S. P. Chang

High-Performance a-IGZO Thin-Film Transistor Using

In this letter, we report the fabrication of an amorphous indium gallium zinc oxide (a-IGZO) thin-film transistor with a high-k dielectric layer on a glass substrate. The room-temperature-deposited a-IGZO channel with Ta2O5 exhibits the following operating characteristics: a threshold voltage of 0.25 V, a drain-source current on/off ratio of 105, a subthreshold gate voltage swing of 0.61 V/decade, and a high field-effect mobility of 61.5 cm2/V·s; these characteristics make it suitable for use as a switching transistor and in low-power applications.

\hbox{Ta}_{2}\hbox{O}_{5}

This paper aimed to use several triaxial acceleration sensor devices for joint sensing of injured body parts, when an accidental fall occurs. The model transmitted the information fed by the sensors distributed over various body parts to the computer through wireless transmission devices for further analysis and judgment, and employed cognitive adjustment method to adjust the acceleration range of various body parts in different movements. The model can determine the possible occurrence of fall accidents, when the acceleration significantly exceeds the usual acceleration range. In addition, after a fall accident occurs, the impact acceleration and normal (habitual) acceleration can be compared to determine the level of injury. This study also implemented a sensing system for analysis. The area of the body parts that may sustain greater impact force are marked red in this system, so that more information can be provided for medical personnel for more accurate judgment.

Gate Dielectric

We report the fabrication of a lateral ZnO nanowire UV photodetector on a glass substrate using tungsten as the growth barrier to suppress the vertical growth of the ZnO nanowires. Upon UV illumination, the detector current increased by more than 1 order of magnitude. Furthermore, the noise equivalent power and the normalized detectivity D * of the fabricated lateral ZnO nanowire photodetector were 7.89 × 10 -11 W and 1.9 × 10 8 cm Hz 0.5 W -1 , respectively.

Detection of Cognitive Injured Body Region Using Multiple Triaxial Accelerometers for Elderly Falling

With the development of digital home appliances, the vision of a digital home can be realized, and users can control home appliances by remote control through the home network. However, current home networks have a variety of transmission control information media, such as WLAN, Zigbee, ECHONET, and LonWorks, resulting in an issue of interoperability of different network protocols. To solve this problem, this study proposes a OSGi-based service architecture for Cyber-Physical Home Control Systems, which supports service-oriented control methods. Users can control appliances in the physical environment by intuitive operation through a virtual home on the network. When the state or location of any appliance in the physical environment changes, the virtual context can enact timely changes, accordingly.

A Lateral ZnO Nanowire Photodetector Prepared on Glass Substrate

The authors report the growth of -Ga O nanowires by heating the GaN–sapphire template and the fabrication of a -Ga O nanowire photodetector by depositing interdigitated contact electrodes. It was found that the average length and diameter of the -Ga O nanowires were around 10 m and 100 nm, respectively. It was also found that the fabricated photodetector was solar-blind with sharp cutoff at 255 nm. With an incident light wavelength of 255 nm and an applied bias of 10 V, it was found that measured responsivity of the photodetector was A W.

OSGi-based services architecture for Cyber-Physical Home Control Systems

Due to the limited hardware resources of mobile devices, the multimedia streaming processes are energy consuming and the quality of multimedia video playback is suffered under the restricted bandwidth. In recent studies of multimedia streaming, the features of mobile devices were not considered in solving the bandwidth restriction problem. This paper proposes a novel cloud multimedia streaming architecture for providing dynamic adjustable streaming services, we considers mobile device resources, multimedia codec characteristics and the current network environment and design the stream dispatcher with the adaptable codec approach to calculate the most suitable segment for mobile devices in time. Besides, dynamic adjustable multimedia streaming (DAMS) algorithm within mobile multimedia service is also schemed in this paper to deliver multimedia content over cloud network immediately, decrease the loading of content storage servers substantially and reduce power consumption of mobile devices effectively.

A Solar-Blind

When facing damages caused by falls, a well designed smart sensor system to detect falls can be both medically and economically helpful. This research introduces a portable terrain adaptable fall detection system, by placing accelerometers and gyroscopes in parts of the body and transmit data through wireless transmitter modules to mobile devices to get the related information and combining it with the center of gravity clustering algorithm introduced in this research which computes the human body behavior patterns according the relationship between the center of gravity in the body and the feet portion of the body. Compared with the research in the past, this system is not only highly accurate and robust, but also able to adapt to different types of terrains, which solves the problems that other researches have for detection errors when the client is climbing the stairs or walking on a slant.

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This study reports the growth of CuO nanowires (NWs) on glass substrate, and the fabrication of CuO-NW field emitter. Using CuO as the adhesion layer, we successfully grew CuO NWs of 2.5 μ m average length and 70 nm average diameter by thermal annealing at 450 °C for 5 h in air. It was found that turn-ON field of the fabricated field emitters was 4.5 V/μm. It was also found that the field enhancement factor β of the fabricated CuO-NW field emitter was 1610.

-Ga

Vertical well-aligned and crabwise ZnO nanowires were prepared on patterned ZnO:Ga/glass substrates by reactive evaporation method under different growth conditions. The average length and diameter of vertical well-aligned ZnO nanowires were around 1 mum and 50-100 nm, respectively. In contrast, the average length and diameter of crabwise ZnO nanowires were around 5 mum and 30 nm, respectively. Upon illumination with UV light (lambda = 362 nm), it was found that measured responsivities were 0.015 and 0.03 A/W for the crabwise ZnO nanowire photodetector biased at 10 and 15 V, respectively. Furthermore, a rejection ratio of approximately 10 was obtained for the crabwise ZnO nanowire photodetector with an applied bias of 10 V.

_2

The effect of temperature-dependent electroluminescence (EL) on nitride-based light-emitting diodes (LEDs) with different thicknesses of quantum barrier are studied and demonstrated. It was found that quantum confined stark effect (QCSE) of 6-nm thick barrier was more slightly than that of 9- and 12-nm thick barrier. The results indicated that the polarization field is independent of ambient temperature due to no clearly change of blue-shift value. The results also pointed out that the polarization field within the active region of 12-nm thick barrier was stronger than the others due to larger variation of the wavelength transition position (i.e. blue-shift change to red-shift) from 300 to 350 K, and thus it needed more injection carriers to complete the screening of QCSE. In this study, we reported a simple method to provide useful comparison of electrostatic fields within active region in nitride-based LEDs, specifically for structures consisting of identical active regions with different barrier thicknesses.