T-Comm最新文献

{"title":"ON PROBLEM OF PROPERTIES OPTIMIZING FOR VISCOELASTIC MATERIALS USING THE BEGLEY-TORVIK EQUATION","authors":"M.V. YASHINA, M.T. ALEROEV","doi":"10.36724/2072-8735-2023-17-8-63-68","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-8-63-68","url":null,"abstract":"Recently, fractional calculus has been the focus of attention of many researchers in the field of science and technology, since a more detailed study of physical processes leads to the need to complicate the mathematical models that describe them, and, consequently, to the study of the behavior of solutions of differential equations containing, along with \" ordinary\", or \"classical\", derivative, also fractional. Processes of this kind can include: studies of continuous media with memory, fluid filtration in media with fractal geometry, physical aspects of stochastic transfer and diffusion, mathematical models of a viscoelastic body, models of damped oscillations with fractional damping (for example, vibrations of rocks during earth-quakes or vibrations nanoscale sensors), models of non-local physical processes and phenomena of a fractal nature; climate models, etc. The paper studies boundary value problems for the equation of motion of an oscillator with viscoelastic damping (the Begley-Torvik equation) in the case when the damping order is greater than zero but less than two. Such problems model many physical processes, in particular, the vibration of a string in a viscous medium, the change in the deformation-strength characteristics of polymer concrete under loading, etc. This paper is devoted to optimizing the parametric control of the Begley-Torvik model. A fundamentally new, efficient algorithm is proposed that allows estimating the parameters of a model of real material.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SELECTIVE PROPERTIES OF TWO-RESONATOR STRUCTURES AND HIGHLY SELECTIVE FILTERS BASED ON THEM","authors":"G.M. ARISTARKHOV, I.N. KIRILLOV, V.V. KUVSHINOV, A.V. MARKOVSKIY","doi":"10.36724/2072-8735-2023-17-8-21-29","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-8-21-29","url":null,"abstract":"An increase in the frequency selectivity of microstrip filters is traditionally achieved by forming transient response zeros at final frequencies. In this case, the specified requirements for the selectivity of filters are provided with a smaller number of resonators, and, consequently, lower loss es in the passband are achieved in more compact structures. Thus, the effectiveness of this approach to the synthesis of microstrip filters is determined by the number of transient response zeros that can potentially be formed in various structures. One way to form damping transient response zeros is to introduce additional cross-couplings between non-adjacent resonators. However, when synthesizing highly selective filters based on such widely used N-resonator structures, a limited number of transient response zeros equal to N-2 is formed. At the same time, two-resonator structures are known in which a much larger number of transient response zeros is formed, which is several times greater than the number of resonators in them. However, each of these structures has its own specific frequency-selective properties, which limits the scope of their wide application as universal links. The aim of this work is the synthesis of highly selective two-cavity structures with various types of frequency characteristics, which expands the scope of such structures. The frequency properties of microstrip two-resonator structures of a new type, which have broad functionality and increased frequency selectivity, are studied. It is shown that in multistage structures on two half-wave hairpin resonators, under certain conditions, a significant number of transient response zeros is formed, which is two to three times greater than the number of resonators in the filter, and parasitic transmission bands also degenerate. Depending on the ratio of the coefficients of electromagnetic interaction in different sections of the length of the coupled resonators, they acquire the properties of both single-band and multi-band bandpass filters, as well as low-pass filters. The noted features predetermine the possibility of wide application of these structures as both independent compact filters and basic units as part of higher-order filters with a significantly limited number of resonators. The results of electrodynamic 3D modeling and experimental studies of the proposed structures are presented, which are in good agreement.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMMUNICATIONS AND DIGITAL TWINS","authors":"B. YA. LIKHTTSINDER","doi":"10.36724/2072-8735-2023-17-8-30-37","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-8-30-37","url":null,"abstract":"This article discusses various types of modeling and the concept of \"digital twin\", as well as concepts and examples of their implementation. It is noted that computer modeling allows not only to obtain a forecast, but also to determine which control actions on the system will lead to a favorable development of events between the components of the model, which are a reflection of real relationships. Modern production processes are very complex and distributed in space and time. Therefore, models of such processes should take into account the distributed nature of the modeling objects. An analysis of the interaction of the digital model with the simulation object representing the real process is also carried out. It is shown that the interaction occurs through interfaces that provide interface between the model and the simulation object. A cross-domain model for managing telecommunications functions is considered. As an example of digital twins using time series models, a model of time delay in a telecommunications network is considered. This model is used to control the buffering system in networks for the transmission of streaming video traffic.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETECTION AND SYNCHRONIZATION OF WEAK POWER SPREAD SPECTRUM SIGNALS IN A SATELLITE RADIO SYSTEM","authors":"S.F. GORGADZE, VU SY DAO","doi":"10.36724/2072-8735-2023-17-8-4-20","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-8-4-20","url":null,"abstract":"The problem of joint detection (search) and synchronization of one or several weak complex spread spectrum signals, mismatched on carrier frequency, frequency phase and time delay, in satellite radio system equipment is considered. It is supposed to use a multistage parallel-serial signal detection and synchronization procedure with joint detection and tracking devices for signal parameter changes with formation of their copies in the quasi-coherent receiver. For predetermined values of the characteristics of errors in the estimation of carrier frequencies and time delays of complex spread spectrum signals a method of approximate estimation of the duration of their detection and synchronization in the satellite radio system is developed. It is shown, that at a signal/noise ratio of the order (-10...-40) dB this time duration can make less than 0.5 s at consideration of possibilities of modern methods of processing of signals and the technological decisions used at their realization.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ENERGY EFFICIENCY INCREASING OF RADIO TRANSMITTERS","authors":"S.E. GRYCHKIN","doi":"10.36724/2072-8735-2023-17-5-25-31","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-5-25-31","url":null,"abstract":"At present, increasing the energy efficiency of radio electronic equipment is one of the most important tasks in the development and modernization of equipment for all radio services, and in some areas of application of radio electronic equipment, energy efficiency is critical. The main problems that occur in the development and operation of radio transmitting equipment are considered, and solutions are listed that can increase the efficiency of transmitters. Since the increase in energy efficiency is especially important for high-power power amplifiers of the final stages of transmitters, in this paper we analyze the radio transmitters switching operating modes, suitable for building modulators of the final stages of radio transmitters of digital broadcasting systems. The operating modes of switching power amplifiers and methods for achieving high energy efficiency of power amplifiers are discussed, their advantages and disadvantages are shown. The comparative analysis of circuits and classes of various types switching power amplifiers showed that each of them has a number of disadvantages that do not allow choosing the universal optimal version of such amplifier, so that the use of specific power amplifiers depends of the transmitter required characteristics. Another way is to use synthetic and combined methods for constructing high-performance power amplifiers to increase of the transmitters final stages resulting efficiency.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPROVING THE QUALITY OF TRANSPORTATION BASED ON THE CONSTRUCTION OF COMPLEX PREDICTIVE MODELS OF INFRASTRUCTURE LOADING","authors":"E.V. MALOVETSKAYA, A.K. MOZALEVSKAYA","doi":"10.36724/2072-8735-2023-17-7-38-46","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-38-46","url":null,"abstract":"Accurate construction of time series forecasts is a key element in the system of support and management decision-making. This article presents a method of multi-stage system forecasting of time series. The effectiveness of the proposed method is experimentally justified by the example of the arrival of car traffic at the junction points of railways. The most important contribution is the introduction of a system forecast, in which the methods of forecasting traffic flows will be mutually consistent and complementary, since the use of statistical methods alone will not fully reflect all the changes that occur in the transport complex of the Russian Federation. This hybrid combination provides more competitive forecasts compared to other methods. Moreover, such a hybrid model is easier to interpret by decision makers when modeling trend series.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SIMULATION OF A RADIAL-TWO-RING TYPICAL STRUCTURE OF THE TRANSPORT NETWORK BY THE METHOD OF TIGHTENING COMMUNICATION NODES","authors":"S.A. JASINSKII","doi":"10.36724/2072-8735-2023-17-5-42-47","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-5-42-47","url":null,"abstract":"The article presents the results of the substantiation of the approach to the choice of a radial-two-ring typical structure based on its mathematical modeling using the method of tightening communication nodes into an equivalent node, resulting in the formation of an equivalent radial-single-ring typical structure, to justify the choice of which well-known techniques and algorithms are used. The proposed approach to the choice of a radial-two-ring typical structure, along with the method of tightening communication nodes, is based on the methods of dynamic analogies and fractal self-similarity. Taking into account the dynamic analogies between all the transport components of heterogeneous networks (automobile, railway, telecommunications, etc.), the research was carried out in relation to the transport component of the telecommunications network, but taking into account the fact that the obtained research results can be used in other transport areas of transport logistics.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ASSESSMENT OF QUALITY OF SERVICE CHARACTERISTICS OF SIMILAR TRAFFIC IN GSM STANDARD MOBILE TELECOMMUNICATION NETWORKS","authors":"M.H. HASANOV, F.H. MAMMADOV, A.D. TAGHIYEV, G.H. GURBANOVA","doi":"10.36724/2072-8735-2023-17-6-48-53","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-6-48-53","url":null,"abstract":"P/M/1, which models the service processes of self-similar GPRS packet traffic in GSM standard mobile telecommunication networks, including Pareto and limited Pareto distributions, and fBM/D/1/∝ type single-channel mass service system, which takes into account the self-similarity of this traffic, has been viewed. Development of telecommunication networks. has gone through many different stages of development to the current modern networks, which eventually resulted in a large number of different types of mobile telecommunication networks. One of such networks is GSM (Global system for mobile communication) standard mobile telecommunication networks. In these networks, the directions of rapid development of modern service services are observed recently, one of these directions is the GPRS (General packet radio service) superstructure service, which is considered the superstructure of the GSM mobile network and carries out the transmission of data in packets. Analytical models of these systems are developed based on them Analytical methods have been proposed for evaluating relevant quality of service characteristics such as the relative average waiting time of packets in these systems, average queue length, buffer volume, and packet dwell time in the system. As well as the nature of the dependence of the shape parameter of the Pareto distribution on the Herst parameter was determined based on the experiment.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135754112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE ANTENNA SYSTEM FOR FM BROADCASTING WITH CIRCULAR POLARIZATION AND THE POSSIBILITY OF SIMULTANEOUS WORK BY TWO GROUPS OF TRANSMITTERS","authors":"YU.A. KHMELUK, F.D. SHUSTERMAN, K.E. SEREDA","doi":"10.36724/2072-8735-2023-17-6-4-12","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-6-4-12","url":null,"abstract":"In large radio centers with a large number of broadcasting transmitters of the VHF band operating in the range of 87.5-108 MHz the most common type of antennas are panel antennas. The advantage of these antennas is a large capacity – up to hundreds of kilowatts, the ability to form radiation patterns of various shapes based on the characteristics of the service area, the distribution of population density in this zone and sanitary requirements for residential areas. To meet these requirements, in some cases, the use of antennas that occupy a significant place on masts is required. The implementation of these requirements often interferes with the absence of sufficient free space on masts. In addition, at large radio centers there is a serious problem of placing a large number of powerful FM broadcasting transmitters on one antenna. One of the reasons for the limitation of the number of transmitters is large losses in inseries included combiners. One of the ways to increase the number of transmitters working on one antenna is the use of panel antennas with a doubled number of dipole in each panel having different polarization – vertical and horizontal. Such antennas allow you to work simultaneously with two groups of transmitters with different polarizations on two feeders. The disadvantage of such a solution is that different radio stations operating on the same antenna with different linear polarizations in different conditions of propagation of radio waves at the same power can create different field levels at reception points, which puts them in unequal conditions. Such an antenna can also work with circular polarization but has the only input for only one group of transmitters. An antenna supply scheme is proposed which allows two independent groups of transmitters to work simultaneously on one antenna with circular polarization and use all the advantages of the propagation of circular polarization radio waves in urban conditions and with mobile reception.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135754116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE PECULIARITIES OF OPTIMAL GROUPAGE CARGO ARRANGEMENT IN A SEMITRAILER ALGORITHM","authors":"S.M. ISAJEVA, E.A. SHOBANOV","doi":"10.36724/2072-8735-2023-17-6-54-60","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-6-54-60","url":null,"abstract":"This article dwells upon the peculiarities of optimal groupage cargo arrangement in a semitrailer algorithm. Nowadays it is quite important to optimize logistics processes due to high demand of this kind of service. The author describes a developing and designing process of special application that automatically arranges cargos in a semitrailer. The text gives valuable information referred to a semitrailer structure and logistics. It is spoken in detail about eight steps explaining the whole process of development. Much attention is given to one particular step explaining application operation in stages. Such an application is rather user friendly, so any logistics manager can use it without instructions. The solution is applicable to real use case with some final improvements towards compatibility with other systems and also this solution helps in speeding up some workflows in logistics services, so some funds can be saved. The exact amount of savings can differ from company to company due to individual internal structure. Summing up the results, it can be concluded that the solution is rather multipurpose, in other terms it can be applicable to multiple companies with some refinements due to specific company's requests.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135754114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}