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Search Results: 1 - 10 of 120092 matches for " Xingang Wang "
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Theoretical Analysis of Financial Portfolio Model  [PDF]
Xingang Wang
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.53B015

This article introduces portfolio selection model proposed by Markowitz in 1952, as well as research of model promoted continually by subsequent researchers, and then introduces a more classic pricing model CAPM in stock market, and discusses difficulties in the study of modern portfolio theory, and forecasts problems of benefits and risks.

Study on Financial Management Innovation and Currency Policy  [PDF]
Xingang Wang, Shangzhi Yue
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.53B014

The thesis analyzes the role of transform risks caused by innovation tools, the extent to which financial innovation tools have an influence on risks of financial system, the extent to which financial innovation has an influence on financial statement and macro monetary policy, the extent to which financial innovation exerts influences on classification of monetary, government’s requirement for monetary, the degree to which financial innovation exerts an influence on control of money supply. This thesis studies the alternative and significance of monetary aggregates, a new perspective of financial innovation and general money supply. Financial innovation can enhance the efficiency of the whole financial market and proactively promote economic development. Financial innovation is charactered by anteriority and financing, also can erase inflation.

Saturated Power Control Scheme for Kalman Filtering via Wireless Sensor Networks  [PDF]
Dongmei Zhang, Zhuangwei Miao, Xingang Wang
Wireless Sensor Network (WSN) , 2013, DOI: 10.4236/wsn.2013.510023

We investigate the Kalman filtering problem via wireless sensor networks over fading channels. When part or all of the observation measurements are lost in a random fashion, we obtain the conclusion that the packet dropout probabilities depend upon the time-varying channel gains and the transmission power levels used by the sensors. We develop a satu- rated power controller which trades off sensor energy expenditure versus state estimation accuracy. The latter is measured by the expected value of the future covariance matrices provided by the associated time-varying Kalman filter. We study the statistical convergence properties of the error covariance matrix and pointed out the existence of the admissible packet arrival probability bound.

Research on Cold Chain Logistics Traceable System for Fresh Agricultural Products  [PDF]
Xingang Weng, Hui Yang, Lei Wang
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.512071
Abstract: The trace of agricultural products logistics process is an important part of supply chain full retrospective. Factors of quality and safety of agricultural products run throughout the agricultural products from production to processing, packaging, storage, transportation and sales. For ensuring the safety of agricultural products, establishing full traceable system covering production, processing and distribution are particularly important. Based on the analysis of the connotation of the cold chain logistics system of agricultural products, this article analyzes cold chain logistics traceable system’s framework and key elements, and further puts forward the path choice of cold chain logistics traceable system's implementation for agricultural products.
Quasi-Single Field Inflation and Non-Gaussianities
Xingang Chen,Yi Wang
Physics , 2009, DOI: 10.1088/1475-7516/2010/04/027
Abstract: In quasi-single field inflation models, massive isocurvature modes, that are coupled to the inflaton and have mass of order the Hubble parameter, can have nontrivial impacts on density perturbations, especially non-Gaussianities. We study a simple example of quasi-single field inflation in terms of turning inflaton trajectory. Large bispectra with a one-parameter family of novel shapes arise, lying between the well-known local and equilateral shape. The trispectra can also be very large and its magnitude tNL can be much larger than fNL squared.
Quasi-Single Field Inflation with Large Mass
Xingang Chen,Yi Wang
Physics , 2012, DOI: 10.1088/1475-7516/2012/09/021
Abstract: We study the effect of massive isocurvaton on density perturbations in quasi-single field inflation models, when the mass of the isocurvaton M becomes larger than the order of the Hubble parameter H. We analytically compute the correction to the power spectrum, leading order in coupling but exact for all values of mass. This verifies the previous numerical results for the range 0
Transitions to Measure Synchronization in Coupled Hamiltonian Systems
Xingang Wang,Gang Hu
Physics , 2002, DOI: 10.1142/S021797920302243X
Abstract: Transitions to measure synchronization in two coupled $\phi ^{4}$ lattices are investigated based on numerical simulations. The relationship between measure synchronization (MS), phase locking and system's total energy is studied both for periodic and chaotic states. Two different scalings are discovered during the process to MS according to phase locking. Random walk like phase synchronization in chaotic measure synchronization is found, and phase locking interrupted by phase slips irregularly is also investigated. Meanwhile, related analysis is qualitative given to explain this phenomenon.
Relic Vector Field and CMB Large Scale Anomalies
Xingang Chen,Yi Wang
Physics , 2013, DOI: 10.1088/1475-7516/2014/10/027
Abstract: We study the most general effects of relic vector fields on the inflationary background and density perturbations. Such effects are observable if the number of inflationary e-folds is close to the minimum requirement to solve the horizon problem. We show that this can potentially explain two CMB large scale anomalies: the quadrupole-octopole alignment and the quadrupole power suppression. We discuss its effect on the parity anomaly. We also provide analytical template for more detailed data comparison.
Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation
Xingang Chen,Yi Wang
Physics , 2009, DOI: 10.1103/PhysRevD.81.063511
Abstract: We study the slow-roll inflation models, where the inflaton slow-rolls along a trajectory whose orthogonal directions are lifted by potentials with masses of order the Hubble parameter. In these models large non-Gaussianities can be generated through the transformation from the isocurvature modes to the curvature mode, once the inflaton trajectory turns. We find large bispectra with one-parameter family of novel shapes, interpolating between the equilateral and local shape. According to the in-in formalism, the shapes of these non-Gaussianities are different from a simple projection from the isocurvature non-Gaussian correlation functions.
Anomalous High Energy Dependence in Inflationary Density Perturbations
Xingang Chen,Yi Wang
Physics , 2012,
Abstract: We study the contribution of spectator massive scalar fields to the inflationary density perturbations through the universal gravitational coupling. We find that such contribution has several remarkable properties: it does not decrease as the mass of the spectator field increases; it has a significant size and cannot be turned off by any adjustable parameters; and it applies to all massive scalars existed during inflation, making the overall effect unexpectedly large. As a result, the primordial density perturbations are anomalously sensitive to the high energy physics.
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