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11.
Thornton J Savvides M Vijaya Kumar BV 《IEEE transactions on pattern analysis and machine intelligence》2007,29(4):596-606
We describe a general probabilistic framework for matching patterns that experience in-plane nonlinear deformations, such as iris patterns. Given a pair of images, we derive a maximum a posteriori probability (MAP) estimate of the parameters of the relative deformation between them. Our estimation process accomplishes two things simultaneously: it normalizes for pattern warping and it returns a distortion-tolerant similarity metric which can be used for matching two nonlinearly deformed image patterns. The prior probability of the deformation parameters is specific to the pattern-type and, therefore, should result in more accurate matching than an arbitrary general distribution. We show that the proposed method is very well suited for handling iris biometrics, applying it to two databases of iris images which contain real instances of warped patterns. We demonstrate a significant improvement in matching accuracy using the proposed deformed Bayesian matching methodology. We also show that the additional computation required to estimate the deformation is relatively inexpensive, making it suitable for real-time applications 相似文献
12.
Mitra S Savvides M Brockwell A 《IEEE transactions on pattern analysis and machine intelligence》2007,29(4):517-530
As biometric authentication systems become more prevalent, it is becoming increasingly important to evaluate their performance. This paper introduces a novel statistical method of performance evaluation for these systems. Given a database of authentication results from an existing system, the method uses a hierarchical random effects model, along with Bayesian inference techniques yielding posterior predictive distributions, to predict performance in terms of error rates using various explanatory variables. By incorporating explanatory variables as well as random effects, the method allows for prediction of error rates when the authentication system is applied to potentially larger and/or different groups of subjects than those originally documented in the database. We also extend the model to allow for prediction of the probability of a false alarm on a "watch-list" as a function of the list size. We consider application of our methodology to three different face authentication systems: a filter-based system, a Gaussian mixture model (GMM)-based system, and a system based on frequency domain representation of facial asymmetry 相似文献
13.
We consider selfish routing over a network consisting of m parallel
links through which $n$ selfish users route their traffic trying to
minimize their own expected latency. We study the class of mixed
strategies in which the expected latency through each link is at most
a constant multiple of the optimum maximum latency had global
regulation been available. For the case of uniform links it is known
that all Nash equilibria belong to this class of strategies. We are
interested in bounding the coordination ratio (or price of anarchy) of
these strategies defined as the worst-case ratio of the maximum (over
all links) expected latency over the optimum maximum latency. The load
balancing aspect of the problem immediately implies a lower bound
Ω(ln m ln ln m) of the coordination
ratio. We give a tight (up to a multiplicative constant) upper bound.
To show the upper bound, we analyze a variant of the classical balls
and bins problem, in which balls with arbitrary weights are placed
into bins according to arbitrary probability distributions. At the
heart of our approach is a new probabilistic tool that we call ball
fusion; this tool is used to reduce the variant of the problem where
balls bear weights to the classical version (with no weights). Ball
fusion applies to more general settings such as links with arbitrary
capacities and other latency functions. 相似文献
14.
M. Imran Rafiq Marios K. Chryssanthopoulos Toula Onoufriou 《Reliability Engineering & System Safety》2004,86(3):247-256
Uncertainties associated with modelling of deteriorating bridges strongly affect management decisions, such as inspection, maintenance and repair actions. These uncertainties can be reduced by the effective use of health monitoring systems, through which information regarding in situ performance can be incorporated in the management of bridges.The objectives of this paper are twofold; first, an improved chloride induced deterioration model for concrete bridges is proposed that can quantify degradation in performance soon after chlorides are deposited on the bridge, rather than when initiation of corrosion at the reinforcement level takes place. As a result, the implications of introducing proactive health monitoring can be assessed using probabilistic durability criteria. Thus, the second objective of the paper is to present a methodology for performance updating of deteriorating concrete bridges fitted with a proactive health monitoring system.This methodology is illustrated via a simple example of a typical bridge element, such as a beam or a part of a slab. The results highlight the benefits from introducing ‘smart’ technology in managing bridges subject to deterioration, and quantify the reduction in uncertainties and their subsequent effect on predictions of future bridge performance. 相似文献
15.
DCAF: An MPEG-21 Dynamic Content Adaptation Framework 总被引:1,自引:3,他引:1
Universal Multimedia Access aims at providing a gratifying end user-experience by either adapting the content, be it static
or dynamic, to suit the usage environment or adapting the usage environment, be it client- or server-centric, to suit content.
This paper presents our MPEG-21 Dynamic Content Adaptation Framework, acronym DCAF, which uses a fusion of Genetic Algorithms
and Strength Pareto Optimality to adapt content in order to suit the usage environment.
相似文献
Marios C. Angelides (Corresponding author)Email: |
16.
17.
Distributed adaptive fault‐tolerant leader‐following formation control of nonlinear uncertain second‐order multi‐agent systems 下载免费PDF全文
Mohsen Khalili Xiaodong Zhang Yongcan Cao Marios M. Polycarpou Thomas Parisini 《国际强度与非线性控制杂志
》2018,28(15):4287-4308
》2018,28(15):4287-4308
This paper presents a distributed integrated fault diagnosis and accommodation scheme for leader‐following formation control of a class of nonlinear uncertain second‐order multi‐agent systems. The fault model under consideration includes both process and actuator faults, which may evolve abruptly or incipiently. The time‐varying leader communicates with a small subset of follower agents, and each follower agent communicates to its directly connected neighbors through a bidirectional network with possibly asymmetric weights. A local fault diagnosis and accommodation component are designed for each agent in the distributed system, which consists of a fault detection and isolation module and a reconfigurable controller module comprised of a baseline controller and two adaptive fault‐tolerant controllers, activated after fault detection and after fault isolation, respectively. By using appropriately the designed Lyapunov functions, the closed‐loop stability and asymptotic convergence properties of the leader‐follower formation are rigorously established under different modes of the fault‐tolerant control system. 相似文献
18.
Marios C Kyriacou Anastasios S Siomos Ioannnis M Ioannides Dimitrios Gerasopoulos 《Journal of the science of food and agriculture》2009,89(11):1955-1962
BACKGROUND: Crop management has been implicated in tuber sugar accumulation and potato processing quality. However, reports on potato postharvest behaviour, tuber composition and processing quality in response to crop nitrogen (N) fertilisation have been sparse and inconclusive. In this study, chipping potato cv. Hermes was treated with four preplanting N rates (0, 100, 200 and 300 kg ha?1) to evaluate the effect of N fertilisation on sugar accumulation profiles and processing quality at harvest, after cold storage at 4.5 °C for up to 200 days and after reconditioning at 16 °C for 10–30 days. RESULTS: Preharvest leaf petiole analysis and tuber nitrate analysis at harvest confirmed crop response to N rates. At harvest, tuber specific gravity decreased marginally beyond 200 kg N ha?1. Chip colour as well as tuber sucrose and reducing sugar (RS) content was unaffected by N fertilisation rate. During cold storage and reconditioning, tuber fresh weight loss and sprout growth were unaffected by N rate, while its effect on tuber sugar levels was either statistically or practically insignificant. Tuber sucrose and RS contents correlated highly with chip colour (r = ? 0.729, P <0.001 and r = ?0.791, P <0.001 respectively). Importantly, postharvest chip colour was also unaffected by N rate, though it declined markedly with the onset of cold storage and improved significantly throughout reconditioning. Differences in chip colour between years were limited but potentially critical in meeting the commercial standard. CONCLUSION: Completion of physiological crop senescence of the spring potato crop under Mediterranean climatic conditions seems to mitigate the potential interference of preplanting N fertilisation with tuber maturation and subsequently cold storage performance, reconditioning potential and processing quality. Copyright © 2009 Society of Chemical Industry 相似文献
19.
We present a model for anchoring categorical conceptual information which originates from physical perception and the web. The model is an extension of the anchoring framework which is used to create and maintain over time semantically grounded sensor information. Using the augmented anchoring framework that employs complex symbolic knowledge from a commonsense knowledge base, we attempt to ground and integrate symbolic and perceptual data that are available on the web. We introduce conceptual anchors which are representations of general, concrete conceptual terms. We show in an example scenario how conceptual anchors can be coherently integrated with perceptual anchors and commonsense information for the acquisition of novel concepts. 相似文献
20.
Panagiotis Theofilis Marios Sagris Evangelos Oikonomou Alexios S. Antonopoulos Konstantinos Tsioufis Dimitris Tousoulis 《International journal of molecular sciences》2022,23(6)
Platelets are at the forefront of human health and disease following the advances in their research presented in past decades. Platelet activation, their most crucial function, although beneficial in the case of vascular injury, may represent the initial step for thrombotic complications characterizing various pathologic states, primarily atherosclerotic cardiovascular diseases. In this review, we initially summarize the structural and functional characteristics of platelets. Next, we focus on the process of platelet activation and its associated factors, indicating the potential molecular mechanisms involving inflammation, endothelial dysfunction, and miRs. Finally, an overview of the available antiplatelet agents is being portrayed, together with agents possessing off-set platelet-inhibitory actions, while an extensive presentation of drugs under investigation is being given. 相似文献