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Application of Green Collaboration Operation on Network Industry
Ruey-Shun Chen,Yeh-Cheng Chen,Chi Nung Chu,Hung-Min Sun,Ling-Chi Chen,Chia-Chen Chen 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.2 No.1
Traditional information system and managerial mechanism cannot meet the new environment protection regulations; therefore, a new solution must be set up, else it may run the risk of losing the market and the value of product brand.This research focuses on the solutions provided by the network and communication industry, manufacture of the green products, and the establishment of a Web-based green collaboration management system, which incorporates the environment protection requests into the product development and green supply chain activities. There are three goals: (1) For the design of green products, green components and product management are set up for the purpose of de-toxin and ease of disassemble; (2) For the green supply chain, the management of hazardous substances, product recycle and disassemble are set up; (3) For the product recycling management, the recycling information is feedback for the product update and collaboration operation. The result of research can provide information for the integration of workflow and information system currently in use, provide RoHS and WEEE management solutions, and set up green collaboration information system, so that green products, brand leadership, and environment protection endeavor can be assured.
Wei-Che Lin,Wen-Chieh Chen,Pei-Wen Wang,Yi-Chia Chan,Yen-Hsiang Chang,Harn-Shen Chen,Szu-Tah Chen,Wei-Chih Chen,Kai-Lun Cheng,Shun-Yu Chi,Pi-Ling Chiang,Chen-Kai Chou,Feng-Fu Chou,Shun-Chen Huang,Feng 대한초음파의학회 2023 ULTRASONOGRAPHY Vol.42 No.3
Radiofrequency ablation (RFA) is a minimally invasive management strategy that has been widely applied for benign and recurrent malignant thyroid lesions as an alternative to surgery in Taiwan. Members of academic societies for specialists in interventional radiology, endocrinology, and endocrine surgery collaborated to develop the first consensus regarding thyroid RFA in Taiwan. The modified Delphi method was used to reach a consensus. Based on a comprehensive review of recent and valuable literature and expert opinions, the recommendations included indications, pre-procedural evaluations, procedural techniques, post-procedural monitoring, efficacy, and safety, providing a comprehensive review of the application of RFA. The consensus effectively consolidates advice regarding thyroid RFA in clinical practice for local experts.
Apoptosis induced in vivo by new type gosling viral enteritis virus
Shun Chen,Anchun Cheng,Mingshu Wang,Dekang Zhu,Renyong Jia,Qihui Luo,Hengmin Cui,Yi Zhou,Yin Wang,Zhiwen Xu,Zhengli Chen,Xiaoyue Chen,Xiaoyu Wang 대한수의학회 2011 JOURNAL OF VETERINARY SCIENCE Vol.12 No.4
In this study, apoptosis was induced by new type gosling viral enteritis virus (NGVEV) in experimentally infected goslings is reported in detail for the first time. After 3-day-old goslings were orally inoculated with a NGVEV-CN strain suspension, the time course of NGVEV effects on apoptotic morphological changes of the internal tissues was evaluated. These changes were observed by histological analysis with light microscopy and ultrastructural analysis with transmission electron microscopy. DNA fragmentation was assessed with a terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay and DNA ladder analysis. A series of characteristic apoptotic morphological changes including chromatin condensation and margination, cytoplasmic shrinkage, plasma membrane blebbing, and formation of apoptotic bodies were noted. Apoptosis was readily observed in the lymphoid and gastrointestinal organs, and sporadically occurred in other organs after 3 days post-infection (PI). The presence and quantity of TUNEL-positive cells increased with infection time until 9 days PI. DNA extracted from the NGVEV-infected gosling cells displayed characteristic 180~200 bp ladders. Apoptotic cells were ubiquitously distributed, especially among lymphocytes, macrophages, monocytes, and epithelial and intestinal cells. Necrosis was subsequently detected during the late NGVEV-infection phase, which was characterized by cell swelling, plasma membrane collapse, and rapidly lysis. Our results suggested that apoptosis may play an important role in the pathogenesis of NGVE disease.
Shun-Tong Chen,Wei-Yu Jhou 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.4
This study examines the development of a “dual-crankshaft out-of-phase balanced drive mechanism” and its application in the realization of high-frequency scraping in the production of highly precise, extremely dense microconcavity patterns. The high-density microcavity mold can produce micro-lens arrays, which achieve energy saving through the light-gathering effect. A monocrystalline diamond tool driven by the designed positive drive mechanism facilitates scraping at a highfrequency using positively reciprocated motion. To inhibit system vibration caused by a single crankshaft, a dual-crankshaft out-of-phase balanced drive mechanism is developed, which allows both the primary drive shaft and balance shaft to possess identical eccentric distance with their eccentric forces going in opposite directions. The design off sets the eccentric force made by revolution of the primary drive shaft against the simultaneous force made by the revolving balance shaft. Experiments show that when system vibration error is restrained to 1-μm, the single crankshaft tool reaches a drive frequency of 15 Hz. While under the dual-crankshaft out-of-phase setup, drive frequency reached up to 50 Hz. Further experimental results demonstrated that the dual-crankshaft out-of-phase balanced drive mechanism has the capability of scraping a vast microconcavity pattern with high-precision, -integrity and -consistency. Characteristic surface roughness of microcavities was below Ra 0.024 μm and feature edges were burr-free. In addition, this paper discusses in detail: the material shear rate, scraping force prediction, influences of the workpiece forward feed-rate and tool actuation frequency as well as the relationship between major and minor axes in microconcavity formation.
Progressive failure of metal–composite hybrid wheels under impact
Shun-Fa Hwang,Hui-Lun Yu,Yu-Jen Liu,Yuder Chen,Shih-Chieh Chen,Yueh-Chih Hsieh 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
An 18-in hybrid wheel consisting of an aluminum alloy disk and a composite rim under 13° impact test is considered in this study. The rim is made of carbon fabric/polyurethane composites fabricated by resin transfer molding. Explicit finite element analysis with progressive failure function is used to investigate the failure situation of the hybrid wheel and the suitable braid angle of the braided composite. The effective elastic constants and strengths of the braided composites predicted by basic finite element analyses are adopted, whereas the true stress–strain curve of aluminum is used for the disk. Simulation results indicate that the aluminum alloy disk is safe after the impact test, whereas the rim is damaged. The volume of failed elements after impact simulation is selected as an indicator to obtain a quantity that can be used to represent the damage situation of the rim. Compared with the test results of a real hybrid wheel with [±30°] fiber angle in the rim, the hybrid wheel with fiber angle in the rim that is greater than [±30°] could pass the impact test.
Backstepping Control with Sum of Squares Design for Omni-directional Mobile Robots
Shun-Hung Chen,Jyh-Ching Juang,Sin-Hwa Su 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a backstepping control method using sum of squares (SOS) technique to synthesize a nonlinear controller for a three wheels omni-directional mobile robot. The characteristic of strict-feedback systems is also applied to construct the backstepping controller. The controller design satisfies the Lyapunov direct method and LaSalle-Yoshizawa theorem so that the stability of control systems can be assured. Subsequently, the sum of squares conditions are developed to constraint the performances such that the backstepping controller is optimal. Computer simulations and experimental results for mobile robots demonstrate the effectiveness of the proposed backstepping controller.
Shun-Tong Chen,Shih-Yao Chen 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6
A high-frequency discharge power source with non-equal energy relaxation oscillator circuit is proposed in this study. An experiment based on gallium oxide (Ga2O3) and an aluminum alloy microstructure array is devised to verify the machining performance of the power source. Signals are sent by a field-programmable gate array (FPGA) for the control of an N-MOSFET load switch, thus determining when the power source charged and discharged to generate a discharge waveform with narrow pule width and alternating high and low peaks. Compared to a conventional RC discharge circuit, the proposed design generated a pulse train with a regular and dense pattern and created high-density and tiny-energy high-temperature plasma. The experiment was performed with a high-frequency discharge energy pulse train designed with alternating high and low-peaks to examine the machining performance of the discharge source for pyrolytic Ga2O3 material including: the best-fit capacitance combination, feed-rate of wire-electrode, material removal rate, kerf width and spark erosion capability. The experiment’s results revealed that the design high-frequency relaxation oscillator circuit successfully generated surface microstructure arrays and pillared microstructure with outstanding dimensional accuracy and consistence. Clearly, the application of the proposed high-frequency power source proposed performed admirably in spark erosion in addition to its high-efficiency, -controllability, and -stability, and it prevented thermal damage to microstructures. The workpiece’s polarity, surface roughness, material removal mechanism, surface degenerating layer and discharging performance of metal and semiconductor are analyzed both quatitatively and qualitatively.
Shun-Tong Chen,Kuo-En Chang,Wei-Ping Huang,Hong-Ye Yang,Xiu-Mao Lee 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
This study presents the development of a cost-effective high-precision bench machine tool prototype for machining multi-level micro aspheric lighting-lens molds. To achieve high-precision over a long lifetime of micromachining, the bench machine tool is designed using a small C-shaped framework to strengthen static rigidity and vibration resistance. The primary structures of the machine tool are constructed with tempered nodular graphite cast iron to obtain a high damping coefficient and high inherent resonant frequency. A multi-level aspheric curve generator is designed according to the multi-level aspheric curve equation to easily create an aspheric curve and then rotated into an aspheric surface form with a symmetrical optical axis. The verifications of the designed bench machine tool’s functions were conducted by machining the micro aspheric lighting-lens molds using highspeed micro milling. Experimental results demonstrate that form accuracy and surface roughness for the micro aspheric lightinglens mold of Rt 2.937 μm and Ra equal to 0.032 μm respectively could be simultaneously achieved. The developed cost-effective bench machine tool can supply high-quality and fast machining in the fabrication of micro optoelectronic molds such as those used for micro aspheric lighting-lenses.