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Search Results: 1 - 10 of 393957 matches for " Cecilia W. P. Li-Tsang "
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The Effect of a Visual Memory Training Program on Chinese Handwriting Performance of Primary School Students with Dyslexia in Hong Kong  [PDF]
Cecilia W. P. Li-Tsang, Agnes S. K. Wong, Linda F. L. Tse, Hebe Y. H. Lam, Viola H. L. Pang, Cathy Y. F. Kwok, Maggie W. S. Lin
Open Journal of Therapy and Rehabilitation (OJTR) , 2015, DOI: 10.4236/ojtr.2015.34020
Abstract: This study investigated the effect of a visual memory training program on Chinese handwriting performance among primary school students with dyslexia in Hong Kong. Eight students of Grade 2 to 3 who were diagnosed with dyslexia were recruited. All participants received six sessions of training, which composed of 30-minute computerized game-based visual memory training and 30-minute Chinese character segmentation training. Visual perceptual skills and Chinese handwriting performance were assessed before and after the training, as well as three weeks after training using the Test of Visual Perceptual Skills (3rd edition) (TVPS-3) and the Chinese Handwriting Analysis System (CHAS). In comparing the pre- and post-training results, paired t-tests revealed significant improvements in visual memory skills, as well as handwriting speed, pause time and pen pressure after the training. There was no significant improvement in handwriting accuracy or legibility. The improved visual memory and handwriting performance did not show a significant drop at the follow-up assessments. This study showed promising results on a structured program to improve the Chinese handwriting performance, mainly in speed, of primary school children. The improvements appeared to be well-sustained after the training program. There is a need to further study the long-term effect of the program through a randomized controlled trial study.
Effects of a Single-Dose of Mind-Body Practice on the Heart Rate Variability, Brain Activity and Shooting Performance in Archers: A Pilot Study  [PDF]
Peter X. L. Li, Chung S. C. Chan, Kenneth K. Y. Lai, Jennifer P. C. Wong, William W. N. Tsang
Yangtze Medicine (YM) , 2019, DOI: 10.4236/ym.2019.32012
Abstract: Objective: Factors affecting performance of archery are categorized into psychological, skill, and fitness perspectives. Increase in attention, relaxation and parasympathetic system activity is believed to enhance the shooting performance of archers during competition. This pilot study aims to investigate the effects of single-dose of Tai Chi practice on archer’s performance and the feasibility of an investigation protocol under a competition scenario. Methods: This was a randomized controlled trial (RCT) with a crossover study design. Pre- and post-intervention measurements were conducted to evaluate the effects of Tai Chi practice on the archer’s autonomic nervous system activity, attention and relaxation through electroencephalography investigation, and shooting performance when compared with stretching as control. Results: The protocol of the study was found to be feasible during a competition setting. No significant difference was detected in the outcome measures under the two intervention conditions. Participants after practicing Tai Chi were found to improve significantly in their shooting performance (p = 0.021). Conclusion: This pilot study showed that a real-time measurement of autonomic nervous system and brain wave activities in the competition field was feasible and it did not hinder the archers’ performance. There was a significant improvement observed in the shooting performance of archers after Tai Chi practice when compared with baseline. The findings of this pilot study provide the basis for the conduction of a larger RCT study to examine the potential beneficial effects of Tai Chi practice on archers.
Probing the density dependence of symmetry energy at subsaturation density with HICs
Yingxun Zhang,M. B. Tsang,Zhuxia Li,P. Danielewicz,W. G. Lynch,Xiaohua Lu
Physics , 2009, DOI: 10.1142/S0218301310016053
Abstract: The reaction mechanism of the central collisions and peripheral collisions for $^{112,124}Sn+^{112,124}Sn$ at $E/A=50MeV$ is investigated within the framework of the Improved Quantum Molecular Dynamics model. The results show that multifragmentation process is an important mechanism at this energy region, and the influence of the cluster emission on the double n/p ratios and the isospin transport ratio are important. Furthermore, three observables, double n/p ratios, isospin diffusion and the rapidity distribution of the ratio $R_{7}$ for $^{112,124}Sn+^{112,124}Sn$ at E/A=50MeV are analyzed with the Improved Quantum Molecular Dynamics model. The results show that these three observables are sensitive to the density dependence of the symmetry energy. By comparing the calculation results to the data, the consistent constraint on the density dependence of the symmetry energy from these three observables is obtained.
The influence of cluster emission and the symmetry energy on neutron-proton spectral double ratios
Y. X. Zhang,P. Danielewicz,M. Famiano,Z. Li,W. G. Lynch,M. B. Tsang
Physics , 2007, DOI: 10.1016/j.physletb.2008.03.075
Abstract: Emissions of free neutrons and protons from the central collisions of 124Sn+124Sn and 112Sn+112Sn reactions are simulated using the Improved Quantum Molecular Dynamics model with two different density dependence of the symmetry energy in the nuclear equation of state. The constructed double ratios of the neutron to proton ratios of the two reaction systems are found to be sensitive to the symmetry terms in the EOS. The effect of cluster formation is examined and found to affect the double ratios mainly in the low energy region. In order to extract better information on symmetry energy with transport models, it is therefore important to have accurate data in the high energy region which also is affected minimally by sequential decays.
Constraints on the density dependence of the symmetry energy
M. B. Tsang,Yingxun Zhang,P. Danielewicz,M. Famiano,Zhuxia Li,W. G. Lynch,A. W. Steiner
Physics , 2008, DOI: 10.1142/S0218301310016041
Abstract: Collisions involving 112Sn and 124Sn nuclei have been simulated with the improved Quantum Molecular Dynamics transport model. The results of the calculations reproduce isospin diffusion data from two different observables and the ratios of neutron and proton spectra. By comparing these data to calculations performed over a range of symmetry energies at saturation density and different representations of the density dependence of the symmetry energy, constraints on the density dependence of the symmetry energy at sub-normal density are obtained. Results from present work are compared to constraints put forward in other recent analysis.
Probing the Symmetry Energy with Heavy Ions
W. G. Lynch,M. B. Tsang,Y. Zhang,P. Danielewicz,M. Famiano,Z. Li,A. W. Steiner
Physics , 2009, DOI: 10.1016/j.ppnp.2009.01.001
Abstract: Constraints on the EoS for symmetric matter (equal neutron and proton numbers) at supra-saturation densities have been extracted from energetic collisions of heavy ions. Collisions of neutron-deficient and neutron-rich heavy ions now provide initial constraints on the EoS of neutron-rich matter at sub-saturation densities. Comparisons are made to other available constraints.
The Influence of in-medium NN cross-sections, symmetry potential and impact parameter on the isospin observables
Yingxun Zhang,D. D. S. Coupland,P. Danielewicz,Zhuxia Li,Hang Liu,Fei Lu,W. G. Lynch,M. B. Tsang
Physics , 2010, DOI: 10.1103/PhysRevC.85.024602
Abstract: We explore the influence of in-medium nucleon-nucleon cross section, symmetry potential and impact parameter on isospin sensitive observables in intermediate-energy heavy-ion collisions with the ImQMD05 code, a modified version of Quantum Molecular Dynamics model. At incident velocities above the Fermi velocity, we find that the density dependence of symmetry potential plays a more important role on the double neutron to proton ratio $DR(n/p)$ and the isospin transport ratio $R_i$ than the in-medium nucleon-nucleon cross sections, provided that the latter are constrained to a fixed total NN collision rate. We also explore both $DR(n/p)$ and $R_i$ as a function of the impact parameter. Since the copious production of intermediate mass fragments is a distinguishing feature of intermediate-energy heavy-ion collisions, we examine the isospin transport ratios constructed from different groups of fragments. We find that the values of the isospin transport ratios for projectile rapidity fragments with $Z\ge20$ are greater than those constructed from the entire projectile rapidity source. We believe experimental investigations of this phenomenon can be performed. These may provide significant tests of fragmentation time scales predicted by ImQMD calculations.
Matching Pursuit LASSO Part II: Applications and Sparse Recovery over Batch Signals
Mingkui Tan,Ivor W. Tsang,Li Wang
Computer Science , 2013,
Abstract: Matching Pursuit LASSIn Part I \cite{TanPMLPart1}, a Matching Pursuit LASSO ({MPL}) algorithm has been presented for solving large-scale sparse recovery (SR) problems. In this paper, we present a subspace search to further improve the performance of MPL, and then continue to address another major challenge of SR -- batch SR with many signals, a consideration which is absent from most of previous $\ell_1$-norm methods. As a result, a batch-mode {MPL} is developed to vastly speed up sparse recovery of many signals simultaneously. Comprehensive numerical experiments on compressive sensing and face recognition tasks demonstrate the superior performance of MPL and BMPL over other methods considered in this paper, in terms of sparse recovery ability and efficiency. In particular, BMPL is up to 400 times faster than existing $\ell_1$-norm methods considered to be state-of-the-art.O Part II: Applications and Sparse Recovery over Batch Signals
Towards Large-scale and Ultrahigh Dimensional Feature Selection via Feature Generation
Mingkui Tan,Ivor W. Tsang,Li Wang
Computer Science , 2012,
Abstract: In many real-world applications such as text mining, it is desirable to select the most relevant features or variables to improve the generalization ability, or to provide a better interpretation of the prediction models. {In this paper, a novel adaptive feature scaling (AFS) scheme is proposed by introducing a feature scaling {vector $\d \in [0, 1]^m$} to alleviate the bias problem brought by the scaling bias of the diverse features.} By reformulating the resultant AFS model to semi-infinite programming problem, a novel feature generating method is presented to identify the most relevant features for classification problems. In contrast to the traditional feature selection methods, the new formulation has the advantage of solving extremely high-dimensional and large-scale problems. With an exact solution to the worst-case analysis in the identification of relevant features, the proposed feature generating scheme converges globally. More importantly, the proposed scheme facilitates the group selection with or without special structures. Comprehensive experiments on a wide range of synthetic and real-world datasets demonstrate that the proposed method {achieves} better or competitive performance compared with the existing methods on (group) feature selection in terms of generalization performance and training efficiency. The C++ and MATLAB implementations of our algorithm can be available at \emph{http://c2inet.sce.ntu.edu.sg/Mingkui/robust-FGM.rar}.
Fragment Isotope Distributions and the Isospin Dependent Equation of State
W. P. Tan,B-A. Li,R. Donangelo,C. K. Gelbke,M-J. van Goetherm,X. D. Liu,W. G. Lynch,S. Souza,M. B. Tsang,G. Verde,A. Wagner,N. S. Xu
Physics , 2001, DOI: 10.1103/PhysRevC.64.051901
Abstract: Calculations predict a connection between the isotopic composition of particles emitted during an energetic nucleus-nucleus collision and the density dependence of the asymmetry term of the nuclear equation of state (EOS). This connection is investigated for central 112Sn+112Sn and 124Sn+124Sn collisions at E/A=50 MeV in the limit of an equilibrated freezeout condition. Comparisons between measured isotopic yields ratios and theoretical predictions in the equilibrium limit are used to assess the sensitivity to the density dependence of the asymmetry term of the EOS. This analysis suggests that such comparisons may provide an opportunity to constrain the asymmetry term of the EOS.
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