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Mochizuki E.,Chiba Institute of Technology | Kimura H.,Haseko Corporation
Journal of Environmental Engineering | Year: 2010

The purpose of this study is to identify the visual effects of the difference of spectral power distribution of luminaires in office space. Subjective experiment was conducted in two experimental chambers with different kind of ceiling luminaires - LEDs and fluorescent lamps. Visual fatigue of the subjects was evaluated by three methods, ART (Accommodation Response Time) and CFF (Critical Fusion of Flicker) as objective test and questionnaires for evaluation of subjective symptoms of fatigue as subjective test. The results showed that there was no significant difference between the variation rate in ART and that in CFF caused by VDT works within one hour under LEDs and those under fluorescent lamps. Also the subjective evaluation on fatigue was not significantly different among different kinds of the light source. Source

The nasty smell in the new constructed 12 dwellings was analyzed by the electronic nose. This analyzer has the technique of odor similarity mapping represented in the radar chart in order to make clear the odor characters. Based on this technique, it is clarified that the perceived air quality among the new constructed houses with the same material and the components specifications for interior finishes is similar to each other. Model experiments may be necessary to elucidate the odor pollution mechanism. As the first step, the odor in a test chamber set in the same floor component, wall component and ceiling component as actual one was confirmed the reproducibility of the perceived air quality in the new constructed houses. Source

Kimura H.,Haseko Corporation | Komine H.,Chiba Institute of Technology | Iizumi G.,Chiba Institute of Technology
Journal of Environmental Engineering (Japan) | Year: 2014

Recently, use of deodorization equipment at garbage place in apartment buildings is increasing. However, its design method is not established due to lack of its test method and test data. Moreover, information on odor at the garbage place is lacking, and its source and ingredient is not clear. This study aims to establish the design method of deodorization equipment at garbage place. Odor at the garbage place is grasped, and the performance of the presentlyused equipment was clarified by devised test method. The result showed that ozone deodorization equipment generally used is adequate to be positioned as complement to ventilation. Source

Miyashita T.,Haseko Corporation | Takizawa A.,Kyoto University | Katoh N.,Kyoto University
Journal of Structural and Construction Engineering | Year: 2011

The authors propose a method to estimate the retention of stretch of polyvinyl chloride resin waterproofing sheet using image analysis techniques. The retention of stretch is regarded as the index of deterioration of a waterproofing sheet. Firstly, we originally developed a microscope for taking digital images of the surface of water proofing sheets that can capture the crack clearly. Then various kinds of existing image attributes are adopted to characterize the crack. These features are used as explanatory variables of multiple linearregressions to estimate the retention of the stretch. Estimation models were created and validated through cross validation tests. Finally, we succeeded in creating the estimation model that exhibits about 0.96 in determination coefficient. Source

Aida Y.,Haseko Corporation | Hashimoto N.,Hachinohe Institute of Technology
AIJ Journal of Technology and Design | Year: 2016

Aiming to establish a floor impact sound prediction method for deck plate slabs in steel structure buildings, a response analysis of floor vibration by the finite element method with coupling of in-plane and bending displacement was verified. First, damping constants of the actual deck plate slabs were measured. Then, using the measured damping constants, a vibration response analysis which modeled the cross-sectional composition of deck plate slabs and steel H-beams was conducted. The analysis of the vibration response to the standard heavy impact source showed good correspondence with the measurement. Source

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