Kenta Fukagawa
Kyushu Sangyo University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Kenta Fukagawa.
Journal of Environmental and Public Health | 2013
Yoshihito Kurazumi; Emi Kondo; Jin Ishii; Tomonori Sakoi; Kenta Fukagawa; Zhecho Dimitrov Bolashikov; Tadahiro Tsuchikawa; Naoki Matsubara; Tetsumi Horikoshi
In order to manage the outdoor thermal environment with regard to human health and the environmental impact of waste heat, quantitative evaluations are indispensable. It is necessary to use a thermal environment evaluation index. The purpose of this paper is to clarify the relationship between the psychological thermal responses of the human body and winter outdoor thermal environment variables. Subjective experiments were conducted in the winter outdoor environment. Environmental factors and human psychological responses were measured. The relationship between the psychological thermal responses of the human body and the outdoor thermal environment index ETFe (enhanced conduction-corrected modified effective temperature) in winter was shown. The variables which influence the thermal sensation vote of the human body are air temperature, long-wave thermal radiation and short-wave solar radiation. The variables that influence the thermal comfort vote of the human body are air temperature, humidity, short-wave solar radiation, long-wave thermal radiation, and heat conduction. Short-wave solar radiation, and heat conduction are among the winter outdoor thermal environment variables that affect psychological responses to heat. The use of thermal environment evaluation indices that comprise short-wave solar radiation and heat conduction in winter outdoor spaces is a valid approach.
Journal of ergonomics | 2014
Yoshihito Kurazumi; Tomonori Sakoi; Tadahiro Tsuchikawa; Kenta Fukagawa; Zhecho Dimitrov Bolashikov; Tetsumi Horikoshi
In the outdoor environment, the effect of the physical environmental factors that compose the sensational and physiological temperature is remarkably large in comparison to the indoor environment. The purpose of this paper is to propose and develop a behavioral thermoregulation model in the outdoor environment, in order to predict the mean skin temperature for the evaluation of outdoor environment. This model is based on a Two-Node Model, and has three components: direct solar radiation, indirect solar radiation, and heat conduction. Each body part consists of core and skin layers. The model formula, by ratio of body weight of skin layer of heat conductance between skin and core layer, was included in this model. To verify this model, experiments were conducted. It was shown from the relation between ETFe (Enhanced conduction-corrected modified effective temperature) and mean skin temperature that it is possible to quantity explicitly the effects owing to outdoor environmental factors, short-wave solar radiation, heat conduction etc. It was made clear that the current model is valid for simulated mean skin temperature in the outdoor environment.
Journal of ergonomics | 2014
Yoshihito Kurazumi; Kenta Fukagawa; Emi Kondo; Tomonori Sakoi
Human thermal sense is not expressed only by simple heat equilibrium. The influence of visual and auditory stimuli causes differences in overall thermal sense arrived at by sophisticated sensory processing by the cerebrum. If it can be clearly shown that a thermal environment considered slightly uncomfortable could be ameliorated using visual stimuli, the cost effectiveness of such an initiative would be highly significant, particularly in terms of air conditioning system running costs. Focusing on the visual stimuli provided by greenery, experiments were conducted in a thermal environment deemed slightly uncomfortable, where the temperature was set at a base point of 28oC. Experiments were conducted in a temperature-controlled room. Thermal environmental conditions were set at three different temperatures: 25oC, 28oC and 31oC. Wall surface temperatures were set to equal these temperatures. Air velocity (calm air currents of 0.2 m/s or less) and relative humidity (60% RH) were set the same throughout. Subjects were asked to sit quietly for the test. The visual stimuli consisted of ten different types of scenery, including that of leafy vegetation. The influence of overall stimuli of the cerebrum on the indoor thermal environmental index ETF was determined to prove the significance of actively placing visual stimuli in spaces. Thermal stimuli influence the human body on mean skin temperatures, while visual stimuli do not affect mean skin temperatures. In ETF deemed fairly uncomfortable, that is at a range of hotter than 28-29oC, clear improvements were observed in thermal sense due to the influence of visual stimuli such as natural elements including vegetation like greenery. Visual stimuli were appropriate at a level of up to 69% greenery, where a dynamic effect on warmer environmental conditions can be felt and where the depth of fuller vegetation cover can be perceived.
IOP Conference Series: Materials Science and Engineering | 2017
Yoshihito Kurazumi; Jin Ishii; Kenta Fukagawa; Emi Kondo; Ariya Aruninta
Thermal sensation affects body temperature regulation. As a starting point for behavioral body temperature regulation taken to improve from a poor thermal environment to a more pleasant environment, thermal sense of thermal environment stimulus is important. The poupose of this sutudy is to use the outdoor thermal environment evaluation index ETFe to quantify effects on thermal sensations of the human body of a tropical region climate with small annual temperature differences, and to examine seasonal differences in thermal sensation. It was found temperature preferences were lower in the winter season than in the dry season, and that a tolerance for higher temperatures in the dry season than in the winter season. It was found effects of seasonal differences of the thermal environment appear in quantitative changes in thermal sensations. It was found that effects of seasonal differences of the thermal environment do not greatly affect quantitative changes in thermal comfort.
Journal of Environmental Engineering (transactions of Aij) | 2008
Kenta Fukagawa; Saburo Murakawa; Daisaku Nishina
� �� � � � � � � � � � � � � � � � � � � � � � � � � ���� ����������������������������� ������������������������������ ������������������������������ �������� ����������������������������� ������������������������������ ������������������������������ ����������������������� ����������������������������� ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ �������������������� ����������������������������� ����������������������������� ������������������������������� ������������������������������ ������������������������������ �������� � ����������������������������� ����������������������������� ����������������������������� ������������������������������ ����������� ����������������������������� ������������������������������ ������������������������������ ����������������������� ����������������������������� ���������������������������� ������������������������������ ������������������������������ ������������������������������ ������ ���������������������������� ������������������������������� �������������������������������� ����������������������������� ������������������������������ ������������������������������ �������������������������������
International Journal of Biometeorology | 2014
Yoshihito Kurazumi; Jin Ishii; Emi Kondo; Kenta Fukagawa; Zhecho Dimitrov Bolashikov; Tomonori Sakoi; Tadahiro Tsuchikawa; Naoki Matsubara; Tetsumi Horikoshi
Journal of human and living environment | 2013
Yoshihito Kurazumi; Tadahiro Tsuchikawa; Yoshiaki Yamato; Tomonori Sakoi; Zhecho Dimitrov Bolashikov; Emi Kondo; Kenta Fukagawa; Kunihito Tobita; Naoki Matsubara; Tetsumi Horikoshi
American Journal of Climate Change | 2016
Yoshihito Kurazumi; Jin Ishii; Kenta Fukagawa; Emi Kondo; Ariya Aruninta
Journal of Environmental Engineering (transactions of Aij) | 2008
Jin Ishii; Yoshihito Kurazumi; Kenta Fukagawa; Shoutaro Hiramatsu
Aij Journal of Technology and Design | 2011
Takuya Ogawa; Saburo Murakawa; Daisaku Nishina; Takahiro Tanaka; Kenta Fukagawa; Ichiro Takahashi