Wu Feng Institute of Technology

Chiayi, Taiwan

Wu Feng Institute of Technology

Chiayi, Taiwan

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Hsieh J.-Y.,Sudan University of Science and Technology | Hsieh J.-Y.,Minghsin University of Science and Technology | Chiang T.-Y.,National Cheng Kung University | Chen J.-L.,Wu Feng Institute of Technology | And 3 more authors.
Journal of Molecular Modeling | Year: 2011

Molecular dynamics simulations of the biphalin molecule, (Tyr-D-Ala-Gly-Phe-NH) 2, and the active tetrapeptide hydrazide, Tyr-D-Ala-Gly-Phe-NH-NH 2 were performed to investigate the cause of the increased μ and δ receptor binding affinities of the former over the latter. The simulation results demonstrate that the acylation of the two equal tetrapeptide fragments of biphalin produces the constrained hydrazide bridges {\hbox{C}}-4{\alpha } - {{\hbox{C}}-4}\prime - {{\hbox{N}}-9} - {{\hbox{N}}-{{10}}} and {{\hbox{N}}-9} - {{\hbox{N}}-{{10}}} - {{\hbox{C}}-5}\prime - {\hbox{C}}-5{\alpha } , which in turn increase the opportunity of conformations for binding to μ or δ receptors. Meanwhile, the connection of the two active tetrapeptide fragments of biphalin also results in the constrained side chain torsion angle χ 2 at one of the two residues Phe. This constrained side chain torsion angle not only significantly increases the δ receptor binding affinity but also makes most of the δ receptor binding conformations of biphalin bind to the δ receptor through the fragment containing the mentioned residue Phe. © 2010 Springer-Verlag.


Kuo D.-M.,National Cheng Kung University | Wang S.-J.,National Cheng Kung University | Uang K.-M.,Wu Feng Institute of Technology | Chen T.-M.,Wu Feng Institute of Technology | And 3 more authors.
IEEE Photonics Technology Letters | Year: 2010

Through the use of polystyrene nano-spheres as a 2-D mask for the patterned-deposition of indium-zinc-oxide (IZO) and annealed Pt-Al-Pt as a high reflectivity p-ohmic/mirror layer, vertical GaN-LEDs with atop periodic IZO nano-wells (NW-VLEDs) were fabricated. At 350 mA, NW-VLEDs exhibited a crucial VF reduction of 0.1 V with an enhancement of 87% in light output and 92% in power conversion efficiency as compared to regular vertical GaN-LEDs, which should be attributed to the combination of the effectiveness of high-reflectivity ohmic contact, IZO current spreading layer, and the enhanced light extraction efficiency from the periodic nano-wells. © 2010 IEEE.


Chia S.-H.,Wu Feng Institute of Technology | Su K.-L.,Sudan University of Science and Technology | Guo J.-H.,Sudan University of Science and Technology | Chung C.-Y.,Sudan University of Science and Technology
Proceedings - 4th International Conference on Genetic and Evolutionary Computing, ICGEC 2010 | Year: 2010

Ant colony optimization (ACO) is a new evolvement algorithm that is proposed by Dorigo M., and solves some task allocation and target search problems to program the motion path searching food. The topic of the article uses the ant colony optimization algorithm to mobile robot system, and solve the problem of mobile robot path planning such that the target point in a collision free space. The simulated results presents that ACO can finds the optimization motion path for mobile robot moving to the target position (food) from the start position (nest) in a collision-free environment. © 2010 IEEE.


Tay K.-W.,Wu Feng Institute of Technology | Fu Y.-P.,National Dong Hwa University | Huang J.-F.,Wu Feng Institute of Technology | Huang H.-C.,Wu Feng Institute of Technology
Ceramics International | Year: 2011

The microwave dielectric properties of Sm(Mg0.5Ti 0.5)O3 incorporated with various amount of Bi 2O3 and B2O3 additives have been investigated systematically. In this study, both Bi2O3 and B2O3 additives acting as a sintering aid can effectively lower the sintering temperature from 1550 °C to 1300 °C. The ionic radius of Bi3+ for a coordination number of 6 is 0.103 nm, whereas the ionic radius of B3+ is 0.027 nm. Clearly, the ionic radius of Bi3+ is greatly larger than one of B3+, which resulted in the specimens incorporated with Bi2O3 having larger lattice parameters and cell volume than those incorporated with B 2O3. The experimental results show that no second phase was observed throughout the entire experiments. Depending on the interfacial tension, the liquid phase may penetrate the grain boundaries completely, in which case the grains will be separated from one another by a thin layer as shown in Sm(Mg0.5Ti0.5)O3 ceramics incorporated with Bi2O3. Whereas, in Sm(Mg0.5Ti 0.5)O3 ceramics incorporated with B2O 3, the volume fraction of liquid is high, the grains may dissolve into the liquid phase, and rapidly rearrange, in which case contact points between agglomerates will be dissolved due to their higher solubility in the liquid, leading plate-like shape microstructure. A dielectric constant (εr) of 29.3, a high Q × f value of 26,335 GHz (at 8.84 GHz), and a τf of -32.5 ppm/°C can be obtained for Sm(Mg 0.5Ti0.5)O3 ceramics incorporated with 10 mol% Bi2O3 sintered at 1300 °C. While Sm(Mg 0.5Ti0.5)O3 ceramics incorporated with 5 mol% B2O3 can effectively lower temperature coefficient of resonant frequency, which value is -21.6 ppm/°C. The Sm(Mg 0.5Ti0.5)O3 ceramic incorporated with heavily Bi2O3 and B2O3 additives exhibits a substantial reduction in temperature (∼250 °C) and compatible dielectric properties in comparison with that of an un-doped one. This implied that this ceramic is suitable for miniaturization in the application of dielectric resonators and filters by being appropriately incorporated with a sintering aid. © 2010 Elsevier Ltd and Techna Group S.r.l.


Liu Y.-C.,Wu Feng Institute of Technology | Fu Y.-P.,National Dong Hwa University
Ceramics International | Year: 2010

Copper ferrite nanopowders were successfully synthesized by a microwave-induced combustion process using copper nitrate, iron nitrate, and urea. The process only took a few minutes to obtain CuFe2O 4 nanopowders. The resultant powders were investigated by XRD, SEM, VSM, and surface area measurement. The results revealed that the CuFe 2O4 powders showed that the average particle size ranged from 300 to 600 nm. Also, it possessed a saturation magnetization of 21.16 emu/g, and an intrinsic coercive force of 600.84 Oe, whereas, upon annealing at 800 °C for 1 h. The CuFe2O4 powders specific surface area was 5.60 m2/g. Moreover, these copper ferrite magnetic nanopowders also acted as a catalyst for the oxidation of 2,3,6-trimethylphenol to synthesize 2,3,5-trimethylhydrogenquinone and 2,3,5-trimethyl-1,4- benzoquinone for the first time. On the basis of experimental evidence, a rational reaction mechanism is proposed to explain the results satisfactorily. © 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Tay K.-W.,Wu Feng Institute of Technology | Fu Y.-P.,National Dong Hwa University | Huang Q.-F.,Wu Feng Institute of Technology | Jang F.-H.,National Dong Hwa University
Ceramics International | Year: 2010

Bi2O3 was selected as liquid phase sintering aid to lower the sintering temperature of La(Mg0.5Ti0.5)O3 ceramics. The sintering temperature of La(Mg0.5Ti0.5)O3 ceramics is generally high, about 1600 °C. However, the sintering temperature was significantly lowered about 275 °C from 1600 °C to 1325 °C by incorporating in 15 mol% Bi2O3 and revealed the optimum microwave dielectric properties of dielectric constant (εr) value of 40.1, a quality factor (Q × f) value of 60,231 GHz, and the temperature coefficient (τf) value of 70.1 ppm/°C. During all addition ranges, the relative dielectric constants (εr) were different and ranged from 32.0 to 41.9, the quality factors (Q × f) were distributed in the range of 928-60,231 GHz, and the temperature coefficient (τf) varies from 0.3 ppm/°C to 70.3 ppm/°C. Noticeably, a nearly zero τf can be found for doping 5 mol% Bi2O3 sintering at 1325 °C. It implies that nearly zero τf can be achieved by appropriately adjusting the amount of Bi2O3 additions and sintering temperature for La(Mg0.5Ti0.5)O3 ceramics. © 2010.


Chi J.-H.,Wu Feng Institute of Technology | Wu S.-H.,National Yunlin University of Science and Technology | Shu C.-M.,National Yunlin University of Science and Technology
Simulation Modelling Practice and Theory | Year: 2011

Statistical data over the past 24 years detailing the number of fires and building floor areas published by the Taiwan government was employed to determine the fire probability, frequency, and cycle for each building category. By applying a matrix calculation, the fire probability, frequency, cycle, and risk ratio for each functional area within a multi-purpose building were obtained. With assistance from the Taiwan government, the fire case investigation and statistical data for building fires were established. By adopting the risk ratio concept, the weight values for 20 fire safety assessment criteria and 4 fire safety strategies for a multi-purpose building were acquired to indicate the possible causes of fires and the quantitative extent of fire influence. © 2010 Elsevier B.V. All rights reserved.


Chia S.-H.,National Yunlin University of Science and Technology | Chia S.-H.,Wu Feng Institute of Technology | Su K.-L.,National Yunlin University of Science and Technology | Shiau S.-V.,National Yunlin University of Science and Technology | Chien T.-L.,Wu Feng Institute of Technology
Proceedings of the 15th International Symposium on Artificial Life and Robotics, AROB 15th'10 | Year: 2010

The paper develops a multi-level multi-sensor based security system that has multiple interfaces to be applied in intelligent home. The security system contains four levels. There is passive detection level, active detection level, system supervised level and remote supervised level. The control unit of these passive modules is HOLTEK microchip. Each passive module has two variety interfaces (wireless RF and voice). These modules can use voice to alarm users for event condition, and transmit the real-time status and image signal to the active detection level and system supervised level via wireless RF interface. The active detection level can communicate with other level via wireless RF interface or wireless Internet. The remote supervised level, supervised level and active detection level can communicate with other level via wireless Internet. It can display status of these modules on the monitor. Finally, we present some experimental results using passive and active detection modules on the security system. © 2010 ISAROB.


Chia S.-H.,National Yunlin University of Science and Technology | Su K.-L.,National Yunlin University of Science and Technology | Shiau S.-V.,National Yunlin University of Science and Technology | Chien T.-L.,Wu Feng Institute of Technology
Artificial Life and Robotics | Year: 2011

This article describes a multilevel multisensor-based security system that has multiple interfaces to be applied in an intelligent home. The security system contains four levels. There is a passive detection level, an active detection level, a system supervising level, and a remote supervising level. The control unit of these passive modules is a HOLTEK microchip. Each passive module has two different interfaces (wireless RF and voice). These modules can use a voice to alarm users than an event has occurred, and can transmit the real-time status and image signal to the active detection level and the system's supervising level via the wireless RF interface. The active detection level can communicate with other levels via the wireless RF interface or the wireless Internet. The remote supervising level, the supervising level, and the active detection level can communicate with other levels via the wireless Internet. The status of these modules can also be displayed on the monitor of the supervising computer. Finally, we present some experimental results using passive and active detection modules in the security system. © ISAROB 2011.


Tay K.-W.,Wu Feng Institute of Technology | Huang T.-Y.,Wu Feng Institute of Technology
Ceramic Transactions | Year: 2010

The research mainly investigated the microwave dielectric properties of Nd(Mg0.5Ti0.5)O3 by adding different sintering aids, such as B2O3, Bi2O3, and V2O5 for lowering the sintering temperature. The sintered Nd(Mg0.5Ti0.5)O3 ceramics are characterized by X-ray diffraction spectra and scanning electron microscopy (SEM). The sintering temperature of Nd(Mg0.5Ti0.5)O3 ceramics with 10 mol% B2O3 additions can be effectively reduced from 1500°C to 1325°C, and the dielectric constant (εr) value of 26.2, a quality factor (Qxf) value of 61307 (at 9.63GHz), and τf value of -45.5ppm/°C. The εr 26.8, Qxf 27506 (at 9.87GHz), and τf value of -52.6 ppm/°C, respectively, were obtained for 10 mol% Bi2O3 -doped Nd(Mg0.5Ti0.5)O3 ceramics sintered at 1325°C. The εr 24.8, Qxf 15481 (at 10.02 GHz), and tau;f value of-57.8 ppm/°C, respectively, were obtained for 10 mol% V2O5 -doped Nd(Mg0.5Ti0.5) O3 ceramics sintered at 1375°C. Small values (∼ 3.5 ppm/°C) of τf are obtained for Nd(Mg0.5Ti 0.5)O3 ceramics with 10 mol% B2O3 additions. Therefore, Nd(Mg0.5Ti0.5)O3 with 10 mol% B2O3 additions may be suggested for application in microwave communication devices.

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