基于规则引擎的智能决策支持系统开发

提出了解决基于规则专家系统的规则冲突的方法。构建了使用Eclipse和Drools的集成开发环境。     

支持JSR286和WSRP2.0规范的Portlet协作的设计

JSR286规范定义了本地Portlet之间的协作方式,WSRP2.0规范定义了远程Portlet之间的协作方式,但两者并未深入涉及远程Portlet和本地Portlet之间的协作问题,降低了Portlet的交互能力。针对这点不足,在WSRP2.0规范定义的事件分发及状态分发等协作机制基础上,设计了一个消费者门户主导的联邦协作框架。在该框架中,通过协作信息转换和协作服务作为中介,通过消息队列进行消息存储、消息验证和消息处理,实现了Portlet容器和代理容器的松散耦合,并支持远程Portlet和远程Portlet之间、远程Portlet和本地Portlet之间、本地Portlet和本地Portlet之间的协作。该框架与JSR286规范和WSRP2.0规范兼容,满足WSRP2.0模块的可插拔性,并具有良好的可扩展性和可移植性。     

A hybrid positioning system for technology‐independent location‐aware computing

Location‐aware computing is a form of context‐aware mobile computing that refers to the ability of providing users with services that depend on their position. Locating the user terminal, often called positioning, is essential in this form of computing. Towards this aim, several technologies exist, ranging from personal area networking, to indoor, outdoor, and up to geographic area systems. Developers of location‐aware software applications have to face with a number of design choices, that typically depend on the chosen technology. This work addresses the problem of easing the development of pull location‐aware applications, by allowing uniform access to multiple heterogeneous positioning systems. Towards this aim, the paper proposes an approach to structure location‐aware mobile computing systems in a way independent of positioning technologies. The approach consists in structuring the system into a layered architecture, that provides application developers with a standard Java Application Programming Interface (JSR‐179 API), and encapsulates location data management and technology‐specific positioning subsystems into lower layers with clear interfaces. In order to demonstrate the proposed approach we present the development of HyLocSys. It is an open hybrid software architecture designed to support indoor/outdoor applications, which allows the uniform (combined or separate) use of several positioning technologies. HyLocSys uses a hybrid data model, which allows the integration of different location information representations (using symbolic and geometric coordinates). Moreover, it allows support to handset‐ and infrastructure‐based positioning approaches while respecting the privacy of the user. The paper presents a prototypal implementation of HyLocSys for heterogeneous scenarios. It has been implemented and tested on several platforms and mobile devices. Copyright © 2009 John Wiley & Sons, Ltd.     

基于J2ME的Web服务客户端及其在移动设备中的实现

介绍Web服务的现状和J2ME在Web服务客户端中的应用，然后详细讨论利用J2ME在手持移动设备上访问Web服务的两种实现方法，并通过实验验证这两种方法的可行性，最后比较了这两种实现方法的优缺点。     

Interpreting chemical kinetics from complex reaction–advection–diffusion systems: Modeling of flow reactors and related experiments

The present discourse is directed toward the community that wishes to generate or use flow reactor data from complex chemical reactions as kinetic model development and validation targets. Various methods for comparing experimental data and computational predictions are in evidence in the literature, along with limited insights into uncertainties associated with each approach. Plug flow is most often assumed in such works as a simple, chemically insightful physical reactor model; however, only brief qualitative justifications for such an interpretation are typically offered. Modern tools permit the researcher to quantitatively confirm the validity of this assumption. In a single complex reaction system, chemical time scales can change dramatically with extent of reaction of the original reactants and with transitions across boundaries separating low temperature, intermediate temperature, and chain branched (high temperature) kinetic regimes. Such transitions can violate the underlying assumptions for plug flow interpretation. Further, uncertainties in reaction initialization may confound interpretation of experiments for which the plug flow assumption may be appropriate. Finally, various methods of acquiring experimental data can also significantly influence experimental interpretations. The following discussions provide important background for those interested in critically approaching the relatively vast literature on the application of flow reactors for generating kinetic validation data. The less frequently discussed influences of reactor simulation assumptions on modeling predictions are addressed through examples for which the kinetic behavior of specific reactant combinations may cause experimental observations to depart locally from plug flow behavior.     

基于提升静态小波变换与联合结构组稀疏表示的多聚焦图像融合

为抑制传统小波变换在多聚焦图像融合中产生的伪吉布斯现象,以及克服传统稀疏表示的融合方法容易造成融合图像的纹理与边缘等细节特征趋于平滑的缺陷,提高多聚焦图像融合的效率与质量,采用一种基于提升静态小波变换（LSWT）与联合结构组稀疏表示的图像融合算法。首先对实验图像进行提升静态小波变换,根据分解后得到的低频系数与高频系数各自不同的物理特征,采用不同的融合方式。选择低频系数时,采用基于联合结构组稀疏表示的系数选择方案;选择高频系数时,采用方向区域拉普拉斯能量和（DRSML）与匹配度相结合的系数选择方案。最后经逆变换重构得到最终融合图像。实验结果表明,改进的算法有效地提高了图像的互信息量、平均梯度等指标,完好地保留图像的纹理与边缘等细节信息,融合图像效果更好。     

机载SAR有源干扰分析与比较

机载合成孔径雷达的干扰是当前电子对抗领域关注的焦点问题.在首先介绍了几种常用的SAR有源干扰方法的基础上,重点阐述了相干干扰的工作原理.然后,从压制系数出发,推算出了达到SAR压制系数条件下,不同干扰方式的功率表达式.结合仿真结果,对不同干扰方法的干扰性能进行了评估和比较.最后,针对各种干扰方法的性能优缺点,提出了综合运用多种方法对机载SAR进行有源干扰的作战策略.对机载SAR有源压制干扰的作战应用具备一定的指导意义.     

A jet-stirred reactor and kinetic modeling study of ethyl propanoate oxidation

A jet-stirred reactor study of ethyl propanoate, a model biodiesel molecule, has been carried out at 10 atm pressure, using 0.1% fuel at equivalence ratios of 0.3, 0.6, 1.0 and 2.0 and at temperatures in the range 750-1100 K with a constant residence time of 0.7 seconds. Concentration profiles of ethyl propanoate were measured together with those of major intermediates, ethylene, propanoic acid, methane and formaldehyde, and major products, water, carbon dioxide and carbon monoxide. This data was used to further validate a previously published detailed chemical kinetic mechanism, containing 139 species and 790 reversible reactions. It was found that this mechanism required a significant increase in the rate constant of the six-centered unimolecular elimination reaction which produces ethylene and propanoic acid in order to correctly reproduce the measured concentrations of propanoic acid. The revised mechanism was then used to re-simulate shock tube ignition delay data with good agreement observed. Rate of production and sensitivity analyses were carried out under the experimental conditions, highlighting the importance that ethylene chemistry has on the overall reactivity of the system.     

Experimental and chemical kinetic modeling study of small methyl esters oxidation: Methyl (E)-2-butenoate and methyl butanoate

This study examines the effect of unsaturation on the combustion of fatty acid methyl esters (FAME). New experimental results were obtained for the oxidation of methyl (E)-2-butenoate (MC, unsaturated C₄ FAME) and methyl butanoate (MB, saturated C₄ FAME) in a jet-stirred reactor (JSR) at atmospheric pressure under dilute conditions over the temperature range 850-1400 K, and two equivalence ratios (Φ=0.375,0.75) with a residence time of 0.07 s. The results consist of concentration profiles of the reactants, stable intermediates, and final products, measured by probe sampling followed by on-line and off-line gas chromatography analyses. The oxidation of MC and MB in the JSR and under counterflow diffusion flame conditions was modeled using a new detailed chemical kinetic reaction mechanism (301 species and 1516 reactions) derived from previous schemes proposed in the literature. The laminar counterflow flame and JSR (for ?=1.13) experimental results used were from a previous study on the comparison of the combustion of both compounds. Sensitivity analyses and reaction path analyses, based on rates of reaction, were used to interpret the results. The data and the model show that MC has reaction pathways analogous to that of MB under the present conditions. The model of MC oxidation provides a better understanding of the effect of the ester function on combustion, and the effect of unsaturation on the combustion of fatty acid methyl ester compounds typically found in biodiesel.     

企业信息门户关键技术研究

详细介绍了作为企业信息门户关键技术的两个规范,它们是JSR 168和远程Portlets Web服务（Web Services for Remote Portlets,WSRP）,并对两者的关系作了阐释。这两个规范使基于不同平台的门户能够无缝地互操作成为了可能,同时使大范围内基于用户的信息集成更加快速安全。