一种优于TM5的比特分配和量化控制算法

通过对传统TM5（test model 5）算法的分析，对TM5比特分配和量化控制进行了改进，提出了两种新方法，前者对输出视频序列信噪比（PSNR）的提高有明显的作用，并且可以平滑视频序列中各图像的均方误差（MSE）；后者提出滑窗的概念，对恒码率编码（CBR）的GOP的大小进行改变，使其配合前者，从而达到更好的视频编码效果。     

一种采用并行光强度调制器的模数转换方法

提出了一种采用并行光强度调制器实现移相光量化的方法。利用对光强度的衰减实现量化曲线的相移,解决了现有移相光量化方案中相位调制器对环境、温度较为敏感,量化曲线相移控制精度以及脉冲走离的问题。采用两个铌酸锂强度调制器并行连接,每个光耦合器分成4个通道,每个通道中插入光衰减器,通过调节光衰减器实现通道间调制曲线的相移,构成8通道4 bits的光量化器。实验中对10 GHz的正弦信号进行了光量化测试,量化结果的有效比特数(ENOB)为3.7 bits,仅低于理想分辨率0.3 bits。实验结果表明该方案可行,与一般移相光量化方案相比,具有较高的有效比特数。     

Investigation on the origin of the anomalous tail bits on nitrided charge trap flash memory

In this work, the origin of the anomalous tail bits have been examined thoroughly on 43 nm nitride based charge trap flash memory devices. Tunnel oxide nitridation was implemented on the device under study to enhance its immunity to charge loss mechanism. Due to the extensive program/erase cycling, the increment in the defect density in tunnel oxide layer has generated significant tail bits that exhibited detrimental charge loss at room temperature. The findings have indicated that these tail bits are attributed to randomly distributed defects due to extensive program/erase cycling stress. Furthermore, these tail bits enhanced with longer storage duration at room temperature but deterred at high storage temperature. In this work, the anomalous tail bits were suppressed at high storage temperature. The underlying physical mechanism for these anomalous tail bits was found to be attributed to trap-assisted-tunneling mechanism that enables trapped charges from nitride storage layer to leak out along the vertical path of oxide–nitride–oxide stack of nitrided flash memory. These findings have implied that the anomalous tail bits are one of the critical reliability concerns that need to be addressed to achieve desired reliability performance. This work also demonstrated that room temperature storage test is a critical test to investigate the generation of the detrimental anomalous tail bits in reliability characterization and qualification for future nitrided flash memory.     

真彩色图像隐藏与恢复

基于信息隐藏技术和图像处理技术，提出了一种24位真彩色图像隐藏与恢复的技术，该技术将一幅待保密的24位真彩色图像隐藏到另一幅任意选取的足够大，可以公开的24位真彩色图像中，而且根据所生成的图像和选择载体图像还可无失真地恢复出原保密图像。     

Recovery of correlated row sparse signals using smoothed L0-norm algorithm

Distributed compressed sensing(DCS) is an emerging research field which exploits both intra-signal and inter-signal correlations.This paper focuses on the recovery of the sparse signals which can be modeled as joint sparsity model(JSM) 2 with different nonzero coefficients in the same location set.Smoothed L0 norm algorithm is utilized to convert a non-convex and intractable mixed L2,0 norm optimization problem into a solvable one.Compared with a series of single-measurement-vector problems,the proposed approach can obtain a better reconstruction performance by exploiting the inter-signal correlations.Simulation results show that our algorithm outperforms L1,1 norm optimization for both noiseless and noisy cases and is more robust against thermal noise compared with L1,2 recovery.Besides,with the help of the core concept of modified compressed sensing(CS) that utilizes partial known support as side information,we also extend this algorithm to decode correlated row sparse signals generated following JSM 1.     

Analysis of Diquat by Ion Selective Elecrodes

Abstract

The calibration response of a diquat bis(tetra-4-chlorophenylborate) (DQT. 2T4C1PB) based ISE for DQT was stable for 55 days. The ISE calibration slope and minimum detectable activity a(min) of DQT were in the ranges (S.D. in parentheses) 30(0.6) to 28(1.7) mV/log a (DQT) and 4(3) × 10^?9M to 3(0.2) × 10^?6M, respectively.

The times for 100% response were 3 s at 1 mM and 25 s at 1 μM and the ISE was useable at pH 2 to 12 and over a sample temperature range of 2 to 50[ddot]C.

Samples (2.54–244 μM DQT) could be determined using the standard addition method with about a ?5% error and a precision of 7 to 8%. For comparison, DQT was also determined by titration with sodium tetraphenylborate (NaTPB) using DQT. 2TPB and TBA. TPB ISEs as TPB sensors. The errors were in the range of 12 to 20% for DQT analysis in deionized water, sodium chloride solution or simulated serum.     

衰落信道下基于簇的协作频谱感知分析

在分布式协作频谱感知网络中,认知用户向融合中心上报本地检测的信道是带宽受限的,并且受各种衰落的影响。分析了衰落信道下认知用户通过"与"规则进行融合的协作感知策略,提出了认知用户间为Nakagami信道时基于簇理论的协作感知方案,推导得出了2种方法的检测概率和归一化平均感知比特数。仿真结果表明,基于簇理论的协作感知通过牺牲一定的信令开销得到较好的感知性能。     

A Chemometric Analysis of Compounds from Native New Zealand Medicinal Flora

Several hundred (396) compounds from New Zealand flora with medicinal properties were analyzed for their physicochemical properties. It was found that approximately 10 % fulfilled all the requirements to be considered to be lead‐like, over half of the compounds were deemed to be in the drug‐like space and ≈75 % were in the known drug space. These results indicate the presence of a significant proportion of compounds that are of particular interest to pursue as potential lead compounds or therapeutics. Additionally, compound classes were analyzed separately—most carbonyl‐containing compounds (aldehydes, ketones, esters and lactones), along with phenols were the most lead‐like compounds, which also displayed very good proportions in the drug‐like and known drug space. The information presented herein can be harnessed and utilized in future work, through focussing on the compounds and compound classes that exhibit high‐levels of lead‐likeness for further development.     

一种超小型AES专用处理器的FPGA实现

提出一种基于FPGA的专用处理器设计.它是用于高级加密标准的超小面积设计,支持密钥扩展(现在设计为128位密钥),加密和解密.这个设计采用了完全的8位数据路径宽度,创新的字节替换电路和乘累加器结构,在最小规模的Xilinx Spartan II FPGA芯片XC2S15上实现了一个高级加密标准AES的专用处理器,使用了不到60%的资源.当时钟为70MHz时,可以达到平均加密解密吞吐量2.1Mb/s.主要应用在把低资源占用,低功耗作优先考虑的场合.