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Search Results: 1 - 10 of 191717 matches for " H. Y. Liao "
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Production and Decay of the Ge73-m Metastable State in a Low-Background Germanium Detector
TEXONO Collaboration,H. Y. Liao
Physics , 2008, DOI: 10.1088/0954-3899/35/7/077001
Abstract: The $\ge73m$ metastable states decay with a very characteristic signature which allow them to be tagged event-by-event. Studies were performed using data taken with a high-purity germanium detector in a low-background laboratory near a nuclear power reactor core where $\nuebar$-flux was $\rm{6.4 \times 10^{12} ~ cm^{-2} s^{-1}}$. The measured average and equilibrium production rates of $\ge73m$ were $\rm{(8.7 \pm 0.4)}$ and $\rm{(6.7 \pm 0.3) ~ kg^{-1} day^{-1}}$, respectively. The production channels were studied and identified. By studying the difference in the production of $\ge73m$ between the reactor ON and OFF spectra, the limiting sensitivities at the range of $\rm{\sim 10^{-42} - 10^{-43} ~ cm^2}$ for the cross-sections of neutrino-induced nuclear transitions were derived. The dominant background are due to $\beta$-decays of cosmic-ray induced $^{73}$Ga. The prospects of enhancing the sensitivities at underground locations are discussed.
Applying PCA and Fixed Size LS-SVM Method for Large Scale Classification Problems
Y.H. Hung,Y.S. Liao
Information Technology Journal , 2008,
Abstract: In data mining, machine learning application is widely discussed and studied. Purpose of using machine learning method to study classification is to attempt to assist related personnel in decision-making. Success of machine learning lies in its classification accuracy and stability, thus improving classification accuracy and stability becomes hot topic of researchers. Support Vector Machine is an excellent tool at high accuracy rate of classification and prediction, but lacking the confidence at analyzing highly complex data. This study utilized Principal Component Analysis (PCA) and Fixed Size (FS) algorithm to reduce data freedom degree and delete data noise and find critical support vector to improve Least Squares Support Vector Machine (LS-SVM) classification accuracy. This study tested four UCI libraries. From experimental result of highly complex PIDD library, classification accuracy of two-stage PCA_FS_LS-SVM approach is 3.23% higher than single LS-SVM. With the application of FS_LS-SVM algorithms, UCI datasets classification systems can produce classification accuracies above 96%.
A New Calibration Method and its Application for the Cooperation of Wide-Angle and Pan-Tilt-Zoom Cameras
H.C. Liao,Y.C. Cho
Information Technology Journal , 2008,
Abstract: In this study, we present a new calibration method for the cooperation of wide-angle and Pan-Tilt-Zoom (PTZ) cameras. A wide-angle camera enables the surveillance of a large area. However, it may be difficult to perceive the detail of an object. On the other hand, a PTZ camera enables the surveillance of the object detail. However, its view is limited when the camera zooms on a specific object. Therefore, the cooperation can complement the disadvantage of two types of cameras. For an object appears in the image of wide-angle camera, the desired pan and tilt angles of a PTZ camera for focusing on the object can be computed from its image coordinate. Earlier methods can be classified into three categories: 3D world coordinate system, scene-dependent, or special technique. They are not simple and instinctive enough. The proposed method is simply based on the 2D image plane of wide-angle camera. A set of calibration points are selected directly on the image. Every point is a pair of pan/tilt angles (p, t) and 2D coordinate (x, y). Then, the calibration parameters are calculated from the set of points. An experiment was designed to evaluate the accuracy of the proposed method at fixed points. The results show that the proposed method is accurate enough for the cooperation of dual cameras. In advance, a prototype system for capturing close-up images of moving objects in an open area was implemented to demonstrate the feasibility of the proposed method.
From the chiral magnetic wave to the charge dependence of elliptic flow
Y. Burnier,D. E. Kharzeev,J. Liao,H. -U. Yee
Physics , 2012,
Abstract: The quark-gluon plasma formed in heavy ion collisions contains charged chiral fermions evolving in an external magnetic field. At finite density of electric charge or baryon number (resulting either from nuclear stopping or from fluctuations), the triangle anomaly induces in the plasma the Chiral Magnetic Wave (CMW). The CMW first induces a separation of the right and left chiral charges along the magnetic field; the resulting dipolar axial charge density in turn induces the oppositely directed vector charge currents leading to an electric quadrupole moment of the quark-gluon plasma. Boosted by the strong collective flow, the electric quadrupole moment translates into the charge dependence of the elliptic flow coefficients, so that $v_2(\pi^+) < v_2(\pi^-)$ (at positive net charge). Using the latest quantitative simulations of the produced magnetic field and solving the CMW equation, we make further quantitative estimates of the produced $v_2$ splitting and its centrality dependence. We compare the results with the available experimental data.
Prostate stem cell antigen-targeted nanoparticles with dual functional properties: in vivo imaging and cancer chemotherapy
Gao X, Luo Y, Wang Y, Pang J, Liao C, Lu H, Fang Y
International Journal of Nanomedicine , 2012, DOI: http://dx.doi.org/10.2147/IJN.S32804
Abstract: ostate stem cell antigen-targeted nanoparticles with dual functional properties: in vivo imaging and cancer chemotherapy Original Research (2814) Total Article Views Authors: Gao X, Luo Y, Wang Y, Pang J, Liao C, Lu H, Fang Y Published Date July 2012 Volume 2012:7 Pages 4037 - 4051 DOI: http://dx.doi.org/10.2147/IJN.S32804 Received: 10 April 2012 Accepted: 17 May 2012 Published: 30 July 2012 Xin Gao,1,* Yun Luo,1,* Yuanyuan Wang,1,* Jun Pang,1 Chengde Liao,2 Hanlun Lu,3 Youqiang Fang1 1Department of Urology, The Third Affiliated Hospital, 2Department of Radiology, The Second Affiliated Hospital, Sun Yat-Sen University, 3Materials Science Institute of Zhongshan University, Guangzhou, China *These authors contributed equally to this work Background: We designed dual-functional nanoparticles for in vivo application using a modified electrostatic and covalent layer-by-layer assembly strategy to address the challenge of assessment and treatment of hormone-refractory prostate cancer. Methods: Core-shell nanoparticles were formulated by integrating three distinct functional components, ie, a core constituted by poly(D,L-lactic-co-glycolic acid), docetaxel, and hydrophobic superparamagnetic iron oxide nanocrystals (SPIONs), a multilayer shell formed by poly(allylamine hydrochloride) and two different sized poly(ethylene glycol) molecules, and a single-chain prostate stem cell antigen antibody conjugated to the nanoparticle surface for targeted delivery. Results: Drug release profiles indicated that the dual-function nanoparticles had a sustained release pattern over 764 hours, and SPIONs could facilitate the controlled release of the drug in vitro. The nanoparticles showed increased antitumor efficiency and enhanced magnetic resonance imaging in vitro through targeted delivery of docetaxel and SPIONs to PC3M cells. Moreover, in nude mice bearing PC3M xenografts, the nanoparticles provided MRI negative contrast enhancement, as well as halting and even reversing tumor growth during the 76-day study duration, and without significant systemic toxicity. The lifespan of the mice treated with these targeted dual-function nanoparticles was significantly increased (Chi-square = 22.514, P < 0.0001). Conclusion: This dual-function nanomedical platform may be a promising candidate for tumor imaging and targeted delivery of chemotherapeutic agents in vivo.
Gasdynamics in NGC 4736
Q. -S. Gu,X. -H. Liao,J. -H. Huang,Q. -Y. Qu,H. -J. Su
Physics , 1996,
Abstract: New test-particle simulations have been performed to study the secular evolution of the gaseous distribution in NGC 4736. We find that the distribution of gas clouds can be understood in the frame of perturbation induced by a nuclear oval potential, in addition to a spiral-like potential. Our experiments show that both inner and outer rings are stable structures located at the inner Lindblad resonance (ILR) and the outer Lindblad resonance(OLR), respectively, in agreement with the observations of NGC 4736. One of our simplified simulations indicates that both nuclear starburst and orbital resonance might be needed for keeping the inner ring stable for a long period. We have introduced a symplectic algorithm in the orbit integration. Its stronger stability allows us to adopt a rather large time step to save computational time. Substitution of a viscous force for cloud-cloud interactions proves adequate in the case of NGC 4736.
Nanoparticles prepared from the water extract of Gusuibu (Drynaria fortunei J. Sm.) protects osteoblasts against insults and promotes cell maturation
Hsu C-K,Liao M-H,Tai Y-T,Liu S-H
International Journal of Nanomedicine , 2011,
Abstract: Chung-King Hsu1,2, Mei-Hsiu Liao3, Yu-Tyng Tai4, Shing-Hwa Liu5, Keng-Liang Ou6, Hsu-Wei Fang7, I-Jung Lee8, Ruei-Ming Chen2,31Institute of Materials Science and Engineering, National Taipei University of Technology, 2Cell Physiology and Molecular Image Research Center, Taipei Medical University-Wan Fang Medical Center, 3Graduate Institute of Medical Sciences, Taipei Medical University, 4Department of Anesthesiology, Taipei Medical University-Wan Fang Medical Center, 5Institute of Toxicology, College of Medicine, National Taiwan University, 6Graduate Institute of Biomedical Materials and Engineering, Taipei Medical University, 7Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 8Division of Information and Herbarium, National Research Institute of Chinese Medicine, Taipei, TaiwanAbstract: Our previous study showed that Gusuibu (Drynaria fortunei J. Sm.) can stimulate osteoblast maturation. This study was further designed to evaluate the effects of nanoparticles prepared from the water extract of Gusuibu (WEG) on osteoblast survival and maturation. Primary osteoblasts were exposed to 1, 10, 100, and 1000 μg/mL nanoparticles of WEG (nWEG) for 24, 48, and 72 hours did not affect morphologies, viability, or apoptosis of osteoblasts. In comparison, treatment of osteoblasts with 1000 μg/mL WEG for 72 hours decreased cell viability and induced DNA fragmentation and cell apoptosis. nWEG had better antioxidant bioactivity in protecting osteoblasts from oxidative and nitrosative stress-induced apoptosis than WEG. In addition, nWEG stimulated greater osteoblast maturation than did WEG. Therefore, this study shows that WEG nanoparticles are safer to primary osteoblasts than are normal-sized products, and may promote better bone healing by protecting osteoblasts from apoptotic insults, and by promoting osteogenic maturation.Keywords: Gusuibu, nanoparticles, cell protection, osteoblast maturation
A novel route to phase formation of cobalt oxyhydrates using KMnO4 as an oxidizing agent
C. -J. Liu,C. -Y. Liao,L. -C. Huang,C. -H. Su,S. Neeleshwar,Y. -Y. Chen
Physics , 2004, DOI: 10.1016/j.physc.2004.09.005
Abstract: We have first succeefully synthesized the sodium cobalt oxyhydrate superconductors using KMnO4 as a de-intercalating and oxidizing agent. It is a novel route to form the superconductive phase of NaxCoO2.yH2O without resorting to the commonly used Br2/CH3CN solution. The role of the KMnO4 is to de-intercalate the Na+ from the parent compound Na0.7CoO2 and oxidize the Co ion as a result. The higher molar ratio of KMnO4 relative to the sodium content tends to remove more Na+ from the parent compound and results in a slight expansion of the c-axis in the unit cell. The superconducting transition temperature is 4.6-3.8 K for samples treated by the aqueous KMnO4 solution with the molar ratio of KMnO4 relative to the sodium content in the range of 0.3 and 2.29.
Quantum coherence in ultrastrong optomechanics
D. Hu,S. -Y. Huang,J. -Q. Liao,L. Tian,H. -S. Goan
Physics , 2014, DOI: 10.1103/PhysRevA.91.013812
Abstract: Ultrastrong light-matter interaction in an optomechanical system can result in nonlinear optical effects such as photon blockade. The system-bath couplings in such systems play an essential role in observing these effects. Here we study the quantum coherence of an optomechanical system with a dressed-state master equation approach. Our master equation includes photon-number-dependent terms that induce dephasing in this system. Cavity dephasing, second-order photon correlation, and two-cavity entanglement are studied with the dressed-state master equation.
Formal Semantic Annotations for Models Interoperability in a PLM environment
Y. Liao,M. Lezoche,H. Panetto,N. Boudjlida,Eduardo Rocha Loures
Computer Science , 2014, DOI: 10.3182/20140824-6-ZA-1003.02551
Abstract: Nowadays, the need for system interoperability in or across enterprises has become more and more ubiquitous. Lots of research works have been carried out in the information exchange, transformation, discovery and reuse. One of the main challenges in these researches is to overcome the semantic heterogeneity between enterprise applications along the lifecycle of a product. As a possible solution to assist the semantic interoperability, semantic annotation has gained more and more attentions and is widely used in different domains. In this paper, based on the investigation of the context and the related works, we identify some existing drawbacks and propose a formal semantic annotation approach to support the semantics enrichment of models in a PLM environment.
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