由于小波变换技术在20世纪90年代初期已经比较成熟，因此从那时起就开始出现各种新 颖的小波图像编码方法。这些编码方法包括EZW, 在EZW算法基础上改进的SPIHT和EBCOT 等。由于EZW算法的开拓给后来者带来很大的启发，它是一种有效而且计算简单的图像压缩 技术，因此本章将重点介绍

第4章存储体系 一、主要内容包括: 二、几种常用的内存管理方法(分区、分页、分段) 三、内存的分配和释放算法(最先适应、最佳适应、最坏适应、临近适应) 四、虚拟存储器的概念(部分装入) 五、控制主存和外存之间的数据流动方法 六、地址变换技术和内存数据保护与共享技术等 七、Windows22000/xp内存管理

Rectifier Diode: Current vs Mounting area

MITSUBISHI FAST RECOVERY DIODE MODULE RM400DY665 HIGH POWER SWITCHING USE HVDi(High Voltage Diode) Module INSULATED TYPE

Patented free-floating silicon technology Low on-state and switching losses Optimized for use as freewheeling diode in GTo converters Standard press-pack housing, hermetically cold-welded Cosmic radiation withstand rating

External dimensions(Unit: mm) High frequency rectification （1)Small power mold type(PMDS) （2) Ultra low VF （3)Very fast recovery

Direct fiber optic controll and status Fast response(tdon 3 FS, doff <6 Hs) Precise timing Patented free-floating silicon technology High reliability Very high EMI immunity

Oxide Oxide Metallization Contact processing techniques that are similar to those of today's VLSI circuits, although the device geometry, voltage and current ntSource

TOSHIBA Semiconductor Company Discrete semiconductor Division 2003 Dec DP054001101

Introduction to Insulated Gate Bipolar Transistors Prepared by: Jack Takesuye and scott Deuty Motorola inc INTRODUCTION As power conversion relies more on switched applications The IGBT is, in fact, a spin-off from power MOSFET