OPTIMIZATION MODEL OF WAVE PROPAGATION IN COMPLEX ENVIRONMENTS

The accurate prediction for wave propagation field is very important in wireless communication, which can improve the quality in the wireless communication. However, the field prediction in complex environments is a not easy problem. In order to improve the accuracy of field prediction, many methods are presented. The optimization of the semi-experimental model is one method for improving field predictions. The semi-experiment wave prediction model is established by using a great deal experiment data. For the optimization of propagation model, the parameters in the model are determined according the practical propagation path.The optimization of propagation model in complex environment is not satisfactory now. In this paper, an improved optimation method is presented for wave propagation model in the complex environments. The main idea in the method is to divide the propagation path into multiple sections and each section has the similar propagation characteristics. In the optimization, in order to regularize the experimental data an interpolation method is used to the experimental data, which can improve the prediction accuracy. The simulation is performed and the simulation results show that the presented method can reduce the prediction error significantl

Existence of Solutions for a Class of Variable Exponent Integrodifferential System Boundary Value Problems

This paper investigates the existence of solutions for a class of variable exponent integrodifferential system with multipoint and integral boundary value condition in half line. When the nonlinearity term f satisfies sub-(p−−1) growth condition or general growth condition, we give the existence of solutions and nonnegative solutions via Leray-Schauder degree at nonresonance, respectively. Moreover, the existence of solutions for the problem at resonance has been discussed

The Study of Large-Scale Fading Using a Wavelet Transform Method

A wavelet method is proposed to evaluate the modeling of the first- and second-order statistics of large-scale fading from the signal strength measurement. The selection of wavelet is very important in using a wavelet method, and the steps of the wavelet method are given for the study of wave propagation loss. The path loss of measurement is analysed with different levels of wavelet decomposition and compared with an optimized Hata model. The correlation of slow fading on different scales shows that the correlation distance is related to the spatial scale

Existence of Solutions for Weighted<inline-formula> <graphic file="1029-242X-2010-751709-i1.gif"/></inline-formula>-Laplacian Impulsive Integro-Differential System Periodic-Like Boundary Value Problems

Abstract This paper investigates the existence of solutions for weighted -Laplacian impulsive integro-differential system periodic-like boundary value problems via Leray-Schauder's degree. The sufficient conditions for the existence of solutions are given.</p

Immunological and metabolic characteristics of the Omicron variants infection

Abstract The Omicron variants of SARS-CoV-2, primarily authenticated in November 2021 in South Africa, has initiated the 5th wave of global pandemics. Here, we systemically examined immunological and metabolic characteristics of Omicron variants infection. We found Omicron resisted to neutralizing antibody targeting receptor binding domain (RBD) of wildtype SARS-CoV-2. Omicron could hardly be neutralized by sera of Corona Virus Disease 2019 (COVID-19) convalescents infected with the Delta variant. Through mass spectrometry on MHC-bound peptidomes, we found that the spike protein of the Omicron variants could generate additional CD8 + T cell epitopes, compared with Delta. These epitopes could induce robust CD8 + T cell responses. Moreover, we found booster vaccination increased the cross-memory CD8 + T cell responses against Omicron. Metabolic regulome analysis of Omicron-specific T cell showed a metabolic profile that promoted the response of memory T cells. Consistently, a greater fraction of memory CD8 + T cells existed in Omicron stimulated peripheral blood mononuclear cells (PBMCs). In addition, CD147 was also a receptor for the Omicron variants, and CD147 antibody inhibited infection of Omicron. CD147-mediated Omicron infection in a human CD147 transgenic mouse model induced exudative alveolar pneumonia. Taken together, our data suggested that vaccination booster and receptor blocking antibody are two effective strategies against Omicron