一种基于外形区域的图像配准方法与实现

医学图像配准是医学图像处理与分析的重要组成部分。但由于医学图像的复杂性,在配准精度和配准速度两方面均优的算法很少。提出了一种基于分割所得二值图像的配准算法,并提出了一种适合二值图像配准的相似化测度,最后详细讨论了此算法的实现问题。与现今最流行的基于互信息的配准方法相比,文中的算法更易于实现,且具有良好的特性：适用于单模和多模图像配准;亚像素级精度;快速的配准速度。     

一种基于外形区域的图像配准方法与实现

医学图像配准是医学图像处理与分析的重要组成部分.但由于医学图像的复杂性,在配准精度和配准速度两方面均优的算法很少.提出了一种基于分割所得二值图像的配准算法,并提出了一种适合二值图像配准的相似化测度,最后详细讨论了此算法的实现问题.与现今最流行的基于互信息的配准方法相比,文中的算法更易于实现,且具有良好的特性:适用于单模和多模图像配准;亚像素级精度;快速的配准速度.     

基于自适应算法的BA网络模型及其聚类分析

BA模型是经典的无标度网络模型,具有一定小世界特性,但聚类系数随着点数增多趋近于零。为进一步优化BA网络模型的平均路径长度和聚类系数的特性,设计了一种基于自适应算法的无标度网络改进模型。改进模型优化了系统与网络节点的关联度,通过计算得到关联度的最优值及此时网络各参数的值,从而获得理想的网络模型。通过对自适应算法中关联度的数学分析,可知系统平均路径长度呈带有条件的收敛状态。仿真结果表明,改进后网络模型在平均路径长度和聚类系数方面,有进一步优化。不同于BA无标度网络的是,改进模型优化后具有较明显的聚类特性,更符合小世界网络特性。     

基于粒子滤波和模拟退火方法的图像配准

图像配准技术在很多领域都应用广泛,如在医学图像分析、计算机视觉、遥感图像等。在仿射变换模型下,只需知道仿射变换参数即可对图像进行配准。为了准确快速地配准,论文在贝叶斯框架下,提出了一种基于粒子滤波和模拟退火法相结合的图像配准算法。首先通过观测模型得到参数的后验概率分布,利用粒子滤波逐步迭代并更新权值来逼近参数的真实值,再利用重构的概率分布模型获得准确的仿射变换参数,对图像进行配准。在粒子更新阶段利用模拟退火算法改进寻优过程,提高运算效率,使结果快速收敛。最后通过实验验证,该文方法易于实现,有较高的准确性和鲁棒性。     

彩色Range图像的三维模型重建

重建包含模型真实纹理的彩色三维模型是计算机视觉研究领域的一个重要问题,提出了一种基于2.5维深度图像的三维配准算法,同时利用原始数据中的几何以及纹理信息,对多幅深度图像进行两两配准和全局配准。新算法在两两配准阶段将纹理信息用于初选两幅图像的匹配点对,在全局配准阶段将纹理信息用于计算残差,并据此更新对应点对的权重值用于下一次迭代计算。该算法克服了以往算法在纹理、几何信息的参数尺度量化等方面的问题。     

基于指数函数的灰色动态多属性关联决策模型

针对同一属性下不同方案的邓氏关联度大小区分较弱以及关联度存在下限的问题, 定义基于指数函数的新关联度. 改进后的关联度对同一属性下不同方案间关联度的分辨率要高于原有关联度, 并证明了改进关联度的性质.利用指数关联度确定属性权重, 构造基于偏差和灰熵的确定了时间权重的优化模型. 最后, 将该方法用于河南省某地级市民营企业的经营业绩评价分析中, 实例说明了所提出模型的有效性和实用性.

     

一种权值约束的精确配准算法

针对数据与模型的精确配准问题,提出一种权值约束的配准算法,通过 对配准点施加不同的权值,利用权值约束保证模型重要区域的配准精度。首先,论文基于经 典配准模型,引入权重因子,建立了改进的权值约束的配准模型。针对配准模型的求解问题, 通过对现有SVD-ICP 算法进行适应性改进,提出并研究了带权SVD-ICP(wSVD-ICP)算法, 重点推导了基于wSVD 算法求解旋转矩阵R 和平移矩阵T 的过程。最后,论文利用仿真数 据和实测数据对配准模型进行了验证;计算结果表明,论文所提算法通过对精度要求较高区 域分配高权值进行约束,可有效提升该局部区域的配准精度;同时,可在一定程度上改进整 体配准精度和效率。     

基于内阻法修正的蓄电池卡尔曼滤波SOC估算

针对蓄电池卡尔曼滤波算法荷电状态SOC（State of Charge）初始值的估计误差较大可能导致前期收敛性较差的问题,通过分析蓄电池放电实验数据,运用灰色关联模型计算电池内阻、电压和电流参数关于SOC的关联度值,将关联度最高的内阻参数作为初始SOC估计值的自变量。然后将初始SOC估计值代入由二阶等效电路模型构建的扩展卡尔曼滤波算法中,进行SOC估计。最后利用电测试平台验证SOC估计准确性,并与电压参数作为初始SOC估计值自变量的方法进行对比。实验结果表明,相对于电压法的初始估计值,内阻法的初始估计值更接近真实值,将其作为卡尔曼滤波算法的起始值,更能提高初期荷电状态估算精度。     

基于模型的人脸图像配准*

为了提高活动形状模型算法在图像配准中的鲁棒性,设计了两种基于Fisher变换的局部外观模型,并基于改进的模型提出了一种人脸图像配准算法。新算法结合了改进的模型和传统外观模型,可以较好地抵抗噪声干扰。     

基于模型的人脸图像配准

为了提高活动形状模型算法在图像配准中的鲁棒性,设计了两种基于Fisher变换的局部外观模型,并基于改进的模型提出了一种人脸图像配准算法.新算法结合了改进的模型和传统外观模型,可以较好地抵抗噪声干扰.     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

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.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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