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Search Results: 1 - 10 of 39100 matches for " Wen Ting Choi "
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Financial Atoms and Molecules
Yik Wen Goo,Tong Wei Lian,Wei Guang Ong,Wen Ting Choi,Siew-Ann Cheong
Quantitative Finance , 2009,
Abstract: Atoms and molecules are important conceptual entities we invented to understand the physical world around us. The key to their usefulness lies in the organization of nuclear and electronic degrees of freedom into a single dynamical variable whose time evolution we can better imagine. The use of such effective variables in place of the true microscopic variables is possible because of the separation between nuclear/electronic and atomic/molecular time scales. Where separation of time scales occurs, identification of analogous objects in financial markets can help advance our understanding of their dynamics. To detect separated time scales and identify their associated effective degrees of freedom in financial markets, we devised a two-stage statistical clustering scheme to analyze the price movements of stocks in several equity markets. Through this two-time-scale clustering analysis, we discovered a hierarchy of levels of self-organization in real financial markets. We call these statistically robust self-organized dynamical structures financial atoms, financial molecules, and financial supermolecules. In general, the detailed compositions of these dynamical structures cannot be deduced based on raw financial intuition alone, and must be explained in terms of the underlying portfolios, and investment strategies of market players. More interestingly, we find that major market events such as the Chinese Correction and the Subprime Crisis leave many tell-tale signs within the correlational structures of financial molecules.
An Optimal Algorithm for Over-the-Air Reprogramming Protocol in WSNs  [PDF]
Ting WEN, Zhi LI
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12017
Abstract: The over-the-air reprogramming has played an important role in Wireless Sensor Networks (WSNs), and has been widely researched. But the problems of low efficiency and high energy consumption have brought new challenges to the research. This paper presents an optimal algorithm, it is targeted to address the problem of relatively low efficiency and high energy consumption in over-the-air reprogramming in WSNs. Simulation results demonstrate that the optimal algorithm can improve the efficiency of over-the-air reprogramming in WSNs, and make the energy consumption in network not only lower but more balanced.
Research on the Effects, Problems and Strategies of Comprehensive Reform Policy of Private Education in China  [PDF]
Huapeng Dai, Ting Li, Yu Wen
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.210010
Abstract: While the comprehensive reform policies of private education have achieved remarkable results, further reforms are needed to promote the better development of non-governmental education. The research group carried out fieldwork in 25 schools in city X, where the policy implementation, effects of implementation, existing problems and causes were all thoroughly analyzed. The results show that classified management, teachers’ social insurance and government purchase services have been properly implemented. However, limited school autonomy, inequality of payment between teachers of private and public schools, investment and financing difficulties, lack of financial support, and limited land share remain serious problems. Therefore, it is argued that the allocation distribution for public and private schools should be adjusted, the team dynamic of private school teachers should be further strengthened, and schools should be administered independently. It also requires broadening the investment and financing channels, adopting a system of mixed ownership, and developing an innovative system to manage schools. The first step in this process requires following the direction of optimizing the quality of private schools and achieving equalization with public schools. Second, existing mechanisms should be enhanced to link government, department-coordination, grassroots innovation and the participation of the public. Third, according to the specific regional situation, resources should be allocated to promote the formation of mutual development patterns for public and private education in China.
Virtual Simulation Experiment Design under the Guidance of Emotional Design Theory  [PDF]
Ting Lan, Fuan Wen, Meng Huang
Journal of Software Engineering and Applications (JSEA) , 2019, DOI: 10.4236/jsea.2019.123004
Abstract: In recent years, virtual simulation experiments have been widely used in education. However, at present, academic research on virtual simulation experiments mostly focuses on key technologies, and there are few emotional studies on virtual experiments. Based on the three-layer model of emotional design theory, this paper puts forward the method strategy of emotional simulation design in virtual simulation experiment, in order to provide some reference value for the design of virtual simulation experiment.
Temperature Dependence of Current-Voltage Characteristics in Individual Sb2Se3 Nanowire  [PDF]
Kien-Wen Sun, Ting-Yuan Fan
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.11002
Abstract: We demonstrated techniques toward nanoscale thermometries by using a hydrothermally prepared single Sb2Se3 nanowire. Suitable electrodes were fabricated to make electrical contact with a nanowire on a silicon substrate by combining techniques of dielectrophoresis, electron beam (e-beam) lithography, and focused ion beam (FIB). Measurements of temperature-dependent electrical resistivity were carried out from room temperature up to 525 K. The current-voltage characteristics showed linear and symmetric behavior through the entire temperature range, which indicated that the contacts are ohmic. The resistance of the single Sb2Se3 nanowire decreased with increasing temperature. However, a larger thermal activation energy of ~ 4.2 eV was found near a temperature above 420 K. We speculate that the reduction of resistance at a higher temperature was due to the breakdown of grain boundary barriers.
Dichlorido(η4-cycloocta-1,5-diene)bis(triphenylphosphine)osmium(II)
Chen Ye,Ting Bin Wen
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809037817
Abstract: The OsII atom in the title compound, [OsCl2(C8H12)(C18H15P)2], is located on a crystallographic twofold axis and adopts a distorted octahedral coordination geometry. The two triphenylphosphine ligands are trans to each other, while the two chlorine ligands are cis-disposed. The coordination is completed by the cyclooctadiene (COD) ligand with bonding to the two olefin double bonds. The C=C bond has a length of 1.403 (6) , which is significntly longer than a free olefinic double bond ( 1.34 ).
cis-Dichloridotetrakis(trimethylphosphane-κP)ruthenium(II) benzene disolvate
Chen Fu,Ting Bin Wen
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810049706
Abstract: The title compound, cis-[RuCl2(C3H9P)4]·2C6H6, contains a complex molecule with a crystallographic mirror plane passing through the RuII atom, the two cis-disposed Cl ligands and two P atoms of the two cis-disposed P(CH3)3 ligands. The RuII atom adopts a distorted octahedral RuCl2P4 coordination geometry with the two trans-disposed P atoms occupying the axial positions. The packing of the structure is accomplished through non-classical C—H...Cl hydrogen bonds between the benzene solvent molecule and one of the Cl ligands.
Role of Cyclin B1/Cdc2 Up-Regulation in the Development of Mitotic Prometaphase Arrest in Human Breast Cancer Cells Treated with Nocodazole
Hye Joung Choi, Masayuki Fukui, Bao Ting Zhu
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024312
Abstract: Background During a normal cell cycle, the transition from G2 phase to mitotic phase is triggered by the activation of the cyclin B1-dependent Cdc2 kinase. Here we report our finding that treatment of MCF-7 human breast cancer cells with nocodazole, a prototypic microtubule inhibitor, results in strong up-regulation of cyclin B1 and Cdc2 levels, and their increases are required for the development of mitotic prometaphase arrest and characteristic phenotypes. Methodology/Principal Findings It was observed that there was a time-dependent early increase in cyclin B1 and Cdc2 protein levels (peaking between 12 and 24 h post treatment), and their levels started to decline after the initial increase. This early up-regulation of cyclin B1 and Cdc2 closely matched in timing the nocodazole-induced mitotic prometaphase arrest. Selective knockdown of cyclin B1or Cdc2 each abrogated nocodazole-induced accumulation of prometaphase cells. The nocodazole-induced prometaphase arrest was also abrogated by pre-treatment of cells with roscovitine, an inhibitor of cyclin-dependent kinases, or with cycloheximide, a protein synthesis inhibitor that was found to suppress cyclin B1 and Cdc2 up-regulation. In addition, we found that MAD2 knockdown abrogated nocodazole-induced accumulation of cyclin B1 and Cdc2 proteins, which was accompanied by an attenuation of nocodazole-induced prometaphase arrest. Conclusions/Significance These observations demonstrate that the strong early up-regulation of cyclin B1 and Cdc2 contributes critically to the rapid and selective accumulation of prometaphase-arrested cells, a phenomenon associated with exposure to microtubule inhibitors.
On the convergence of densities of finite voter models to the Wright-Fisher diffusion
Yu-Ting Chen,Jihyeok Choi,J. Theodore Cox
Mathematics , 2013,
Abstract: We study voter models defined on large sets. Through a perspective emphasizing the martingale property of voter density processes, we prove that in general, their convergence to the Wright-Fisher diffusion only involves certain averages of the voter models over a small number of spatial locations. This enables us to identify suitable mixing conditions on the underlying voting kernels, one of which may just depend on their eigenvalues in some contexts, to obtain the convergence of density processes. Our examples show that these conditions are satisfied by a large class of voter models on growing finite graphs.
TEMPO: Feature-Endowed Teichmüller Extremal Mappings of Point Clouds
Ting Wei Meng,Pui Tung Choi,Lok Ming Lui
Computer Science , 2015,
Abstract: In recent decades, the use of 3D point clouds has been widespread in computer industry. The development of techniques in analyzing point clouds is increasingly important. In particular, mapping of point clouds has been a challenging problem. In this paper, we develop a discrete analogue of the Teichm\"{u}ller extremal mappings, which guarantee uniform conformality distortions, on point cloud surfaces. Based on the discrete analogue, we propose a novel method called TEMPO for computing Teichm\"{u}ller extremal mappings between feature-endowed point clouds. Using our proposed method, the Teichm\"{u}ller metric is introduced for evaluating the dissimilarity of point clouds. Consequently, our algorithm enables accurate recognitions and classifications of point clouds. Experimental results demonstrate the effectiveness of our proposed method.
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