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Symulacyjne badania wpływu mechanizmu priorytetyzacji ruchu na efektywność ruchową wielousługowych węzłów sieciowych

Nowak Błażej, Zwierzykowski Piotr

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2022

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nr 4

210--214

PL

Artykuł poświęcony jest badaniom wpływu mechanizmu priorytetyzacji ruchu na efektywność ruchową wielousługowych węzłów sieciowych. Przedstawiono w nim również najważniejsze algorytmy oraz mechanizmy wykorzystane do tworzenia środowiska symulacyjnego zastosowanego w badaniach. Artykuł zawiera wyniki badań które ukazują możliwości oceny wpływu mechanizmu priorytetyzacji ruchu na efektywności ruchową węzła sieciowego.

2

How to Select a Location and a Design of Measures on Land Drainage – A Case Study from the Czech Republic

Zajíček Antonín, Hejduk Tomáš, Sychra Libor, Vybíral Tomáš, Fučík Petr

Journal of Ecological Engineering

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2022

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Vol. 23, nr 4

43--57

EN

A new approach for sites prioritization and designing measures on land drainage was developed and tested on the 96.5 km2 Žejbro catchment (Czech Republic). The aim was to design an effective, mutually interconnected system of measures, on tiles, manholes, outlets as well as on ditches (s.c. main drainage facilities, MDF) that will increase water retention and storage in intensively farmed and tile-drained catchments and will reduce water pollution from subsurface non-point sources (drainage runoff). This approach consists of (I) selecting suitable sites using the Catchment Measures Need Index (CAMNI) method; (II) obtaining information on land drainage in the area of interest; (III) conducting a field survey and water quality monitoring; (IV) designing appropriate systems of measures; and (V) analysing the estimated costs of the proposed measures. Measures were proposed for fourteen sub-catchments that were selected based on the results of a CAMNI analysis and whether an MDF or a heavily modified stream is present. A total of 44 point measures, 62 areal measures, and 99 line measures were proposed. Implementation of these measures would reduce the load of N-NO3, a major pollutant from drainage runoff, by 44 tons per year (48%). From the financial point of view, these measures are not self-financing and the benefits do not cover the expected costs of their implementation and maintenance. However, these measures have a profound ecological and societal benefits which, when taken into account, make these measures suitable for implementation when (co-)financed from public budgets. Putting the presented approach into practice, for example, in the framework of complex land consolidations or by watershed management authorities, could significantly improve the condition and water regime of intensively drained agricultural landscapes.

3

Bayesian graphical model based optimal decision-making for fault diagnosis of critical induction motors in industrial applications

Lakehal A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2020

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Vol. 68, nr 3

467--476

EN

In an effort to achieve an optimal availability time of induction motors via fault probabilities reduction and improved prediction or diagnostic tools responsiveness, a conditional probabilistic approach was used. So, a Bayesian network (BN) has been developed in this paper. The objective will be to prioritize predictive and corrective maintenance actions based on the definition of the most probable fault elements and to see how they serve as a foundation for the decision framework. We have explored the causes of faults for an induction motor. The influence of different power ranges and the criticality of the electric induction motor are also discussed. With regard to the problem of induction motor faults monitoring and diagnostics, each technique developed in the literature concerns one or two faults. The model developed, through its unique structure, is valid for all faults and all situations. Application of the proposed approach to some machines shows promising results on the practical side. The model developed uses factual information (causes and effects) that is easy to identify, since it is best known to the operator. After that comes an investigation into the causal links and the definition of the a priori probabilities. The presented application of Bayesian networks is the first of its kind to predict faults of induction motors. Following the results of the inference obtained, prioritizations of the actions can be carried out.

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Development and application of a decision making tool for fault diagnosis of turbocompressor based on Bayesian network and fault tree

Lakehal Abdelaziz, Nahal Mourad, Harouz Riad

Management and Production Engineering Review

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2019

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Vol. 10, No. 2

16–-24

EN

Fault Tree is one of the traditional and conventional approaches used in fault diagnosis. By identifying combinations of faults in a logical framework it’s possible to define the structure of the fault tree. The same go with Bayesian networks, but the difference of these probabilistic tools is in their ability to reasoning under uncertainty. Some typical constraints to the fault diagnosis have been eliminated by the conversion to a Bayesian network. This paper shows that information processing has become simple and easy through the use of Bayesian networks. The study presented showed that updating knowledge and exploiting new knowledge does not complicate calculations. The contribution is the structural approach of faults diagnosis of turbo compressor qualitatively and quantitatively, the most likely faults are defined in descending order. The approach presented in this paper has been successfully applied to turbo compressor, which represent vital equipment in petrochemical plant.

5

LTE /LTE -A to TETRA selected features comparative assessment in the area of call prioritization, pre-emption and admission control for congested network scenarios

Wojtowicz T.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2018

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nr 10

856--863

EN

Development can be observed in mission-critical public safety communication systems, where narrowband LMR (LandMobile Radio) technologies are getting augmented with broadband (LTE ) based solutions. There are at least several such projects around the world currently getting implemented, with many more expected to start in the next few years. With all the advanced features that broadband is enabling for PPDR (Public Protection, Disaster Recovery) users, it needs to be ensured, that it brings the parity with existing LMR technologies in the area of prioritisation, preemption and quality of service, especially in network congestion scenarios. In this paper we are providing a qualitative analysis of these areas, comparing proven LMR technology – Tetra, with 3GPP driven LTE , including latest mission-critical additions to the standard. In scenarios where PPDR users are sharing the network with commercial users, LTE introduces several challenges typically not present in LMR systems deployed so far. We outline this point and discuss possible system level solution and architecture proposal.

PL

Obecnie można zaobserwować tendencję do rozszerzania krytycznych systemów telekomunikacyjnych dla bezpieczeństwa publicznego, działających w standardach o wąskiej przepustowości (Landmobile Radio – LMR), o rozwiązania szerokopasmowe (LTE ). Rozpoczęto wdrożenie przynajmniej kilku takich projektów na świecie, a wiele kolejnych oczekuje się w ciągu najbliższych kilku lat. Przy wszystkich zaawansowanych funkcjach, jakie zapewnia LTE dla użytkowników krytycznych, istotne jest zapewnienie poziomu usług, odpowiadającego sprawdzonym, istniejącym technologiom LMR, w takich obszarach, jak priorytetyzacja, wywłaszczanie czy kontrola jakości, zwłaszcza w sytuacjach, gdy sieć jest przeciążona. W artykule przedstawiono analizę jakościową, porównując dojrzałą i sprawdzoną technikę opartą na standardzie TETRA ze standardem 3GPP LTE , wraz z najnowszymi rozszerzeniami pod względem bezpieczeństwa publicznego. W modelach wdrożenia, w których użytkownicy krytyczni współdzielą sieć z użytkownikami komercyjnymi, w sieciach LTE pojawia się kilka technicznych wyzwań niespotykanych dotychczas w prywatnych, dedykowanych i zamkniętych sieciach LMR. Przedstawiono te problemy i zaproponowano również architekturę systemu wspomagającą ich rozwiązanie.

6

Prioritization of barriers to lean implementation in Indian automotive small & medium sized enterprises

Tiwari R. K., Tiwari J. K.

Management and Production Engineering Review

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2018

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Vol. 9, No. 2

69--79

EN

Lean manufacturing has been the most deliberated concept ever since its introduction. Many organization across the world implemented lean concept and witnessed dramatic improvements in all contemporary performance parameters. Lean manufacturing has been a sort of mirage for the Indian automotive industry. The present research investigated the key lean barriers to lean implementation through literature survey, confirmatory factor analysis, multiple regression, and analytic network process. The general factors to lean implementation were inadequate lean planning, resource constraints, half-hearted commitment from management, and behavioral issues. The most important factor in the context of lean implementation in Indian automotive industry was inadequate lean planning found with the help of confirmatory factor analysis and multiple regression analysis. Further analysis of these extracted factors through analytic network process suggested the key lean barriers in Indian automotive industry, starting from the most important were absence of proper lean implementation methodology, lack of customer focus, absence of proper lean measurement system, inadequate capital, improper selection of lean tools & practices, leadership issues, resistance to change, and poorly defined roles & responsibilities. Though literature identifying various lean barriers are available. The novelty of current research emerges from the identification and subsequent prioritization of key lean barriers within Indian automotive SMEs environment. The research assists in smooth transition from traditional to lean system by identifying key barriers and developing customized framework of lean implementation for Indian automotive SMEs.

7

Inteligentne priorytetowanie transportu publicznego na drogach wyższych kategorii

Molecki A.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 4

7--9

PL

Zastosowanie urządzeń z zakresu Inteligentnych Systemów Transportowych (ITS) na drogach zamiejskich wciąż jest niewielkie. W zakresie sygnalizacji świetlnej nadal szczytem technologii wydaje się być prosta akomodacja. Sytuacja ta będzie się w najbliższym czasie zmieniać. Warto w tym przypadku zwrócić uwagę na to, iż dynamicznie rozwijające się systemy inteligentnego priorytetowania transportu zbiorowego nie muszą dotyczyć jedynie miast.

EN

Intelligent Transport Systems tools and equipment are built still not very often out of cities. It seems, that simple accommodation on traffic lights is the higher level of ITS there. This situation will evolve in the near future. What is important, dynamic developing of intelligent priority systems does not have to be limited only to cities or urban areas.

8

Ageing PSA as a support for effective ageing management

Berg H. P., Volkanovski A.

Journal of Polish Safety and Reliability Association

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2014

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Vol. 5, No. 2

1--10

EN

Because of the growing operational age of nuclear power plants, the ageing management of structures, systems and components used in these plants is gaining an important role. Technical systems are subject to timedependent and operationally caused ageing phenomena with modifications of originally given characteristics and, thus, of relevance in terms of safety. Especially physical ageing is of importance. Therefore, a comprehensive ageing management is required. In the context of an integrated safety management it has to be shown how to integrate the safety related issues of ageing into probabilistic safety assessment (PSA). In particular the question is to be answered whether the effort for the execution of an ageing PSA is justified, in particular if the safety significant effects of ageing can be identified and quantitatively estimated. Method for prioritization of the components in the nuclear power plant considering implication of their ageing on safety of the nuclear power plant is presented. On the basis of an actual report on ageing management in German nuclear power plants and a literature survey, this paper tries to estimate the necessity and value for the introduction of an ageing PSA in Germany.