In this study, we focus on some Preservation Districts for Groups of Historic Buildings, to understand what kind of features people recognized as identities when they look at the streetscape photos of one particular district, which is defined as "Visual Identity". Two classification experiments were conducted to clarify them. According to the result of Experiment-1, there are various types of streetscape photos that vary from district to district. According to the result of Experiment-2, Visual identities were inferred from the results of the analysis of the features pointed out more frequently when differentiating one district from another.
This paper investigated the effect of flanking transmission in the CLT building by using small cross- and T-junction test specimens from two aspects:
1. The measurement of the vibration level reduction through the junctions are considered using small test specimens. The is an index that allows the calculation of the coupling loss factor for SEA based prediction models (i.e., ISO 12354-2:2017, impedance model and Transient SEA) and can be used to quantify the vibration transmissivity.
2. The theoretical estimation of for Rigid T- and cross-junctions made by CLT panels were investigated.
Walking vibration can cause complaints to building users, especially on timber floor. In previous studies, there is a difference in the human evaluation for the same vibration between the sensory test result using the shaking table and the sensory test result using the timber full-scale test floor. In this study, the factor of this difference was investigated, and it was revealed that the deflection due to the landing of the foot influences to the evaluation of the lower rigidity timber floor. Finally, adding the deflection effect, the correction method for the previous evaluation method of walking vibration was presented.
Necessary brightness by distance from the target for general office work was analyzed based on experiment results using head mounted display visual-reality-system that enables to show equal luminous chromaticity values as real environment omni-directionally. As for office works, we chose two tasks, i.e., writing-reading and PC monitor task. 15 participants were asked to evaluate 120 office scenes for writing-reading and 180 for PC monitor task from the viewpoints of (1) Work efficiency, (2) Appropriateness of ambience as office and (3) Possibility to continue to work 3 days in case of emergencies. We found the quantitative conditions related to visual environment.
The purpose of this study is to identify the combined effects of illuminance, correlated colour temperature and chromaticity shift from the Planckian locus duv on the perception of the tinted colour of illumination and the spatial brightness. All 60 conditions with 3 levels of the floor illuminance, 4 conditions of the correlated colour temperature and 5 levels of duv were experimented. It was identified that the effects of the duv shift on tinted colour of illumination were different depending on the correlated colour temperature. It was identified that spatial brightness was significantly lower in the case with the positive duv.
Recently, several studies were conducted on spatial brightness for the perception of spatial brightness; however, in design, “the amount of spatial brightness required” is more important. In this study, five types of activities in a house were set, and the spatial brightness that felt “just good brightness” was investigated for each color temperature and interior reflectance. The spatial average luminance, which is considered to be just right, tends to decrease as the color temperature and interior reflectance increase.
In this paper, the procedure to evaluate the thermal resistance of insulation foam with complex shape on the safe side by measuring with the calibrated hot box method (JIS A 1420 Annex B) is discussed. CFD simulation was conducted under measurement situation of hot box method for flat insulation foams and complicated shape ones. The analysis results, such as thermal resistance of surface heat transfer and overall heat transmission, show good agreement with experimental results. CFD simulation is considered to be an effective method for evaluating heat insulation performance.
Although it is said that moisture condensation at the vapor retarder doesn’t occur in wall assembles with vented cavity, our previous study reported that rain penetration and water absorption of exterior system affects the condensation. This research is focused on unraveling of mechanism of the internal condensation caused by driving rain experimentally. Drying and drainage performances of the vented cavity were confirmed in the lab-experiments using mock-up wall specimens. In the field measurement, the impact of driving rain on the internal condensation was demonstrated through intermittent injected rainwater, and the drying and drainage performances of different configurations were compared.
The purpose of this study is to investigate the effect of supply air return from the HVAC system on indoor air quality. We discuss the structure of the formation mechanism in local pollutant concentration distributions using various indices on the ventilation efficiency of a local domain in 3 rooms with different layout of the exhaust outlet location. As a result, when the percentage of the return air at the supply inlet becomes large, visitation frequency of pollutants on a target local domain increases exponentially, and then the averaged concentration of the pollutants of the local domain also increases exponentially.
This study analyzed the energy efficiency and specifications of commercial buildings newly constructed or renovated in the year 2018 by using the data inputted to the Model Building Method Input Assistant Tool operated under the 2016 Building Energy Efficiency Standard. Logistic regression models were constructed to quantify the probability distribution of BEI, the energy performance indicator based on primary energy consumption, and specifications related to building insulation and efficiencies of facilities installed for energy end-uses. The result revealed that building size and location significantly alter the distribution of these items.
Many studies have been conducted using meso-scale numerical weather prediction models to analyze the thermal and wind environments of urban areas all over the world. However, weather predictions are highly sensitive to initial conditions. It’s so called the “butterfly effect”. In this study, the effects of the initial and boundary conditions on the accuracy of reproducing the wind environment, especially for the sea breeze, over Fukuoka metropolitan area were investigated by changing the objective analysis data used for the initial and boundary conditions and the length of the spin-up calculation period.
A field survey using actual indoor temperature measurements and questionnaires was conducted in Yusuhara, Kochi Prefecture, in November 2019. Based on the field survey, ordinal logistic regression analysis was conducted to identify common characteristics of residents living in a cold environment at waking and before bedtime. Low insulation performance, the type of heating equipment used such as electric heater and air conditioners, and personal attributes such as age, number of people in the household and length of time at home were significant risk factors for living in cold houses.
In order to select an appropriate turf for stadiums, it is important to compare the shade tolerance of Tifway (Cynodon dactylon [L.] Pers. × C. transvaalensis Burtt-Davy), Celebration (C. dactylon), and TifGrand (C. dactylon × C. transvaalensis). We conducted growth experiments on three varieties of turf to evaluate their varietal characteristics.
Celebration and TifGrand showed less of a loss of visual evaluation under low light conditions in the short-term than Tifway. However, both Celebration and TifGrand tended to reduce the number of upright stems and the leaf blade width. Consequently, in the long-term, there may be impacts on visual evaluation.