Stability analysis of discrete-time systems with actuator saturation by a saturation-dependent Lyapunov function

In this paper, stability of discrete-time linear systems subject to actuator saturation is analyzed using a saturation-dependent Lyapunov function. This saturation-dependent Lyapunov function captures the real-time information on the severity of actuator saturation and leads to less conservative estimate of the domain of attraction, which is based on the solution of an LMI optimization problem. Numerical examples are presented to show the effectiveness of the proposed method.     

Heterogeneous object modeling through direct face neighborhood alteration

Two recent advances—the use of functionally gradient materials in parts and layered manufacturing technology—have brought to the forefront the need for design and fabrication methodologies for heterogeneous objects. However, current solid modeling systems, a core component of computer-aided design and fabrication tools, are typically purely geometry based, and only after the modeling of product geometry, can a part's non-geometric attributes such as material composition be modeled. This sequential order of modeling leads to unnecessary operations and over-segmented 3D regions during heterogeneous object modeling processes.

To enable an efficient design of heterogeneous objects, we propose a novel method, direct face neighborhood operation. This approach combines the geometry and material decisions into a common computational framework as opposed to separate and sequential operations in existing modeling systems. We present theories and algorithms for direction face neighborhood alteration, which enables direct alteration of face neighborhood before 3D regions are formed. This alteration is based on set membership classification (SMC) and region material semantics. The SMC is computationally enhanced by the usage of topological characteristics of heterogeneous objects. After the SMC, boundary evaluation is performed according to the altered face neighborhood. In comparison with other solid modeling methods, the direct face neighborhood alteration method is computationally effective, allows direct B-Rep operations, and is efficient for persistent region naming. A prototype system has been implemented to validate the method and some examples are presented.     

迅速掌握8088/8086指令系统的教学方法

介绍了一种快速掌握汇编语言指令系统的方法,对学生学习汇编语言程序设计有一定的帮助。     

基于窄带水平集的曲线演化与左心室MRI图像分割

文章研究了基于窄带水平集的曲线演化方法并应用于心脏的MRI图像分割。分析了窄带的生成技术,提出了基于模板的距离函数生成方法;针对MRI图像的特点,给出了一种分割MRI图像的水平集速度函数,以处理图像中出现的区域灰度不一致性以及弱边界现象。MRI图像的分割实验证明了该文算法的有效性。     

一种基于Rough集的属性值约简算法

文章将Rough集理论应用于不同类型的决策表(一致决策表和不一致决策表)的约简,给出了广义决策、决策规则的一致程度、属性值重要性等定义,在此基础上提出了一种基于Rough集的属性值约简算法。该算法不仅能得到更为简洁的决策规则,而且能保持决策规则的一致程度不变。实例分析表明该算法是可行的。     

复合型智能预测分析系统框架研究

提出了多元支持向量机思想及其实现过程,并将其与粗糙集与神经网络相结合,提出一种复合型智能预测分析系统框架。首先利用粗糙集对预测的原始数据进行处理,并从中发现隐含知识,然后提出了多元支持向量机,能够有效地对两种以上类型的数据进行精确分类。将两者与神经网络有机地结合起来,构成一种复合型预测分析系统,从而为决策分析提供一种新的方法。     

JAVA新类库中Swing的事件传送机制

ＳＵＮ公司最新发布的一套ＡＰＩ中的Ｓｗｉｎｇ组件集采用了ＭＶＣ结构，其中Ｍ、Ｖ、Ｃ三者间的事件传送及与外界的通信机制相当重要。本文从Ｓｗｉｎｇ的组件如何响应外部事件、如何处理自身的变化及如何把自身变化传递给外界三个方面详细阐述Ｓｗｉｎｇ的事件传送机制。     

关于部分K值逻辑Sheffer函数(V)

根据部分多值逻辑的完备性理论[1]，本文证明了m=2时，关系图为对称H图的一类单纯可离函数集在Pk^*的准完备集之最小覆盖中必出现。     

时态信息系统转换方法的改进

利用Rough Set方法分析时间序列，已经取得了成果。时态信息系统(TIS)是时间序列的形式化表示。将时态信息系统转化为传统的信息系统(IS)，是将Rough Set方法应用于时间序列挖掘的基础。目前，已有的将TLS转换为IS的方法，依赖于固定的时间间隔，具有一定的局限性。本文在已有算法的基础上，提出了两种改进方法，并结合Rough Set理论，使之适用于一般的时间序列的挖掘。