查询词典 matroid

The characterization of the access structures of ideal secret sharing schemes is one of the main open problems in secret sharing and has important connections with matroid theory.

一直以来，理想的存取结构具有的特性是秘密共享领域中主要的开放性问题之一，并且该问题与拟阵论有着密切的联系。

At the same time, they proved that a multipartite matroid is representable if and only if the corresponding discrete polymatroid is representable.

他们的工作具有令人振奋的结果：通过研究多部拟阵和离散多拟阵之间的关系，他们得到了多部存取结构为理想存取结构的一个必要条件和一个充分条件，并且证明了一个多部拟阵是可表示的当且仅当其对应的离散多拟阵是可表示的。

Through the investigation of the reconfiguration practice in a certain plant, the conclusion is attained that the greedy method based on matroid model is efficient and practicable.

针对某工厂的重组实践，经与现场结果对比证明，在快速重组制造系统的布局规划优化设计中，基于拟阵的贪馋算法是一种快捷实用的算法。

In this section, we also give a conjecture: A finite lattice is isomorphic to the lattice of flats of a finite poset matroid if and only if it is a semi-modular lattice.

本节的一个中心问题是提出了一个猜想：一个有限格L同构于一个有限偏序集拟阵的闭集所构成的格当且仅当L是一个半模格。

Given the assumption of analysis-of-variance model, the text selection can be transformed to a linear parameter estimation problem, which can then be solved by a greedy matroid cover algorithm.

在方差分析模型的假设下，最优文本选择就转化为线性参数估计问题，相当于寻找拟阵的最小代价覆盖集，从而可通过贪心算法求解。

We apply this general result to Vamos matroid and obtain a family of non-representable multipartite matroids.

我们将这一结论应用于Vamos拟阵，于是得到了一族不可表示的多部拟阵，同时我们利用向量的线性相关和线性无关性对Vamos拟阵的不可表示性给出了新的证明。

The optimal design of layout programming of RRMS is explored. The mathematical programming model based on matroid is established and the greedy method is selected serving as the optimal method. The application program based on this method is also developed and compiled.

摘 要：研究探索了快速可重组制造系统布局规划中的优化设计问题，建立了基于拟阵的数学规划模型，通过对比选取贪馋算法作为优化算法，并编制开发了此算法的应用程序。

A necessary and sufficient condition about the reducibility of central essential hyperplane arrangements is given:a central essential arrangement is irreducible if and only if the matroid is connected.

具体地，本文将对每一个超平面构形，构造一个拟阵，证明中心本质构形不可约的充分必要条件是对应的拟阵是连通的。

Graph theory s 02 graph theory widely used for its own development. 40-60 20th century era matroid theory and graph theory-very graph theory, algebra and graph theory. topology theory has great development.

详细说明：图论讲义02 图论的广泛应用，促进了它自身的发展。20世纪40-60年代，拟阵理论、超图理论、极图理论，以及代数图论、拓扑图论等都有很大的发展。

Second, by modifying the cost function in the matroid cover problem, we can further generalize the greedy optimal text selection so as to minimize the total number of phonemes in the training text.

其二，通过修正拟阵覆盖问题中代价函数的形式，可以进一步将最佳文本选择问题由追求最小句子数推广至使训练文本中音素总数最少。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。