bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on mission characteristics-based evaluation model of flight test workload
Authors: Mi Yi , Wang Anli , Song Hao 
Published: February 2021

Abstract
As a product of modern industrial cutting-edge technology, a large civil aircraft needs to undergo rigorous flight test before entering the aviation market, which fully ensures the safety of aircraft and its system. This makes the aircraft meet the airworthiness standards and requirements. The flight test of civil aircraft is a complex system project, which the top-level planning throughout the flight test period has an important influence on progress control and flight test efficiency of a new type aircraft. The core content of the top-level plan is the evaluation of flight test workload with consideration of test aircraft quantity. This paper proposes a flight test workload analysis and evaluation model based on the types of test missions through the analysis of the characteristics of civil aircraft flight test mission, which provides a feasible method for quantitative evaluation of flight test workload.
Text data-augmentation using Text Similarity with Manhattan Siamese long short-term memory for Thai language
Authors: Phreeraphattanakarn Thananya , Kijsirikul Boonserm 
Published: February 2021

Abstract
In this paper, we address the issue of using small text datasets for learning of neural networks. We explore the method that is used with image and sound datasets to augment data for increasing the performance of models. We then leverage this data augmentation technique to expand the training set of textual data. A great challenge in our dataset is that the amount of data is insufficient for training models. For this reason, we propose a method for augmenting text data specifically for Thai language which is based on Text Similarity and using the model to determine the semantic relationship between two sentences. The experimental results indicated that our proposed method is able to improve the performance of text classification.
An Experimental Model of the Collect/Report Paradigm
Authors: Ivanova Krassimira Borislavova 
Published: February 2021

Abstract
In the Big Data community, the “Map/Reduce Paradigm” is one of the key enabling approaches for meeting the continuously increasing demands on computing resources imposed by massive data sets. Today it is implemented in many open source projects. The popularity of Map/Reduce is due to its high scalability, fault-tolerance, simplicity and independence from the programming language or the data storage system. At the same time, Map/Reduce faces a number of obstacles when dealing with Big Data. A possible solution of them may be the Collect/Report Paradigm (CRP) and Natural Language Addressing (NLA) approach. It is suitable for storing Big Data in large information bases located on different storage systems – from personal computers up to cloud servers. An experimental Model of the CRP is presented in this paper. An experimental implementation of the CRP to process and store data is outlined. The structures of the input and output data are in the form of RDF triplets. The ease of implementation of this model and the benefits of its use are discussed.
On-site research with a thermal camera on industrial heating
Authors: Yosifova Veneta , Stoimenov Nikolay , Haralampieva Milena 
Published: February 2021

Abstract
This paper submits the on-sight research made with a thermal camera for investigating the practices of heating technologies in industrial premises. The experiments are made during the winter season of 2019/2020 and give a preliminary overview of the heating methods, their positive and negative effect, and their contribution to energy consumption and efficiency. Models for worker’s practices and space zoning are observed to optimize heat distribution. Based on the experimental work a series of findings are made and described for future recommendations in heating systems design for industrial buildings.
Research of design an educational modular 5 axis milling machine
Authors: Anania F D , Pena A E , Canarache R M 
Published: February 2021

Abstract
Industrial CNC machine tools are supplied as closed architecture systems. Their structure, kinematics and CNC controllers are designed to be used exclusively for their basic purpose, without any possibility of being changed. Reconfiguration is seen as the ability to add or remove modules from the machine, to be equipped with additional degrees of freedom (axes). For the concept to become a reality, it is necessary that the machine tool can be easily assembled and disassembled by an end-user and can adapt to changing projects or machining requirements. The approached of this research was to develop a 5-axis modular machine tool, with technological capabilities similar to industrial ones, at an affordable level of development costs and suitable to be used for teaching CAM techniques for future engineers.
Review of existing methods and tools for part processing limited to polyhedral surfaces
Authors: Vasileva D , Lefterov E 
Published: February 2021

Abstract
Looking retrospectively at the many years of efforts by a number of researchers to develop a method for machining by cutting of polyhedral parts, it is found that the obtained results were not particularly satisfactory. For this finding, it is not possible to substantiate justify the basis in this paper, but the reason can be briefly indicated. One of the less successful methods has been created, though unintentionally, on the basis of fundamental kinematic cutting schemes (FKCS). The uniform rotary motion B, of the stock is kinematically related to the straight-line reciprocating motion C of the simple lathe cutting tool. Uniform, straight forward motion is also performed from the stock and it is a longitudinal feed movement. This method has some disadvantages: changing the actual angles of the tool during very wide cuts between 0° to 45°; variable size chip which is a source of periodic force loading of the tool and the stock and the correct reciprocating motion is realized by a CNC machine and the deviations from the exact shape being copied relative to the shape of the part surface of the machined area.
Fuel consumption and emission improvements obtained using a mild hybrid electrical system on a vehicle equipped with a manual gearbox
Authors: Saragea Ștefan , Frățilă Gheorghe , Badea Gabriel 
Published: February 2021

Abstract
The latest emission requirements for vehicles requires major improvement in vehicles fuel consumption and emission performance. For entry level range of vehicles, in order to keep the production costs low, the simplest choice of hybridization is the mild-hybrid system with integrated starter-generator (ISG). This paper contains a model of a mild-hybrid electric vehicle equipped with a manual gearbox and a model of conventional vehicle with focus on the emission performance. The goal of this paper is to find out the fuel consumption and emission of a mild hybrid electric vehicle by simulation and to show the improvements compared to a similar vehicle equipped with a conventional powertrain.
Simplified mathematical model for frontal impact study
Authors: Manea A M , Iozsa D , Stan C 
Published: February 2021

Abstract
The structure of the front compartment is built to provide safety to passengers during an impact. Safety is ensured by designing structures capable of taking up much of the impact energy. During an impact, the energy of the impact is consumed by the ability of the body structure to deform. Thus, a large part of the kinetic energy of the impact is transformed into deformation energy. It ensures that decelerations are reduced in a short period of time to the limit that passengers can bear. Two mathematical models are proposed for the study of the frontal impact between two vehicles. In the mathematical model the component elements of the frontal compartmental structures are treated separately. Two simplified numerical models with two degrees of freedom are proposed. The first mathematical model is of the table-spring type, and the second is the mathematical model of the table-spring-shock absorber type. The body elements and the main subassemblies of the vehicle are considered to be two concentrated table bodies. The connection between these bodies will be made by elastic elements and damping elements. Based on Lagrange’s generalized equations, the equations of motion necessary for the impact study will be obtained. Furthermore, the solving of the numerical systems of the proposed models will be done with the help of the modelling, simulation and analysis environment offered by the MATLAB Simulink software. In this environment, the main initial parameters and impact conditions between the two bodies will be established and block schemes will be built for both systems of equations. With the help of these mathematical models it is desired to determine the maximum deformation recorded by each vehicle during the frontal impact between the two.
The influence of combustion properties of fuel materials upon human evacuation in case of fire
Authors: Grigoras Z C , Ibanescu M 
Published: February 2021

Abstract
The purpose of this article is to analyze the variation of the tenability criteria (convected heat, radiant heat, toxic gases and smoke visibility) on the main evacuation paths inside of an educational building, in case of fire. The analysis is performed by numerical simulation for three different fire scenarios. The fire load density of fire space (an office type room) is the same, but the main combustible material is changed: wood, plastic and polyurethane foam. The analyzed building can house a great number of people (over 600) and its inner atrium could facilitate the spread of smoke and hot gases in case of a real fire. According to the numerical analysis, it has been concluded that the convected heat variation is not a significant one (within the engineering limits), but the radiant heat, toxic gases and smoke visibility are highly dependent on the type of considered combustible materials.
Date preparation module of automated metallurgical products production system
Authors: Ponomareva O , Porshnev S , Borodin A , Mirvoda S 
Published: February 2021

Abstract
The article discusses the data preparation module of the automated metallurgical production system, which provides data to obtain from heterogeneous sources (ASS, CIS, MES, ERP systems ), convert heterogeneous data into a convenient form for subsequent storing, configure the converting rules and output heterogeneous data relevant to the query. Proposed components of the data preparation module: logical structure of data preparation module, algorithm of data preparation module operation, the link with simulation modeling and other modules, the list of technical equipment. A fragment of the interface of the data preparation module is being converted.
Forming the straight flange of a rib by pulsed-magnetic field pressure
Authors: Kurlaev N V , Matveev K A , Ahmed Soliman M E , Detinov M B 
Published: February 2021

Abstract
In the production of aircraft, the most common method of manufacturing a straight flange is magnetic-pulse stamping, since it is highly efficient in small-scale production due to its high versatility and simplicity of technological equipment. Among the sheet metal parts of the aircraft, there is a fairly large number of parts with straight sides, which are made of a flexible elastic medium. In this paper, the straight flanging of the D16AM aluminum alloy during magnetic pulse forming was investigated by using the LS-DYNA simulation program. The operation of sheet bending is used to form the side wall of the part. If the bent side has a straight shape, then bending stresses occur along the bend radius, and the side wall remains unstressed. This operation is called «straight flange bending». With impulse shaping, there is a great possibility to control the shape of the workpiece during deformation by distributing pressure over its area. Excessive pressure is created on the workpiece after it adjoins the die. This pressure contributes to the redistribution of stresses and equalizes them along the height of the section of the workpiece, while inertial forces change the stress-strain state of the workpiece. This study, in particular, concerns an example of numerical simulation of the electromagnetic forming of a straight flange with the obtained mesh shape of a workpiece and the results of its calculations were summarized in the form of a nomogram.
Evaluation of the efficiency of dry electrostatic cooling by the transfer current
Authors: Khripunov N V 
Published: February 2021

Abstract
Practical examples and physical mechanisms of dry electrostatic cooling efficiency when processing materials by cutting are considered. The assumption is made that efficiency of dry electrostatic cooling process depending on the mode of equipment operation directly depends on the value of electric charge carried by air flow - transfer current. A stand has been developed to measure the current flowing from an grounded plate under the action of dry electrostatic cooling airflow. Using the stand, experiments were made with the «Varkash» dry electrostatic cooling unit. As a result of the experiments, a relationship was found between the transfer current from air pressure and the length of the air flow. Experiments were made on turning structural steel with high-speed steel tools, varying the air pressure of the dry electrostatic cooling unit and the distance from the nozzle to the cutting zone. Based on the results of the experiments, it was verified that the transfer current corresponds to the efficiency of dry electrostatic cooling during cutting.
Perspectives for use of composite and polymer materials in aircraft construction
Authors: Zolkin A L , Galanskiy S A , Kuzmin A M 
Published: February 2021

Abstract
One of the main indicators characterizing the quality of modern products are reliability indicators. The detection and development of effective measures to combat corrosion of aviation materials and structures is one of the most important areas of ensuring safety, high operational reliability and efficiency of modern aviation technology. It is one of the modern trends in the development of aviation at this stage of development of aircraft construction. This article discusses the technological aspects of the development of the use of composite materials in aircraft construction at the present stage of society development. The aircraft industry is one of the high-tech industries where modern polymer and composite materials play a decisive role. In this regard, the development of composite and polymer materials is the future of all the world aviation.
Optimization of the combined beneficiation scheme and increase in the performance of highly efficient refractory gold-bearing ores under development
Authors: Askarova G Y , Shautenov M R , Nogaeva K A 
Published: February 2021

Abstract
The growth in consumption and cost of precious metals is forcing gold mining companies to expand their raw material base and study and develop processes aimed at increasing the recovery of gold from ores and concentrates. The reserves of rich, easily-enriched gold-bearing mineral raw materials are practically exhausted. To maintain the volumes of extraction of precious metal, the domestic gold-extracting industry constantly involves new gold deposits in processing, resumes operation of previously abandoned and “mothballed” quarries and landfills, mines and mines, processes man-made dumps of many mining and processing plants containing a certain amount of metals (in as associated components or not completely extracted during primary processing).
Classification of objects of technological preparation in the machining production
Authors: Bazrov B M 
Published: February 2021

Abstract
As the main objects of technological preparation for the production of parts, the part, the technological process of its manufacture, the machine tool, the machine retaining device, and the tool setup are considered. The analysis of the classifications of the listed objects showed the absence of full-fledged classifications of parts, technological processes for their manufacture and instrumental setups; the classification of machine tools and machine retaining devices does not reflect the links between them and the technology of parts manufacturing. The noted shortcomings of the listed classifications lead to an increase in labor intensity and a decrease in the quality of technological preparation of production. The article describes a methodological approach to the construction of technological classifications, reflecting the relationship between objects and the technology of parts manufacturing. Characteristics of the objects associated with the technology of parts manufacturing are proposed as distinctive features for the construction of technological parts classifications, technological processes, machine tools, machine retaining devices and instrumental setups. The use of technological classifications will reduce labor intensity and improve the quality of technological preparation of production.
Differential mode pulse minimization by using the genetic algorithm in the bus
Authors: Gazizov Rustam R , Gazizov Ruslan R , Gazizov T T , Kalinina M N 
Published: February 2021

Abstract
The article considers an optimization of a spacecraft component. The choice of length of the power supply was carried out using a genetic algorithm. The main purpose was decreasing the maximum voltage amplitude in the power supply bus. As an excitation we used a differential excitation of a trapezoidal pulse. Comparison of the results of signal simulation after optimization for two approaches is presented, that differed by various numbers of chromosomes and populations. It was found that the two approaches are not differ significantly in the simulation results. We decreased the maximum voltage amplitude by 270 times with using the genetic algorithm.
Linguistic approach to the classification problem based on the multiset theory
Authors: Demidova L A , Sokolova Ju S 
Published: February 2021

Abstract
The problem of developing generalizing decision rules for object classification, which arises under conditions of inaccurate knowledge about the values of objects’ attributes, and about the significance of the attributes themselves, has been considered. The approach to the binary classification of objects, which implements the representation of inaccurate knowledge based on linguistic variables and allows one to consider various strategies for the formation of generalizing decision rules for classification using the tools of multiset theory, has been proposed. The example of the formation of generalizing decision rules of binary classification for the set of competitive projects evaluated by the group of experts, confirming the effectiveness of the proposed approach, has been considered. A herewith, visualization of objects, the values of the features of which are the frequency of setting a certain score according to the a priori given rating scale by all experts, in a two-dimensional space using the non-linear dimensionality reduction algorithm named as the UMAP algorithm, has been implemented. Based on the results of visualization and cluster analysis of the initial set of competitive projects, the “noise” project, which negatively affects the results of the formation of generalizing decision rules of binary classification, was identified and removed from further analysis.
Parametrization of bass diffusion model on COVID-19 first wave data
Authors: Škraba A , Vavtar B , Stanovov V , Semenkin E , Stojanović R 
Published: February 2021

Abstract
The paper addresses the development of the system for the parameterization of the Bass Diffusion Model on Covid-19 Data. Continuous model developed by the principle of system dynamics is presented. The parameters of the model are tuned to fit the data with genetic algorithm in Powersim simulation tool. The validation is performed by standard simulation validation techniques. The input data used in the experiments were gathered by publically available databases. In particular, the data collected in Austria, France, Italy, South Korea, Slovenia and Swiss were considered in this study. The results have shown that the simple model with is capable of predicting the growth with S-shaped curve with high accuracy.
A reliability index for fuzzy expert group criterion
Authors: Poleshchuk O 
Published: February 2021

Abstract
In the paper, a fuzzy expert group criterion is presented in the form of a linguistic variable with the properties of completeness and orthogonality. The expert group criterion is created based on individual expert criteria of evaluation a quantitative or qualitative characteristic. The construction is carried out on the basis of the minimum loss of information contained in the individual criteria. For neighboring terms (concepts) of the criterion, analogues of probabilities of errors of the first and the second kinds are determined, as well as the reliability index, taking into account the zones of uncertainty of their membership functions. The reliability index of fuzzy expert group criterion is determined based on the reliability indexes of all the neighboring terms.
Problems of personal data and information protection in corporate computer networks
Authors: Zolkin A L , Abdulmukminova E M , Malikov V N , Lepshokova A N 
Published: February 2021

Abstract
The article discusses the problems of personal data and information protection from intruders as well as methods of authentication and identification in corporate networks. Various methods of authentication and identification in computer networks are presented. Their comparative analysis is carried out, the features and disadvantages in various areas of use are highlighted, risks and possible damage from violation of data confidentiality are analyzed. The magnitude of violations of confidentiality, availability and integrity of information is growing every year, at the same time, the caused damage is growing. This situation makes it necessary for information security specialists to analyze all the risks of illegal access to information more and more thoroughly, and then resort to the introduction of modern means authentication, use new encryption methods, increasingly generate new passwords to access the system. Today, there are many ways and methods of authentication, but the specific of their application depends on the location of the information storage and its value. Meanwhile, authentication methods are not perfect protection methods, they are also vulnerable and here the situation is mostly depends on the skills of the attackers. In addition, the article discusses the problems of information security threats to flash drives, analyzes the FAT32 and NTFS file systems of flash drives as well as their vulnerabilities to malicious programs. The features of the algorithm of virus action on flash drives are highlighted. Today, there are many ways and methods of flash drives protection, but the specifics of their use depends on the location of the information storage and its value.
Analysis of unilateral event-continuous systems
Authors: Shornikov Yu V , Popov E A 
Published: February 2021

Abstract
Numerical analysis of unilateral event-continuous processes in comparison with traditional simulation algorithms for discrete-continuous systems is addressed. An original integration step size control algorithm guaranteeing correct detection of unilateral events is given. The algorithm is tested on a typical problem. Simulations are carried out in modern computer environments for modeling and simulation of complex dynamic systems of the mentioned class. A comparative analysis of the application of the software environments to event-continuous processes with unilateral events is presented.