scholarly journals Designing the transport and logistics systems resistant to structural failures

2020 ◽  
pp. 1-9
Author(s):  
Azret Ahmatovich Kochkarov ◽  
Danil Vladilenovich Yatskin ◽  
Rasul Ahmatovich Kochkarov
Keyword(s):  
Structural Stability ◽  
Optimization Theory ◽  
Sustainability Indicators ◽  
Logistics System ◽  
Logistics Systems ◽  
Optimization Task ◽  
The Matrix ◽  
Structural Failures ◽  
Feasible Solutions ◽  
The Impact

This article is dedicated to designing of the transport and logistics systems with built-in resistance to structural failures. The sustainability indicators reflect the impact of the failure of one or several hubs (communication channels) upon working capacity of the already functioning system. In the process of designing the system, the sustainability indicators also provide opportunities for optimizing its structure from the perspective of set reliability expectations. The authors give attention to the modeling of the transportation and logistics system on the basis of theoretical-graph toolset, as well as propose sustainability indicators and articulation of optimization task. The structure of transportation and logistics system is described using the instruments of graph theory, definition of the task is presented using the criteria of optimization theory, and limitations are the feasible solutions on graphs are established in the matrix form. The authors suggest a theoretical-graph description of the structure of the transportation and logistics systems, propose multiobjective goal setting, and introduce the concept of structural stability based on the indexes and their threshold values. Proposal is made on the approach towards designing the transport and logistics systems with set parameters of structural stability and tried it on test data.

scholarly journals Urban environment influence on distribution part of logistics systems

2017 ◽  
Vol 42 (2) ◽  
pp. 7-23 ◽  
Author(s):  
Andrii Galkin
Keyword(s):  
Net Present Value ◽  
Performance Indicator ◽  
Road Transport ◽  
Evolutionary Development ◽  
Material Flows ◽  
Logistics System ◽  
Logistics Systems ◽  
Transport Services ◽  
Transportation Service ◽  
The Impact

The irregularities of evolutionary development, continuous improvement of environmental component into transport and raise many unsolved problem in the fields of transport in logistics systems and material flows management. The city parameters analyses had highlighted connections with transport services technology. Also the distribution stage of the logistic chain, which consists of following market participants: incoming material flow, retailers and Transportation Company (carrier) in different cities has been considered. Transportation service is made by road transport. The paper compares results of transportation servicing in different cities and logistic chains with same technology. As performance indicator net present value has been used. Existing criteria for evaluating the effectiveness of distribution of material flows does not sufficiently take into account the time value of money and possible options for investment, so when estimating the performance of servicing of business investment indicators should be used. Paper should elucidate the impact of cities on the transport service efficacy. Practical suggestions on logistics system functioning and transportation service of retailers in urban area have been proposed. Obtained results discovered overall impact of city’s parameters (density of streets and roads network’ irregularity factor; automobilizationlevel; urban square; scheme of road network; city radius) on logistics according to model which include more than 50 parameters and allows finding regularities of changing logistics efficiency on them.

scholarly journals Methodological approaches to efficiency evaluation logistics system of pharmacy network

2020 ◽  
pp. 5-7
Author(s):  
Viktoriia VAVILOVA
Keyword(s):  
Environmental Factors ◽  
System Approach ◽  
Efficiency Evaluation ◽  
Effective Management ◽  
Dynamic Changes ◽  
Logistics System ◽  
Logistics Systems ◽  
Methodological Approaches ◽  
The Impact ◽  
Functional Components

The paper reveals the important characteristics of methodological approaches to assessing the effectiveness of logistics systems. Peculiarities of functioning of logistics systems of pharmacy networks are characterized. Based on the acquaintance with the scientific works of the founders on this issue, approaches to assessing the effectiveness of the logistics system are systematized. A system of evaluation indicators for each component of the logistics system is proposed. The logistics system of the business entity, and this fully applies to the logistics system of pharmacy networks, is not in a permanent state. Dynamic changes in the system are due to the influence of macro-environmental factors and changes in the internal nature, which pose the task of developing the system to ensure its adequacy to new conditions. It is the development of the system is the basis for improving the efficiency of its operation and the ability to achieve goals through the solution of a certain range of tasks. In such conditions, the study of the development of the logistics system of the pharmacy network deserves special attention. Existing approaches to assessing the development of the logistics system do not exclude, but complement each other, creating a methodological basis for the formation of effective management decisions on logistics management of the business entity. As a result of research of scientific works of domestic and foreign scientists on a problem of a choice and formation of indicators of an estimation of efficiency of logistic systems, we proposed a system of evaluation indicators for each component of the logistics system. In this case, in our opinion, such a system should include not only indicators that characterize the efficiency of the functional components of the logistics system of the pharmacy network (supply, production, transportation, warehousing, sales), but also indicators of efficiency subsystems, namely organizational and management, infrastructure and resource subsystems. This system approach will allow to take into account the impact of all components of the logistics system of the pharmacy network on the efficiency of its operation.

scholarly journals Application of seepage theory methods for solving the tasks of flow planning in transport networks with consideration of their structural dynamics

2021 ◽  
pp. 13-20
Author(s):  
Azret Ahmatovich Kochkarov ◽  
Danil Vladilenovich Yatskin ◽  
Rasul Ahmatovich Kochkarov
Keyword(s):  
Graph Model ◽  
Logistics System ◽  
Flow Models ◽  
Logistics Systems ◽  
System Building ◽  
Run Off ◽  
Global Transport ◽  
Seepage Theory ◽  
The Impact ◽  
And Task

This article reviews the theoretical-graph approach towards transport and logistic systems, which allows describing key details and processes that take place therein. The question of searching for an effective solution of transport and logistics tasks and dependence of such solutions to throughput of the system and the value of the seepage coefficient. This article offers to use seepage theory as an applied instrument for describing and solving transport and logistics tasks. The indicated approach is innovative and original, which may be very promising in the context of global transport planning and management. The essence of this method, based on adaptation of seepage theory for solution of the typical transport and logistics tasks, is reduced to operation of surface run-off and origin on the graph. The model for assessment of the global throughput of transport and logistics system is developed on the basis of the methods of seepage and multidrain flow models. The author offers a model calculation of the impact of holdups upon transport and logistics systems and the tasks solved thereof. A theoretical-graph model, which reflects the structure of transport and logistics system, describes the objects and processes common to transport and logistics tasks. The toolset of graph theory allows solving the specific transport and logistics tasks, as well examining the structural properties of the system, building predictive models, as well as developing new approaches towards solving of these tasks. The characteristics of graph are correlated with the actual network, system and task, as well as with the characteristics of transport or logistics flows examined for the purpose of optimization of topological structure of the system and solution of other tasks.

scholarly journals Digitalization as one of the directions of sustainable development of the integrated logistics system of the enterprise

2021 ◽  
Vol 291 ◽  
pp. 04012
Author(s):  
Zinaida Khmelnitskaya ◽  
Maria Ivich ◽  
Elena Bogdanova
Keyword(s):  
Sustainable Development ◽  
National Economy ◽  
Competitive Advantages ◽  
Logistics System ◽  
The Sustainable Development ◽  
Logistics Systems ◽  
Coronavirus Infection ◽  
Integrated Logistics ◽  
Constituent Elements ◽  
The Impact

Because of the pandemic of the new coronavirus infection, the pace of digitalization and its impact on all sectors of the national economy have increased. The integrated logistics systems of the enterprises have also undergone significant changes. The article examines the main trends of recent times — digitalization and integration, which provide development potential, competitive advantages for the enterprises using the integrated logistics systems. The authors investigated the impact of the new coronavirus infection on the changes in the logistics systems of the enterprise; identified eight main directions of the changes, one of which has become the acceleration of the digitalization along the entire chain of the integrated logistics systems. Further, the authors identified six characteristic constituent elements of the digitalization as one of the directions of the sustainable development. They examined the interaction between the functionalities of the integrated logistics system and the characteristic components of the digitalization.

scholarly journals The impact of marketing strategy on logistics decisions and the implementation of JIT

2021 ◽  
Author(s):  
Eszter Sós ◽  
Péter Földesi
Keyword(s):  
Marketing Strategy ◽  
Quality Function Deployment ◽  
Just In Time ◽  
Specific Product ◽  
Inventory Costs ◽  
Logistics Systems ◽  
Logistics Strategy ◽  
The Matrix ◽  
The Impact ◽  
Being Moved

Marketing has a significant impact on logistics systems and corporate performance, so it is nowadays necessary to define a marketing logistics strategy in the lives of larger companies so that logistics decisions are not distorted by the marketing strategy. According to the current direction of development, smaller and smaller quantities of goods are constantly being moved, with ever shorter deadlines. Therefore, companies prefer to use the Just In Time (JIT) system, which results in a gradual reduction in inventory costs, but increases the burden on the environment. In this article, we analyze the interaction between marketing and logistics and the logistics environment required to implement a JIT system. For research we have used the matrix of Quality Function Deployment (QFD) technique to evaluate the needs of the customer with respect to the JIT system, thus clarifying the logistics strategy applicable to the introduction of the specific product.

scholarly journals NTEGRATION OF LOGISTICS SYSTEMS OF DEVELOPING COUNTRIES INTO INTERNATIONAL LOGISTICS CHANNELS

2021 ◽  
Vol 8 (4) ◽  
pp. 329-340
Author(s):  
Hassan Ali Al- Ababneh ◽  
Ilona Dumanska ◽  
Ella Derkach ◽  
Anna Sokhetska ◽  
Liliia Kemarska
Keyword(s):  
Developing Countries ◽  
Statistical Analysis ◽  
Analytical Methods ◽  
International Standards ◽  
Economic Research ◽  
Economic Modelling ◽  
Logistics System ◽  
Structural Dynamic ◽  
Logistics Systems ◽  
The Impact

Modern logistics significantly influences the globalization and internationalization processes. Logistics systems are becoming increasingly important in today’s rapidly changing environment. The aim of the article was to investigate the national logistics systems of developing countries in the context of their integration capabilities. The main methods used in this study are statistical analysis, index, graphical and analytical methods, methods for estimating structural dynamic shifts, comparisons. Commonly used methods of economic research, as well as statistical analysis and interstate comparisons, economic modelling (trend analysis to determine the forecast level of LPI for Ukraine), etc. were also involved. The logistics environment of Poland, Bulgaria, India and Ukraine, as well as the factors of its formation are evaluated. The components of the logistic portrait of the country in the context of integration capabilities of the logistic system are offered. It was found for the studied countries that the destimulator of the national logistics system is infrastructure (for Poland), infrastructure and customs (for Bulgaria and Ukraine), customs (for India). It is these components that need priority attention in the context of increasing the integration capabilities of logistics systems, because the results indicate that they lag far behind international standards. Prospects for further research involve studies of the impact of pandemics, globalization, digitalization on logistics systems, including that of developing countries.

Impact Strength, Flexural Modulus and Wear Rate of PMMA Composites Reinforced by Eggshell Powders

2020 ◽  
Vol 38 (7A) ◽  
pp. 960-966
Author(s):  
Aseel M. Abdullah ◽  
Hussein Jaber ◽  
Hanaa A. Al-Kaisy
Keyword(s):  
Impact Strength ◽  
Wear Rate ◽  
Flexural Modulus ◽  
Matrix Material ◽  
Weight Fraction ◽  
Pure Pmma ◽  
Calcination Process ◽  
The Matrix ◽  
The Impact ◽  
Interface Bond

In the present study, the impact strength, flexural modulus, and wear rate of poly methyl methacrylate (PMMA) with eggshell powder (ESP) composites have been investigated. The PMMA used as a matrix material reinforced with ESP at two different states (including untreated eggshell powder (UTESP) and treated eggshell powder (TESP)). Both UTESP and TESP were mixed with PMMA at different weight fractions ranged from (1-5) wt.%. The results revealed that the mechanical properties of the PMMA/ESP composites were enhanced steadily with increasing eggshell contents. The samples with 5 wt.% of UTESP and TESP additions give the maximum values of impact strength, about twice the value of the pure PMMA sample. The calcination process of eggshells powders gives better properties of the PMMA samples compared with the UTESP at the same weight fraction due to improvements in the interface bond between the matrix and particles. The wear characteristics of the PMMA composites decrease by about 57% with increases the weight fraction of TESP up to 5 wt.%. The flexural modulus values are slightly enhanced by increasing of the ESP contents in the PMMA composites.

scholarly journals The Interactions between Polyphenols and Microorganisms, Especially Gut Microbiota

Antioxidants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 188
Author(s):  
Małgorzata Makarewicz ◽  
Iwona Drożdż ◽  
Tomasz Tarko ◽  
Aleksandra Duda-Chodak
Keyword(s):  
Intestinal Bacteria ◽  
Research Data ◽  
Bioactive Metabolites ◽  
Human Organism ◽  
Comprehensive Knowledge ◽  
Bidirectional Relationship ◽  
The Matrix ◽  
Intestinal Pathogens ◽  
The Impact

This review presents the comprehensive knowledge about the bidirectional relationship between polyphenols and the gut microbiome. The first part is related to polyphenols’ impacts on various microorganisms, especially bacteria, and their influence on intestinal pathogens. The research data on the mechanisms of polyphenol action were collected together and organized. The impact of various polyphenols groups on intestinal bacteria both on the whole “microbiota” and on particular species, including probiotics, are presented. Moreover, the impact of polyphenols present in food (bound to the matrix) was compared with the purified polyphenols (such as in dietary supplements) as well as polyphenols in the form of derivatives (such as glycosides) with those in the form of aglycones. The second part of the paper discusses in detail the mechanisms (pathways) and the role of bacterial biotransformation of the most important groups of polyphenols, including the production of bioactive metabolites with a significant impact on the human organism (both positive and negative).

scholarly journals Reliability Assessment of a Multi-State HVDC System by Combining Markov and Matrix-Based Methods

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3097
Author(s):  
Roberto Benato ◽  
Antonio Chiarelli ◽  
Sebastian Dambone Sessa
Keyword(s):  
Current System ◽  
Estimation Method ◽  
Reliability Estimation ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Hvdc System ◽  
Critical Elements ◽  
The Matrix ◽  
The Impact

The purpose of this paper is to highlight that, in order to assess the availability of different HVDC cable transmission systems, a more detailed characterization of the cable management significantly affects the availability estimation since the cable represents one of the most critical elements of such systems. The analyzed case study consists of a multi-terminal direct current system based on both line commutated converter and voltage source converter technologies in different configurations, whose availability is computed for different transmitted power capacities. For these analyses, the matrix-based reliability estimation method is exploited together with the Monte Carlo approach and the Markov state space one. This paper shows how reliability analysis requires a deep knowledge of the real installation conditions. The impact of these conditions on the reliability evaluation and the involved benefits are also presented.

scholarly journals Evaluating the role of contracting and expanding rainforest in initiating cycles of speciation across the Isthmus of Panama

2012 ◽  
Vol 279 (1742) ◽  
pp. 3520-3526 ◽  
Author(s):  
Brian Tilston Smith ◽  
Amei Amei ◽  
John Klicka
Keyword(s):  
Bird Species ◽  
Tropical Regions ◽  
Isthmus Of Panama ◽  
Species Pairs ◽  
The Matrix ◽  
High Species Richness ◽  
The Rich ◽  
The Tropics ◽  
The Impact

Climatic and geological changes across time are presumed to have shaped the rich biodiversity of tropical regions. However, the impact climatic drying and subsequent tropical rainforest contraction had on speciation has been controversial because of inconsistent palaeoecological and genetic data. Despite the strong interest in examining the role of climatic change on speciation in the Neotropics there has been few comparative studies, particularly, those that include non-rainforest taxa. We used bird species that inhabit humid or dry habitats that dispersed across the Panamanian Isthmus to characterize temporal and spatial patterns of speciation across this barrier. Here, we show that these two assemblages of birds exhibit temporally different speciation time patterns that supports multiple cycles of speciation. Evidence for these cycles is further corroborated by the finding that both assemblages consist of ‘young’ and ‘old’ species, despite dry habitat species pairs being geographically more distant than pairs of humid habitat species. The matrix of humid and dry habitats in the tropics not only allows for the maintenance of high species richness, but additionally this study suggests that these environments may have promoted speciation. We conclude that differentially expanding and contracting distributions of dry and humid habitats was probably an important contributor to speciation in the tropics.

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