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Monolayer MoS2 photodetectors are modeled and simulated by self-consistently solving diffusive transport equations in the presence of light illumination with the two-dimensional (2-D) Poisson equation. The simulated results indicate that very high photoresponsivity (PR) of ∼1000A/W observed in others' experiments is due to strong electrostatic effect of pile up of optically generated holes, and efficient...
This paper examines hedging strategy in Chinese stock index futures market. Focus on task of forming a portfolio which holds long position of limited numbers of stock that outperforms the underlying index, and meanwhile holds short position of related index future. In order to select proper stocks, the particle swarm optimization is implemented, with minimizing the downside risk of return. The empirical...
PSO is an overall stochastic optimization algorithm based on the selection of the feature set and optimization of kernel function parameters, which has great impact on the forecasting performance of support vector machines (SVM) model. This paper presents the combining model (PSO-SVM) of the particle swarm optimization and support vector machine. This model uses the PSO to conduct the optimization...
Multivariate volatility modeling is always a hot topic in academic research. It is difficult to consider how to construct multivariate joint distribution. Copulas, a statistic method, can be used to decompose multivariate joint distribution into marginal distribution and correlation structure. This advantage is applied into calculating the dynamic VaR of a portfolio in the paper. Furthermore, a new...
The topic of tuition fees has recently sparked heated discussions in various media. Based on China's national conditions, this article collected elevant data, such as national student average funding, training costs, household disposable income and did the quantitative analysis for tuition standards of several types of schools, then built a Multi-level fuzzy evaluation model, which regarded the tuition...
Based on the data of 1978-2007, the relationship between financial support and the industrial structure optimization in the northeast China is discussed by Co-integration analysis and Granger Causality Test. We can conclude from the results of the empirical analysis that there exists long-term dynamic equilibrium interrelation, and that there is one-way Granger Causality between the two, namely financial...
Recently it was produced a backtrack technique for the efficient approximation of a time seriespsila future optima. Such an estimation is succeeded based on a selection of sequenced points produced from the repetitive process of the continuous optima finding. Additionally, it is shown that if any time series is treated as an objective function subject to the factors affecting its future values, the...
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