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Articles by Fa-Xin Yu
Total Records ( 12 ) for Fa-Xin Yu
  Zheng-Liang Huang , Fa-Xin Yu , Shu-Ting Zhang , Yao Zheng and Ji-Xin Liu
  This study describes a reliability test method for reliability evaluation of MMICs (Monolithic Microwave Integrated Circuits) in product inspection applications. It takes advantages of the potentiality of various reliability test approaches, aiming at meeting the requirement of MMIC development. In this way, quicker realistic reliability assessment can be also realized for new products or those without historic data. Applications of this prediction model to real MMICs are illustrated and a general overview of the corresponding parameters’ influence is given. The results of this study indicate in order to predict the GaAs MMICs reliability in a fixed shorter time and smaller sample size, one can design the test based on the combination of empirical methods and statistical methods. This study proposed a reliability prediction combing Arrhenius method and Weibull statistical method and we find Weibull slope is important for the MMICs reliability characterization. The analysis predicts excellent reliability for MMICs based on Arrhenius method, Weibulll method and zero fails result.
  Hua Chen , Hao Luo , Fa-Xin Yu , Zheng-Liang Huang and Ji-Xin Liu
  This study proposes a progressive transmission method for satellite images based on the integer discrete cosine transform. It has two characteristics, low-complexity and lossless reconstruction ability. Besides, high quality intermediate image can be obtained at the early stage with a low bit rate. The reconstructed images visual quality at stage 4 is acceptable and the associated bit rate is approximately 0.2. In addition, when all stages transmission completed, the reconstructed image is accurately recovered. Experimental results demonstrate the effectiveness of the proposed method and show it outperforms the classical low-complexity progressive transmission method based on BPM. Our method can be used in many practical applications of satellite image transmission.
  Hao Luo , Fa-Xin Yu , Hui Li and Zheng-Liang Huang
  This study proposes a novel simple scheme for color image encryption. The RGB color components of the input image are permuted and transformed into the YCbCr color space. Then three simultaneous equations are constructed for secret sharing of the luminance and two chrominance components. After several iterations, the output of this equation set is the encrypted content. These encrypted channels are recomposed to the encrypted image. In image decryption, we merely need to solve the simultaneous equation set based on Largrange’s interpolation with several inverse iterations. The decrypted image is of very high quality for only slight degradation is introduced due to the color space mapping. Security of our scheme is well preserved as long as the permutation key kept secret. Experimental results validate the effectiveness of the proposed method.
  Xiao-Lin Zhou , Fa-Xin Yu , Yu-Chun Wen , Zhe- Ming Lu and Guang-Hua Song
  This study proposed a method for early fire detection in video based on flame contours. The whole fire detection process includes three parts, i.e., candidate fire frame selection, flame region selection and flame contour-based fire decision. In the first step, the suspicious frames are detected and the unlikely frames are removed based on frame selection rules. The second step detects the flame pixels in the candidate fire frames by flame region selection rules. In the last step, four operations (i.e., dilation, erosion, mini region erasing and Canny edge detection) are performed on all flame regions to obtain the exact flame contours and then fire decision rules based on three characteristics (i.e., area, perimeter and roundness of flame contours) are employed to determine whether a fire occurs in the video or not. The proposed approach was tested with several video clips in different environments and the experimental results demonstrated its effectiveness.
  Hao Luo , Fa-Xin Yu , Jeng-Shyang Pan , Shu-Chuan Chu and Pei-Wei Tsai
  Biometric technology is an efficient personal authentication and identification technique. As one of the main-stream branches, vein recognition has drawn much attention among researchers and diverse users. This study proposes a survey of vein recognition techniques. The basic principle, key techniques, performance evaluation metrics, application fields and future trends are extensively analyzed. In particular, in the key techniques, most previous work is systematically described and compared in three parts, i.e., vein image acquisition and preprocessing, feature extraction and feature matching. According to the available work in theoretical analysis reports in literatures and commercial utilization experiences, vein recognition has been proved to be an effective, secure and reliable choice of high precision among biometrics techniques. It maintains an excellent promise in various applications.
  Fa-Xin Yu , Jia-Rui Liu , Zheng-Liang Huang , Hao Luo and Zhe-Ming Lu
  With the development of astronautic techniques, the radiation effects on Integrated Circuits (ICs) have been cognized by people. Environments with high levels of ionizing radiation create special design challenges for ICs. To ensure the proper operation of such systems, manufacturers of integrated circuits and sensors intended for the military aerospace markets adopt various methods of radiation hardening. An overview of radiation hardening techniques for IC design is given in this study. First, seven major radiation damage sources, two fundamental damage mechanisms, five sorts of end-user effects and six types of single-event effects are introduced, followed by the brief introduction of radiation hardening techniques. Secondly, typical physical radiation hardening techniques are introduced. Thirdly, typical logical radiation hardening techniques are introduced. Fourthly, we propose our radiation hardening scheme for microwave power amplifier chip design. Here, a Radio-Frequency (RF) Power Amplifier (PA) is a sort of electronic amplifier employed to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. Finally, we concluded the whole study.
  Hui Li , Fa-Xin Yu , Xiao-lin Zhou and Hao Luo
  In delay tolerant mobile networks, there are always no end-to-end paths due to sparse nodes and their irregular movement, so the forwarding of messages from source nodes to the destinations is a crucial task, which results in low probability of successful messages delivery and buffer occupancy for a long time. Routing in these networks is affected by some metrics, but the number of new connections especially is the crucial factor in delivering messages. Under this detection, we proposed every connection routing, which pay more attention to new connections between nodes but not the older ones. Further together with countdown timer and a fast buffer-released mechanism, every connection routing, are influenced by nodes’ speed, communication range and number, expiration time and simulation area. Buffer-release-enhanced weighted every connection routing may only increase processing time by the introducing of messages releasing time, but the benefit is lighter loaded buffers and higher efficiency of networks. The performance of buffer-release-enhanced weighted every connection routing is able to guarantees the validity of message delivery and improve the efficiency of the networks.
  Xiao-Lin Zhou , Fa-Xin Yu , Yu-Chun Wen and Zhe-Ming Lu
  With the rapid development of the Internet and extraordinary increase of bandwidth requirement, fiber based networks emerge and become more and more popular. The EPON (Ethernet Passive Optical Network) technology, which combines the mature Ethernet technology and high-bandwidth PON technology, is an ideal access method to achieve fiber based network service and appears to be the most widely-used access network. Thus, information reliability is becoming more and more important, making the protection of fiber based networks more and more necessary and crucial. Nowadays most EPONs are protected against failures by adopting redundant network equipments. This study proposes a novel protection method for EPON, which is more reliable and safer than existing schemes. This protection architecture scheme is able to provide protection for EPON and point out the exact failure reason for further physical recovery and repairing by the Network Management (NM) Server. Actual operations show that the proposed scheme can provide protection for at least three types of failures, i.e., the ONU link failure, the OLT link failure and the OLT failure.
  Wei Chen , Hao Luo , Min Zhou , Zhe-Ming Lu , Yong-Heng Shang and Fa-Xin Yu
  In this study a level converter based on GaAs pHEMT technology for a MFC (Multifunctional Chip) is designed, simulated and tested for the application of T/R (Transmit/Receive) module for an X band phase array radar system. It has the advantages of smaller chip size, lower power consumption, higher efficiency, lower cost and high stability. The circuit design is based on a feedback and feed-forward network which compensates the chip process variations during the wafer fabrication and operation temperature changing. It results the designed chip has a high stability. Its supply voltage is -5 v with a shared bias generator, this allows reducing the power consumption compared with the other design at -7.5 v in the literature. The testing results have shown that the proposed novel design has met all the specifications given in this project.
  Zheng-Liang Huang , Zhe-Ming Lu , Fa-Xin Yu and Yong Zhang
  Fast face detection is very essential for many applications such as video surveillance and human computer interface. This study presents a fast face detection method using the HSV-based skin color model under non-constrained scene conditions. First, a skin color model that combines the HSV color space with K-L transform-based skin color filter is designed. Then, skin regions in the input image are detected and face candidates based on the spatial arrangement of these skin patches are generated. Finally, the mouths in all of the candidate human face regions are verified by a mouth detector. Experimental results show that the proposed scheme is not only fast and efficient, but also robust to head rotation.
  Yi-Qun Hu , Hao Luo , Yong-Heng Shang and Fa-Xin Yu
  A novel highly integrated front-end TR (Transmit-Receive) module with four RF (Radio Frequency) channels for the application of a K-Band transceiver is introduced. The housing cavity of the proposed TR module is based on the LTCC (Low Temperature Co-Fired Ceramics) technology with embedded passive RF circuit, control signal circuit and bias power supply circuit. Due to the employing of the LTCC technology, it allows to reduce the overall size and weight of the designed TR module. Furthermore, such design improves the overall performance of the TR module with a lower cost and high efficiency.
  Yu-Chun Wen , Fa-Xin Yu , Xiao-Lin Zhou and Zhe-Ming Lu
  This study presents a novel fire detection method based on vector quantization. Before online fire detection, we generate a fire codebook and a non-fire codebook by the LBG algorithm based on the training set that are selected from 10 video clips under different scenes and conditions. For encoding convenience, we merged the two codebooks into one codebook and sorted the codewords in the ascending order of their mean values for the future Equal-average Equal-variance Equal-norm Nearest Neighbor Search (EEENNS) based fast encoding process. In the online fire detection process, the video to be detected was first segmented into successive frames and we performed the VQ (Vector Quantization) encoding process to find fire-colored frames and recorded the grade of each fire-colored area. Then, the moving pixel detection process was performed on each fire-colored frame to find candidate fire frames. Finally, we verified whether a fire occurs or not and graded the fire by analyzing the change in the number of blocks belonging to each grade between consecutive frames. Experimental results demonstrated the effectiveness of the proposed scheme and a 93.3% detection rate was obtained with 25 test video clips.
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