检索结果-南通市图书馆

An efficient semi-blind source extraction algorithm and its applications to biomedical signal extraction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science in china(Series F) 2009年第10期52卷 1863-1874页

作者： yE yaLan sheu Phillip c-y ZENG JiaZhi WANG Gang LUKe School of computer Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China Department of Electrical Engineering and computer Science University of California Irvine CA 92697-2625 USA School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China

In many applications, such as biomedical engineering, it is often required to extract a desired signal instead of all source signals. This can be achieved by blind source extraction （BSE） or semi-blind source extraction, which is a powerful technique emerging from the neural network field. In this paper, we propose an efficient semi-blind source extraction algorithm to extract a desired source signal as its first output signal by using a priori information about its kurtosis range. The algorithm is robust to outliers and spiky noise because of adopting a classical robust contrast function. And it is also robust to the estimation errors of the kurtosis range of the desired signal providing the estimation errors are not large. The algorithm has good extraction performance, even in some poor situations when the kurtosis values of some source signals are very close to each other. Its convergence stability and robustness are theoretically analyzed. Simulations and experiments on artificial generated data and real-world data have confirmed these results.

关键词： blind source extraction blind source separation independent component analysis electrocardiogram fetal EcG Atrial Fibrillation

Data Hiding in DNA for Authentication of Plant Variety Rights

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2013年第1期11卷 38-43页

作者： Wei-Liang Tai charles c.N.Wang Phillip c.y.sheu Jeffrey J.P.Tsai the Department of Information communications Chinese Culture University the Department of Biomedical Informatics Asia University

Hiding data in acid （DNA） can facilitate annotation of important plant the deoxyribose nucleic the authentication and variety rights. A grant of plant variety rights for a new plant variety gives you the exclusive right to produce for sale and sell propagating material of the variety. Digital watermarking techniques have been proposed for a wide range of applications, including ownership protection, copy control, annotation, and authentication. However, existing data hiding methods for DNA change the functionalities of DNA sequences, which induce morphological changes in biological patterns. This paper proposes a high capacity data hiding scheme for DNA without changing the functionalities of DNA sequences. This scheme adaptively varies the embedding process according to the amount of hidden data. Experimental results show that the proposed scheme gives a significantly improved hiding performance than previous schemes. And the robustness and security issues are also analyzed.

关键词： Authentication data hiding deoxyribose nucleic acid watermarking.

在线全文

学校读者我要写书评

暂无评论

热力学遗传算法计算效率的改进

软件学报 2008年第7期19卷 1613-1622页

作者：应伟勤李元香 sheu Phillip c-y 武汉大学软件工程国家重点实验室湖北武汉430072 Department of Electrical Engineering and computer Science University of CaliforniaIrvineCA 92697USA

热力学遗传算法(thermodynamical genetic algorithms,简称TDGA)借鉴固体退火过程中能量与熵的竞争模式来协调GA中"选择压力"和"种群多样性"之间的冲突.然而TDGA目前极高的计算代价限制了其应用.为了提高TDGA的计算效率,首先定义一种等... 详细信息

热力学遗传算法(thermodynamical genetic algorithms,简称TDGA)借鉴固体退火过程中能量与熵的竞争模式来协调GA中"选择压力"和"种群多样性"之间的冲突.然而TDGA目前极高的计算代价限制了其应用.为了提高TDGA的计算效率,首先定义一种等级熵(rating-based entropy,简称RE)度量方法,它能以较小的计算成本度量种群中个体适应值的分散程度.然后引入分量热力学替换规则(component thermodynamical replacement,简称cTR),有效地降低了替换规则的复杂度.同时也证明了cTR规则具有驱动种群自由能近似最速下降的能力.在0-1背包问题上的实验结果表明,RE方法和cTR规则在保持TDGA良好的性能与稳定性的同时,极大地提高了其计算效率.

关键词：遗传算法热力学计算效率多样性度量潜换规则

在线全文

学校读者我要写书评

暂无评论

一种互联网海量情报规则优化方法

小型微型计算机系统 2011年第11期32卷 2204-2209页

作者：张桂刚张勇尤川川李超邢春晓 philip c.y.sheu 清华大学信息技术研究院北京100084 清华大学信息科学与技术国家实验室北京100084 武汉大学软件工程国家重点实验室武汉430072 美国加州大学尔湾分校电子与信息工程系美国加州92697

现在很多部门都需要通过规则处理海量情报数据,规则的数量一旦达到海量级规模,对规则的处理技术的要求将会变得越来越高,海量规则的优化将是一个十分重要的问题.文中展示了一种海量规则的优化方法.若两个规则网最后的计算结果是一样的,... 详细信息

现在很多部门都需要通过规则处理海量情报数据,规则的数量一旦达到海量级规模,对规则的处理技术的要求将会变得越来越高,海量规则的优化将是一个十分重要的问题.文中展示了一种海量规则的优化方法.若两个规则网最后的计算结果是一样的,则可以认为这两个规则网是等价的.基于该等价规则模块的变换可以将代价小的规则模块替换掉代价大的规则模块,从而以后可以选择一种代价最小的规则模块.本文提出规则网模块等价替换的5种优化方法,并对其做了相应的证明.通过优化,可以使得海量规则网处于计算代价尽量最小状态,以此减少处理机的计算工作量.分析表明,通过等价规则替换,可以大大提高规则处理效率.

关键词：规则海量情报规则等价替换规则优化

基于RDF4S的一种轻量语义Web服务组合

在线全文

学校读者我要写书评

暂无评论

计算机科学 2009年第6期36卷 114-118页

作者：黄蓓蓓 philip c.y.sheu 应时张韬崔华张桂刚武汉大学软件工程国家重点实验室武汉430072 加州大学尔湾分校电子工程与计算机科学系美国加州92697

首先简要介绍语义Web服务资源描述框架(RDF4S),在此基础上提出语义Web服务包装机制,语义Web服务经包装后,分别通过组合接口和调用接口为组合语义Web服务的设计与调用提供支持。然后分别详细介绍组合语义Web服务的设计存储和调用执行:通... 详细信息

首先简要介绍语义Web服务资源描述框架(RDF4S),在此基础上提出语义Web服务包装机制,语义Web服务经包装后,分别通过组合接口和调用接口为组合语义Web服务的设计与调用提供支持。然后分别详细介绍组合语义Web服务的设计存储和调用执行:通过图形化的设计工具按照语义Web服务的3种基本逻辑关系设计组合结构图,然后将该图映射到组合结构信息表存储,组合语义Web服务执行时根据结构信息表生成语义Web服务代理对象和相应的语义消息,再根据语义消息传递机制调用Web服务实体。最后用一个实例展示组合语义Web服务执行时的消息传递,试验表明该方法有效。

关键词：服务资源描述框架语义Web服务包装组合结构信息表语义消息语义消息传递机制

在线全文

学校读者我要写书评

暂无评论

演化多目标优化中的几何热力学选择

计算机学报 2010年第4期33卷 755-767页

作者：应伟勤李元香 sheu Phillip c-y 吴昱余法红武汉大学软件工程国家重点实验室武汉430072 加州大学尔湾分校电气工程和计算机科学系美国加利福利亚92697

热力学遗传算法(Thermodynamical Genetic Algorithms,TDGAs)借鉴热力学中的自由能极小过程来统一处理多目标优化在逼近性和多样性两方面的任务.为提高TDGA的运行效率和解集分布均匀性,提出了一种几何热力学选择.在该选择中首先定义角... 详细信息

热力学遗传算法(Thermodynamical Genetic Algorithms,TDGAs)借鉴热力学中的自由能极小过程来统一处理多目标优化在逼近性和多样性两方面的任务.为提高TDGA的运行效率和解集分布均匀性,提出了一种几何热力学选择.在该选择中首先定义角度熵通过扇形采样来度量种群逼近方向的多样性.然后利用距离精英定义距离能量来度量种群的逼近程度,避免了耗时的非劣分层操作.此外,引入分量热力学替换规则以较低计算代价驱动种群的几何自由能快速下降.在多目标0/1背包问题上的实验结果表明,几何热力学选择极大地提高了TDGA的运行效率和解集分布均匀性;采用该选择的TDGA算法可生成与NSGA-II在逼近性和分布多样性上性能相当的解,但在运行效率上明显优于NSGA-II.

关键词：多目标优化演化算法热力学替换角度熵距离能量

A Survey of Human-centered Intelligent Robots:Issues and challenges

在线全文

学校读者我要写书评

暂无评论

IEEE/cAA Journal of Automatica Sinica 2017年第4期4卷 602-609页

作者： Wei He Zhijun Li c.L.philip chen IEEE School of Automation and Electrical Engineering University of Science and Technology Beijing college of Automation Science and Engineering South China University of Technology Department of computer and Information Science Faculty of Science and Technology University of Macao

Intelligent techniques foster the dissemination of new discoveries and novel technologies that advance the ability of robots to assist and support humans. The human-centered intelligent robot has become an important research field that spans all of the robot capabilities including navigation, intelligent control, pattern recognition and human-robot interaction. This paper focuses on the recent achievements and presents a survey of existing works on human-centered robots. Furthermore, we provide a comprehensive survey of the recent development of the human-centered intelligent robot and discuss the issues and challenges in the field.

关键词： Human-centered robots human-robot interaction intelligent control navigation path planning pattern recognition

Formation control with obstacle avoidance of second-order multi-agent systems under directed communication topology

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2019年第9期62卷 144-157页

作者： Guoxing WEN c.L.philip cHEN Hui DOU Hongli yANG chunfang LIU college of Science Binzhou University Department of computer and Information Science Faculty of Science and Technology University of Macau college of Navigation Dalian Maritime University State Key Laboratory of Management and control for complex Systems Institute of AutomationChinese Academy of Sciences Mathematics and Systems Science college Shandong University of Science and Technology

This paper addresses the obstacle avoidance problem of formation control for the multi-agent systems modeled by double integrator dynamics under a directed interconnection topology. The control task is finished by a leader-follower formation scheme combined with an artificial potential field(APF) *** leader-follower scheme is carried out by taking the desired trajectory with the desired velocity as virtual leader, while the APF method is carried out by dealing with the obstacles as the high potential points. When the obstacle avoidance tasks are finished, the artificial potential forces degrade the formation performance, so their undesired effects are treated as disturbances, which is analyzed by the robust H∞performance. Based on Lyapunov stability theory, it is proved that the proposed formation approach can realize the control objective. The result is also extended to the switching multi-agent formation. The effectiveness of the proposed formation scheme is further confirmed by simulation studies.

关键词： formation control obstacle avoidance artificial potential field method H_∞ performance second-order multi-agent system directed topology

Intersecting pathways in inflammation and cancer: Hepatocellular carcinoma as a paradigm

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of clinical Oncology 2012年第2期3卷 15-23页

作者： philip y Wai Paul c Kuo Department of Surgery Loyola University Chicago Stritch School of Medicine Maywood IL 60153 United States

Viral infection and chemical carcinogens trigger somatic changes resulting in activation of oncogenes during tumor initiation in the development of cancer. However, a critical interaction resides in the synergism between these somatic changes and an inflamed tumor microenvironment where myeloid and hematopoietic cells are subverted to enhance tumor progression. The causative molecular mechanisms leading to the development of hepatocellular cancer remain incompletely understood but appear to result from multiple factors related to direct hepatocyte injury and the ensuing inflammatory changes mediated by the host response to tissue injury, DNA damage, repair of cellular damage, and chronic, repetitive injury. In this review, the molecular and cellular changes that regulate inflammation and tissue repair will be compared to the activated local tumor microenvironment. cell-cell signaling within this microenvironment that enhances tumor progression and inhibits anti-tumor immunity will be

关键词： Hepatocellular cancer Inflammation Tumor microenvironment