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Design of a De-ringing Filter for Wavelet-based Compressed Image
Yen-Yu Chen,Ying-Wen Chang,Wen-Chien Yen 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
JPEG2000 Standard is a new generation image compression technique, enabling encoding images at low bitrates with acceptable quality. Since JPEG2000 is based on wavelet transforms, the reconstructed image will contain perceivable ringing artifacts in medium and low bit-rate regimes of lossy compression. This work utilizes a quad-tree partitioning scheme for post-processing the reconstructed image in a spatially varying manner and presents a voting strategy to determine a set of morphological filters to be used for reducing the ringing artifacts. Simulation results demonstrate that the proposed technique enhances reconstructed image quality compared to unprocessed JPEG2000 output at an equivalent bit-rate accounting for the side-information overhead, in terms of both Peak Signal-to-Noise Ratio (PSNR) and Visible Ringing Measure (VRM).
Yu-Li Chen,Kung-Liahng Wang,Min-Yu Chen,Mu-Hsien Yu,Chen-Hsuan Wu,Yu-Min Ke,Yi-Jen Chen,Yin-Yi Chang,Keng-Fu Hsu,Ming-Shyen Yen 대한부인종양학회 2013 Journal of Gynecologic Oncology Vol.24 No.1
Objective: To evaluate the clinical outcome and parameters related to coexisting endometrial carcinoma in women with tissuediagnosed endometrial hyperplasia. Methods: Between January 1991 and December 2009, three hundred and eighty-six patients with the presumptive diagnosis of endometrial hyperplasia were retrieved. Among these, one hundred and twenty-five patients were identified as having coexisting endometrial carcinoma in hysterectomy specimens. The three hundred and eighty-six patients were divided into two groups: the hyperplasia-benign group (261 cases) and the hyperplasia-malignant group (125 cases). Several clinical parameters including age, menopausal status, history of abnormal uterine bleeding, obstetrical history, medical history of diabetes and hypertension, BMI, and preoperative pathologic results were investigated. Results: Age ≥53 (odds ratio [OR], 2.40; 95% confidence interval [CI], 1.26 to 4.57), menopausal status (OR, 2.07; 95% CI, 1.14to 3.76), diabetes history (OR, 7.33; 95% CI, 2.79 to 19.26), abnormal uterine bleeding (OR, 3.99; 95% CI, 1.22 to 13.02), atypical endometrial hyperplasia (OR, 7.38; 95% CI, 4.03 to 13.49), and body mass index ≥27 (OR, 3.24; 95% CI, 1.76 to 5.97) were independent risk factors for prediction of endometrial hyperplasia coexisting with endometrial carcinoma. The diagnostic efficacy of atypical endometrial hyperplasia to predict the endometrial hyperplasia coexisting with endometrial carcinoma was better than or similar to those of other independent factors and combinations of these factors. Conclusion: Coexisting malignancy should be considered when examining endometrial hyperplasia patients with the related risk factors, especially atypical endometrial hyperplasia.
Fabrication and Study of Novel Piezoresistive Polymer Composites Sensor for 3D Printing Applications
( Yu-yen Chen ),( Cheng-chun Huang ),( Ching-yuan Su ),( Yao-chuan Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
With the technology development, the technique of 3D printing has gradually matured. The characteristic of 3D printing is that it can print the product directly without another complex process. If the 3D printing could be applied to manufacturing sensor elements, it could be quicker and cheaper for the sensor element fabrication and the sensor forms will be applicable. Piezoresistive effect is a common sensor sensing principle which is through the deformation of the material to cause the resistance changes. In this study, a piezoresistive polymer composites material was developed, which can be manufactured by the photo-curable 3D printing. The different amount of the conductive carbon black (CB) nanoparticles was employed and added into photo-curable resin for obtaining the conductive percolation threshold of the polymer composites and measuring the piezoresistivity of the polymer composites. The conductive percolation threshold is around 1.0~1.5wt%, and the gauge factor of 1.5wt% is 9~17. The gauge factor was found which would decrease with the increasing strains. This study can be applied on fabricating the piezoresistive pressure and tactile sensors which can be used to the agricultural, industrial and various industries.
Yu-Hung Cheng,Yen-Yu Chen,Wen-Cheng J. Wei 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.5
Sublimation of Bi2O3-based materials is an important degradation issue for the long-term applications of many electronicdevices. A series of SnO2-doped Bi2O3 materials (SBO), was synthesized, densified, and then tested in air or strong reducingatmosphere. The SnO2-doping effects and sublimation kinetics of the SBO materials were studied by X-ray diffraction (XRD),scanning electron microscope (SEM) and precise mass loss measurement. The results show that formation of Bi2Sn2O7 phasegreatly retards the mass loss of SBO. The SBO samples show a surface sublimation in an energy of 52.6 kJ.mol−1. However,the sublimation is also controlled by surface microstructure as the amount of vaporizing species (the Bi or gaseous Bi-oxides)is more than 0.1 mass%. The evaporation is retarded on the rough surface and the mechanism of surface evaporation ischanged to diffusional control.
Molecular structure and developmental expression of zebrafish atp2a genes
Yen-Yu Lai,Chiung-Wen Pai,I-Ting Tsai,Chi-Yuan Chou,Chia-Ti Tsai,Yau-Hung Chen 한국유전학회 2011 Genes & Genomics Vol.33 No.5
We isolated two atp2a genes, atp2a1 and atp2a2a, from embryonic zebrafish. Amino acid sequences deduced from zebrafish atp2a genes are aligned with orthologue proteins from other species, the results showed that they share high percentage of identities (82%-94%) and acidic pIs (5.03-5.33). Whole mount in situ hybridization experiments showed that atp2a1and atp2a2a are maternal inherited genes which can be detected at 1-cell stage embryos and express in the entire animal pole from 6 hours post-fertilization (hpf) to 12 hpf. At the later stages (48-96 hpf), expression of atp2a1 was restricted in head and trunk muscles as well as in some neurons. In contrast to the strongly expression of atp2a1 in head muscle,expression of atp2a2a was detected in head muscle in a fainter manner. In addition, transcripts of atp2a2a were observed in the developing heart during early cardiogenesis. The present studies not only help us to comparatively analyze atp2a genes across species, but also provide useful information about expressions during early embryogenesis that will help in further investigations of functional studies of Atp2a in the future.
An approach to hybrid inorganic nanoparticles in reactive PS-b-PMSMA amphiphilic copolymers
Yang-Yen Yu,Chia-Liang Tsai 한국물리학회 2013 Current Applied Physics Vol.13 No.6
A series of well-defined amphiphilic poly(styrene)-block-poly 3-(trimethoxysilyl) propyl methacrylate (PS-b-PMSMA) copolymers with controlled molecular weight and block length were prepared by the atom transfer free radical polymerization. The cadmium sulfide (CdS) nanoparticles were fabricated in the spherical micelles self-assembled from these prepared PS-b-PMSMA copolymers. Then, the CdS/PSb-PMSMA films were obtained by spin coating the CdS/PS-b-PMSMA solution on silicon wafer. The experimental results showed the addition of Cu(II) could decrease the value of polydispersity index for the prepared copolymers. Nuclear magnetic resonance and Fourier transform infrared spectra showed the synthesis of PS-b-PMSMA copolymer. The average roughness and mean square roughness of the prepared CdS/PS-b-PMSMA films obtained from the atomic force microscopy analysis were 3.0e3.4 nm and 1.7e2.0 nm, respectively, indicating the excellent surface planarity. On the other hand, the ratio of block length between PS and PMSMA had a great influence on the micelle size. The larger ratio of PS to PMSMA block length resulted in the larger size of micelles and CdS nanoparticles that caused a red-shift of ultravioletevisible and photoluminescence spectra. The red-shift of spectra was explained by the quantum confinement effect associated with the tiny size of the CdS nanoparticles.
Three-Level Bi-Directional Half-Bridge CLLC Resonant Converter for DC Micro-Grid
Hsuan-Yu Yueh,Jing-Yuan Lin,Haung-Jen Chiu,Chen-Yen Chu,Yu-Chen Chang,Sih-Yi Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A Three-Level Bi-Directional Half-Bridge CLLC Resonant DC-DC converter for DC micro-grid application is studied on this paper, which uses dual resonant tanks to achieve wide range voltage regulation and meanwhile employs bi-directional capability. All power switches on this converter can achieve ZVS function at the whole load and the voltage stress on all power switches at both sides can be clamped at half of input voltage and output voltage since the three-level circuit architecture using the proposed synchronous rectifier (SR) control, therefore, the voltage stresses of the transformer, resonant tanks, power switches and other components are only half compared with conventional half-bridge CLLC resonant converter, the downsizing rated of components selection can be more flexible. Finally, the laboratory prototype is built to verify the performance of voltage balancing on input/output capacitor, voltage stress on switches and efficiency, the measured efficiency can be up to 95.6% over different load conditions.
Advanced Application of Centralized Control for a Scanning Mirror System Based on EtherCAT Fieldbus
Ruei-Yu Huang,Yen-Jen Chen,Yu-Xian Chen,Chung-Wei Cheng,Mi-Ching Tsai,An-Chen Lee 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3
Distributed control is the most popular control strategy for controlling numerous slave devices. However, the performance of slave devices is hard to improve because the control algorithm is handled by the commercial slave devices. Therefore, this paper proposes a hybrid control structure that follows the concept of centralized control strategy and handles part of the control loop on the master computer in a distributed control system through EtherCAT fieldbus. In this study, different advanced control methods such as robust control and learning control were applied to handle the position control loop of a scanning mirror system in a selective laser melting (SLM) system with stringent demand of position error around 40 µm based on EtherCAT fieldbus. By designing a proper controller, the experiment results showed that the tracking performance was significantly improved. The tracking error dropped by about 80% after the proposed hybrid control structure was applied. By applying the proposed hybrid control structure, one can improve the high-performance-requirement devices, while reducing the calculationburden of the master computer for other low-performance-requirement devices by retaining the benefit of distributed Control.