移动Agent在分布式工作流管理系统中的应用

分布式网络环境的异构性阻碍了工作流管理系统中任务进程间的协调与互操作，为有效实现了工作流在分布计算环境中的协同工作，本文在分析分布式工作流管理系统特点及CORBA，Agent技术的基础上，提出一种基于CORBA通信平台、多Agent协同工作的工作管理系统，主要涉及分布工作流系统的执行结构，CORBA服务框架，多Agent协作系统组成与通信、以及移动Agent的运行和通信机制，通过移动Agent在CORBA中的引入增加了系统智能性，自主性，从而便于协同处理开放分布式环境下工作流应用开发，优化企业资源和推进业务流程重组。     

移动Agent技术的研究

移动Agent是分布式计算技术和人工智能技术有机结合的产物.是未来的主流分布式计算模式.本文重点研究了移动Agent系统的体系结构和通信机制,并利用移动Agent技术实现了电子商务系统原型.     

基于移动Agent的分布式入侵检测系统

指出了传统入侵检测系统的缺点和存在的问题，分析了移动Agent技术的特点．针对现存问题．提出了基于移动Agent的入侵检测解决方案，给出了其体系结构及关键技术．该系统具有良好的可分布性、可扩展性、实时性和安全性，是一种有效、可行的方案．     

移动Agent技术在电子商务上的应用初探

分析和比较了Web技术和移动Agent技术在电子商务上应用的优缺点,介绍了对移动Agent技术及基于移动Agent技术的电子商务进行的研究和尝试：移动Agent环境Mogent系统及在Mogent基础上的一个电子商务模型e_market。Mogent系统在结构化迁移机制、分层多模式的通信框架以及完善的安全体系结构上具有鲜明的特点,在其上进行的e_market模型是一个开放式的电子商务系统模型,可看出移动agent技术为电子商务应用提供了一种非常灵活和有效的基础架构,并且在主动信息发布、信息的检索和获取、交易的磋商和谈判、磋商的安全保证等方面给出了有效的支持。该模型充分展示了移动agent技术用于电子商务系统构建时的开放性、灵活性和网络适应性优势。     

可信移动Agent的研究及在分布式网络管理中的应用

为解决分布式网络管理的安全问题,利用移动Agent框架作为底层平台,应用VMC概念将移动Agent和SNMP Agent相融合,构建一种基于可信移动Agent的安全体系结构.实验结果表明,采用此体系结构的网络管理系统能够确保移动Agent的可信性.因此,该体系结构在受到Agent到Agent平台或Agent到Agent攻击情况下的安全性得到评估,证明在网络管理任务中其性能是可信的.     

网络管理中的新技术及其应用

分析了传统的基于C/S模型网络管理技术的一些缺陷，系统地描述了目前网络管理中的一些新技 术及其应用，如Web技术，CORBA技术和移动Agent技术等，并分析了各自的优;缺点<综合CORBA技术和移动Agent技术的网络管理系统可以提高网络管理中的实时性和智能化，方便地实现网络的自主管理。     

基于移动Agent技术协作信息共享的研究

介绍了移动Agent的概念、体系结构、技术特点和优势,并系统地研究了一种基于移动Agent技术的协作信息共享的实现模式。     

安全的移动Agent系统体系结构--Jamogent

在分析现有移动 Agent系统特点和 MASIF规范的基础上给出一个具有高安全性的移动 Agent系统体系结构—— Jamogent,描述其工作流程 ,并给出一种安全的加密和数字签名算法     

基于多Agent的敏捷供应链的框架系统研究

通过介绍敏捷供应链的概念,利用Agent与CORBA技术,定义了各功能Agent的作用和职能,研究了基于多Agent的供应链管理协作内容,提出一种多智能Agent敏捷供应链的框架系统,利用此系统,能较容易实现企业的信息集成,对于开发类似系统具有实际指导意义。     

一个基于移动Agent的分布式入侵检测系统

目的 针对当前入侵检测系统扩展性、容错性和适应性差的问题，提出并重点研究了一个将移动Agent技术应用于分布式网络监测和入侵检测系统的技术方案。方法 设计并实现了一个基于移动Agent技术的网络监测和入侵检测系统，分析讨论了系统体系结构、功能设置、移动Agent组成与应用等问题。结果 所设计的系统具有分布、异构、灵活和可扩充的优点。结论 所完成的工作对大型网络应用和网络管理系统的开发有一定借鉴意义。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.