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Wyszukujesz frazę "time server" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Time server based on NMEA and SNTP Protocols
Autorzy:
Łukasik, Z.
Nowakowski, W.
Ciszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/116756.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
time service
NMEA Protocol
SNTP Protocol
time server
time synchronization
Computer Network
GPS receiver
Universal Time Coordinated (UTC)
Opis:
Modern technical ship systems very often use information and communication technologies. One of the basic requirements of these systems is ensuring time synchronization that aim is to coordinate clocks of all devices working in a computer network. This requirement results from, among others, the necessity to log events with a unified timestamp. To achieve this goal, most frequently expensive time servers are used. This article presents an easy method of time synchronization, which can serve as a reserve or alternative solution to the methods currently used. That is why a proprietary software has been developed, allowing to expand the functionality of a PC so that it can operate as a time server. A time reference in proposed solution would be provided by a GPS receiver. The developed application allows, with the use of the NMEA protocol, to synchronize the current time with the GPS receiver and then, with the help of the SNTP protocol, to distribute it to all network devices operating on the ship.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 453-458
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzorcowe sygnały czasu i częstotliwości
Time and frequency signals
Autorzy:
Łoniewski, D.
Skonieczny, W.
Stachnik, A.
Powiązania:
https://bibliotekanauki.pl/articles/317650.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
radiokomunikacja
sygnały wzorcowe
dystrybucja sygnałów czasu
serwery czasu
NTP
GPS
UTC
radiocommunication
standard signals
signal transfer
time server
Opis:
Szczegółowo omówiono zagadnienia utrzymania na poziomie najwyższej dokładności jednolitego w skali światowej czasu, a także system rozsyłania sygnałów czasu w sieciach informatycznych. Zaprezentowano związane z tą tematyką badania prowadzone w Instytucie Łączności oraz przedstawiono uzyskane rezultaty.
The article describes the problem of maintenance of worldwide time coordination and distribution of time signals in computer networks. The results of the research, carried out in The National Institute of Telecommunication, are presented.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2002, 3-4; 51-71
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomaly detection in server metrics with use of one-sided median algorithm
Autorzy:
Zacher, S.
Ryba, P.
Powiązania:
https://bibliotekanauki.pl/articles/972918.pdf
Data publikacji:
2017
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
anomaly detection
time series
one-sided median
server metrics
Opis:
In this paper we consider the problem of anomaly detection over time series metrics data took from one of corporate grade mail service cluster. We propose the algorithm based on one-sided median concept and present some results of experiments showing impact of parameters settings on algorithm performance. In addition we present short description of classes of anomalies discovered in monitored system. Proposed one-sided median based algorithm shows great robustness and good detection rate and can be considered as possible simple production ready solution.
Źródło:
Journal of Applied Computer Science Methods; 2017, 9 No. 1; 5-22
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analysis of Message Delay in SIP Proxy Server
Autorzy:
Abaev, P.
Razumchik, R.
Uglov, I.
Powiązania:
https://bibliotekanauki.pl/articles/958112.pdf
Data publikacji:
2014
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
single hop delay
SIP server
statistical analysis
waiting time
Opis:
Single hop delay of SIP message going through SIP proxy server operating in carriers backbone network is being analyzed. Results indicate that message sojourn times inside SIP server in most cases do not exceed order of tens of milliseconds (99% of all SIP-I messages experience less than 21 ms of sojourn delay) but there were observed very large delays which can hardly be attributed to message specic processing procedures. It is observed that delays are very variable. Delay components distribution that is to identied are not exponentially distributed or nearly constant even per message type or size. The authors show that measured waiting time and minimum transit time through SIP server can be approximated by acyclic phase-type distributions but accuracy of approximation at very high values of quantiles depends on the number outliers in the data. This nding suggests that modeling of SIP server with queueing system of GjPHjc type may server as an adequate solution.
Źródło:
Journal of Telecommunications and Information Technology; 2014, 4; 79-87
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A discrete-time system with service control and repairs
Autorzy:
Atencia, I.
Powiązania:
https://bibliotekanauki.pl/articles/331340.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
discrete time queue
unreliable server
negative customers
busy period
sojourn times
continuous time counterpart
serwer niepewny
odbiorca ujemny
system czasu dyskretnego
Opis:
This paper discusses a discrete-time queueing system with starting failures in which an arriving customer follows three different strategies. Two of them correspond to the LCFS (Last Come First Served) discipline, in which displacements or expulsions of customers occur. The third strategy acts as a signal, that is, it becomes a negative customer. Also examined is the possibility of failures at each service commencement epoch. We carry out a thorough study of the model, deriving analytical results for the stationary distribution. We obtain the generating functions of the number of customers in the queue and in the system. The generating functions of the busy period as well as the sojourn times of a customer at the server, in the queue and in the system, are also provided. We present the main performance measures of the model. The versatility of this model allows us to mention several special cases of interest. Finally, we prove the convergence to the continuous-time counterpart and give some numerical results that show the behavior of some performance measures with respect to the most significant parameters of the system.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 471-484
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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