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Search Results: 1 - 10 of 95354 matches for " Yu-chun WEN "
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The Covariance Structure Model Analysis of the Factors affecting the Entrepreneur's Human Capital Pricing in Venture Capital
Yu-chun WEN
Canadian Social Science , 2007,
Abstract: This paper carries on the analysis of the factors affecting entrepreneur's human capital pricing in venture capital, focusing on the much-dimensionality characteristic, then establishes a logical and comprehensive theory frame which can reflect all the factors affecting entrepreneur's human capital pricing. Further by using covariance structure model (CSM), we make an empirical analysis of these factors. The result shows, in venture capital the control rights of entrepreneur is the most important factor affecting the entrepreneur's human capital pricing, the scale of enterprise is the least one, with the enterprise management performance in the middle. Key Words: venture capital, the entrepreneur's human capital pricing, factors, covariance structure model Résumé: L’article présent, sur la base de l’analyse des facteurs affectant la fixation du prix du capital humain de l’entrepreneur dans l’investissement-risque, a établi pour ce problème multi-dimensions un cadre théorique logique et capable de refléter complètement ces facteurs influants. L’auteur adopte d’ailleurs la méthode analytique du modèle de la structure de covariance (CSM) pour effectuer une étude positiviste sur ces facteurs. Le résultat montre que, dans l’investissement-risque, le pouvoir de contr le de l’entrepreneur est le premier facteur en jeu, la perfomance de l’entreprise le deuxième et la dimension de l’entreprise le dernier. Mots-Clés: investissement-risque, fixation du prix du capital humain de l’entrepreneur, facteurs affectants
Early Fire Detection Based on Flame Contours in Video
Xiao-Lin Zhou,Fa-Xin Yu,Yu-Chun Wen,Zhe- Ming Lu
Information Technology Journal , 2010,
Abstract: This study proposed a method for early fire detection in video based on flame contours. The whole fire detection process includes three parts, i.e., candidate fire frame selection, flame region selection and flame contour-based fire decision. In the first step, the suspicious frames are detected and the unlikely frames are removed based on frame selection rules. The second step detects the flame pixels in the candidate fire frames by flame region selection rules. In the last step, four operations (i.e., dilation, erosion, mini region erasing and Canny edge detection) are performed on all flame regions to obtain the exact flame contours and then fire decision rules based on three characteristics (i.e., area, perimeter and roundness of flame contours) are employed to determine whether a fire occurs in the video or not. The proposed approach was tested with several video clips in different environments and the experimental results demonstrated its effectiveness.
A Novel Protection Architecture Scheme for EPON
Xiao-Lin Zhou,Fa-Xin Yu,Yu-Chun Wen,Zhe-Ming Lu
Information Technology Journal , 2011,
Abstract: With the rapid development of the Internet and extraordinary increase of bandwidth requirement, fiber based networks emerge and become more and more popular. The EPON (Ethernet Passive Optical Network) technology, which combines the mature Ethernet technology and high-bandwidth PON technology, is an ideal access method to achieve fiber based network service and appears to be the most widely-used access network. Thus, information reliability is becoming more and more important, making the protection of fiber based networks more and more necessary and crucial. Nowadays most EPONs are protected against failures by adopting redundant network equipments. This study proposes a novel protection method for EPON, which is more reliable and safer than existing schemes. This protection architecture scheme is able to provide protection for EPON and point out the exact failure reason for further physical recovery and repairing by the Network Management (NM) Server. Actual operations show that the proposed scheme can provide protection for at least three types of failures, i.e., the ONU link failure, the OLT link failure and the OLT failure.
A Vector Quantization Based Automatic Fire Detection System
Yu-Chun Wen,Fa-Xin Yu,Xiao-Lin Zhou,Zhe-Ming Lu
Information Technology Journal , 2010,
Abstract: longing to each grade between consecutive frames. Experimental results demonstrated the effectiveness of the proposed scheme and a 93.3% detection rate was obtained with 25 test video clips.
Is there model-independent evidence of the two-photon-exchange effect in the electron-proton elastic scattering cross section?
Yu-Chun Chen,Chung-Wen Kao,Shin-Nan Yang
Physics , 2007, DOI: 10.1016/j.physletb.2007.07.044
Abstract: We re-analyze the data of the elastic electron proton scattering to look for model-independent evidence of the two-photon-exchange (TPE) effect. In contrast to previous analyses, TPE effect is parametrized in forms which are free of kinematical-singularity, in addition to being consistent with the constraint derived from crossing symmetry and the charge conjugation. Moreover, we fix the value of $R=G_E/G_M$ as determined from the data of the polarization transfer experiment. We find that, at high $Q^2 \geq 2 GeV^2$ values, the contribution of the TPE effect to the slope of $\sigma_R$ vs. $\epsilon$ is large and comparable with that arising from $G_{E}$. It also behaves quasi-linearly in the region of current data, namely, in the range of $0.2 < \epsilon < 0.95$. Hence the fact that the current elastic $ep$ cross section data shows little nonlinearity with respect to $\epsilon$ can not be used to exclude the presence of the TPE effect. More precise data at extreme angles will be crucial for a model-independent extraction of the TPE effect.
Effect of Temperature on the Physico-Chemical Properties of a Room Temperature Ionic Liquid (1-Methyl-3-pentylimidazolium Hexafluorophosphate) with Polyethylene Glycol Oligomer
Tzi-Yi Wu,Bor-Kuan Chen,Lin Hao,Yu-Chun Peng,I-Wen Sun
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12042598
Abstract: A systematic study of the effect of composition on the thermo-physical properties of the binary mixtures of 1-methyl-3-pentyl imidazolium hexafluorophosphate [MPI][PF6] with poly(ethylene glycol) (PEG) [M w = 400] is presented. The excess molar volume, refractive index deviation, viscosity deviation, and surface tension deviation values were calculated from these experimental density, ρ, refractive index, n, viscosity, η, and surface tension, γ, over the whole concentration range, respectively. The excess molar volumes are negative and continue to become increasingly negative with increasing temperature; whereas the viscosity and surface tension deviation are negative and become less negative with increasing temperature. The surface thermodynamic functions, such as surface entropy, enthalpy, as well as standard molar entropy, Parachor, and molar enthalpy of vaporization for pure ionic liquid, have been derived from the temperature dependence of the surface tension values.
Leaching of lead from zinc leach residue in acidic calcium chloride aqueous solution
Le Wang,Wen-ning Mu,Hong-tao Shen,Shao-ming Liu,Yu-chun Zhai
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1094-y
Abstract: A process with potentially reduced environmental impacts and occupational hazards of lead-bearing zinc plant residue was studied to achieve a higher recovery of lead via a cost-effective and environmentally friendly process. This paper describes an optimization study on the leaching of lead from zinc leach residue using acidic calcium chloride aqueous solution. Six main process conditions, i.e., the solution pH value, stirring rate, concentration of CaCl2 aqueous solution, liquid-to-solid (L/S) ratio, leaching temperature, and leaching time, were investigated. The microstructure and components of the residue and tailing were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). On the basis of experimental results, the optimum reaction conditions were determined to be a solution pH value of 1, a stirring rate of 500 r·min?1, a CaCl2 aqueous solution concentration of 400 g·L?1, a liquid-to-solid mass ratio of 7:1, a leaching temperature of 80°C, and a leaching time of 45 min. The leaching rate of lead under these conditions reached 93.79%, with an iron dissolution rate of 19.28%. Silica did not take part in the chemical reaction during the leaching process and was accumulated in the residue.
Effect of Additive Elements on the Performance of the Zr_(1-x)Ti_x(NiCoMnV)_(2.1) Hydrogen Alloy Electrode

YU Bo,WEN Ming-fen,ZHAI Yu-chun,TIAN Yan-wen,

过程工程学报 , 2001,
Abstract: Zr1(xTix(NiCoMnV)2.1 hydrogen alloy electrodes are prepared by adding different conductors, binders and additives. The discharging capacity is tested for each electrode. The results show that the properties of the Zr1(xTix(NiCoMnV)2.1 hydrogen alloy electrode with nickel conductor are apparently better than that of the electrode with carbon black. The electrode with nickel conductor and Ag additive is the best, the first time discharging capacity of this electrode can be up to 215 mA(h/g, and plateau value is about 90%.
Numerical Simulation of Calcination of Limestone and Transport Process in a Packed Bed

LI Ming-chun,TIAN Yan-wen,ZHAI Yu-chun,

过程工程学报 , 2006,
Abstract: On the basis of the derived overall rate of decomposition in representative elementary volume in the heat transfer controlled regime, a one-dimensional mathematical model for the calcination of limestone coupled with heat and mass transfer in a packed bed was established by applying local thermal non-equilibrium assumption. Adopting a finite volume method to solve this model numerically, the mathematical model was validated by comparison with single particle experiment in the literature. The gas temperature and solid matrix temperature profiles, the concentration profile of product gas as well as the distribution of the fractional conversion of solid reactant were predicted under various conditions. The results are useful in the conceptual design and operation of packed bed reactor that is involved with strongly endothermic reactions.
Numerical Solution of Convection-Diffusion-Nonlinear Chemical Reaction Equation in Fixed Beds

LI Ming-chun,XU Zeng-he,ZHAI Yu-chun,TIAN Yan-wen,

过程工程学报 , 2004,
Abstract: Considering that the overall rate of a single pellet is co-dominated by intra-particle diffusion and chemical reaction, the overall rate of representative-element volume was derived from that of a single pellet. Then, the convection-diffusion-nonlinear reaction equation was established, and solved numerically. Taking the indirect reduction of iron ores as a case, the mass transfer, reaction and conversion process occuring within one-dimensional fixed bed was discussed. The results show that the size of pellets and convection velocity influence notably reaction and conversion process. Their influence can be measured by the Thiele module and Peclet module respectively. Because the Thiele module depends on L2 positively, and Pe* does on L positively, the length of reactor L is an important factor to influence the performance of reactor itself. The effect of convection on reaction and conversion descends, and gaseous conversion increases with increasing ratio of y/Pe*.
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