A non-commutative time-frequency tomography

The characterization of non-stationary signal requires joint time and frequency information. However, time and frequency are a pair of non-commuting variables that cannot constitute a joint probability density in the time-frequency plane. The time-frequency distributions have difficult interpretation problems arising from negative and complex values or spurious components. In this paper, we get time-frequency information from the marginal distributions in rotated directions in the time-frequency plane. The rigorous probability interpretation of the marginal distributions is without any ambiguities. This time-frequency transformation is similar to the computerized axial tomography (CT or CAT) and is applied to signal analysis and signal detection and reveals a lot of advantages especially in the signal detection of the low signal/noise (S/N).     

浅谈路由器的瓶颈问题

本文阐述了网络互联设备路由器的瓶颈问题给网络传播带来的负担，基于路由器的特点提出了第三层交换技术，第三层交换技术不是网络交换机与路由器的简单叠加，而是二者的有机结合，形成一个集成的、完整的解决方案。     

机电一体化技术的现状和发展趋势

现代科学技术的不断发展,极大地推动了不同学科的交叉与渗透,导致了工程领域的技术革命与改造。在机械工程领域,由于微电子技术和计算机技术的迅速发展及其向机械工业的渗透所形成的机电一体化,使机械工业的技术结构、产品机构、功能与构成、生产方式及管理体系发生了巨大变化,使工业生产由“机械电气化”迈入了“机电一体化”为特征的发展阶段。     

ROLE OF α-PSEUDO-UNIVEX FUNCTIONS IN VECTOR VARIATIONAL-LIKE INEQUALITY PROBLEMS

In this paper, we introduce a new class of generalized convex function, namely, a-pseudounivex function, by combining the concepts of pseudo-univex and α-invex functions. Further, we establish some relationships between vector variational-like inequality problems and vector optimization problems under the assumptions of α-pseudo-univex functions. Results obtained in this paper present a refinement and improvement of previously known results.     

基于Unicode字符集的Windows编程

长期处于优势地位的ASCII字符所具有的先天弊端正制约着程序设计的发展，而Unicode要完全取代ASCII还需要一段很长的过程。本文从Unicode字符集角度出发，详细分析了windows编程环境中的宽字符操作方法，解决了常用的两种字符的兼容问题。     

全球变化背景下的几个科技名词

随着人们对全球变化（global change）的关注和研究，这一领域出现了很多科技名词，对这些名词进行统一定名、合理释义非常必要。文章结合国际上全球变化问题的研究进展分析了几个典型名词。     

文化式原型变化之比较

从立体构成形式、基本松量、胸省量、肩斜角、前后高度差、袖斜角、省道变化应用等方面，对新老版本文化式原型进行了对比分析。论证了新版文化式原型的科学性、合理性和实用性。     

日式经营管理在邃变

８０年代引人注目的日式经营管理，９０年代来其许多本质性特征却发生了意味深长的变化。注视并研究这些变化意义甚大。本文重在概括日式经营管理现正经历的变化。