首次积分与极限集的关系

利用奇点和有限集的特征，给出了首次积分存在的某些条件，首次积分可用来判别奇点，在各种奇点分布的情况下，利用向量场同胚映射证明了非奇点极限集的存在性。     

Probability output of multi-class support vector machines

A novel approach to interpret the outputs of multi-class support vector machines is proposed in this paper. Using the geometrical interpretation of the classifying heperplane and the distance of the pattern from the hyperplane, one can calculate the posterior probability in binary classification case. This paper focuses on the probability output in multi-class phase where both the one-against-one and one-against-rest strategies are considered. Experiment on the speaker verification showed that this method has high performance.     

相似变换下的几何图形

用代数方法解决几何问题并对几何图形中的中心，相似等概念作了部分推广，给出一个变换与图形相似间的等价关系。     

普里戈金时间观念探析

准确地理解时间，把握时间的本质，是当今科学哲学的一大基本问题。普里戈金的时间观念认为，宏观世界的时间存在具有方向性，是单向的、不可逆的。把握其关于时间之矢和可逆与不可逆之间对立统一的本质，具有一定的历史意义与现实启发价值。     

关于复波矢问题的讨论

对导电介质中复波矢k的β与α方向问题，以及衰减常数α与相位常数β的取值问题作一全面的讨论。     

三种方法的NP识别比较实验研究

利用错误驱动法、支持向量机法和隐马尔可模型三种方法对汉语文本进行名词短语识别,对实验进行比较分析,结果表明SVM与HMM的识别效果总体上要好于错误驱动法,HMM法在封闭测试中优势明显.研究表明错误驱动法应用于解决从语料库中学习转换规则的传统问题;SVM方法适用于解决两类别的分类问题;而HMM方法侧重应用在与线性序列相关的现象上.     

三相ZVS逆变器磁链轨迹

ZVS（zero voltage switching） PWM（pulse width modulation） inverters have attracted much attention recently. The basic idea is to use ZVS circuit as the main circuit of inverter resonance at the beginning of every carrier period so that each power device can commutate when voltage of the main circuit＇s DC bus line is zero. To ensure the resonant circuit to operate properly, sawtooth with alternate slope （positive or negative） is used as carrier. But the time of zero voltage vectors with such PWM pattern is greatly different from traditional hard-switching PWM pattern. This paper discusses the locus of flux linkage under soft-switching PWM pattern by using space voltage vector. It is pointed out that, under the hard-switching PWM pattern, speed of flux linkage is adjusted by zero space voltage vector. When soft-switching PWM pattern is used, however, effective time of space voltage vector varies considerably, sometimes even without zero space voltage vector. Therefore non-zero space voltage vector has been used to make the speed of flux linkage locus equal to that of hard-switching PWM pattern. The cause of current distortion in soft-switching PWM inverters is also discussed. Based on the flux linkage locus circle, corresponding compensation methods are proposed. Experimental results show that the described method can effectively improve output current waveform of inverter.     

高等数学在解中学数学题中的应用

高等师范院校数学系科的毕业生,应用概率论,高等几何,矢量协作及微积分等所学的高等数学知识来解中学数学题,可以取得良好效果。     

大系统的部分联结一致渐近稳定性及指数稳定性

基于子系统间某些关联可能是固定的情况,本文讨论了大系统的部分联结稳定性,并且利用向量李雅普诺夫函数法研究了大系统的部分联结一致渐近稳定性及指数稳定性,推广了大系统关联稳定性的相关结论。     

向量空间的拟线性变换

探讨了数域F上向量空间V的拟线性变换的存在性和变换、拟线性变换、线性变换之间的关系,并且研究了用（拟)线性变换的运算如何确定一个变换是（拟）线性变换的问题。