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1.
Hachem Moussa Tong Gao I-Ling Yen Farokh Bastani Jun-Jang Jeng 《Service Oriented Computing and Applications》2010,4(1):17-31
Many application domains are increasingly leveraging service-oriented architecture (SOA) techniques to facilitate rapid system
deployment. Many of these applications are time-critical and, hence, real-time assurance is an essential step in the service
composition process. However, there are gaps in existing service composition techniques for real-time systems. First, admission
control is an essential technique to assure the time bound for service execution, but most of the service composition techniques
for real-time systems do not take admission control into account. A service may be selected for a workflow during the composition
phase, but then during the grounding phase, the concrete service may not be able to admit the workload. Thus, the entire composition
process may have to be repeated. Second, communication time is an important factor in real-time SOA, but most of the existing
works do not consider how to obtain the communication latencies between services during the composition phase. It is clear
that maintaining a full table of communication latencies for all pairs of services is infeasible. Obtaining communication
latencies between candidate services during the composition phase can also be costly, since many candidate services may not
be used for grounding. Thus, some mechanism is needed for estimating the communication latency for composite services. In
this paper, we propose a three-phase composition approach to address the above issues. In this approach, we first use a highly
efficient but moderately accurate algorithm to eliminate most of the candidate compositions based on estimated communication
latencies and assured service response latency. Then, a more accurate timing prediction is performed on a small number of
selected compositions in the second phase based on confirmed admission and actual communication latency. In the third phase,
specific concrete services are selected for grounding, and admissions are actually performed. The approach is scalable and
can effectively achieve service composition for satisfying real-time requirements. Experimental studies show that the three-phase
approach does improve the effectiveness and time for service composition in SOA real-time systems. In order to support the
new composition approach, it is necessary to effectively specify the needed information. In this paper, we also present the
specification model for timing-related information and the extension of OWL-S to support this specification model. 相似文献
2.
3.
In this paper, we address the identification problem of p-inputs q-outputs MA models, corrupted by a white noise with unknown covariance matrix, in the case where p<q. Under certain additional conditions, we show that the generating function of the MA model is identifiable (up to a p×p constant orthogonal matrix) from the autocovariance function of the observation. Our results extend those already obtained in Desbouvries et al. [5] and Desbouvries and Loubaton [6]. 相似文献
4.
This paper presents a dynamic programming approach for the solution of the unit loading problem in hydroplant management. The model accounts for losses in the hydraulic network and head variations which are functions of the decision variables' values. A judicious change of variable allows the problem to be decomposed hierarchically so that it can be solved by a succession of dynamic programs. This approach solves the unit loading problem corrected for losses without additional computational effort. 相似文献
5.
Nickel extraction, in sulphuric medium, by different dialkyldithiophosphoric acids is studied. The alkyl group shows a strong effect on the distribution of the extractant and a small one on the distribution of the nickel. The kinetics of extraction of nickel are strongly dependent on the alkyl group. 相似文献
6.
Kammoun A. Kharouf M. Hachem W. Najim J. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2009,55(10):4386-4397
This paper is devoted to the study of the performance of the linear minimum mean-square error (LMMSE) receiver for (receive) correlated multiple-input multiple-output (MIMO) systems. By the random matrix theory, it is well known that the signal-to-noise ratio (SNR) at the output of this receiver behaves asymptotically like a Gaussian random variable as the number of receive and transmit antennas converge to +infin at the same rate. However, this approximation being inaccurate for the estimation of some performance metrics such as the bit error rate (BER) and the outage probability, especially for small system dimensions, Li proposed convincingly to assume that the SNR follows a generalized gamma distribution which parameters are tuned by computing the first three asymptotic moments of the SNR. In this paper, this technique is generalized to (receive) correlated channels, and closed-form expressions for the first three asymptotic moments of the SNR are provided. To obtain these results, a random matrix theory technique adapted to matrices with Gaussian elements is used. This technique is believed to be simple, efficient, and of broad interest in wireless communications. Simulations are provided, and show that the proposed technique yields in general a good accuracy, even for small system dimensions. 相似文献
7.
T. Roelandt B. Thys† C. Heughebaert A. De Vroede K. De Paepe‡ D. Roseeuw B. Rombaut† J.-P. Hachem 《International journal of cosmetic science》2009,31(4):247-254
The stratum corneum (SC) is a biosensor that mediates responses to a variety of exogenous insults through various signalling mechanisms, including the activation of SC serine proteases (SP) kallikrein cascade. The SPINK5 gene encodes an SP inhibitor, the lympho-epithelial-Kazal-type-1 inhibitor (LEKTI-1), which in turn will buffer the excess of SP cascade initiation, key in the maintenance of permeability barrier homeostasis. We demonstrate that LEKTI processing can occur within the SC after secretion from stratum granulosum keratinocytes at least partially by klk7, an SC-specific chymotryptic SP. Unlike the recently described LEKTI-2, neither recombinant full-length LEKTI-1 nor recombinant LEKTI-1 fragments exhibit antimicrobial activity. Finally, we discuss the pathophysiological implications of LEKTI-1 in skin biology as well as its contribution to the pathogenesis of Netherton Syndrome and its potential involvement in atopic dermatitis. 相似文献
8.
Glass lubricants are often used for many hot forming processes to minimize friction and to protect tools from premature thermal fatigue. In this paper, an identification procedure is presented to identify the viscosity of a glass lubricant. The identification of the viscosity of the glass lubricant is performed using an upsetting thermomechanical test. The test is designed to trap the lubricant between two workpieces made with the same super alloy as the one used for the industrial process. The measurement of the trapped lubricant thickness for different temperatures and strain rates conditions enables the identification of the lubricant's viscosity. Numerical simulations are performed using the identified viscosity to validate the methodology. Two different numerical approaches are compared. A classical updated Lagrangian approach and a monolithic Eulerian approach. 相似文献
9.
10.
Elena Bozzola Mauro Bozzola Andrzej Krzysztofiak Alberto Eugenio Tozzi May El Hachem Alberto Villani 《International journal of molecular sciences》2016,17(5)
Even if varicella is generally considered a harmless disease in childhood, severe complications may occur. We examined varicella skin complications (VSCs) in hospitalized immunologically healthy children, over a nine-year period. We also systematically analyzed previous reports to calculate the rate of VSCs in the literature. VSCs occurred in 16.4% of children hospitalized for varicella. This figure is in accordance with the literature, as the range of VSCs was 2.6%–41.2%. Skin complications may represent determinants of hospitalization and of other indirect costs in young children. 相似文献