基于DSP技术的RFID读写器设计

文中介绍了RFID系统及RFID读写器,论述了基于DSP技术的RFID读写器设计方法.在描述RFID系统组成的基础上,给出了读写器的软硬件设计流程.重点阐述了RFID读写器的防冲突设计.该读写器已应用于门禁系统中,实际应用结果表明其性能良好.     

2%CrMoNiWV高低压复合转子材料的研究

试验研究了2%CrMoNiWV高低压复合转子材料。试验件在950℃奥氏体化,高压区模拟直径1350mm,模拟喷雾冷速为2.5℃/min,回火温度为660～690℃;低压区模拟直径2500mm,模拟喷水冷速为3℃/min,回火温度为630～660℃。结果表明,综合力学性能达到了目标要求。     

岩体平巷充气降氡技术研究

提出了一种适用于破碎山体中平巷的降氡技术.该巷道中氡浓度受山体内空气渗流方向和强度的控制,渗流的机制是烟囱效应.由于山体内空气的温度基本恒定,因而密度不变,而巷道外空气密度随温度的变化而相应地变化着,这就导致了山体内外空气的失衡--夏季山体内含氡空气经裂缝流入巷道,冬季巷道外新鲜空气流入巷道后再经山体裂缝流向大气.实验表明,通过在巷道口部设置自动风门,向巷道内机械压风,形成充气状态,可以调节山体内空气的渗流方向,从而可以显著降低巷道内氡的浓度.     

Identification and Functional Analysis of the Caffeic Acid O-Methyltransferase (COMT) Gene Family in Rice (Oryza sativa L.)

Caffeic acid O-methyltransferase (COMT) is one of the core enzymes involved in lignin synthesis. However, there is no systematic study on the rice COMT gene family. We identified 33 COMT genes containing the methyltransferase-2 domain in the rice genome using bioinformatic methods and divided them into Group I (a and b) and Group II. Motifs, conserved domains, gene structure and SNPs density are related to the classification of OsCOMTs. The tandem phenomenon plays a key role in the expansion of OsCOMTs. The expression levels of fourteen and thirteen OsCOMTs increased or decreased under salt stress and drought stress, respectively. OsCOMTs showed higher expression levels in the stem. The lignin content of rice was measured in five stages; combined with the expression analysis of OsCOMTs and multiple sequence alignment, we found that OsCOMT8, OsCOMT9 and OsCOMT15 play a key role in the synthesis of lignin. Targeted miRNAs and gene ontology annotation revealed that OsCOMTs were involved in abiotic stress responses. Our study contributes to the analysis of the biological function of OsCOMTs, which may provide information for future rice breeding and editing of the rice genome.     

Known-key distinguishers on type-1 Feistel scheme and near-collision attacks on its hashing modes

We present some known-key distinguishers for a type-1 Feistel scheme with a permutation as the round function. To be more specific, the 29-round known-key truncated differential distinguishers are given for the 256-bit type-1 Feistel scheme with an SP (substitution-permutation) round function by using the rebound attack, where the S -boxes have perfect differential and linear properties and the linear diffusion layer has a maximum branch number. For two 128-bit versions, the distinguishers can be applied on 25-round structures. Based on these distinguishers, we construct near-collision attacks on these schemes with MMO (Matyas-Meyer-Oseas) and MP (Miyaguchi-Preneel) hashing modes, and propose the 26-round and 22-round near-collision attacks for two 256-bit schemes and two 128-bit schemes, respectively. We apply the near-collision attack on MAME and obtain a 26-round near-collision attack. Using the algebraic degree and some integral properties, we prove the correctness of the 31-round known-key integral distinguisher proposed by Sasaki et al. We show that if the round function is a permutation, the integral distinguisher is suitable for a type-1 Feistel scheme of any size.     

协同产品开发设计成熟度的模糊预测方法

CAD/CAPP/CAM并行是协同产品开发的关键技术之一,其在很大程度上依赖于设计成熟度的预先确定.论文在明确设计成熟度概念的基础上,分析了集成产品开发团队、硬件设施和时间等影响产品设计成熟度的因素,并通过建立递阶模糊质量屋的方法,提取构成成熟度因素集的产品特征,应用德尔菲法或AHP法配置成熟度因素集.在此基础上基于模糊设计理论,提出了多层次模糊计算模型作为成熟度的预测方法.通过应用该模糊预测方法计算某型号飞机机翼的设计成熟度,验证了方法的合理性和可用性.     

Improving bug management using correlations in crash reports

Nowadays, many software organizations rely on automatic problem reporting tools to collect crash reports directly from users’ environments. These crash reports are later grouped together into crash types. Usually, developers prioritize crash types based on the number of crash reports and file bug reports for the top crash types. Because a bug can trigger a crash in different usage scenarios, different crash types are sometimes related to the same bug. Two bugs are correlated when the occurrence of one bug causes the other bug to occur. We refer to a group of crash types related to identical or correlated bug reports, as a crash correlation group. In this paper, we propose five rules to identify correlated crash types automatically. We propose an algorithm to locate and rank buggy files using crash correlation groups. We also propose a method to identify duplicate and related bug reports. Through an empirical study on Firefox and Eclipse, we show that the first three rules can identify crash correlation groups using stack trace information, with a precision of 91 % and a recall of 87 % for Firefox and a precision of 76 % and a recall of 61 % for Eclipse. On the top three buggy file candidates, the proposed bug localization algorithm achieves a recall of 62 % and a precision of 42 % for Firefox, and a recall of 52 % and a precision of 50 % for Eclipse. On the top 10 buggy file candidates, the recall increases to 92 % for Firefox and 90 % for Eclipse. The proposed duplicate bug report identification method achieves a recall of 50 % and a precision of 55 % on Firefox, and a recall of 47 % and a precision of 35 % on Eclipse. Developers can combine the proposed crash correlation rules with the new bug localization algorithm to identify and fix correlated crash types all together. Triagers can use the duplicate bug report identification method to reduce their workload by filtering duplicate bug reports automatically.     

类别不平衡的分类方法及在生物信息学中的应用

提出一种处理正反例不平衡的分类方法,以解决生物信息学中的snoRNA识别、microRNA前体判别、SNP位点的真伪识别等问题. 利用集成学习的思想,将反例集均匀分割并依次与正例集组合,得到一组类别平衡的训练集.然后对每个训练集采用不同原理的分类器进行训练,最后投票表决待测样本.为了避免弱分类器影响投票效果,结合AdaBoost思想,将每个分类器训练中产生的错误样本加入到下2个分类器的训练集中,既避免了AdaBoost的反复训练,又有效地利用投票机制遏制了弱分类器的影响.5组UCI测试数据和3组生物信息学实验证明了它在处理类别不平衡分类问题时的优越性.     

一类新的V描述子在形状识别中的应用

提出了一类新的V描述子,对二维图形进行V变换提取形状信息,并定义归一化后的变换系数为描述子,其具有旋转、平移、缩放不变性,通过形状主方向在一定程度上消除了起始点的影响.通过快速V变换可以有效地计算出V描述子,该识别算法采用加权欧氏距离,并充分利用了V描述子的多分辨率分析特性,对轻微遮挡具有一定的抵抗力,可以根据实际情况达到较好的识别.     

基于平衡多小波的视频水印算法

提出一种基于平衡多小波的鲁棒水印算法.水印根据平衡多小波系数的特点嵌入在低频子带系数中,并利用人类视觉系统的特性,根据视频帧的运动检测和纹理复杂度调整水印信息的嵌入策略.实验结果表明,该算法在满足不可见的前提下,对多种攻击,如加性高斯噪声、有损压缩、时域抽样具有很好的鲁棒性.