EKE协议的描述与TLA验证

行为时序逻辑(TLA)是Leslie Lamport于20世纪90年代提出的一种新的逻辑,运用这种逻辑对软件或协议系统进行建模,在一定程度上减少了由于状态空间爆炸带来的压力,它能在一种语言中同时表达模型程序与系统属性。文中首先介绍了行为时序逻辑的语法和语义,然后以EKE协议为例,用基于行为时序逻辑语言TLA+对EKE协议进行了建模分析,用TLA建模并用行为时序逻辑语言TLA+进行协议的描述,最后用TLC检测工具进行分析,发现存在中间人的重放攻击漏洞。     

一种基于TLA的解决N皇后问题的方法

行为时序逻辑语言(TLA+)是一种在模型检测范围内能够表达模型程序和逻辑规约的语言。N皇后问题是一个久远的问题,回溯法是解决该问题一种经典的方法。本文提出如何用行为时序逻辑语言TLA+去描述N皇后问题,然后使用Toolbox工具去检测n=5时该问题的全部解。     

基于插件技术的远程自动升级系统的研究

基于插件技术的远程自动升级系统将插件设计的思想引入系统体系设计中,构建出一种易扩展的插件运行体系架构,形成一个可为不同的应用软件共同提供远程自动升级服务的通用系统平台.系统结合C#面向对象语言中的反射技术,将各种升级服务组件以插件的形式动态插入系统中;不需编写升级程序,只需简单地制作一个升级任务列表文件就可以组合使用这些插件,快速地为不同应用软件创建定制升级包,构成各自独立的远程自动升级系统.     

基于行为时序逻辑TLA的Pastry协议的规约与验证

本文研究基于行为时序逻辑TLA的模型检测技术,阐述TLA的语义、语法和公平性问题。用基于TLA的系统描述语言TLA+对Pastry协议及其属性进行规约并用模型检测工具TLC对其进行验证。     

基于行为时序逻辑TLA的安全协议形式化分析与检测

随着近年来网络协议的不安全性,对安全协议进行形式化分析与检测则显的非常重要。而基于行为时序逻辑TLA的模型检测是形式化分析检测方法中重要的一种。本文主要采用基于TLA的HLPSL语言形式化分析与检测H.530协议。     

插件,让数字艺术创作展翅高飞

插件是根据需要和严格遵循某种规范的应用程序接口而编写出来的一个程序,是一组具备一定功能的代码集合."一个插件就是一个新功能",正确安装和运用插件,可使得某种软件的功能得到不断的完善和扩展,使其伸缩性更好和更具可维护性.插件为数字艺术创作和实践插上了腾飞的翅膀.插件有很多,有PhotoShop插件、3DS MAX 插件、Dreamweaver插件、IE插件等等.面对各式各样的插件,我们要学会和掌握对这些插件的正确管理,以更好地发挥插件在数字艺术创作和实践中的作用.     

基于插件技术的测土施肥决策系统设计

采用"平台+插件"模式的技术框架,设计实现了基于插件技术的测土施肥决策系统,解决了以往不同区域间测土施肥决策系统的可移植性差、可重用性低下的问题,并对系统的体系结构、插件机制、插件与平台交互、测土施肥功能模块等关键技术进行了深入剖析,依此技术为基础实现了基于插件技术的测土施肥决策系统实例,验证了该技术框架的优越性和可行性.     

基于OSGi插件化的应用框架

OSGi规范描述了一个组件化、动态的服务插件开发平台。在OSGi服务平台中,开发人员通过开发插件为用户提供所需要的功能,这些插件可以动态加载和卸载,或者根据需要远程下载和升级。本文提出了一个以OSGi框架为核心,加入db4o、SWT/JFace等组件构成一个插件化的应用开发框架,展示了基于OSGi框架开发插件化应用的框架。     

B2C电子商务商品定价模型的研究与设计

网上商城中汇集了大量商品的价格信息,如何有效地收集、整理和分析这些价格信息,并提供给不同类型的用户使用是一个值得探讨的问题.通过对网上商城价格信息的研究,在系统总结网上商城中价格信息诸多特点的基础上,提出一种新的网上商城的参考价定价模型;并基于数据驱动,以模板视图控制器(model view controler,MVC)为基本构架,使用fusioncharts插件形象地描述参考价趋势图,为用户的购买决策提供了参考依据.     

基于TLA的Kerberos协议符号化与检测

Leslie Lamport提出的一种新逻辑:行为时序逻辑TLA(Temporal Logic of Actions),它能在一种语言中同时表达模型程序与逻辑规则。AVISPA是基于行为时序逻辑的用HLPSL语言编程的协议安全检测工具。文中提出对Kerberos协议角色化,然后用AVISPA工具对HLPSL编码进行检测,结果表明用基于TLA的检测工具是宜于使用且有效的。     

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.     

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.     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with