High efficient and secure group key management scheme based on optimized GDH

针对gdH(grOuP dIffIE-HEllMAn)方案中节点可能成为系统的瓶颈以及计算复杂度、通信代价和存储复杂度远高于某些集中式方案等缺陷,提出并实现了一种基于优化gdH协商的高效安全的动态群组密钥管理方案,并对其安全性进行了证明。通过对计算量和通信量进行分析比较表明,优化gdH协商协议具有很大的优势,并且能够快速产生或更新组密钥,具有很强的实用性。There are some defects in GDH(group diffie-hellman) scheme,such as the node that may become the bottleneck of the system,and the computational complexity,cost of communications and storage complexity that are much higher than some centralized group key management program.An efficient and secure dynamic group key management scheme based on optimized GDH is proposed and implemented and its security is proven.The optimized GDH consensus agreement has great advantage than GDH by comparing and analysing the volume of calculating and traffic.At the same time,the optimized GDH consensus agreement can quickly produce and update group key,and it owns highly practicability.国家自然科学基金资助项目(60873179);广西教育厅科研资助项目(200707LX196

A quickly-speed running watermarking algorithm based on quantum evolutionary algorithm

针对传统基于人类视觉系统特性的空间域与变换域相结合的水印算法中嵌入信息量小、嵌入位置定位及检测准确率低和算法运行速度慢等缺陷,提出并实现一种基于量子进化算法(QEA)的快速水印新算法。仿真实验结果表明,新算法不仅生成水印图像的速度快,而且对各种攻击具有良好的敏感性和鲁棒性。新算法在应用中有较大的灵活性,并且具有可嵌入信息容量大、运算速度快和可操作性强等特点。There are limitations such as smaller embedded information capacity,lower accurate rate for positioning embedded location and detection and slower running speed in traditional watermarking algorithm which combines spatial domain and transform domain based on characteristics of human visual system.A quickly-speed running watermarking algorithm based on quantum evolutionary algorithm is proposed and implemented.The simulation results show that the proposed algorithm owns not only faster watermark image generation,but also have good sensitivity and robustness for all kinds of attacks.The proposed algorithm is more flexible in application,and it can embed more information and improve the computing speed.The method can be easily operated.国家自然科学基金资助项目(60873179);广西教育厅科研资助项目(200707LX196

Characterization Method for Metallothioneins by Reversed- Phase Liquid Chromatography Coupled with Electrospray Ionization Mass Spectrometry

通过反相液相色谱(RPLC)与电喷雾电离质谱(ESI MS)的联用技术,对镉诱导金属硫蛋白标准物质MT 1和MT 2的结构进行表征分析。采用VydacC8反相色谱柱(250mm×2 1mmi d ,5μm,30nm),流动相A为pH6 0的5mmol/L乙酸铵水溶液,流动相B为pH6 0的5mmol/L乙酸铵的甲醇 水(体积比为1∶1)溶液,流动相流速为0 20mL/min,在40min内流动相B的体积分数从10%增加到37 5%进行梯度洗脱。分别用紫外(UV)和ESI MS检测,可获得总离子流色谱图及与其色谱峰对应的质谱图。通过对MT 1和MT 2的质谱信号的解析,发现通过该法获得的MT结构形态大多与前人报道的结果吻合。还测定了兔肝MT的多形态结构,利用酸化脱金属硫蛋白(apo MT)使谱图简化,可清晰地获得在兔肝中存在的各种MT亚型和次亚型结构形态。Mammalian metallothioneins (MTs) usually have two major isoforms, MT-1 and MT-2, existing in tissues because of the genetic polymorphism. Metallothionein isoforms and sub-isoforms were characterized with a hyphenated technique of reversed-phase liquid chromatography (RPLC) coupled with electrospray ionization mass spectrometry (ESI-MS). The MT-isoform separation was carried out using a C_8 narrow-bore column Vydac C_8 (250 mm×2.1 mm i.d., 5 μm, 30 nm). Buffer A was 5 (mmol/L) ammonium acetate in water (pH 6.0) and buffer B was 5 (mmol/L) ammonium acetate in methanol-water (1∶1, v/v) (pH 6.0). A linear gradient elution was used by increasing buffer B from 10% to 37.5% within 40 min. The flow rate was set at 0.20 (mL/min). The tentative formulas of MT isoforms and subisoforms were interpreted with the measured masses at the vicinity of apexes in total ion current chromatogram of ESI-MS and the reference data reported previously. The method was validated with the standard reference materials of MT-1 and MT-2. The results indicated that many MT species interpreted were in good agreement with the reference data reported. The MT sample from rabbit liver was measured with the established method. The results, of which the apo-MT was used by (acidification) of the sample for simplifying the mass spectra, showed that there were species of MT isoforms and subisoforms in rabbit livers.国家自然科学基金(No.20175022);; 福建省重点招标项目子课题(No.2003Y005 04);; 厦门大学现代分析科学教育部重点实验室开放课题(B40402)

Characterization of Hg-Binding Metallothioneins in Tissues of Rat after Oral Intake of Mercury Chloride by Size-Exclusion Chromatography Coupled with Inductively Coupled Plasma-Mass Spectrometry

通过测定大鼠脏器组织中汞的总量、金属硫蛋白(MTs)含量及利用尺寸排阻色谱(SEC)与电感耦合等离子体质谱(ICP MS)联用技术,分析了灌喂HgCl2大鼠脏器组织中汞与MTs的积累量及金属与MTs的结合形态。结果表明,灌喂HgCl2大鼠各脏器中汞的积累量显著高于其相应的对照组,特别是在肾、肝和睾丸中汞的含量较高,表明此3个脏器受汞的危害最大。MTs的含量水平说明当大鼠脏器受汞污染时,肌体中的MTs将被大量诱导产生以对重金属进行解毒。通过SEC ICP MS联用技术获得了组织中的金属与MTs的结合形态,其中被汞污染的大鼠的肾脏、肝脏中Hg MTs的诱导产生量比对照组显著增加,与此同时,染汞组织中Cu MTs的组分也相应增加,这进一步表明了MTs在染汞大鼠肾脏中起着对有毒重金属汞的解毒和对营养元素铜的调节作用。Hg concentrations, total metallothioneins (MTs) and metal-binding MTs in tissues of the rat after oral intake of HgCl_2 were determined by the inductively coupled plasma-mass spectrometry (ICP-MS), a modified mercury saturation assay and the size-exclusion chromatography (SEC) coupled with ICP-MS, respectively. The results indicated that Hg accumulation in all of the rat tissues, including kidney, liver, testicle, brain, heart, serum and blood plasma, in HgCl_2 group significantly increased compared with that in the control group, especially in kidney, liver and testicle. A large amount of MTs was induced in these exposed rat tissues, especially in their kidneys and livers. The metal species binding with MTs obtained with SEC-ICP-MS showed that the fractions of Hg-MTs in both kidney and liver of exposed rat were significantly higher compared with those of the control. In addition, higher amounts of Cu-MTs observed in exposed rat liver and kidney demonstrated the effect of MTs in the homeostasis of Cu and in the detoxification of Hg.国家自然科学基金资助项目(No.20175022)

21世纪中国金融学教学改革与发展战略

国家教育部新世纪教改工程项目《21 世纪中国金融学专业教育教学改革与发展战略研究》, 目前已取得阶段性成果。2001 年8 月16 日至21 日, 承担该项目的中央财经大学、中国人民大学、厦门大学和复旦大学在青海省西宁市举行了成果交流和研讨会。项目主持人、中央财经大学副校长、金融学博士生导师王广谦教授主持了这次会议, 全国所有有金融学博士学位授权点的高校和科研院所都有代表出席大会, 用主持人的话来说, “全国金融学界顶尖级人物基本上都到了”。出席会议的还有教育部高等教育司刘凤泰副司长和杨志坚处长。与会专家学者回顾了近20 年国内外金融业的迅猛发展, 分析了在21 世纪随着经济全球化、金融国际化对我国经济金融带来的机遇和挑战, 以及对我国金融研究、金融学科建设和人才培养带来的冲击,大家认识到, 经过20 年的改革开放和发展, 目前我国在这些领域虽有长足的进步, 但仍远远不能适应形势发展的要求。要想把我国金融学科建设成国际一流学科, 培养出一流的高素质金融专业人才, 还必须进行一系列改革与创新。与会专家教授根据各自的教学实践, 提出了许多具有建设性的意见。研讨会上发言踊跃、气氛热烈, 不时出现不同观念的碰撞和不同观点的交锋, 对推进金融学科建设十分有益。下面将著名专家教授颇具代表性的观点( 按发言顺序) 择要摘发, 以飨读者, 以推动中国金融学科的建设与繁荣

湖北省菊属植物新纪录及其生物地理学意义

报道了湖北省菊属(Chrysanthemum L.)植物新纪录种小山菊(Chrysanthemum oreastrum Hance)。这一新发现表明中国北方与鄂西地区在植物区系上紧密联系