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Search Results: 1 - 10 of 108861 matches for " Jun Chen "
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Computing the Moore-Penrose Inverse of a Matrix Through Symmetric Rank-One Updates  [PDF]
Xuzhou Chen, Jun Ji
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.13016
Abstract: This paper presents a recursive procedure to compute the Moore-Penrose inverse of a matrix A. The method is based on the expression for the Moore-Penrose inverse of rank-one modified matrix. The computational complexity of the method is analyzed and a numerical example is included. A variant of the algorithm with lower computational complexity is also proposed. Both algorithms are tested on randomly generated matrices. Numerical performance confirms our theoretic results.
Service Cooperation Policy in a Dual-Channel Supply Chain under Service Differentiation  [PDF]
Jun Chen, Ying Yang
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.46036

A service collaboration decision problem in a dual-channel supply chain is studied with the service level and the customer’s acceptance of the Internet channel is taken into consideration. Then the Stackelberg decentralized decision model and the centralized decision model are developed for two settings that the retailer provides the same service level in both channels or not. The conclusion implies that the system profits, the manufacturer’s optimal profit and retailer’s optimal profit are always higher when different services are provided than the same service, and the optimal service level for the direct channel is a little lower than that for the traditional channel under decentralized mode.

Worker Recruiting with Favoritism and Bribery  [PDF]
Gen Chen, Jun Tang
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.53048
Abstract: This paper discusses the corruptive action widespread in the organizations’ worker recruiting: favoritism and bribery. The managers of the firm are actually able to discern the type of the productivity of the job-seekers, but they utilize the information advantage through the two types of misconduct—favoritism and bribery, at the expense of the profit share of the principal (the owner) and the workers’ wage rent. The key conclusion is drawn from this paper as follows: neither the intensity of favoritism nor the wage level matters in determining whether there’s profit or loss in the firm, whereas the key variable is the relative situation of exterior labor market.
On the Euphemistic Insinuation of the Historical Reality of America in the Poetic Historicity of I, Too, Sing America  [PDF]
Jun Luo, Guicai Chen
Advances in Literary Study (ALS) , 2019, DOI: 10.4236/als.2019.72007
In the historical observation of Harlem Renaissance that has already been epitomized in the historical elaboration in the poetic production of Langston Hughes, what his readers have been insatiable with is that although both international and Chinese scholars and critics have not only made various valuable explorations of his poetic texts but also made a mention of the lower social position and their unfair treatment of the dark brothers in the American society dominated by whites’ culture, they have hardly devoted their studies to this poetic text titled I, Too, Sing America to quest for the historical reality embedded euphemistically in the textual interweavement of this poetic text. Owing to their failure to do so in their studies, this paper will try to make an exploration of the euphemistic representation of the profound reality grounded on poetic historicity of this poetic text that dwells on historical reality of the miserable lots of those dark brothers.
Quasi-Bézier Curves with Shape Parameters
Jun Chen
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/171392
Favorable and Unfavorable Characteristics of EFL Teachers Perceived by University Students of Thailand
Jun Chen
International Journal of English Linguistics , 2012, DOI: 10.5539/ijel.v2n1p213
Abstract: Teachers play pivotal roles in EFL classrooms. Characteristics of EFL teachers may affect students’ attitudes and motivations to language learning. The effective/good characteristics of the EFL teachers perceived by the students have been extensively investigated by the previous research works. However, the perceptions of the students from different backgrounds to EFL teachers may vary in different learning settings. In addition, the research works on both favorable and unfavorable characteristics of EFL teachers are comparatively scarce. This study aimed to investigate the favorable and unfavorable characteristics of the EFL teachers perceived by Thai university students. The data were collected from 6o students at Vongchavalitkul University. Open-ended questionnaires and semi-structured interviews were used as the main instruments for data collection. Useful information about EFL teachers’ personal trait-related characteristics and classroom teaching-related characteristics emerged from the data. The information is very useful and beneficial for the EFL teachers to reflect their personal characteristics and reconsider their classroom teaching, which may be very helpful for them to do some adjustment and preparation in their teaching to achieve better education results.
Subsonic Flows for the Full Euler Equations in Half Plane
Jun chen
Mathematics , 2007,
Abstract: We study the subsonic flows governed by full Euler equations in the half plane bounded below by a piecewise smooth curve asymptotically approaching x1-axis. Nonconstant conditions in the far field are prescribed to ensure the real Euler flows. The Euler system is reduced to a single elliptic equation for the stream function. The existence, uniqueness and asymptotic behaviors of the solutions for the reduced equation are established by Schauder fixed point argument and some delicate estimates. The existence of subsonic flows for the original Euler system is proved based on the results for the reduced equation, and their asymptotic behaviors in the far field are also obtained.
A Class of Multi-particle Reinforced Interacting Random Walks
Jun Chen
Mathematics , 2012,
Abstract: We consider a class of multi-particle reinforced interacting random walks. In this model, there are some (finite or infinite) particles performing random walks on a given (finite or infinite) connected graph, so that each particle has higher probability to visit neighboring vertices or edges which have been seldom visited by the other particles. Specifically we investigate two particles' vertex-reinforced interacting random walks on finite complete graphs. By a dynamical approach we prove that the two particles' occupation measure asymptotically has small joint support almost surely if the reinforcement is strong.
Two-Point Statistics of Coherent Structure in Turbulent Flow  [PDF]
Jun Chen
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2019, DOI: 10.4236/jfcmv.2019.74012
Abstract: This review summarizes the coherent structures (CS) based on two-point correlations and their applications, with a focus on the interpretation of statistic CS and their characteristics. We review studies on this topic, which have attracted attention in recent years, highlighting improvements, expansions, and promising future directions for two-point statistics of CS in turbulent flow. The CS is one of typical structures of turbulent flow, transporting energy from large-scale to small-scale structures. To investigate the CS in turbulent flow, a large amount of two-point correlation techniques for CS identification and visualization have been, and are currently being, intensively studied by researchers. Two-point correlations with examples and comparisons between different methods are briefly reviewed at first. Some of the uses of correlations in both Eulerian and Lagrangian frames of reference to obtain their properties at consecutive spatial locations and time events are surveyed. Two-point correlations, involving space-time correlations, two-point spatial correlations, and cross correlations, as essential to theories and models of turbulence and for the analyses of experimental and numerical turbulence data are then discussed. The velocity-vorticity correlation structure (VVCS) as one of the statistical CS based on two-point correlations is reiterated in detail. Finally, we summarize the current understanding of two-point correlations of turbulence and conclude with future issues for this field.
Spectral Geometric Triangle Properties of Chlorophyll-A Inversion in Taihu Lake Based on TM Data  [PDF]
Jun Chen, Zhenhe Wen, Zhengqing Xiao
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.31008
Abstract: The main objective of this study was to develop and validate the applicability of the Area Chlorophyll-a Concentration Retrieved Model (ACCRM), Height Chlorophyll-a Concentration Retrieved Model (HCCRM), Angle Chlorophyll-a Concentration Retrieved Model (AgCCRM), and Ratio Model of TM2/TM3 (RM) in estimating the chlorophyll-a concentration in Case II water bodies, such as Taihu Lake in Jiangsu Province, China. Water samples were collected from 23 stations on the 27th and 28th of October, 2003. The four empirical models were calibrated against the calibration dataset (samples from 19 stations) and validated using the validation dataset (samples from 4 stations). The regression analysis showed higher correlation coefficients for the ACCRM and the HCCRM than for the AgCCRM and the Ratio Model; and the HCCRM was slightly superior to the ACCRM. The performance of the ACCRM and the HCCRM was validated, and the ACCRM underestimated concentration values more than the HCCRM. The distribution of chlorophyll-a concentrations in Taihu Lake on October 27, 2003 was estimated based on the Landsat/TM data using the ACCRM and the HCCRM. Both models indicated higher chlorophyll-a concentrations in the east, north and center of the lake, but lower concentrations in the south. The accuracy of results obtained from the HCCRM and the ACCRM were also supported by the validation dataset. The study revealed that the HCCRM and the ACCRM had the best potential for accurately assessing the chlorophyll-a concentration in the highly turbid water bodies.
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