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Osaka, Japan

Daiwa House Industry Co., Ltd. is Japan's largest homebuilder, specializing in prefabricated houses. The company also is engaged in the construction of factories, shopping centers, health care facilities, the management and operation of resort hotels, golf courses and fitness clubs. Daiwa House also operates as a sales agency for HAL robot suits.The company was founded in 1955 in Osaka and is listed on the Tokyo Stock Exchange and Osaka Securities Exchange, being a constituent of the TOPIX and Nikkei 225 stock indices. Wikipedia.

Kataoka H.,Nara Medical University | Tanaka N.,Daiwa House Industry Co. | Saeki K.,Nara Medical University | Kiriyama T.,Nara Medical University | Ueno S.,Nara Medical University
European Neurology | Year: 2014

Background: Recently, we evaluated factors responsible for falling, including walking speed evaluated with the use of originally designed, suddenly narrowed paths, in patients with Hoehn-Yahr stage III PD. We prospectively studied the same cohort of patients with PD who were followed up for 2 years, to determine predictors of future falls. Methods: We performed clinical assessments and evaluated balance in 26 patients. A total of 19 variables including PD-related independent variables, balance investigation-related independent variables and gait independent-related variables were evaluated. Results: The Frontal Assessment Battery (FAB) score (p = 0.002), Tinetti balance (p = 0.009), and gait velocity (p = 0.001) were higher in fallers than in non-fallers. On multiple logistic regression analysis, the FAB score was related to falling (odds ratio = 3.328, p = 0.033, 95% confidence interval = 1.104-10.03). On the FAB, the scores of 'inhibitory control' and 'sensitivity to interference' were significantly lower in fallers than in non-fallers. Conclusions: The use of the originally designed, suddenly narrowed path was the primary reason for demonstrating for the first time that a low FAB score is a risk factor for future falls. Calculation of the FAB score may be useful for predicting the risk of future falls. © 2014 S. Karger AG, Basel. Source

Nakazawa T.,Fujita Corporation | Masuda K.,Fujita Corporation | Kondoh T.,Daiwa House Industry Co.
IABSE Conference, Nara 2015: Elegance in Structures - Report | Year: 2015

Ill this paper we describe a new system floor vibration analysis using a finite element method which makes it easy for users to input data and visualize results. This system is linear elastic vibration analysis software called "Yurayzer3'\ It comprises a pre-processor unit, a calculation unit and a post-processor unit. The chief innovation of this system is the in-house development of a pre-processor and post-processor that simplifies the numerical inputs of information about nodes and elements. In order to verify the analytical accuracy of this system, the eigenvalue analysis is carried out and compared with measured values. This comparison showed a coefficient of variation about 10%, which is a level of agreement sufficient for the structural design phase. Source

Pei X.,Tongji University | Shou Q.,Tongji University | Su S.,Tongji University | Liu K.,Daiwa House Industry Co.
Applied Mechanics and Materials | Year: 2013

Exergy analysis has been widely applied in parallel with energy analysis in order to find the most rational use of energy. Low exergy systems are defined as heating or cooling systems that allow the use of low valued energy, which is mostly delivered by solar energy (i.e., solar collectors, hybrid PV/T panel) as the energy source. Low exergy building systems create more flexibility and generate new possibilities for the design of sustainable buildings. Usage of solar energy in different kinds of systems provides scope for several studies on exergy analysis. The present study comprehensively reviews the studies conducted on the exergy analysis of various solar energy systems for establishing the sustainable buildings. Conclusions regarding the usability of the exergy method as a tool to promote a more efficient use of solar energy sources are derived, with the aim to highlight future research issues and promote further developments of this method. © (2013) Trans Tech Publications, Switzerland. Source

Nagao K.,Daiwa House Industry Co. | Kanda J.,Nihon University
Earthquake Spectra | Year: 2015

The damping correction factors (DCFs) to convert the 5% damping acceleration response spectra to those for other damping levels are computed for the records of 13 Japanese earthquakes. Their correlation with the standard deviation of phase difference (σ) is also investigated in ten frequency bands. The σ-DCF relations obtained are found to be very similar across the different types of earthquakes. Further, regression analysis suggests that for damping ratios of 1% and 2%, with the increase in σ, the DCFs increase in low-frequency bands (up to 4-5 Hz), whereas they decrease in higher frequency bands. On the other hand, for damping ratios of more than 5%, with the increase in σ, the DCFs decrease in low-frequency bands (up to 1 Hz), whereas the opposite tendency is observed in higher frequency ranges. This research also discusses the applicability of the σ-DCF relations to design ground motion simulation. © 2015, Earthquake Engineering Research Institute. Source

Shimizu T.,Daiwa House Industry Co. | Koizumi S.,Kuraray Kuraflex Co.
Building and Environment | Year: 2015

Gaps, slits, and openings for natural ventilation that occur around doors and windows cause sound leakage and decrease sound insulation performance. However, if airtight materials are used to close these gaps, as is typical, the ventilation performance is lost. In the gaps, the particle velocities become large, and this phenomenon is reported as the "gap effect." Furthermore, it is suggested that the sound insulation performance is improved by suppressing the particle velocities in the gaps with breathable sound-absorbing materials. Therefore, a balance between the suppression of sound leakage and maintaining the air ventilation is obtainable by considering the balance between the total equivalent clearance and the flow resistivities of the breathable sound-absorbing materials. In this study, for the installation of thin nonwoven fabrics as a breathable material in the gaps, improvements in the sound insulation performance and the amount of ventilation as the total equivalent clearance area are verified. Additionally, the relations between the sound insulation performance and the air ventilation performance using these nonwoven fabrics in the gaps are discussed. As a result, an improvement in the sound insulation performance is obtained while maintaining the air ventilation performance by installing thin nonwoven fabrics that have low flow resistivities because the large particle velocities are effectively suppressed in the gaps. © 2015 Elsevier Ltd. Source

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