5,600 research outputs found
Analysis of Single Buffer Random Polling System With State-Dependent Input Process and Server/Station Breakdowns
No full textModels and analytical techniques are developed to evaluate the performance of two variations of single buffers (conventional and buffer relaxation system) multiple queues system. In the conventional system, each queue can have at most one customer at any time and newly arriving customers find the buffer full are lost. In the buffer relaxation system, the queue being served may have two customers, while each of the other queues may have at most one customer. Thomas Y.S. Lee developed a state-dependent non-linear model of uncertainty for analyzing a random polling system with server breakdown/repair, multi-phase service, correlated input processes, and single buffers. The state-dependent non-linear model of uncertainty introduced in this paper allows us to incorporate correlated arrival processes where the customer arrival rate depends on the location of the server and/or the server's mode of operation into the polling model. The author allows the possibility that the server is unreliable. Specifically, when the server visits a queue, Lee assumes that the system is subject to two types of failures: queue-dependent, and general. General failures are observed upon server arrival at a queue. But there are two possibilities that a queue-dependent breakdown (if occurs) can be observed; (i) is observed immediately when it occurs and (ii) is observed only at the end of the current service. In both cases, a repair process is initiated immediately after the queue-dependent breakdown is observed. The author's model allows the possibility of the server breakdowns/repair process to be non-stationary in the number of breakdowns/repairs to reflect that breakdowns/repairs or customer processing may be progressively easier or harder, or that they follow a more general learning curve. Thomas Y.S. Lee will show that his model encompasses a variety of examples. He was able to perform both transient and steady state analysis. The steady state analysis allows us to compute several performance measures including the average customer waiting time, loss probability, throughput and mean cycle time.</jats:p
Radiation-hardening of low noise readout integrated circuit for infrared focal plane arrays
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Steady shear and viscoelastic behaviors of polyaniline suspension as an electrorheological fluid
No full textThe steagy shear and viscoelastic behaviors of polyaniline suspension in the mineral oil subject to an electric field were studied experimentally using a Couette cell type rheometer. The dynamic yield stress determined from the plateau stress in the range of low shear rate was evaluated as a function of the applied field and particle volume fraction. The resultant yield stress is linearly increased with volume fraction and E. The storage shear modulus and loss modulus have been measured using small amplitude forced oscillatory dynamic test as functions of strain amplitude, driving frequency, and the applied field strength. The linear viscoelastic region was found to be as below 0.01 of strain amplitude by performing the amplitude sweep test. The storage and loss moduli were strongly dependent upon strain amplitude while those were nearly independent of the driving frequency for the range of 10∼10rad/s
Experimental studies of isobutene (R600a) as the refrigerant in domestic refrigeration system
No full textAnalysis and design of dirty paper coding by transformation of noise
No full textThis work was supported by the center for Broadband
OFDM Mobile Access (BrOMA) at POSTECH through the
ITRC program of the Korean MIC, supervised by IITA.
(IITA-2006-C1090-0603-0037
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