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Tytuł:
Fuzzy approach to dimensioning the navigational safety in maritime transport
Autorzy:
Smolarek, L.
Powiązania:
https://bibliotekanauki.pl/articles/245023.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
safety dimensioning
stochastic fuzzy models
safety in sea transport
Opis:
The safety of ships involved in the process of transport is one of the most important criteria in the maritime transport. Important factors making up the safety include the technical efficiency of the ship, the qualifications of the people in charge of the ship and the conditions under which the transport process takes a place. The paper focuses on the problems significant and characteristic to the ship traffic safety under uncertainty conditions. The ship safety at supervised traffic requires continuous identification of the navigational situation. Very often safety assessment of the traffic situation is made by examining the relative positions of vessel’s domains. A limitation is that under uncertainty conditions and more than two vessels we have to take into consideration dynamic domains according to the situations of conflicts, which is rather difficult to analyse. One way to assess the traffic safety approximation is analysis of the potentially conflicting situation. Safety in maritime transport can be analysed at the micro level (safety of the ship, the safety of navigation in specific situation mobility) and in terms of macro models (evaluation over time).In the article some problems of fuzzy description of traffic safety in maritime transport are presented. Basic definitions and a stochastic approach to concept of traffic safety in transport are given. The fuzzy approach to stochastic method of dimensioning traffic safety, useful in dynamic traffic control, is proposed.
Źródło:
Journal of KONES; 2014, 21, 4; 453-459
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensioning aspects of SMS systems in mobile networks
Autorzy:
Klink, J.
Uhl, T.
Powiązania:
https://bibliotekanauki.pl/articles/134973.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
SMS
QoS
Quality of Experience (QoE)
text messaging
queueing system
dimensioning
Opis:
This paper focuses on factors affecting the dimensioning of Short Message Service (SMS) systems in mobile communications networks. Problems associated with Quality of Service (QoS) in modern communications networks in general are described, along with the main parameters that define QoS in SMS systems. The functionality of the SMS in terms of European Telecommunications Standards Institute (ETSI) standards is then explained. The creation of a queuing model is described for an SMS system which is based on ETSI documentation and will be analysed in calculations. The parameter completion rate plays an important role in SMS. Practical aspects of the End-to-End (E2E) delivery time for SMS systems are also discussed. The approach suggested in this paper and the insights gained in the course of this work can be of valuable practical use in the planning and analysis of real SMS systems.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 110-118
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fair resource allocation schemes and network dimensioning problems
Autorzy:
Ogryczak, W.
Śliwiński, T.
Wierzbicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/307704.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
sieci telekomunikacyjne
telecommunication networks
network dimensioning
resource allocation
fairness
Opis:
Resource allocation problems are concerned with the allocation of limited resources among competing activities so as to achieve the best overall performances of the system but providing fair treatment of all the competitors. Telecommunication networks are facing the increasing demand for Internet services. Therefore, a problem of network dimensioning with elastic traffic arises which requires to allocate bandwidth to maximize service flows with fair treatment of all the services. In such applications, the so-called max-min fairness (MMF) solution concept is widely used to formulate the resource allocation scheme. This guarantees the fairness but may lead to significant losses in the overall throughput of the network. In this paper we show how multiple criteria optimization concepts can be used to generate various fair resource allocation schemes. The solution concepts are tested on the network dimensioning problem and their abilities to model various preferences are demonstrated.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 3; 34-42
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Network Dimensioning with Maximum Revenue Efficiency for the Fairness Index
Autorzy:
Zalewski, G.
Ogryczak, W.
Powiązania:
https://bibliotekanauki.pl/articles/307749.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
allocation problem
decision problems
dimensioning networks
fair-optimization
linear programming
maximization
multi-criteria
Opis:
Network dimensioning is a specific kind of the resource allocation problem. One of the tasks in the network optimization is to maximize the total flow on given pairs of nodes (so-called demands or paths between source and target). The task can be more complicated when different revenue/profit gained from each unit of traffic stream allocated on each demand is taken into account. When the total revenue is maximized the problem of starvation of less attractive paths can appear. Therefore, it is important to include some fairness criteria to preserve connections between all the demands on a given degree of quality, also for the least attractive paths. In this paper, a new bicriteria ratio optimization method which takes into account both, the revenue and the fairness is proposed. Mathematical model is built in a form of linear programming. The solutions are analyzed with some statistical measures to evaluate their quality, with respect to fairness and efficiency. In particular, the Gini’s coefficient is used for this purpose.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 4; 15-21
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Dimensioning and Routing in the IP QoS System
Autorzy:
Góralski, W.
Pyda, P.
Dalecki, T.
Mongay Batalla, J.
Śliwiński, J.
Latoszek, W.
Gut, H.
Powiązania:
https://bibliotekanauki.pl/articles/307866.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
IP QoS System
resource dimensioning
routing
Opis:
This article presents dimensioning and routing solutions in IP QoS System designed during the implementation of the PBZ project: "Next Generation Services and Networks - technical, application and market aspects: Traffic management - IP QoS System". The paper presents the functional architecture together to the description of the functions and methods implemented in the system.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 21-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensioning and tolerancing of coated parts
Оpredelenie razmerov i dopuskov detalejj s pokrytijami
Autorzy:
Kharlamov, Y.
Al-Jawaheri, A.A.M.
Powiązania:
https://bibliotekanauki.pl/articles/792933.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
dimensional tolerance
coated part
manufacturing operation
technological process
coating
geometric dimensioning
manufacturing technology
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensioning of port waterways for vessels handling offshore wind farms using the navigational risk analysis
Autorzy:
Gucma, Stanisław
Gralak, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/24202516.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
offshore wind farm
offshore wind turbine
offshore wind turbine installation terminal
wind turbine installation vessel
wind turbine transport vessel
dimensioning of waterways
Opis:
This article indicates the development trends in the construction of offshore wind turbines worldwide, and the characteristics of existing and planned ships for wind turbine installation and maintenance; it presents an approach to design ports with their future operations in mind. Problem: The safety of navigation in port waterways is the basic restrictions for the construction of harbors (terminals) to handle ships used for the construction of OWT and for increasing their size. Navigational risk is a criterion of navigational safety assessment that allows its accurate estimation in port waterways. Method: The article presents the method for dimensioning port waterways for ships serving offshore sea wind turbine transport and construction. Furthermore, a method for determining the navigational risk of jack-up vessels navigating in port waterway areas is presented. Results: The authors have determined conditions for safe operation of these ships in restricted areas and defined the basic condition of navigational safety. The presented method of navigational risk analysis refers to the departure of a loaded ship carrying offshore wind turbine components in the presently designed port terminal in Świnoujście for handling offshore wind farm projects. Conclusion: These are universal methods that can be applied to the design of ports serving vessels that install offshore wind turbines in various types of waters.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 70 (142); 9--19
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensioning the approach to the Liquefied Natural Gas terminal in Świnoujście using analytical and simulation methods
Autorzy:
Anczykowska, A.
Ślączka, W.
Powiązania:
https://bibliotekanauki.pl/articles/906044.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
method of Three Components
Panama Canal Method
Canadian Method
method of INM
PIANC method
simulation method
dimensioning of fairways
LNG
LNG terminal in Świnoujście
Opis:
This article presents a comparison between the use of analytical methods and simulations for dimensioning the approach to the liquefied natural gas (LNG) terminal in Świnoujście. Parameters of rectilinear sections of the fairway were obtained by analytical methods, widely used in traffic engineering. These methods are: the method of the Three Components, the Panama Canal method, the Canadian method, the method of the INM and the PIANC method. Dimensioning the approaching fairway to the LNG terminal in Świnoujście was conducted for two types of LNG tankers: Q-flex and Q-max. Results for simulation methods were obtained using a navigational bridge simulator. Results obtained using analytical and simulation methods allowed the comparison of parameters of the approach to the LND terminal in Świnoujście, and an indication of the optimal dimensioning methods of a fairway’s straight sections.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 101-107
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio network planning of GSM-R in polish railways standards
Autorzy:
Siergiejczyk, M.
Włodarczyk, D.
Powiązania:
https://bibliotekanauki.pl/articles/393926.pdf
Data publikacji:
2014
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
system
GSM-R
planning
dimensioning
planowanie
wymiarowanie
Opis:
The article presents some problems for the radio network planning rail system digital mobile GSM-R. There is a description of the architecture of the system, a set of available services and the different ways of data transmission. Then there are presented certain conditions that should be taken into account for the link and the requirements for network dimensioning for the purpose of determining the physical capacity of the network. Volume generated within the base station telecom traffic affects not only the number needed to handle the movement of resources, but also implies a number needed to allocate frequency channels.
Źródło:
Archives of Transport System Telematics; 2014, 7, 3; 42-46
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical analysis and dimensioning of a wind farm energy storage system
Autorzy:
Waśkowicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/141698.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy storage
power quality
renewable energy
wind power
Opis:
The growth in renewable power generation and more strict local regulations regarding power quality indices will make it necessary to use energy storage systems with renewable power plants in the near future. The capacity of storage systems can be determined using different methods most of which can be divided into either deterministic or stochastic. Deterministic methods are often complicated with numerous parameters and complex models for long term prediction often incorporating meteorological data. Stochastic methods use statistics for ESS (Energy Storage System) sizing, which is somewhat intuitive for dealing with the random element of wind speed variation. The proposed method in this paper performs stabilization of output power at one minute intervals to reduce the negative influence of the wind farm on the power grid in order to meet local regulations. This paper shows the process of sizing the ESS for two selected wind farms, based on their levels of variation in generated power and also, for each, how the negative influences on the power grid in the form of voltage variation and a shortterm flicker factor are decreased.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 265-277
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Model for Optimum Warehouse Dimensions
Autorzy:
Karakis, I.
Baskak, M.
Tanyaş, M.
Powiązania:
https://bibliotekanauki.pl/articles/409344.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
facilities planning and design
warehouse dimensioning
nonlinear programming
convex programming
supply chain management
Opis:
Warehouses are essential components of any supply chain in terms of customer service and cost levels. Warehouses are one of the important players in the success or failure of businesses from not only the customer service levels perspective but also the cost perspective. Warehouses, as one of the important components of supply networks, should be continually improved from design and operation perspectives to increase the performance. All efforts and solutions regarding the performance improvement are important and complex. In other words, warehouses should operate effectively in terms of the costs and technical performance that are determined during the design phase of warehouses. There are a few studies in the literature regarding the calculations of the optimum dimensions of a warehouse along the x, y, and z directions. In this paper, an analytical model is proposed to achieve the optimum warehouse dimensions in terms of the number of stocking zones along each of three dimensional axes directions: the x-, y-, and z-axes as non-linear mathematical modelling is developed to ensure the optimality. The warehouse dimensions (length, width, and height under the rafter of the building) are then calculated according to the results obtained from the model to minimise the average travel time.
Źródło:
Research in Logistics & Production; 2015, 5, 3; 255-269
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dimensioning and performance analysis of an axial hydraulic turbine of high power/weight ratio
Autorzy:
Kenyery, F.
Rey, R.
Noguera, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931594.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
hydraulics
axial flow turbine performance
cavitation
Opis:
The purpose of this research is to develop a methodology for dimensioning and performance analysis of a stage of Hydraulic Axial-Flow Turbines of High Power to Weight Ratio (HAFT-HPWR). The HAFT-HPWR consists of two rows (stator and rotor) with non-twisted blades. The axial flow turbine of higher power to weight ratio is that with adegree of reaction equal to zero. The experimental results on a single stage 50\% reaction turbine show a big influence of Reynolds number on the turbine performance. The zone of operation at the best efficiency point varies strongly with the rotation speed. The performance analysis of HAFT-HPWR requires the precise assessment of the influence of the Reynolds number on deflection and the hydraulic losses. Due to complexity of the flow in an axial turbine, such assessment should be based on 3D numerical simulation, in order to compute the hydraulic losses present in a stage of HAFT-HPWR, without using models and correlations.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 609-620
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Path Diversity Protection in Two-Layer Networks
Autorzy:
Dzida, M.
Śliwiński, T.
Zagożdżon, M.
Ogryczak, W.
Pióro, M.
Powiązania:
https://bibliotekanauki.pl/articles/308914.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
link dimensioning
path diversity
resilient routing
two-layer network optimization
Opis:
The paper addresses an optimization problem related to dimensioning links in a resilient two-layer network. A particular version of the problem which assumes that links of the upper layer are supported by unique paths in the lower layer is considered. Two mixed-integer programming formulations of this problem are presented and discussed. Direct resolving of these formulations requirespre-selection of "good" candidate paths in the upper layer of the network. Thus, the paper presents an alternative approach which is based on decomposing the resolution process into two phases, resolved iteratively. The first phase subproblem is related to designing lower layer path flows that provide the capacities for the logical links of the upper layer. The second phase is related to designing the flow patterns in the upper layer with protection assured through diversity of paths. In this phase we take into account the failures of the logical links that result from the failures of the lower layer links (so called shared risk link groups).
Źródło:
Journal of Telecommunications and Information Technology; 2009, 3; 14-19
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The concept of surveying set for geometrical dimensioning of difficultly accessible objects
Koncepcja przyrządu pomiarowego do wymiarowania obiektów trudno dostępnych
Autorzy:
Ćmielewski, Kazimierz
Karsznia, Krzysztof
Gołuch, Piotr
Kuchmister, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2203441.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
While constructing and documenting civil structures, large machines, and industrial facilities, one can encounter a situation where relevant control points are hardly accessible. The instruments with appropriate surveying equipment available on the market provide relatively standard measurements. The limitations mentioned above may transfer into an increased working time (or financial effort) that must be considered while performing the prescribed measuring works. One of the possible solutions (assuming financial capabilities) is utilizing a video-total station (a scan station) with additional supporting equipment. Another possibility would be employing a terrestrial laser scanner (TLS) or close-range photogrammetry. However, such technologies demonstrate significant limitations, especially in the industrial environment. Regarding that, the authors propose an original measuring set collaborating with a free electronic total station. The main working principle is a known surveying 3D-polar method that can determine XYZ coordinates. The solution presented in the paper facilitates the performance of inventory works, consisting of dimensioning civil structures and rooms with difficult access. Such situations can often be encountered in industrial plants or while documenting architectural or other engineering structures. The device can also be used for dimensioning ventilation ducts, elevator shafts, and other similar facilities. Depending on the configuration of the measuring equipment and the target shapes, the final accuracy may reach a sub-millimeter or millimeter level. Hence, the solution can successfully be applied in civil engineering, industrial surveying, and industrial metrology.
Podczas prac realizacyjnych, a następnie inwentaryzacji obiektów budowlanych, dużych maszyn i urządzeń napotkać można sytuacje, w których występuje ograniczona dostępność do punktów pomiarowych. Oferowane na rynku instrumenty i oprzyrządowanie umożliwiają zwykle prowadzenie pomiarów standardowych. Uzupełnieniem zasygnalizowanych rozwiązań jest opisany w niniejszej pracy oryginalny zestaw współdziałający z dowolnym tachimetrem elektronicznym. Istotą pomiaru jest znana w geodezji metoda pomiaru biegunowego 3D pozwalająca wyznaczyć współrzędne XYZ punktów kontrolowanych. Przedstawione w artykule rozwiązania usprawniają wykonanie prac inwentaryzacyjnych polegających na wymiarowaniu elementów geometrycznych oraz pomieszczeń, do których dostęp jest utrudniony. Z sytuacją taką można się spotkać najczęściej w zakładach przemysłowych, a także podczas prowadzenia prac inwentaryzacyjnych obiektów architektonicznych lub inżynierskich. Opracowany zestaw można z powodzeniem wykorzystać także do wymiarowania przewodów wentylacyjnych, szybów windowych oraz innych podobnych instalacji. W zależności od konfiguracji wykorzystanego sprzętu pomiarowego oraz długości celowych, osiągnąć można dokładność wyznaczenia punktów pomiarowych na poziomie submilimetrowym lub milimetrowym.
Źródło:
Archives of Civil Engineering; 2023, 69, 1; 627--644
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the system with vacations under poissonian input stream and constant service times
Autorzy:
Sosnowski, M.
Burakowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/309584.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
approximation analysis
buffer dimensioning
mean waiting times
system with vacations
Opis:
In the paper approximate formulas for the mean waiting times and the buffer dimensioning in the system with vacations fed by the stream of Poissonian type with constant service times is shown. Furthermore, in the considered system the time intervals of the availability/notavailability of the service are constant and are run alternately according to the assumed cycle. More precisely, presented approach begin with derivation of the mean waiting times and, on the basis of this, the required buffer size for guaranteeing the losses less than predefined value is estimated. The accuracy of the presented analytical formulas is on a satisfactory level. The formulas were used for the System IIP dimensioning.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 3; 3-8
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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