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排序方式: 共有48条查询结果,搜索用时 15 毫秒
1.
Iftekhar Ahmad Joarder Kamruzzaman Daryoush Habibi 《Neural computing & applications》2012,21(1):81-90
Resource sharing between book-ahead (BA) and instantaneous request (IR) reservation often results in high preemption rates
for ongoing IR calls in computer networks. High IR call preemption rates cause interruptions to service continuity, which
is considered detrimental in a QoS-enabled network. A number of call admission control models have been proposed in the literature
to reduce preemption rates for ongoing IR calls. Many of these models use a tuning parameter to achieve certain level of preemption
rate. This paper presents an artificial neural network (ANN) model to dynamically control the preemption rate of ongoing calls
in a QoS-enabled network. The model maps network traffic parameters and desired operating preemption rate by network operator
providing the best for the network under consideration into appropriate tuning parameter. Once trained, this model can be
used to automatically estimate the tuning parameter value necessary to achieve the desired operating preemption rates. Simulation
results show that the preemption rate attained by the model closely matches with the target rate. 相似文献
2.
This study presents a methodology for making bricks, in a cost-effective and environmentally friendly manner, using the tailings produced from iron ore mines in Western Australia (WA). The study was based on the geopolymerisation process, which is known to conserve energy by reducing the emission of greenhouse gases. The reduction is accomplished by avoiding the processes of high temperature kiln firing, traditionally utilised when making bricks from sandy soils with high clay content. In this study, the sodium silicate was added to the mine tailings in powder form, as an activator for the formulation of the geopolymer bricks. The effects of the initial setting time, curing temperature, curing time and activator content on the unconfined compressive strength (UCS), water absorption and other durability properties of the bricks were investigated. X-ray diffraction analysis was performed to investigate the phase composition of the geopolymer bricks. The bricks achieved an UCS as high as 50.53 MPa for the optimum values of the parameters. Technically, the geopolymer bricks that were produced met both the American Society of Testing and Materials and the Australian Standards (AS) requirements for bricks. A cost analysis of the geopolymer bricks is also presented, and this shows that the cost of geopolymer bricks is lower than that of the commercial, fired clay bricks. 相似文献
3.
Efficient optimization of network protection design with <Emphasis Type="Italic">p</Emphasis>-cycles
The purpose of this paper is to consider network survivability designs that utilize the p-cycle, and to propose a novel ILP formulation for capacity design based on network fundamental cycles, as well as the available
straddling links. Concepts of visible and hidden straddling links—which are essential components of the model presented herein—are
also introduced. The proposed model caters for the case of joint optimization of a p-cycle network that can be solved without enumerating p-cycle candidates. In addition, the complexity of the proposed model is much less than any conventional model dealing with
large size networks and suitable for the design of networks having multiple quality of protection (MQoP) service classes using
mixed protection techniques. 相似文献
4.
Daryoush A.S. Ackerman E. Samant N.R. Wanuga S. Kasemset D. 《Microwave Theory and Techniques》1991,39(12):2031-2044
An analysis of directly and externally modulated fiber-optic links is presented. The theoretical analysis is based on the signal flow diagram of the interface circuits to the laser diode, Mach-Zehnder electro-optic modulator, and p-i-n photodiode. System parameters such as gain, noise figure, two-tone intermodulation distortion, and spurious free and compression dynamic range are expressed as a function of frequency and operating point of the laser and external modulator. Two directly and externally modulated fiber-optic links were designed and fabricated to verify the analytical models. The direct modulation FO link was developed at the Ku -band (11.6-12.4 GHz), whereas the external modulation link was at L -band (875-925 MHz). Spurious-free dynamic ranges of 95.8 dB Hz2/3 and 113 dB Hz 2/3, respectively, were achieved. The predictions based on the analytical models match the measured results 相似文献
5.
This paper presents theoretical and experimental results of a low-power-consuming hybrid push-pull self-oscillating mixer (SOM) circuit at the UHF frequency band. The frequency-stable SOM circuit is designed and fabricated using matched-pair Si bipolar junction transistors and high-Q resonators, where measured phase noise of this free-running voltage-controlled oscillator is -101.2 dBc/Hz at 100-kHz offset. A 20-dB up-conversion gain, a compression dynamic range (CDR) of 65 dB·MHz, and a spurious-free dynamic range of 50 dB·MHz 2/3 are also measured for the mixer portion of this SOM. Moreover, a down-conversion gain of ≈-2 dB with a CDR of 100 dB·MHz is also measured 相似文献
6.
SPEEK/cSMM membrane for simultaneous electricity generation and wastewater treatment in microbial fuel cell 下载免费PDF全文
7.
Ghasem Sargazi Daryoush Afzali Ali Ghafainazari Hamideh Saravani 《Journal of Inorganic and Organometallic Polymers and Materials》2014,24(4):786-790
Metal-organic framework (MOF) has been shown to potential applications due to the high porous hybrid structure. Cobalt MOF was synthesized rapidly by ultrasound energy with about 3,000 m2/g surface area by BET method. Furthermore, this component is crystalline with significant thermal stability, on account of X-ray diffraction and thermal analysis, respectively. Based on high roughness, crystallinity, and unreported type of FTIR spectrum, a new structure of Co-MOF structure was proposed. 相似文献
8.
9.
Long‐term study of CO2 absorption by PVDF/ZSM‐5 hollow fiber mixed matrix membrane in gas–liquid contacting process 下载免费PDF全文
Masoud Rahbari‐Sisakht Ahmad Fauzi Ismail Takeshi Matsuura Daryoush Emadzadeh 《应用聚合物科学杂志》2017,134(14)
In order to fabricate hollow fiber mixed matrix membrane (HFMMM) for long‐term CO2 absorption process, ZSM‐5 (Zeolite Socony Mobil–5) zeolite was modified using hexadecyltrichlorosilane for increasing hydrophobicity and then added to the polyvinylidene fluoride (PVDF) spinning dope. The in‐house made HFMMMs were characterized in terms of gas permeance, overall porosity, average pore size, effective surface porosity, surface roughness, mechanical stability, and wetting resistance. The morphology of the HFMMMs was studied using SEM. The cross‐sectional SEM images indicated that the membrane structure has changed from sponge‐like to finger‐like by ZSM‐5 loading. The surface roughness increased by increasing ZSM‐5 concentration in the spinning dope. The HFMMM spun from the spinning dope with 0.5 wt % of ZSM‐5 zeolite showed that the CO2 absorption flux decreased 18.9% in the initial 115 h of the operation and then the absorption flux remained constant until the end of the operation. For plain PVDF HFM the absorption flux decreased 36% from the initial value in the first 15 h of the experiment. Thus it could be concluded that the long term stability of HFM was improved by the incorporation of ZSM‐5. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44606. 相似文献
10.
Experimental results of indirect optical injection-locking of two X-band oscillators are presented. An S-band master source is used to lock both oscillators over 18 MHz using the laser diode nonlinearities. System FM noise degradation is 14 dB and the means to improve system performance are suggested. 相似文献