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1.
Conventional constant false alarm rate (CFAR) methods use a fixed number of cells to estimate the background variance. For homogeneous environments, it is desirable to increase the number of cells, at the cost of increased computation and memory requirements, in order to improve the estimation performance. For nonhomogeneous environments, it is desirable to use less number of cells in order to reduce the number of false alarms around the clutter edges. In this work, we present a solution with two exponential smoothers (first order IIR filters) having different time-constants to leverage the conflicting requirements of homogeneous and nonhomogeneous environments. The system is designed to use the filter having the large time-constant in homogeneous environments and to promptly switch to the filter having the small time constant once a clutter edge is encountered. The main advantages of proposed Switching IIR CFAR method are computational simplicity, small memory requirement (in comparison to windowing based methods) and its good performance in homogeneous environments (due to the large time-constant smoother) and rapid adaptation to clutter edges (due to the small time-constant smoother). 相似文献
2.
In this study, auto regressive with exogenous input (ARX) modeling is improved with fuzzy functions concept (FF-ARX). Fuzzy function with least squares estimation (FF-LSE) method has been recently developed and widely used with a small improvement with respect to least squares estimation method (LSE). FF-LSE is structured with only inputs and their membership values. This proposed model aims to increase the capability of the FF-LSE by widening the regression matrix with lagged input–output values. In addition, by using same idea, we proposed also two new fuzzy basis function models. In the first, basis of the fuzzy system and lagged input–output values are structured together in the regression matrix and named as “L-FBF”. Secondly, instead of using basis function, the membership values of the lagged input–output values are used in the regression matrix by using Gaussian membership functions, called “M-FBF”. Therefore, the power of the fuzzy basis function is also enhanced. For the corresponding models, antecedent part parameters for the input vectors are determined with fuzzy c-means (FCM) clustering algorithm. The consequent parameters of the all models are estimated with the LSE. The proposed models are utilized and compared for the identification of nonlinear benchmark problems. 相似文献
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4.
Lina Peng K. Selçuk Candan Christopher Mayer Karamvir S. Chatha Kyung Dong Ryu 《Multimedia Tools and Applications》2007,33(3):245-272
In this paper, we present the ARIA media processing workflow architecture that processes, filters, and fuses sensory inputs
and actuates responses in real-time. The components of the architecture are programmable and adaptable; i.e. the delay, size,
and quality/precision characteristics of the individual operators can be controlled via a number of parameters. Each data
object processed by qStream components is subject to transformations based on the parameter values. For instance, the quality of an output data object
and the corresponding processing delay and resource usage depend on the values assigned to parameters of the operators in
the object flow path. In Candan, Peng, Ryu, Chatha, Mayer (Efficient stream routing in quality- and resource-adaptive flow
architectures. In: Workshop on multimedia information systems, 2004), we introduced a class of flow optimization problems that promote creation and delivery of small delay or small resource-usage objects to the actuators in single-sensor, single-actuator
workflows. In this paper, we extend our attention to multi-sensor media processing workflow scenarios. The algorithms we present
take into account the implicit dependencies between various system parameters, such as resource consumption and object sizes.
We experimentally show the effectiveness and efficiency of the algorithms.
相似文献
Kyung Dong RyuEmail: |
5.
On Similarity Measures for Multimedia Database Applications 总被引:1,自引:1,他引:0
A multimedia database query consists of a set of fuzzy and boolean (or crisp) predicates, constants, variables, and conjunction,
disjunction, and negation operators. The fuzzy predicates are evaluated based on different media criteria, such as color,
shape, layout, keyword. Since media-based evaluation yields similarity values, results to such a query is defined as an ordered
set. Since many multimedia applications require partial matches, query results also include tuples which do not satisfy all
predicates. Hence, any fuzzy semantics which extends the boolean semantics of conjunction in a straight forward manner may
not be desirable for multimedia databases. In this paper, we focus on the problem of ‘given a multimedia query which consists of multiple fuzzy and crisp predicates, how to provide the user with a meaningful
overall ranking.’ More specifically, we study the problem of merging similarity values in queries with multiple fuzzy predicates. We describe
the essential multimedia retrieval semantics, compare these with the known approaches, and propose a semantics which captures
the retrieval requirements in multimedia databases.
Received 13 August 1999 / Revised 13 May 2000 / Accepted in revised form 26 July 2000 相似文献
6.
A distributed multimedia document presentation involves retrieval of objects from one or more document servers and their
presentation at the client system. The presentation of the multimedia objects has to be carried out in accordance with the
specification of temporal relationships between the objects. The retrieval of multimedia objects from the document server(s)
is influenced by factors such as temporal specification of objects presentations, throughput offered by the network service
provider, and the buffer resources on the client system. Flexibility in the temporal specification of the multimedia document
may help in deriving an object retrieval schedule that can handle variations in network throughput and buffer resource availability.
In this paper, we develop techniques for deriving a flexible object retrieval schedule for a distributed multimedia document
presentation. The schedule is based on flexible temporal specification of the multimedia document using the difference constrai
nts approach. We show how the derived retrieval schedule can be validated and modified to ensure that it can work with the
offered network throughput and the available buffer resources. 相似文献
7.
Mayer Christopher B. Candan K. Selçuk Sangam Venkatesh 《Multimedia Tools and Applications》2004,24(3):233-251
Because of their size, service times, and drain on server resources, multimedia objects require specialized replication systems in order to meet demand and ensure content availability. We present a novel method for creating replication systems where the replicated objects' sizes and/or per-object service times are large. Such replication systems are well-suited to delivering multimedia objects on the Internet. Assuming that user request patterns to the system are known, we show how to create replication systems that distribute read load to servers in proportion to their contribution to system capacity and experimentally show the positive load distribution properties of such systems. However, when user request patterns differ from what the system was designed for, system performance will be affected. Therefore, we also report on results that reveal (i) how server loads are affected and (ii) the impact two system design parameters (indicators of a system's load distribution qualities) have on server load when request patterns differ from that for which a system was designed. 相似文献
8.
9.
Elif Kacar Ahmet Erdem Mesure Mutlu Sanli Asgar Kayan Levent Candan Ufuk Yildiz Arif Demir 《Journal of Inorganic and Organometallic Polymers and Materials》2016,26(4):895-906
It is important to give water-repellent and antibacterial properties to the acrylonitrile butadiene styrene (ABS) surfaces of the hearing aids. In this study, the sol–gel Si and sol–gel Ti solutions were prepared from the reactions of silicon ethoxide, titanium butoxide and methacrylic acid. The catalyst and Dynasylan F8815 were added to the sol–gel solutions to give hydrophobic properties onto the ABS surfaces. Additionally, silver nanoparticles were synthesized by nanosecond laser and added to the coating solutions to give extra antibacterial properties. The surfaces of the ABS targets were coated using the sol–gel dip coating and pulsed laser deposition techniques. The coatings with good adhesion between film and substrate and good water-repellent properties were achieved. The average contact angles for the coated ABS surfaces were measured in the range between 120 and 125 degrees. The obtained sol–gel materials and produced thin films onto the ABS surfaces were also analyzed in terms of the antibacterial properties. The highly antibacterial properties were observed in the sol–gel solutions and the thin films. 相似文献
10.