bluuebunny/crossref_metadata_2025 huggingface dataset:
A comparative analysis of sustainable exploitation of renewable resources for different information structures
Authors: Угольницкий Геннадий Анатольевич , Ougolnitsky Gennady , Усов Анатолий Борисович , Usov Anatoly
Published: January 2023

In this paper, a brief description of the authors' concept of sustainable management is given. According to the proposed concept, the sustainable development of an active system means that in the same time some requirements of viability of the system are satisfied, and the interests of the active agents are considered and coordinated. The main emphasis is made on two mathematical examples. First, a relation between egoistic and altruistic evolutionary strategies is studied by means of the Verhulst-Pearl model. Second, selfish and cooperative behavior of the users of a renewable resource is compared on the base of a differential game model. The conditions of viability are formalized as phase constraints. Their satisfaction may be a result of the voluntary coordination of the agents or their enforced coordination provided by a specially introduced principal. The main contribution of the paper consists in the comparative analysis of these ways of sustainable management.
Optimum positioning of network platforms on a plane
Authors: Коновальчикова Елена Николаевна , Konovalchikova Elena
Published: January 2023

The paper presents a study of equilibrium in a two-sided market for network platforms with cross externalities between buyers and sellers. The proposed model is a generalization of Armstrong's (2006) monopoly model for the case of a duopoly in a two-sided market for network platforms located on a plane. The paper solves the problem of optimal pricing and investigates the question of the optimal location of platforms in the market, provided that the heterogeneous utility of agents of both groups (buyers and sellers) is formed taking into account the Hotelling specification with the Manhattan metric.
Intransitively winning chess players' positions
Authors: Поддьяков Александр Николаевич , Poddiakov Alexander
Published: January 2023

Chess players' positions in intransitive (rock-paper-scissors) relations are considered. Namely, position $A$ of White is preferable (it should be chosen if choice is possible) to position $B$ of Black, position $B$ of Black is preferable to position $C$ of White, position $C$ of White is preferable to position $D$ of Black, but position $D$ of Black is preferable to position $A$ of White. Intransitivity of winningness of chess players' positions is considered to be a consequence of complexity of the chess environment - in contrast with simpler games with transitive positions only. Perfect values of chess players' positions are impossible. Euclidian metric cannot be used to describe chess players' positions in space of winningness relations. The Zermelo-von Neumann theorem is complemented by statements about possibility vs. impossibility of building pure winning strategies based on the assumption of transitivity of players' positions. Questions about the possibility of intransitive players' positions in other positional games are raised.
A new method for determining muckpile fragmentation formed by blasting
Authors: Tosun A.
Published: January 2023

Muckpile fragmentation formed by blasting depends on the specific charge factor, the discontinuities in the rock mass, and the rock strength. Determination of the discontinuity characteristics and rock strength is a long and difficult process. These two parameters are directly associated with the rock drilling speed. Therefore, it is the drilling speed of the machine used for the blast-hole, rather than the blasthole discontinuity characteristics and rock strength parameters, that is used in the prediction of muckpile fragmentation before blasting. Primarily, it has been suggested that the muckpile fragmentation values can be correctly determined by establishing correlations between the efficiency of the loader and muck pile fragmentation, since fragmentation is directly correlated with the former parameter. Subsequently, a correlation predicting the drilling speed of the drill machine was developed according to the discontinuity characteristics of the blasting surface and the rock strength. Finally, a correlation was developed predicting muckpile fragmentation according to the specific charge factor and the drilling speed of the drill machine The data was obtained by conducting blasting tests in two different limestone quarries.
Applicability of the risk ranking methodology designed for water reservoirs to tailings storage facilities
Authors: Nisic D. , Knezevic D. , Cyjetic A. , Nisic N. , Jovanovic V.
Published: January 2023

The risks associated with operating water reservoirs and tailings storage facilities (TSFs) are different because of their different purposes, methods of construction and operation, and characteristics of the materials impounded and their flow behaviour. Regardless of the differences, these two types of structures are often put in the same category when it comes to risk assessment and the application of relevant methodologies, which may result in unrealistic outcomes. In this paper we investigate whether it is possible to apply the risk ranking methodology designed for water reservoirs to TDFs and overview the key differences between these two types of structures. We also provide a comparative analysis of the results obtained by conducting a risk assessment of the operation of a TSF, applying the method recommended by the International Commission on Large Dams (ICOLD), and analyse the results using the failure mode and effects analysis (FMEA) technique. It is concluded that a more realistic evaluation of risk levels can be obtained by adopting a systematic approach to risk assessment in accordance with the traditional risk definition on which the FMEA technique is based.
Beyond Modernity: The Moral Economy of Ibn Khaldun
Authors: Tayob Abdulkader
Published: January 2023

The idea of a moral economy has gained salience in the 21st century. It has been used by economists, political scientists, and to a lesser extent, scholars of religion, for alternative values of money, exchange, debt, poverty, and prosperity. As an actual moral economy seems elusive in the presence of a dominant capitalist market, this essay reflects on the work of Abd al-Rahman Ibn Khaldun, the 14th-century historian and philosopher. Ibn Khaldun's reflections on the different ways in which individuals seek a livelihood (ma'ash) reveal systematic and also ethical considerations. The essay examines some key terms which he uses to understand human sustenance and ethical reflections on various crafts. His 'moral economy' combines economic considerations with divine beneficence, rational thought, and ethical purpose.
Tension in Religious Practices of Muslim Students when Studying Emergency Medical Care
Authors: Esack Farid , Boomgaard Raeesah , Vincent-Lambert Craig
Published: January 2023

The Bachelor of Health Science degree in Emergency Medical Care (BHS EMC) in South Africa requires that students participate in clinical learning and medical rescue practicals. This study explores the views and experiences of a sample of Muslim students studying EMC at one university regarding potential areas of conflict between their religious obligations and the required academic activities. Second, in presenting the outcomes of these interviews, the article also reflects on the challenges facing secular universities when confronted with heterogeneity in understanding the religious requirements or obligations of the faithful - articulated or unarticulated - in the same religious community on the one hand, and the dilemma of maximum religious accommodation and embrace of religious pluralism versus pragmatism and the limitations of programmatic and budgetary constraints, on the other. Third, in discussing the challenges presented by the students, and their understanding of Islam and its requirements, we use the ideas of Shahab Ahmed (d. 2015) as articulated in his magnum opus, What is Islam? (Ahmed 2016). He argues that the term 'Islam' 'expresses a historical and human phenomenon in its plenitude and complexity of meaning' (Ahmed 2016:5). Finally, in locating the responses of our informants within their religio-theological and legal contexts, as well as in the broader world of Islam in social and cultural contexts, we draw attention to the nuanced realities of both textual and lived Islam.
Evaluation of Outcomes and Treatment Options Among Trauma Patients with Abdominal Vascular Injuries
Authors: Kurt David , Ammar Chad , Ablah Elizabeth , Lightwine Kelly , Okut Hayrettin , Lu Liuqiang , Haan James M
Published: January 2023

Introduction.  Abdominal vascular injuries are rare and are associated with significant morbidity and mortality. Treatment options include nonoperative management, open repair, and endovascular procedures. This study aimed to characterize patients and detail treatment modalities among those who sustained a traumatic abdominal vascular injury.
Methods.  A 6-year descriptive retrospective study was conducted at an American College of Surgeons-verified level 1 trauma center and included all adult patients who sustained an abdominal vascular injury.
Results.  Most vascular injuries were to the iliac artery (27.9%), abdominal aorta (25.6%), and inferior vena cava (25.6%). Twenty-seven percent of patients sustained an injury to more than one vascular structure. Thirty-four percent of patients died before treatment of the abdominal vascular injury. Among the 28 patients (65.1%) treated for their vascular injuries, 46.4% were treated with open surgery, 32.1% were treated nonoperatively and 21.4% with coil embolization. The most common vascular injuries treated were lacerations (56%) and transections (21%). Sixty-four percent of the patients who survived to discharge presented for follow-up care with a mean follow-up period of 3 ± 4.1 months. There were no vascular reinterventions after discharge for patients who followed up with our hospital. 
Conclusions.  Study findings suggests that appropriately selected cases of traumatic vascular injuries may be safely managed nonoperatively, as there were no mortalities, complications, or reinterventions among these patients.
Intelligent Job and Career Recommender Systems: A Systematic Review v1
Authors: Lange Maximin
Published: January 2023

We are supplying the first systematic review on intelligent job recommender systems (IJRS). In this work, we analyse prominent issues and problems regarding IJRSand remedial techniques available in theliterature. We furthermore categorise ML and data mining approaches employed in IJRS, extracting core features of an ideal IJRS. We furthermore review performance of employed algorithms regarding experimental design, used datasets and variables measured. At last, we focus on future directions presented in the studies in this review.We are focusing on the following research questions:Regarding IJRSsystems, Which types of engines or algorithm are available? Where is their data input coming from? How was the algorithm assessed by the authors? Which qualities does an ideal IJRS possess? What are promising directions for future work?
[RETRACTED] Single-moclecule Immunofluorescence Tissue Staining Protocol for Oligomer Imaging v1
Authors: Andrews Rebecca
Published: January 2023

[RETRACTED]

This protocol details about immunofluorescence staining for oligomer imaging.
PROCEDIIENTO PARA LA SOLICITUD DE ADMISIÓN A UN PROGRAMA DE DOCTORADO DE LA EIUCAM (PREINSCRIPCIÓN) v1
Authors: not provided cgarcia
Published: January 2023

La solicitud de admisión será on-line y permanecerá abierta durante todo el curso académico. Preinscripción on-line Podrán preinscribirse quienes cumplan los requisitos de acceso a los programas de doctorado y también los estudiantes que no hayan acabado los estudios que dan acceso al Doctorado. En este caso su admisión está condicionada a obtener la titulación antes de formalizar la matrícula. NOTA: Es conveniente consultar en la web del programa de doctorado elegido, por si existiera algún criterio específico de admisión antes de proceder a la preinscripción.
Search for the optimal section area annular section ecentrally compressed elements of reinforcement
Authors: Mordovsky Sergey S. , Frantseva Daria O.
Published: January 2023

This article deals with the search for the optimal cross-sectional area of reinforcement of eccentrically compressed reinforced concrete elements of an annular section using the Mathcad software package. The determination of the optimal cross-sectional area of the reinforcement is carried out using the implementation of algorithms for finding the minimum that meets the requirements of the strength and stability of reinforced concrete elements. An analysis of the obtained data is given by comparison with the problem solved in the Handbook to SP 63.13330. The developed programs make it possible to save the designers time when choosing the reinforcement section and checking the strength and stability of reinforced concrete elements.
Quantitative characteristics of surface runoff from railway tracks
Authors: Teplykh Svetlana Y.
Published: January 2023

Analysis is carried out and the nature of surface runoff filtration in the ballast prism of the railway track is considered, as well as options for water migration in the upper and lower structure of the ballast prism are considered. The formula of flow rate of rain, melt and filtration runoff is obtained. The formula for surface runoff consumption from the railway track was clarified, and the total surface runoff flow rates for the areas of railway transport facilities were determined. It was found that when surface water seeps through the upper and lower structures of the path. Two lateral ejections occur. The proposed methodology for determining the flow rates of surface runoff from railway tracks allows using an adapted methodology proposed not for residential zones, which is relevant for 90% of the railway bed located in the Russian Federation, in particular, the Kuibyshev railway road located in the forest-steppe and semi-steppe zones.
Architecture of the workers' settlement of the Kuibyshev metallurgical plant in the 1950s
Authors: Samogorov Vitaly A.
Published: January 2023

The history of construction and features of the architectural and planning organization of the workers' settlement Metallurg, which was formed near the industrial district of Bezymyanka on the basis of the largest metallurgical plant in the 1950s, are considered. Its architecture reflected the features of Stalinist architecture and corresponded to the prevailing guidelines of that time for the development of the classical heritage. As a result, another version of the socialist city was implemented, based on attaching workers to production. The planning organization of the working settlement was based on the identification of the main highway with social and consumer services, the quarterly principle of residential development with courtyard spaces, and a single style of buildings.
Manufacturing flexible vascular models for cardiovascular surgery planning and endovascular procedure simulations: An approach to segmentation and post-processing with open-source software and end-user 3D printers
Authors: Kaufmann Reinhard , Deutschmann Michael , Meissnitze Matthias , Scharinger Bernhard , Hergan Klaus , Vötsch Andreas , Dinges Christian , Hecht Stefan
Published: January 2023

Three-dimensional (3D)-printed vascular models for cardiovascular surgery planning and endovascular procedure simulations often lack realistic biological tissues mimicking material properties, including flexibility or transparency, or both. Transparent silicone or silicone-like vascular models were not available for end-user 3D printers and had to be fabricated using complex and cost-intensive workarounds. This limitation has now been overcome by novel liquid resins with biological tissue properties. These new materials enable simple and low-cost fabrication of transparent and flexible vascular models using end-user stereolithography 3D printers and are promising technological advances toward more realistic patient-specific, radiation-free procedure simulations and planning in cardiovascular surgery and interventional radiology. This paper presents our patient-specific manufacturing process of fabricating transparent and flexible vascular models using freely available open-source software for segmentation and 3D post-processing, aiming to facilitate the integration of 3D printing into clinical care.
Engineered extracellular vesicle-mediated delivery of miR-199a-3p increases the viability of 3D-printed cardiac patches
Authors: Bar Assaf , Kryukov Olga , Etzion Sharon , Cohen Smadar
Published: January 2023

In recent years, extrusion-based three-dimensional (3D) bioprinting is employed for engineering cardiac patches (CP) due to its ability to assemble complex structures from hydrogel-based bioinks. However, the cell viability in such CPs is low due to shear forces applied on the cells in the bioink, inducing cellular apoptosis. Herein, we investigated whether the incorporation of extracellular vesicles (EVs) in the bioink, engineered to continually deliver the cell survival factor miR-199a-3p would increase the viability within the CP. EVs from THP-1-derived activated macrophages (MΦ) were isolated and characterized by nanoparticle tracking analysis (NTA), cryogenic electron microscopy (cryo-TEM), and Western blot analysis. MiR-199a-3p mimic was loaded into EVs by electroporation after optimization of applied voltage and pulses. Functionality of the engineered EVs was assessed in neonatal rat cardiomyocyte (NRCM) monolayers using immunostaining for the proliferation markers ki67 and Aurora B kinase. To examine the effect of engineered EVs on 3D-bioprinted CP viability, the EVs were added to the bioink, consisting of alginate-RGD, gelatin, and NRCM. Metabolic activity and expression levels of activated-caspase 3 for apoptosis of the 3D-bioprinted CP were evaluated after 5 days. Electroporation (850 V with 5 pulses) was found to be optimal for miR loading; miR-199a-3p levels in EVs increased fivefold compared to simple incubation, with a loading efficiency of 21.0%. EV size and integrity were maintained under these conditions. Cellular uptake of engineered EVs by NRCM was validated, as 58% of cTnT+ cells internalized EVs after 24 h. The engineered EVs induced CM proliferation, increasing the ratio of cell-cycle re-entry of cTnT+ cells by 30% (Ki67) and midbodies+ cell ratio by twofold (Aurora B) compared with the controls. The inclusion of engineered EVs in bioink yielded CP with threefold greater cell viability compared to bioink with no EVs. The prolonged effect of EVs was evident as the CP exhibited elevated metabolic activities after 5 days, with less apoptotic cells compared to CP with no EVs. The addition of miR-199a-3p–loaded EVs to the bioink improved the viability of 3D-printed CP and is expected to contribute to their integration in vivo.
Laser bioprinting of human iPSC-derived neural stem cells and neurons: Effect on cell survival, multipotency, differentiation, and neuronal activity
Authors: Koch Lothar , Deiwick Andrea , Soriano Jordi , Chichkov Boris
Published: January 2023

Generation of human neuronal networks by three-dimensional (3D) bioprinting is promising for drug testing and hopefully will allow for the understanding of cellular mechanisms in brain tissue. The application of neural cells derived from human induced-pluripotent stem cells (hiPSCs) is an obvious choice, since hiPSCs provide access to cells unlimited in number and cell types that could be generated by differentiation. The questions in this regard include which neuronal differentiation stage is optimal for printing of such networks, and to what extent the addition of other cell types, especially astrocytes, supports network formation. These aspects are the focus of the present study, in which we applied a laser-based bioprinting technique and compared hiPSC-derived neural stem cells (NSCs) with neuronal differentiated NSCs, with and without the inclusion of co-printed astrocytes. In this study, we investigated in detail the effects of cell types, printed droplet size, and duration of differentiation before and after printing on viability, as well as proliferation, stemness, differentiation potential, formation of dendritic extensions and synapses, and functionality of the generated neuronal networks. We found a significant dependence of cell viability after dissociation on differentiation stage, but no impact of the printing process. Moreover, we observed a dependence of the abundance of neuronal dendrites on droplet size, a marked difference between printed cells and normal cell culture in terms of further differentiation of the cells, especially differentiation into astrocytes, as well as neuronal network formation and activity. Notably, there was a clear effect of admixed astrocytes on NSCs but not on neurons.
Deciphering optimal management options for headache
Authors: Bangale Nikhil , Erande Suhas , Sundar K Shyam , Mohiuddin Ahmed
Published: January 2023

Headache is one of the most common, painful, and disabling conditions that affects people of all ages worldwide and can have a substantial impact on quality of life of those affected. Stress is one of their main aggravating factor for headache across geographies, more so in millennials and females. Headache disorders are most troublesome in the productive years of life with lost working days and reduced productivity. Majority of those with headache have primary headache disorder especially migraine, tension-type headache and medication-overuse headache. Without proper treatment, headaches can be severe and interfere with day-to-day activities and can also become chronic or recurring affecting the well-being of an individual and predispose them to other illnesses. Self-care with simple analgesics in managing primary headache disorders can help reduce frequency of attack and severity with positive effect on physical symptoms and functional capacity. Paracetamol (acetaminophen) is a safe analgesic with good gastrointestinal tolerance and is recommended as 1 line treatment option to reduce pain in various conditions including primary headache disorders. Caffeine, a common additive to analgesic drugs is known to increase the analgesic potency. The anti-nociception enhancing effect of caffeine when given with acetaminophen significantly improves efficacy over use of only paracetamol.
A case of acrocallosal syndrome in a neonate with congenital heart abnormality
Authors: Gilani Abolfazl , Sarmadian Roham , Karimi Hanieh , Biglari Habibe Nejad , Vasigh Mahtab
Published: January 2023

The usual features of the acrocallosal syndrome (ACLS) are agenesis of the corpus callosum, mental retardation, prominent craniofacial deformities, and specific digital abnormalities. ACLS is a rare genetic disorder which may be autosomal recessive, however it usually occurs sporadically.

A 20-day-old newborn was admitted to the pediatric clinic due to the discovery of corpus callosum agenesis during pregnancy. The fetal echocardiography revealed an ASD and moderate tricuspid regurgitation (TR). During limb assessment, right foot pre-axial polydactyly was noted, and skull exam revealed anterior fontanelle enlargement. The brain MRI showed agenesis of the corpus callosum and enlarged lateral ventricles. The parents had no consanguinity and their genetic test had shown no anomalies.The neurologist decided to monitor the neurological development of the child.

The current case provides additional evidence that ACLS can be associated with pre-axial polydactyly and craniofacial symptoms including enlargement of the anterior fontanelle. Second-trimester ultrasonography can detect central nervous system malformations such as ventricular enlargement and corpus callosum anomalies. Moreover, Echocardiography is recommended to check for heart abnormalities in these children.
A New Mathematical Model for the Integration of Production and Distribution in Mobile Centers
Authors: Mansyur Abil , Subrahmanyam Satya , Ponkratov Vadim , Zonyfar Candra , Akhmadeev Ravil , Manoharan Kavitha
Published: January 2023

In today's competitive environment, having the best sequence of operations for production and distribution activities is a basic need for survival. As a result, one of the major challenges in fixed supply chain systems is unnecessary transportation costs and the inability to meet customer demand as quickly as possible. In order to meet these challenges, factories and mobile equipment have been considered in this study, and have recently been used in several industries, including pharmaceutical, chemical, and dairy. In the course of this study, a novel mathematical model was put forward for an integrated production and distribution scheduling problem taking into account some real-world features, focusing on reducing customer waiting time and also reducing production costs. A small-scale problem was resolved to check the model’s accuracy. The accuracy of the model is affirmed given the example and its solution acquired from GAMS software. The results of the study prove the effectiveness of this model in reducing customer waiting time and production costs and also demonstrate that the model has the capacity to be utilized by all organizations that produce and distribute perishable products, including dairy and pharmaceutical products, chemical compounds and masks during the Coronavirus pandemic.
MHD Nanoliquid Flow Along a Stretched Surface with Thermal Radiation and Chemical Reaction Effects
Authors: N. Nithya , B. Vennila
Published: January 2023

The consequences of viscous, ohmic, thermal radiation, and chemical reaction on an incompressible, steady, magnetized nanofluid moving through a stretched surface are investigated for choosing two distinct Nanoliquids (Cuo/water and Silver/water). Through the similarity transformations, the controlling dimensional equations of momentum, energy, and concentration were simplified to non-dimensional forms. The solution to the resulting problem is obtained by Bvp4c. The velocity, temperature and concentration are significantly shown for various emerging factors. On both kinds of nanofluids, thermal is grown consistently with an increasing Eckart number. It does, however, lessen as the radiation term values increase. Moreover, if the Schmidt number ranges on the concentration fluid flow indicate that the H(η) profile is going to fall. The tendency for H(η) to boost as the Soret number raises is becoming increasingly noticeable. Ag/water has a higher heat flow rate than Cuo/water when the amounts of Eckart and Radiation numbers are changed. Tables and plots displayed an engineering physical parameter such as coefficient of skin friction, rate of heat transmission and mass transfer.
Implementation of Data Analytics for the Accuracy of Service Time Prediction Models
Authors: Ritzkal Ritzkal , Rachmawati Fitria , Widhyaestoeti Dahlia , Fatimah Fety
Published: January 2023

The performance of repair services is very important to determine the achievement of consumer confidence. The strategy that needs to be made is to pay attention to the timeliness of repairs so that no one is harmed between consumers and service providers. Tracing information on data from repair services is one effective way to determine the accuracy of computer repair time. The collection of information used comes from the Istidata Indopacific Solution Center (IISC) repair service dataset, consisting of a collection of data on the completion time of product unit repairs that are achieved and not achieved. Repair completion time is the time in accordance with the agreement between the repair service party and the consumer. Data processing is carried out by processing analytical data by utilizing the Weka Tools software with the application of classification with the J48 decision tree method which is the development of the C4.5 algorithm. The effectiveness of this method was tested using 10-fold cross validation, where from the results of the confusion matrix measurement an accuracy of 99.5% was obtained. The result states that the J48 decision tree method is effective and can be used to predict the accuracy of computer repair time.
Analysis of Influence of Cruise Speed and Flight Level Change on Fuel Consumption in Air Traffic Flow Management
Authors: Mukhina Maryna , Ilnytska Svitlana
Published: January 2023

The problem of flight planning in case of delay demands is considered. The criterion restrictions between fuel consumption and the required flight time when the nominal cruise speed changes are investigated. It is proved that flight delay in the air can be realized without additional fuel costs, which is determined and estimated in the absence or presence of wind. The impact of choosing a different flight level and using additional fuel to obtain a longer delay was also considered and analyzed. The results show that for different flight levels and wind direction the delay may be varied from 3 minutes to 13 minutes. The initial flight level is defined as one of the main parameters that affect the amount of delay in the air.
Analysis of Technical Solutions for Identification of Internet Things in Modern Communication Networks
Authors: Vyshnivskyi Viktor , Sribna Iryna , Zinchenko Olha
Published: January 2023

The article examines the current state of development of the Internet of Things and the principles of their identification; analysis of technical solutions for identification of the Internet of Things in modern communication networks; the parameters of quality of service and identification of devices and applications of the Internet of Things are investigated, and also the perspective method of construction of network architecture IoT with intermediate level of interaction which differs from known that allows to reduce network delay at exchange of service messages between local and global registers of system is investigated. Based on the obtained delay values, we can conclude that in order to minimize the delay, it is necessary to optimize the routes for accessing GHR servers. Considering the differences between the main components of the identification system, it is worth noting the combination of Global Handle Register and Local Handle Register in one object for testing. In the long run, this makes it possible to evaluate the multiple characteristics of the system at the application level. The resulting system in stationary execution also allows you to clearly demonstrate the speed of the identification rate, the route of service traffic and other parameters.
Research of Precision of Non-collinear Inertial Measurement Devices
Authors: Sushchenko Olha , Bezkorovainyi Yurii , Golitsyn Volodymir
Published: January 2023

The non-collinear measurement devices based on the inertial triaxial devices, and structural units such as the triangular, and quadrangular polyhedrons are presented. The corresponding matrices of guide cosines are obtained. In contrast to the known non-collinear measurement devices, the measurements of all sensors that are part of the triaxial devices are taken into account. A description of the relative position of the measurement axes of the individual sensors in the proposed measurement devices is given. Theoretical estimation of non-collinear measurement devices of MEMS-sensors on the basis of uniaxial and triaxial angular velocity meters using correlation matrices of measurement errors is obtained. The obtained results are useful because they are aimed at providing high-precision and reliable measurements that is important for unmanned aerial vehicles, which are currently widely used in Ukraine.
Data Transmission in SAGIN with FANET/MANET of Drones
Authors: Kharchenko Volodymyr , Grekhov Andrii , Kondratiuk Vasyl
Published: January 2023

The purpose of this article is to simulate data transmission and calculate traffic parameters in SAGIN air segment for which Ad Hoc network of flying drones is considered as a model. Traffic modeling is based on the manet-routing-compare example from the ns3 simulator library, which has been supplemented with code to calculate packet loss, throughput, and message transmission delays. The program allowed considering drones movement at both low and high speeds from 3.6 km/h to 72 km/h. The dependences of traffic losses on data transmission power, transaction sizes and data transmission speed are obtained and analyzed. The distribution of the average effective arrival rate λ and the throughput/goodput for drones has been studied. Comparing traffic characteristics in models with different numbers of drones allows to judge how the required quality of service can be achieved by choosing the right transmission parameters.
Intellectual System of Preparation of Images from Computer Tomographs
Authors: Sineglazov Victor , Kharchuk Yaroslav
Published: January 2023

Artificial neural networks can be trained on useful signals of the source data, but can not be taught on noisy data, so it is usually performed noise reduction or error compensation. This paper implements a noise reduction model based on artificial neural networks to suppress high-noise components, which is important for optimizing pre-filtering methods. The process of cleaning computers’ tomography scans in medical examinations of patients with tuberculosis is considered as an given problem in which the suppression of noise present in the image is required.. In order to reduce the level of radiation due to it is quite harmful to human. the power of the radiation is reduced. As a result, the ratio of the useful signal to noise is reduced, which causes noise, which contaminates the image and complicates its processing. Additional shadows appears on the image that no objects exist, which can provide false diagnosis. An algorithm for structural-parametric synthesis of convolutional neural networks used in image noise suppression has been developed. Computer tomograms of tuberculosis patients provided by the Research Institute of Pulmonology and Tuberculosis of the National Academy of Medical Sciences of Ukraine were used as a training sample.
Finding the Dynamic Range of Recorders During Impact Tests
Authors: Stakhova Anzhelika , Makarovskyi Serhii
Published: January 2023

In aircraft construction, when creating samples of new equipment, impact tests are often performed, both of individual components and of the entire product. It requires to introduce non-destructive testing devices into production, it is one of the most important factors in accelerating scientific and technological progress, raising the quality and competitiveness of manufactured products. Applying modern means of non-destructive testing, there is the problem of their protection from external vibrations, which affect the sensitivity, accuracy and reliability of high-precision measurements. In such cases the conversion of measuring information during powerful vibration and impact tests, as a rule, is carried out by piezoelectric acceleration sensors. Although to provide impact testing, there is a need to develop and use stand-alone recorders. The main requirements for these recorders are to ensure the autonomy and operability of the recorder on board the test product and to ensure the synchronization of the registration of the impact load.
Improving the Methods of Assessing the Quality of Aircrew Piloting Technique
Authors: Hryshchenko Yurii , Romanenko Viktor , Pinchuk Tetiana
Published: January 2023

The article presents aircraft flight data in the landing approach mode, which was obtained on an integrated flight simulator and in actual flight conditions, processed by various probabilistic-statistical methods. These data were used to assess the quality of flight crew piloting techniques. We have reviewed the methods based on the Neyman–Pearson criterion, and the optimal Bayesian criterion is considered. When using them, we revealed the presence of a deterministic sinusoidal component in the flight parameters. We also used the method of analyzing autocorrelation functions and the method of analyzing the spectra of flight parameters of normalized and unnormalized autocorrelation functions. In a comparative analysis of these methods, we have shown that the most informative approach is the analysis of the spectra of flight parameters of normalized and unnormalized autocorrelation functions. This paper shows that the successful completion of the landing stage largely depends on the accuracy of the aircraft entry to the glidepath intercept point.
Microelectromechanical Gyrovertical
Authors: Vasylenko Mykola , Mahas Maksym
Published: January 2023

Gyroscopic verticals (gyroverticals) are designed to determine the direction of the true vertical on moving objects. Being one of the devices of the orientation system of a moving object, they are used as sensors for the roll and pitch angles of an aircraft (or sensors of similar angles for other moving objects) and serve to create a platform stabilized in the horizon plane on a moving object. The electrical signals taken from the measuring axes of the device are used in flight, navigation, radar systems, visual indicators, etc. Gyroscopic stabilization systems are widely used as the basis of integrated management systems on aircraft and miniature unmanned aerial vehicles for generating signals proportional to the angular deviations of the aircraft in space in terms of roll and pitch angles and for stabilizing and controlling the position in space of optical equipment. At present, sensors based on the technologies of microelectromechanical systems are widely used in small aircraft. Their important advantage is small weight and size characteristics, and the main disadvantage is low accuracy. Such sensors are used in navigation systems and automatic control systems of aircraft. In particular, algorithms for calculating the orientation angles of an unmanned aerial vehicle are known, using information from microelectromechanical angular velocity sensors. However, due to large drifts, an error accumulates in time and, as a result, the operating time is limited.
Barometric Altimeter Based on Microelectromechanical Sensor
Authors: Vasylenko Mykola , Dzhus Viacheslav
Published: January 2023

The paper considers a barometric altimeter based on a microelectromechanical sensor. An algorithm for obtaining height using the BMP180 sensor is presented, which can be used in various fields of technology and industry. The work also used a variety of parts that ensured the quality and accuracy of the altimeter. A program code for calculating the height has been developed. An experimental study of the operation of the apparatus was carried out.
Methods of Processing Data in Measuring Instrument with Non-orthogonal Orientation of Inertial Sensors
Authors: Golitsyn Volodymir , Sushchenko Olha
Published: January 2023

The paper deals with improving methods of processing data in measuring instruments with non-orthogonal orientation of inertial sensors. The method of processing measuring information based on neural networks is represented. The method for searching failures of separate sensors in the redundant non-orthogonal measuring instrument based on neural networks is proposed. The method for widening the dynamic range of redundant non-orthogonal measuring instrument is described. The appropriate calculating procedures are represented in details. Description of the represented methods is accompanied by representation of modelling results. The proposed approach ensures improving accuracy and reliability of measurements. The obtained procedures can be especially useful for designing measuring instruments assigned for application in unmanned aerial vehicles.
About Secondary Energy Resources, Heat Exchange Ventilation
Authors: Voronuk Andrey
Published: January 2023

The article deals with life support systems, the main purpose of such systems is to make the building suitable for human life, or to create comfortable conditions for work. To create a favorable environment, optimal temperature and humidity in all residential and industrial premises, ventilation and air conditioning systems are used. The main goal of the work was the development of a high-tech energy-saving ventilation and air conditioning system with a modern automated control system. At the same time, the main directions of modernization of energy-saving control systems were developed, the hardware support of the energy-saving ventilation system was developed, the choice of the type of recuperator as an energy conservation subsystem was justified, the main elements of the system were calculated, the components of the ventilation and air conditioning system were modeled, a model of the supply-exhaust ventilation system was developed, and experimental tests were carried out research.
Two-digit Quantum-dot Cells Multiplier
Authors: Melnyk Oleksandr , Kozarevych Viktoriia , Kogut Evelina
Published: January 2023

The arrival of the era of nanotechnology was stimulated to the greatest extent by the high rate of development of CMOS-microelectronics. Currently, complementary metal–oxide–semiconductor components have reached quantum-technological limits. In digital nanoelectronics, one bit of information is given by one electron. In the work, computer design using computer-aided design QCADisigner of single-electron arithmetic-logic nanocircuits based on quantum cellular automata is performed. Fragments of three- and five-inputs universal majority elements are used as the basis. It has been proven that the defining property of this class of nanodevices is the group behavior of cells, which is reproduced by the logic of majority functions. The development single-electron full nanoadder and double-bits multiplier have the smallest possible technological nanosizes, ultra-high speed and minimum switching energy consumption.
Visual Object Recognition System
Authors: Vasylenko Mykola , Haida Maksym
Published: January 2023

This article introduces the problem of object detection and recognition. The potential mobility of this solution, ease of installation and ease of initial setup, as well as the absence of expensive, resource-intensive and complex image collection and processing systems are presented. Solutions to the problem are demonstrated, along with the advantages and disadvantages of each. The selection of contours by a filter based on the Prewitt operator and a detector of characteristic points is an algorithm of the system, developed within the framework of object recognition techniques. The reader can follow the interim and final demonstrations of the system algorithm in this article to learn about its advantages over traditional video surveillance systems, as well as some of its disadvantages. A webcam with a video frame rate of 25 frames per second, a mobile phone and a PC with the Matlab2020 programming environment installed (due to its convenience and built-in image processing functions) are required to illustrate how the system works.
Self-tuning Process of the Control Laws of the Aviation Gas Turbine Engine
Authors: Tovkach Serhii
Published: January 2023

The article is devoted to the selection of parameters and evaluation of the efficiency of an aviation engine based on a system approach, when the engine and power plant are considered as subsystems of a higher-level aircraft complex. To solve the problems of multiparameter optimization, complex mathematical models of the entire system, consisting of the aircraft and control systems, taking into account the properties of the used fuels, are developed. The integration of the aircraft engine and the aircraft is carried out on the basis of the conditions for ensuring mass balance, the volume layout of the starting thrust-mass ratio. In combined power plants, it is possible to consider engines of different types, for example, TPrE with parallel or sequential (tandem) arrangement of circuits, TRBEaf and ramjet and steam hydrogen rocket-turbine engines of several types, the parameters of the working process of which are optimized according to the conditions of a typical program flights The adaptation task can be solved by changing both control programs and parameters of intellectual regulators of individual subsystems, as well as the structure of individual subsystems and connections between them. The higher level determines which strategy and which adaptation algorithm to choose in this situation. The optimal behavior model of the system in the current situation is also determined here. At the next level (the level of the technological complex), a strategy for the integration of the control and planning systems of the gas station, technological equipment and information system is formed, depending on the modes of operation of the gas station and the fulfillment of the tasks set before it. The construction of the ACS GTE model in the VisSim modeling software package was completed, measures were taken to stabilize the system. The transfer functions of the main elements of the electronic automatic control system of the GTE were obtained: a speed sensor, a thermocouple, and a pressure sensor. sensor of the angular position, the actuator mechanism of the nozzle-valve, the movement of the aircraft by the pitch angle.
Individual Mobile Navigation System of Way Counting
Authors: Vasylenko Mykola , Lazarevskiy Oleksandr
Published: January 2023

The problem of step counting has been considered for personal navigation while walking and using mobile sensors with low accuracy. Three primary approaches to computing the acceleration vector magnitude in time domain have enabled step counting. When analyzing data from mobile phone sensors for various pedestrian kinds, environmental factors, and their mobility patterns, several methodologies were compared. Except for the approach of normalized auto-correlation based step counting, which only processes short distances, the walking trajectories have been chosen to be long enough (at least 100 meters) to produce statistically representative results. The specifications for a specific step counting system have been developed.
Planning a Flight Task System and the Principle of its Construction
Authors: Sineglazov Victor , Savchuk Serhii
Published: January 2023

This work is devoted to the development of a system for automatic determination of the flight task for unmanned aerial vehicles. To implement such a system, the QT framework (a library of C++ classes and a set of tools for creating cross-platform applications) was used. It is proposed to introduce forecasting and routing modules into the system of automated determination of the flight task. An interface is developed for building a flight task that can be used to download, track key metrics from the unmanned aerial vehicles, and adjust the mission of the flight task. Advanced QT/Qml frameworks were used, which will allow the software product to be used on different operating systems, which will add flexibility in the use of system components.
Experimental Research of Integrated Navigation Systems in Problems of Quadrotor Path Tracking
Authors: Kondratiuk Vasyl , Ilnytska Svitlana , Kutsenko Oleksandr , Sushchenko Olha , Kondratiuk Maryna , Semenenko Oleksandra
Published: January 2023

The article deals deals with experimental research of the integrated navigation, guidance, and control system of quadrotor. The mathematical grounds of the study of the system are represented. Algorithm of functioning the integrated system is represented. Equations of the optimal estimation are given. Features of tested equipment are described. The quadrotor trajectory in the horizontal plane is simulated. Coordinates of the topocentric reference frame are researched. The results of the experimental test are shown. The components of velocity are represented. The graphical dependences on the yaw, pitch, and roll are shown. The obtained results can be useful for creating perspective navigation systems for quadrotors. They allow to improve the quality of quadrotor navigation.