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.

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Saeki K.,Nara Medical University | Obayashi K.,Nara Medical University | Iwamoto J.,Tenri University | Tanaka Y.,Nara Medical University | And 7 more authors.
Journal of Epidemiology and Community Health | Year: 2013

Background: Previous studies have proposed that higher blood pressure (BP) in winter is an important cause of increased mortality from cardiovascular disease during the winter. Some observational and physiological studies have shown that cold exposure increases BP, but evidence from a randomised controlled study assessing the effectiveness of intensive room heating for lowering BP was lacking. Objectives: The present study aimed to determine whether intensive room heating in winter decreases ambulatory BP as compared with weak room heating resulting in a 10°C lower target room temperature when sufficient clothing and bedclothes are available. Methods: We conducted a parallel group, assessor blinded, simple randomised controlled study with 1:1 allocation among 146 healthy participants in Japan from November 2009 to March 2010. Ambulatory BP was measured while the participants stayed in single experimental rooms from 21:00 to 8:00. During the session, participants could adjust the amount of clothing and bedclothes as required. Compared with the weak room heating group (mean temperature±SD: 13.9±3.3°C), systolic morning BP (mean BP 2 h after getting out of bed) of the intensive room heating group (24.2±1.7°C) was significantly lower by 5.8 mm Hg (95% CI 2.4 to 9.3). Sleep-trough morning BP surges (morning BP minus lowest night-time BP) in the intensive room heating group were significantly suppressed to about two thirds of the values in the weak room heating group (14.3 vs 21.9 mm Hg; p<0.01). Conclusions: Intensive room heating decreased morning BP and the morning BP surge in winter.

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.

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.

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.

Nagao K.,Daiwa House Industry Co. | Kanda J.,Nihon University
Journal of Earthquake Engineering | Year: 2014

The causality of natural ground motions is evaluated through statistical values for the phase difference. The causality is expressed in terms of the Hilbert transform relationship between the real and imaginary parts of the Fourier transform of the ground motion. We find that ground motions with a shorter duration have a higher degree of causality. Furthermore, we propose a ground-motion simulation algorithm that incorporates causality. The simulated ground motions, compatible with design response spectra, have almost the same spectrum conversion factors as those estimated from natural ground motions. Copyright © A. S. Elnashai.

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.

Shimizu T.,Daiwa House Industry Co. | Kawai Y.,Kansai University | Takahashi D.,Kyoto University
Applied Acoustics | Year: 2015

Unintended gaps that occur around door sets and windows cause sound leakage and decrease sound insulation performance. In the Boundary Element Method (BEM) analysis, sound transmitted through a gap is expressed as the integral of the particle velocity. This means that the transmitted sound field can be expressed based on the particle velocity at the gap only. Hence, it is demonstrated here through numerical analysis that a decrease in sound insulation performance is caused by an increase in sound particle velocities in the vicinity of gaps in a rigid wall. We call this phenomenon the "gap effect". It is also shown that the movement of particles around the gaps can be suppressed by installing a thin sound-absorbing material such as thin or nonwoven fabric, reducing the sound leakage from the gaps. Furthermore, the sound insulation performance obtained by suppressing the particle velocities at the gaps is experimentally verified. The results of this study show that the improvement observed in the sound insulation performance following the installation of sound-absorbing layers into the gaps is quite significant and is suitable for practical use. © 2015 Elsevier Ltd. All rights reserved.

Daiwa House Industry Co. | Date: 2014-10-21

A system and method are provided to hold a dialogue between communicators while the communicators are viewing their images each other and which prevents the presence of an image display screen from being noticeable in a non-communication state. A first unit for the communicator generates and transmits first data indicating the image of the communicator. A second unit for the communication partner expands the first data received via a communication line to display the image of the communicator on the display screen, and generates and transmits second data indicating the image of the communication partner in front of the display screen. A human sensor is configured to detect that the communication partner is at a predetermined position in a home. Only during the period of the human sensor detecting that the communication partner is at the predetermined position, the display-cum-mirror forms a display screen, and otherwise, a mirror.

Daiwa House Industry Co. | Date: 2013-03-13

The soundproof room (41a) has an interior space (43a) defined by soundproof walls (44a, 45a, 46a, 47a). The soundproof room (41a) includes a sound absorber (11a) whose sound absorbing face absorbs sound in the room and is exposed in the room. The sound absorber (11a) has a varying depth dimension from a front face (19a), serving as the sound absorbing face, toward the depth direction. The sound absorber (11a) is formed by stacking a plurality of layer members from the front face (19a), serving as the sound absorbing face, in the depth direction.

Daiwa House Industry Co. | Date: 2013-10-01

Medical and therapeutic device and apparatus, namely, a force and motion sensing apparatus and assisted exercise machine for the rehabilitation of hands and wrists, feet and ankles and knees affected by neuromuscular diseases, disorders, or injuries for home or clinical use; Walking aids; Movement assistive devices for medical and nursing-care purposes, namely, walking aids. Beauty salons; Hairdressing salons; Providing bath houses; Garden or flower bed care; Garden tree planting; Fertilizer spreading; Weed killing; Vermin exterminating for agriculture, horticulture or forestry; Farming equipment rental; Rental of medical machines and apparatus; Landscape design.

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