检索结果-内蒙古大学图书馆

A model of context-dependent association using selective desensitization of nonmonotonic neural elements

systems and Computers in Japan 2005年第7期36卷 73-83页

作者： Morita, Masahiko Matsuzawa, Kouhei Morokami, Shigemitsu Institute of Engineering Mechanics and Systems University of Tsukuba Tsukuba 305-8573 Japan Doctoral Program in Systems and Information Engineering University of Tsukuba Tsukuba 305-8573 Japan

In neural networks based on a distributed information representation, when different patterns are to be recalled from the same input by association depending on the context, the usual method is to concatenate the pattern representing the context with the input pattern. However, there is a serious problem in this approach, and strong constraints are imposed on the number of inputs and the number of context patterns. This paper tries to apply a different method of contextual modification to nonmonotonic neural networks in order to construct a context-dependent associative model that can solve the longstanding problem. In the proposed model, the number of associations that can be learned increases almost in proportion to the number of elements, regardless of the numbers of the input and context patterns. In addition, the state transitions among attractors can be controlled flexibly by switching the context, which enables the model to simulate the behavior of any finite automaton without inducing an explosive increase in the number of elements or the training time. The model also has a high generalization power ability based on fully distributed representations and has potential for overcoming the limitations of conventional symbol processing. © 2005 Wiley Periodicals, Inc.

关键词： Neural networks

来源：评论

学校读者我要写书评

暂无评论

Study on the quench behaviour of molten fuel material jetted into coolant

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japa...

引用

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 2005年第703期71卷 947-953页

作者： Abe, Yutaka Kizu, Tetsuya Nariai, Hideki Chitose, Keiko Koyama, Kazuya Doctoral Program in Engineering Mechanics and Energy Graduate School of Systems and Information Engineering 1-1-1 Tennodai Tsukuba-shi Ibaraki 305-8573 Japan

In a core disruptive accident (CDA) of a Fast Breeder Reactor, the post accident heat removal (PAHR) is crucial for the accident mitigation. The molten core material should be solidified in the sodium coolant in the reactor vessel. In the present experiment, molten material is injected into water to experimentally obtain fragments and the visualized information of the fragmentation. The distributed particle behaviour of the molten material jet is observed with high-speed video camera. The distributions of the fragmented droplet diameter from the molten material jet are evaluated by correcting the solidified particles. The experimental results of the mean fragmented droplet diameter are compared with the existing theories. Consequently, the fragmented droplet diameter is close to the value estimated based on the Kelvin-Helmholtz instability. Once the particle diameter of the fragmented molten,material could be known from a hydrodynamic model, it becomes possible to estimate the mass ratio of the molten particle to the total injected mass by combining an appropriate heat transfer model The mass ratio of the molten fragment to total mass of the melted mixed oxide fuel in sodium coolant estimated in the present study is very small. The result means that most of the molten mixed oxide fuel material injected into the sodium coolant can be cooled down under the solidified temperature, if the amount of the coolant is sufficient.

关键词： Breeder reactors

来源：评论

学校读者我要写书评

暂无评论

Grid environment for computational astrophysics driven by GRAPE-6 with HMCS-G and OmniRPC

Grid environment for computational astrophysics driven by GR...

引用

19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Boku, Taisuke Onuma, Kenji Sato, Mitsuhisa Nakajima, Yoshihiro Takahashi, Daisuke Graduate School of Systems and Information Engineering University of Tsukuba Center for Computational Sciences University of Tsukuba Doctoral Program of Systems and Information Engineering University of Tsukuba

ISBN: (纸本)0769523129

In computational astrophysics, the effect of gravity is essential even with very heavy computation of O(N2) for N particles. Several special purpose machines have been implemented as gravity engine to handle this problem extremely fast, however there are few sites in the world to operate such systems. We have developed a grid environment to access such a system based on grid-RFC, named HMCS-G. Using HMCS-G, a multi-physical computational astrophysics simulation can be performed with the combination of a PC-cluster and the gravity engine GRAPE-6. In typical size of problems for galaxy formation, however, the computation power of PC-cluster is much weaker than that of GRAPE-6, and we need multiple sets of PC-clusters to share the power of GRAPE-6 on grid environment. We have developed such a system using OmniRPC, a grid-enabled RPC system. In this system, OmniRPC are used both to distribute jobs for parameter search on multiple PC-clusters and to access GRAPE-6 server from these clusters. We performed an actual problem to search several formations of galaxy on this system, and confirmed such a solution is useful for wide variety of computational astrophysics research.

关键词： Distributed computer systems

来源：评论

学校读者我要写书评

暂无评论

Topic activation analysis for document streams based on document arrival rate and relevance 05

Topic activation analysis for document streams based on docu...

引用

20th Annual ACM Symposium on Applied Computing

作者： Cui, Chunhua Kitagawa, Hiroyuki Master's Program in Science and Engineering University of Tsukuba Graduate School of Systems and Information Engineering Center for Computational Sciences University of Tsukuba

ISBN: (纸本)9781581139648

With the advance of network technology in recent years, the dissemination and exchange of massive documents has become commonplace. Accordingly, the importance of content analysis techniques is increasing. Topic analysis in large-scale document streams such as E-mails and news articles is an important research issue. This paper addresses techniques for "topic activation analysis" for document streams. For example, when news articles with a strong relationship to a given topic arrive frequently in a news stream, we can regard the activation level of the topic as high. In [I], Kleinberg proposed a method for analyzing document streams. Although the main objective of his method was to detect bursts of topics, it can also be used for topic activation analysis. His method, however, has a serious limitation in that it only looks at the arrival rate of documents and ignores the degree of relevance for each document. Another limitation is that his method is "batch-oriented." This paper first proposes a novel topic activation analysis scheme that incorporates both document arrival rate and relevance to address the first problem. It then presents an incremental scheme more appropriate for a document streaming environment. The proposed schemes are validated by experiments using real CNN news articles. Copyright 2005 ACM.

关键词： Computer networks

来源：评论

学校读者我要写书评

暂无评论

Optimal trajectory planning of manipulators subject to motion constraints

Optimal trajectory planning of manipulators subject to motio...

引用

12th International Conference on Advanced Robotics, 2005. ICAR '05

作者： Shen, Yueshi Hüper, Knut Department of Information Engineering Research School of Information Sciences and Engineering Australian National University Canberra ACT 0200 Australia National ICT Australia Limited Systems Engineering and Complex Systems Program Locked Bag 8001 Canberra ACT 2601 Australia

ISBN: (纸本)0780391772

This paper presents a novel approach to plan an optimal joint trajectory for a manipulator robot performing a compliant motion task. In general, a two-step scheme will be deployed to find the optimal robot joint curve. Firstly, we approximate the functional and use Newton's iteration to numerically calculate the joint trajectory's intermediate discretized points, instead of solving a corresponding nonlinear, implicit Euler-Lagrange equation. Secondly, we interpolate these points to get the final joint curve in a way such that the motion constraints will always be sustained throughout the movement. An example of motion planning for a 4-degree-of-freedom robot WAM will be given at the end of this paper. © 2005 IEEE.

关键词： Manipulators

来源：评论

学校读者我要写书评

暂无评论

Development of innovative techniques for testing and mapping private well water quality

Development of innovative techniques for testing and mapping...

引用

2005 IEEE systems and information engineering Design Symposium

作者： Cherry, Jeff Freel, Craig Hover, Brigitte Jones, Alison Sehgal, Akhil Louis, Garrick E. University of Virginia 151 Engineer's Way Charlottesville VA 22904 United States University of Virginia Department of Systems and Information Engineering University of Virginia School of Engineering and Applied Sciences McIntire School of Commerce Environmental Systems Engineering Program

ISBN: (纸本)0974455946

This paper documents the development of portable kit for testing and mapping water quality in the field, Previously, thorough testing and reporting on well water quality required multiple steps, including costly and time-consuming lab work that often made such testing impractical. To address this problem, a water sampling kit was created that consists of a pocket PC, a GPS receiver and probes to test for pollutants. The kit automatically records the geographical coordinates at the water sampling site, as well as the data collected by the probes into one spreadsheet. The data is then linked to a GIS for display in a simple and usable manner. The efficiency of the kit gives it the potential to create a new standard for sampling water, particularly in the case of private wells, which are currently inadequately monitored due to scarce state resources, This paper describes the process of researching, designing, and testing the water sampling system.

关键词： Water wells

来源：评论

学校读者我要写书评

暂无评论

Measurment of local strain field of a laminated rubber bearing under tensile axial loading 1

Measurment of local strain field of a laminated rubber beari...

引用

1st International Conference on Advances in Experimental Stuctural engineering, AESE 2005

作者： Shoji, Gaku Saito, Kei Kameda, Toshihiro Fueki, Takaaki Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki305-8573 Japan Japan Research Institute Ltd. Tokyo102-0074 Japan Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki305-8573 Japan Master’s Program in Science and Engineering Graduate School University of Tsukuba Ibaraki305-8573 Japan

ISBN: (纸本)4901887181

Effect of tensile axial loading on seismic performance (plastic shear deformation) of a laminated rubber bearing (LRB) was clarified. Cyclic loading tests were carried out to evaluate the relation between lateral force and lateral displacement of the LRB under seismic conditions (i.e., axial loading) and under worn conditions (i.e., 300 cycles). A strain measurement scheme based on image analysis was used to obtain the local strain fields of the LRB. Localized strain fields under tensile axial loading occurred more markedly at the corners of the free surface of the LRB than those under compressive axial loading. The seismic performance of the LRB under tensile or compressive axial loading was degraded severely after shear deformation incurred during 300 cycles. After 300 cycles, for the LRB under compressive axial loading, large localized shear strain fields occurred at the rubber layers underneath and on the inner steel plates, whereas, for the LRB under tensile axial loading, such large strain fields occurred at the rubber layers around the upper and lower steel plates. © 2005 EUCENTRE. All rights reserved.

关键词： Rubber

来源：评论

学校读者我要写书评

暂无评论

Location management for PCS networks with consideration of mobility patterns

Location management for PCS networks with consideration of m...

引用

IEEE INFOCOM 2005

作者： Li, Jie Kubota, Atsushi Kameda, Hisao Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan Doctoral Program in Science and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan

ISBN: (纸本)0780389689

This paper addresses the dynamic location management for personal communication service (PCS) networks with consideration of mobility patterns. The popular hexagonal cellular architecture is considered. In this paper, we first introduce a coordinate system for the hexagonal cellular architectures. Then, we develop an all-direction mobility model based on the coordinate system for the hexagonal cellular architecture to cope with the mobility patterns of mobile terminals (MTs). The shape and size of the local area (LA) in the dynamic location management scheme is determined by minimizing the total location management cost with bounding the paging cost The optimization problem is transferred to maximize expected number of cells traversed by the MT in the LA with a given size of the LA. The analytic model of calculating the probabilities of any MT's moving is established. An algorithm is proposed to solve the optimization problem efficiently. © 2005 IEEE.

关键词： Data transfer

来源：评论

学校读者我要写书评

暂无评论

Optimal trajectory planning of manipulators subject to motion constraints

Optimal trajectory planning of manipulators subject to motio...

引用

International Conference on Advanced Robotics (ICAR)

作者： Yueshi Shen K. Huper Department of Information Engineering Research School of Information Sciences and Engineering Australian National University Canberra ACT Australia Systems Engineering And Complex Systems Program NICTA Canberra ACT Australia

This paper presents a novel approach to plan an optimal joint trajectory for a manipulator robot performing a compliant motion task. In general, a two-step scheme are deployed to find the optimal robot joint curve. Firstly, we approximate the functional and use Newton's iteration to numerically calculate the joint trajectory's intermediate discretized points, instead of solving a corresponding nonlinear, implicit Euler-Lagrange equation. Secondly, we interpolate these points to get the final joint curve in a way such that the motion constraints will always be sustained throughout the movement. An example of motion planning for a 4-degree-of-freedom robot WAM are given at the end of this paper

关键词： Trajectory Orbital robotics Robots Path planning Manipulators Kinematics Constraint optimization Performance analysis Australia Council Space exploration

来源：评论

学校读者我要写书评

暂无评论

A joint space formulation for compliant motion control of robot manipulators

A joint space formulation for compliant motion control of ro...

引用

IEEE International Conference on Mechatronics and Automation

This paper presents a joint space formulation for robot manipulator's hybrid motion/force control. The motivations come from 1) extending the previous work to general (either constrained or redundant) robots; and 2) improving the robustness against disturbances originated at the joint level. Contact geometry and closed-loop dynamics are derived in this paper, also a joint space hybrid control scheme is proposed. At the end, we show some simulation results to verify the applicability of our theory on a constrained (4-degree-of-freedom) robot WAM.

关键词： Motion control Orbital robotics Force control Force measurement Control systems Manipulator dynamics Force feedback Kinematics Motion measurement Filtering

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：