bluuebunny/crossref_metadata_2025 huggingface dataset:
Knowledge and perception towards COVID-19 vaccination among health care workers at a tertiary care centre
Authors: Pant Subash , Shrestha Prinsa , Acharya Rajat , KC Mathura
Published: March 2023

Background: Coronavirus disease 2019 (COVID-19) has caused an enormous impact on the health care system. The most effective way of controlling infectious diseases like COVID-19 is often vaccination. Health care workers have a key role in reducing the burden of the pandemic, role modeling preventive behaviours, and helping to vaccinate others. Objective: The aim of the study was to find the knowledge, and perception towards COVID-19 vaccination among health care workers. Methods: A descriptive cross-sectional study was conducted at Kathmandu Medical College Teaching Hospital from 1st June 2021 to 30th June 2021. Ethical clearance was taken from the institutional review committee (Ref. 2005202101). Convenience sampling was done. All the health care workers of the hospital who provided consent for the study were included in the study. Collected data were entered and analysed using SPSS v.24. Results: In this study, 270 health care workers were included, out of which 90 (33.3%) were male and 180 (66.7%) were female. The majority (176, 65.2%) of the health care workers got vaccinated to boost their immunity. The most common factor causing COVID-19 vaccine hesitancy in health care workers initially was the safety of the vaccine (133, 49.3%). Conclusion: The majority of the participants had good knowledge and positive perception of the COVID-19 vaccines. It demonstrates the need for effective education and communication designed to enhance knowledge about the COVID-19 vaccine and to teach vaccine counselling skills to the health care workers.
ecografía de glándulas salivales en el diagnóstico del síndrome de Sjögren
Authors: Avendaño Rodriguez Diego Ernesto , Torres Castiblanco John Leonardo , Villamizar Barahona Ana Beatriz , Burbano Burbano Hernán Darío , Rojas Villaraga Adriana , Polo José Fernando , Escobar Trujillo Alejandro
Published: March 2023

Objetivo: describir los hallazgos ecográficos en las glándulas salivares para el diagnóstico del síndrome de Sjögren primario. Metodología: se realizó una revisión narrativa de la literatura, con búsqueda en bases de datos seleccionando los principales artículos de revisión e investigaciones originales en español e inglés publicados en los últimos 20 años. Resultados: los hallazgos confirman el valor diagnóstico de la ecografía como estudio no invasivo de las glándulas salivares. Conclusión: la ecografía de glándulas salivares es un método útil y confiable para el diagnóstico del síndrome de Sjögren.
Quimioterapia en linfoma y su estrecha relación con el virus de la inmunodeficiencia humana /síndrome de inmunodeficiencia adquirida
Authors: Matute Mizger Vanesa , Martínez Sánchez Lina Maria
Published: March 2023

El virus de la inmunodeficiencia humana (VIH) ha estado en nuestra sociedad durante muchos años y los casos han aumentado con el paso del tiempo. La inmunosupresión y el síndrome de inmunodeficiencia adquirida (SIA) predisponen en gran parte al desarrollo de diferentes enfermedades, como el linfoma. Objetivo: realizar una revisión acerca de la quimioterapia en el linfoma asociado con el virus de la inmunodeficiencia humana y el síndrome de inmunodeficiencia adquirida, y su predisposición a sufrir más enfermedades oportunistas. Métodos: se realizó una revisión de la literatura en las bases de datos PubMed y ScienceDirect, con los descriptores “infecciones”, “linfoma”, “neoplasias”, “quimioterapia”, “serodiagnóstico del SIDA”, en inglés y español, seleccionando 10 artículos relacionados. Conclusión: la inmunosupresión que genera este virus puede predisponer en gran medida al desarrollo de muchas neoplasias en especial el linfoma. A pesar de que la quimioterapia es el tratamiento más efectivo en este tipo de pacientes, exacerba la condición de base de las personas y los hace más susceptibles a padecer infecciones oportunistas, las cuales pueden empeorar su situación, considerando así la quimioterapia como un factor de riesgo.
A Mirror for Each Other
Authors:   Concordia University of Edmonton, Canada, Taki Victor
Published: March 2023

Neither Russia nor Turkey can afford to deal alone with a consolidated Western alliance. To remain sovereign geopolitical actors, the two countries need each other, as do all states that seek to play an independent role in world politics.
Supremacy of Ostensibility
Authors:   National Research University–Higher School of Economics, Moscow, Russia, Malyavin V.V. , Kazantsev A.Ye. ,   National Research University–Higher School of Economics, Moscow, Russia
Published: March 2023

Contrary to Western sovereignty, which implies the homogeneity of its carrier, China proposes “unity in diversity,” a space of “Chinese characteristics” that opens up prospects for life in informal compatibility. In this sense, sovereignty cannot even be jeopardized.
Step Beyond Global World
Authors:   National Research University–Higher School of Economics, Moscow, Russia, Yevstafiev D.G.
Published: March 2023

Neo-globality dialectically integrates global de-universalization and regional economic, political, and cultural structuring. The latter allows extremely tough methods.
Historical perspective of a nuclear power plant at risk in a war zone
Authors: Sajo-Bohus L. , López J. A. , Castro-colin Miguel
Published: March 2023

The past seven decades the design and structural material of nuclear installations has improved and their safety precludes the possibility of severe accidents in GEN-III and III⁺ nuclear power plants (NPP). Zaporizhzhya GEN-III⁺-NPP (Ukraine), is used as subject of discussion. This NPP suffered a military attack this 2022. We discuss the possibility of a severe nuclear accident and the release of radioactive material, as a consequence of an adverse structural damage. Clearly, damage to a GEN-II, -III⁺ reactor dome by military ordnance can only be estimated from data gained during past nuclear accidents in a war zone, or in the neighborhood of military targets. We report historical experiences of reactors in a war zone or under direct military attack. Based on the available data we will discuss possible scenarios applicable to a nuclear installation in Ukraine. The concrete containment of buildings protecting the nuclear vessel and its LEU-fuel loaded core, are not designed to withstand military attacks. We will discuss possible consequences of a severe structural damage due to weaponry. Estimations will be made considering the VVER-1000 Zaporizhzhya ZNPP, class GEN-III+ built near the city of Enerhodar, Ukraine. This reactor has a 2m-plus-steel-reinforced containment. It is also discussed that spent-fuel temporal reservoirs in war zones, are higher-risk structures with higher likelihood of severe radioactive material release than NPP reactors.
Pengembangan Alat Hand Sanitizer Otomatis dengan Metode Research and Development Untuk Menjaga Kesehatan
Authors: Herfandi Herfandi , Ginanta Gilang , Purwirawansyah Eko , Prihandani Kamal
Published: March 2023

Covid-19 is the type of virus that causes the disease SARS-CoV-2. The government has implemented policies to prevent the spread of Covid-19, one of which is to wash hands regularly using hand sanitizer. However, the use of hand sanitizers is currently still widely applied manually, namely by pressing the pump lever on the hand sanitizer. Therefore, it is important to develop an automatic hand sanitizer. The research and development (R & D) method is able to create a product that has a high validity value because it goes through a series of testing and validation stages. This research is developing an automatic hand sanitizer with research and development methods. The result of this research is an automatic hand sanitizer device based on the Arduino Uno microcontroller with two servo motors as the driving force for the hand sanitizer and an ultrasonic sensor as input. The tools developed were proven to be more effective than manual tools based on a wider test with the percentage of manual tools being 50.00% and automatic hand sanitizers being 88.33%. Automatic hand sanitizer is expected to be able to maintain current health.
Pengaruh nilai K-value dan Penambahan Filler terhadap Kualitas Kulit Sintetis berbasis Polivinil Klorida
Authors: Syabani Muh. Wahyu , Amaliana Ina , Yuniarti Yuniarti
Published: March 2023

Synthetic leather is generally made using polyvinyl chloride or polyurethane resins by coating method. The balance between quality and production costs of the final product is influenced by the selection of the right material composition. Polyvinyl chloride resins are available in a variety of k-values, while fillers are often added to modify mechanical characteristics and lower the costs. The aim of this study was to examine the effect of the k-value of polyvinyl chloride blend and the amount of filler on the quality of synthetic leather. Plastisol is prepared by mixing resin, primary plasticizer, secondary plasticizer, and stabilizer according to the formulation. PVC resin blend with different k-values and certain amount of filler (10, 20, 30 and 40 phr) were used. The quality of the samples was tested using adhesion strength, tensile strength, and elongation at break testing according to ASTM D751-06. The results showed that resins blend with different k-values could be used to obtain the desired quality. The value of the adhesion strength, tensile strength and elongation at break will approach the characteristics of the larger part of the resin. The homogeneity of plastisol because of resin blend also needs attention, especially if the k-value difference between two resin is too large. Meanwhile, the use of calcium carbonate as filler in general will reduce the test results obtained.
Marketing Digitalization in Micro, Small, and Medium Enterprises (MSMEs) of Pamekasan Regency in Post-Pandemic
Authors: Rahman Fadali , Sudarmiatin Sudarmiatin , Hermawan Agus
Published: March 2023

Digitalization is a process of moving a business model that was originally used manually toward digital. While digital marketing or digital marketing is a form of business promoting and marketing a brand or brands using digital media such as the internet. The purpose of this study was to find out the use of digital marketing in post-pandemic Pamekasan Regency SMEs. This research method uses descriptive quantitative analysis with data collection techniques using a questionnaire. Respondents in this study were Pamekasan Regency MSMEs engaged in the food and beverage sector with a total sample of 45 MSMEs. The data analysis process uses editing, coding, tabulation, and data analysis.
The Influence of Lean Management on Work Effectiveness and Efficiency and Their Impact on Organizational Performance with Work Environmental as Moderating Variables in Manufacturing Companies
Authors: Apriyani Dessy
Published: March 2023

Humans as social beings always need the help of others to do something and achieve their goals, so humans tend to form groups or organizations to work together to achieve their primary goals. This study aims to determine the effect of lean implementation on work effectiveness and efficiency and its impact on organizational performance moderated by the work environment and conducted using a quantitative approach with employees from four manufacturing companies in Cikarang as research respondents. The number of respondents, as many as 100 is determined based on the number of indicators used. The number of indicators used is 20. The sampling technique is random sampling. The results of the research conducted, it can be seen that communication has a significant positive effect on work effectiveness and efficiency (0.179), communication has a significant positive effect on organizational performance (0.268), coordination has a significant positive effect on work effectiveness and efficiency (0.194), coordination does not have influence on organizational performance (-0.154), work effectiveness and efficiency have a significant positive effect on organizational performance (0.654), planning has a significant positive effect on work effectiveness and efficiency (0.192), planning has no effect on organizational performance (-0.016), resource allocation has significant positive effect on work effectiveness and efficiency (0.209), resource allocation has no effect on organizational performance (-0.014), Structure and Integration has a significant positive effect on work effectiveness and efficiency (0.325), Structure and Integration has a significant negative effect fikan on organizational performance (-0.137), work environment has a significant positive effect on organizational performance (0.358), work environment cannot moderate the effectiveness and efficiency of work on organizational performance (0.567).
Improving The Performance of MSMEs Affected by The Covid-19 Pandemic in Terms of Aspects of Marketing Strategies Mediated by Technology
Authors: Nainggolan Nana Triapnita , Lie Darwin , Ekana Nainggolan Lora , Pandapotan Silitonga Hery , Tua Siregar Robert
Published: March 2023

The Asian Development Bank examined how the pandemic affected MSMEs in Indonesia and found that 88% of these businesses had run out of cash or savings and that more than 60% of these MSEs had cut staff. Due to COVID-19’s consequences, global supply networks are now more susceptible to disruption due to limitations in numerous neighboring locations, a drop in commodity prices, and a higher danger of a global economic disaster. It utilizes quantitative research techniques in this investigation. SmartPLS and SEM analyses were used in this investigation. The results of the study show that marketing strategies, with technology serving as a mediator, have a positive and significant influence on MSMEs’ performance in the food business. It indicates that MSMEs players, particularly those in the food business, have had to modify their marketing strategies as a result of the ecosystem changes brought on by the outbreak. Therefore, improving MSMEs’ performance in the food sector both during and after the Covid-19 epidemic is one method to avoid the MSMEs sector from entering a condition of suspended animation. This demonstrates that the research’s findings suggest that certain elements of marketing strategy may help MSMEs perform better during the Covid 19 pandemic.
The Influence of Promotions, Products and Costs on The Decision Making
Authors: Anwar Khoirul , Suyitno Suyitno , Afifah Umi Nur , Idrus Imriani , Rahayu Sri
Published: March 2023

Decision-making will be influenced by information about interesting information, quality products, and affordable education costs to create someone’s direction and enthusiasm in pursuing higher education so that with this it can help a school institution in increasing the number of students and the services provided to their customers. The research was conducted with the aim to find out how the influence of promotions, products, and education costs on the decision-making of choosing a school. It used a quantitative method with the help of the IBM SPSS version 25 application, tested the validity and reliability of the research instrument, sampling technique used the saturated sample method which took all the population to be sampled, and data collection using a questionnaire. The results of this study indicate that the promotion variable (X1) has an influence on decision-making (Y1), and the product variable (X2) has an influence on decision-making (Y1). It can be seen based on the results of testing the t-test hypothesis where tcount>ttable (2.854 > 1.980) and a significant level that is less than 0.05 (0.024 <0.05), the variable cost of education (X3) has an influence on decision making (Y1).
Analysis of PT XYZ's Legitimation Crisis and Sustainability Strategy Due to Land Conflict with Communities
Authors: Emalia Deasy , Shauki Elvia R.
Published: March 2023

This study aims to analyze the crisis of legitimacy and sustainable development of PT XYZ due to land conflicts with the community, by using legitimacy theory as a basis in helping to analyze by giving meaning to the data findings from research results on the influence of land conflicts on the company's legitimacy and sustainable development. This study uses a case study research strategy and a qualitative research approach, using a single unit analysis, namely PT XYZ. The research method used in this study uses a qualitative descriptive method to help describe and explain the findings of the research data through observation, documentation, and interviews which will then be analyzed using content analysis, thematic analysis, and constant comparative analysis. This study reveals the influence of land conflicts on the legitimacy and sustainable development of companies. This study succeeded in revealing legitimacy repairing as a form of corporate legitimacy crisis, and found that the strategy adopted by companies based on legitimacy theory is a general strategy of "avoid overreaction/don't panic" and a pragmatic legitimacy strategy of "deny", "create monitors". This research is different from previous research because this research was conducted to look at it from an internal company perspective by using primary and secondary data to overcome the limitations of previous research that came from online disclosure media such as company websites and online news as well as conducting observations, documentation and direct interviews with companies.
INFLUENCE OF BIOSECURITY REQUIREMENTS ON THE STATE OF POULTRY FARMS
Authors: Danilova I. , Tsinoviy O. , Nalivaiko L. , Katerinich O. , Danilova Т.
Published: March 2023

This paper considers the main aspects that characterize the requirements of biological safety in poultry. First of all, the rules of keeping birds in cage batteries are indicated, the design features and rules of work on them are shown. Shows what to do and in what sequence, regarding cleaning in cell batteries using appropriate equipment and disinfectants. The peculiarities of keeping poultry on the litter and neutralization of a large amount of ammonia released with the help of appropriate chemicals are considered. A set of special measures is considered – disinfection, deworming, disinsection, deratization, which business entities should carry out for the prevention and treatment of poultry diseases, protection of people from infectious and invasive diseases common to humans and birds, as well as quarantine. The risks that are possible in case of non-compliance with biosafety requirements are shown, namely the risk of disease transmission and the ways in which it is possible, the first way – vertical (transmission of the pathogen through the egg), the second - horizontally (transmission – contact, aerogenic). The rules concerning workers of poultry farms, conditions under which their work on a poultry farm is possible are considered. The requirements of biological safety to the risks when visiting the farm by outsiders are also highlighted, namely what kind of inspection is required to enter the farm and what documents (questionnaires) need to be filled out, the need for appropriate instruction, and the importance. The paper also points out one of the main requirements for farm staff – hygienic procedures (hand washing, use of antiseptics), as well as the division of the farm into appropriate areas of production – sterile and non-sterile, which will avoid cross-contamination. It is also shown that barriers to footwear in industrial premises are an important factor. In summary, we can say that the above conditions are a guarantee of profitability of poultry.
Investigation of the effects of starvation stress in the midgut of the silkworm Bombyx mori
Authors: ERGİN ORDU Tuğçe , GÖNCÜ Ebru
Published: March 2023

During their evolution, organisms have developed various mechanisms to adapt to changing nutritional conditions such as mobilization of storage molecules and activation of autophagy. In this study, the mechanism of adaptive responses in the midgut of the silkworm Bombyx mori L., 1758 (Lepidoptera: Bombycidae) larvae, which were starved for different days, was investigated. The study was carried out at the Insect Physiology Research Laboratory and Silkworm Culture Laboratory at Ege University between 2018 and 2020. For this purpose, the histological structure of the midgut was examined using hematoxylin&eosin staining and its protein, sugar, glycogen, and lipid contents were determined. As autophagy markers, lysosomal enzyme activities were measured and expressions of autophagy-related genes (mTOR, ATG8, and ATG12) were analyzed by qRT-PCR. The results showed that, depending on the time of onset of starvation stress, autophagy plays no role as an adaptive response under starvation conditions or occurs at a much more moderate level than autophagy which happens as part of cell death during larval-pupal metamorphosis.
L’inactivation pharmacologique des cortex insulaire postérieur et somatosensoriel secondaire du primate atténue l’hyperalgésie thermique
Authors: Nagasaka K. , Takashima I. , Matsuda K. , Higo N.
Published: March 2023

Contexte: Nous avons précédemment développé un modèle de douleur centrale post-AVC (DCPA) chez le macaque et confirmé l’implication d’une activité accrue du cortex insulaire postérieur (CIP) et du cortex somatosensoriel secondaire (SII) dans l’allodynie mécanique, observée en cas de DCPA, en associant une inactivation pharmacologique de ces régions corticales et des techniques d’imagerie. Cependant, on ne sait pas si cette inactivation joue un rôle dans l’hyperalgésie thermique. Par conséquent, en utilisant ce modèle de macaque, nous avons examiné les réponses comportementales aux stimuli thermiques après une inactivation pharmacologique du CIP/SII.

Méthodes: Une DCPA a été créée chez deux macaques en induisant des lésions hémorragiques unilatérales dans le noyau ventral postérolatéral du thalamus, par injection de collagénase. Pour évaluer la perception de la douleur, la latence de retrait des mains à des stimuli thermiques de 37, 45, 50, 52 et 55 °C a été mesurée. Quelques semaines après l’induction de la lésion, une inactivation pharmacologique des CIP/SII par micro-injection de muscimol a été réalisée. L’effet de l’inactivation sur la latence de retrait a été évalué par comparaison avec la latence de retrait après injection de placebo.

Résultats: Quelques semaines après l’induction des lésions thalamiques, on observe une réduction des latences de retrait à la stimulation thermique (< 50 °C) de la main controlatérale de l’emplacement de la lésion chez les deux macaques, indiquant l’apparition d’une hyperalgésie thermique. Lorsque les CIP/SII sont inactivés par lemuscimol, les latences de retrait à des stimuli thermiques de 50 et 52 °C sont significativement augmentées par rapport à celles après injection de placebo.

Conclusion: Nos données soulignent qu’une activité accrue dans les CIP/SII après lésion thalamique peut contribuer à une douleur anormale en réponse à de multiples modalités et que la modulation de cette activité peut être une approche thérapeutique pour l’hyperalgésie thermique.

Signification: La DCPA est causée par des lésions cérébrales du système somatosensoriel et se caractérise par une allodynie mécanique ou une hyperalgésie thermique. Il a été démontré que l’inactivation pharmacologique de l’activité des CIP/SII a un effet analgésique sur l’allodynie mécanique ; cependant, l’efficacité de cette inactivation pour réduire l’hyperalgésie thermique n’était pas claire. Dans ce travail, en utilisant deux macaques, nous avons démontré que l’inactivation de ces régions corticales réduit l’hypersensibilité aux stimuli thermiques. Ce résultat souligne qu’une activité accrue des CIP/SII peut contribuer à une douleur anormale en réponse à de multiples modalités.
Modern challenges and threats to the digital transformation of companies
Authors:   State University of Telecommunications, Savchenko V. A.
Published: March 2023

The article examines challenges and threats to the digital transformation of companies, organizations and enterprises. The factors that determine the success of digitization processes are analyzed, the influence of the human factor on transformation is considered, the importance and necessity of a change in thinking for the success of digital transformation is determined. Here are five strategies companies can implement to overcome the challenges of digital transformation and realize their potential with new digital systems and technologies.
The role of antivirus protection in the formation of the ecosystem and immune system of corporate information systems
Authors:   State University of Telecommunications, Skybun O. Zh.
Published: March 2023

The article examines the need for the formation of an ecosystem, a corporate information system with a strong immune system, which, together with antivirus protection, provides a sufficient level of cyber protection of the entire system for the possibility of stable and stable functioning of large corporate information systems. The need to take into account the fact that modern corporate information systems are formed on the basis of neural systems, artificial intelligence and the Internet of Things was also noted. This determines the need for a complex approach to the selection of an antivirus software product, which must be harmoniously integrated into the general architecture of the information system to ensure a high level of antivirus protection. An analysis of available anti-virus software products has shown that the vast majority of them are effective for home use. For corporate information systems, it is necessary to choose an antivirus product based on the recommendation and technical support of the vendor company, which is responsible for the entire software product used in the system being built.
Virtual Cloud Environment Protection Method Based on Attack Graph Structure
Authors:   State University of Telecommunications, Vyshnivsʹkyy V. V.
Published: March 2023

The article proposes the creation of an effective system for detecting and responding to external influences in order to minimize the consequences of breaching the protection of cloud virtual resources in a timely manner. Mathematical models have been improved to ensure the protection of virtual cloud resources for software-configured networks, namely: a mathematical model of the impact of an attack on virtual cloud resources, a mathematical model for assessing the state of virtual cloud resources, a mathematical model for choosing a countermeasure based on a complex indicator for software-configured networks. Based on the obtained mathematical models, a graph of attacks on the virtual cloud environment was developed. This graph allows you to get information about all known system vulnerabilities.
Security problems and countermeasures against attacks in NFC
Authors:   State University of Telecommunications, Khvorostyanyy R. V.
Published: March 2023

Near Field Communication (NFC) technology is widely used due to its ease of use. However, NFC is vulnerable to security attacks such as man-in-the-middle; denial of service (DOS), etc. These attacks lead to the leakage of important user data, which can affect any organization that uses NFC applications and technologies. This article discusses NFC vulnerabilities and different types of NFC attacks. The article also discusses possible solutions that could protect NFC from these security threats.
Technical analysis of CaddyWiper malware
Authors:   State University of Telecommunications, Matsko O. Y.
Published: March 2023

The article examines a new type of malware designed to destroy information resources and media at network endpoints. Discovered in 2022, the CaddyWiper virus destroys user data, separates information from connected drives. The purpose of the work is to study the characteristic features of CaddyWiper to increase the effectiveness of malware detection.
Topical issues of IT risk management at critical information infrastructure facilities
Authors:   State University of Telecommunications, Hordiyenko S. B.
Published: March 2023

Today, the urgent issue of the security industry is to address the state of information security of critical infrastructure objects with the effective application of appropriate measures to maintain it in proper condition. This article emphasizes the particular relevance of these issues with an emphasis on the most significant aspects of ensuring information security at critical infrastructure facilities through risk management and strategies for responding to them. The essence of ways of responding to risks and their processing is revealed. Preliminary planning of the risk management process related to the information infrastructure is a key aspect of the security risk management process. A well-planned process involves matching the significance of the business process for the critical infrastructure object with the costs necessary to manage the risks affecting this business process. All business processes for which the value of the loss is greater than some predetermined value are declared critical. Risk management planning activities are most effectively carried out by a special working group consisting of the top manager, heads of other departments and the IT manager. The working group forms strategies for responding to identified, assessed and ranked risks. It should be emphasized that when analyzing risks, it is necessary to take into account not only the operation of systems in regular mode, but also the peak load on them. When making decisions about responding to relevant risks, costs must be taken into account, taking into account the full assessment of the level of risks characteristic of the operation of critical infrastructure objects. When managers of business units determine tasks to combat risks in their units, most often they accept any risks without understanding the consequences, since their real goals are related to the performance of the main official tasks that affect the final result of the activity. Risk treatment options should be evaluated based on the degree of risk reduction and the degree of any additional benefits or opportunities created. Special attention is paid to the risk-taking strategy, which requires significant professional and intellectual abilities of decision-makers. Taking into account the peculiarities of this method of response, it is necessary to develop an approach adapted for a specific object of information activity with the determination of the question of the economic feasibility of applying security measures in relation to the manifestation of possible information security incidents.
Prospects of using UAV-repeaters in integrated TN and NTN-networks
Authors:   State University of Telecommunications, Yakovets V. P.
Published: March 2023

The combination of terrestrial (TN - Terrestrial Network) and non-terrestrial (NTN - Non-Terrestrial Network) networks is a promising direction for the development of communication access systems and service provision. The paper presents the prospects of integrating TN-NTN networks using unmanned aerial vehicles (UAVs), which perform the functions of repeaters and satellites located in low Earth orbit (LEO - Low Earth Orbit), and which provide communication at a frequency of 6 GHz. The use of UAVs as telecommunication relays is becoming a more widespread concept today due to low cost and high mobility, which allows providing a wide range of services to a large number of users at almost any point of the allocated territory. A multi-level access system using a dense satellite LEO group allows you to offload a large part of the traffic coming to the UAV from ground users (GUE - Ground Users). The transfer of UAV traffic to the NTN segment significantly reduces the probability of UAV downlink communication failures from 70% to almost zero, and also increases the quality of the uplink under conditions of optimal elevation of LEO satellites. Due to the offloading of traffic in NTN, the probability of failures in the uplink communication channel is reduced by about 12%. Despite the limited bandwidth available below 6 GHz, UAVs with NTN offload meet C&C data rate requirements of 60-100 kbps per UAV per TN cell. Less loading of the UAV leads to proportionally higher indicators, which under such conditions allows for the provision of broadband services. Effective offloading of UAV traffic to the NTN segment allows maintaining an acceptable level of the signal to interference + noise ratio (SINR – Signal to Interference + Noise Ratio).
Optimization of the mathematical model of the logistics flows of the trade network
Authors:   State University of Telecommunications, Mykolenko R. О.
Published: March 2023

The article shows the relevance of the wide application of mathematical models in various spheres of business, namely in the management of the company's activities. Mathematical modeling is used in economic research. Modeling logistics strategies reflects qualitatively new approaches in enterprise management. Attention is focused on the fact that the economic activity of the enterprise depends on the efficiency of the management of its resource flows. This is a direct factor affecting the efficiency of the enterprise in all its spheres. The scientific approach allows you to transfer the modeling of a commercial enterprise to the mathematical plane. The article presents knowledge about logistics flows, establishes the essence of the main concepts and meanings. From the point of view of the theory of logistics, the category "flow" and the main types of logistics flows, the generalization of the distinctive features of logistics flows, as well as the establishment of the dependence between the performance of logistics functions and the transformation of material flows will be considered. A mathematical model was built and methods of optimization of logistics flows of the trade network were chosen. A solution to the problem of cost minimization was found using a method that is optimal from the point of view of the criteria for meeting the needs of the customer (in this case, the customer is a large retail chain of stores).
Use of sockets technology in the network system of a virtual laboratory based on machine learning algorithms
Authors:   State University of Telecommunications, Hanenko L. D.
Published: March 2023

The use of virtual laboratory systems has become a modern trend in many areas of human activity. Modern networked virtual laboratories use virtual reality technology to implement laboratory simulations and interactive environment technology to control simulations. The work examines the advantages, principles of building a virtual laboratory and existing problems in the communication mechanism. In particular, when exchanging data between node machines in a network virtual laboratory system, the network layer cannot ensure the same transmission of packet data. The article reviews modern methods of machine learning: supervised, unsupervised, semi-supervised and reinforcement learning. It was determined that the main characteristics of the virtual laboratory system architecture are openness, modularity and real-time communication. The communication mechanism of the virtual laboratory system does not meet the requirements of high bandwidth and real-time two-way communication. To solve the problem of technical requirements of high throughput and ultra-low delay of the virtual laboratory system, a communication planning technology based on a deep machine learning algorithm is proposed. The work uses the Socket mechanism to implement communication based on the TCP/IP protocol. In accordance with the technical requirements of high throughput and ultra-low latency of the network system of the virtual experiment, a technology of self-tuning and optimal planning of the communication network based on the deep machine learning algorithm is proposed. The proposed technology makes it possible to make the optimal decision regarding resource planning and implement optimization of the indirect selection of system parameters.
Information technology for choosing routes using machine learning methods
Authors:   State University of Telecommunications, Trehubchak I. M.
Published: March 2023

Information technologies penetrate into all spheres of human life and the activity of companies. The sphere of tourism did not escape their influence. Tourism is a leisure activity that involves complex decision-making processes, which is why the development of recommendation systems that will help facilitate these processes is relevant. It is for this purpose that the method of selecting tourist routes using machine learning methods was created in the work. In the course of the research, the field of tourism was analyzed, the peculiarities of recommendation systems were established. The levels of the proposed methodology are described, indicating the features of the backend and frontend. A characteristic feature of the proposed methodology is the use of machine learning classifiers, such as decision trees, support vector method, and multilayer perceptron, in the model of optimal selection. It is this combination of methods that will allow you to choose the best route from the proposed ones. They are used to distinguish specific destinations within each data set. To make the complex model usable and interpret its results for the tourist, the decision tree models are transformed into decision rules, and then the information is passed to the user interface control module. In order to obtain a high-quality forecast, the methods of machine learning were considered in detail, and their features were determined. It has been found that the classification performance can be improved by using a combination of classifiers and methods such as decision trees, support vector method and multilayer perceptron. This combination of algorithms will allow to predict the optimal tourist route. Both technical and practical aspects, including data sparsity, scalability, transparency, system accuracy, usability, and user acceptability, were considered to evaluate the effectiveness of the proposed methodology.
Choosing the optimal approach to building a recommender system based on movie data
Authors:   State University of Telecommunications, Berezivskyy M. Yu.
Published: March 2023

Recommender systems have become increasingly popular recently because they can address the problem of information overload by suggesting items of interest to the users. The volume of information with each year increases and more opportunities for Internet business, so it becomes easier to get anything through the internet, such as goods, books, movies, news. Work in the field of creating recommendation systems can be both commercial and research in nature, and need to address a number of issues. The paper studies the problem of choosing the optimal approach to building a recommendation system by repulsive from the available data. It is not possible to create a recommendation system without data. The data is usually available in an explicit or implicit way. Data that is called explicit can be collected by finding reviews and sharing of user views about different products. However, the implicit data is related to the search magazine and the data history available on the system. Choosing an optimal approach to building a recommendation system will allow the machine learning algorithm to be used. Simulated recommendation system architecture that helps to understand how to build a user-defined recommendation process. Recommender systems are classified in the manner of sampling the necessary material for the user system. Two basic approaches are primarily applied: collaborative filtering and content-oriented filtering. There is also a hybrid filtering that combines both collaborative and content-oriented filtering. The work carried out analysis and comparison of recommendation systems by types. Comparing types of recommendation system based on basic characteristics: implementation complexity, implementation accuracy, job speed, dependency on system users. Analysis of the core content-oriented filtering machine learning algorithms have been conducted.
Development of a modern global information infrastructure based on a personal satellite communication system
Authors:   State University of Telecommunications, Hordiyenko S. B.
Published: March 2023

The information industry is the main branch of the modern economy. The processes of informatization lead to qualitative changes in society itself in the direction of acquiring sustainable features of the modern information society, the technological basis of which is the global information infrastructure (GII). GII provides free access to information resources to every inhabitant of the planet and provides a set of communication services that provide an open set of applications, covers all types of information and provides the opportunity to receive it anywhere, anytime, at an affordable price and at an affordable price quality. The creation and operation of modern satellite communication systems contributes to the creation of a global information infrastructure. Satellite communications, which is a promising component of modern cyberspace infrastructure, is qualitatively changing the entire telecommunications industry and affecting the usual way of life. Personal satellite communication systems have significant advantages over mobile communication systems. Today, the use of new spacecraft with improved characteristics is expected, which will represent almost the entire range of satellite services. According to documents submitted to the US Federal Communications Commission, satellites in space will «communicate» with each other at a frequency of more than 10 thousand GHz using a laser beam. Ground stations and user terminals will be communicated on 12 GHz radio bands. The promised data rate is 1 Gbps for each consumer. Regarding potential Starlink applications, SpaceX’s management points to the risky nature of the low-bandwidth broadband satellite business and adds that SpaceX plans to use its Starlink satellites not only to provide broadband Internet connectivity in remote areas of the world, but also to connect on other planets.
Method of supporting decision­making in the development of the subject field of multi­agent processes for the conversion of information system resources
Authors:   State University of Telecommunications, Kolumbet V. P.
Published: March 2023

Multi-agent systems represent a new direction in the development of artificial intelligence, which was formed on the basis of research results in the field of distributed computer systems, network technologies for solving problems, and parallel computing. The agent approach is already used in the distributed solution of complex tasks, enterprise reengineering, e-business, logistics, and uniform modeling. In this problem, two classes of problems can be classified: tasks of distributed management and tasks of planning the achievement of goals, in which agents jointly solve the set problems, and it is necessary to ensure an effective way of cooperation of their activities, and local tasks in which agents use common, as a rule, limited resources. The implementation of software agents in the information system will, to some extent, simplify the work of users, as the agents will be able to monitor the state of the system and offer certain solutions. An important problem in the development of the information system is obtaining the knowledge of specialists in a certain subject area. For the most part, this knowledge is not formalized and therefore inaccessible to other people. A successful solution to this problem is the addition of a general knowledge base to the created conceptual model and the development of agents that, based on this knowledge, will offer solutions to certain problems in an automated area that performs certain formalized user functions and provides support in solving organizational and technical management tasks. The article considers a method of decision-making support in the development of the subject area of multi-agent processes of transformation of information system resources, which differs from existing methods by using the information component of the description of the subject area based on the analysis of information flows to build a conceptual model of the information system, which allows you to significantly speed up and simplify the development of software complexes.
Asymptotic characteristics of multichannel access systems with orthogonal filteration
Authors:   State University of Telecommunications, Кlobukova L. P.
Published: March 2023

The proposed article deals with digital modulation schemes that use a certain number of equidistant orthogonal subcarriers (the socalled OFDM technology). The theory of radio engineering chains and signals is used as the scientific and technical basis of the problem. The spectra of discrete signals were analysed, the influence of violations of the conditions of Kotelnikov's theorem and the asymptotics of the recovery errors of the original continuous signals were investigated. Methods of forming composite signals with arbitrary frequency difference of subcarriers have been developed. It is shown that when the amount of frequency shift of the basic series decomposition functions and the width of the spectrum of the main and side lobes in the spectrum of the output signal are matched, it is possible to count on the minimal influence of mutual interference and intersymbol interference of the composite signal. It was established that the method of orthogonal frequency multiplexing of channels (OFDM) allows to significantly increasing the bandwidth of the wireless communication system. In addition, with dynamic load changes in wireless networks, the impact of frequency collisions and an increase in the level of intra-system interference is minimized. Graphical analysis of the results of the series expansion on the quasiorthogonal system of basis functions shows that the errors of restoration of the original signals can reach unacceptable values. It was also established that when expanding into a non-orthogonal series with a larger number of members, the situation with the restoration of the original signals becomes a little more suitable, but no guarantees of monotonous improvement of the situation with restoration errors can be given in principle. This problem requires additional analytical research.