认知网络中基于无性繁殖优化的组播路由算法

为了保证网络用户的服务质量,认知网络与可信网络从提高网络的智能性与可信性方面提供了保证机制.基于人工免疫系统的智能化特征,在认知网络架构的基础上,提出了一种基于无性繁殖优化的可信QoS组播路由算法.该算法将免疫器官的功能集成在网络节点中,使其具备认知能力.同时,采用滑动窗口思想设计信任评价机制,对每个网络节点的行为记录进行信任评价.根据无性繁殖优化机制,基于用户满意度和节点的信任值进行路由选择,得到满足用户服务质量需求的可信路由最优解.最后,在仿真平台上将该组播路由算法与经典组播路由算法进行性能评价,结果表明,该算法能够为网络用户提供更好的服务质量.     

Protective action of CLA against oxidative inactivation of paraoxonase 1, an antioxidant enzyme

The effect of CLA on paraoxonase 1 (PON1), one of the antioxidant proteins associated with HDL, was investigated for its protective action against oxidative inactivation as well as its stabilization activity. When cis-9 (c9),trans-11 (t11)-CLA and t10,c12-CLA were examined for their protective activity against ascorbate/Cu²⁻-induced inactivation of PON1 in the presence of Ca²⁺, two CLA isomers exhibited a remarkable protection (E _max, 71–74%) in a concentration-dependent manner (50% effective concentration, 3–4 μM), characterized by a saturation pattern. Such a protective action was also reproduced with oleic acid, but not linoleic acid. Rather, linoleic acid antagonized the protective action of CLA isomers in a noncompetitive fashion. Additionally, the two CLA isomers also protected PON1 from oxidative inactivation by H₂O₂ or cumene hydroperoxide. The concentration-dependent protective action of CLA against various oxidative inactivation systems suggests that the protective action of CLA isomers may be mediated through their selective binding to a specific binding site in a PON1 molecule. Separately, the inactivation of PON1 by p-hydroxymercuribenzoate (PHMB), a modifier of the cysteine residue, was also prevented by CLA isomers, suggesting the possible existence of the cysteine residue in the binding site of CLA. The c9,t11-CLA isomer seems to be somewhat more effective than t10,c12-CLA in protecting against the inactivation of PON1 by either peroxides or PHMB, in contrast to the similar efficacy of these two CLA isomers in preventing ascorbate/Cu²⁺-induced inactivation of PON1. Separately, CLA isomers successfully stabilized PON1, but not linoleic acid. These data suggest that the two CLA isomers may play a beneficial role in protecting PON1 from oxidative inactivation as well as in its stabilization.     

基于特征块的细胞核提取方法

提取细胞核图像是定量分析有核细胞形态的重要前提．该文针对血液显微图像中细胞核的颜色不均匀性，仿照人的视觉以整体的综合特征为主导的识别原理，提出了一种基于特征块的细胞核自适应提取方法．首先寻找条件比较典型的细胞核特征块，然后进行块生长，找出其余的内部块和边界块，从而获得整个细胞核区域．基于特征块的细胞核提取方法可以适应多种情况，能够快速、准确和完整地提取细胞核．     

Extraction of karyocytes and their components from microscopic bone marrow images based on regional color features

Extracting karyocytes and their components from microscopic bone marrow images is prerequisite for computer-aided early diagnosis of hemopathy. Most existing methods assume all pixels belonging to a karyon region or a cytoplasm region have similar colors. Practically, the color of neither a karyon nor a cytoplasm in a microscopic image is homogeneous in the pixel level. Therefore, the regional color features of a region are emphasized in this paper. Based on this observation, we propose a novel method to karyocyte extraction that first identifies a karyon by 4-connected block growing from a karyon feature block, then identifies feature blocks of its cytoplasm based on the extracted karyon, and finally extracts all cytoplasm regions by growing the cytoplasm feature blocks. Combining the karyon region and the corresponding cytoplasm regions can attain a complete karyocyte. Experimental results show that the proposed method is effective and robust.     

Multiple secret image sharing with general access structure

Multimedia Tools and Applications - Boolean-operation-based secret image sharing (BSIS), which aims to encode a secret image into some shared images and discloses the original secret image later,...     

华北地台北缘金矿资源潜力及金矿活化成矿论

华北地台北缘金矿资源潜力巨大.区域潜在含金性是形成金矿化集中区的首要前提.通过二次活化再成矿是金矿成矿的主要机制.在成因上与太古宙层状岩系有关,类型和对代各异的一系列金矿床构成了地台区特有的金矿床系列.     

MnCo2O4涂层对SUS430合金连接体的表面改性研究

采用溶胶-凝胶法制得MnCo₂O₄纳米粉体, 通过XRD和TEM分析了粉体的物相和形貌; 通过添加适量乙基纤维素和松油醇经研磨制成浆料, 并采用丝网印刷法涂覆于SUS430基片上, 在900℃下95%N₂+5%H₂气氛中保温3 h, 再于800℃空气气氛中保温10 h烧结得到涂层。采用SEM对涂层的表面和断面进行了观察, 在750℃空气气氛下测试了SUS430/MnCo₂O₄样品的导电性能和抗氧化性能, 最后采用EDS对涂层的断面进行分析。结果表明: MnCo₂O₄粉体为单一的立方尖晶石相, 晶粒大小均匀, 粒径约150 nm; MnCo₂O₄涂层致密,与基体紧密结合且厚度均匀。SUS430/MnCo₂O₄样品在750℃空气气氛下经1000 h氧化后, 氧化增重量仅为0.15 mg/cm², 是SUS430合金氧化增重量的1/6; 面比电阻值为0.026 Ω·cm², 比SUS430合金的面比电阻值低了两个数量级; EDS结果表明: Cr元素主要分布在涂层与合金的界面, 在涂层内部无分布。研究显示, MnCo₂O₄涂层能显著降低SUS430合金基体的氧化速率, 有效改善其在高温下的导电性能, 并成功抑制Cr元素的挥发。     

One-step and rapid synthesis of composition-tunable and water-soluble ZnCdS quantum dots

ZnCdS quantum dots have been successfully prepared at room temperature in aqueous solution with sodium hexametaphosphate as stabilizer and thioacetamide as the source of S. The photoluminescence (PL) spectra and UV-Vis absorption spectra of the ZnCdS quantum dots were determined on the basis of the initial Cd/Zn mole ratio (Cd/Zn = 8/0, 7/1, 6/2, 5/3, 4/4, 3/5, 2/6, 1/7 and 0/8) and the concentration of thioacetamide. The emission peaks first showed a red shift and then a blue shift with the increasing initial Zn concentration, which provided the evidence of formation of CdS/ZnCdS core/shell and ZnCdS alloyed quantum dots. The ZnCdS quantum dots were compared with CdS (ZnS) quantum dots doped with Zn2+ (Cd2+). The samples have also been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS).     

ZnO hierarchical nanostructures and application on high-efficiency dye-sensitized solar cells

Uniform hierarchical ZnO nanostructures are synthesized on a large scale based on a solution approach at low temperature. The primary ZnO hexagonal prisms are firstly produced by the reaction of Zn(NO₃)₂ with hexamethylenetetramine, and then ZnO branches grow on the primary prisms by using ethylenediamine molecules as an evocator. The morphology of the hierarchical nanostructure can be controlled conveniently by adjusting the molar ratio of [EDA]/[Zn²⁺]. The hierarchical structure provides an effective pathway for carrier transport as well as larger surface area for dye adsorption, when ZnO hierarchical nanostructures serve as photoanode materials, the solar cells show higher conversion efficiency than that of primary ZnO nanowires.     

ZnO-Au hybrid nanocrystals via a high temperature reflux route

ZnO-Au hybrid nanocrystals with good dispersibility and uniform size are prepared via a high temperature reflux route. The structure, morphology, interface structure and optical properties were characterized by X-ray diffraction high resolution transmission electron microscope and UV-vis absorption spectrophotometer. The formation of hybrid nanocrystals was believed to arise from the heterogeneous nucleation and epitaxial growth, high temperature and surfactant are proposed as the key factors for producing fine and uniform hybrid nanocrystals.