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Tainan, Taiwan

Chang Jung Christian University is a privately funded, research-intensive, Presbyterian, co-educational university located in Guiren District, Tainan, Taiwan. Chang Jung means everlasting glory in Mandarin. Wikipedia.

Chen Y.-B.,Chang Jung Christian University
Journal of Alloys and Compounds | Year: 2010

Ceramics in the system xLa(Mg1/2Ti1/2)O 3-(1 - x) (Na0.5Nd0.5)TiO3 with B2O3 additions (1 wt.%) have been investigated by the conventional solid-state route. Doping with B2O3 (1 wt.%) can effectively promote the densification and the dielectric properties of xLa(Mg1/2Ti1/2)O3-(1 - x) (Na 0.5Nd0.5)TiO3 ceramics. 0.4La xLa(Mg 1/2Ti1/2)O30.6(Na0.5Nd 0.5)TiO3 ceramics with 1 wt.% B2O3 addition possesses a dielectric constant (εr) of 42, a Qxf value of 33,000GHz (at 8 GHz) and a temperature coefficient of resonant frequency (τf5 ppm/°C sintering at 1475 ° the content of La(Mg 1/2Ti1/2)O3 increases, the highest Qxf value of 56,000 (GHz) for x = 0.8 is achieved at the sintering temperature 1500 °C. © 2009 Elsevier B.V. Source

Hsieh J.-C.,National Cheng Kung University | Lin J.-L.,Chang Jung Christian University
IEEE Transactions on Industrial Electronics | Year: 2011

A novel self-oscillating electronic ballast with dimming capability and high power factor correction (PFC) is proposed in this paper. The single-stage electronic ballast integrates a buck-boost PFC stage with a half-bridge LCC series-parallel resonant inverter. The buck-boost semistage operating in discontinuous conduction mode inherently has high PFC. The inverter is dimmable in self-oscillation mode, which is achieved using pulsewidth modulation and variable-frequency controls. The dimming circuit is simple and low cost. The self-sustained oscillation of the dimmable electronic ballast for fluorescent lamps was verified using the dual-input describing function method. A prototype of a 10-W dimmable electronic ballast was implemented to verify the theoretical analysis. © 2006 IEEE. Source

Sheu G.-Y.,Chang Jung Christian University
Computers and Geotechnics | Year: 2011

This study introduces the prediction of probabilistic settlements with the uncertainty in the spatial variability of Young's modulus to illustrate the preliminary development of a spectral stochastic meshless local Petrov-Galerkin (SSMLPG) method. Generalized polynomial chaos expansions of Young's moduli and a two-dimensional meshfree weak-strong formulation in elasticity are combined to derive the SSMLPG formulation. Because of the local and truly meshless nature, the SSMLPG method is more computationally efficient than available stochastic numerical methods. Two examples further show that SSMLPG-based predictions remain sufficiently accurate even in case of scattered nodes. Therefore, the SSMLPG method can be a valuable alternative for solving stochastic boundary-value problems. © 2011 Elsevier Ltd. Source

Su Y.-S.,Chang Jung Christian University
IEEE/ACM Transactions on Networking | Year: 2015

This paper proposes a novel scheme for the design of topology-transparent scheduling (TTS) in mobile ad hoc networks (MANETs), based on the Chinese remainder theorem (CRT). TTS can provide each node with guaranteed success in each schedule without any detailed topology information and yields a guaranteed upper bound on the transmission delay of each packet at every node in a MANET. In general, TTS requires two global constraints on the number of nodes in the MANET and the maximum nodal degree of the graph representing connectivity of the MANET. Due to the inherent mobility of MANETs, the maximum nodal degree, however, cannot be available or easily estimated. To eliminate the requirement for the maximum nodal degree, this paper proposes TTS via the CRT. By the redundancy property of the Chinese remainder representation, the proposed CRT-based scheme not only preserves the advantages of providing guaranteed success in each schedule with only the global constraint on the number of nodes in the MANET, but also offers flexibility in constructing TTS. To have a better transmission delay bound for a node with lower interference, this paper also introduces two threaded counterparts of the proposed CRT-based scheme. This paper provides performance analyses for the proposed CRT-based scheme and its threaded counterparts. Numerical results demonstrate that TTS via the CRT can outperform existing schemes, especially in scenarios with harsh interference, and is a versatile approach for the design of TTS. © 2014 IEEE. Source

Chen Y.-B.,Chang Jung Christian University
Journal of Alloys and Compounds | Year: 2011

The crystal structures, phase compositions and the microwave dielectric properties of the xLa(Mg1/2Ti1/2)O3-(1 - x)Ca0.8Sr0.2TiO3 composites prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed by the XRD patterns. Doping with B2O 3 (0.5 wt.%) can effectively promote the densification and the dielectric properties of xNd(Mg1/2Ti1/2)O3-(1 - x)Ca0.6La0.8/3TiO3 ceramics. It is found that xNd(Mg1/2Ti1/2)O3-(1 - x)Ca 0.6La0.8/3TiO3 ceramics can be sintered at 1375 °C, due to the liquid phase effect of B2O3 addition observed by Scanning Electronic Microscopy. At 1375 °C, 0.4Nd(Mg 1/2Ti1/2)O3-0.6Ca0.6La 0.8/3TiO3 ceramics with 1 wt.% B2O3 addition possesses a dielectric constant (εr) of 49, a Q × f value of 13,000 (at 8 GHz) and a temperature coefficients of resonant frequency (τf) of 1 ppm/°C. As the content of Nd(Mg 1/2Ti1/2)O3 increases, the highest Q × f value of 20,000 GHz for x = 0.9 is achieved at the sintering temperature 1400 °C. © 2011 Elsevier B.V. All rights reserved. Source

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