检索结果-内蒙古大学图书馆

IEE Eleventh UK Teletraffic Symposium, 11th. Performance Engineering in Telecommunications Networks

作者： X.G. Cao A.G. Tagg Sch. of Comput. & Math. Sci. Oxford Brookes Univ. UK Distributed System Research Group School of Computing and Mathematical Sciences Oxford Brookes University Oxford UK

The effective use between these applications of the limited bandwidth at the User-Network Interface (UNI) has raised increasing interest from both end-system and telecommunication networks researchers. This paper addresses the structure of higher layer traffic controls at the end-systems. A session scheduling priority scheme is proposed which reflects the user specified service priority and the importance of the minimum quality. A stream level traffic control device ('stream filter') is proposed at the end-system, which may restrain a traffic stream in response to cell level connection status. The interactive mechanism between the session scheduler and the stream filters has been investigated.< >

关键词： Interactive systems Multimedia systems Network interfaces Scheduling User interface management systems

来源：评论

学校读者我要写书评

暂无评论

Techniques for improving comput.r-assisted communication for physically impaired non-vocal people through using prestored extended texts

Techniques for improving computer-assisted communication for...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： N. Alm J.L. Arnott A.F. Newell Microcentre Department of Mathematics and Computer Science Dundee University Dundee UK University of Dundee Dundee Dundee GB Dept. of Math. & Comput. Sci. Dundee Univ. UK

The problems faced by people whose physical impairments include the inability to communicate through speech are demonstrated by the fact that, even with current technology, speech rates achievable using speech output devices typically vary between 2-10 words per minute. We have been investigating ways in which the communication system itself could take on many of the cognitive and manipulative tasks required to locate and produce suitable prestored texts for the user. The storage and retrieval methods we have investigated include a text database with items indexed semantically and pragmatically, logging conversational paths for reuse, hypertext, and fuzzy information retrieval. The ultimate goal of this work is a communication system which will allow a severely impaired nonvocal person to make a significantly better conversational impact than is possible with present systems.< >

关键词： Speech Information retrieval Databases

来源：评论

学校读者我要写书评

暂无评论

Bidirectional convergence: A cognitive approach to generalisation

Bidirectional convergence: A cognitive approach to generalis...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： M.K. Weir J.G. Pohill Department of Mathematics and Computer Science University of Saint Andrews Saint Andrews UK University of Saint Andrews Saint Andrews Fife GB Dept. of Math. & Comput. Sci. St. Andrews Univ. UK

We present a cognitive approach to generalisation, Bidirectional Convergence. This is the implementation of a cognitive process we call concept crystallisation, whereby a concept is formed gradually from initially many possibilities which converge to a single possibility under the weight of a series of learning instances shown over a period of time. Bidirectional Convergence (BDC) is a form of concept crystallisation that represents the alternative possible concepts through. Boundary versions of the concept during learning. BDC is an abstraction of Mitchell's symbolic concept learning technique (1982). We describe how BDC is evolved from Mitchell's technique into a form suitable for incorporation into neural networks, BDC is shown to provide a best-fit to given problems.< >

关键词： Convergence Crystallization Learning systems math.matics comput.r sci.nce Neural networks Encoding

来源：评论

学校读者我要写书评

暂无评论

Multiple access protocols for multimedia ATM traffic

Multiple access protocols for multimedia ATM traffic

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： W.M. Moh Yu-Jen Chien Teng-Sheng Moh J. Wang Yi-Wen Yang Mathematics & Computer Science Department San Jose State University Foundation San Jose CA USA Silicon Valley Research Inc. Mountain View CA USA Dept. of Math. & Comput. Sci. San Jose State Univ. CA USA

Multimedia application integrates a variety of media, namely, audio, video, images, graphics, text and data. The ATM (Asynchronous Transfer Mode) technique has been recommended by the CCITT as the transport vehicle for BISDN (Broadband Integrated Service Digital networks) which is designed to provide multimedia traffic services. In this work we study some of the ATM-compatible multiple access MAN (Metropolitan Area Network) protocols, including DQDB (Distributed Queue Dual Bus, also known as IEEE 802.6), CRMA (Cyclic Reservation Multiple Access), DQMA (Distributed Queue Multiple Access), and FDQ (Fair Distributed Queue), and their performance for different kinds of multimedia application, including interactive education, on-line medical information system, and video conferences. We found that all four protocols achieve maximum throughput even at extremely high data rate, which make them suitable for carrying multimedia traffic in high speed networks.

关键词： Access protocols Asynchronous transfer mode Telecommunication traffic Traffic control Graphics Vehicles B-ISDN Metropolitan area networks Multimedia systems Medical information systems

来源：评论

学校读者我要写书评

暂无评论

Techniques for finding ring covers in survivable networks

Techniques for finding ring covers in survivable networks

引用

1994 IEEE GLOBECOM. Communications: The Global Bridge

作者： L.M. Gardner M. Heydari J. Shah I.H. Sudborough I.G. Tollis C. Xia Comput. Sci. Program Texas Univ. Richardson TX USA Department of Mathematics and Computer Science University of Wisconsin Whitewater Whitewater WI USA Alatel Network Systems Inc. Richardson TX USA Computer Science Program Jonsson School of Engineering and Computer Science University of Texas Dallas Richardson TX USA

Given an arbitrary telecommunications network N our goal is to find the minimum cost for equipment which will enable N to survive an arbitrary link fault. We consider uni-directional and bi-directional ring technologies. Basically, our goal is to find minimum cost ring covers for any network N, where a ring cover is a set C of rings such that every link in N is covered by (i.e. part of) at least one ring in C. If a network N is augmented with enough equipment to support a given ring cover C, it can respond to a link failure immediately (and automatically) by routing the disrupted traffic through surviving links in the ring that covers the failed link. We describe an efficient algorithm to find a minimum cost ring cover for uni-directional transmission rings under simplifying assumptions. This algorithm offers a useful heuristic for comput.ng low cost ring covers for existing networks and actual cost functions. We also provide efficient heuristics to find nearly minimum cost ring covers for bi-directional transmission rings. We show that certain versions of the bi-directional problem are NP-complete, hence (presumably) no efficient algorithm exists that always finds a minimum cost ring cover. However, our heuristics perform well in practice.

关键词： Intelligent networks Bidirectional control comput.r networks Cost function SONET Telecommunication traffic Routing Cities and towns Airports Optical fiber devices

来源：评论

学校读者我要写书评

暂无评论

Differential sensitivity to increases and decreases in tempo: Evidence for an entrainment model

引用

The Journal of the Acoustical Society of America 1994年第5_SUPPLEMENT期96卷 3257-3257页

作者： J. Devin McAuley Gary R. Kidd Dept. of Comput. Sci. Cognitive Sci. Program Indiana Univ. Bloomington IN 47405 Indiana Univ. Bloomington IN 47505

Listeners’ abilities to detect changes in tempo were investigated with two‐ and four‐tone isochronous sequences with interonset intervals (IOI) of 100, 400, 700, and 1000 ms. Separate thresholds were measured for increases and decreases in tempo using an adaptive‐tracking procedure. On each trial a standard pattern was followed by two comparison patterns, one of which was faster or slower than the standard. Listeners judged which comparison pattern was different from the standard. Consistent with previous studies of tempo discrimination, thresholds were found to be lower with four‐tone sequences than with two‐tone sequences, especially at the faster tempos. However, at the fastest tempos, listeners showed greater sensitivity to increases than to decreases in tempo, while the reverse was true at the slower tempos. The crossover point occurred at an IOI between 400 and 700 ms. The findings are consistent with the predictions of an entrainment model [J. D. McAuley, J. Acoust. Soc. Am. 95, 2966 (A) (1994)] in which tempo sensitivity is reflected by the degree to which a system of adaptive osci.lators is entrained by the rhythm of a stimulus pattern. [Work supported by NIMH and NIDCD.]

关键词：

来源：评论

学校读者我要写书评

暂无评论

A METRIC FOR LINE SEGMENTS

引用

IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 1993年第12期15卷 1312-1318页

作者： NACKEN, PFM Center for Math. & Comput. Sci. Amsterdam Netherlands

This correspondence presents a metric for describing line segments. This metric measures how well two line segments can be replaced by a single longer one. This depends for example on collinearity and nearness of the line segments. The metric is constructed using a new technique using so-called neighborhood functions. The behavior of the metric depends on the neighborhood function chosen. In this correspondence, an appropriate choice for the case of line segments is presented. The quality of the metric is verified by using it in a simple clustering algorithm that groups line segments found by an edge detection algorithm in an image. The fact that the clustering algorithm can detect long linear structures in an image shows that the metric is a good measure for the groupability of line segments.

关键词： CLUSTERING FUNCTION SPACES IMAGE ANALYSIS LINEAR STRUCTURE LINE SEGMENTS METRIC TOKEN

来源：评论

学校读者我要写书评

暂无评论

EXTENSION OF MATRIX-METHOD FOR COMPLETE MULTIPOINT PADE-APPROXIMATION (VOL 29, PG 1805, 1993)

引用

ELECTRONICS LETTERS 1993年第24期29卷 2156-2156页

作者： LUCAS, TN Dept. of Math. & Comput. Sci. Dundee Inst. of Technol. UK

A recent multipoint Pade approximation technique for linear system reduction is extended to include expansion points at infinity. The method is then seen to be completely general, covering the cases of real, complex, ... 详细信息

关键词： approximation theory linear system reduction linear systems matrix algebra matrix method model order reduction modelling multipoint Pade approximation

来源：评论

学校读者我要写书评

暂无评论

ON LEARNING TO RECOGNIZE 3-D OBJECTS FROM EXAMPLES

引用

IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 1993年第8期15卷 833-837页

作者： EDELMAN, S Dept. of Appl. Math. & Comput. Sci. Weizmann Inst. of Sci. Rehovot Israel

Previous results on nonlearnability of visual concepts relied on the assumption that such concepts are represented as sets of pixels [1]. This correspondence uses an approach developed by Haussler [2] to show that under an alternative, feature-based representation, recognition is PAC learnable from a feasible number of examples in a distribution-free manner.

关键词： COMPLEXITY LEARNING FROM EXAMPLES OBJECT RECOGNITION REPRESENTATION VISION

来源：评论

学校读者我要写书评

暂无评论

PROJECTIVE COLLINEATIONS IN EINSTEIN-SPACES

引用

CLASSICAL AND QUANTUM GRAVITY 1993年第6期10卷 1139-1145页

作者： BARNES, A Dept. of Comput. Sci. & Appl. Math. Aston Univ. Brimingham UK

Spacetimes admitting a group of (local) projective collineations are considered. In an n-dimensional proper Einstein space it is shown that any vector field xi(i) generating a proper projective collineation (that is one which is not an affine collineation) is the gradient of a scalar field phi (up to the addition of a Killing vector field). Then a four-dimensional Einstein spacetime admitting a proper projective collineation is shown to have constant curvature. For an n-dimensional space of non-zero constant curvature, the scalar field phi satisfies a system of third-order linear differential equations. The complete solution of this system is found in closed form and depends on (n + 1)(n + 2)/2 arbitrary constants. All gradient vector fields xi(i) generating projective collineations are found explicitly and together with the n(n + 1) /2 killing vector fields generate a Lie algebra of dimension n(n + 2).

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：