一种基于多种资源的负载平衡算法的设计与模拟

系统资源的有效利用是集群系统的关键问题，负载平衡是实现资源有效利用的重要手段。本文中，我们提出了一种基于资源使用率和向量负载指数的、采用进程迁移机制的负载平衡算法，并通过踪迹驱动的方法进行了大量的模拟和分析。     

Assessing heterogeneity in meta-analysis: Q statistic or I2 index?

In meta-analysis, the usual way of assessing whether a set of single studies is homogeneous is by means of the Q test. However, the Q test only informs meta-analysts about the presence versus the absence of heterogeneity, but it does not report on the extent of such heterogeneity. Recently, the I2 index has been proposed to quantify the degree of heterogeneity in a meta-analysis. In this article, the performances of the Q test and the confidence interval around the I2 index are compared by means of a Monte Carlo simulation. The results show the utility of the I2 index as a complement to the Q test, although it has the same problems of power with a small number of studies. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Applied genetic evaluations for production and functional traits in dairy cattle

The objective of this study was to review the current status of genetic evaluation systems for production and functional traits as practiced in different Interbull member countries and to discuss that status in relation to research results and potential improvements. Thirty-one countries provided information. Substantial variation was evident for number of traits considered per country, trait definition, genetic evaluation procedure within trait, effects included, and how these were treated in genetic evaluation models. All countries lacked genetic evaluations for one or more economically important traits. Improvement in the genetic evaluation models, especially for many functional traits, could be achieved by closing the gaps between research and practice. More detailed and up to date information about national genetic evaluation systems for traits in different countries is available at www.interbull.org. Female fertility and workability traits were considered in many countries and could be next in line for international genetic evaluations.     

大港段六拨油田网状河沉积及储层非均质性研究

大港段六拨油田孔一段枣0油组为网状河沉积。通过岩心和测井数据观察,分析了本区网状河沉积的特征,划分出网状河砂坝、网状河道、网状河叉道、河道间、天然堤和泛滥平原6种沉积微相,并分析了每种微相的沉积和平面展布特征。由于网状河沉积能量较小,岩性细,具有多旋回性,表现为较强的层内、层间非均质性。平面上储层非均质性主要受控于沉积微相。由于网状河相变快,所以本区储层平面非均质性较强。      

塔河油田碳酸盐岩油藏产能特征与储集层类型的相关性

塔河油田4区下奥陶统碳酸盐岩岩溶缝洞型油藏的形成与古风化壳的风化剥蚀有关,该文从油井自然产能变化和试采井见水动态特性,论述了碳酸盐岩油藏产能,试采见水动态及其与储渗类型之见的相关性,结果表明,塔河油田4区奥陶系油藏的储集空间类型,储渗类型具有多亲性和复杂性,且储集层非均质性严重。     

提高SoC设计效率的基于组件方法综述

片上系统本身的异构性和并发性导致了对系统进行统一建模的困难,从而阻碍了设计效率的提高.对现有系统级方法的分析表明:这类方法不能对不同设计之间更加细节的共同特性进行抽象,限制了复用的范围,不能带来设计效率的进一步提高.因此,通过对面向对象设计、软件工程、形式化语义和系统级EDA这4种基于组件方法描述模型及其对复用影响的讨论,确定了系统的刻画特征,采用这些特征来描述片上系统将带来设计效率的提高.     

无线传感器网络的自组织成簇算法

异构传感器网络是一种能量有限且分布不均衡的网络,负载均衡和能量有效是此网络路由算法的一个挑战。现提出的自组织成簇算法能够有效增加传感器网络的稳定周期,算法基于传感器节点的剩余能量和通讯能耗选择适合的簇头节点。与经典的成簇算法LEACH和SET比较,本算法能够更好实现负载均衡,并极大地提高传感器网络的稳定周期。     

企业信息系统中高级发布/订阅层的实现

基于消息的企业应用程序之间的交互越加受到关注，它主要使用发布，订阅机制实现数据（消息）的交换。但是大多数的发布，订阅通知服务均假定在同一命名空间，不支持异构空间的应用之间的数据交换。首先简要描述了用于消息的分布式异构应用程序之间的作为高层发布机制基于概念的方法，然后讨论了设计和应用该发布机制的相关问题，以及如何将该机制集成于J2EE平台的方法。     

一种基于Ontology的数据集成系统

针对异构数据源中实现基于语义的数据集成的需求，采用分层思想，在用户层与实际数据层之间增加一个中间层来屏蔽底层数据的异构，用本体作为公共语义描述工具，建立本体到各数据源的映射规则，设计实现了将基于本体的全局查询转化为基于各数据源的局部查询系统，解决了数据源之间的语义异构问题，其中用OWL表示本体和映射，并研究了系统中的关键技术。     

Enhanced and Differential Capture of Circulating Tumor Cells from Lung Cancer Patients by Microfluidic Assays Using Aptamer Cocktail

Collecting circulating tumor cells (CTCs) shed from solid tumor through a minimally invasive approach provides an opportunity to solve a long‐standing oncology problem, the real‐time monitoring of tumor state and analysis of tumor heterogeneity. However, efficient capture and detection of CTCs with diverse phenotypes is still challenging. In this work, a microfluidic assay is developed using the rationally‐designed aptamer cocktails with synergistic effect. Enhanced and differential capture of CTCs for nonsmall cell lung cancer (NSCLC) patients is achieved. It is also demonstrated that the overall consideration of CTC counts obtained by multiple aptamer combinations can provide more comprehensive information in treatment monitoring.