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排序方式: 共有282条查询结果,搜索用时 15 毫秒
1.
In executing tasks involving intelligent information processing, the human brain performs better than the digital computer. The human brain derives its power from a large number [O(1011)] of neurons which are interconnected by a dense interconnection network [O(105) connections per neuron]. Artificial neural network (ANN) paradigms adopt the structure of the brain to try to emulate the intelligent information processing methods of the brain. ANN techniques are being employed to solve problems in areas such as pattern recognition, and robotic processing. Simulation of ANNs involves implementation of large number of neurons and a massive interconnection network. In this paper, we discuss various simulation models of ANNs and their implementation on distributed memory systems. Our investigations reveal that communication-efficient networks of distributed memory systems perform better than other topologies in implementing ANNs. 相似文献
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3.
Graft copolymerization of acrylonitrile (AN) onto acetylated chemically modified jute was carried out in the temperature range 40–60°C using V5+-cyclohexanone redox initiator system. The effects of temperature, time, concentrations of metal ion (V5+), monomer (AN), cyclohexanone, some inorganic salts, and organic solvents on percent grafting have been studied. IR spectra of acetylated chemically modified jute and grafted jute have been taken, and their characteristic bands have been identified. Grafting has improved the thermal stability and also the lightfastness rating of jute fibers dyed with basic dyes. 相似文献
4.
In large antenna arrays, the possibility of occurrence of faults in some of the radiating elements cannot be precluded at all times. In such situations, the radiation pattern of the array gets distorted, mostly with an increase in sidelobe level and decrease in gain. Although it is not possible to restore the pattern fully by rearranging the excitations of the functioning elements, compensation methods have been reported in the literature for restoring one performance parameter of the array and making a trade‐off on some other parameter. In this article, we have made a study on the tolerance level of this compensation process. One part of the study deals with the thinning in the failed array, that is, to find a limit on the minimum number of functioning elements of the array that can restore the digital beamforming of the failed array. The second part of study deals with finding the maximum number of element failures that can be compensated. The study was carried out by optimizing the amplitude excitations of the failed array. Instead of classical optimization techniques, particle swarm optimization was used for the compensation process. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:635–645, 2014. 相似文献
5.
Pavan Kumar Gangineni Satyaroop Patnaik Rajesh Kumar Prusty Bankim Chandra Ray 《应用聚合物科学杂志》2021,138(46):51365
The study aims at investigating the mechanical behavior of carbon fiber reinforced polymer (CFRP) composites modified with graphene carboxyl at elevated temperature (ET-110°C) and understanding the effect of electrophoretic deposition bath concentration (0.5 g/L, 1.0 g/L, and 1.5 g/L) on their mechanical behavior at ET. The 1.5 g/L composite has revealed a maximum improvement in energy absorbed before failure of 33.25% at RT and 22.54% at ET for flexural testing and ∼35% at RT for short beam shear testing, over neat CFRP composite. The modified composites have shown an improved flexural strain to failure at both RT and ET, with 1.5 g/L composite exhibiting maximum enhancement of 12.41% at RT and 26.52% at ET over neat composite. However, at ET, modified composites exhibited lower flexural strength and interlaminar shear strength values in comparison to that of neat. Viscoelastic behavior of all composites was studied to understand bath concentration's effect on thermal behavior via dynamic mechanical thermal analysis. Differential scanning calorimetry was employed for governing the glass transition temperature of composites. Fractography of tested samples (both ET and RT) was performed utilizing a scanning electron microscope to determine the prominent failure mode. 相似文献
6.
The sulfidation kinetics and morphological development of reaction products are reported for Fe-9 and 18 at.% Al alloys exposed at 1173 K to H2S-H2 atmospheres at sulfur pressures in the range 10–1–103 Pa. The Fe-9 Al alloy sulfidized parabolically at
Pa giving rise to a duplex scale composed of an outer Al-doped FeS layer and an inner FeS + FeAl2S4 lamellar layer and to an internal sulfidation zone containing Al2S3 precipitates. The Fe-18 Al alloy which was sulfidized at
. 相似文献
7.
Finding fault elements in linear antenna arrays using bacteria foraging optimization (BFO) is presented. One of the better options of array diagnosis is to perform it by measuring the radiated field, because in this case, removal of the array from its working site is not required and thereby not interrupting its normal operation. This task of fault finding from far‐field data is designed as an optimization problem where the difference between the far‐field power pattern obtained for a given configuration of failed element(s) and the measured one is minimized w. r. t. the excitations of the array elements. This set of excitations on comparison with the excitations of the original array gives the idea of the fault position and their type, such as either complete fault or partial fault. BFO being relatively new to microwave community when compared with other soft‐computing techniques, its performance was observed w. r. t. time of computation and convergence of the iterative process. Possibility of finding the faults from random sample points and use of minimum number of sample points for array fault finding are the novelties of the present work. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2013. 相似文献
8.
Engineering with Computers - The vibration and damping characteristics of carbon nanotubes reinforced (CNTR) skewed shell structure under a hygrothermal environment have been investigated using the... 相似文献
9.
A simple decision tree-based disturbance monitoring system for VSC-based HVDC transmission link integrating a DFIG wind farm 下载免费PDF全文
Fault detection and classification is a key challenge for the protection of High Voltage DC (HVDC) transmission lines.
In this paper, the Teager–Kaiser Energy Operator (TKEO) algorithm associated with a decision tree-based fault classi
f
ier is proposed to detect and classify various DC faults. The Change Identification Filter is applied to the average and
differential current components, to detect the first instant of fault occurrence (above threshold) and register a Change
Identified Point (CIP). Further, if a CIP is registered for a positive or negative line, only three samples of currents (i.e.,
CIP and each side of CIP) are sent to the proposed TKEO algorithm, which produces their respective 8 indices through
which the, fault can be detected along with its classification. The new approach enables quicker detection allowing
utility grids to be restored as soon as possible. This novel approach also reduces computing complexity and the time
required to identify faults with classification. The importance and accuracy of the proposed scheme are also thor
oughly tested and compared with other methods for various faults on HVDC transmission lines. 相似文献
10.
Debprakash Patnaik Srivatsan Laxman Naren Ramakrishnan 《Knowledge and Information Systems》2011,29(2):273-303
Mining temporal network models from discrete event streams is an important problem with applications in computational neuroscience,
physical plant diagnostics, and human–computer interaction modeling. In this paper, we introduce the notion of excitatory
networks which are essentially temporal models where all connections are stimulative, rather than inhibitive. The emphasis
on excitatory connections facilitates learning of network models by creating bridges to frequent episode mining. Specifically,
we show that frequent episodes help identify nodes with high mutual information relationships and that such relationships
can be summarized into a dynamic Bayesian network (DBN). This leads to an algorithm that is significantly faster than state-of-the-art
methods for inferring DBNs, while simultaneously providing theoretical guarantees on network optimality. We demonstrate the
advantages of our approach through an application in neuroscience, where we show how strong excitatory networks can be efficiently
inferred from both mathematical models of spiking neurons and several real neuroscience datasets. 相似文献