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Search Results: 1 - 10 of 139985 matches for " Xin Li "
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The Effect of Pregnancy on Intertemporal Choice and Its Mechanism  [PDF]
Xin Li
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.710134
Abstract: Pregnancy has been considered a special period with cognitive defect and unstable emotion. However, physiological and psychological changes jointly reshape the brain of pregnant women, which makes them more patient and prefer future outcomes. Specifically, they become more future-orientated, self-controlled and more positive to the future. These phenomena can be accounted for evolution perspective and construal level theory. Furthermore, we recommend that future researches pay attention to the effect of pregnancy on intertemporal choice in different domains and the relevant influence of expectant fathers on delay discounting.
A Fixed-Phase Quantum Search Algorithm with More Flexible Behavior  [PDF]
Xin Li, Panchi Li
Journal of Quantum Information Science (JQIS) , 2012, DOI: 10.4236/jqis.2012.22006
Abstract: When the Grover’s algorithm is applied to search an unordered database, the probability of success usually decreases with the increase of marked items. To address this phenomenon, a fixed-phase quantum search algorithm with more flexible behavior is proposed. In proposed algorithm, the phase shifts can be fixed at the different values to meet the needs of different practical problems. If research requires a relatively rapid speed, the value of the phase shifts should be appropriately increased, if search requires a higher success probability, the value of the phase shifts should be appropriately decreased. When the phase shifts are fixed at , the success probability of at least 99.38% can be obtained in iterations.
Controlling Unstable Discrete Chaos and Hyperchaos Systems  [PDF]
Xin Li, Suping Qian
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.411A2001

A method is introduced to stabilize unstable discrete systems, which does not require any adjustable control parameters of the system. 2-dimension discrete Fold system and 3-dimension discrete hyperchaotic system are stabilized to fixed points respectively. Numerical simulations are then provided to show the effectiveness and feasibility of the proposed chaos and hyperchaos controlling scheme.

The Market Pricing of Information Risk: From the Perspective of the Generating and Utilizing of Information  [PDF]
Xindong Zhang, Xin Li
Journal of Financial Risk Management (JFRM) , 2014, DOI: 10.4236/jfrm.2014.34014
Abstract: Generating and utilizing are the two sources of the information risk, reflecting the quality of financial reporting and investors’ information interpreting ability respectively. Using accrual quality to represent the financial reporting quality and the earnings transparency to represent investors’ information interpreting ability, we examine the correlation among them. By combining the generating and utilizing steps of information, we construct a two-dimensional information risk factor, which equals the excess return of portfolios in high-risk areas subtract that in low-risk areas. Then, taking the Fama-MacBeth two-stage cross-sectional regression procedure, we test whether the information risk factor is a pricing factor with individual stocks and industry portfolios respectively, and the empirical results support the point that information risk is priced by market.
Characteristic Analysis of Transient Electromagnetic Disturbance Data in Substation  [PDF]
Xin Wu, Shu Li
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.35013

Characteristic analysis of transient electromagnetic disturbance data is very important. In this paper, the time-domain and frequency-domain characteristics of transient electromagnetic disturbance caused by switching operations in substations are analyzed. Two methods are adopted in time-domain analysis. One method is histogram and the other one is normality test. An appropriate procedure for the normality test is proposed. Furthermore, the method used in frequency- domain analysis is to obtain overall envelope. These statistical characteristic analysis methods are showed to be of great value in analyses of the measured samples. The simulation results showed that these methods are effective.

Environment Problems of City Development in China  [PDF]
Xin Li, Yanli Qiao
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.35012
Abstract: Environmental issues in the process of rapid urbanization are critical to the sustainability of China. Compact cities, characterized by relative high density, mixed land-use and pedestrian-oriented habitation, have been proposed as one solution for sustainable urban planning. However, given the fact that Chinese cities are characterized by high population densities, the applicability of a more compact solution to expanding cities in China remains questionable. Essential to the decision-making is a deeper understanding about the relationship between urban compactness and the sustainable environment of the cities. This study is proposed for an evaluation about the urbanization and urban development in China’s context from environmental perspective, especially with respect to atmospheric environment, water resources, waste pollution, and noise problems.
A Safety Relay Selection Method Based on Network Coding  [PDF]
Qiang Guo, Xin Li
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.108B018
A method of cooperative relay selection based on network coding security is proposed for relay selection problem of cooperative communication system security in networked multi-relay scenarios, which is different from the existing relay node selection method. The algorithm not only merged with timestamp and homomorphic signature to construct the node degree of safety to find reliable relay, at the same time to considers the received signal to noise ratio at all relay nodes value and the channel gain to the source node. The simulation results show that the proposed method can improve the achievable rate of the destination node and reduce the outage probability on the basis of guaranteeing the safety of the relay node.
A Research on Control Layers of SOEs and R & D Investment  [PDF]
Xin Lu, Ruihong Li
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.95059
Abstract: The pyramid structure of the SOEs along with the process of continuous reform has significantly affected the business activities and the decision-making behaviors of enterprises. Based on the data from 2007 to 2015, the paper validates the influence of the length of the control chain of SOEs on the R & D investment behavior of enterprises. Through analysis, we find that, with the control chain being lengthened, it suggests the significant decrease in R & D investment, but this correlation is not obvious for the central SOEs. Further research finds that, although there is no significant effect between the length of the control chain of the central SOEs and the R & D investment in the case of the whole sample, when the control layer is greater than median, the elongation of the control chain significantly inhibits the R & D investment of central SOEs and local SOEs. What’ s more, we find that the negative correlation of the number of control layers and R & D investment for local SOEs is only significant when the agent cost is lower.
Integral Equations in Neutrino Mass Searches from Beta Decay  [PDF]
Thomas M. Semkow, Xin Li
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.71004
Abstract: A new mathematical model for elucidating neutrino mass from beta decay is proposed. It is based upon the solutions of transformed Fredholm and Abel integral equations. In principle, theoretical beta-particle spectra can consist of several neutrino-mass eigenstates. Integration of the beta spectrum with a normalized instrumental response function results in the Fredholm integral equation of the first kind. This equation is then transformed to yield a solution in a form of superposition of Heaviside step-functions, one for each neutrino mass eigenstate. A series expansion leading to matrix linear equations is then derived to solve the transformed Fredholm equation. Another approach is derived when the theoretical beta spectrum is obtained by a separate deconvolution of the observed spectrum. It is then proven that the transformed Fredholm equation reduces to the Abel integral equation. The Abel equation has a general integral solution, which is proven in this work by using a specific equation for the beta spectrum. Several examples of numerical solutions of the Abel equation are provided, which show a fractional sensitivity of about 10-3?for subtle neutrino eigenstate searches and can distinguish from the beta-spectrum discrepancies, such as minute shape and energy nonlinearities.
Observer Design Based on Self-Recurrent Consequent-Part Fuzzy Wavelet Neural Network
Xin Wen,Xin Li
- , 2016, DOI: 10.1109/TST.2016.7590323
Abstract: In this paper, we propose and construct an observer design based on a Self-Recurrent Consequent-Part Fuzzy Wavelet Neural Network (SRCPFWNN) for a class of nonlinear system. We use a Self-Recurrent Wavelet Neural Network (SRWNN) to construct a self-recurrent consequent part for each rule of the Takagi-Sugeno-Kang (TSK) model in the SRCPFWNN and analyze the structure of the fuzzy wavelet neural network model. Based on the Direct Adaptive Control Theory (DACT) and a back propagation-based learning algorithm, all parameters of the consequent parts are updated online in the SRCPFWNN. On this basis, we propose a design method using an adaptive state observer based on an SRCPFWNN for nonlinear systems. Using the Lyapunov function, we then prove the stability of this observer design method. Our simulation results confirm that the observer can accurately and quickly estimate the state values of the system.
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