scholarly journals INVESTIGATION OF THE PARAMETERS OF WAREHOUSE COMPLEXES USING PETRI NETS

2021 ◽  
pp. 70
Author(s):  
Y. DEMCHENKO ◽  
V. MALASHKIN ◽  
A. DOROSH ◽  
I. SKOVRON
Keyword(s):  
Simulation Model ◽  
Petri Net ◽  
Economic Assessment ◽  
Practical Significance ◽  
Technical Equipment ◽  
Universal Method ◽  
Technological Parameters ◽  
Operational Conditions ◽  
Advantages And Disadvantages ◽  
Packaged Goods

The purpose. In modern conditions, the task of improving systems for storing material stocks has significant scientific and practical significance. At the same time, the nature and degree of influence of the parameters of the incoming flow of goods on the required technical equipment of warehouses from the standpoint of logistics and a systematic approach have been insufficiently studied. The absence of a final solution to the problem of developing a universal methodology for determining rational technical and technological parameters of warehouses for packaged goods formulated the goal of the study, which is to determine the rational equipment of a warehouse complex on the basis of simulation modeling of the process of its functioning, formalized by a Petri net. Methodology. In the work, the authors present a methodology for formalizing the process of functioning of a transport and warehouse complex using a Petri net in the QPNet environment. The technique of technical and economic comparison of options for equipping a warehouse complex, which is based on the use of modified reduced costs, is presented. Results. The paper reviews the existing imitation models of warehouse complexes, identifies their advantages and disadvantages. On the basis of the analysis performed, a simulation system was determined for the development of a model of a warehouse complex. The article presents a universal method for determining the rational technical and technological parameters of warehouses for packaged goods using a simulation model of a warehouse, the technological process of which is represented by a Petri net. With the developed simulation model of the composition, a series of experiments were performed, differing in the operational conditions of operation, as a result of which a set of technical and operational indicators of the warehouse complex was obtained. The obtained indicators of the warehouse functioning became the basis for determining its rational technical equipment. The practical significance of the methodology presented in the work for constructing a universal model of a warehouse complex and a technical and economic assessment of the indicators of its functioning will make it possible to more accurately determine the rational number of technical means and technical equipment in the design of new or reconstruction of existing transport and warehouse complexes.

scholarly journals ANALYSIS OF TECHNICAL AND TECHNOLOGICAL PARAMETERS OF UKRAINIAN PRE-PORT RAILWAY STATIONS

2021 ◽  
pp. 36
Author(s):  
O. CHERNOVA ◽  
R. VERNYHORA ◽  
A. OKOROKOV ◽  
A. KIMAN
Keyword(s):  
Effective Interaction ◽  
Throughput Capacity ◽  
Practical Significance ◽  
Technical Equipment ◽  
Technological Parameters ◽  
Scientific Publications ◽  
Sea Transport ◽  
Railway Stations ◽  
Railway Infrastructure ◽  
Low Efficiency

Purpose. The aim of the work is a comprehensive analysis of the technical and technological parameters of pre-port railway stations in Ukraine as key elements of the port infrastructure, ensuring the interaction of railway transport with seaports. Methodology. In the process of research, the methods of analysis and synthesis were used to study the content and the main provisions of scientific publications on the issues of establishing effective interaction between rail and sea transport,  with their subsequent comparison and generalization; methods of statistical analysis for research and systematization of technical equipment of port stations. Results. More than 60% of export cargoes go through Ukrainian ports; while 75% of export volumes are delivered to ports by rail. Currently, due to changes in the conditions for the functioning of the economy and the transport system of Ukraine, there is an imbalance between the capacities of ports and the port railway infrastructure for processing freight flows. Based on the analysis, it was found that the throughput of most stations does not correspond to the prospective, and for some stations - and the actual, volumes of work. In particular, for some stations, the capacity of track development is insufficient; a significant problem is also the low efficiency of the shunting means. An effective way to solve the problem of reducing the imbalance in the processing capacity of ports and the pre-port railway infrastructure is public-private partnership in the implementation of appropriate investment projects, the assessment of which should be carried out using modern scientific approaches. Scientific novelty. The authors have systematized the existing technical equipment of the port stations of Ukraine from the point of view of its sufficiency to ensure the existing and prospective volumes of transportation. Practical significance. The results obtained make it possible to provide a scientific basis for further research into assessing the throughput capacity of pre-port railway stations and the effectiveness of infrastructure projects aimed at increasing it.

scholarly journals Polymorbidity: definition, classifications, prevalence, estimation methods and practical significance

2018 ◽  
Vol 20 (4) ◽  
pp. 243-249
Author(s):  
S V Voronin ◽  
D V Cherkashin ◽  
I V Bersheva
Keyword(s):  
Practical Significance ◽  
Estimation Methods ◽  
Universal Method ◽  
Advantages And Disadvantages ◽  
Prevalence Estimation ◽  
Literary Sources ◽  
Depth Study ◽  
Definition Of ◽  
Classification Information ◽  
Social Importance

Based on the analysis of Russian and foreign literary sources, the definition of the concept of polymorbidity is given, its classification, information on prevalence, measurement methods and practical significance are given. It is emphasized that at present in the literature the concepts of polymorbidity, comorbidity, multimorbidity coexist, while there is no universally accepted definition of them. This uncertainty is historically conditioned and is associated with the use of these concepts by various scientific schools. In most modern literary sources, polymorbidity (multimorbidity) refers to a combination of two or more chronic diseases in one patient. At present, a considerable number of different methods of measuring polymorbidity are used, which have their own advantages and disadvantages, and a universal method has not been developed. The most convenient for assessing polymorbidity is currently recognized polymorbidity index Charlson. Due to the lack of unified approaches to the measurement of polymorbidity, as well as taking into account the fact that studies are conducted in different population samples, the published figures for the prevalence of polymorbidity vary considerably. Emphasis is placed on the fact that polymorbidity is a multifaceted problem that has not only clinical but also economic and social importance, which requires a further in-depth study.

Microsurgery training: for whom and how?

2021 ◽  
Vol 24 (1) ◽  
pp. 61-72
Author(s):  
I. V. Reshetov ◽  
V. S. Melnikov ◽  
Yu. V. Babaeva ◽  
O. I. Starceva ◽  
D. V. Melnikov
Keyword(s):  
Plastic Surgery ◽  
Learning Process ◽  
Universal Method ◽  
Short Term ◽  
Advantages And Disadvantages

In 2011, the staff of the Department of Plastic Surgery, Sechenov University (Moscow, Russia), organized three-stage microsurgical courses. Having analyzed the advantages and disadvantages of the previous practical course, it was created according to the principle “from simple to complex”, integrating theoretical material into the practical preparation for the formation of a microsurgical outlook.According to the authors, dividing the learning process into short-term stages allows students to gradually immerse themselves in the microsurgical world, while they themselves regulate the frequency of training and the need for further improvement of skills. Due to the phasing, the course becomes more accessible and makes it possible to popularize microsurgery as a universal method for solving surgical problems.

scholarly journals ANALYSIS OF EXTERNAL ENGINEERING NETWORK METHODS

2020 ◽  
Vol 4 (157) ◽  
pp. 7-11
Author(s):  
V. Zhvan ◽  
V. Donenko ◽  
S. Kulish ◽  
A. Taran
Keyword(s):  
Physical And Mechanical Properties ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Technological Parameters ◽  
Optimal Method ◽  
Advantages And Disadvantages ◽  
Analytical Review ◽  
Conducting Research ◽  
The Cost ◽  
Selection Of

The article is devoted to the effective analysis of trench and trenchless pipeline laying technologies. In the course of the work, an analytical review of pipeline assembly was performed, the main technological parameters, the scope of each method, and their advantages and disadvantages were determined. List of considered pipeline laying methods: trenching, horizontal directional drilling, mechanical puncture, hydraulic puncture, microtunneling and punching. The article analyzes the classical trench method and the most widely used trenchless ones: horizontal directional drilling; mechanical puncture; hydraulic puncture; microtunneling; punching. Each of these methods has several advantages and disadvantages. The choice of the optimal method of laying the pipeline depends on many factors: the physical and mechanical properties of soils and hydrogeological conditions, the length and diameter of the pipeline, the presence of other communications, buildings and structures, as well as the budget that customers have. Work time is the last deciding factor. Based on the results of the analysis of pipeline laying technologies and expert survey of construction industry experts, the cost table of each method was compiled, outlining the main characteristics of the technology: length of pipeline, speed of work, scope, cost, and the advantages and disadvantages of each of the considered methods. The conclusions about the use of each of the pipeline laying methods were made. Each of the methods has its advantages and disadvantages, so to choose the method of work it is necessary to conduct a comprehensive assessment of technological parameters, cost, scope and timing of work. The cost of lay-ing the pipeline consists of the following factors: conducting research; selection of diameter and determination of pipeline length; choice of laying method and equipment necessary for the works; selection of equipment, shut-off and control equipment and other materials arranged on the pipeline; terms of performance of works. Taking into account these factors, an estimate is made, which determines the cost of installation of a particular pipeline. After the analysis, we can conclude that among the methods of trenchless laying of pipelines can be identi-fied horizontally directional drilling, it is this method of laying the pipeline will be appropriate to use for our region. The drilling technique allows to carry out pipelines under obstacles, to pull long segments of networks, to repair site damage. This method is universal and can be used in almost any environment. Keywords: trenches, horizontal directional drilling, mechanical puncture, hydraulic piercing, microtunnelling, punching, pipeline.

scholarly journals COMPARATIVE ANALYSIS OF COMPACT METHODS REPRESENTATIONS OF GRAPHIC INFORMATION

2021 ◽  
Vol 1 (37) ◽  
pp. 130-143
Author(s):  
O. Gertsiy
Keyword(s):  
Comparative Analysis ◽  
Communication Systems ◽  
Video Data ◽  
Transport Infrastructure ◽  
Practical Significance ◽  
Jpeg 2000 ◽  
Advantages And Disadvantages ◽  
Graphic Information ◽  
The Cost ◽  
And Storage

The main characteristics of graphic information compression methods with losses and without losses (RLE, LZW, Huffman's method, DEFLATE, JBIG, JPEG, JPEG 2000, Lossless JPEG, fractal and Wawelet) are analyzed in the article. Effective transmission and storage of images in railway communication systems is an important task now. Because large images require large storage resources. This task has become very important in recent years, as the problems of information transmission by telecommunication channels of the transport infrastructure have become urgent. There is also a great need for video conferencing, where the task is to effectively compress video data - because the greater the amount of data, the greater the cost of transmitting information, respectively. Therefore, the use of image compression methods that reduce the file size is the solution to this task. The study highlights the advantages and disadvantages of compression methods. The comparative analysis the basic possibilities of compression methods of graphic information is carried out. The relevance lies in the efficient transfer and storage of graphical information, as big data requires large resources for storage. The practical significance lies in solving the problem of effectively reducing the data size by applying known compression methods.

scholarly journals Mathematical Model of Pressure Formation Process along the Helix Channel Length of Screw Grinder

2020 ◽  
Author(s):  
Valery Pelenko ◽  
Ilkhom Usmanov ◽  
Vyacheslav Pokholchenko ◽  
Irina Smirnova
Keyword(s):  
Energy Consumption ◽  
Mathematical Description ◽  
Analytical Description ◽  
High Energy ◽  
Channel Length ◽  
Operating Conditions ◽  
Technical Equipment ◽  
Mining Equipment ◽  
Technological Parameters ◽  
Total Energy Consumption

The improvement of the technical equipment effectiveness is currently becoming particularly important. This applies not only to large and high-energy-intensive machines, but also to household appliances, the total energy consumption of which often exceeds the energy consumption of the overall equipment. These types of devices include, in particular, grinding and cutting equipment. The mathematical description of the processes carried out on this equipment is generalized and can be extended to a wider class of machines, including waste processing and mining equipment. The technological parameters, the design of screw grinders, and the processes of movement, deformation, extrusion and cutting carried out in them are characterized by a significant number of factors affecting the energy intensity. The main ones are the geometric parameters of the screw, machine’s body, cross knife, grinding plate’s thickness, the number and diameter of holes in it, as well as the product’s physical-mechanical characteristics and operating conditions. The most important for the mathematical description are the zones and processes where the main share of the consumed power is spent. The complexity of their analytical description is due to a simplified consideration of either individual technological zones of grinders’ existing designs, or the use of unreasonable simplifications.

scholarly journals An Approach to the Construction of a Network Processing Unit

2019 ◽  
Vol 26 (1) ◽  
pp. 39-62
Author(s):  
Stanislav O. Bezzubtsev ◽  
Vyacheslav V. Vasin ◽  
Dmitry Yu. Volkanov ◽  
Shynar R. Zhailauova ◽  
Vladislav A. Miroshnik ◽  
...  
Keyword(s):  
Simulation Model ◽  
General Purpose ◽  
Network Processor ◽  
Processing Unit ◽  
Use Case ◽  
General Purpose Processor ◽  
Software Products ◽  
Processor Architectures ◽  
Advantages And Disadvantages ◽  
Processor Unit

The paper proposes the architecture and basic requirements for a network processor for OpenFlow switches of software-defined networks. An analysis of the architectures of well-known network processors is presented − NP-5 from EZchip (now Mellanox) and Tofino from Barefoot Networks. The advantages and disadvantages of two different versions of network processor architectures are considered: pipeline-based architecture, the stages of which are represented by a set of general-purpose processor cores, and pipeline-based architecture whose stages correspond to cores specialized for specific packet processing operations. Based on a dedicated set of the most common use case scenarios, a new architecture of the network processor unit (NPU) with functionally specialized pipeline stages was proposed. The article presents a description of the simulation model of the NPU of the proposed architecture. The simulation model of the network processor is implemented in C ++ languages using SystemC, the open-source C++ library. For the functional testing of the obtained NPU model, the described use case scenarios were implemented in C. In order to evaluate the performance of the proposed NPU architecture a set of software products developed by KM211 company and the KMX32 family of microcontrollers were used. Evaluation of NPU performance was made on the basis of a simulation model. Estimates of the processing time of one packet and the average throughput of the NPU model for each scenario are obtained.

scholarly journals SPECIFICS OF FORECASTING METHODOLOGY INDUSTRIAL INJURIES AND PROFESSIONAL DISEASES

2021 ◽  
pp. 36-42
Author(s):  
Yury POLUKAROV ◽  
Olena ZEMLYANSKA ◽  
Nataliia KACHYNSKA ◽  
Liudmyla MITIUK
Keyword(s):  
Occupational Safety ◽  
Preventive Measures ◽  
Occupational Injuries ◽  
Practical Significance ◽  
Morbidity Rate ◽  
Universal Method ◽  
Mathematical Tool ◽  
Information Analysis ◽  
Average Value ◽  
Analysis System

Purpose. Substantiate the need for development of new scientific and methodological foundations for forecasting occupational injuries and illnesses. Methodology. Analyze existing methods of occupational injuries and illnesses forecasting, propose a new algorithm for calculation of their levels, set scientific and methodological requirements to information analysis system used for the prevention of occupational illnesses. Findings. Modern methods of forecasting injuries make it possible to assess the effectiveness of preventive measures. However, there is no universal method for analyzing the occupational morbidity due to the different specifics of disease causes and manifestations which do not allow to conduct a realistic assessment of labor protection in a particular area over a given period of time. Therefore, it is the reduction in the level of occupational injuries and illnesses compared to the data obtained by the forecasting method that may be indicative of preventive measures effectiveness. At the same time, development of information analysis system of personal protective equipment continues to be a pressing issue (PPE). Originality. It has been proposed to develop a special mathematical tool for determining loss reduction and information analysis system, which will provide a forecasted estimate of occupational morbidity at an enterprise. To obtain a reliable forecast it is important to identify the average value of cases over a given period of time, which has been considered in this paper. Conclusions and Practical Significance. There are numerous methods available for analysis of occupational injuries and illnesses. Most of them, however, are unfit for the assessment of occupational diseases. Since chronic occupational illnesses have a cumulative nature, the rate of work-related diseases is more predictable than that of injuries and accidents. This makes it possible to determine the “occupational morbidity rate” provided that the time spent by workers in the area of exposure to occupational hazards is recorded together with reference data on the conditional level of exposure to each hazard. Keywords: forecasting, injuries, occupational morbidity, occupational safety activities, hazard, information analysis system.

scholarly journals STRUCTURAL DEVELOPMENT AND RESEARCH OF TECHNOLOGICAL PARAMETERS OF MACHINES FOR CENTRIFUGAL -PLANETARY VIBRATION TREATMENT

2020 ◽  
pp. 41-50
Author(s):  
Leonid Yaroshenko ◽  
Igor Kupchuk ◽  
Mykhailo Zamrii
Keyword(s):  
High Efficiency ◽  
Metal Removal ◽  
Three Dimensional ◽  
High Hardness ◽  
Working Environment ◽  
Repeated Loading ◽  
Structural Development ◽  
Technological Parameters ◽  
Advantages And Disadvantages ◽  
Wide Range

The paper analyzes current state and prospects of further development of technology and equipment for mechanization and automation of finishing and cleaning of details. It is stated that the most effective for this purpose are the methods of abrasive machining, which include bulk galvanizing, vibration, centrifugal-rotary and centrifugal-planetary processing. These methods reduce the complexity and cost of processing, which in some cases reaches 20% of the total cost of manufacturing parts. Each of these methods has a different level of efficiency, certain advantages and disadvantages, the level of versatility and scope of effective application. The processes of vibration processing are quite deeply studied, for its industrial mass-produced technological equipment, but they have certain shortcomings that limit their use for further widespread implementation. Centrifugal-rotary processing is a more productive process of three-dimensional finishing and cleaning treatment, but its scope is limited by the possibility of processing parts that are not complex, usually flat. The most productive methods of finishing and cleaning of details include centrifugal-planetary volume processing which high efficiency is caused by repeated loading of particles of working load by inertial forces that creates preconditions for the solutions of a wide range of technological problems, for example, processing of details of difficult form, small weight and the sizes from materials of high hardness or viscosity that represents a serious problem for other methods of volume processing. The constructive scheme is offered in the work and the influence of the composition of the abrasive free-granular working environment on the productivity of the machine for centrifugal-planetary processing of details is investigated. The kinetics of metal removal from the surface of machined parts using different types of abrasive working environment is analyzed. The results of comparative machining of parts in a torus vibrating machine and a machine for centrifugal-planetary machining are given. It is shown that the simultaneous use of centrifugal-planetary and vibration processing methods allows to increase the intensity of the process while ensuring high quality machining of parts of relatively complex shape. The constructive scheme of the machine which allows to implement the specified combined method of processing is offered and described.

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