Furuta T.,Daiichi Institute of Technology |
Nakao M.,Yokohama National University |
Makita T.,KANESHIN Co.
WCTE 2016 - World Conference on Timber Engineering | Year: 2016
To improve ductility and damping performance of braced wall in Post and Beam construction wooden house, a new brace fastener which fastens the end of a diagonal wood brace to the end of column was developed. The new faster is able to absorb relative displacement between the end of a brace and a wood frame. Moreover, due to the effect of plastic deformation of steel "bridge" and shear deformation of high damping rubber, stiffness and damping force are added to the fastener. In this paper, static shear loading test of a wood frame with a wood brace which is fastened by the new brace fasteners, incremental analysis and earthquake response analysis of two-storied wooden houses with the new brace fasters are presented. It was found that the new brace faster reduces story drift of wooden houses to less than 50% under large earthquake motion compared to conventional fastener.
Uchimura S.,Daiichi Institute of Technology |
Muraoka T.,Daiichi Institute of Technology
2016 IEEE 5th Global Conference on Consumer Electronics, GCCE 2016 | Year: 2016
If TFT-LCDs are used in controllers, each with a picture monitor, are operated together with PCs under the direct sunbeam, or if smartphones and car navigators are mostly used under sunshine in a daily life, such displays would be strongly requested at brighter illuminance in outdoor-use under the strong sunbeam. We newly apply to the direct drive assembly of backlight to lighting for the rear of TFT-LCD by use of the high-intensity daylight-colored organic LED plate. Since the daylight-colored organic LED module is made of organic LED plate of two-dimensional lighting beam in rectangular shape. Its lighting strength is easily controllable with software, in three steps, low (indoor-use), medium (cloudy, outdoor-use), and high (sunshiny, under shadow of evergreen trees, outdoor-use), so as to be harmless to the human eyes. © 2016 IEEE.
Ueno H.,Daiichi Institute of Technology
IEEE Region 10 Annual International Conference, Proceedings/TENCON | Year: 2017
Proposed monitoring systems do not need to put sensors on the human body to recognize normal or abnormal status in senior citizens. Conventional wear-free monitoring systems use live cameras or home electrical appliances, but they have problems of privacy or habit dependencies. Also, wearable monitoring systems have problems of inconvenience for a user's life style. Our final objective is to provide a monitoring system using sheet-type piezoelectric sensors, which can sense even if the wearer is lying or sitting on the floor, bed or chair. The sensor data will be sent into care management cloud systems, and if those sensors find abnormalities in the status of care recipients, notification email will be sent to care givers. This research shows an implementation of the trial system program that has primary functions. It receives signals from a piezoelectric sensor and extracts cardiac cycle and respiration cycle signals using particular digital filtering steps. © 2016 IEEE.
Oe K.,Daiichi Institute of Technology |
Mizoguchi M.,Daiichi Institute of Technology
2016 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2016 | Year: 2016
We aimed to develop some welfare devices for phonation disorder patients. One of them is the electrical control type speaking valve system. The conventional speaking valve have the one-way valve mechanism, they open when the user breaths in, and close when user breaths out and produce the voice. This type is very simple and tough, but some users feel closeness in case of exhalation. This problem is caused by its mechanism that can't be controlled by user's will. Therefore, we proposed an electrical control-type speaking valve system. This valve is opening and closing controlled by the myoelectric signal of user's sternohyoid muscle. In our previous report, it was clarified that this controllable valve had better performance from the viewpoint of easy breathing than the conventional valve. Furthermore, we proposed the compact myoelectric control-type speaking valve system. This compact valve was enough small to attach the user's body, and its opening area was larger than conventional type. However, some vortex flow was seen inside of this valve from the FEM analysis of this valve. Then, we tried to extinguish the vortex flow by the baffle plates. In this report, the result of FEM analysis about the effectiveness of the various shape baffle plate. From the result of the analysis, it was clarified that the asymmetric type baffle plate had better characteristic than the symmetric type. © 2016 IEEE.
Muraoka T.,Daiichi Institute of Technology |
Uchimura S.,Daiichi Institute of Technology |
Ikeda H.,IKEDA Technology
Journal of Display Technology | Year: 2016
Visual fatigue is caused by display operations on a PC for a long time in a day, which might be serious if it exceeds the circadian limit. To avoid this kind of events, any action to check them by oneself needs to be done if these continue for multiple hours. This paper employs a simple method to check for visual fatigue with declines in visual accommodation during the display operations on the PC as indexes. Testing the fatigue of human eyes was sensed by using Landolt rings displayed on a smartphone newly used as a tiny high precision display. The daily check will help the display operators on the PC to keep visual health, avoiding them from the fatigue exceeding the circadian change limit. The visual distance was successfully set at 0.5 m on a smartphone for checking declines in visual accommodation. © 2016 IEEE.
Takahashi M.,Yamanashi University |
Nanba R.,Daiichi Institute of Technology
Proceedings of the SICE Annual Conference | Year: 2014
This paper proposes a method of Fault Tree Analysis (FTA) for control program. If malfunction of control program occurs, industrial product into which program is installed may behave inadequately. As a result, it causes some faults for industrial products, but it also causes damages to the users and environments. This paper proposes following method; prepare FT templates corresponding to the program structure, extract characteristics of control program, and develop FT according to the predefined rules. As a result, we can develop FT mechanically. The proposed FTA method is applied to an analysis of 'spin too fast' fault for satellite, and FT is developed. The result of FT is adequate. This result shows that safety of control program installed into industrial products are improved by applying the proposed FTA method for control program. © 2014 SICE.
Ooe K.,Daiichi Institute of Technology
Procedia Engineering | Year: 2012
We developed a novel artificial larynx with on/off and pitch control for Speech Production Substitutes (SPSs) users, particulary an electrolarynx control based on the myoelectric signal of the laryngeal muscles located near the body surface (such as the sternohyoideus). For patients who have lost their vocal cords or its function for vocalization, various SPSs have been developed and widely used. However, these substitutes have the limitation -that they cannot match with the vocalization of healthy human larynx. The measurement of the surface myoelectric potential was performed and we studied its efficiency for voice on/off and pitch frequency control. The results show that there is a quadratic relation between the measured myoelectric potential and the pitch frequency. Using this relation, it was possible to control the pitch frequency of the generated sound in three levels with 86.7% of accuracy (condition of linear relationship lead 68.9%). This confirms that the surface myoelectric potential was a suitable control signal for the artificial larynx. In this paper, the capability of novel controllable artificial larynx controlled by myoelectric signal of sternohyoideus was described. © 2012 The Authors. Published by Elsevier Ltd.
Linlin Z.,Jinan Vocational College |
Tanaka K.,Daiichi Institute of Technology
Advanced Materials Letters | Year: 2014
This study investigated the dissolution kinetics of silver nanoparticles in presence of natural organic matter. Silver nanoparticles were synthesized using chemical reduction method. Particle size and surface charges of the synthesized silver nanoparticles were characterized using a zetasizer. ICP-MS combined with ultrafiltration technology was used to quantify the silver nanoparticle dissolution in presence of natural organic matters. The obtained results suggested that the dissolution rate of silver nanoparticles decreases with increasing natural organic matter content. Our study provides important guidance in elucidating the transport and fate of silver nanoparticles in natural water conditions. © 2014 VBRI press.
Muraoka T.,Daiichi Institute of Technology |
Ikeda H.,Consultant Machida
2015 IEEE 4th Global Conference on Consumer Electronics, GCCE 2015 | Year: 2015
Estimation of whether visual fatigue caused by display operations on personal computers will be tolerable is very important to keep one's eyes healthy. Newly described are the mathematical model analyses of temperature rises on the eyelids of each operator and interpretations allied to this matter. Note that the temperature rises of this mode were optically sensed to have been caused by visual fatigue due to visual accommodation change during display operations on personal computers. © 2015 IEEE.
Nakamura Y.,Kagoshima University |
Kawagoishi N.,Daiichi Institute of Technology |
Kariya K.,Kagoshima University
Advanced Materials Research | Year: 2014
In the present study, the tensile and fatigue properties of extruded 7075 Al alloys subjected to re-solution treatment and then T6, T73 and retrogression-reaging (RRA) tempers were reassessed based upon the microstructural analyses by means of electron backscattering diffraction (EBSD) and X-ray diffraction (XRD). The microstructural analyses indicated that fibrous grains having orientations close to <111> and <001> were preferentially aligned in the extrusion direction and that re-solution treatment increased the fraction of <111> grains. Further the as-received T6 specimens had very high dislocation density as well as fine subgrains, while the re-solution treatment decreased dislocation density considerably and increased grain size. These characteristics explained tensile properties well, by taking into account the effect of precipitates formed by tempers. On the other hand, fatigue strength decreased prominently in all of the specimens, as the relative humidity (RH) was increased from 25% to 85%. T73 and RRA treatments which improve the resistance to stress corrosion cracking (SCC) in static loading were not effective in the humidity-enhanced deterioration in fatigue strength. © (2014) Trans Tech Publications, Switzerland.