浅谈医院信息建设的数据安全

文章从医院信息建设中的数据维护安全性分析、双机容错设备的选择和应用、备份及灾难恢复、科学管理工作流程等方面，探讨医院信息建设中数据安全维护与应用。     

宽带综合业务数字网B-ISDN

数字化、网络化、信息化,一场新的信息技术革命铸造一个综合各种信息业务的大容量、易交换、高稳定、智能化的高速数据多媒体通信网--宽带综合业务数字网B-ISDN.     

Integrated dynamic wet spinning of core-sheath hydrogel fibers for optical-to-brain/tissue communications

Hydrogel optical light-guides have received substantial interest for applications such as deep-tissue biosensors, optogenetic stimulation and photomedicine due to their biocompatibility, (micro)structure control and tissue-like Young''s modulus. However, despite recent developments, large-scale fabrication with a continuous synthetic methodology, which could produce core-sheath hydrogel fibers with the desired optical and mechanical properties suitable for deep-tissue applications, has yet to be achieved. In this study, we report a versatile concept of integrated light-triggered dynamic wet spinning capable of continuously producing core-sheath hydrogel optical fibers with tunable fiber diameters, and mechanical and optical propagation properties. Furthermore, this concept also exhibited versatility for various kinds of core-sheath functional fibers. The wet spinning synthetic procedure and fabrication process were optimized with the rational design of the core/sheath material interface compatibility [core = poly(ethylene glycol diacrylate-co-acrylamide); sheath = Ca-alginate], optical transparency, refractive index and spinning solution viscosity. The resulting hydrogel optical fibers exhibited desirable low optical attenuation (0.18 ± 0.01 dB cm⁻¹ with 650 nm laser light), excellent biocompatibility and tissue-like Young''s modulus (<2.60 MPa). The optical waveguide hydrogel fibers were successfully employed for deep-tissue cancer therapy and brain optogenetic stimulation, confirming that they could serve as an efficient versatile tool for diverse deep-tissue therapy and brain optogenetic applications.     

基于标量衍射理论的图像解密三维信息构造方法

提出合理设置相位延迟以提高光学三维信息解密质量的方法. 利用多个垂直于同一光轴的二维函数,分别以离轴和同轴的形式构造简单三维信息. 采取基于相位抽取的光学三维信息加密算法进行模拟,验证了同轴构造三维信息解密质量受噪声干扰较大,且噪声的产生与加密过程中的相位抽取无关. 通过考察信息相位分布和相位延迟对解密质量的影响,证明合理设置相位延迟可降低解密噪声. 设计2种相位延迟设置方案,分析相应的约束条件.     

Bayesian and frequentist estimation of the performance of free space optical channels under weak turbulence conditions

Approximate mathematical form expressions were derived for the estimation of the average (ergodic) capacity and the average bit error rate of a log-normal free space optical channel in the cases of weak to moderate atmospheric turbulence conditions. We investigate the average capacity, the average bit error rate and the outage probability of free space optical communication channels using the frequentist and the Bayesian approach. Emphasis is given on the cases of weak to moderate atmospheric turbulence leading to channels modeled by log-normal distributed intensity fading. Furthermore, accurate approximate closed-form expressions and estimation procedures for their achievable capacity as well as their bit error rate and the important parameters of interest are derived. The derived approximate analytical expressions are verified by various numerical examples and simulations. Moreover, each methodology is reviewed in terms of their analytic convenience and their accuracy is also discussed.     

Heaviest yet LBO monocrystal grown at CAS

After three years of hard work, a research team led by Prof. HU Zhanggui with the CAS Technical Institute of Physics and Chemistry has made breakthrough progress in the studies of lithium triborate （LBO）, a nonlinear optical crystal.     

闪锌矿型CdTe电子结构和光学性质的第一性原理

采用基于密度泛函理论(DFT)框架下广义梯度近似平面波超软赝势法,计算了闪锌矿型CdTe的能带结构、态密度和光学性质.计算表明,闪锌矿型CdTe为直接带隙半导体,禁带宽度为0.671eV.计算并分析了闪锌矿型CdTe的复折射率、复介电函数、吸收系数、光电导率、损失函数和反射率,其折射率为2.69,静态介电常数为7.23.计算结果与其他文献结果吻合较好,为闪锌矿型CdTe的应用提供了理论依据.     

大芯数松套层绞式光缆的结构参数设计和拉伸性能测试

介绍了144芯的大芯数松套层绞式接入网用通信光缆的结构形式、设计理念和设计参数,分析了光缆的拉伸性能与光缆结构参数的关系;给出了所生产的该种光缆的拉伸与应变性能测试结果．     

碳纳米点的制备及其非线性光限幅性能研究

以肝素钠为碳源,通过水热合成法制备碳纳米点（CNDs）,对所制得的CNDs形貌、组成及线性光学性能进行系统研究。结果表明,CNDs粒径均一,且表面富含羧基和羟基等官能团;在270 nm处有明显的紫外吸收峰。CNDs具有与激发波长相关的荧光特性,发射峰随激发波长增大的而红移。采用开孔Z-扫描法探索CNDs的非线性光学效应,结果表明,CNDs具有与能量相关的从饱和吸收向反饱和吸收转变的特性,其非线性吸收系数β和饱和能量IS分别为1.4×10^-11m/W和8×10¹⁰W/m²。     

双位相密钥衍射系统用于旋转抛物面包围三维信息加密的研究

用双位相密钥衍射系统以解决简单三维立体信息的加密问题. 选取旋转抛物面包围的三维信息作为加密对象,用相位恢复算法设计了双位相密钥. 计算机模拟结果证实了该系统的有效性,并揭示了不同约束条件、迭代次数等对三维信息整体恢复质量所造成的影响. 研究发现,应针对实际的设计需求在算法开销与整体恢复质量之间取得平衡.