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71.
纳秒量级门控积分器的初步研究 总被引:1,自引:0,他引:1
在ICF软X射线能量测量时,需要对纳秒量级的脉冲信号积分,但是脉冲信号后伴随其他信号,而目前的线性开关电路或门控积分器又无法在纳秒量级内将脉冲信号后的部分切除,本文介绍了一种新型的纳秒量级门控积分器,能够实现纳秒量级的门控积分。 相似文献
72.
李永洁 《华中科技大学学报(城市科学版)》1993,(Z2)
本文递归地定义了连通图的临界度,并证明了几个定理,揭示了连通图临界度的特殊性质,说明所给出的递归定义与常规定义之间的关系. 相似文献
73.
The paper focuses on methods for injecting prior knowledge into adaptive recurrent networks for sequence processing. In order to increase the flexibility needed for specifying partially known rules, a nondeterministic approach for modelling domain knowledge is proposed. The algorithms presented in the paper allow time-warping nondeterministic automata to be mapped into recurrent architectures with first-order connections. These kinds of automata are suitable for modeling temporal scale distortions in data such as acoustic sequences occurring in problems of speech recognition. The algorithms output a recurrent architecture and a feasible region in the connection weight space. It is demonstrated that, as long as the weights are constrained into the feasible region, the nondeterministic rules introduced using prior knowledge are not destroyed by learning. The paper focuses primarily on architectural issues, but the proposed method allows the connection weights to be subsequently tuned to adapt the behavior of the network to data. 相似文献
74.
针对主成分分析和反馈神经网络的优点,提出基于主成分分析的输出集成反馈网络建模方法,并对训练算法作了推导,在动态化工过程建模中取得满意的效果。 相似文献
75.
V. V. Toporkov 《Cybernetics and Systems Analysis》2004,40(3):451-459
Recurrent schemes for generating alternatives of systems by given scalable operational models are proposed and substantiated. Recurrent schemes represent tools for generating alternatives based on structural and parametric transformations of operational models. Existence conditions for the solution to the generation and choice problem and the convergence of the recurrent scheme are analyzed and model examples are discussed. 相似文献
76.
Stefan L. Frank 《连接科学》2006,18(3):287-302
Connectionist models of sentence processing must learn to behave systematically by generalizing from a small training set. To what extent recurrent neural networks manage this generalization task is investigated. In contrast to Van der Velde et al. (Connection Sci., 16, pp. 21–46, 2004), it is found that simple recurrent networks do show so-called weak combinatorial systematicity, although their performance remains limited. It is argued that these limitations arise from overfitting in large networks. Generalization can be improved by increasing the size of the recurrent layer without training its connections, thereby combining a large short-term memory with a small long-term memory capacity. Performance can be improved further by increasing the number of word types in the training set. 相似文献
77.
More than 15 years ago, survival or hazard regression analyses were introduced to psychology (W. Gardner & W. A. Griffin, 1989; W. A. Griffin & W. Gardner, 1989) as powerful methodological tools for studying real time social interaction processes among dyads. Almost no additional published applications have appeared, although such data are commonly collected and the applicable questions are central to many important theoretical perspectives. To revisit the basic methods, the authors use an example from emotion regulation theory in which the level of child antisocial behavior is hypothesized to be positively associated with the hazard rate of angry emotions and negatively associated with sad, fearful emotions in the face of parental negative behavior (scolding). The authors discuss the limitations of traditional approaches to the analysis of social interaction and demonstrate improvements in the ability to model individual differences now available in existing software. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Design and Implementation of a Flexible Manufacturing Control System Using Neural Network 总被引:1,自引:0,他引:1
Magdy M. Abdelhameed Farid A. Tolbah 《International Journal of Flexible Manufacturing Systems》2002,14(3):263-279
Design and implementation of a sequential controller based on the concept of artificial neural networks for a flexible manufacturing system are presented. The recurrent neural network (RNN) type is used for such a purpose. Contrary to the programmable controller, an RNN-based sequential controller is based on a definite mathematical model rather than depending on experience and trial and error techniques. The proposed controller is also more flexible because it is not limited by the restrictions of the finite state automata theory. Adequate guidelines of how to construct an RNN-based sequential controller are presented. These guidelines are applied to different case studies. The proposed controller is tested by simulations and real-time experiments. These tests prove the successfulness of the proposed controller performances. Theoretical as well as experimental results are presented and discussed indicating that the proposed design procedure using Elman's RNN can be effective in designing a sequential controller for event-based type manufacturing systems. In addition, the simulation results assure the effectiveness of the proposed controller to outperform the effect of noisy inputs. 相似文献