Chang Jung Christian University

www.cjcu.edu.tw
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.


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Patent
Chang Jung Christian University | Date: 2016-08-24

An anonymous authentication method is implemented by an authentication device that has a key array. The key array has multiple array dimensions each having multiple device keys. The method includes: receiving ciphertexts from a chip that has multiple chip keys; acquiring authentication keys by: for each of the ciphertexts, performing trails of decryption using the device keys of one of the array dimensions that corresponds to one of the chip keys used to generate the ciphertext one by one until obtaining one of the device keys that successfully decrypts the ciphertext to serve as one of the authentication keys; and obtaining, for authentication, information associated with the chip according to the authentication keys.


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.


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

The effects of BaCu(B2O5) additives on the sintering temperature and microwave dielectric properties of (Mg0.7Zn 0.3)0.95Co0.05TiO3 ceramics were investigated. The (Mg0.7Zn0.3)0.95Co 0.05TiO3 ceramics were not able to be sintered below 1000 °C. However, when BaCu(B2O5) were added, they were sintered below 1000 °C and had the good microwave dielectric properties. It was suggested that a liquid phase with the composition of BaCu(B 2O5) was formed during the sintering and assisted the densification of the (Mg0.7Zn0.3)0.95Co 0.05TiO3 ceramics at low temperature. BaCu(B 2O5) powders were produced and used to reduce the sintering temperature of the (Mg0.7Zn0.3) 0.95Co0.05TiO3 ceramics. Good microwave dielectric properties of Q × f = 35,000 GHz, εr = 18.5.0 and τf = -51 ppm/°C were obtained for the (Mg 0.7Zn0.3)0.95Co0.05TiO3 ceramics containing 7 wt.% mol% BaCu(B2O5) sintered at 950 °C for 4 h. © 2011 Elsevier B.V. All rights reserved.


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

Ceramics in the system La(Mg1-xZnx) 1/2Ti1/2O3 with B2O3 additions (1 wt.%) have been investigated by the conventional solid-state route. The XRD patterns of the sintered samples (0.3 ≤ x ≤ 1.0) revealed single phase formation with a structure. The unit cell volume slightly increased with increasing Zn content (x). La(Mg1-xZnx) 1/2Ti1/2O3 were found to form perovskite solid solutions in the whole compositional range. The maximum values of the dielectric constant and the quality factor multiples resonant frequency (Q × f) can be obtained when the La(Mg0.7Zn0.3)1/2Ti 1/2O3 with 0.5 wt.% B2O3 additive were sintered at 1475 °C for 4 h. The temperature coefficient of resonant frequency τf (-63 ppm/°C) was measured for x = 0.7. © 2010 Elsevier B.V. All rights reserved.


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

The microwave dielectric properties of (1 - x)SrTiO3-xNd(Mg 1/2Ti1/2)O3 ceramics prepared by the conventional solid state method have been investigated. Doping with 0.25 wt% B2O3 can effectively promote the densification and the microwave dielectric properties of (1-x)SrTiO3-xNd(Mg 1/2Ti1/2)O3. The dielectric constant decreases from 132 to 24 as x varies from 0.3 to 0.9. In the (1 - x)SrTiO 3-xNd(Mg1/2Ti1/2)O3 system, the microwave dielectric properties can be effectively controlled by varying the x value. At 1475 °C, 0.1SrTiO3-0.9Nd(Mg1/2Ti 1/2)O3 has a dielectric constant (εr) of 45.4, a Q × f value of 44,000 GHz and a temperature coefficient of resonant frequency (τf) of -3 ppm/°C. © 2010 Elsevier B.V. All rights reserved.


Chen Y.-B.,Chang Jung Christian University
Journal of Alloys and Compounds | Year: 2012

Solid solutions of [(Mg, Zn)] 2TiO 4-Co 2TiO 4 were used to prepare [(Mg 1-xZn x) 0.95Co 0.05] 2TiO 4 have been fabricated using solid-state synthesis for mobile communications. The effect of Zn 2+ and Co 2+ substitution were to enhance Q × f value and densification sintering at lower temperature compared to Mg 2TiO 4 which sintered at 1450 °C. As an optimal compose, [(Mg 0.5Zn 0.5) 0.95Co 0.05] 2TiO 4 successfully demonstrated a dielectric constant of 18.18, a Q × f of 206,000 GHz and a τ f value of -20.8 ppm/°C sintered at 1225 °C. The maximum quality factor multiples resonant frequency (Q × f) value of around 2100,000 GHz was obtained for the [(Mg 0.6Zn 0.4) 0.95Co 0.05] 2TiO 4, and added more Zn 2+, the Q × f decrease [(Mg 0.5Zn 0.5) 0.95Co 0.05] 2TiO 4. © 2011 Elsevier B.V. All rights reserved.


Patent
Chang Jung Christian University | Date: 2011-09-20

A manipulator with three degrees of freedom includes three actuators connected to a moving platform at angularly spaced apart positions that form vertices of a first regular triangle and connected to a base platform at angularly spaced apart positions that form vertices of a second regular triangle. A normal line through a centroid of the first regular triangle is aligned with a normal line through a centroid of the second regular triangle when the moving platform is at an initial position. A control method for the manipulator includes configuring the manipulator to compute respective lengths of the actuators based upon a desired roll angle, a desired pitch angle and a desired heave height, and to set the actuators to the respective lengths so that the moving platform moves to the desired roll angle, the desired pitch angle, and the desired heave height with respect to the base platform.


Patent
Chang Jung Christian University | Date: 2012-07-19

In an image deblurring method, an image processor determines an absolute difference between a pixel value of each pixel in a current image frame and a pixel value of a corresponding pixel in a reference image frame to obtain a total absolute difference corresponding to the current image frame by summing up the absolute differences corresponding respectively the pixels of the current image frame. When the total absolute difference is smaller than a predetermined first threshold value and not smaller than a predetermined third threshold value, the image processor generates an interpolated image frame based on the current and reference image frames using one of unidirectional motion estimation and bidirectional motion estimation.


Patent
Chang Jung Christian University | Date: 2011-07-28

A chip card device includes: a first insulative substrate; a chip unit disposed on an inner side of the first insulative substrate; a first conductive wiring disposed on the inner side of the first insulative substrate, and including a first chip-connecting end that is electrically connected to the chip unit, and a first open circuit terminal opposite to the first chip-connecting end; and a second conductive wiring disposed on the inner side of the first insulative substrate and including a second chip-connecting end that is electrically connected to the chip unit, and a second open circuit terminal that is opposite to the second chip-connecting end, and that can be electrically connected to the first open circuit terminal through an external touching member.


Patent
Chang Jung Christian University | Date: 2011-09-09

In a flame identification method and device for identifying any flame image in a plurality of frames captured consecutively from a monitored area, for each image frame, intensity foreground pixels are obtained based on intensity values of pixels, a fire-like image region containing the intensity foreground pixels is defined when an intensity foreground area corresponding to the intensity foreground pixels is greater than a predetermined intensity foreground area threshold, and saturation foreground pixels are obtained from all pixels in the fire-like image region based on saturation values thereof to obtain a saturation foreground area corresponding to the saturation foreground pixels. Linear regression analyses are performed on two-dimensional coordinates each formed by the intensity and saturation pixel areas associated with a corresponding image frame to generate a determination coefficient. Whether a flame image exists in the image frames is determined based on the determination coefficient and a predetermined identification threshold.

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