Improvement of Identity-Based Threshold Proxy Signature Scheme with Known Signers

0 IntroductionIdentity-based (ID-based) cryptography[1]is rapidly emer-gingin recent years .The concept of the proxy signature scheme was first in-troduced by Mamboet al[2]in 1996 .The concept of thresholdproxy signature was proposed[3 ,4]. Apractical and secure (t,n) threshold proxy signature scheme should satisfy the secre-cy,the proxy protected,the unforgeability,the non-repudia-tion,the ti me constraint ,andthe known signers[5].In 2006 , Baoet al[6]proposed an ID-based thresholdproxy si…     

A Computationally Efficient Aggregation Optimization Strategy of Model Predictive Control

Model Predictive Control(MPC) is a popular technique and has been successfully used in various industrial applications.Howver,the big drawback of MPC involved in the formidable online computational effort limits its applicability to relatively slow and/or small processes with a moderate number of inputs.This paper develops an aggregation optimization strategy for MPC that can imporove the computational efficiency of MPC.FOr the regulation problem.an input decaying aggregation optimization algorithm is presented by aggregating all the original optimized variables on control horizon with the decaying sequence in respect of the current control action.     

酸雨的成因与地理分布

通过对由大气污染引起的酸雨的研究，从酸雨的类型，酸性污染物的来源等方面论述了酸雨的成因，分析了世界和中国酸雨的现状和地理分布，指出了这种环境污染问题的严重性。     

空位理论模型对单组分吸附等温线的模拟

在２９８．２ Ｋ温度和１３．３～１０１．３ｋＰａ压力范围内，测定了乙烯、乙烷和 二氧化碳单组分气体在ＡＥ型吸附剂上的吸附平衡数据．用空位溶液理论 模型对数据进行分析，并用顶点收敛法进行回归计算，得到了空位溶液理论 模型的四个物性参数：极限吸附量，享利常数ｂ，两个威尔逊参数Ａ１３和 ；用空位溶液理论对单组分等温线进行了很好地描述，使模型与全部压力 范围内的纯组分等温线得到很好地拟合．     

STABILIZATION OF A KIND OF PREY-PREDATOR MODEL WITH HOLLING FUNCTIONAL RESPONSE

The stabilization problem of a kind of prey-predator model with Holling functional responseis investigated.By approximate linearization approach,a feedback control law stabilizing the closed-loop system is obtained.On the other hand.by exact linearization approach,a suitable change ofcoordinates in the state space and a feedback control law render the complex nonlinear system to bea linear controllable one such that the positive equilibrium point of the closed-loop system is globallyasymptotically stable.     

A Shortest Path Problem

ＡＳｈｏｒｔｅｓｔＰａｔｈＰｒｏｂｌｅｍ￥ＪＩＡＺｈｅｎｇｓｈｅｎｇ（ＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓＤｅｐａｒｔｍｅｎｔｏｆＴａｉｙｕａｎＵｎｉｖｅｒｓｉｔｙｏｆｔｅｃｈｎｏｌｏｇｙＴａｉｙｕａｎ０３００２４）ＦＡＮＨｕｉ（Ｆｏｕｎｄ...     

经济全球化形势下企业的环境责任审计

阐述了经济全球化形势下对企业进行环境责任审计的必要性。指出了企业环境责任审计的具体内容,注重企业投资的可行性,对企业环境责任进行事前审计;评审企业环境成本和环境效益,对其环境责任进行事中审计;为使企业树立环保形象,对企业环境责任进行事后审计。认为作好企业环境责任审计工作,应从财务审计入手,评审其环保成本和环境效益;抓好重点行业、重点企业的环境责任审计;抓好乡镇企业的环境责任审计;加快制定环境责任审计的规范和评价标准;加强环境责任审计人员的培养。     

Experimental investigation of parallel optical data storage using pyrrylfulgide photochromic material

The optical storage characteristics of a new kind of organic photochromic material棗pyrrylfulgide were experimentally investigated in the established parallel optical data storage system. Using the pyrrylfulgide/PMMA film as a photon-mode recording medium, micro-images and encoded binary digital data were recorded, readout and erased in this parallel system. The storage density currently reaches 3?107 bit/cm2. The recorded information on the film can be kept for years in darkness at room temperature.     

Thermodynamic evolution of lithosphere of the North China craton： Records from lower crust and upper mantle xenoliths from Hannuoba

Lithospheric thinning in East China attracts much attention of geologists. In many cases where a lithospheric thinning is inferred, the trigger for instability is a preced-ing episode of crustal thickening by the continental colli-sion[1]. Lithospheric processes (e.g. lithospheric thinning) could be recorded by the thermal history of the lower crustal and upper mantle xenoliths. Xu et al.[2] suggested that the cooling (from >1200 to 850℃) recorded by spinel harzburgite from Northeast China …     

禽流感病毒H5亚型特异性抗原捕捉ELISA检测方法的研究

 在获得禽流感病毒多克隆抗体及H5亚型特异性单克隆抗体的基础上,研究建立H5亚型特异性抗原捕捉ELISA检测方法,用于检测H5亚型禽流感病毒.优化反应条件,确定包被抗体、检测抗体及酶结合物的最佳工作浓度,进行敏感性、特异性、重复性及稳定性分析,并与RT-PCR方法比较.同时使用该方法对野外样品进行检测.结果表明:该方法敏感、特异,具有良好的重复性和稳定性,可用于检测临床样品、鸡胚培养物及细胞培养物中的H5亚型禽流感病毒.