共查询到20条相似文献，搜索用时 593 毫秒
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阈值逻辑门是一种逻辑功能很强的逻辑电路，任意线性可分离函数只要用一个单阈值逻辑门便可予以实现，本文讨论与分析了阈函数、对称函数的有关性质，指出了任意对称函数可以方便地用具有多阈值、多输出的阈门及异或门予以实现，文中给出了相应的综合程序． 相似文献
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根据二变量基本对称函数产生器的逻辑功能，结合多β晶体管独特的结构特点，设计了元件级的二变量基本对称函数产生器，用该对称函数产生器可实现任意对称函数。 相似文献
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本文简要介绍了Orlicz空间理论的发展概况及对称Minkowski平面的相关性质,并给出了Orlicz空间称为对称Minkowski平面的一个充分条件。 相似文献
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<正>函数是中职数学教学的主线,也是中职数学教学内容的核心,更是整个中职数学的基础。函数的对称性是函数的一个基本性质,对称关系广泛存在于数学问题之中,利用对称性往往能更简捷地使问题得到解决。函数的性质是中职数学对口高考的重 相似文献
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部分Bent函数的几种构造方法 总被引：1，自引：0，他引：1
给出了部分Bent函数几种一般性构造方法,同时得到了由上述方法所构造出的部分Bent函数的Walsh循环谱特征.特别给出了由变元个数少的Bent函数构造变元个数多的部分Bent函数的一般方法,由此方法可构造出大量的部分Bent函数. 相似文献
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设Ω是实对称矩阵SRnxn中的一类线性流形,考虑问题Ⅰ:给定X∈Rnxm,B∈Rmxm求A∈Ω,使得f(A)=||XTAX-B||=min;问题Ⅱ:给定A*∈Rnxn,求(A)∈SE,使得||A*-(A)||= ||A-(A)||,SE是问题Ⅰ的解集.本文给出了问题Ⅰ、Ⅱ的解的通式,并给出了问题Ⅰ中f(A)=0成立的充分必要条件. 相似文献
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This work is devoted to the study of symmetric control systems. It establishes a relation between internal symmetry and external one for a linear invariant control system having n real simple poles. The symmetric stabilization problem is studied using a symmetric feedback gain such that the output control stabilizes the closed-loop system. A necessary and sufficient condition is given to solve this stabilization problem for a symmetric control system (A,B,C) and a generalized symmetric control system (E,A,B,C). 相似文献
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Bent 函数一直是密码学研究中的重要课题,如何判断给出的布尔函数是否为bent函数是必须要解决的问题.通过对Gold型函数中指数的分析,得到了Gold型函数成为bent函数的充要条件,此充要条件是Leander文献中定理的部分推广,用该结论判断bent函数更加简便.同时还讨论了多个迹函数之和成为bent函数的一个充要条件. 相似文献
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This paper deals with observer design and stability for a class of partial differential equation (PDE) systems governed by one-dimensional wave equations with mixed derivative terms and superlinear boundary conditions, whose dynamics exhibits chaos when the system parameters change within certain ranges. Firstly, a sufficient and necessary condition that guarantees the stability of this class of systems is obtained. Secondly, based on the method of characteristics, an observer is designed by injecting the measurement output estimation error on the boundary, and the observation error dynamics is proved to be stable with a necessary and sufficient criterion, which can identity the range of the feedback gain for the observer. Finally, two numerical examples are provided to illustrate the validity of the theoretical conclusions. 相似文献
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《Journal of The Franklin Institute》2021,358(16):8639-8655
Interconnection and damping assignment passivity-based control scheme has been used to stabilize many physical systems such as underactuated mechanical systems through total energy shaping. In this method, some partial differential equations (PDEs) related to kinetic and potential energy shaping shall be solved analytically. Finding a suitable desired inertia matrix as the solution of nonlinear PDEs relevant to kinetic energy shaping is a challenging problem. In this paper, a systematic approach to solving this matching equation for systems with one degree of underactuation is proposed. A special structure for desired inertia matrix is proposed to simplify the solution of the corresponding PDE. It is shown that the proposed method is more general than that of some reported methods in the literature. In order to derive a suitable desired inertia matrix, a necessary condition is also derived. The proposed method is applied to three examples, including pendubot, VTOL aircraft, and 2D SpiderCrane. 相似文献
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研究了知识链组织合作创新过程中信息对称和信息非对称条件下的最优激励契约。研究表明:信息对称条件下代理组织知识投入的努力程度更高,核心企业可以获得更高的收益。 相似文献
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Fei Chu Xiang Cheng Chuang Peng Runda Jia Tao Chen Qinglai Wei 《Journal of The Franklin Institute》2021,358(1):606-632
The advantages of maximally transferring similar process data for modeling make the process transfer model attract increasing attention in quality prediction and optimal control. Unfortunately, due to the difference between similar processes and the uncertainty of data-driven model, there are usually a more serious mismatch between the process transfer model and the actual process, which may result in the deterioration of process transfer model-based control strategies. In this research, a process transfer model based optimal compensation control strategy using just-in-time learning and trust region method is proposed to cope with this problem for batch processes. First, a novel JITL-JYKPLS (Just-in-time learning Joint-Y kernel partial least squares) model combining the JYKPLS (Joint-Y kernel partial least squares) process transfer model and just-in-time learning is proposed and employed to obtain the satisfactory approximation in a local region with the assistance of sufficient similar process data. Then, this paper integrates JITL-JYKPLS model with the trust region method to further compensate for the NCO (necessary condition of optimality) mismatch in the batch-to-batch optimization problem, and the problem of estimating experimental gradients is also avoided. Meanwhile, a more elaborate model update scheme is designed to supplement the lack of new data and gradually eliminate the adverse effects of partial differences between similar process production processes. Finally, the feasibility of the proposed optimal compensation control strategy is demonstrated through a simulated cobalt oxalate synthesis process. 相似文献
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Set stabilization of probabilistic Boolean control networks (PBCNs) is investigated in this paper and some interesting results are derived. The main results consist of three parts. (1) A definition of set stabilizability with probability one by closed-loop control is proposed for PBCNs, which is not a natural extension from deterministic Boolean control networks to PBCNs due to the random feature of PBCNs. (2) A necessary and sufficient set stabilizability condition is provided for PBCNs. (3) An algorithm for designing a state feedback controller is developed. It is guaranteed that all designed controllers can stabilize a PBCN to a given subset with probability one. The design method is constructive, so it is convenient to use this method in practical application. The results derived above are fundamental and important, since based on them many problems about PBCNs can be solved, for example partial stabilization, synchronization, and so on. Finally, a practical example is employed to show the effectiveness of our results. 相似文献
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Using the algebraic state space representation (ASSR) method, this paper investigates the set stability and synchronization of Boolean networks with probabilistic time delays (PTDs). Firstly, an equivalent stochastic system is established for the Boolean network with PTDs by using the ASSR method. Secondly, based on the probabilistic state transition matrix of equivalent stochastic system, a necessary and sufficient condition is proposed for the set stability of Boolean networks with PTDs. Thirdly, as an application of set stability, the synchronization of coupled Boolean networks with PTDs is studied, and a necessary and sufficient condition is presented. Finally, an illustrative example is given to demonstrate the effectiveness of the obtained new results. 相似文献
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《Journal of The Franklin Institute》2019,356(12):6460-6477
This paper studies the detectability problem of discrete event systems (DESs), and devotes to providing a synthetical method to cope with multiple cases, including (partial) event observation and/or partial state observation. By using the semi-tensor product method, two equivalent types of algebraic expressions are presented for DESs, based on which reachability of DESs is investigated in detail and a new tool called detection matrix is defined. Then, four matrix-based necessary and sufficient conditions are derived for checking different kinds of detectability. Finally, for better presentation, two examples are shown to demonstrate that the theoretical results are efficient. 相似文献
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实证方法在管理学科问题研究中的科学运用 总被引：3，自引：0，他引：3
李慧 《科学学与科学技术管理》2008,29(5):34-38
同其他学科一样,管理学科问题的研究和应用受到方法论的支配,有着自己的基本研究方法和研究思路.大量的实证研究是发展理论的必要条件,加强管理学科问题研究中实证方法的运用是提高管理研究成效的关键.针对现阶段实证方法在我国管理学科问题研究中存在的问题和研究者对实证论证方法的认识误区,提出了问题导向和环境依赖的实证研究方法以及基于问题导向和环境依赖的科学的研究思路. 相似文献