The impact of modulation index on the BER performance of BPPM in UWB radio is analyzed in multipath indoor channels. The recommendations for the optimal modulation index choice are drawn up with respect to minimum bit error rate in multipath indoor channel. The theoretical expression for BER performance of BPPM is derived. The BER performance figures for different data rates as a function of a signal to a noise ratio produced by using the theoretical expression and computer simulations are presented. MATLAB is used for computer simulations.
Modern universities developing a digital environment rely on a student-centered approach, relevant pedagogical and didactic practices taking into account learners' characteristics and adapting it to the educational process. Personalization of the educational environment should improve the quality of the educational process raising it to a new level. This article presents the results of the multivariate modeling methods to identify standard relations and patterns between academic performance and students' psychometric characteristics. The results of students testing at the Novosibirsk State Technical University (NSTU) determining their cognitive, motivational, and personal characteristics are considered in this paper and information about all past certification tests is provided for the curriculum.
This method relates to selecting ions with a predetermined ion mobility from its mixture containing ions and electrically neutral molecules. More particularly, this method enables to extract ions of interest from a flow of analyzed gas so that they can be directed into a clean gas flow where they can be quantified. The method provides more effective separation, increases the resolution of ion selecting device and therefore enables to quantify complex mixtures at low concentrations molecules of interest in gases.
The paper proposes a construction of error-correcting block codes with synchronization in packet serial data transmission over a noisy channel, which has a low complexity of encoder and decoder implementations. A study of corrective abilities of constructed codes in comparison with some concatenated codes is presented.
A method for suppressing hindering navigation interference while sonar searching of an autonomous uninhabited underwater object located at the bottom of a known sea area from a surface vessel is considered.
In the paper, a mathematical model of the absorption technological process as an object of management is obtained. This model describes the process of natural gas absorption and is designed to control this process automatically. The model is based on the equations of material and thermal balances. The results of numerical simulation confirm the sensitivity of the process behavior to automatic regulation.
Thread-local garbage collection (TLGC) is a technique of automatic memory management that associates memory locations with a specific application thread. These memory areas (thread-local heaps) support independent processing allowing other mutator threads to be concurrently executed. Improved scalability and throughput make thread-local memory manager an attractive alternative to conventional GC algorithms. This paper discusses effectiveness of thread-local GC applied to distributed systems for large-scale data processing. Experimental results show that the proposed approach increases overall system throughput and proves that TLGC is a suitable choice for memory-intensive fault-tolerant distributed systems.
To solve the problem of multicollinearity in regression analysis a distorted coefficients straightening method developed by the author and based on the construction of fully connected linear regression model can be used. In the article, to assess the degree of independent variables influence on the dependent variable in the regression equation obtained by using this method, it is proposed to use the variables relative contributions to the total determination. It is proved that in such an equation in the case of linear functional dependence of the input variables their relative contributions to the total determination are equal. Then, with a strong correlation of the input variables, their contributions are distributed approximately in the same way. It is proved that the problem of estimating a fully connected regression does not depend on the choice of connecting variable. The obtained results have been successfully demonstrated using the example of the Russia's GDP modeling.
In this paper a new route selecting method for laying engineering communications taking into account the urban development saturation with various infrastructural objects, designed communications type and purpose, communications rotation angles around a given axis when avoiding obstacles, and other restrictions is proposed. The communications laying routes unlike the traditional representation are considered as three-dimensional object in space which has a restriction according both plan and profile. In addition, the communications placement region is considered as a three-dimensional space and is modeled as a three-dimensional computational network. The communications optimization task in the form of minimal hypernet structure with restrictions and requirements imposed on the designed communications is proposed. A modified ray tracing method enabling to choose a path depending on the angular and linear coordinates predetermining the communications position in space is proposed.
