AOP在BPEL服务组合中的应用的研究

为了解决BPEL语言对横切关注点建模的缺乏和动态演化方面的不足,文中提出一种把协调策略附加到BPEL伙伴链接和作用域上,在部署时对参与业务过程事务的伙伴服务支持的协调类型进行验证,保证业务过程需要的协调类型被参与者支持。同时,引入了面向方面编程（Aspect Oriented Programming,AOP）的思想,分离事务需求横切关注点,通过利用现有的支持动态织入的BPEL引擎等相关技术,使得事务管理需求能够在运行时动态地织入,并且能够在伙伴服务或者是业务过程改变时实现动态的修改。     

动态服务流程模型混合分割方法及应用

为统一跨组织之间的服务流程定制问题,提出了基于高级Petri网的动态服务流程模型混合分割方法,将一个全局的BPEL模型分割为若干个完备的执行分片,根据组织的不同,分别放置在多个BPEL引擎上协同执行,在此基础上进行了模型混合分割的正确性验证.通过示例验证了BPEL流程模型混合分割执行的可行性,最后结合示例给出了支持模型混合分割的原型系统.仿真结果表明:动态服务流程模型混合分割方法支持下的多个BPEL引擎分布式执行比集中式BPEL引擎的集中编制有明显的优势,从而提高了服务流程引擎的吞吐率,也减少了服务响应时间的花费.     

服务组合中基于执行性能评价模型的人工任务调度方法

针对服务组合中人工任务的执行问题,给出了一个支持人工任务的组合服务执行引擎.该执行引擎将人工任务作为BPEL中的一个活动,并通过人工服务容器实现人工服务资源对人工任务的执行,能够保证人工服务资源与业务流程间的松散耦合.同时,针对人工任务的执行效率保证问题,建立了包括执行效率、负载均衡以及可靠性等性能指标的人工服务资源执行性能评价模型,以客观地反映人工服务资源任务执行的实际效果.在该模型的基础上,给出了人工任务调度问题的目标函数,并提出了基于执行性能评价模型的人工任务调度算法.实验结果验证了所提出的人工任务调度方法的有效性.     

支持跨企业协作的应用集成模型研究

在实现跨企业数据交换和业务流程管理的基础上,研究设计一种跨企业的应用集成模型.该模型基于XML、Web Services与工作流技术,采用三层体系结构;每个企业的公共应用都被封装成Web Services;企业间的数据交换及Web Services间的交互通过SQAP消息机制实现;采用商业流程执行语言(BPEL4WS)对跨企业Web服务进行有效的组织和集成,并在此基础上进行适当扩展,通过引入“服务容器”的概念,用于表示一组具有相同端口类型与操作的服务,以支持服务的选择和替换机制.最后对引擎调度策略问题进行了讨论.     

基于SPIN的BPEL4WS建模与验证研究

Web服务组合研究领域的一个重要问题是如何形式化描述Web服务组合,验证服务组合的正确性,Web服务组合的形式化模型可以用来检查和验证Web服务组合以保证组合的正确性.文章使用模型检查工具SPIN对目前普遍使用的Web服务组合规范BPEL4WS (Business Process Execution Language for Web Services,Web服务业务流程执行语言)模型进行了验证,给出了BPEL4WS语法到Promela形式化模型的转换方法,最后通过一个实例对BPEL4WS表示的服务组合模型的安全性、活性和有界性等特性进行了验证分析,从而给出了基于SPIN的BPEL4WS表示的Web服务组合模型验证的方法.     

一个基于Web的工作流系统的体系结构

针对目前的工作流管理产品缺少对异构、分布应用的有效支持 ,缺少足够的可靠性和可扩展性 ,作者近期设计了一个基于Web的工作流管理原型系统WFlow 在该系统中通过引入工作流分层模型和嵌套分布执行机制 ,增强了系统对异构、分布应用的支持力度 ,提高了系统的可靠性 文中着重讨论其体系结构 ,其中包括工作流模型、工作流引擎和多引擎间的协调机制等     

一种面向服务的协同工作流设计

在对基于SOA的工作流进行扩展的基础上,进一步考虑对人工参与的支持,并提出一种基于服务组合工作流模型的辅助决策系统架构。首先扩展了BPEL以描述抽象工作流,并支持人工任务的参与,然后参考OWL-S语言和技术实现服务的动态组装和分配,最后提出一种人机融合的机制描述了工作流的执行机理。     

一个基于Web的工作流系统的体系结构

针对目前的工作流管理产品缺少对异构、分布应用的有效支持,缺少足够的可靠性和可扩展性,作者近期设计了一个基于Web的工作流管理原型系统WFlow,在该系统中通过引入工作流分层模型和嵌套分布执行机制,增强了系统对异构、分布应用的支持力度,提高了系统的可靠性,文中着重讨论其体系结构,其中包括工作流模型、工作流引擎和多引擎间的协调机制等。     

基于MDA的SOA服务协作模型

BPEL是业务流程执行语言用来描述SOA的服务协作模型,实现对已有系统业务流程的编排.但其随着整合已有系统的增多和业务流程复杂性的增加,BPEL建模也变得异常复杂.本文给出了一种基于MDA模型驱动转换的方法来建立SOA服务协作模型.针对建立SOA服务协作模型的复杂性,在平台无关层建立UML活动图描述服务协作模型的交互过程,通过建立模型之间的映射规则,将平台无关层模型自动转换到平台相关层BPEL模型,试验表明:该方法能较好地简化SOA服务协作模型的建立过程.     

基于BPEL的网格工作流系统

设计并实现了一个基于业务流程执行语言(business process execution language,BPEL)的网格工作流管理系统.针对满足网格环境中的特殊需求,如状态的交互、动态服务绑定、高吞吐量和可扩展性、界面友好的工作流定义工具等,分别提出了BPEL与Web服务资源框架(Web service resource framework,WSRF)整合方法、BPEL的简单集群架构和面向应用组件的工作流定义等.最后,给出了在中国教育科研网格公共支撑平台(ChinaGrid supporting platform,CGSP)中网格工作流系统的原型实现.实验结果表明,原型系统支持负载均衡是正确、可行和有效的.     

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.     

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.     

A computer generator for randomly layered structures

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

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。     

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     

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     

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

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.