一种实时心电图数据压缩算法

提出了一种实时心电图ＥＣＧ数据压缩算法。它是将自适应变门限算法与转折点算法相结合。自适应变门限算法是对ＡＺＴＥＣ算法的改进．它计算ＥＣＧ信号的几个统计参数来确定可变门限值。转折点算法是分析采样点的趋势并只存储每对连续的采样点中的一个。它保留信号的斜坡标志发生变化的峰点和谷点。本文算法兼有这两种算法的优点。这种算法在较高压缩比的情况下重建心电图信号失真较小．     

一种新的基于DCT的图象编码法

针对ＪＰＥＧ在高压缩比情况下，解压图象的质量较差，近年来提出了不少改进算法。ＤＣＴ的零树编码（ＥＺＤＣＴ）［１，２］是效果最好的算法之一，但其仍无法克服基于ＤＣＴ的算法所固有的缺点——方块效应。此文提出一种层式ＤＣＴ的零树图象编码方法（ＥＺＬＤＣＴ），与ＥＺＤＣＴ相比，能较好地消除方块效应；并且对复杂的图象（如“Ｂａｒｂａｒａ”，“Ｇｏｌｄｈｉｌ”等），在相同压缩比的情况下有更高的ＰＳＮＲ值。     

两组CDV容限参数的流量强制与成形算法

信元时延变化ＣＤＶ对峰值速率警管有很大的影响，文中首先提出基于通用信元速率算法ＧＣＲＡ（Ｔ，δ）的ＣＤＶ成形算法，该算法能有效地成形ＣＤＶ使之符合ＧＣＲＡ（Ｔ，δ）算法对ＣＤＶ容限的要求；在对ＣＤＶ成形算法分析的基础上，进一步提出了两有ＣＤＶ容限参数的流量强制与成形算法ＴＰ－ＥＳＡ，ＴＰ－ＥＳＡ既能成形ＣＤＶ到任意预设的值，又能防止连接对流量的恶意滥用。文中对算法的实现和操作也进行了研究。     

两级CDV容限参数的流量强制与成形算法

信元时延变化ＣＤＶ对峰值速率警管有很大影响，文中首先提出基于通用信元速率算法ＧＣＲＡ（Ｔ，δ）的ＣＤＶ成形算法，该算法能有效地成形ＣＤＶ使之符合ＧＣＲＡ（Ｔ，δ）算法对ＣＤＶ容限的要求；在对ＣＤＶ成形算法分析的基础上，进一步提出了两级ＣＤＶ容限参数的流量强制与成形算法ＴＰ－ＥＳＡ，ＴＰ－ＥＳＡ既能成形ＣＤＶ到任意预设的值，又能防止连接对流量的恶意滥用。文中对算法的实现和操作也进行了研究。     

WINDOWS 3.1下实时心电监护系统软件的设计

主要介绍在ＷＩＮＤＯＷＳ３．１操作系统下如何编制实时心电监护软件，提出了ＷＩＮ３．１下编写实时硬件中断代码的一般性准则，同时介绍视窗下的心电波形（ＥＣＧ）实时显示、ＱＲＳ波宽的检测，以及一种数字滤波算法等。     

读者评选的最佳产品(前三名)

ＭＰ３ 播放器帝盟Ｒｉｏ　ＰＭＰ　５００ （３６．２％）Ｇｒｕｎｄｉｇ　 ＭＰＡＸＸ ＭＰ１００（１８．５％）富士Ａｘｊａ　 ＦＭＰ－２０００（１６．９％）扫描仪爱克发ＳｎａｐＳｃａｎ １２１２Ｕ（２０．７％）惠普 ＳｃａｎＪｅｔ ５２００Ｃ（１８．１％）爱普生Ｐｅｒｆｅｃｔｉｏｎ １２００Ｕ（１４．９％）数码相机奥林巴斯ＣａｍｅｄｉａＣ３０３０变焦（１７．４％）尼康 Ｃｏｏｌｐｉｘ ９９０（１４．７％）佳能Ｅｕｒｏ－Ｆｏｔｏ　Ｐｏｗｅｒｓｈｏｔ　Ｓ２０（１２．９％）台式机戴尔Ｄｅｌｌ Ｄｉ－ｍｅｎｓｉｏｎ…     

数字语音编解码的一种DSP实现方法

本文针对ＩＴＵ Ｇ．７２８标准语音编解码器,提出了一种ＤＳＰ的实现方法。在简介Ｇ．７２８编解码和ＤＳＰ芯片ＴＭＳ３２０Ｃ５４１基础上,本文主要研究了ＣＥＬＰ（ＬＤ－ＣＥＬＰ）算法在ＴＭＳ３２０Ｃ５４１上的实现和实现此算法的一些关键技术,并给出了实际仿真结果。     

曲面间高阶几何连续拼接算法研究

曲面间高阶几何连续拼接算法研究卢小林，马利庄，何志均（浙江大学ＣＡＤ＆ＣＧ国家重点实验室杭州３１００２７）ＡＮＡＬＧＯＲＩＴＨＭＦＯＲＨＩＧＨＯＲＤＥＲＧＥＯＭＥＴＲＩＣＣＯＮＮＥＣＴＩＯＮＢＥＴＷＥＥＮＡＤＪＡＣＥＮＴＰＡＴＣＨＥＳ￥ＬｕＸｉａｏｌ...     

应用嵌套排序的并行CHOLESKY分解算法

应用嵌套排序的并行ＣＨＯＬＥＳＫＹ分解算法迟学斌（中国科学院计算中心）ＰＡＲＡＬＬＥＬＣＨＯＬＥＳＫＹＤＥＣＯＭＰＯＳＩＴＩＯＮＵＳＩＮＧＮＥＳＴＥＤＤＩＳＳＥＣＴＩＯＮＴＥＣＨＮＯＬＯＧＹ￥ＣｈｉＸｕｅｂｉｎ（ＣｏｍｐｕｔｉｎｇＣｅｎｔｅｒ，Ａｃａ...     

并行计算模型及其算法设计

并行计算模型及其算法设计李晓梅，窦勇（国防科技大学计算机系）ＰＡＲＡＬＬＥＬＣＯＭＰＵＴＡＴＩＯＮＭＯＤＥＬＳＡＮＤＬＧＯＲＩＴＨＭＤＥＳＩＧＮ￥ＬｉＸｉａｏｍｅｉ；ＤｏｎＹｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅＣｈａｎｇｓｈ...     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

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。