Wszystkie pola: overload control - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Statistical analysis and modeling of SIP traffic for parameter estimation of server hysteretic overload control
Autorzy:: Abaev, P.
Razumchik, R.
Uglov, I.
Powiązania:: https://bibliotekanauki.pl/articles/308261.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Markov Modulated Poisson Process
overload control
SIP server
statistical analysis
Opis:: The problem of overload control in Session Initiation Protocol (SIP) signaling networks gives rise to many questions which attract researchers from theoretical and practical point of view. Any mechanism that is claimed to settle this problem down demands estimation of local (control) parameters on which its performance is greatly dependent. In hysteretic mechanism these parameters are those which define hysteretic loops. In order to find appropriate values for parameters one needs adequate model of SIP traffic flow circulating in the network under consideration. In this paper the attempt is made to address this issue. Analysis of SIP traffic collected from telecommunication operator’s network is presented. Traffic profile is built. It is shown that fitting with Markov Modulated Poisson Process with more than 2 phases is accurate. Estimated values of its parameters are given.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 4; 22-31
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of an M|G|1|R queue with batch arrivals and two hysteretic overload control policies
Autorzy:: Gaidamaka, Y.
Pechinkin, A.
Razumchik, R.
Samouylov, K.
Sopin, E.
Powiązania:: https://bibliotekanauki.pl/articles/330114.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: queueing system
batch arrival
general service time
overload
hysteretic load control
system kolejkowy
czas obsługi
przeciążenie
Opis:: Hysteretic control of arrivals is one of the most easy-to-implement and effective solutions of overload problems occurring in SIP-servers. A mathematical model of an SIP server based on the queueing system [...] with batch arrivals and two hysteretic loops is being analyzed. This paper proposes two analytical methods for studying performance characteristics related to the number of customers in the system. Two control policies defined by instants when it is decided to change the system’s mode are considered. The expression for an important performance characteristic of each policy (the mean time between changes in the system mode) is presented. Numerical examples that allow comparison of the efficiency of both policies are given.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 519-534
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Load analysis of propulsion engine during ships speed acceleratio
Autorzy:: Rosłanowski, J.
Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/246664.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: load propulsion engine
ship's speed acceleration
control engine operation
running non-overload engine
Opis:: The following paper presents load analysis of propulsion engine during ship's speed acceleration. This process is carried out after manoeuvring in order to receive, as fast as possible, exploitation speeds of the ship, achieved during the voyage. The analysis concerns direct propulsion power system of low-speed engine of constant pitch propeller. Wrong steering process of engine load changes in temporary states, can cause engine overloading, as the result of its operation on the external limiting characteristic and can end up in engine seizure. Control of engine operation is carried on through selecting of adequate setting of rotational speed governor, which for specified external conditions can result in adequate position of fuel link and the choice of adequate fuel index arm dose. Equalization of the power delivered by the engine in given conditions of work with power required by the ship’s propeller cooperating with the hull, will establish adequate rotational speed of the engine and finally the speed of the vessel. In order to speed up the sip's motion, there must occur an overflow of propeller thrust over the required thrust (resistance) and this, in turn, is connected with the necessity to ensure the engine power surplus over the power required for a given range of operation or in other words sailing speed. This article presents the working model of ship propelling system during speed acceleration and concerns mainly nonoverload running of the engine. The model described above has been verified during tests in real conditions at sea.
Źródło:: Journal of KONES; 2012, 19, 2; 443-448
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Winding machine additional overload state indication as supporting solution for mine shaft hoist operators
Autorzy:: Siostrzonek, Tomasz
Trójca, Piotr
Wójcik, Jakub
Powiązania:: https://bibliotekanauki.pl/articles/111362.pdf
Data publikacji:: 2019
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: mining shaft hoist
logger
winding machine control system
Opis:: Dangerous events that take place in the mining plant always give us a chance to rethink whether the design of a faulty device could have been improved enough to prevent such a situation. The same scenario takes place with mining shaft hoist. Withouta doubt, a starting point for discussions about additional mining shaft hoist security measures is the last dangerous situation that took place in a Silesian mine in 2017. This article is an analysis of the probable causes and conclusions that can be drawn from that incident.
Źródło:: Mining – Informatics, Automation and Electrical Engineering; 2019, 57, 1; 40-43
2450-7326
2449-6421
Pojawia się w:: Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Trening kontroli motorycznej w niskim obciążeniu u kobiet z przewlekłym bólem kręgosłupa lędźwiowego o charakterze zwyrodnieniowym i przeciążeniowym
Low-load motor control training in women with chronic degenerative and overload pain in the Lumbar spine
Autorzy:: Ulikowski, Michał
Wojciechowski, Jarosław
Leszczyński, Ryszard
Lewandowski, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/424084.pdf
Data publikacji:: 2018
Wydawca:: Lubuskie Towarzystwo Naukowe
Tematy:: lower back pain
core stability
motor control
sanatorium treatment
ból dolnego odcinka kręgosłupa
stabilizacja centralna
kontrola motoryczna
leczenie sanatoryjne
Opis:: The aim of the article is to provide information on the efficiency of low-load motor training in the patients with chronic pain in the lumbar spine. Three hypotheses were put forward. The first one says that motor control training reduces lower back pain; the second one is related to the change in pain intensity; the third hypothesis refers to the efficiency of sanatorium treatment with and without motor training. The study involved 30 women. A survery, the Oswerty Disability Index (ODI), and the Numeric Rating Scale (NRS) were used in the study. The data were statistically analyzed. The research showed changes in the intensity and strength of the felt pain as well as in motor disability measured with the ODI. Better results were achieved in the studied group. The results were analyzed and compared to the data gathered by other authors.
Celem pracy było dostarczenie informacji o efektywności treningu motorycznego w niskim obciążeniu u pacjentek z przewlekłym bólem lędźwiowo-krzyżowego odcinka kręgosłupa. Postawiono trzy hipotezy. Pierwsza, że trening kontroli motorycznej obniża dolegliwości bólowe dolnego odcinka kręgosłupa, druga wiązała się ze zmianą natężenia i intensywności odczuwanego bólu, trzecia zaś poruszała wydajność leczenia sanatoryjnego z treningiem motorycznym oraz bez treningu. W przeprowadzonych badaniach uczestniczyło 30 kobiet. Wykorzystano ankietę oraz kwestionariusz Oswestry i skalę NRS, których wyniki poddano analizie statystycznej. Badania wykazały zmiany w intensywności i natężeniu odczuwanego bólu, sile odczuwanego bólu oraz w niepełnosprawności ruchowej mierzonej kwestionariuszem Oswestry. Lepsze wyniki otrzymano w grupie badanej. Otrzymane wyniki analizowane i konfrontowane były z wynikami innych autorów.
Źródło:: Rocznik Lubuski; 2018, 44, 2a; 141-151
0485-3083
Pojawia się w:: Rocznik Lubuski
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigating the protection system of electric motors based on its main working parameters
Autorzy:: Manafov, Elshan
Isgandarov, Islam
Huseynov, Farid
Powiązania:: https://bibliotekanauki.pl/articles/2174836.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: electric motor
short circuit
overload
current sensors
voltage sensor
temperature sensors
relay control
protection system
silnik elektryczny
zwarcie
przeciążenie
czujniki prądu
czujnik napięcia
czujniki temperatury
sterowanie przekaźnikowe
system ochrony
Opis:: This research was devoted to the creation of a protection system for electric motors used in industry and transport, based on modern and traditional sensors. In the course of operation, the malfunctions of electric motors have been investigated and it was found that the accident modes occur mainly due to exceeding the permissible values of the current, voltage and temperature parameters. Modern sensors of current, voltage, and temperature have been compared and the most effective ones were selected for use in electric motors. Based on reasoning from these sensors, a protection system for a low-power electric motor has been developed in the laboratory. In addition, in the Multisim application software package, a simulation of the operation of the protection system at different voltage and current values was performed, and a circuit of the sensor control unit and the power source for powering the protection system was constructed. It has been proposed to apply such a multi-parametric complex protection system for electric motors, especially in transport.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 115; 63--74
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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