检索结果-内蒙古大学图书馆

Image segmentation based on spatially coherent property

Journal of Computational Information Systems 2012年第1期8卷 415-424页

作者： Wang, Jianping Chen, Yuantao Department of Computer and Information Engineering Changsha Aeronautical Vocational and Technical College Changsha 410014 China School of Computer Science and Technology Nanjing University of Science and Technology Nanjing 210094 China School of Computer and Telecommunication Engineering Changsha University of Science and Technology Changsha 410114 China

The spatial structure and the detailed edge information of an image are important for image segmentation. This paper presents a novel approach that effectively and fast partitions image based on fully exploiting the spatially coherent property of image. The image is first segmented by mean shift (MS) algorithm to form over-segmented regions that preserve the desirable edges and spatially coherent parts. The segmented regions are then represented by region adjacent graph (RAG) using the graph structures. Motivated by the idea of k-means algorithm, the iterative loopy belief propagation (LBP) algorithm is applied to perform the minimization of the cost function to integrate the over-segmented parts to get the final segmentation result since the LBP converges fast. The image clustering based on the segmented regions instead of the image pixels reduces the sensitivity of noise and enhances the image segmentation quality. Compared our segmented result with that of FCM and MRF algorithm, our algorithm shows a better performance based the evaluating criteria of entropy especially on the complex scene images. © 2012 Binary Information Press January 2012.

关键词： Image segmentation

来源：评论

学校读者我要写书评

暂无评论

Awareness and comprehension in software/systems engineering practice and education: Trends and research directions

Awareness and comprehension in software/systems engineering ...

引用

26th Brazilian Symposium on Software engineering, SBES 2012

作者： Schots, Marcelo Werner, Cláudia Mendonça, Manoel Systems Engineering and Computing Program COPPE/UFRJ Federal University of Rio de Janeiro Rio de Janeiro Brazil Computer Science Department Federal University of Bahia Rio de Janeiro Brazil

ISBN: (纸本)9780769548685

The creation of tools, techniques and methodologies to support the manipulation of large data sets has been receiving special attention of both scientific and industrial communities, in order to discover new ways of dealing with the underlying information, including learning purposes, identification of patterns, decision making support, amongst others. However, making use of computing resources to enhance awareness and understanding of software information and the software itself is still a challenge in software/systems engineering, since it involves the identification of suitable mechanisms, adequate abstractions, and studies on stimulation of the human perceptive and cognitive abilities. This paper presents some of the challenges in this context, based on current trends of software development lifecycle, program comprehension, and software engineering education. At the end, a special focus is given on ongoing research on using and improving current mechanisms for supporting software reuse practices and software comprehension in general. © 2012 IEEE.

关键词： computer software reusability

来源：评论

学校读者我要写书评

暂无评论

Configurable clutter models for radar simulation

Configurable clutter models for radar simulation

引用

International Waveform Diversity and Design Conference

作者： Joseph A. Jezak Guy Gadola Charles Berdanier Steven P. Levitan Donald M. Chiarulli Computer Engineering Graduate Program University of Pittsburgh Department of Electrical Engineering Wright State University Department of Electrical and Computer Engineering University of Pittsburgh Department of Computer Science University of Pittsburgh

In this paper we describe an extension to the MATLAB Phased Array Toolkit that adds a configurable clutter object to model clutter signals returned along a specified signal path. The clutter model is based on the Simkins Unified Clutter Model[1]. The current implementation supports sea clutter in any of five sea states with configurable polarization, grazing angle, and beam width. We describe the implementation and give examples of modeled clutter returns.

关键词： Clutter Object oriented modeling Mathematical model Reflectivity Radar Computational modeling Arrays

来源：评论

学校读者我要写书评

暂无评论

Heart wall myofibers are arranged in minimal surfaces to optimize organ function (vol 109, pg 9253, 2012)

引用

PROCEEDINGS OF THE NATIONAL ACADEMY OF scienceS OF THE UNITED STATES OF AMERICA 2012年第49期109卷 20166-20166页

作者： Savadjiev, Peter Strijkers, Gustav J. Bakermans, Adrianus J. Piuze, Emmanuel Zucker, Steven W. Siddiqi, Kaleem [a]Psychiatry Neuroimaging Laboratory and Laboratory for Mathematics in Imaging Brigham and Women’s Hospital Harvard Medical School Boston MA 02215 [b]Department of Biomedical Engineering Eindhoven University of Technology 5600 MB Eindhoven The Netherlands [c]School of Computer Science and Centre for Intelligent Machines McGill University Montréal Canada H3A 2A7 and [d]Departments of Computer Science and Biomedical Engineering and Program in Applied Mathematics Yale University New Haven CT 06520-8285

Heart wall myofibers wind as helices around the ventricles, strengthening them in a manner analogous to the reinforcement of concrete cylindrical columns by spiral steel cables [Richart FE, et al. (1929) Univ of Illinois, Eng Exp Stn Bull 190]. A multitude of such fibers, arranged smoothly and regularly, contract and relax as an integrated functional unit as the heart beats. To orchestrate this motion, fiber tangling must be avoided and pumping should be efficient. Current models of myofiber orientation across the heart wall suggest groupings into sheets or bands, but the precise geometry of bundles of myofibers is unknown. Here we show that this arrangement takes the form of a special minimal surface, the generalized helicoid [Blair DE, Vanstone JR (1978) Minimal Submanifolds and Geodesics 13-16], closing the gap between individual myofibers and their collective wall structure. The model holds across species, with a smooth variation in its three curvature parameters within the myocardial wall providing tight fits to diffusion magnetic resonance images from the rat, the dog, and the human. Mathematically it explains how myofibers are bundled in the heart wall while economizing fiber length and optimizing ventricular ejection volume as they contract. The generalized helicoid provides a unique foundation for analyzing the fibrous composite of the heart wall and should therefore find applications in heart tissue engineering and in the study of heart muscle diseases. [PUBLICATION ABSTRACT]

关键词： myocardium myofiber geometry diffusion tensor MRI

来源：评论

学校读者我要写书评

暂无评论

Performance Evaluation of Channel Reservation Schemes for Reservation-based MAC Protocols with Different Priorities

Performance Evaluation of Channel Reservation Schemes for Re...

引用

International Symposium on Communications and Informaiton Technologies

作者： Nitthita Chirdchoo Piya Kovintavewat Pisit Vanichchanunt Norrarat Wattanamongkhol Lunchakorn Wuttisittikulkij Warakorn Srichavengsup Telecommunication Engineering Program Nakhon Pathom Rajabhat University Department of Electrical and Computer Engineering King Mongkut's University of Technology North Bangkok Department of Electrical Engineering Chulalongkorn University Department of Computer Engineering Thai-Nichi Institute of Technology

ISBN: (纸本)9781467311564

This paper considers the problem of channel reservation schemes for reservation-based MAC protocols with different priorities in wireless communication networks. A framework for designing such channel reservation protocols based on p-persistent is introduced. This framework allows us to explore several different prioritization mechanisms which are devised to serve different prioritization policies or requirements. This leads to the development of five channel reservation schemes, namely, FPT+MP, FPT+MLT, FPT+SCS, FPT+PCP and FPT+HFF. The average number of successful reservations for users of different priorities is evaluated as a primary performance measure. Unlike other previous works where different priorities exhibit strict differentiation, our success ratio (γ) is defined to illustrate how much different priorities are differentiated. In doing so, we seek for a channel reservation scheme that can satisfy the required γ, while maximizing the channel utilization. Numerical results show that the combined scheme of FPT+MP and FPT+SCS schemes is the most effective scheme, possessing all desirable key features.

关键词： MAC protocol Performance Evaluation Scheme Wireless networks Performance metrics

来源：评论

学校读者我要写书评

暂无评论

An efficient parallel architecture for ray-tracing

An efficient parallel architecture for ray-tracing

引用

作者： Nery, Alexandre S. Nedjah, Nadia França, Felipe M.G. LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal Do Rio de Janeiro Rio de Janeiro RJ Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade Do Estado Do Rio de Janeiro Rio de Janeiro RJ Brazil

Real time rendering of three-dimensional scenes in high photorealistic details is a hard task, such as in the ray tracing rendering algorithm. In general, the performance achieved by a sequential software-based implementation of ray tracing is far from satisfactory. However, parallel implementations of ray tracing have been enabling reasonable real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an even higher performance. In this paper, we propose a hardware parallel architecture capable of dealing with the main desirable features of ray tracing, such as shadows and reflection effects, imposing low area cost and a promising rendering performance. Such architecture, called GridRT, is based on the Uniform Grid acceleration structure and is intended to deliver massive parallelism through parallel ray-triangle intersection tests as well as parallel processing of many rays. A hardware implementation of the proposed architecture is presented, together with some performance results and resources requirements. The rendering is reduced by 80% using a grid configuration of eight processing elements. © Springer science+Business Media, LLC 2011.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

Vision-based recognition of identity card in mobile platform

Vision-based recognition of identity card in mobile platform

引用

International Conference on Informatics, Electronics & Vision (ICIEV)

作者： Racy Gomes Mohammad Shorif Uddin Sazzad Hossain Department of Electro. and Telecommunication Engineering University of Liberal Arts Bangladesh Dhaka Bangladesh Department of Computer Science and Engineering Jahangir Nagar University Dhaka Bangladesh Department of Computer Science and Engineering University of Liberal Arts Bangladesh Dhaka Bangladesh

The identification of an individual finds diverse applications in many fields such as justice, crime scene, voter identification as well as vehicle driver license identification and so on. Several classic methods have already developed for identifying a person, which are complex, expensive and not flexible in many circumstances. Due to emergence and wide spread availability of portable smart phones it is the demand of time to develop such an application in mobile platform by overcoming the drawbacks of classical methods. This paper solves this problem using available mobile phones in the market.

关键词： Mobile communication Character recognition Servers Irrigation

来源：评论

学校读者我要写书评

暂无评论

A portable Telemedicine system in the context of rural Bangladesh

A portable Telemedicine system in the context of rural Bangl...

引用

International Conference on Informatics, Electronics & Vision (ICIEV)

作者： Poppy Siddiqua M. Abdul Awal Electronics and Telecommunication Engineering Department Daffodil International University Dhaka Bangladesh Electrical Engineering and Computer Science Department North South University Dhaka Bangladesh

ISBN: (纸本)9781467311533

In general, Telemedicine refers to the use of information and communication technology to provide health care facilities and support patients in remote area by providing expert consultation. It is also a way to provide medical procedures to remote locations at the time of emergency. Telemedicine can be considered as a way to improve the quality of health care services. It can be implemented to ensure the access to health care services lowering the costs and saving time as well. Many developing countries are implementing telemedicine to provide health care facility to remote area where health care facilities are poor. As a developing country Bangladesh cannot provide all the health care services to its rural people with its limited resources. Implementing a nationwide telemedicine network will help Bangladesh to support its rural population by providing quality health services. In this paper we mention some important factors which are related to implement Telemedicine system in a developing country like Bangladesh. We also propose a prototype portable telemedicine system for rural Bangladesh that can improve health care facilities of the rural people by making a connection between rural people and specialised hospitals in the capital or in a distant location.

关键词： Telemedicine Irrigation Headphones Electrocardiography

来源：评论

学校读者我要写书评

暂无评论

Supporting collaboration for smarter city planning

Supporting collaboration for smarter city planning

引用

6th International Conference on Ubiquitous Computing and Ambient Intelligence, UCAmI 2012

作者： Frez, Jonathan Baloian, Nelson Zurita, Gustavo School of Informatics and Telecommunication Engineering Universidad Diego Portales Manuel Rodriguez Sur 415 RM Santiago Chile Department of Computer Science Universidad de Chile Santiago Chile Information Systems and Management Dept. Universidad de Chile Santiago Chile

ISBN: (纸本)9783642353765

computer-based collaborative tools have been proven to be effective in supporting inhabitants of cities to participate more activeley in the decisions about the development of their cities and environment. These tools are also help them to organize themselfs and react more quickly to changes in the environment enabling at the same time the broad participation of its population in the decisions about its development. An example of this situation is triggered by a new law recently issued in Chile which aims to give its population an opportunity to participate in the decision about whether a new mobile communication antenna should be placed in their neighborhood and under which circumstances. This works proposes a new example of such a tool which allows citizens to gather and display the relevant information for such circumstances. © 2012 Springer-Verlag.

关键词： Smart city

来源：评论

学校读者我要写书评

暂无评论

Multi-sensor Multi-target Tracking for Infrastructure Protection

Multi-sensor Multi-target Tracking for Infrastructure Protec...

引用

European Intelligence and Security Informatics Conference (EISIC)

作者： M.V. Moreno C. Piñana-Diaz R. Toledo-Moreno M.A. Zamora A. Skarmeta Department of Information and Communications Engineering Computer Science Faculty University of Murcia Murcia Spain Department of Electronics and Computer Technology School of Telecommunication Engineering Technical University of Cartagena Murcia Spain

This paper presents a solution to the problem of intruder detection applied to control the access to safety-critical infrastructures. The system under consideration exploits the measurements of a radar and some Unattended Ground Sensors (UGS) by means of a multi-sensor multi-target tracking algorithm. Several experiments in real environments validate our proposal showing good results.

关键词： Radar tracking Sensor fusion Target tracking Sensor systems

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：