基于移动代理平台Aglet的柔性工作流的研究与实现

分析了柔性工作流管理系统的特点以及可移动Agent技术，提出了一种基于移动代理平台的柔性工作流管理系统的体系结构，并采用Aglet平台实现了原型系统．在原型系统中，业务过程的定义封装在可移动的工作流引擎Agent中，MA(Mobile Agent)迁移到各执行任务的角色所在节点，驱动并监控任务的执行；利用多个Agent之间位置透明的通信、协同工作，使得业务过程的定义在执行中可动态修改，实现了工作流的柔性．     

应用BP神经网络模型实现内圆磨床主要零件的快速反应设计

用数字化模型代替三维实体模型，将内圆磨床主要大件的BP神经网络模型放入数据库信息管理系统，应用较简单的使用方法实现了零件结构的再修改、灵敏度分析及优化．根据所提出的方法，通过从数据库信息管理系统中调用桥板的数据文件，对其进行结构参数修改、灵敏度分析及以第1阶扭转频率最高为目标的设计变量自动搜索寻优计算，结果表明将BP神经网络模型与数据库信息管理系统结合是实现零件快速反应设计的有效途径．     

考虑误差影响的力学参数反分析神经网络方法研究

通过求偏导技术将反分析的参数误差分别表示为模型误差与测量误差的函数，利用这些函数研究了模型误差与测量误差在力学参数反分析神经网络方法中的传递过程以及影响反分析结果的影响因素．研究结果说明：输入变量的选择严重影响力学参数反分析的精度，选取力学参数灵敏度大的测点位移作为神经网络的输入变量，可以减小模型误差与测量误差对反分析结果的影响．这对提高力学参数反分析的实用性与可信性有重要意义．     

掺杂Fe3+的纳米TiO2光催化降解氮氧化物研究

利用Fe(NO3)3*9H2O,采用浸渍的方法,制备了掺Fe3+的纳米TiO2.讨论了此种纳米TiO2对氮氧化物的光催化效率,并分析了Fe3+在催化过程中的作用.试验结果表明:Fe3+明显提高了纳米TiO2的光催化性能;在室内自然光作用下对较高质量浓度的氮氧化物均具有较高的光催化效率.通过对TEM照片和XRD谱的分析,从能级理论解释了Fe3+提高催化活性的原因.     

一种基于SPIHT的分层图像压缩方法

提出一种利用SPIHT算法进行图像分层压缩的编码方法,该方法首先利用图像平滑技术将图像分解为平滑部分和轮廓部分,然后以一定的编码率分别对它们进行编码.实验结果表明,合理分配各层的编码率,能够获得视觉效果比单独采用SPIHT编码更好的编码图像.     

基于粗糙集理论的模糊信息分类方法

介绍了属性约简的概念,并用模糊语义距离矩阵解决了含有模糊数据的相互依赖的数据库的信息分类问题。     

基于移动数据库的异构数据一致性技术研究

从移动数据库体系结构的演变、数据一致性技术的分类和异构数据同步协议(SyncML)的架构等3个方面介绍了基于移动数据库的异构数据的一致性技术，并结合三者优势提出了DM／SMDS模型，为移动环境下快速、高效地实现数据收敛提供了一种可行的解决方案。     

使用IEEE802.1X技术优化校园网计费管理

通过对IEEE 80 2 .1X技术的认证计费系统的分析 ,论述如何用其解决校园网计费管理中现存的问题 ,优化校园网的计费管理     

Evolution of the South China Sea and monsoon history revealed in deep-sea records

As the third summary report of ODP Leg 184 to the South China Sea (SCS), this paper discusses the evolution of the East Asian monsoon and the SCS basin. A multi-proxy approach, involving geochemistry, micropale-ontology, pollen and other analyses, was adopted for reconstructing the evolutionary history of the East Asian monsoon, which was characterized by a series of paleo-climate events especially at 8, 3.2, 2.2 and 0.4 Ma. The new record indicates similar stages in the development of the East and South Asian monsoons, with an enhanced winter monsoon over East Asia being the major difference. The rich spectrums of monsoon variability from the southern SCS also reveal other characteristic features of the low latitude ocean. Evidence for the evolution of the SCS includes the hemipelagic Oligocene sediments, implying the existence of deep water environments during the early seafloor spreading stage of the SCS basin. The four major unconformities and some remarkabl ediagenetic features in upper Oligocene deposits indicate the strongest tectonic events in the region. From a careful comparison of lithologies and sedimentation rates, we conclude that the prominent differences in sedimentary environments between the southern and northern SCS were established only by ～3 Ma.     

Inhibitory effect of the adenovirus type 5 E1A protein expressed in the yeast system of the human tumor cell growth

Adenovirus 5 type E1A as a tumor suppressor gene can inhibit tumor growth and enhance the censitivity of chemotherapy and radiotherapy.E1A have the ability to integrate into the host genome,resulting in long-time expres-sion that induces Rb gene inactivation and animal cells im-mortalization.This prompted us to select the E1A protein for treatment of cancer in order to overcome the limitations of E1A gene therapy.Thus,we firstly comstructed E1A eu-caryotic expression vector (pPIC9/E1A),transformated the pichia pastoris yeast cells(GS115) and screened the high-expressing recombinant strains.The positive yeast strains were cultured in the shake flask,and induced for 3d.The crude E1A protein was purified using two steps of col-umu chromatography on HiTrap Q and HiTrap SP.The pu-rified E1A protein was identified by SDS-PAGE and Western blot.E1A protein was mostly located at cellular unclear when Cheriot delivered E1A protein into cells.The analysis in vitro indicated that the E1A protein arrested LN686 cell cycle at G2/M phase,and significantly inhibited the growth of LN686 tumor cells.The current studies firstly provided an experimental basis to further develop E1A protein for tumor treatment.