基于tPUF的物联网设备安全接入方案

针对现有的物联网设备安全接入方案不适用于资源受限的物联网设备的问题,提出一种基于tPUF的物联网设备安全接入方案。利用物理不可克隆函数技术（Physical Unclonable Function,PUF）,物联网设备不需要存储任何秘密信息,实现设备与认证端的双向认证以及协商会话秘钥;利用可信网络连接技术（Trusted Network Connect,TNC）,完成认证端对物联网设备的身份认证、平台身份认证、完整性认证。安全性分析表明,方案能够有效抵抗篡改、复制、物理攻击等。实验结果表明,相较于其他方案,该方案明显降低了设备的资源开销。     

Protein interaction networks: centrality,modularity, dynamics,and applications

In the post-genomic era, proteomics has achieved significant theoretical and practical advances with the development of high-throughput technologies. Especially the rapid accumulation of protein-protein interactions (PPIs) provides a foundation for constructing protein interaction networks (PINs), which can furnish a new perspective for understanding cellular organizations, processes, and functions at network level. In this paper, we present a comprehensive survey on three main characteristics of PINs: centrality, modularity, and dynamics. 1) Different centrality measures, which are used to calculate the importance of proteins, are summarized based on the structural characteristics of PINs or on the basis of its integrated biological information; 2) Different modularity definitions and various clustering algorithms for predicting protein complexes or identifying functional modules are introduced; 3) The dynamics of proteins, PPIs and sub-networks are discussed, respectively. Finally, the main applications of PINs in the complex diseases are reviewed, and the challenges and future research directions are also discussed.     

Method Based on Time Randomization to Resist Fault Sensitivity Analysis

A fault sensitivity analysis (FSA)-resistance model based on time randomization is proposed. The randomization unit is composed of two parts, namely the configurable register array (R-A) and the decoder (chiefly random number generator, RNG). In this way, registers chosen can be either valid or invalid depending on the configuration information generated by the decoder. Thus, the fault sensitivity information can be confusing. Meanwhile, based on this model, a defensive scheme is designed to resist both fault sensitivity analysis (FSA) and differential power analysis (DPA). This scheme is verified with our experiments.     

Jitter Tests and Studies for the Azimuth Axis of the TMT Tertiary Mirror System

太阳辐照度绝对辐射计的灵敏度研究与优化

衣小龙^1,2,方伟¹,骆杨¹,夏志伟¹,王玉鹏¹

（1. 中国科学院 长春光学精密机械与物理研究所,长春 130033;

2. 中国科学院大学,北京100049）

创新点说明：

1）通过理论分析以及实验测量的手段,研究灵敏度非线性误差对太阳辐照度绝对辐射计测量精度的影响;

2）提出了太阳辐照度绝对辐射计的测量新方法,通过实时修正灵敏度补偿了灵敏度的非线性误差,从而提高测量精度。

研究目的：

目前太阳辐照度绝对辐射计的定标精度随光功率的降低而下降,本文主要研究目的是提高太阳辐照度绝对辐射计的测量精度,从而提高定标精度。

研究方法：

通过理论分析以及实验测量的路线研究灵敏度非线性,通过修正灵敏度误差提高太阳辐照度绝对辐射计的测量精度。基于两点插值原理提出优化的测量方法。在各个辐射功率下测量实时修正灵敏度,得到灵敏度非线性的相对系统误差为2.2%,分析灵敏度非线性的影响。同时使用新方法以及传统方法测量辐射功率。

结果：

比对实验结果说明新方法将测量精度提高到0.1%,通过实时修正补偿了灵敏度非线性。

结论：

1）新方法可以显著提高地面比对实验的定标精度;

2）灵敏度非线性研究为优化太阳总辐照度监测仪的在轨定标精度提供了理论和实验依据。

关键词：测量精度;绝对辐射计;辐射定标;太阳辐照度

     

基于硬件架构和虚拟化扩展机制的虚拟机自省机制研究

针对现有虚拟机自省技术利用不可信被监控操作系统的内核数据结构在内存中的期望布局及内核函数构建被监控系统语义、无法抵抗直接内核数据结构操纵攻击的问题,对虚拟机自省机制的能力进行全面分析,并对利用虚拟机自省机制可应对的恶意攻击进行分类,提出更具健壮性的基于硬件体系架构和虚拟化扩展机制的虚拟机自省技术,通过硬件体系结构提供的虚拟机自省特性被动地观察与收集被监控系统信息,并利用虚拟硬件扩展机制主动地截获客户虚拟机内部的事件和指令,达到主动监控的目的.描述了基于硬件的虚拟机自省机制在系统调用序列收集与监控上的应用,并进行了效率测试分析.     

提升市民素质:新型城镇化的应有之义

新型城镇化的发展与实现在很大程度上都取决于人的素质的提高。新型城镇化步伐不断推进,但市民在心理素质、思想道德素质、专业技能素质、法律素质等方面存在可提升的空间。因此,要高度重视新型城镇化进程中人的素质问题,统筹协作,积极寻求其提升的有效路径。     

丝网编织金属橡胶的静态力学性能研究

针对沉孔型金属橡胶制品展开研究,采取了控制变量和对比分析的2种研究方法,对金属橡胶制品的静态压缩和剪切性能进行了系统全面的实验研究。通过实验结果给出了在不同结构参数下金属橡胶制品静态性能的变化关系,同时得到了金属橡胶制品在压缩过程中的线性-软特性-硬特性的变化过程。针对不同状态下的减振耗能情况对金属橡胶减振的机理进行深入的剖析,进而得知相对密度与变形幅值是影响金属橡胶减振器减振能力的2个重要参数。     

An effective thermal conductivity model for unsaturated compacted bentonites with consideration of bimodal shape of pore size distribution

An effective thermal conductivity model was proposed for unsaturated compacted bentonites with consideration of the bimodal shape of pore size distribution curves.The pores of soils were grouped into two dominant pore size modes corresponding to the intra-and inter-particle pores,and were simulated with randomly distributed spheroidal inclusions of different aspect ratios.With the assumption of preferential invasion of the wetting fluid(water)into pores of smaller sizes and by virtue of the analytical solution to the inhomogeneous inclusion problem in heat conduction,the model was developed using the Mori-Tanaka(MT),Ponte Casta?eda-Willis(PCW)and self-consistent(SC)homogenization approaches for different considerations of the interactions between pores and the solid phase.The proposed model is functions of the thermal conductivities of the solid,liquid and gas phases,porosity,the degree of saturation,the aspect ratios of pores and/or soil particles,and the fraction of the smaller group of pores.The proposed model was validated against five sets of laboratory measurement data on the MX-80,FEBEX,Kunigel-V1 and GMZ01 bentonites,showing a good agreement between the model predictions and the laboratory measurements.The responses of the model with respect to the geometries of pores and solid particles were examined.Compared to series-parallel structural models,the proposed model may overall exhibit better performance if proper homogenization schemes are adopted,but as an advantage,the model has clearer physical mechanisms and a smaller number of parameters.     

随机供求下农产品供应链协调模型研究

基于农产品随机供求情形,并考虑产品残值收益和缺货损失成本,研究了农产品供应商和销售商组成的二级供应链的协调问题。通过对集中控制决策和分散无协调决策时的利润分析,设计了随机供求下农产品供应链利润共享契约协调模型,在合理的利润分配参数下,供应链可以实现最优。最后,通过算例分析验证了模型的科学性和有效性。     

奥氏体不锈钢双电极焊条单弧焊工艺分析

研究了板厚8mm的1Cr18Ni9Ti奥氏体不锈钢双电极单孤焊工艺参数，比较了单、双电极电孤焊工艺特点。试验结果表明，奥氏体不锈钢双电极焊条单孤焊工艺具有高效节能、焊缝成形好、热影响区窄的特点。