Case-Base Maintenance in a Multimodal Reasoning System

The definition of suitable case-base maintenance policies is widely recognized as a major key to success for case-based systems; underestimating this issue may lead to systems that either do not fulfill their role of knowledge management and preservation or that do not perform adequately under performance dimensions, namely, computation time and competence and quality of solutions. The goal of this article is to analyze some automatic case-base management strategies in the context of a multimodal architecture combining case-based reasoning and model-based reasoning. We propose and compare two different methodologies, the first one, called replace , is a competence-based strategy aimed at replacing a set of stored cases with the current one, if the latter exhibits an estimated competence comparable with the estimated competence of the considered set of stored cases. The second one, called learning by failure with forgetting (LFF), is based on incremental learning of cases interleaved with off-line processes of forgetting (deleting) cases whose usage does not fulfill specific utility conditions. Results from an extensive experimental analysis in an industrial plant diagnosis domain are reported, showing the usefulness of both strategies with respect to the maintenance of suitable performance levels for the target system.     

用于准二维移动容迟容断网络的实时资源分配策略

资源分配是移动容迟容断网络的核心问题之一,影响着容迟容断网络路由甚至整个系统的效率.然而目前移动容迟容断网络的资源分配策略大多基于神经网络和遗传算法的混合算法,计算量大,不利于实时应用.为此根据移动网络可预测环境,提出了接入路由器消息矩阵及准二维接入带宽的约束条件,在此基础上建立了基于效用函数的资源分配策略,以满足实时要求.算法具有O(n)的算法复杂度,仿真结果显示切换掉话率和新呼叫阻塞率仅比最优化算法升高约1/4,计算用时则只有其36.99％.说明其在保证实时性的前提下仍能提供较好的QoS.算法可以进一步推广到二维移动场景中.     

Utility accrual real-time scheduling for multiprocessor embedded systems

We present the first Utility Accrual (or UA) real-time scheduling algorithm for multiprocessors, called the global Multiprocessor Utility Accrual scheduling algorithm (or gMUA). The algorithm considers an application model where real-time activities are subject to time/utility function time constraints, variable execution time demands, and resource overloads where the total activity utilization demand exceeds the total capacity of all processors. We consider the scheduling objective of (1) probabilistically satisfying lower bounds on each activity’s maximum utility, and (2) maximizing the system-wide, total accrued utility. We establish several properties of gMUA including optimal total utility (for a special case), conditions under which individual activity utility lower bounds are satisfied, a lower bound on system-wide total accrued utility, and bounded sensitivity for assurances to variations in execution time demand estimates. Finally, our simulation experiments validate our analytical results and confirm the algorithm’s effectiveness.     

"When your top choice turns you down: Effect of rejected offers on the utility of selection tests": Correction to Murphy.

Reports an error in "When your top choice turns you down: Effect of rejected offers on the utility of selection tests" by Kevin R. Murphy (Psychological Bulletin, 1986[Jan], Vol 99[1], 133-138). There was an error in the last line of Table 1, which appears on page 137. The corrected version is presented in the erratum. (The following abstract of the original article appeared in record 1986-15964-001.) Develops formulas for calculating the average ability of job candidates actually selected when the proportion of initial offers accepted is less than 100%. Three cases are considered: (a) those in which offers are declined at random, (b) those in which offers are declined by the highest-scoring applicants, and (c) those in which test scores are related to the probability of accepting an offer. It is shown that under realistic circumstances, utility formulas currently used could overestimate utility gains by 30–80% and that, under extreme circumstances, overestimation could be much worse. Such overestimation occurs even when tests are used only for screening rather than for rank-ordering candidates. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

住宅给排水设计中易忽视的若干问题

针对住宅给排水设计的重要性，详细地介绍了厨房和卫生间的排水管道设计、管位及PVC管使用功能设计中应注意的细节问题，同时就给排水设计及安装的其他问题进行了探讨，以完善住宅给排水设计，从而达到优化和完善住宅的目的。     

CALCULATION OF FUZZY RELIABILITY IN THE CASE OF RANDOM STRESS AND FUZZY FATIGUE STRENGTH

0 INTRODUCTIONFatigUe Performance data Of metal material is the basic data for the fatigUe reliability design ofmechanical elements or systems. Because fatigUe test data has large scatter, to obtain the accuse oh Ncurve, much experimental data should be collected. HOweVer, only a small amount of sample data isavailable due to the eXPerimental costS or difficulty of collection. The following relationship Eq. (l )acqUired from a saal amount data POint(N, d ) is often imp~ise and a lea…     

大型电站锅炉刚性梁的挠度分析

详细介绍了大型电站锅炉刚性梁挠度分析的计算方法。     

劣质粉煤利用途经及气化工艺

随着煤炭资源的日益减少，和人类对环保要求逐步提高，高效洁净的利用劣质粉煤越来越受到重视。本文论述了劣质粉煤的各种利用途经，特别是对适应当前煤化工发展的大规模利用劣质粉煤的气化技术做了评述，指出了存在的问题及解决途径。     

关于城际轨道站场周边地区规划的研究

通过对国内外城市轨道的考察,总结出城市轨道交通对沿线土地利用的影响规律,结合对客源构成特征的分析,提出了站场核心区、次区域和协调好区域的三级圈层结构,以协调好各种交通设施的布置和城市景观规划。     

我国固体废弃物的现状及存在的问题

对我国固体废弃物的种类及存量进行了研究,详细地介绍了各种固体废弃物再生利用的现状,分析了我国固体废弃物应用技术中存在的不足,以促进我国固体废弃物的利用,从而为我国可持续发展战略做出贡献。