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Search Results: 1 - 10 of 115847 matches for " Qi Zhang "
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Study on the Impact of Incentive Mechanisms and Internal Control Systems on Risk Management in Commercial Banks  [PDF]
Qi Zhang
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.53B033

The operational risks for commercial banks could be divided into four scenarios, which are the risks caused by malicious act, rational choice, inadequacy of capability and unconscious choices. Furthermore, these \"initiatives\" can be reflected in financial corruption, moral hazard, bounded rationality and irrational behavioral tendencies. Operational risk has become one of the three main risks for commercial banks since The New Basel Capital Accord released in 2004, together with credit risk and market risk. This article accordingly puts forward related proposals of the commercial banks’ operational risk management.

Influence of Relationship between Supply Chain Members on Innovation Performance  [PDF]
Qi Zhang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29029

In order to pursue development in fierce competition, enterprises have attached greater and greater importance to their innovation abilities. This paper analyzes the theory model about how the relationship between supply chain members can influence innovation performance. It is found that inter-firm trust and learning can help to promote relationship governance, and further enhance the innovation performance of the enterprises.

Research of the Corporate Performance Evaluation Indicators Based on the Stakeholder Theory  [PDF]
Qi Zhang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.37019

The traditional evaluation system of corporate performance by maximizing stakeholders’ value has increasingly shown its limitations, and the establishment of performance evaluation system based on stakeholder theory is particularly important. This paper describes stakeholders’ focuses on corporate performance evaluation and analyzes the importance of each of these concerns. Finally, based on the summary of the preceding analysis, this paper analyses the performance evaluation system based on the stakeholder theory, which is oriented by the maximization of corporate value, and proposes different focuses of the corporation according to different sectors and different circumstances.

Research on the Quality and Safety Management of Food Supply Chain  [PDF]
Qi Zhang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.47011

As the severe food safety situation in China becomes an urgent problem to be solved, the emergence and development of “Farmer-Supermarket Direct-Purchase” model, to some extent, provides favorable conditions for the solution of food safety problem. The research of food safety control which is based on “Farmer-Supermarket Direct-Purchase “model involves the coordination and unification among government’s macro-control, management structure of producer and supermarket. Based on the analysis of the factors and risks of “Farmer-Supermarket Direct-Pur- chase” management model, this article sets company A as an example analyzing the specific processes and potential risks of supplier relationship management, procurement and distribution etc. in the process of quality and safety management of food supply chain, in order to provide suggestions for the improvement of the of China’s food supply chain management efficiency.

Set-Valued Stochastic Integrals with Respect to Finite Variation Processes  [PDF]
Jinping Zhang, Jiajia Qi
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.39A1003

In a Euclidean space Rd, the Lebesgue-Stieltjes integral of set-valued stochastic processes \"\" with respect to real valued finite variation process \"\" is defined directly by employing all integrably bounded selections instead of taking the decomposable closure appearing in some existed references. We shall show that this kind of integral is measurable, continuous in t under the Hausdorff metric and L2-bounded.

Microwave-Assisted Modification of Carbon Nanotubes with Biocompatible Polylactic Acid  [PDF]
Qi Zhang, Shijun Zhang, Liying Zhang
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.21002

Polylactic acid (PLA) was successfully covalently grafted onto multi-walled carbon nanotubes (MWCNT) by microwave-assisted polymerization of lactide monomers. The final products MWCNT-g-PLA were characterized with Fourier-transform IR (FTIR), Raman spectroscopy, thermogravimetric analyses (TGA) and transmission electron microscopy (TEM). The results indicated PLA chain was covalently attached to the MWCNT. The grafted PLA was uniformly coated on the surface of MWCNT with a layer thickness of 2 ~ 6 nm. The grafted PLA content could be controlled by microwave irradiation time and the concentrations of reactant. The product with 60.5% grafted PLA content can be synthesized in one hour.

A Markov Based Performance Analysis of Handover and Load Balancing in HetNets  [PDF]
Baoling Zhang, Weijie Qi, Jie Zhang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.1010013
Abstract: LTE heterogeneous networks (HetNets) is becoming a popular topic since it was first developed in 3GPP Release 10. HetNets has the advantage to assemble various cell networks and enhance users’ Quality of Service (QoS) within the system. However, its development is still constrained by two main issues: 1) Load imbalance caused by different transmission powers for various tiers, and 2) The unbalanced transmission power may also increase unnecessary handover rate. In order to solve the first issue, Cell range expansion (CRE) can be applied in the system, which will benefit lower-tier cell during user association phase; CRE, Hysteresis Margin (HM) and Time-to-Trigger (TTT) will be utilized to bound UE within lower tier network of HetNets and therefore solve the second issue. On the other hand, the relationship of these parameters may be complicated and even reduce QoS if they are chosen incorrectly. This paper will evaluate the advantage and disadvantage of all three parameters and propose a Markov Chain Process (MCP) based method to find optimal HM, CRE and TTT values. And then, the simulation is taken and the optimal combination for our scenario is obtained to be 1 dB, 6 dB and 60 ms respectively. First contribution of this paper is to map the HetNets handover process into MCP and all the phases of handover can be calculated and analysed in probability way, so that further prediction and simulation can be realised. Second contribution is to establish a mathematical method to model the relationship of HM, CRE and TTT in HetNets, therefore the coordination of these three important parameters is achieved to obtain system optimization.
Terminal-Dependent Statistical Inference for the Integral Form of FBSDE
Qi Zhang
Discrete Dynamics in Nature and Society , 2013, DOI: 10.1155/2013/753025
Abstract: Backward Stochastic Differential Equation (BSDE) has been well studied and widely applied. The main difference from the Original Stochastic Differential Equation (OSDE) is that the BSDE is designed to depend on a terminal condition, which is a key factor in some financial and ecological circumstances. However, to the best of knowledge, the terminal-dependent statistical inference for such a model has not been explored in the existing literature. This paper is concerned with the statistical inference for the integral form of Forward-Backward Stochastic Differential Equation (FBSDE). The reason why I use its integral form rather than the differential form is that the newly proposed inference procedure inherits the terminal-dependent characteristic. In this paper the FBSDE is first rewritten as a regression version, and then a semiparametric estimation procedure is proposed. Because of the integral form, the newly proposed regression version is more complex than the classical one, and thus the inference methods are somewhat different from those designed for the OSDE. Even so, the statistical properties of the new method are similar to the classical ones. Simulations are conducted to demonstrate finite sample behaviors of the proposed estimators. 1. Introduction The Backward Stochastic Differential Equation (BSDE) was first presented by Bismut [1] for the linear case and by Pardoux and Peng [2] for the general case. The solution of a BSDE consists of a pair of adapted processes satisfying where is the generator, is the standard Brownian motion, and is the terminal condition. Usually the terminal condition is designed as a random variable with given distribution. If meets certain conditions, the BSDE has a unique solution. The integral form of the BSDE can be expressed as The study history of the BSDE was relatively short but progressed rapidly. In addition to the interesting mathematical nature, its extensive applications gained more and more attentions; see for example Peng [3], Pardoux and Peng [4], Pardoux and Tang [5], Peng and Wu [6], Ma and Yong [7], and Nualart and Schoutens [8]. Duffie and Epstein [9] used the BSDE to describe the consumer preferences under uncertain economic environment (i.e., the stochastic differential utility). El Karoui and Quenez [10] stated that in financial markets, prices of many important derivative securities could be solved by a certain BSDE. Lin et al. [11] used an extended statistical model to describe an ecological problem. Furthermore, the BSDE is closely related to nonlinear partial differential equation, more
On projective varieties with nef anticanonical divisors
Qi Zhang
Mathematics , 2004,
Abstract: We prove a structure theorem for projective varieties with nef anticanonical divisors.
Stationary Stochastic Viscosity Solutions of SPDEs
Qi Zhang
Mathematics , 2009,
Abstract: In this paper we aim to find the stationary stochastic viscosity solutions of a parabolic type SPDEs through the infinite horizon backward doubly stochastic differential equations (BDSDEs). For this, we study the existence, uniqueness and regularity of solutions of the corresponding infinite horizon BDSDEs as well as the "perfection procedure" applied to the solutions of BDSDEs. At last the "perfect" stationary stochastic viscosity solutions of SPDEs constructed by solutions of corresponding BDSDEs are obtained.
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