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Search Results: 1 - 10 of 48614 matches for " Chao-Lin Kuo "
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Calibration of the Camera Used in a Questionnaire Input System by Computer Vision
Yong-Ren Pu,Su-Hsing Lee,Chao-Lin Kuo
Information Technology Journal , 2011,
Abstract: Quantitative information collection is important for scholars using questionnaires, since the number of administered questionnaires in a major survey is usually quite large. To develop an automatic and vast input method for questionnaires by computer vision, the authors adopt the perspective projection model in the image processing. This study presents a method to calibrate the camera used in the framework of this questionnaire input system. The distortions of the questionnaire image are derived therein so that the system is able to locate all checkboxes accurately. The computer software is coded with a visual programming language and is developed to extract the interiors of all checkboxes by seeking their edges. The experiment is designed, by reducing the errors produced by the recognized centers of some designated checkboxes, to determine the optimal values of various focal lengths to the image plane.
Design of Variable Structure Synchronization Controller for Two Different Hyperchaotic Systems Containing Nonlinear Inputs
Chao-Lin Kuo,Cheng-Chi Wang,Neng-Sheng Pai
Journal of Applied Sciences , 2009,
Abstract: This study introduces a variable structure technology for the synchronization of chaos between two different hyperchaotic systems with input nonlinearity. Based on Lyapunov stability theory, a sliding mode controller and some generic sufficient conditions for global asymptotic synchronization are designed such that the error dynamics of the hyperchaotic R ssler and hyperchaotic Chen systems satisfy stability in the Lyapunov sense in spit of the input nonlinearity. The numerical simulation results demonstrate the validity and feasibility of the proposed controller.
Cosmic Microwave Background Delensing Revisited: Residual Biases and a Simple Fix
Wei-Hsiang Teng,Chao-Lin Kuo,Jiun-Huei Proty Wu
Physics , 2011,
Abstract: The delensing procedure is an effective tool for removing lensing-induced $B$-mode polarization in the Cosmic Microwave Background to allow for deep searches of primordial $B$-modes. However, the delensing algorithm existing in the literature breaks down if the target $B$-mode signals overlap significantly with the lensing $B$-mode ($\sim 300
Chemical Constituents from the Stems of Diospyros maritima
Chi-I Chang,Chiy-Rong Chen,Hsi-Lin Chiu,Chao-Lin Kuo,Yueh-Hsiung Kuo
Molecules , 2009, DOI: 10.3390/molecules14125281
Abstract: A new phenolic, bis(6-hydroxy-2,3,4-trimethoxylphen-1-yl)methane (1) and a new butanedioate, butylmethyl succinate (2), along with twenty-nine known compounds including one naphthoquinone derivative, two chromanones, eight benzenoids, one lignan, one tocopherol, and sixteen triterpenoids were isolated from the stems of Diospyros maritima. epi-Isoshinanolone (3) was isolated in pure form for the first time. In addition, 5,7-dihydroxy-2-methylchomanone (4) was isolated from a natural source for the first time. Their structures were established on the basis of spectroscopic data as well as direct comparison with authentic samples.
The Hypouricemic Effect of Balanophora laxiflora Extracts and Derived Phytochemicals in Hyperuricemic Mice
Shang-Tse Ho,Yu-Tang Tung,Chi-Chang Huang,Chao-Lin Kuo,Chi-Chen Lin,Suh-Ching Yang,Jyh-Horng Wu
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/910152
Abstract: The objective of this study is to evaluate the lowering of uric acid using Balanophora laxiflora extracts and derived phytochemicals on potassium-oxonate-(PO-) induced hyperuricemia in mice. The results revealed that ethyl acetate (EtOAc) fraction of B. laxiflora extracts exhibited strong xanthine-oxidase-(XOD-) inhibitory activity. In addition, among the 10 subfractions (EA1–10) derived from EtOAc fraction, subfraction 8 (EA8) exhibited the best XOD-inhibitory activity. Four specific phytochemicals, 1-O-(E)-caffeoyl-β-D-glucopyranose (1), 1-O-(E)-p-coumaroyl-β-D-glucopyranose (2), 1,3-di-O-galloyl-4,6-(S)-hexahydroxydiphenoyl-β-D-glucopyranose (3), and 1-O-(E)-caffeoyl-4,6-(S)-hexahydroxydiphenoyl-β-D-glucopyranose (4), were further isolated and identified from this subfraction. Compounds 3 and 4 exhibited the strongest XOD-inhibitory activity compared with other compounds, and both hydrolyzable tannins were determined to be noncompetitive inhibitors according to the Lineweaver-Burk plot. On the other hand, the in vivo hypouricemic effect in hyperuricemic mice was consistent with XOD-inhibitory activity, indicating that B. laxiflora extracts and derived phytochemicals could be potential candidates as new hypouricemic agents.
New Anti-Inflammatory and Anti-Proliferative Constituents from Fermented Red Mold Rice Monascus purpureus NTU 568
Ya-Wen Hsu,Li-Chuan Hsu,Chao-Lin Chang,Yu-Han Liang,Yao-Haur Kuo,Tzu-Ming Pan
Molecules , 2010, DOI: 10.3390/molecules15117815
Abstract: Six azaphilonoid derivatives, including two new blue fluorescent monapurfluores A (1) and B (2), two known pyridine-containing molecules, monascopyridines C (3) and D (4), and two known monasfluores A (5) and B (6), were isolated and characterized from red mold rice fermented by Monascus purpureus NTU 568. Structural elucidation of new isolates was based on nuclear magnetic resonance (1H- NMR, 13C-NMR, COSY, HMQC, and HMBC) and other spectroscopic analyses. Bioactivity evaluation indicated that 1-6 possessed anti-inflammatory activities with dose-dependent relationships for lipopolysaccharide (LPS)-induced nitric oxide production. Furthermore, 1-4 also showed moderate antiproliferative effects against human laryngeal carcinoma (HEp-2) (IC50 = 14.81~20.06 μg/mL) and human colon adenocarcinoma (WiDr) (IC50 = 12.89~21.14 μg/mL).
State-space Abstraction for Anytime Evaluation of Probabilistic Networks
Michael P. Wellman,Chao-Lin Liu
Computer Science , 2013,
Abstract: One important factor determining the computational complexity of evaluating a probabilistic network is the cardinality of the state spaces of the nodes. By varying the granularity of the state spaces, one can trade off accuracy in the result for computational efficiency. We present an anytime procedure for approximate evaluation of probabilistic networks based on this idea. On application to some simple networks, the procedure exhibits a smooth improvement in approximation quality as computation time increases. This suggests that state-space abstraction is one more useful control parameter for designing real-time probabilistic reasoners.
Using Qualitative Relationships for Bounding Probability Distributions
Chao-Lin Liu,Michael P. Wellman
Computer Science , 2013,
Abstract: We exploit qualitative probabilistic relationships among variables for computing bounds of conditional probability distributions of interest in Bayesian networks. Using the signs of qualitative relationships, we can implement abstraction operations that are guaranteed to bound the distributions of interest in the desired direction. By evaluating incrementally improved approximate networks, our algorithm obtains monotonically tightening bounds that converge to exact distributions. For supermodular utility functions, the tightening bounds monotonically reduce the set of admissible decision alternatives as well.
Incremental Tradeoff Resolution in Qualitative Probabilistic Networks
Chao-Lin Liu,Michael P. Wellman
Computer Science , 2013,
Abstract: Qualitative probabilistic reasoning in a Bayesian network often reveals tradeoffs: relationships that are ambiguous due to competing qualitative influences. We present two techniques that combine qualitative and numeric probabilistic reasoning to resolve such tradeoffs, inferring the qualitative relationship between nodes in a Bayesian network. The first approach incrementally marginalizes nodes that contribute to the ambiguous qualitative relationships. The second approach evaluates approximate Bayesian networks for bounds of probability distributions, and uses these bounds to determinate qualitative relationships in question. This approach is also incremental in that the algorithm refines the state spaces of random variables for tighter bounds until the qualitative relationships are resolved. Both approaches provide systematic methods for tradeoff resolution at potentially lower computational cost than application of purely numeric methods.
Cytotoxic Phenylpropanoids and a New Triterpene, Turformosinic Acid, from Turpinia formosana Nakai
Hui-Chi Huang,Chun-Tang Chiou,Ping-Chun Hsiao,Chia-Ching Liaw,Li-Jie Zhang,Chao-Lin Chang,Ih-Sheng Chen,Wen-Chi Chen,Kuo-Hsiung Lee,Yao-Haur Kuo
Molecules , 2012, DOI: 10.3390/molecules17021837
Abstract: One new phenylpropanoid, turformosin A (1), and one new triterpene, turformosinic acid (2), together with 16 known compounds, were isolated from the stems of Turpinia formosana Nakai. All structures were elucidated on the basis of spectroscopic analysis, including 1D- and 2D-NMR techniques and MS analysis. Selected isolated compounds were evaluated for in vitro cytotoxicity against four human cancer cell lines and antioxidant scavenging effects on DPPH. (?)-(7′S,8′S)-threo-carolignan X (3) exhibited cytotoxicity against Hep2, WiDr, Daoy, and MCF-7 cell lines with ED50 values of 3.60, 4.45, 6.07, and 13.7 μg/mL, respectively. Turformosin A (1), (?)-(7′S,8′S)- threo-carolignan X (3), methoxyhydroquinone-4-β-d-glucopyranoside (5), and methoxy-hydroquinone-1-β-d-glucopyranoside (6), exhibited similar anti-oxidative activity. Hep2 cells treated with 10 μg/mL of 3 showed elevation of sub-G1 population (from 20% at 8 h to 60% at 48 h), and activation of caspase-9/caspase-3/PARP cascade. Compound 3 induced intrinsic apoptotic pathway in Hep2 cells with dose and time dependence (10 μg/mL for 8 h).
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