scholarly journals Stochastic Analysis of a Computer System with Hardware Redundancy and Failure of Service Facility during Repair

2019 ◽  
Vol 178 (19) ◽  
pp. 19-26
Author(s):  
Amit Kumar ◽  
S. C.
Keyword(s):  
Computer System ◽  
Stochastic Analysis ◽  
Service Facility ◽  
Hardware Redundancy

Stochastic Analysis of a Computer System with Unit Wise Cold Standby Redundancy and Priority to Hardware Repair Subject to Failure of Service Facility

2020 ◽  
pp. 2150013
Author(s):  
S. C. Malik ◽  
R. K. Yadav
Keyword(s):  
Computer System ◽  
Stochastic Analysis ◽  
Busy Period ◽  
System Model ◽  
Profit Function ◽  
Reliability Measures ◽  
Service Facility ◽  
Time Treatment ◽  
Regenerative Point ◽  
Semi Markov Process

The use of semi-Markov process and regenerative point has been made for determining reliability measures of a computer system. The stochastic model is developed by considering the ideas of unit wise redundancy and failure of service facility. The treatment to the failed service facility is given in order to resume the jobs with full efficiency. The system is analyzed at different time points in the steady state. The profit of the system model has been obtained under the following two policies: In first policy, the profit is evaluated by taking cost per unit time for busy period of the service facility and cost per unit time treatment of the service facility. In second policy, the profit is evaluated by taking cost per unit hardware repair, per unit time software up-gradation and cost per unit time treatment of the service facility. The behavior of some reliability measures, such as MTSF, availability and profit function, has been shown graphically for arbitrary values of the parameters.

scholarly journals Stochastic Analysis of a Computer System with Unit Wise Cold Standby Redundancy and Failure of Service Facility

2020 ◽  
Vol 5 (3) ◽  
pp. 529-543
Author(s):  
R. K. Yadav ◽  
S. C. Malik
Keyword(s):  
Computer System ◽  
Probability Density Functions ◽  
Software Components ◽  
Treatment Rate ◽  
Repair Rate ◽  
Service Facility ◽  
Negative Exponential Distribution ◽  
Cold Standby ◽  
Negative Exponential ◽  
Similar Unit

Here, we analyze stochastically a computer system by taking one more similar unit (called computer system) in cold standby redundancy. The computer system consists of hardware and software components together. The provision of a single service facility has been made for repairing hardware and up-grading the software. The failure of the service facility is considered which resumes the jobs with full efficiency as new after availing treatment. The failure rates of hardware and software components as well as failure rate of the service facility are taken as constant and thus follow negative exponential distribution. The treatment rate of the service facility, repair rate of the hardware and up-gradation rate of the software follow arbitrary distributions with different probability density functions. Efforts have been made to determine reliability measures in steady state by using SMP and RPT. The behavior of MTSF, availability and also the profit function is observed graphically for some particular situations of the parameters.

Stochastic analysis of a xenix operating computer system with two down modes

1992 ◽  
Vol 32 (6) ◽  
pp. 781-791 ◽  
Author(s):  
L.R. Goel ◽  
Rakesh Gupta ◽  
V.S. Rana
Keyword(s):  
Computer System ◽  
Stochastic Analysis

STOCHASTIC ANALYSIS FOR THE DESCRIPTION AND SYNTHESIS OF PREDATOR–PREY SYSTEMS

1977 ◽  
Vol 109 (9) ◽  
pp. 1167-1174 ◽  
Author(s):  
Guy L. Curry ◽  
Don W. DeMichele
Keyword(s):  
Steady State ◽  
Mathematical Analysis ◽  
Queueing Theory ◽  
Stochastic Analysis ◽  
Analysis Approach ◽  
Systems Modeling ◽  
Service Facility ◽  
Predator Prey ◽  
System Components ◽  
Transient And Steady State

AbstractIn this paper, a stochastic analysis approach for predator–prey systems modeling is developed. The states of the system are assumed to have a natural probabilistic variation. Elements of queueing theory are used to describe these variations and to obtain both the transient and steady-state results for the system. The predator is considered analogous to a service facility and the prey as customers to be served. The Holling disk equation and mantid–fly experiments are analyzed by this approach. The method provides a framework for a straightforward synthesis of the system components and is readily generalized for multiple predator systems. Furthermore, hunger and other behavioral aspects can be easily incorporated into the mathematical analysis.

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

Remote real-time computer system for medical research and diagnosis

JAMA ◽  
1966 ◽  
Vol 196 (11) ◽  
pp. 967-972
Author(s):  
J. F. Dickson
Keyword(s):  
Medical Research ◽  
Real Time ◽  
Computer System
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