著者

湯淺 和博 鶴崎 敬大 山崎 成

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.82, no.741, pp.949-955, 2017 (Released:2017-11-30)

参考文献数

16

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The demands of photovoltaic generation (PV) are increasing as the public eco-awareness grows, but there is concern of enormous volume disposal of PV panels in the near future. It is calculated by Ministry of the Environment that if the PV panels life expectancy were 25 years, its final disposal amount reaches 800,000 ton in 2040. And its disposal amount is equivalent to 6% of the present final disposal amount of whole Japan. Considering the load to future's final disposal site, its influence can't be ignored any more. For this reason, some companies are already working to develop the recycling method of PV panels in Japan. However, details of its reductive effect of environmental load is not so certain. So the purpose of this study is to uncover the reduction in CO2 emissions by the recycling of PV panel's glasses (main constituent materials of PV panels are glasses which accounts for more than 50 % by the weight ratio.) through the inventory analysis. At first, we carried out hearing survey on PV panels disposal service vendors, recycled products manufacturers and so on, in order to grasp component materials of PV panels (5 kinds of PV panels were targeted in this research), manufacturing process of recycled products, specification of prosessing apparatus, etc. Then we set two flow charts based on hearing survey. First are proposal procedures that are processes of PV panel's glasses recycling to ceramic tiles, paving blocks, and sound proof panels. Second is currently procedure as a comparison that is process of PV panels recycling to roadbed materials (we also considered that currently procedure is landfill disposing without PV panel's glass recycling). We calculated respective procedure's CO2 emissions per PV panel ton treatment by the inventory analysis. The followings are the main findings of this study: ·Each of PV panels are composed of different materials ratio, so there are difference of reduction in CO2 emissions between respective PV panels. ·At the time of recycling to ceramic tiles, it was confirmed that the fuel consumption in the baking process can be reduced 33 % by using glass, not a natural raw material like a feldspar. Therefore, the substantial CO2 reduction effect was suggested. ·Recycling to ceramic tiles, paving blocks and sound proof panels using glass of PV panels gave more than 10 % CO2 reduction ratio, even when any PV panels were subjected. It was the case when CIGS PV panels are recycled to sound proof panel that the CO2 reduction ratio becomes biggest, and its CO2 reduction ratio was 61%. ·We showed that which productization or occasion of PV panel kinds are able to get the amount of CO2 reduction beyond 140kg-CO2. It was the case when CIGS PV panels are recycled to ceramic tiles that the amount of CO2 reduction becomes biggest, and its amount of CO2 reduction was 441.6kg-CO2. ·Amount of CO2 reduction didn't become substantial minus effects in the comparison even when the currently procedure is landfill disposing. Combined with the volume reduction of final waste, it is suggested that PV panel recycling reads to significant reduction of environmental load.

著者

奥田 紫乃 福本 陽子 原 直也 岩井 彌

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.75, no.649, pp.255-260, 2010

被引用文献数

2 1

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This study finally aims to clear the appropriate lighting conditions for kitchen work. In this report, we conducted the experiment on the subjective evaluation for cutting and peeling, under a variety of conditions of light source, illuminance, light color, and light direction. Subjects evaluated &ldquo;Brightness&rdquo;, &ldquo;Visibility&rdquo;, &ldquo;Task Performance&rdquo; and &ldquo;Satisfaction&rdquo;.<br>As the results, it was cleared that the evaluation for &ldquo;Task Performance&rdquo; is high, under conditions that task light is diffused light and high color temperature light, and that the evaluation of&lsquo;the satisfaction of lighting environment for kitchen work&rsquo;was different by the light direction under the same conditions of illuminance on the work table.

著者

山川 莉加 関根 諒 宗方 淳

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

no.757, pp.235-243, 2019-03

被引用文献数

3

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&nbsp;Light control systems using motion sensor save energy consumption in office efficiently. It is also known that rapid change of illuminance might cause unpleasantness to workers. To solve this problem several researches studied the relation between workers' perception and the way of dimming of luminaires around workers, however they did not focus the effect of the light source color. Although there are many discussion and doubt, Kruithof curve is a famous theory, that there are pleasant or unpleasant combination of illuminance and color temperature. Here our question arises that workers' perception on the change of illuminance might be influenced by the impression of the combination of illuminance and color temperature before and/or after the fluctuation.<br>&nbsp;Thus, we conducted three experiments in an experimental room, focusing two points. The first was perception of different color temperature in a room with achromatic, that is white wall, and the second was with different color temperature and chromatic wall color. The size of the room is W3.5m x D3.5m x H2.7m. In the achromatic phase, three color temperature, 3000K, 5000K and 6500K were presented by LED luminaires on the ceiling. In the chromatic phase the same three (or two of 3000K and 6500K) color temperature were combined with four wall color, orange, pale orange, blue and pale blue, covering existing white walls with color cloth of 1.5 m height from the floor. In one session of the experiment color temperature and wall color were fixed to one and illuminance was fluctuated several times with different ending level and speed randomly. Starting illuminance was fixed to 750 in this research, and ending illuminance and speed were decided according to the existing research. 20 students participated at every experiments. During the session, participants were doing a task to search about one question with a laptop PC and write down the findings on a paper, and also instructed to fill the questionnaire every time they perceived the change. Dimmed illuminance recovered to the starting level with longer seconds. At the end of the experiment, participants evaluated the pleasantness of the room with each of the all combination of wall color, color temperature and illuminance at the stating/ending time of the change.<br>&nbsp;The results show that with white wall the perception ratio is statistically lower at 5000K than at 6500K. There is some tendancy that the perception ratio is relatively higher when the color of lamp and wall is similar ones, that is, blue wall and 6500 K or orange wall and 3000 K, though this tendency was not found when the color of wall was pale, whitish one.<br>&nbsp;Finally, participants' evaluation of pleasantness on each combination of wall color, color temperature and illuminance before and after the change were compared to the perception ratio of the experiments. It was found that negative subjective impression of the combination before/after the change leads to higher perception and positive impression show the opposite results.

著者

坂田 克彦 中村 芳樹 吉澤 望 武田 仁

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.82, no.732, pp.129-138, 2017 (Released:2017-02-28)

参考文献数

20

被引用文献数

1 3

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Studies have previously been undertaken on the prediction of perceived spatial brightness aimed at achieving designs that take account of a feeling of brightness of space, and various estimation models and factors affecting the prediction of perceived spatial brightness are known. In this study the authors focused their attention primarily on factors other than average brightness to explain perceived spatial brightness in nonuniform luminance distribution with the aim of proposing an index which encompasses existing knowledge while being based on simple quantities. The authors set 32 different lighting conditions in an office with north-facing windows and measured the luminance images for each condition. They then asked subjects to evaluate the perceived brightness from two seats, one with the windows in sight and with no windows in sight, thereby providing 64 different luminance distribution and estimation value samples. Ten contrast images of different spatial frequency were decomposed from each luminance image by wavelet transformation symlet6, then AD (ambient directivity, low spatial frequency) and CD (contrast detail, high spatial frequency) were defined on the basis of each variance of contrast image. The authors used multiple regression analysis to obtain a multiple regression equation to explain spatial brightness using three variables: average luminance, or NB value; AD; and CD. AD lowers spatial brightness, while CD raises it. The estimated accuracy was greater than that achieved using a conventional equation. After considering the above, the authors suggested NSB (Natural scale of Spatial Brightness), a spatial brightness prediction model based on luminance contrast.

著者

長谷川 兼一 鍵 直樹 坂口 淳 篠原 直秀 白石 靖幸 三田村 輝章

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.86, no.780, pp.197-204, 2021 (Released:2021-02-28)

参考文献数

21

被引用文献数

2

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A recent meta-analysis of dampness in homes has shown that dampness and mold in indoor environments are factors in approximately 30-50% of all respiratory and asthma-related health ailments. Although the specific indoor dampness factors related to such issues have yet to be fully explored, there are clear and urgent needs for improved architectural techniques and optimized occupant behavior patterns that can prevent or eliminate excessive dampness inside buildings. Furthermore, if the underlying structures linking dampness to adverse health effects could be more closely estimated through epidemiological surveys, prevention methodologies for serious problems related to indoor dampness might be discovered. With these points in mind, we previously proposed a home dampness estimation method based on occupants’ self-reported answers to questions regarding indoor dampness during winter. This resulted in an indoor dampness index covering a range from 0 to 24 that classifies houses into four ranks, with those in Rank 4 presenting the most serious dampness-related problems. To clarify the relationship between home dampness levels and indoor environmental quality, another questionnaire survey was conducted and several physical environmental items such as indoor temperature, humidity, and microbial flora from floor dust were measured in 119 detached East Japan houses during the winter season. Herein, we describe the surveyed results and the distribution of the dampness index. The questionnaire also included child health-related symptoms that show onsets within 3 months, and the prevalence of each symptom is presented in relation to each dampness index rank. The characteristics of indoor temperature and humidity resulting from home dampness levels were also clarified by comparing the dampness index and measured results of these physical items. Analyzing the survey results, we found that the prevalence of nasal- and eye-related symptoms increased approximately in tandem with the dampness index ranking. In particular, more than 50% of the children residing in Rank 4 homes reported nasal problems, and there was a high prevalence of throat and skin symptoms in Rank 3 homes. However, despite these values, there are still no clear links between the dampness index and the reported health-related symptoms. Next, the statistical values of temperature, relative humidity, and the humidity ratio during evening time in living rooms and bedrooms were analyzed for each dampness index rank. To test the significance of these associations, Kruskal-Wallis testing was performed to determine whether the samples in each dampness index rank originate from the same distribution. Moreover, the significant differences among each rank’s samples were tested in multiple comparisons. As for temperature results, no significant association was found among the dampness index ranks. This presumes that living room temperatures are affected by heating behaviors at the time of occupancy. On the other hand, both the relative humidity level and the humidity ratio were found to be strongly associated with the dampness index rankings; with higher humidity levels in the living room and bedroom presaging higher dampness index ranks. In addition, the relative humidity and humidity ratios in Rank 2, 3, and 4 living rooms were significantly higher in comparison with Rank 1 living rooms, while the median relative humidity values in Rank 4 living rooms and bedrooms were around 50% and 70%, respectively. Significantly, the humidity ratios in Rank 4 homes were found to be the highest among the surveyed houses and it was expected that these houses had severe environmental problems related to indoor dampness.

著者

小島 隆矢 若林 直子 白川 真裕 彭 博 伊丹 弘美

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.86, no.784, pp.578-589, 2021-06-30 (Released:2021-06-30)

参考文献数

21

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1. Background and objectiveThis study examines the methodology of "individual scaling method" in order to value each person's vocabulary and viewpoints. "Individual scales" refers to evaluation items made by subjects' own terms. Thus, these scales are different from person to person. In the previous report, we proposed principal component analysis (PCA) method for evaluation data measured by individual scales. In this PCA method, evaluation object is regarded as observations, and individual scales of all subjects is regarded as variables. And, individual difference in vocabulary and viewpoint is described as difference in distribution of factor loadings vectors in principal component space. Therefore, it is difficult to analyze individual difference of each object. In this paper, methodology for analyzing individual differences of each object in individual scales method was studied and proposed.2. Methodology of analysisFor the above purpose, the application method of "partial score" used in the analysis method called MFA (MultipleFactor Analysis) was discussed. And the following method was proposed.1) Exclude subjects with low correlation between partial score and global score (principal component score).2) Use "standardized partial score" to analyze individual differences for each object.3) Correcting techniques for "ipsative data" may be necessary when analyzing individual or group differences between multiple objects.In addition, using "HCA (Hierarchical Component Analysis)" as the analysis method is expected to improve the performance of partial scores.3. Case studyAs a case study, a survey on positioning analysis for dental clinic was conducted. The background, purpose and method of this survey were described.4. Analysis and discussionPCA, MFA (Block-based PCA), and HCA were applied to the case study data, and the following results were obtained.1) The output principal component scores did not differ between the methods.2) HCA was the best in the performance of statistical tests for partial scores. This shows that reliability of partial score by HCA is higher than that of other methods.3) It was found that the positioning of the dental clinic is different between those who are positive for visiting dental clinic and those who are not.5. Consideration on Methodology of AnalysisBased on the results of analysis as a case study, methodology was further considered. First, as a criterion to exclude subjects with low correlation between partial score and global score , “R-square≧0.4” was proposed. Next, how to use FA and PCA properly was considered, and necessity of correcting techniques for "ipsative data" was discussed.6. Future tasks and prospectsThe future tasks are to apply the proposed method to many cases. And, using partial scores, it seems possible to analyze individual scale method data, including different objects for each person. It is also a future task to consider this method.

著者

王 美 楠 須永 修通

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.82, no.734, pp.347-355, 2017

被引用文献数

3

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&nbsp;Economic growth and improvements in living standards have resulted in an urgent demand for comfortable and healthy building environments, and this has led to a sharp increase in energy consumption in China. Therefore, in order to achieve a good balance between environmental quality of indoor thermal environment and energy consumption, it is crucial to identify the actual residential energy demand and its influencing factors. In this study, the annual energy demand for a typical multi-residential building in China was dynamically simulated, and the influence of building thermal performance and air-conditioning setting temperature was studied for each climate zone in China. The results show that energy saving strategies in China should be implemented accordingly in response to different climate and geographical conditions. In the severe cold and cold climate zones that require greater levels of heating in winter, air tightness of building should be considered a priority, as better air tightness can deliver a significant heating energy reduction, whereas the quality of the wall insulation is the main contributor to the indoor thermal environment in winter for all climate zones. On the other hand, in the south of China, where comfort in summer is the main concern, the improvement of external window performance and the addition of external shading are the key issues that need to be addressed. Compared with the poor effects of lowering heating temperature in the north of China, raising cooling temperature in the south is relatively effective method to save energy without causing a sharp deterioration of the indoor thermal environment. It may be realistic to reduce energy consumption and ensure the quality of indoor thermal environment in multi- residential buildings by using the appropriate climate-responsive energy-efficient measures.

著者

徳村 朋子 高橋 祐樹 桑山 絹子 和田 一樹 黒木 友裕 高橋 幹雄 秋山 幸穂 高橋 秀介 篠田 純 中川 純 田辺 新一

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.86, no.783, pp.441-450, 2021-05-30 (Released:2021-05-30)

参考文献数

19

被引用文献数

6

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As a measure to prevent the spread of COVID-19, telecommuting has been recommended by many companies since March 2020 in Japan. Even after the COVID-19 pandemic is over, the telecommuting implementation rate, including working from home, may continue to increase.The purpose of this study is to clarify the impact of working from home on the individual satisfaction and productivity of workers in companies that introduced the telecommuting system from April 2020 as a countermeasure against COVID-19.Questionnaire surveys of workers who normally work at an activity-based working office were conducted in order to compare the effects of working from home and at the office. The survey targets were workers of a research and development institute located in Chiba Prefecture, Japan. Approximately 210 employees work in the facility, of which 85% are researchers and 15% are in clerical positions. In this study, the results of three questionnaire surveys are described. We conducted a survey of “conventional office work period” in February 2020, a survey of “recommended work from home period” in April 2020, and a survey of “combined work from home and at the office period” in July 2020 where workers could choose to go to work or work from home.From the survey results, it was found that the working environment at home had large individual differences, and the illuminance and CO2 concentration levels often deviated from the standards of the “Ordinance on Health Standards in the Office”. Despite the environment with large differences, the satisfaction level of the thermal environment, air quality and sound was significantly higher at home. It was also found that when working from home, self-efficacy regarding control of the indoor environment increases. This is considered to be one of the reasons for the increase in satisfaction of environmental qualities at home.As an advantage of working from home, most office workers chose “reduction of coronavirus infection risk”. Next, more than half of the respondents chose “having no commuting stress” and “having a reduced dress code” as advantages. On the other hand, “lack of face-to-face communication” became the highest disadvantage of working from home. The degree of satisfaction with interpersonal communication was significantly lower at home than at work. In particular, the decrease in the satisfaction of informal communication was large.Compared to the period when workers could only work at the office or at home, the period with relative freedom to choose between both options showed a great increase in the satisfaction with the work environment and a decrease in the difficulty of performing office activities.In addition, a high correlation was found between the frequency of working from home and commuting time. Workers with longer commuting hours tended to work at home more frequently. Furthermore, it was confirmed that the higher the frequency of working from home, the higher the degree of satisfaction with the working environment at home.The most common response to the ideal rate of working from home was two times a week, but the actual rate was only 25% in the survey conducted in July. It is presumed that there were many situations in which employees chose to come to the office in order to proceed with their work duties more efficiently.

著者

谷本 潤 萩島 理 田中 尉貴

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.74, no.640, pp.753-757, 2009-06-30 (Released:2010-01-18)

参考文献数

13

被引用文献数

1

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An improved cellular automaton model based on Yanagisawa & Tomoeda , Nishinari (2007) was established, where both Static Floor Field and collision effect were considered. Several model parameters were carefully determined by going through a turning process based on experimental data provided by other previous studies. Both results by simulation based on the model and analytical approach derived from the so-called Mean-Field Approximation proved that the outflow rate from an evacuation exit, usually estimated by the so-called flow coefficient, can be improved by putting appropriate obstacles in front of the exit. This is because the appropriate allocation of obstacles can deflate collision probability at the exit by increasing collisions around the obstacles before the exit.

著者

矢部 周子 原 直也 原田 和典

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.84, no.758, pp.377-384, 2019 (Released:2019-04-30)

参考文献数

23

被引用文献数

2

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Recently various lighting designs have become required more than ever. In order to closely examine and appropriately design various light environments, highly accurate luminance predictive simulation techniques are needed. Since luminance distributions are influenced more by directional reflection characteristics than by illuminance distributions, it is necessary to obtain data of directional reflection characteristics for luminance simulations. In this study, in order to easily obtain data of directional reflection characteristics to be incorporated into the simulation, we considered to identify feature quantity of mathematical models of directional reflection characteristics by using information obtained by employing simplified measurements. As the simplified measurements method, we attempted to utilize the physical properties of building materials which have recently been made easily measurable by using commercially available instruments. From the attempts in this study, the followings were found. (1) We compared detailed data set of directional reflection characteristics, which were obtained by the direct measurement method utilizing polarizers, with such physical properties as glossiness and surface roughness Ra measured by using commercial measuring instruments. From these, it was found that the larger the glossiness and the smaller the surface roughness Ra, the larger the boundary reflection component tended to be and the sharper the distribution characteristics of the boundary reflection component tended to be. However, other than the correlation between the glossiness and the intensities of the boundary reflection component were low. (2) We compared the detailed data set of directional reflection characteristics with spectral diffuse reflectance measured with commercially available instruments. It was found that there was a strong correlation between the layer reflectance RD and the diffuse reflectance under the light source used for the measurement, which were calculated from spectral diffuse reflectance (SCE). (3) We proposed a method to model directional reflection characteristics based on simplified measurements without polarizers, which gives the estimation of layer reflection characteristics derived from the diffuse reflectance. In this method, the number of measurement steps was capable of being reduced to one-fifth, and the same accuracy as detailed measurements with polarizers was able to be obtained. The method was verified for surfaces with semi-uniform diffuse reflection characteristics and not verified for surfaces with specular reflection characteristics. (4) The directional reflection characteristics of the five building materials with different finishes, such as a polished marble tile, highly polished marble tile, a fair-faced concrete block, a semi-gloss galvanized steel plate and float glass, were successfully obtained by the simplified prediction method. (5) For building materials with high glossiness, it is considered necessary to measure them by setting the measurement incident angle conditions at least three times in order to determine with sufficient accuracy the coefficient K which is the feature quantity of the layer reflection component.

著者

原田 昌幸

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.82, no.734, pp.309-315, 2017 (Released:2017-04-30)

参考文献数

7

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Currently, a restaurant or a cafeteria is often used not only as a place to have a meal but also as a place to work, take a rest, or just kill time. This change has become significantly enhanced by the development and wider availability of wireless networking services that facilitate all types of internet interaction from recreational use to work from just about any place. At many self-service restaurants, customers can not only select their own seats but also move one or more tables together to create more space for themselves. However, when customers are allowed this freedom, it is not uncommon that other customers are inconvenienced because a single customer has taken up many seats, especially during peak operating hours. The objectives of this study are to identify and clarify the characteristics of seat use and over-use behaviors based on customer behaviors in the food court of a shopping mall. The observation target for this research was a food court in a large shopping center in Nagoya, Japan where customers are free to choose their seats and connect tables as they like. Activities besides eating and drinking, such as studying are also tacitly permitted by the establishment. The observation time was from 10:00 a.m. to 2:00 p.m. and included both crowded and relatively empty time periods. The observation survey was conducted on 13 weekdays and 10 weekends, and more than 600 groups and more than 1, 400 customers were observed. The observed items included customer age categories and gender (estimated by the observer), the number of group members, arrival and departure times, tables and seating choices, and the activities in which they engaged. After observation, it was found that the customers ranged widely in terms of age, from young children (even less than 10-year olds) to senior citizens, with a large number of teenage customers too. There were many single customers on weekdays, whereas on weekends nearly all customers were in groups. The seats chosen most often on weekdays were the bench seats with the atrium to its back, with a slight difference in choosing bench or chair seating on the weekends. Also, looking at how customers tended to choose seats, they regarded the distance or nearness to other customers, which indicated that interpersonal distance had an effect on seat selection in this study. Regarding extra seat usage, during the week people in age groups from teenagers to 40-year olds used seats for longer than necessary, with a shift on the weekends to teenagers and people in their 20s, especially teenagers. People who were engaged in chatting were the predominant long-users, with people studying on weekends spending inordinate amounts of time taking up space in the food court observation area during the hours of the study. Taking up extra seats was observed much more on weekdays compared to weekends, and decreased significantly on crowded weekends. During the week men more than women took up more extra seats, which likely reflects a cultural norm regarding personal space. However, on both weekdays and weekends, single people and people 70 years old or older tended to take up extra seats for themselves. Interestingly, during the week, resting and reading seemed to require the most seat overuse, but studying took over the number one slot on weekends, followed by resting and reading. Again, the need for more interpersonal distance might be important to being comfortable resting and reading in such a public place.

著者

海野 賢 三宅 絵美香 田辺 新一

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.80, no.716, pp.917-923, 2015 (Released:2015-11-11)

参考文献数

27

被引用文献数

4 3

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Different kinds of adaptive opportunities are selected in bedrooms, such as air conditioning and natural ventilation; however, the thermal environment created by these measures is not necessarily good for sleep. In this research, a field survey was carried out to investigate the effect of the total thermal environment and its variation on sleep. First, we investigated the effect of airflow and found that an increase in air turbulence causes an increase in the duration of wakefulness. Next, we adjusted the comfort equation for sleep and calculated the thermal load on the body and its variation. We found that both negative and positive increase in the heat load on the body causes an increase in the probability of awakening. An increase in its variation also resulted in an increase in the probability of awakening. We concluded that when planning a pleasant thermal environment for sleep, it is important to consider the total thermal environment and to take into account the effect of its variation as potential cause of sleep disruption.

著者

林 侑江 伊香賀 俊治 安藤 真太朗 星 旦二

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.83, no.745, pp.225-233, 2018 (Released:2018-03-30)

参考文献数

22

被引用文献数

1 3

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The Japanese population is ageing, and currently has the world's highest proportion of elderly people. As one consequence, the number of residents in nursing homes is increasing. The Ministry of Health, Labour and Welfare of Japan has identified preventing a need for care as an important aim. The ministry defines “care prevention” in two parts: preventing a care-requiring condition from arising and, when a care-requiring condition already exists, aiming to improve while preventing deterioration. However, mean care level in nursing homes is still increasing, and existing care-prevention strategies are not enough to prevent future increase. A field survey was conducted to clarify the effect of indoor thermal environment on the care-requiring condition of residents in nursing homes. Twenty private residential-nursing homes, located in the Osaka, Kyoto, Nara and Hyogo prefectures of Japan, were included in this study. Room temperature and relative humidity were measured over approximately 4 weeks in private rooms, the dining room and other rooms of each facility at 20-min intervals in winter 2015. Additionally, questionnaire surveys were conducted twice, in winter 2015 and winter 2016. In the questionnaire, care level and date of certification of care needs was investigated for all care certifications in effect after occupancy until the time of the survey. Most facilities had a relatively warm but dry indoor environment. Fifteen facilities were classified into two groups (warm and cold) based on measured room temperature and two groups (moist and dry) based on measured relative humidity. The Kaplan-Meier method was used to analyse the speed of deterioration (i.e., intensification) of required care level. Residents in the dry facility deteriorated with respect to care level more quickly than residents in the moist facility. In contrast, there was no significant difference according to room temperature. Many factors influence care requirements, including not only the indoor thermal environment but also individual attributes, injury and diseases. To assess these influences, multivariate analysis was carried out. Cox proportional hazards regression analysis was used for multivariate analysis to assess the effect of indoor thermal environment on the care-requiring condition of residents in nursing homes. Two questions were evaluated: “Did the care level deteriorate?” and “If so, how long did it take for care level to deteriorate?” The analysis result showed the cold group and the dry group having a higher risk of deterioration of care level. Furthermore, residents in facilities that were both warm and moist had the lowest risk. This result suggests that both temperature and humidity are important for care prevention. The study results are expected to contribute to improvement in indoor thermal environments and to care-prevention among residents of nursing homes.

著者

橘高 康介 宮崎 ひろ志

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.79, no.704, pp.891-899, 2014-10-30 (Released:2014-10-30)

参考文献数

14

被引用文献数

5 6

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The goal of this research is to obtain knowledge about an impact of the Great East Japan Earthquake on the wide area air temperature sensitivity of electric power consumption. To find a relevant air temperature, we propose a weighted mean air temperature, which obtained with daytime and nighttime population. As the result, we recognized as follows: Energy saving movement in society was clearly recognized after the earthquake (energy consumption reduced to 60% in the sensitivity). From the result in summer 2012, impact of human factor on air temperature sensitivities was recognized continuously.

著者

金子 隆昌 村上 周三 伊藤 一秀 深尾 仁

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.71, no.606, pp.43-50, 2006-08-30 (Released:2017-02-17)

参考文献数

27

被引用文献数

8 11

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This paper (Part 1) gives an outline of the series of this productivity research and presents on the results of field intervention experiment. Here, we focused our attention on the effects of air change rate and studied thermal / air environmental effects on academic performance. The field intervention experiment was conducted in actual classroom with actual students, during normal lessons. It also involves quiz that are a part of a teaching curriculum. When air change rate is increased from 2.6 to 18.6m^3/h per person, academic performance evaluated by quiz score is improved significantly by 5.8% on average (p<0.0007). Similar trends were observed for self-estimated performance. Correlation analyses show that lower air change rates link to reduced academic performance. This experiment indicates that improving indoor environment conditions in classroom can substantially improve academic performance.

著者

石川 大地 福田 知弘 矢吹 信喜

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.85, no.778, pp.1017-1026, 2020 (Released:2020-12-30)

参考文献数

30

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In the architectural field, making a consensus is indispensable to stakeholders. Remote meetings are useful with consensus buildings because they don't require travel costs, unlike face-to-face meetings by gathering from a distance. However, conventional remote meetings like video conferences using displays lack a sense of presence. Moreover, it is difficult to intuitively share three-dimensional (3D) information such as the spatial position and shape of design objects required in the architectural field. For sharing 3D information, 3D physical building models or 3D virtual models are created. In remote meetings, users can see 3D virtual models made by 3D modeling software such as 3D computer-aided design (CAD) or Building Information Modeling (BIM) in stereoscopic images. However, their 3D virtual models have to be made in advance, this is why they cannot represent shapes changing in real-time like 3D physical objects. Point clouds are clusters of points that generally have their position as an XYZ coordinate with RGB values. They can represent 3D surfaces in the real world. By using an RGB-D camera that can capture RGB images and depth data and capture point cloud data in real-time, the 3D virtual model based on the surface of the 3D physical object can be made without needing to create a 3D model in advance. Interactivity enables users to provide understandings of the targeted 3D object characteristics. High-speed point cloud segmentation is necessary to classify unordered point cloud data captured by an RGB-D camera in real-time. In this research, we use the Euclidean Cluster Extraction method for interactive remote sharing of 3D physical objects and provide users with the ability to manipulate 3D point cloud objects with Mixed Reality (MR). We constructed a prototype system using an RGB-D camera to capture point cloud data and MR-Head Mounted Display (HMD). By using the Euclidean Cluster Extraction method with Random sample consensus (RANSAC), point cloud data is classified into individual clusters and then it enables an MR-HMD user in a remote area to see and manipulate 3D point cloud objects manipulating them by a hand gesture, called the “pinch gesture”. Through experiments, we evaluated the accuracy of the high-speed segmentation results and the user’s operability for point cloud objects including visibility. When two objects are on the desk, the relation between the two objects and the RGB-D camera including its angle is tracked. Also, the number of point clouds transferred into the MR-HMD can affect the user’s operability. In future works, the proposed system should be modified using a higher accuracy segmentation method which doesn’t depend on the distance, for capturing point cloud data using multiple RGB-D cameras and align them to make the wider surface of point cloud objects, and for use on Wide Area Network (WAN) as well as the internet environment.

著者

鈴木 宏彬 斉藤 雅也 吉野 博

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.76, no.662, pp.369-376, 2011-04-30 (Released:2011-07-29)

参考文献数

31

被引用文献数

2 2

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A field survey on the living room temperature in terms of residential building types, heating space and operation throughout Hokkaido has been done in 2008 winter. The 879 residential buildings responded to the questionnaire on the types of their building, heating equipments, heating space, operations and clothing style. In addition, they measured their living room air temperature for seven days by liquid crystal thermometer card. Followings are results; 1) Average room air temperature throughout Hokkaido is 20.9 °C . 2) Central heating systems are installed in 30% of all. In the other houses only the living room was heated with convectors. The room air temperature of the central heating and living room heating is 21.6 °C and 20.8 °C , respectively. 3) For heating operation, ratio of houses with all-day heating is about 30% and that with intermittent heating is about 70%. The room air temperature of two groups is 21.5 °C and 20.7 °C , respectively. 4) The room air temperature with the convection heating systems is 1 °C lower than that with the radiation heating systems. 5) The mean occupant's clothing value in their living room is 0.6 clo for male and 1.0 clo for female. 6) According to the multi-variate analysis, it is found that the factors such as age and family size affect the living room air temperature.

著者

藤川 光利 吉野 博 高木 理恵 奥山 博康 林 基哉 菅原 正則

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.75, no.652, pp.499-508, 2010-06-30 (Released:2010-08-26)

参考文献数

19

被引用文献数

4 5

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The aim of this study is to develop the measurement method of multi-zonal airflow rates via human expiration (CO2). The adopted method measures multi-zonal airflow rates based on system identification theory. Also, it is a simple and cost effective method that is suitable to apply in domestic places. In addition, the method will only have minimal interference in the daily life of the residents concerned. As a step toward the practical use of this measurement method, several experimental studies were carried out in a full-scale test house and an existing house in order to investigate the accuracy.

著者

開原 典子 高田 暁 松下 敬幸

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.79, no.697, pp.233-239, 2014-03-30 (Released:2014-07-10)

参考文献数

20

被引用文献数

1

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Based on the measurement of the moisture content in the stratum corneum, the transient model of the moisture transfer in skin was proposed with using the simultaneous heat and moisture transfer equations for hygroscopic range. For the modeling, the simultaneous heat and moisture transfer equation for the hygroscopic range was adapted for the stratum corneum with the thickness of 30μm, considering the contact with the ambient air, and the skin moisture content at the depth of 30μm given as saturated. As the results, the distribution of moisture content calculated by using the proposed analytical model agreed with the measured results, by taking into account the dependence of the moisture conductivity on the moisture content. It was suggested that the proposed model could explain the transient response of skin surface moisture distribution to the change in indoor humidity.

著者

小澤 諭 中山 哲士 鎌田 元康 市川 憲良

出版者

日本建築学会

雑誌

日本建築学会環境系論文集 (ISSN:13480685)

巻号頁・発行日

vol.75, no.658, pp.1027-1032, 2010-12-30 (Released:2011-03-02)

参考文献数

18

被引用文献数

2

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This paper describes the calculation results of the potential quantity of available water resources in each prefecture. At present, there is only the data of the potential quantity of available water resources which is divided into 14 areas in Japan. It is inadequate discussion about the water resources with a viewpoint from prefecture level, so the authors adopt new calculation method. The authors focus on the regional characteristics of potential quantity of available water resources from stochastic method analysis, coefficient of variation and rate of water resources use. Kagawa, Osaka and Saitama have small amount of the potential quantity of available water resources, large coefficient of variation and high rate of water resources use. So the authors estimate that the possibility of water shortage is high in these prefectures.