Review of public-key cryptosystem based on the error correcting code

The paper review the public-key cryptosystems based on the error correcting codes such as Goppa code, BCH code, RS code, rank distance code, algebraic geometric code as well as LDPC code, and made the comparative analyses of the merits and drawbacks of them. The cryptosystem based on Goppa code has high security, but can be achieved poor. The cryptosystems based on other error correcting codes have higher performance than Goppa code. But there are still some disadvantages to solve. At last, the paper produce an assumption of the Niederreiter cascade combination cryptosystem based on double public-keys under complex circumstances, which has higher performance and security than the traditional cryptosystems.     

基于均匀设计的海峡两岸高层建筑顺风向风荷载多因素分析

为明确海峡两岸高层建筑顺风向风荷载的异同,对两岸建筑风荷载标准进行了对标分析,并采用均匀设计方法进行了高层建筑顺风向风荷载多因素分析。研究表明:两岸风荷载标准中基本风速取样方法和极值分布参数取值方法存在明显区别,风压高度变化系数分布和不同重现期的设计风速转换系数大致相同,台湾标准给出的湍流强度建议值明显大于大陆标准;台湾标准分类计算建筑物主体和围护结构的设计风压,大陆标准采用统一表达式,两者给出的设计风荷载组合方式区别明显;以基底剪力和基底弯矩作为评价指标,H/(BL)(1/2)(高宽比)、α地面粗糙度指数)、C_g(脉动效应系数)、C_p(风荷载体型系数)和I_z(湍流强度),对高层建筑顺风向风荷载的影响程度依次减小,H/(BL)(1/2)和α为主要影响因素;随H/(BL)(1/2)的增大,C_g对顺风向风荷载的影响逐渐增强,当H/(BL)(1/2)增大到一定程度时,C_g成为主导因素。     

高温时H13钢中初生碳氮化物的分解研究

利用光学显微镜、扫描电镜和电子探针研究了H13钢中初生碳氮化物高温分解时的形貌、尺寸、成分变化规律.原始初生碳氮化物主要为10~30μm的长条状(Vx,Mo1-x)(Cy,N1-y)及少量方形的(Tix,V1-x)(Cy,N1-y).在1200℃保温2.5 h后碳氮化物边缘变为凹凸不平的锯齿状,然后形成细小的分解颗粒,10 h后碳氮化物平均长度减小为12.9μm,主要为(Tix,V1-x)(Cy,N1-y).当经过1250℃ ×5 h保温后87%的碳氮化物发生分解,(Vx,Mo1-x)(Cy,N1-y)溶解消失,碳氮化物长度在20μm以下,当保温时间延长到10 h后碳氮化物长度均在10μm以下,70%为方形并且93%分解形成细小颗粒,未分解的碳氮化物为(Tix,V1-x)(Cy,N1-y).电子探针分析(Tix,V1-x)(Cy,N1-y)的分解与Fe元素扩散有关,高温时Fe在(Tix,V1-x)(Cy,N1-y)中含量逐渐增加而Ti、V减少,优先在边部曲率半径较小部位或缺陷处分解,形成0.1~1μm的细小分解颗粒,并由外向内以区域溶解方式使原始碳氮化物逐渐消失.双亚点阵模型分析两种碳氮化物的平衡溶解温度和组成有关,试样中大部分(Tix,V1-x)(Cy,N1-y)平衡溶解温度在1200~1246℃之间,与实验吻合较好.     

A high-level synthesis based dual-module redundancy with multi-residue detection （DMR-MRD） fault-tolerant method for on-board processing satellite communication systems

On board processing （OBP） satellite systems have obtained more and more attentions in recent years because of their high efficiency and performance.However,the OBP transponders are very sensitive to the high energy particles in the space radiation environments.Single event upset （SEU） is one of the major radiation effects,which influences the satellite reliability greatly.Triple modular redundancy （TMR） is a classic and efficient method to mask SEUs.However,TMR uses three identical modules and a comparison logic,the circuit size becomes unacceptable,especially in the resource limited environments such as OBP systems.Considering that,a new SEU-tolerant method based on residue code and high-level synthesis （HLS） is proposed,and the new method is applied to FIR filters,which are typical structures in the OBP systems.The simulation results show that,for an applicable HLS scheduling scheme,area reduction can be reduced by 48.26％ compared to TMR,while fault missing rate is 0.15％.     

由"二维码"英译引发的对术语翻译的思考

首先搜集“二维码”的多种英文表达,从而引出该概念的乱象,接着采用定性的分析方法,从该概念的内涵和外延、属和种差等多角度进行深度解剖,发现日常生活中接触得最多的英文表达“QR code”只是“二维码”的一种,并非其准确译法,据此总结“二维码”术语英译的困难以及从中发现术语标准存在的问题,并讨论术语翻译在生活中的应用特点。     

浅析嵇康“越名教而任自然”的道德意蕴

嵇康是魏晋时期著名的思想家之一。在司马氏利用名教控制天下的情况下，嵇康提出“越名教而任自然”的主张来反对虚伪名教的束缚，提倡个性解放，主张万物要遵循自然规律与法则，顺应其自然本性发展。实际上嵇康并不是反对一切道德和名教，而是通过“任自然”来回归到原初时代。顺应自然和人之性情的名教，是要超越现在而回归过去无欲、无贪的状态。     

基于沉积数值模拟的辫状河心滩演化

选取黄骅坳陷新近系典型辫状河沉积解剖区,利用密井网区动静态资料相结合识别和刻画心滩及其内部结构,在此基础上通过沉积数值模拟探究研究区心滩形成过程,并建立研究区心滩顺流迁移和横向迁移演化模式。结果表明:顺流加积、垂向加积、侧向加积和侵蚀作用共同塑造心滩的形态和内部结构;滩头侵蚀、滩尾顺流加积和垂向加积形成了心滩的顺流生长和垂向生长;侧向加积与侵蚀作用控制心滩的不对称侧向生长过程。     

Benthic foraminiferal δ~(13)C minimum events in the southeastern Okhotsk Sea over the last 180 ka

A total of six d13C minimum events,i.e.,VI,V,IV,III,II,and I,were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina spp.in gravity core OS03-1 in the southeastern Okhotsk Sea over the last 180 ka.These events occurred at112–109,102–90,85–76,57–54,44–40,and 17–10 ka BP.The largest negative excursions reached 2.5%in event V and were greater than 1%in the other events.We proposed that all d13C minimum events were caused by the increase in sea surface water productivity,the weakened formation of Okhotsk Sea intermediate water,and the enhancement of the oxygen minimum zone.The negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.     

（1-uv）-CONSTACYCLIC CODES OVER Fp＋uFp＋vFp＋uvFp

Constacyclic codes are an important class of linear codes in coding theory.Many optimal linear codes are directly derived from constacyclic codes.In this paper,（1 — uv）-constacyclic codes over the local ring Fp ＋ uFp ＋ vFp ＋ uvFp are studied.It is proved that the image of a（1 — uv）-constacyclic code of length n over Fp ＋ uFp ＋ vFp ＋ uvFp under a Gray map is a distance invariant quasi-cyclic code of index p2 and length p3n over Fp.Several examples of optimal linear codes over Fp from（1 — uv）-constacyclic codes over Fp ＋ uFp ＋ vFp ＋ uvFp are given.     

如何应用手机二维码提升图书馆服务水平

在概述手机二维码的概念与特点的基础上，着重介绍了二维码在资源定位、OPAC信息检索、链接门户网站、服务引导、身份认证、信息查询等方面的应用，探讨了手机二维码应用于图书馆的优势及做法。