盲信号分离的自稳定算法

在传统盲分离算法的迭代过程中，为了保证分离矩阵的行正交性，都要对其进行反复的正交化，以避免算法的不收敛。针对这个问题，笔者主要研究了在Stiefel Manifold上的盲分离算法，该算法使分离矩阵不需要每一步都进行正交化。仿真表明，本文提出的新算法具有很好的稳定性。     

单片机在交流电梯控制系统的应用

本文介绍使用单片机代替交流电梯控制系统中传统使用的继电器控制系统,实现了对层呼信号或指令信号登记、自动定时关门(门联锁)、自动检测定向、顺向载车、停站和自动开门……等十多种功能,提高了运行的平稳可靠、灵活、平层准确以及可调速度、方便维修保养等有关性能.     

基于DSP的变频调速控制系统设计

应用矢量控制的原理，以DSP为核心，开发出一套基于DSP的变频调速系统。对整个系统的硬件电路和驱动软件实现作了详细的介绍，实现对异步电机的控制，提高了能量的利用效率。     

The cold case: Are rhinoviruses perfectly adapted pathogens?

Rhinoviruses, which cause common cold, belong to the Picornaviridae family, small non-enveloped viruses (diameter 15-30 nm) containing a single-stranded RNA genome (about 7 kb). Over 100 different rhinoviral serotypes have been identified thus far, establishing rhinoviruses as the most diverse group of Picornaviridae. Based on receptor binding properties, rhinoviruses are divided into two classes: the major group binding to intracellular adhesion molecule-1 and the minor group binding to the very low density lipoprotein receptors. Interactions between virus and the receptor molecules cause a conformational change in the capsid, which is a prerequisite for viral uptake. Rhinoviruses trigger a chemokine response upon infection that may lead to exacerbation of the symptoms of common cold, i.e. asthma and inflammation. The following review aims to summarize the knowledge about rhinoviral infections and discusses therapeutical approaches against this almost perfectly adapted pathogen.     

驾驶员最优预见跟踪仿真研究

预见信息的加入能使驾驶员提前感知跟踪目标未来变化,从而对飞机做出超前控制。研究了驾驶员最优预见跟踪控制算法,理论分析得出预见信息对预见控制的作用特点。最后通过人机系统模拟实验,验证了预见信息对驾驶员超前补偿的特性。     

Family I.3 lipase: bacterial lipases secreted by the type I secretion system

Based on the classification of bacterial lipolytic enzymes, family I.3 lipase is a member of the large group of Gram-negative bacterial true lipases. This lipase family is distinguished from other families not only by the amino acid sequence, but also by the secretion mechanism. Lipases of family I.3 are secreted via the well-known type I secretion system. Like most of proteins secreted via this system, family I.3 lipases are composed of two domains with distinct yet related functions. Recent years have seen an increasing amount of research on this lipase family, in terms of isolation, secretion mechanism, as well as biochemical and biophysical studies. This review describes our current knowledge on the structure-function relationships of family I.3 lipase, with an emphasis on its secretion mechanism. Received 18 April 2006; received after revision 3 July 2006; accepted 24 August 2006     

一种改进的实信号IFFT算法

由于重量轻、体积小、功耗低、功能强的小卫星工作在无人干预的低温 ,高辐射的空间环境中 ,因此星上计算机系统必须满足集成度高、寿命长、可靠性高、抗辐射能力强的要求。针对立体测绘小卫星的特点 ,我们设计了满足上述要求的集集中控制与分布控制优点于一身的星上计算机系统 ,对其可靠性进行了分析 ,并对提高其可靠性应采取的关键技术进行了简要的论述。     

差分放大器的理论与实验教学研究

讨论了差分式放大器教学中的几个典型问题,包括电路图的规范问题、小信号等效电路以及实验教学中的几个难点.     

交通信号灯智能控制系统设计与实现

研究了运用PLC技术的交通信号控制系统，用简洁的软硬件使其智能化程度更高。采用PLC与计算机之间的通讯链接技术，完成交通对象的复杂控制。并运用模糊控制原理，将人的控制经验及推理过程纳入系统自动控制当中，使车辆行驶和道路导航实现智能化。