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排序方式: 共有251条查询结果,搜索用时 31 毫秒
221.
In order to realize direct thrust control instead of traditional sensor-based control for aero-engines,it is indispensable to design a thrust estimator with high accuracy,so a scheme for thrust estimator design based on the least square support vector regression machine is proposed to solve this problem. Furthermore,numerical simulations confirm the effectiveness of our presented scheme. During the process of estimator design,a wrapper criterion that can not only reduce the computational complexity but also enhance the generalization performance is proposed to select variables as input variables for estimator. 相似文献
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一种面向服务的数据集成平台 总被引:1,自引:0,他引:1
提出一种松散耦合的数据集成解决方案,将异构数据源作为服务提供者从集成系统中分离出来,采用目前较为流行的基于中介器/包装器的数据集成方法,自底向上地将数据源集成为统一的数据视图——集成处理包,并初步实现了一个原型系统。重点介绍了该系统的体系构架,以及数据集成处理包的结构设计和创建过程,最后,通过实例验证了此方案的灵活性和有效性。 相似文献
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226.
K-匿名算法通过对数据的泛化、隐藏等手段使得数据达到K-匿名条件,在隐藏特征的同时考虑数据的隐私性与分类性能,可以视为一种特殊的特征选择方法,即K-匿名特征选择。K-匿名特征选择方法结合K-匿名与特征选择的特点使用多个评价准则选出K-匿名特征子集。过滤式K-匿名特征选择方法难以搜索到所有满足K-匿名条件的候选特征子集,不能保证得到的特征子集的分类性能最优,而封装式特征选择方法计算成本很大,因此,结合过滤式特征排序与封装式特征选择的特点,改进已有方法中的前向搜索策略,设计了一种混合式K-匿名特征选择算法,使用分类性能作为评价准则选出分类性能最好的K-匿名特征子集。在多个公开数据集上进行实验,结果表明,所提算法在分类性能上可以超过现有算法并且信息损失更小。 相似文献
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228.
In a strip winding process, the sleeve is a hollow cylinder that is mounted between a strip coil and a man-drel to maintain uniform coil shape when the strip coil is very thin, but its deformation behavior has not been investigated before.Thus, a finite element (FE) model was presented to calculate the stress distribu-tion in a sleeve and strip coil when 1-3 mm-thick stainless steel was wound around the sleeve.The FE model was developed by extending a previous model by adding a sleeve between the mandrel and strip, and by modifying the boundary and interaction conditions.The strip winding process was divided into an initial process and a steady-state process.During the initial process, the minimum and maximum pressure re-quired on the belt wrapper to maintain coil shape by self-friction of the strip was calculated by the FE model when the belt wrapper is ejected at the end of the initial process.After the initial process, an ana-lytical model of the steady-state process was established to calculate the stress distribution and was com-pared with the FE model to validate it.The suggested analytical model took 1 1 s to give the same stress distribution that the FE model took 30 d to produce. 相似文献
229.
文章首先介绍了ITU-T G.709建议的数字包封的复用映射结构,然后详细描述了基于该建议的子速率透明复用器的设计框图,并详细论述了其设计优点,最后给出了其在系统传输时的误码率与光信噪比的关系曲线,验证了其前向纠错功能。 相似文献
230.
Sandeep Koranne 《Journal of Electronic Testing》2002,18(4-5):415-434
In this paper a mathematical formulation and an efficient solution, of the embedded core-based system-on-chip (SOC) test scheduling problem (ECTSP) is presented. The ECTSP can be stated as follows; given a chip with N
C cores each having a test T
i; where T
i takes time
to execute on a test access mechanism (TAM) of width w
j, and a constraint W on the number of top-level test pins; calculate the TAM assignment vector and the schedule for each test T
i, such that the completion time of the full chip test is minimized. All existing approaches have solved the ECTSP by solving the TAM partition and scheduling problem sequentially. In this paper we present an unified approach to solve the ECTSP. We present the first report of a design of reconfigurable core wrapper which allows for a dynamic change in the width of the test access mechanism (TAM) executing a core test. An automatic procedure for the creation of DfT hardware required for reconfiguration using a graph theoretic representation of core wrappers is also presented. For the case of reconfigurable wrappers, efficient algorithms to compute the schedule are presented based upon some recent results in the field of malleable task scheduling. Cases in which the degree of reconfigurability are constrained are considered; the case when only a single core can have reconfigurable wrapper, a schedule with zero TAM idle time can be found in time O(N
C(N
C + W)lgW), and the case when only 2 different wrapper configurations are allowed can be solved in time O(N
C
3). Comparison with existing results on benchmark SOCs show that our algorithms outperform state-of-art ILP formulations not only in schedule makespan, but also significantly reduce computation time. 相似文献