer with its opening open to the outside air while the air conditioning was in operation, and the air and heat transfer at the opening was determined. The analytical results were compared with the measured results of air temperature and wind velocity distributions at the opening, and the points that need to be improved in the model were clarified. In addition, the results of the CFD analysis were compared with those of the ventilation calculation based on the temperature difference between the room temperature and the outside air, and it was shown that the ventilation rate calculated by the ventilation calculation was larger than that by CFD analysis.
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  • Hinako MIZUHATA, Tsuyoshi HASHIMOTO, Miyako URAKAWA
    Pages 123-126
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The objective of this study is to clarify the characteristics of mandarin orange warehouses as landscape resources in Tsukumi City, Oita Prefecture, Japan. Field surveys of mandarin orange warehouses in Aoe, Tsukumi, Chinu, and Nagame/ Urashiro of Tsukumi City were carried out in 2019, 2020 and 2021. 719 mandarin orange warehouses were confirmed in the survey areas. The elements were arranged according to the land use, the location of the mandarin orange field, and the characteristics of the mandarin orange warehouses. Based on the results of the analysis, seven representative landscapes related to citrus cultivation in Tsukumi City were extracted.
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  • Noriko KAIHARA, Motoya HAYASHI, Satoru TAKADA
    Pages 127-130
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The purpose of this study is to determine the indoor humidity environment that prevents discomfort and diseases caused by dryness, in order to reduce the health risks of the elderly in low humidity conditions. In this study, in order to clarify humidity conditions that feel dry and physiological factors under these conditions, physiological factors (skin moisture content and skin surface temperature) were measured, and psychological factors (thermal comfort votes and thermal sensation votes) were evaluated, in the case of elderly and other subjects under constant low humidity conditions (RH10%, 28℃). From the results of the skin moisture content and the thermal comfort votes suggested that the skin moisture content of some elderly subjects who may feel comfortable was to decrease under the humidity condition where the skin moisture content of many elderly subjects decreased and felt uncomfortable. From these results suggested that the elderly were not only slow to experience discomfort with changes in the condition of the skin and mucous membranes due to dryness, but also may not notice a decrease in moisture content.
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  • Drinking water situation of workers and thermal environment at construction rest area
    Satoru SASAMORI, Shunsuke SOMEYA, Keita YAMAZAKI, Koichiro FUJISAK ...
    Pages 131-134
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    Measured results were presented for the thermal environment of rest areas at construction sites that requires ventilation to prevent Covid-19. Construction workers drink less water than young adults and children during sports. The temperature at the rest area was lower than that at the work site, but some people took a break in the smoking area, which had the same level of thermal environment as the work site. In the subjective evaluation of the break time, workers who took a break in the smoking area felt heat stress. Construction workers had the same evaporating loss as young adults, however the amount of water intake was the same as that of the elderly, resulting in higher dehydration. Workers who wear both the ventilated working jacket and the ventilated trousers have a lower dehydration than those who wear only the ventilated working jacket. Therefore, the combined use of both can be expected to further reduce the dehydration.
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  • Part3 Detailed analysis during heating by unit model
    Ryo FUJIMOTO, Shizuo IWAMOTO, Ayano DEMPOYA
    Pages 135-138
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    For the purpose of evaluating the indoor thermal environment of the lecture room, a large-scale lecture room is modeled as a unit, and ceiling blowout, radiant panel, etc. are set as the air conditioning system, and CFD analysis is performed to evaluate detailed indoor thermal environment. Was done. In addition, assuming that the class format in the lecture room will change in the future due to the influence of the new coronavirus that is spreading these days, we examined the seating situation in consideration of social distance. As a result, EDT is also comfortable in many cases where PMV is comfortable even in a seated situation considering social distance.
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  • Ayaka KANI, Ineko TANAKA, Satosi AIHARA
    Pages 139-140
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In Japan, energy conservation in houses is accelerating to achieve the target of reducing greenhouse gas emissions. In this situation, inner envelope was proposed, that ensures thermal insulation with the spatial configuration of non-residential space and partition walls. However, the thermal environment has not been discussed yet. In this study, actual measurement survey was conducted to clarify the issues of the indoor thermal environment in summer in the house retrofitted with inner envelope. As a result, it was confirmed that the room temperature rises due to solar radiation. Furthermore, to improve thermal environment in summer, the effects of solar shading, cross ventilation, and air conditioning were investigated by simulation. It was found that solar shading is effective in improving the thermal environment of habitable room during the daytime.
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  • - A Case Study of One-room Type Facility -
    Shinya TANEICHI, Ineko TANAKA
    Pages 141-142
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this study, CFD analysis was used to examine the effect of environmental adjustment acts on indoor air quality of nursery facility in urban area. As a result, it was confirmed that even with a ventilation volume of 30 m3/h per person, air was stagnant in the 2-year-old area separated by furniture. The use of ceiling fans was confirmed to have sufficient air circulation effect even in low operation. In addition, the window-opening ventilation had a significant effect on reducing the CO2 concentration, and the effect on the entire ventilation path was confirmed after 8 minutes. These results confirm the necessity of taking specific adjustment methods for space with stagnant air as the infection control measures.
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  • -From the perspective of living and the environment -
    Tetsumi HORIKOSHI
    Pages 143-148
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    The history of Nagoya's urban development begins with "Kiyoshu Goshi. " Therefore, throughout the Edo period, the skeleton of the present central part of Nagoya was formed. In the Meiji era, Nagoya was transformed into a modern city plan in response to the wave of modernization. In the latter half of the Showa era, town development for reconstruction from the war damage was carried out. Projects such as the construction of the famous 100m road and the mass relocation of the graveyard was carried out. In modern times, town development is being carried out to improve the living style and environment. Both the Sakae and Nagoya Station areas are being redeveloped at the same time. Especially in the latter case, it is linked with the opening of the Linear Shinkansen. In such a history of Nagoya's urban development, the author will introduce the characteristics of Nagoya or Nagoya City by focusing on characteristic events centered on the perspectives of living and the environment.
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  • Part 1: Field survey in shopping district and estimation of energy loss due to opening
    Satoru TAKADA, Isao SHIMIZU
    Pages 149-152
    Published: 2021
    Released on J-STAGE: December 03, 2022
    CONFERENCE PROCEEDINGS FREE ACCESS
    In shopping streets, it is common to see stores operating with the openings facing the street open while air-conditioning the inside of the store. However, there is concern about the energy loss caused by the ventilation through the opening. In this paper, we surveyed the room air temperature and opening area of the stores along a shopping street in Hyogo Prefecture while the air-conditioners are working in cooling mode during summer, and at the same time, calculated the amount of energy loss due to ventilation through the openings based on ventilation calculations for the sake of estimating the potential energy savings.
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