大功率速调管的技术现状和研究进展

本文介绍了大功率速调管的技术现状、发展动态和应用情况,介绍了我国在该领域开展的主要研究工作和取得的主要研究进展,并对速调管技术的发展进行了展望。     

Fuzzy local Gaussian mixture model for brain MR image segmentation

Accurate brain tissue segmentation from magnetic resonance (MR) images is an essential step in quantitative brain image analysis. However, due to the existence of noise and intensity inhomogeneity in brain MR images, many segmentation algorithms suffer from limited accuracy. In this paper, we assume that the local image data within each voxel's neighborhood satisfy the Gaussian mixture model (GMM), and thus propose the fuzzy local GMM (FLGMM) algorithm for automated brain MR image segmentation. This algorithm estimates the segmentation result that maximizes the posterior probability by minimizing an objective energy function, in which a truncated Gaussian kernel function is used to impose the spatial constraint and fuzzy memberships are employed to balance the contribution of each GMM. We compared our algorithm to state-of-the-art segmentation approaches in both synthetic and clinical data. Our results show that the proposed algorithm can largely overcome the difficulties raised by noise, low contrast, and bias field, and substantially improve the accuracy of brain MR image segmentation.     

基于IGBT的直流充电机装置设计

基于目前电动汽车大功率充电装置的需求,提出了一种基于IGBT器件的直流充电机充电装置设计方案,并完成系统的软硬件设计。该系统的硬件部分架构设计主要是主回路部分以及控制系统部分,软件部分采用C语言进行编程,能够完成对其输出电压电流等信号的检测。实际应用表明,该系统达到了设计要求。     

RICB：基于缓冲区溢出的整数溢出漏洞动态分析

Integer overflow vulnerability will cause buffer overflow. The research on the relationship between them will help us to detect integer overflow vulnerability. We present a dynamic analysis methods RICB (Run-time Integer Checking via Buffer overflow). Our approach includes decompile execute file to assembly language; debug the execute file step into and step out; locate the overflow points and checking buffer overflow caused by integer overflow. We have implemented our approach in three buffer overflow types: format string overflow, stack overflow and heap overflow. Experiments results show that our approach is effective and efficient. We have detected more than 5 known integer overflow vulnerabilities via buffer overflow.     

A 1-V, 82-dB, 2.5-MS/s,single loop,single bit delta-sigma modulator in 0.13-μm CMOS technology

It is challenging to design high speed Delta-Sigma modulator using sub-micron process with low supply voltage. Compared with multi-stage or multi-bit design, the single loop, single bit Delta-Sigma modulator has relaxed requirement for the building blocks under low-voltage operation, which make it possible to get high conversion rate by increasing sampling frequency. In this study, a low voltage, high speed 4th-order Delta-Sigma modulator using input feed-forward is presented. Implemented with 0.13-μm CMOS technology and 1.0-V supply voltage, the discrete-time Delta-Sigma modulator achieves 2.5-MS/s conversion rate and 82-dB dynamic range, with the sampling frequency of 160-MHz and OSR of 64.     

TFO、TrFO技术应用研究

本文从网络现状入手,选择实际的网络开启TFO、TrFO功能,并进行测试、统计与分析,通过主观评估和客观评估两种方式评估了在现网情况下开启TFO、TrFO后的话音质量实际改善程度,确定了在A口尚未IP化的现阶段引入实施TFO、TrFO技术的方式和可行性.     

浅谈高能量NiMH电池

为了解NiMH电池的工作特性，评价其在电动车辆上的使用性能，对NiMH电池进行了充电试验测试。基于实验结果，给出了NiMH电池的工作电压、工作电压下降率和温升等特性曲，并对这些特性进行了详细的研究和分析，同时也对NiMH电池单体在充放电过程中的一致性行了分析评价。摘．放线进     

TFT-LCD阵列穿透率提升的研究

提高薄膜晶体管液晶显示器阵列基板的光利用效率的主要方法是提高开口率和穿透率。文章制作了低温多晶硅阵列穿透区多层膜,考察膜层以及结构对穿透率的影响,研究阵列光线穿透率提升的方法。结果表明,层间介质层（ILD）完成后不同折射率膜层接口对穿透率影响较大,平坦层（PL）的厚度对穿透率没有明显影响,导电膜氧化铟锡（ITO）厚度增加,穿透率下降。通过在阵列穿透区减少膜层数量和改变膜层组分,减少折射率差异较大的界面,可增加穿透率7%左右。     

Al2O3陶瓷表面的准分子激光活化沉积金属Cu技术

本文研究了通过ＸｅＣｌ准分子激光照射Ａｌ２Ｏ３陶瓷表面后,使其表面沉积金属Ｃｕ的技术,实验结果表明,Ａｌ２Ｏ３试样浸入Ｃｕ２ＳＯ４溶液后,金属Ｃｕ膜只沉积于激光照射区。经准分子激光照射,Ａｌ２Ｏ３表面结构的变化和Ａｌ富集区的产生是金属Ｃｕ沉积的主要原因。     

晶体硅太阳能电池激光精细加工技术研究

为提高晶体硅太阳能电池的转换效率,采用532 nm与355 nm纳秒激光器及10.6 μm射频二氧化碳激光器对晶体硅太阳能电池的绒面制作、边缘隔离工艺以及电池前电极激光制作进行了实验研究,获得了相关的工艺参数.