非马尔可夫非线性双态噪声驱动系统的MFPT

本文运用随机轨道技术,解决了一般非线性双态噪声的平均第一通过时间(简称为MFPT)问题.利用最陡下降法简化所得结果,处理了具有非线性漂移的随机系统的MFPT问题.通过数值计算,求出了双稳系统的MFPT.作图比较了线性双态噪声和平方双态噪声的MFPT,得到了若干有意义的结论.     

数学建模的层次分析法

阐述了数学建模层次分析法的基本思想、方法和核心问题，运用层次分析法建立数学模型的一般步骤和计算方法，并通过实例分析，说明了层次分析法在决策中的有效性．     

基于跳-扩散过程的振动系统的模态识别方法(英文)

本文提出了Lévy激励下LTI系统的一种时域模态识别方法.系统响应可看做是一个跳-扩散过程.基于二次变差和多幂次变差的性质,跳-扩散过程被分解成扩散过程和纯跳激励的过程,二者都具有和原系统相同的未知参数.最后通过扩散过程的极大似然估计方法来估计Lévy激励下LTI系统的参数.数值结果表明该方法估计精度高.     

LTE-A/WLAN中基于马尔可夫过程的接入选择算法研究

在LTE-A/WLAN融合的异构网络中,为了随时随地为用户提供最好的连接,文中提出了一种基于马尔可夫过程的接入选择算法.当不同业务类型的用户到达这两个网络重叠覆盖的区域时,该算法根据当前各接入网的网络状态和用户业务类型做出相应的接纳控制决策,包括是否接纳该用户以及接纳到何种网络,通过仿真和采用马尔可夫过程分析该异构网络的系统性能,证明了该算法能够有效提高该异构网络系统的吞吐量,降低阻塞概率,改善异构网络中无线资源的利用率.     

35 ka BP climate simulations in East Asia and probing the mechanisms of climate changes

Interglacial or postglacial climates are all of charac-teristic of warmer conditions. However, if condition asso-ciated with the warm feature is wetter or drier than today,it would produce different impacts on natural environ-ments and human society. Quaternary studies found thatclimate with warm-dry or warm-wet conditions had oc-curred in China during the last 40—30 ka BP[1]. For ex-ample, it was warmer than the present during themid-Holocene (3—8 ka BP) and the late phases of MarineIsot…     

Particle methods for multiscale simulation of complex flows

The multi-scale structures of complex flows have been great challenges to both theoretical and engineering researches, and multi-scale modeling is the natural way in response. Particle methods (PMs) are ideal constitutors and powerful probes of multi-scale models, owing to their physical insight and computational simplicity. In this paper, the role of different PMs for multi-scale modeling of complex flows is critically reviewed and possible development of PMs in this background is prospected, with the emphasis on pseudo-particle modeling (PPM). The performances of some different PMs are compared in simulations and new development in the fundamentals and applications of PPM is also reported, demonstrating PPM as a unique PM for multi-scale modeling.     

Integration Between Enterprise Process Monitoring and Controlling System and Enterprise Application

The relationships and the features of integration between Enterprise Process Monitoring and Controlling System (EPMCS) and Enterprise Process Related Applications (EPRA) were analyzed. An integration architecture centered on EPMCS was presented, in which there were four layers to conneet from EPMCS to EPRA: EPMCS, application integration layer, transport layer and EPRA, and there were four layers used to etstablish integration: presentation layer, function layer, data layer and system layer. The frameworks to connect EPMCS and EPRA were designed, that Enterprise-Independent Model (ELM), Enterprise-Specific Model (ESM) and metamodel to describe these two models were defined. The method to integrate data based on XML was designed to exchange data from EPMCS to EPRA according to the mapping between EIM and ESM. The approches are suitable for integrating EPMCS and systems in Product Data Management (PDM), project management and enterprise business management.     

多工序过程自相关数据的统计监测

结合状态空间模型和统计过程控制方法,建立了多工序生产过程中的自相关数据控制图,给出了平均运行长度的计算公式,并采用Matlab软件模拟实际生产过程所产生的自相关数据.同时,通过生产实例,演示了此方法的应用步骤.结果表明,所建立的自相关数据控制图在受控状态下的报警率很低,而在失控状态下的报警率较高.     

复合添加法制取糠醛产品萃取分离溶剂的性能与影响

采用溶剂萃取法分离和精制复合添加法由稻草、麦杆等制取的糠醛 ,研究了氯仿、1,2 -二氯乙烷、三氯乙烯、乙酸乙酯、四氯化碳等不同有机溶剂的萃取效果和物性 同时 ,对影响萃取效果的其他因素进行了分析 实验结果表明 ,对糠醛的萃取率氯仿最高 ,其次是 1,2 -二氯乙烷 ;影响萃取效果的主要因素是被萃液的酸度 图 5,表 1,参 6     

并行计算机互连网络虫孔寻径通信方式的分析建模

采用生灭过程理论建立并行计算机互连网络虫孔寻径的消息延迟分析模型 ,用于对各种并行计算机互联网络进行分析评价 .分析了模型中网络通道的消息到达率和通道消息密度的关系 ,描述了消息传输延迟、消息在结点的等待时间以及消息在通道间的分布密度的数学关系 .与一般排队论分析模型相比 ,该模型对系统的假设更为实际 ,对网络通信过程的描述更为具体 ,因而分析结果与实际情况更加接近 .分析计算结果与软件模拟结果吻合