基于事例推理的中文垃圾邮件过滤

分析现有垃圾邮件过滤分类算法的不足,根据垃圾邮件的概念漂移特性,提出了一种基于CBR的垃圾邮件过滤算法.针对中文垃圾邮件特点提取特征,设计基于CRN网络的实例检索算法,该算法增加了预计算阶段,从而提高检索速度.实验结果表明,与传统贝叶斯算法相比,该算法对于动态变化的中文垃圾邮件数据集有更好的过滤效果.     

部分耗尽SOI NMOSFET总剂量辐照的最坏偏置

通过模拟对ON、OFF、TG三种偏置下PD SOI NMOSFET的总剂量辐照效应进行了研究.模拟发现正沟道的最坏偏置是ON偏置,背沟道的最坏偏置与总剂量有关.当总剂量大时,背沟道的最坏偏置是OFF偏置;当总剂量小时则是TG偏置.而NMOSFET的最坏偏置则取决于起主要作用的是正栅还是背栅.由于辐照产生电子空穴对的过程与电场分布强相关,通过分析不同偏置下电场分布的差异确定最坏偏置的内在机制.     

Identification of Raman spectra through a case‐based reasoning system: application to artistic pigments

This paper presents a methodology conceived as a support system to identify unknown materials by means of the automatic recognition of their Raman spectra. Initially, the design and implementation of the system were framed in an artistic context where the Raman spectra analyzed belong to artistic pigments. The analysis of the pigmentation used in an artwork constitutes one of the most important contributions in its global study. This paper proposes a methodology to systematically identify Raman spectra, following the way analysts usually work in their laboratory but avoiding their assessment and subjectivity. It is a three‐phase methodology that automates the spectral comparison, which is based on one of the most powerful paradigms inmachine learning: the case‐based reasoning (CBR) systems. A CBR system is able to solve a problem by using specific knowledge of previous experiences (well‐known spectral library of patterns) and finding the most similar past cases (patterns), reusing and adapting them to the new problem situation (unknown spectrum). The system results in a global signal processing methodology that includes different phases such as reducing the Raman spectral expression by means of the principal component analysis, the definition of similarity measures to objectively quantify the spectral similarity and providing a final value obtained by a fuzzy logic system that will help the analyst to take a decision. The major benefit of a Raman spectral identification system lies in offering a decision‐support tool to those who are not experts or under difficult situations with respect to Raman spectroscopy. Copyright © 2011 John Wiley & Sons, Ltd.     

MCM Test Strategy Synthesis from Chip Test and Board Test Approaches

Chip test practices such as functional test and Bist, and their relevance to MCM testing are summarized. Drawbacks of using these techniques, for some MCMs, are presented.Board test practices such as in-circuit test andboundary-scan, are summarized; the advantages of incorporating boardtest techniques for certain MCMs are given. Test strategies arecategorized and compared. Appropriate MCM test equipment isdiscussed. Examples of using chip, board, and hybrid test approachesare then given.     

INTERACTIVE TEACHING DESIGN AND IMPLEMENTATION FOR MATERIALS MECHANICS BASED ON CASE LIBRARY CONSTRUCTION 1)

材料力学案例库建设,以知识点、情景和问题为案例三要素,整合了教师开发、毕业生推荐、在校生选编等案例资源。基于案例库的教学设计是以能力培养为目标,以培养学生发现问题、分析问题、解决问题的能力为主线,以强化实践意识和安全意识为两翼。教学实施针对不同专业背景和学科差异,通过课前精选案例、课中互动讨论及课后交流分享,借助互联网技术应用,积极开展"指尖上的力学"教学,促进线上线下资源共享、课内课外师生互动、问题分析和问题解决深度融合,实现了教与学的相互促进。     

Differential Scanning Calorimetry and Hydrodynamic Study of Bacterial Viruses. About possible heat effects in hermetically closed calorimetric vessels with free volume above the liquid

The phase transitions occurring in aqueous solutions of macromolecules and their complex structures (like order-disorder transitions in proteins or nucleic acids solutions) are usually accompanied by small changes in their specific partial volumes. If the quantity of these substances in the closed calorimetric vessels is relatively large (few mg) and if the phase transition is accompanied by a high change of specific partial volume (like in solution of bacteriophages),it is possible to detect some imaginary heat effects in the DSC calorimeters which have closed (sealed) vessels with free volume above the liquid. This revised version was published online in July 2006 with corrections to the Cover Date.     

A statistically important Gaussian Process

It is well known, that under the condition LAN and some more regularity conditions, the process of log-likelihood functions converges weakly to a degenerate Gaussian process (the trajectories of which are straight lines). In the non-regular case considered by several authors [1, 9] the limiting process is non-degenerate and characterized by the covariance function $\text{R(t,s) =}\text{1}\text{2}\text{(|t|}{}^{\mathrm{p}}\text{+ |s|}{}^{\mathrm{p}}\text{? |t ? s|}{}^{\mathrm{p}}\text{)}$. In the present paper, we derive sever properties of this process with relevance to applications in statistics.In particular, a bound for the risk of equivariant estimates is given and the maximum likelihood estimate (MLE) is shown to be well defined. The calculation of the exact distribution of the MLE is left as an open problem.     

Stochastic integral equations applied to telecommunications traffic without delay

Modern telecommunication techniques case the problem of traffic handling in the framework of fairly general networks, as applied to traffic without delay but with virtually arbitrary service-time distributions. In this paper we use stochastic integral equations to deal with the case involving the most general input process and lost calls. For this purpose, Fortet's equation, unsolved so far in the general case, is solved to analyze the single trunk group model. The stationary case is then treated as a special case. Finally we study networks which satisfy a certain assumption of symmetry. The same general stochastic assumptions are maintained throughout the paper.     

实时软件测试用例构造方法研究

航空与国防领域正呈现实时软件密集的趋势。这些软件可靠性要求高且通常规模较大，测试是一项艰巨的工作。如何使测试做到充分且必要是十分重要的研究课题．本文在分析实时软件特征的基础上，针对程序正确性测试，从任务组合和等价类划分两个主要环节探讨了测试用例构造的克要策略，并举出一具体实例。