NTFS文件系统剖析

针对Windows操作系统所使用的NTFS与FAT文件系统的簇、容量、安全、字符集等,分析了两种文件系统的区别与优缺点.分析了NTFS文件系统使用的数据结构,特别针对其主控文件表MFT、MFT记录、文件结构、目录结构进行了深入的剖析,给出了NTFS文件系统中文件与目录的MFT记录结构.     

基于MapReduce的增量数据挖掘研究

频繁项集挖掘是数据挖掘过程中的重要部分,传统数据挖掘算法中常用Apriori算法和FP增长算法来挖掘频繁项集。在实际应用中,传统算法往往不能用于频繁更新的数据库,采用IMBT数据结构能从不断更新的数据库中挖掘频繁项集,但是这将导致存储空间不足和运行效率低下的问题。基于MapReduce的增量数据挖掘能够有效解决这些问题,通过对比基于MapReduce的增量数据挖掘和传统增量数据挖掘的运行时间可以证明,基于Mapeduce的增量数据挖掘更高效。     

基于JTAG接口的YAFFS文件系统

基于JTAG接口实现YAFFS文件系统是一种崭新的设计思路。以MTD子系统的结构为基础,抽象出MTD设备层,专注于MTD芯片驱动程序的设计,给上层YAFFS文件系统提供了统一的操作接口。在此基础上实现的基于JTAG接口的MTD驱动程序结构,不仅支持C＊Core平台和YAFFS文件系统,而且经过简单移植可以扩充到ARM等平台和FAT等文件系统,具有非常好的开放性和适应性。     

Linux虚拟文件系统分析

首先简要地介绍Linux系统中虚拟文件系统（VFS）的分层抽象,然后详细分析VFS通用模型中的四个对象类型及内核中实现它们的数据结构,最后介绍它们之间是如何联系起来的。通过对其分析,使读者加深对VFS系统的理解。     

ZFS文件系统Snapshot技术的分析

快照是一种重要的存储数据的技术,可以在不停止应用程序的情况下对数据进行备份。本文对Solaris平台下的ZFS文件系统中的快照技术进行了分析,介绍了快照的工作原理、实现技术及数据结构,并在ZFS中进行快照创建、数据恢复的实例分析,结果表明ZFS文件系统中的快照技术能避免数据的丢失,可以有效地保护该系统下的数据,并且在操作系统的实验教学中对文件系统的分析具有较大的实践意义。     

使用冗余数据设计树型关系的数据结构

关系数据库设计时要遵守设计范式,要尽可能减少数据的冗余度,以使结构更合理,消除存储异常。但在具体的数据库设计实践中采用恰当的范式等级,适当的使用冗余数据,可以达到更好的使用效果。本文通过示例介绍了数据库设计案例中的树型关系的数据结构的设计,说明数据库设计中正确使用冗余数据的好处。     

多处理机环境下UNIX文件系统的设计和实现

本文论述了在多处理机环境下UNIX 文件系统的设计和实现,以保证文件系统运行的正确性和极大限度地开发信息处理的并发性。文中提出多处理机UNIX 文件系统的模型、结构及特点。着重论述多处理机UNIX 文件系统主要数据结构低层缓冲区和内部其他数据结构的组织和管理。最后论述了多处理机环境中出现的数据一致性问题。     

Linux虚拟文件系统实现技术探讨

文章论述了Linux文件系统的逻辑关系和逻辑结构，对VFS中几个主要的数据结构进行了分析，剖析了Linux文件系统中一个物理文件系统的安装与注册、VFS的产生，以及通过VFS管理和访问物理文件系统的内核工作机制。     

Linux操作系统的文件系统建立过程的研究

Linux文件系统的建立过程包括文件系统的注册和安装。该文深入研究了Linux文件系统的注册和注销、安装和卸载过程,并详细分析了整个过程中采用的数据结构,以及文件系统建立的整体结构。     

NTFS文件系统的主要数据结构

文章分析了NTFS文件系统的主要数据结构。从编写直接操作NTFS文件系统程序所需的知识出发,给出了NTFS文件系统中主要的数据结构,并对数据结构中的主要成员给出了详细的说明。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.