Subjects -> COMMUNICATIONS (Total: 518 journals)
    - COMMUNICATIONS (446 journals)
    - DIGITAL AND WIRELESS COMMUNICATION (31 journals)
    - HUMAN COMMUNICATION (19 journals)
    - MEETINGS AND CONGRESSES (7 journals)
    - RADIO, TELEVISION AND CABLE (15 journals)

COMMUNICATIONS (446 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 480 Journals sorted alphabetically
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
McMaster Journal of Communication     Open Access   (Followers: 1)
Media & Jornalismo     Open Access  
Media & Viestintä     Open Access   (Followers: 1)
Media and Communication     Open Access   (Followers: 15)
Media International Australia     Hybrid Journal   (Followers: 4)
Mediaciones     Open Access  
Mediaciones Sociales     Open Access  
MediaTropes     Open Access   (Followers: 3)
Medical Writing     Hybrid Journal   (Followers: 4)
MedieKultur. Journal of media and communication research     Open Access   (Followers: 12)
Metaphor and the Social World     Hybrid Journal   (Followers: 2)
Middle East Journal of Culture and Communication     Hybrid Journal   (Followers: 5)
Middle East Media Educator     Open Access   (Followers: 2)
Myth & Symbol     Hybrid Journal   (Followers: 8)
Narrative Culture     Full-text available via subscription   (Followers: 3)
NAUS : Revista Lusófona de Estudos Culturais e Comunicacionais     Open Access   (Followers: 1)
Netcom     Open Access  
Neuroimaging Clinics of North America     Full-text available via subscription   (Followers: 4)
New Media and Mass Communication     Open Access   (Followers: 32)
New Review of Film and Television Studies     Hybrid Journal   (Followers: 27)
Nonprofit Communications Report     Hybrid Journal   (Followers: 3)
Nordic Journal of Media Management     Open Access   (Followers: 3)
Nordic Journal of Media Studies     Open Access   (Followers: 2)
Norsk medietidsskrift     Open Access  
Nueva Revista del Pacífico     Open Access  
Observatorio (OBS*)     Open Access  
Oficios Terrestres     Open Access  
Open Medical Informatics Journal     Open Access  
Pacific Asia Journal of the Association for Information Systems     Open Access   (Followers: 3)
Palabra Clave     Open Access   (Followers: 1)
Pediatric Radiology     Hybrid Journal   (Followers: 7)
Pixel-Bit. Revista de Medios y Educacion     Open Access  
Porn Studies     Hybrid Journal   (Followers: 6)
post(s)     Open Access  
Pragmatics and Society     Hybrid Journal   (Followers: 12)
PragMATIZES : Latin American Journal of Cultural Studies     Open Access   (Followers: 1)
PRISMA.COM     Open Access  
Proceedings of the American Society for Information Science and Technology     Hybrid Journal   (Followers: 26)
Public Journal of Semiotics     Open Access   (Followers: 1)
Public Relations Review     Hybrid Journal   (Followers: 15)
Punto Cero     Open Access  
Quaderni     Open Access  
Qualitative Research Reports in Communication     Hybrid Journal   (Followers: 11)
Qualitative Studies     Open Access   (Followers: 12)
Quality and User Experience     Hybrid Journal   (Followers: 6)
Quarterly Journal of Speech     Hybrid Journal   (Followers: 15)
Quarterly Review of Film and Video     Hybrid Journal   (Followers: 21)
Question     Open Access  
Questions de communication     Open Access  
Radioelectronics and Communications Systems     Hybrid Journal   (Followers: 1)
REDD : Revista de estudios del discurso digital     Open Access  
Research Journal of Information Technology     Open Access   (Followers: 2)
Review of Cognitive Linguistics     Hybrid Journal   (Followers: 6)
Revista Contracampo     Open Access  
Revista ECO-Pós     Open Access  
Revista Eletrônica de Comunicação, Informação & Inovação em Saúde     Open Access  
Revista Mediação     Open Access  
Revue de recherches en littératie médiatique multimodale     Open Access  
Revue française des sciences de l’information et de la communication     Open Access   (Followers: 2)
RIHC : Revista Internacional de Historia de la Comunicación     Open Access  
Russian Journal of Communication     Hybrid Journal  
Schermi. Storie e culture del cinema e dei media in Italia     Open Access  
Science China Information Sciences     Hybrid Journal   (Followers: 3)
Scientific Bulletin     Open Access   (Followers: 1)
Screen     Hybrid Journal   (Followers: 20)
Seminars in Interventional Radiology     Hybrid Journal   (Followers: 8)
Semiotika     Open Access  
Sensorium Journal     Open Access  
Seton Hall Journal of Sports and Entertainment Law     Open Access   (Followers: 3)
Sexualization, Media, & Society     Open Access   (Followers: 3)
SIGDOC Communication Design Quarterly     Full-text available via subscription   (Followers: 3)
Sign Language & Linguistics     Hybrid Journal   (Followers: 3)
Sign Language Studies     Full-text available via subscription   (Followers: 5)
Social Communication     Open Access   (Followers: 2)
Social Interaction : Video-Based Studies of Human Sociality     Open Access   (Followers: 2)
Social Networking     Open Access   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Sound Studies : An Interdisciplinary Journal     Hybrid Journal   (Followers: 3)
South African Journal of Communication Disorders     Open Access   (Followers: 1)
Speech, Language and Hearing     Hybrid Journal   (Followers: 16)
Studies in Asian Social Science     Open Access  
Technical Communication     Full-text available via subscription   (Followers: 7)
Telecommunication Systems     Hybrid Journal   (Followers: 4)
Terminology     Hybrid Journal   (Followers: 4)
The Communication Review     Hybrid Journal   (Followers: 5)
The Post     Open Access  
Tic & société     Open Access  
Tidsskrift for Medier, Erkendelse og Formidling     Open Access  
Tijdschrift voor Communicatiewetenschappen     Full-text available via subscription   (Followers: 4)
Transactions on Emerging Telecommunications Technologies     Hybrid Journal   (Followers: 4)
tripleC : Communication, Capitalism & Critique. Open Access Journal for a Global Sustainable Information Society     Open Access   (Followers: 9)
Trípodos     Open Access  
Turkish Review of Communication Studies     Open Access  
Ukrainian Information Space     Open Access  
University of Sindh Journal of Information and Communication Technology     Open Access  
Virtualidad, Educación y Ciencia     Open Access  
Vivat Academia     Open Access  
Wacana : Jurnal Sosial dan Humaniora     Open Access  
Women's Studies in Communication     Hybrid Journal   (Followers: 5)
ZER : Revista de Estudios de Comunicación = Komunikazio Ikasketen Aldizkaria     Open Access  

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Journal Cover
Radioelectronics and Communications Systems
Journal Prestige (SJR): 0.198
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0735-2727 - ISSN (Online) 1934-8061
Published by Springer-Verlag Homepage  [2468 journals]
  • Hybrid Spectrum Sensing Enhancement for Cognitive Radio in 6G Radio System

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      Abstract: This article highlights the potential advantages of the proposed hybrid algorithm for 6G. The algorithm’s adaptability addresses the dynamic spectral characteristics of 6G environments, enabling a seamless transition between different spectral conditions. The hybrid approach holds promise for enhancing spectrum utilization, reducing interference, and optimizing overall communication system performance. As 6G technology evolves, the integration of energy detection and cyclostationary spectrum sensing through the hybrid algorithm offers a glimpse into innovative techniques that can shape the future of wireless communication, unlocking the potential for enhanced connectivity, efficiency, and user experience. Several parameters such as the probability of detection (Pd), probability of false alarm (Pfa), bit error rate (BER), and power spectral density (PSD) are compared and analyzed with the conventional spectrum sensing algorithms. We see that the proposed hybrid algorithms obtain a substantial detection performance at the low signal-to-noise ratio (SNR).
      PubDate: 2023-05-01
       
  • Modern Diagnostic Imaging Classifications and Risk Factors for 6G-enabled
           Smart Health Systems

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      Abstract: The creation of smart healthcare systems is a viable strategy to improve the quality and availability of healthcare services. Identity theft, data breaches, and denial-of-service attacks are just some of the security concerns that have arisen as a result of connecting wireless networks and smart medical equipment. A secure and trustworthy smart healthcare system that can protect patient data and preserve the confidentiality of private medical information is especially important in light of these vulnerabilities. Medical diagnosis assumes increasing importance as the amount of data created daily in the 6G-enabled Internet-of-Medical Things (IoMT) grows exponentially. To enhance the anticipation accuracy and supply a real-time medicinal diagnosis, this research presents an approach integrated into the 6G-enabled IoMT that requires less human intervention for healthcare applications. To do this, the proposed system combines deep learning with optimization methods. MobileNetV3 architecture is then used to learn the features taken from each image. In addition, we improved the performance of the HGS-based arithmetic optimization algorithm (AOA). The operators of the HGS are used in the new approach, dubbed AOAHG, to improve the AOA operation capacity as the viable province is divided up. We design a 6G-enabled IoMT approach that requires fewer humans in healthcare settings but yields faster diagnostic results. The new approach was developed to be used in systems with limited means. The created AOAHG prioritizes the most important features and guarantees an overall upgrade in model categorization. When compared to other methodologies in the literature, the framework’s results were impressive. The created AOAHG also outperformed alternative FS methods in terms of the achieved accuracy, precision, recall, and F1-score. For instance, AOAHG had 92.12% accuracy with the ISIC dataset, 98.27% with the PH2 dataset, 95.24% with the WBC dataset, and 99.84% with the OCT dataset.
      PubDate: 2023-05-01
       
  • Evolution of Wireless Communication Networks from 5G to 6G: Future
           Perspective

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      Abstract: Industry 4.0 relies heavily on artificial intelligence (AI) and cloud computing (CC), both of which have been greatly aided by the 5-generation mobile network (5G). However, the arrival of 5G, is seen as a watershed moment that will radically alter the current global trends in wireless communication practices and the lives of the masses. 5G envisions a future where the digital and physical worlds merge. The 6th-generation (6G) wireless communication network will likely unite terrestrial, aerial, and maritime communications into a single, unified system that is both more stable and faster and can accommodate a far larger number of devices with ultra-low latency needs. The purpose of this research is to foresee a scenario in which 6G supersedes 5G as the dominant standard for wireless communication in the years to come. Several advances have been made, but the desired instantaneous global communication and computation with no latency has not arrived yet. In this paper, there are represented the most significant obstacles and difficulties that the transition from 5G to 6G can encounter on the way to realizing these loftier goals. The main purpose of “technology for humanity” is to improve service to the world’s most disadvantaged people, and this paper lays out a plan for 6G that includes the enabling technology infrastructures, obstacles, and research directions that will get us there.
      PubDate: 2023-05-01
       
  • Patch Antennas Based on Micro QR Codes

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      Abstract: The article proposes a new type of broadband patch antennas based on micro QR codes with integrated metamaterial cell as a marker. In this research, several design options were considered that used the variation of the metamaterial cell parameters. For their analysis, the numerical modeling methods of the Ansys EM Suite program were used due to the complexity of describing the interaction of antennas of non-Euclidean geometry with radio waves. Evaluation and comparison of proposed antennas was conducted by the following characteristics: amplitude-frequency response and voltage standing wave ratio. To expand the frequency band of the synthesized antenna has been implemented the split square marker is an element of micro QR. This approach enables the expansion of the relative bandwidth of the corresponding printed antenna to the value of 1.7267 under the condition of the continuous transmission band having a width of 167.935 GHz within the range from 13.29 to 181.225 GHz. In this case, cutouts of the split square marker are located along the line coaxial with the power supply line, and the cutout for the outer “ring” is located below. To synthesize micro QR code, the word “antenna” was used.
      PubDate: 2023-05-01
       
  • Analysis of Data Science and AI-enabled 6G Wireless Communication Networks

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      Abstract: Current networks (such as 4G and the forthcoming 5G networks) may not be capable of fully congregating quickly emerging traffic strains due to the proliferation of smart fatal, infrastructures and the explosion of diverse applications with varying necessities. As a result, 6G network research has already seen participation from both the private sector and the academic community. Recently, an innovative paradigm has emerged for the intelligent design and optimization of 6G networks based on the combination of artificial intelligence (AI) and data science (DS). Therefore, this article proposes an AI-enabled architecture for 6G networks, which is alienated into four layers: intelligent sensing, data analytics, intelligent control, and smart application, to realize patterns sighting, smart resource management, automatic network adjustment, and intelligent service provisioning. We go over the uses of DS&AI methods in 6G networks, such as AI-enhanced mobile edge computing, intelligent mobility, and smart-spectrum management, and how to implement these methods to maximize the network’s performance. We also emphasize key areas for future study and clarifications for AI-enabled 6G networks, together with computational efficiency, algorithm resilience, hardware development, and energy management.
      PubDate: 2023-05-01
       
  • Peak to Average Power Ratio Reduction Using Companding Algorithm for NOMA
           Waveform

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      Abstract: Future wireless communication systems can accommodate huge connections and improve spectrum efficiency by using the approach based on non-orthogonal multiple access (NOMA). High peak-to-average power ratio (PAPR) levels can, however, negatively affect NOMA, resulting in decreased system performance and more complicated power amplifiers. This study suggests PAPR reduction in NOMA by utilizing companding methods for 512, 256, and 64 sub-carriers to address this problem. The high peak power of NOMA signals may be effectively compressed by using nonlinear companding techniques, such as μ-law and A-law companding, which reduces distortion and improves overall system dependability. Simulations are used to assess the effectiveness of the suggested companding methods, and the findings show a significant reduction in PAPR assuring an increased bit error rate (BER) effectiveness and transmission resilience in NOMA-based communication systems. The suggested method is contrasted with the conventional A-law (C-A-Law) and μ-law (C-μ-law).
      PubDate: 2023-04-01
       
  • Effect of Penetrating Radiation on Sensitivity of Magnetotransistors

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      Abstract: An experimental study of the effect of radiation emissions (neutrons, gamma radiation) on the sensitivity of industrial bipolar n-p-n magnetotransistors has been carried out. It has been shown that neutron irradiation leads to defects in the structure, which reduces the effective lifetime of the injected charge carriers and decreases the magnetosensitivity. Gamma radiation with increasing intensity first destroys the surface structural defects and increases the lifetime of carriers and magnetoresponsiveness, and then penetrates deeper forming defects and reducing magnetoresponsiveness. This makes it possible to use gamma radiation with an intensity of up to 107 R as a technological method of increasing magnetosensitivity.
      PubDate: 2023-04-01
       
  • Steganographic Method with Code Control of Information Embedding Based on
           Multi-level Code Words

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      Abstract: Effective steganographic methods are an integral part of modern information security systems. At the same time, one of the key requirements for modern steganographic methods, taking into account their needed implementation on mobile and IoT devices, is their low resource consumption maintaining high perception reliability, throughput, and resistance to attacks against the embedded message. The steganographic method with code control of additional information embedding using multi-level code words is presented in this work. A new synthesis approach of multi-level code words with a high selectivity coefficient is developed. It allows us to ensure the specified properties of steganographic messages. Sets of multi-level code words of practically valuable sizes are synthesized and studied. Experimental studies of the effectiveness of the steganographic method with embedding code control based on the presented multi-level code words are conducted. They ensure a high level of its resistance to attacks against the embedded message, by compression, noise superimposing, and blurring, while ensuring sufficient bandwidth and perception reliability in practice.
      PubDate: 2023-04-01
       
  • Multiple Reflection Method in Problem of Constructive Synthesis of
           Polarizers and Phase Shifters Based on Three Non-dissipative
           Inhomogeneities in Waveguide

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      Abstract: The paper presents the results of developing an analytical method for constructive synthesis of waveguide polarizers and phase shifters based on three non-dissipative inhomogeneous elements. The analytical synthesis of such devices was carried out based on solving the problem of electromagnetic wave propagation in a waveguide segment with three non-dissipative inhomogeneities by the method of multiple reflections in the single-wave approximation. The proposed approach allowed us to obtain a clear physical substantiation of the mathematical formulation of conditions for the analytical synthesis of polarizers and phase shifters based on three non-dissipative inhomogeneities in a waveguide. As a result, simple formulas have been obtained that determine the parameters of phase-shifting elements and the electrical distance between them, at which there are no reflections and the desired phase shift is provided. The constructive synthesis of a polarizer is based on the conditions of equality of the required and real admittances of the reactive elements in the waveguide and their derivatives at the central frequency of the operating frequency range. As a result, the optimal geometric dimensions of the device structure were determined. As a result, the optimal geometric dimensions of the device structure are determined. It is shown that a polarizer based on three pins in a square waveguide can provide an operating frequency bandwidth of 10% with electromagnetic energy reflection of less than 1% and a differential phase shift of Δφ = 90° ± 1°, and an operating frequency bandwidth of up to 18% with an admissible reflection of 10% of energy and a differential phase shift of Δφ = 90° ± 2°. The theoretical results are confirmed by high-precision electrodynamic simulation and by experiments on the manufactured prototype of the original controlled X-band polarizer with the maximally flat phase-frequency characteristic based on three symmetrical metal pins inserted into a circular waveguide. The developed analytical method for the constructive synthesis of waveguide polarizers based on three inhomogeneities is intended both for independent use and for obtaining initial values of dimensions of the polarizing device to radically accelerate the search for a global extremum in the process of multiparameter optimization in the high-precision constructive synthesis of such a device at the electrodynamic level, taking into account higher types of waves and the interaction between inhomogeneities on higher types of waves.
      PubDate: 2023-04-01
       
  • Analysis of Complex Linear Periodically Time-Varying Circuits by Method of
           Reduced Matrix D-Trees

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      Abstract: The paper proposes the method of reduced matrix D-trees, which is an improved version of the method of matrix d-trees. This method is a further development of the application of one of the subcircuit methods, the so-called d-tree method, to the symbolic analysis of linear circuits with constant parameters The method of reduced matrix D-trees, like the d-tree method, provides a significant reduction in the required computer time for modeling circuits, which has a mathematical meaning, consisting in the bringing out of similar terms in the formed complex symbolic expressions. Since there are, in fact, many symbolic terms in such expressions, this reduction in time is due to such factoring. The method is illustrated using a model of a long line consisting of a cascade connection of a large number of elementary links. The results of the computer simulation are also presented.
      PubDate: 2023-04-01
       
  • 5G Rollout Challenges and Opportunities for Frontier and Emerging Markets

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      Abstract: Cost efficiency is an essential metric in the design of major part of what is expected to be the 5G network. Some of the 5G solutions, mainly those involving mmWave technology and network densification, are extremely expensive. Much of what was said about 5G rollout strategies has been said with regard to the world’s major leaders in 5G technology and telecom infrastructure investment. However, a much more numerous group of countries often referred as emerging markets or middle-income economies has never hold a leadership in the development of cellular technologies. To date, few of them have fully leveraged the potential of 4G systems while many still have not ensured a return on investment in 3G. This gave rise to the views that these countries are not ready for 5G challenges. However, all of them are doomed to enter the era of another industrial revolution, where exactly 5G is to become the main driver. Yet, the use cases and the portfolio of services of the future networks will apparently depend on economic realities of the country where it will be deployed. There is a rather vague picture at the moment of how the 5G rollout may take place in this part of the world and that is the main reason for this study. In this paper, we outline the technical challenges and economic tensions associated with the developing of 5G physical infrastructure and address spectrum allocation issues with a particular focus on the needs of the future enhanced mobile broadband component. Then we discuss the role of government in establishing favorable regulatory framework, providing supportive policies and finding local drivers to facilitate 5G rollout and the challenges, confronting the operators paving their way to 5G.
      PubDate: 2023-03-01
      DOI: 10.3103/S0735272723040040
       
  • Comparative Study of Block Ciphers Implementation for Resource-Constrained
           Devices (Review)

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      Abstract: Lightweight cryptography (LWC) is critical for securing data between devices with limited resources. In this paper, we consider hardware-based block ciphers (BC). The BCs are thoroughly described using the substitution permutation network (SPN) and Feistel network (FN) structures. A detailed summary of each SPN and FN-based BC is provided. Furthermore, the paper compares and thoroughly analyses the performance analysis of modern SPN and FN-based BCs. For each block cipher, performance measures such as chip area (slices), frequency, latency, throughput, and hardware efficiency are reviewed. The paper also recommends appropriate ciphers for the greatest and lowest performance indicators. Among BCs, the PRINCE cipher has minimal latency and great throughput. The research also reveals that the LED and PRESENT ciphers are more compact than other ciphers. The open research challenges are also presented with a forward-looking perspective.
      PubDate: 2023-03-01
      DOI: 10.3103/S0735272723050011
       
  • Deep Learning Framework for Analysis of Health Factors in
           Internet-of-Medical Things

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      Abstract: The introduction of IoT technologies, such as those used in remote health monitoring applications, has revolutionized conventional medical care. Furthermore, the approach utilized to obtain insights from the scrutiny of lifestyle elements and activities is crucial to the success of tailored healthcare and disease prevention services. Intelligent data retrieval and classification algorithms allow for the investigation of disease and the prediction of aberrant health states. The convolutional neural network (CNN) strategy is utilized to forecast such anomaly because it can successfully recognize the knowledge significant to disease anticipation from amorphous medical heath records. Conversely, if a fully coupled network-topology is used, CNN guzzles a huge memory. Furthermore, the complexity analysis of the model may rise as the number of layers grows. Therefore, we present a CNN target recognition and anticipation strategy based on the Pearson correlation coefficient (PCC) and standard pattern activities to address these shortcomings of the CNN model. It is built in this framework and used for classification purposes. In the initial hidden layer, the most crucial health-related factors are chosen, and in the next, a correlation-coefficient examination is performed to categorize the health factors into positively and negatively correlated groups. Mining the occurrence of regular patterns among the categorized health parameters also reveals the behavior of regular patterns. The model output is broken down into obesity, hypertension, and diabetes-related factors with known correlations. To lessen the impact of the CNN-typical knowledge discovery paradigm, we use two separate datasets. The experimental results reveal that the proposed model outperforms three other machine learning techniques while requiring less computational effort.
      PubDate: 2023-03-01
      DOI: 10.3103/S0735272723030056
       
  • Enhancing Peak Power Efficiency of NOMA Waveform for 5G and beyond 5G
           Using SLM Algorithm

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      Abstract: The paper presents a novel approach for mitigating the detrimental effects of the high peak-to-average power ratio (PAPR) inherent in non-orthogonal multiple access (NOMA) waveforms using the selective mapping (SLM) technique. NOMA, a prominent multiple access scheme in modern wireless communication systems, facilitates concurrent transmission of multiple users over the same time-frequency resource. However, NOMA is susceptible to elevated PAPR, causing efficiency degradation and inter-symbol interference. The proposed method leverages SLM to address the PAPR challenges in NOMA waveforms. By generating a set of diverse phase sequences, SLM constructs alternative versions of the original NOMA signal. The phase sequence resulting in the lowest PAPR is then selected for transmission. This dynamic adaptation significantly reduces peaks in the transmitted signal, thereby enhancing efficiency, minimizing distortion, and reducing the risk of nonlinear amplification. Extensive simulations are conducted to evaluate the efficiency of the projected procedure. The results demonstrate remarkable PAPR reduction in NOMA waveforms compared to conventional transmission methods. Additionally, the method maintains signal quality, improving the Bit Error Rate (BER), power spectral density (PSD) and enhancing the overall reliability of the radio framework. The paper concludes with insights into the feasibility of integrating SLM into existing NOMA-enabled systems, offering a promising avenue for optimizing the efficacy of advanced radio networks.
      PubDate: 2023-03-01
      DOI: 10.3103/S0735272723050035
       
  • Thyristors Controlled by Light and Magnetic Field

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      Abstract: In this paper an impact of external magnetic field on current-voltage characteristics of a planar silicon photothyristor is researched experimentally. It is shown that magnetic field of one polarity with induction of 0.4 T results in such decrease of the breakover voltage UB as well as an LED emission at current of 8 mA. But magnetic field of the opposite polarity allows to increase UB. There are represented the formulas for calculation of the dependence of UB on magnetic field. Increase of magnetic sensitivity is achieved by placement of the area with high rate of injected charge carriers recombination at the opposite side of the electrodes at the base side. Double contactless control of the thyristor UB with light and magnetic field allows to increase essentially its functional possibilities. Since the thyristor can only be turned on by light emission, it can also be turned off by the magnetic field impact. It is shown that existing industrial optical couplers can be used as optrons controlled with light emission and magnetic field, but magnetic control thyristor can be used as a simple switch.
      PubDate: 2023-02-01
      DOI: 10.3103/S0735272723010053
       
  • Theoretical Justification of Application Possibility of Different Order
           Root-polynomial Functions for Interpolation and Approximation of Boundary
           Trajectory of Electron Beam

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      Abstract: In this paper on a basis of functional analysis methods we justified theoretically the possibility of different orders root-polynomial functions application for interpolation and approximation of the boundary trajectory of an electron beam in case of its propagation in ionized gas with compensation of the space charge of the beam electrons. It is shown, that the root-polynomial functions satisfy to the second-order differential equation, describing the boundary trajectory of the beam electrons under such physical conditions. The results of interpolation and approximation of the boundary trajectory of the electron beam by root-polynomial functions from the second to the fifth order under the following physical conditions are presented. The interpolation results are compared with the corresponded results of the differential equation solution for the boundary trajectory of the electron beam using Runge-Kutta numerical method of the fourth order. These results are considered as reference ones for the interpolation task. To solve the approximation problem, in this paper an iterative algorithm based on the calculation of both values of the function and its derivatives at reference points is proposed. The approximation task is solved for a sample of numerical data obtained by experimental electron-beam equipment for real processes of current electron-beam technologies, which led to a rather large value of the experimental measurement error due to the effect of random factors associated with thermal treatment of products with electron beam. Test calculations show that the error of interpolation and approximation of numerical data, describing the boundary trajectory of electron beam in case of its propagation in ionized gas, does not exceed a few percent. The theoretical and practical results obtained in this paper are interesting for a wide range of specialists who are engaged in the physics of electron beams, the development of electron-beam technological equipment and implementation of current electron-beam technologies into industry.
      PubDate: 2023-02-01
      DOI: 10.3103/S0735272723020024
       
  • Broadband Acousto-optic Amplitude Demodulator

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      Abstract: The scientific and practical significance of the synthesis of demodulators in solving the problem of monitoring unknown radio emissions has been substantiated. Features of the photoelastic effect are discussed in the context of constructing an amplitude demodulator. A mathematical model of the signal generation process at the output of the demodulator has been developed. It is shown that the output signal of this model is a copy of the information contained in the radio signal at the input of demodulator. In this case, the amplitude demodulator also performs the function of a low-pass filter with a characteristic cutoff frequency. A method for calculating the demodulator cutoff frequency based on the transient response is proposed. A breadboard of acousto-optic amplitude demodulator based on Bragg’s cell with the central frequency of 80 MHz has been created. A number of experimental studies were conducted to verify the established concepts. The demodulation processes of signals with amplitude and pulse modulation were considered. It has been proved by experiment that the acousto-optic amplitude demodulator reproduces information with accuracy sufficient for practice. An example of determining the cutoff frequency of acousto-optic amplitude demodulator by employing the shape of the output pulse is presented.
      PubDate: 2023-02-01
      DOI: 10.3103/S0735272723030032
       
  • Temperature Drift of Silicon Photodiode Spectral Sensitivity

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      Abstract: The spectral sensitivity change of a silicon photodiode with its temperature is analyzed in the article. This research area is relevant because silicon photodiodes are used as sensitive elements in temperature control systems of the vapour-phase epitaxy process. Technical characteristics of the obtained semiconductor devices are mostly determined by the quality of heterostructures used for their manufacture. The optical pyrometry method is used for the surface temperature precise control of the A3B5 solid solutions active layers during metalorganic chemical vapour deposition (MOCVD). Since the surface relief and parameters during deposition change significantly, classical pyrometry leads to significant measurement errors, so the pyrometry method with radiation compensation is used. This method combines the wafer surface radiation measurement and its reflectivity. This allows to determine the surface temperature true value, the layer thickness and the heat distribution uniformity on the wafer in real time. However, for high precision, it is necessary to take into account the temperature coefficient of the silicon photodiode ampere-watt sensitivity change. The basics of MOCVD technology are discussed in this article. The features of the epitaxy process in the reactor with high-precision temperature control are highlighted. The analytical and empirical study of change in silicon photodiode ampere-watt sensitivity and its effect on measurement accuracy are given. The research results improve the accuracy of real temperature measurement using pyrometric parameter control systems in MOCVD technology and help to understand and to take into account the influence of temperature factors on measurement accuracy to improve this technology.
      PubDate: 2023-02-01
      DOI: 10.3103/S073527272302005X
       
  • Transmit Antenna Selection for Achieving Energy Efficiency in Massive MIMO
           Based 5G Cellular Network

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      Abstract: In this study, two dynamic algorithms are verified for transmit antenna selection aimed at achieving the energy efficiency in massive MIMO, namely: Random User Selection (RUS) and Maximum Channel Gain (MCG). Massive MIMO setups are investigated over N radio cables via centralized massive base station (BS), which uses RUS and MCG to provide management to U clients. Massive MIMO networks are shown for 8×8, 16×16, 25×25, and 50×50 setups using RUS and MCG. The proficiency of the proposed scheme on setup network has been investigated with RUS and MCG, and then the effect on performance characteristics, such as sumrate, user throughput and energy efficiency has been analyzed. The power efficiency has also been improved by increasing the number of Massive MIMO antennas. Compared to RUS, algorithm MCG provides a better service to users located far from the base station antenna.
      PubDate: 2023-02-01
      DOI: 10.3103/S0735272723020048
       
  • Microwave Absorbing Composite Materials

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      Abstract: Designing of microwave systems based on composite materials involves the need of thorough understanding of interaction processes of electromagnetic waves with such materials and factors that affect this interaction. Polymer-based composites filled with materials having a high degree of electromagnetic energy absorption make it possible to combine electric properties of composite material with the mechanical elasticity, chemical resistance, and good fabrication properties. Selecting materials and their processing techniques, it is possible to achieve the required properties, both electrodynamic and mechanical. Composite properties are essentially influenced by such factors as the size and shape of filler particles, the volume fraction of filler, etc. Therefore, this paper considers different types of fillers for producing polymer-based composites, namely, magnetic materials, metals, carbon, and dielectrics with high dielectric permittivity. Advantages and disadvantages of the above fillers are analyzed. It has been shown that in the millimeter wavelength range, the relevent composites are those, in which the absorption is implemented due to the inclusion of polar dielectrics into their composition.
      PubDate: 2023-01-01
      DOI: 10.3103/S0735272723010065
       
 
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  Subjects -> COMMUNICATIONS (Total: 518 journals)
    - COMMUNICATIONS (446 journals)
    - DIGITAL AND WIRELESS COMMUNICATION (31 journals)
    - HUMAN COMMUNICATION (19 journals)
    - MEETINGS AND CONGRESSES (7 journals)
    - RADIO, TELEVISION AND CABLE (15 journals)

COMMUNICATIONS (446 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 480 Journals sorted alphabetically
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
McMaster Journal of Communication     Open Access   (Followers: 1)
Media & Jornalismo     Open Access  
Media & Viestintä     Open Access   (Followers: 1)
Media and Communication     Open Access   (Followers: 15)
Media International Australia     Hybrid Journal   (Followers: 4)
Mediaciones     Open Access  
Mediaciones Sociales     Open Access  
MediaTropes     Open Access   (Followers: 3)
Medical Writing     Hybrid Journal   (Followers: 4)
MedieKultur. Journal of media and communication research     Open Access   (Followers: 12)
Metaphor and the Social World     Hybrid Journal   (Followers: 2)
Middle East Journal of Culture and Communication     Hybrid Journal   (Followers: 5)
Middle East Media Educator     Open Access   (Followers: 2)
Myth & Symbol     Hybrid Journal   (Followers: 8)
Narrative Culture     Full-text available via subscription   (Followers: 3)
NAUS : Revista Lusófona de Estudos Culturais e Comunicacionais     Open Access   (Followers: 1)
Netcom     Open Access  
Neuroimaging Clinics of North America     Full-text available via subscription   (Followers: 4)
New Media and Mass Communication     Open Access   (Followers: 32)
New Review of Film and Television Studies     Hybrid Journal   (Followers: 27)
Nonprofit Communications Report     Hybrid Journal   (Followers: 3)
Nordic Journal of Media Management     Open Access   (Followers: 3)
Nordic Journal of Media Studies     Open Access   (Followers: 2)
Norsk medietidsskrift     Open Access  
Nueva Revista del Pacífico     Open Access  
Observatorio (OBS*)     Open Access  
Oficios Terrestres     Open Access  
Open Medical Informatics Journal     Open Access  
Pacific Asia Journal of the Association for Information Systems     Open Access   (Followers: 3)
Palabra Clave     Open Access   (Followers: 1)
Pediatric Radiology     Hybrid Journal   (Followers: 7)
Pixel-Bit. Revista de Medios y Educacion     Open Access  
Porn Studies     Hybrid Journal   (Followers: 6)
post(s)     Open Access  
Pragmatics and Society     Hybrid Journal   (Followers: 12)
PragMATIZES : Latin American Journal of Cultural Studies     Open Access   (Followers: 1)
PRISMA.COM     Open Access  
Proceedings of the American Society for Information Science and Technology     Hybrid Journal   (Followers: 26)
Public Journal of Semiotics     Open Access   (Followers: 1)
Public Relations Review     Hybrid Journal   (Followers: 15)
Punto Cero     Open Access  
Quaderni     Open Access  
Qualitative Research Reports in Communication     Hybrid Journal   (Followers: 11)
Qualitative Studies     Open Access   (Followers: 12)
Quality and User Experience     Hybrid Journal   (Followers: 6)
Quarterly Journal of Speech     Hybrid Journal   (Followers: 15)
Quarterly Review of Film and Video     Hybrid Journal   (Followers: 21)
Question     Open Access  
Questions de communication     Open Access  
Radioelectronics and Communications Systems     Hybrid Journal   (Followers: 1)
REDD : Revista de estudios del discurso digital     Open Access  
Research Journal of Information Technology     Open Access   (Followers: 2)
Review of Cognitive Linguistics     Hybrid Journal   (Followers: 6)
Revista Contracampo     Open Access  
Revista ECO-Pós     Open Access  
Revista Eletrônica de Comunicação, Informação & Inovação em Saúde     Open Access  
Revista Mediação     Open Access  
Revue de recherches en littératie médiatique multimodale     Open Access  
Revue française des sciences de l’information et de la communication     Open Access   (Followers: 2)
RIHC : Revista Internacional de Historia de la Comunicación     Open Access  
Russian Journal of Communication     Hybrid Journal  
Schermi. Storie e culture del cinema e dei media in Italia     Open Access  
Science China Information Sciences     Hybrid Journal   (Followers: 3)
Scientific Bulletin     Open Access   (Followers: 1)
Screen     Hybrid Journal   (Followers: 20)
Seminars in Interventional Radiology     Hybrid Journal   (Followers: 8)
Semiotika     Open Access  
Sensorium Journal     Open Access  
Seton Hall Journal of Sports and Entertainment Law     Open Access   (Followers: 3)
Sexualization, Media, & Society     Open Access   (Followers: 3)
SIGDOC Communication Design Quarterly     Full-text available via subscription   (Followers: 3)
Sign Language & Linguistics     Hybrid Journal   (Followers: 3)
Sign Language Studies     Full-text available via subscription   (Followers: 5)
Social Communication     Open Access   (Followers: 2)
Social Interaction : Video-Based Studies of Human Sociality     Open Access   (Followers: 2)
Social Networking     Open Access   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Sound Studies : An Interdisciplinary Journal     Hybrid Journal   (Followers: 3)
South African Journal of Communication Disorders     Open Access   (Followers: 1)
Speech, Language and Hearing     Hybrid Journal   (Followers: 16)
Studies in Asian Social Science     Open Access  
Technical Communication     Full-text available via subscription   (Followers: 7)
Telecommunication Systems     Hybrid Journal   (Followers: 4)
Terminology     Hybrid Journal   (Followers: 4)
The Communication Review     Hybrid Journal   (Followers: 5)
The Post     Open Access  
Tic & société     Open Access  
Tidsskrift for Medier, Erkendelse og Formidling     Open Access  
Tijdschrift voor Communicatiewetenschappen     Full-text available via subscription   (Followers: 4)
Transactions on Emerging Telecommunications Technologies     Hybrid Journal   (Followers: 4)
tripleC : Communication, Capitalism & Critique. Open Access Journal for a Global Sustainable Information Society     Open Access   (Followers: 9)
Trípodos     Open Access  
Turkish Review of Communication Studies     Open Access  
Ukrainian Information Space     Open Access  
University of Sindh Journal of Information and Communication Technology     Open Access  
Virtualidad, Educación y Ciencia     Open Access  
Vivat Academia     Open Access  
Wacana : Jurnal Sosial dan Humaniora     Open Access  
Women's Studies in Communication     Hybrid Journal   (Followers: 5)
ZER : Revista de Estudios de Comunicación = Komunikazio Ikasketen Aldizkaria     Open Access  

  First | 1 2 3 | Last

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JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


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