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Object Recognition Based on Modified Intuitive Corner Detection and Two-stage CornerMatching
Chin Sheng Chen,Ming Fu Tsai,Chun Chan Chiu 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes an object recognition algorithm based on modified intuitive corner detection and two-stage corner matching. The object recognition algorithm consists of two phases: the off-line training phase and the on-line operating phase. The critical purpose is to construct template database in the training phase. Firstly, the corners are extracted from the template image by the modified intuitive corner detection. The multi-resolution patches are then applied to create the full scale corners’ features. Each corner has its own descriptor based on SIFT and PCA. With this information, the algorithm creates the hierarchical structures of multi-resolution patches to improve the speed of corner matching. In the operating phase, the test images are processed in the same manner mentioned above with single resolution patches, and then the corner will be matched with the multi-resolution patches in the training phase’s database. The two-stage corner matching, coarse and fine matching based on hierarchical structures of corner descriptions appears to reduce the range of patch’s candidates, is then adopted toimprove the matching performance. Finally, the Random sample consensus (RANSAC) criterion is applied to reject the remaining outlier. Experimental results show that our proposed object recognition is reliable and real-time.
Design and simulation of self-tuning PI-type temperature control for an injection molding machine
Chin Sheng Chen,Yen Ting Chen 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A Proportional-Integral (PI) controller is a typical controller in industry application. For control engineer, it isimportant to find out the optimal PI parameters by observing system response when system model is difficult to identifycorrectly. However, this task is time consuming and boring. This paper proposes a self-tuning methodology with a Gradient Bisection Algorithm (GBA) to find the optimal PI parameters based on the cost function of integral absolute error (IAE) and the design indexes. The control plant for this paper is barrel temperature control of injection moldingmachine with uncertain model. Finally, the simulation results show that our proposed algorithms can dramaticallyreduce the tuning time and control response can achieve the specified performance.
Chin-Sheng Chen,Si-Yu Lin 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
The environmental conditions corresponding to dangerous or collided areas are generally represented by Costmap when the Autonomous Mobile Robot (AMR) is navigated. Here, this paper provides a Costmap 2D layer plugin, Velocity Obstacle layer, it can accurately detect obstacle’s coordination and radius and then estimate the obstacle’s velocity to create Velocity Obstacle which can represent the potential collision vector in the future. In the simulation, we assume the robot’s max velocity is 0.2m/s and an obstacle move forward to the robot with 0.3m/s. The results show the AMR can avoid the obstacle well. In experiment, the AMR also can avoid the people moving toward it in the real world.
Self-tuning Fuzzy PI Control for Laser Power Stabilization
Chin-Sheng Chen,Bo-Ming Chiu,Chien-Hsu Chen 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper proposes a self-tuning fuzzy PI controller to stabilize the laser power. The laser system is a nonlinear system due to its complexity and easily affected by environment conditions. However, traditional PI controller cannot cope with this nonlinear and time varying system since the parameters of PI controller are fixed. This paper utilizes the fuzzy reasoning engine (FRE) to adjust the parameters of PI controller in order to overcome the above drawbacks. This control algorithm is implemented in Microchip dsPIC33FJ64GS606 microprocessor. The experimental results verify our proposed control algorithm can dramatically stabilize the laser output power and further improve the tracking performance when laser desired power command is changed.
Po-Wei Lee,Tzu-Yun Wang,Yun-Hsuan Chang,Sheng-Yu Lee,Shiou-Lan Chen,Ze-Cheng Wang,Po See Chen,Chun-Hsien Chu,San-Yuan Huang,Nian-Sheng Tzeng,I Hui Lee,Kao Chin Chen,Yen Kuang Yang,Jau-Shyong Hong,Ru-B 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.1
Objective: Patients with opioid use disorder (OUD) have impaired attention, inhibition control, and memory function. The aldehyde dehydrogenase 2 (ALDH2 ) gene has been associated with OUD and ALDH2 gene polymorphisms may affect aldehyde metabolism and cognitive function in other substance use disorder. Therefore, we aimed to investigate whether ALDH2 genotypes have significant effects on neuropsychological functions in OUD patients undergoing methadone maintenance therapy (MMT). Methods: OUD patients undergoing MMT were investigated and followed-up for 12 weeks. ALDH2 gene polymorphisms were genotyped. Connors’ Continuous Performance Test (CPT) and the Wechsler Memory Scale-Revised (WMS-R) were administered at baseline and after 12 weeks of MMT. Multivariate linear regressions and generalized estimating equations (GEEs) were used to examine the correlation between the ALDH2 genotypes and performance on the CPTs and WMS-R. Results: We enrolled 86 patients at baseline; 61 patients completed the end-of-study assessments. The GEE analysis showed that, after the 12 weeks of MMT, OUD patients with the ALDH2 *1/*2+*2/*2 (ALDH2 inactive) genotypes had significantly higher commission error T-scores (p = 0.03), significantly lower hit reaction time T-scores (p = 0.04), and significantly lower WMS-R visual memory index scores (p = 0.03) than did patients with the ALDH2 1 */*1 (ALDH2 active) genotype. Conclusion: OUD patients with the ALDH2 inactive genotypes performed worse in cognitive domains of attention, impulse control, and memory than did those with the ALDH2 active genotype. We conclude that the ALDH2 gene is important in OUD and is associated with neuropsychological performance after MMT.
Fabrication of a Pb-Sn Nanowire Array Gas Sensor Using a Novel High Vacuum Die Casting Technique
Chin-Guo Kuo,Ho Chang,Lih-Ren Hwang,Shu Hor,Jia-Shin Chen,Guo-yan Liu,Sheng-Cheng Cheng 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
In this study, an anodic aluminum oxide nanomold was obtained by etching on an aluminum substrate at a purity of 99.7% with an oxalic acid electrolyte. After etching, a nanomold was prepared with pores that were measured at 80 nm in diameter. This nanomold was used as a base. Using the vacuum casting method,the Pb-Sn alloy was die-cast into the nanomold and consequently shaped into a Pb-Sn alloy nanowire of 80 nm in diameter and 50 μm in length. After solidification, a Pb-Sn nanowire array was obtained. The array of Pb-Sn nanowires prepared in this study can be applied to a gas sensor. Microstructural analysis of the AAO nanomold and the Pb-Sn nanowire array are performed by SEM and XRD.
Chin-Sheng Huang,Su-Wen Kuo,Chia-Cheng Chen 한국증권학회 2010 Asia-Pacific Journal of Financial Studies Vol.39 No.4
The minimum price variation on the Taiwan Stock Exchange reduced for most price categories on March 1, 2005. The present paper simultaneously examines the institutional and endogenous impacts of tick size changes on transaction costs, market liquidity, and trading activity. The empirical evidence suggests that following a reduction in tick size, uniform declines are discernible in transaction costs and market liquidity. In particular, those stocks with a larger relative tick size reduction, higher trading volume, and higher order handling cost components have greater reductions in spread and market depth. Moreover, endogenous tick size reductions have an adverse effect on the trading activity for low-price stocks, due to the relative disadvantage in explicit transaction costs. Finally, the present study observes a general diminution in trade size resulting from a reduction in tick size in the Taiwan Stock Exchange. This study attributes plausible rationales to the fact that after tick size reductions, informed traders employ a smaller trade size to hide private information, or front-runners place a smaller trade size to avoid market turbulence.
Te-Sheng Chang,Chin-Tsun Chen 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.1
The histamine receptor H1 antagonist homochlorcyclizine (HC) has been widely used as an antihistamine agent for the treatment of allergies. However, the effect of HC on skin pigmentation is not known. In the present study, we investigated the inhibitory effect of HC on melanogenesis in mouse B16 melanoma cells. Our results showed that HC inhibited melanogenesis in either α-melanocyte stimulating hormone (α-MSH)- or 3-isobutyl-1-methylxanthin (IBMX)-stimulated B16 cells in a dose-dependent manner. Despite the strong inhibition of melanogenesis by HC, it was surprisingly found that HC did not reduce either cellular or melanosomal tyrosinase activity in α-MSH-stimulated B16 cells. In addition, HC also did not directly inhibit either murine or mushroom tyrosinase activity in the cell-free system. Moreover, western blotting and reverse-transcription polymerase chain reaction (RT-PCR) analyses respectively confirmed that HC did not downregulate levels of tyrosinase protein and its mRNA in α-MSH-stimulated B16 cells. These results clearly demonstrated that HC inhibits melanogenesis of B16 cells by a mechanism other than reduction of the cellular tyrosinase activity. From the present study, HC was proven to be a good candidate as a skin-whitening agent for treatment of skin hyperpigmentation, and this generic drug might be suitable for use in combination with other depigmenting agents due to its unique inhibition mechanism.