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Search Results: 1 - 10 of 51792 matches for " Bing Wu "
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Empirical Analysis of Gray Relational Analysis of Employment Structure and Industrial Structure in Guangdong Province  [PDF]
Bing Wu
Journal of Human Resource and Sustainability Studies (JHRSS) , 2017, DOI: 10.4236/jhrss.2017.51005
Abstract: This paper mainly uses the gray relational analysis method to analyze the effect of the upgrading of industrial structure and the internal structure of the three industries on the employment of labor force in Guangdong Province. Based on the empirical analysis, this paper puts forward the promotion of the present situation in Guangdong Province suggestions for healthy development of employment.
Architecture of Dynamic Service Composition Using Logic Petri Nets  [PDF]
Xia Jiang, Bing Wu, Yuyue Du
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.410068
Abstract: Services are preprocessed based on clustering techniques in the levels of function and similarily of services. Service clustering is modeled by means of the passing value indeterminacy of logic Petri nets. Thus service clustering can be described, and the services with indeterminacy parameters can be modeled formally. Thus service composition is investigated under the classified architecture of service clustering. The architecture of dynamic service composition is given, and logic Petri nets are used for service realization. Services can be combined rapidly and automatically, and the path of a composition service can be constructed by automatic inference.
Research on HFACS Based on Accident Causality Diagram  [PDF]
Bing Wu, Luyao Kou, Qi Ma
Open Journal of Safety Science and Technology (OJSST) , 2017, DOI: 10.4236/ojsst.2017.72007
Abstract: Accident analysis contributes much to improve the safety management of enterprises. The Human Factors Analysis and Classification System (HFACS) is an accident analysis method popularly used overseas. Based on HFACS analysis method, this paper presents a new accident analysis method combining HFACS with Accident Causality Diagram. On the basis of the clear description of basic events’ causal relationship in the accident, the new approach applies HFACS to evaluate the basic events leading to accident, which overcomes the deficiency of HFACS that the ultimate analysis result is not clear enough to understand due to the lack of the association between basic events and the events at other levels in the accident. The new method is used to analyze the collision accident of two vehicles in mining area. It can be concluded that HFACS based on Accident Causality Diagram is feasible and it helps to find out the main reasons that lead to accident and thus to take proper measures to prevent the occurrence of similar accidents.
Rotation numbers of invariant manifolds around unstable periodic orbits for the diamagnetic Kepler problem
Zuo-Bing Wu
Physics , 2008,
Abstract: In this paper, a method to construct topological template in terms of symbolic dynamics for the diamagnetic Kepler problem is proposed. To confirm the topological template, rotation numbers of invariant manifolds around unstable periodic orbits in a phase space are taken as an object of comparison. The rotation numbers are determined from the definition and connected with symbolic sequences encoding the periodic orbits in a reduced Poincar\'e section. Only symbolic codes with inverse ordering in the forward mapping can contribute to the rotation of invariant manifolds around the periodic orbits. By using symbolic ordering, the reduced Poincar\'e section is constricted along stable manifolds and a topological template, which preserves the ordering of forward sequences and can be used to extract the rotation numbers, is established. The rotation numbers computed from the topological template are the same as those computed from their original definition.
Self-Similarity Limits of Genomic Signatures
Zuo-Bing Wu
Physics , 2002,
Abstract: It is shown that metric representation of DNA sequences is one-to-one. By using the metric representation method, suppression of nucleotide strings in the DNA sequences is determined. For a DNA sequence, an optimal string length to display genomic signature in chaos game representation is obtained by eliminating effects of the finite sequence. The optical string length is further shown as a self- similarity limit in computing information dimension. By using the method, self-similarity limits of bacteria complete genomic signatures are further determined.
Stability of a hot two-temperature accretion disc with advection
Xue-Bing Wu
Physics , 1997, DOI: 10.1093/mnras/292.1.113
Abstract: The effects of radial advection and thermal diffusion were considered in investigating the linear stability of an optically thin, two-temperature accretion disc. If the disc has only very little advection, we proved that the thermal instability exists when the disc is geometrically thin. But it dispears in a geometrically slim disc if the thermal diffusion was considered. Moreover, if the disc is advection dominated, the thermal instability does not exist. In addition, we found that the instabilities of inertial-acoustic modes exist only in a geometrically thin disc or an advection-dominated disc with low Mach number, whereas the Lightman & Eardley viscous instability always dispears in a two-temperature disc. A simple comparison also showed that an optically thin, bremsstrahlung cooling dominated disc is generally more thermally unstable than a two-temperature disc if it is not advection-dominated.
Generalized thermal instability criterion of black hole accretion disks
Xue-Bing Wu
Physics , 1998, DOI: 10.1088/0256-307X/15/7/027
Abstract: The conventional thermal instability criterion can not be applied to the advection-dominated accretion disks around black holes where the radiative cooling is insufficient to balance the viscous heating. The surface density change associated with the temperature perturbations, which was usually neglected in deriving the conventional criterion, was recently shown to be much significant in the advection-dominated disks. Considering both advection and surface density change, I suggested a generalized thermal instability criterion. By applying it to the optically thin and optically thick advection-dominated disks, I found that the former one is thermally stable and the latter one is thermally unstable against short wavelength perturbations, which agrees well to those found recently by both analytic and quantitative stability analyses.
Streamline topology and dilute particle dynamics in a Karman vortex street flow
Zuo-Bing Wu
Physics , 2004,
Abstract: Three types of streamline topology in a Karman vortex street flow are shown under the variation of spatial parameters. For the motion of dilute particles in the K\'arm\'an vortex street flow, there exist a route of bifurcation to a chaotic orbit and more attractors in a bifurcation diagram for the proportion of particle density to fluid density. Along with the increase of spatial parameters in the flow filed, the bifurcation process is suspended, as well as more and more attractors emerge. In the motion of dilute particles, a drag term and gravity term dominate and result in the bifurcation phenomenon.
Trapped Disk Oscillations and Stable QPOs in Microquasars
Xue-Bing Wu
Physics , 2000,
Abstract: The observed quasi-periodic oscillations (QPOs) in low-mass X-ray binaries have been suggested to be probably related to the characteristic oscillation modes in the inner part of a relativistic accretion disk. In this paper we study the trapped feature of these oscillation modes by considering the radial perturbations and viscosity effects. We find that the trapped oscillations are amplified significantly when the viscosity parameter increases and the trapped size varies when the radial wavenumber and Mach number change. Our results support that the stable hundred-hertz QPOs and their low fractional rms amplitudes found in two Galactic microquasars may be explained by some trapped non-damping oscillation modes in the inner part of accretion disks around rotating black holes.
On the Relative Surface Density Change of Thermally Unstable Accretion Disks
Xue-Bing Wu
Physics , 1997, DOI: 10.1086/304785
Abstract: The relations among the relative changes of surface density, temperature, disk height and vertical integrated pressure in three kinds of thermally unstable accretion disks were quantitatively investigated by assuming local perturbations. The surface density change was found to be very small in the long perturbation wavelength case but can not be ignored in the short wavelength case. It becomes significant in an optically thin, radiative cooling dominated disk when the perturbation wavelength is shorter than 15H (H is the scale height of disk) and in a geometrically thin, optically thick and radiation pressure dominated disk when the perturbation wavelength is shorter than 50H. In an optically thick, advection-dominated disk, which is thermally unstable against short wavelength perturbations, the relative surface density change is much larger. We proved the positive correlation between the changes of surface density and temperature in an optically thick, advection- dominated disk which was previously claimed to be the essential point of its thermal instability. Moreover, we found an anticorrelation between the changes of disk height and temperature in an optically thick, advection-dominated disk. This is the natural result of the absence of appreciable vertical integrated pressure change.
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