检索结果-内蒙古大学图书馆

作者： Kishihara, Mitsuyoshi Ikeuchi, Hiroaki Utsumi, Yuichi Kawai, Tadashi Ohta, Isao Faculty of Computer Science and System Engineering Okayama Prefectural University Soja-shi 719-1197 Japan Graduate School of Engineering University of Hyogo Himeji-shi 671-2201 Japan Laboratory of Advanced Science and Technology for Industry University of Hyogo Hyogo-ken 678-1205 Japan

The metallic waveguide is one of many effective media for millimeter- and submillimeter-waves because of the advantage of its lowloss nature. This paper describes the fabrication method of PTFE-filled waveguide components with the use of the SR (synchrotron radiation) direct etching process of PTFE, sputter deposition of metal, and electroplating. PTFE is known as a difficult material to process with high precision. However, it has been reported that PTFE microstructures can be fabricated by the direct exposure to SR. First, an iris-coupled waveguide BPF with 5-stage Chebyshev response is designed and fabricated for the Q-band. It is demonstrated that the present process is applicable for the fabrication of the practical components inclusive of narrow patterns. Then, a cruciform 3 dB coupler with air-filled posts is designed and fabricated for the Q-band. Directivity and matched state of the coupler can be realized by "holes" in the dielectric material. The measurement results are also shown. Copyright © 2012 The Institute of Electronics, Information and Communication Engineers.

关键词： Bandpass filters

来源：评论

学校读者我要写书评

暂无评论

Pedestrian position and pathway in the design of 3D mobile interactive navigation aid 12

Pedestrian position and pathway in the design of 3D mobile i...

引用

10th International Conference on Advances in Mobile Computing and Multimedia, MoMM 2012

作者： Mantoro, Teddy Abubakar, Adamu I. Ayu, Media A. Chiroma, Haruna Informatics Department Advanced Informatics School Universiti Teknologi Malaysia Kuala Lumpur Malaysia Department of Information System KICT International Islamic University Malaysia Kuala Lumpur Malaysia Artificial Intelligence Department Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia

ISBN: (纸本)9781450313070

The aim of navigation aid in general is to provide an optimal route from the current position to the destination. Unfortunately, there are lot of drawbacks from many navigation aids such as giving wrong directions to the destination, and lack of interaction with other users. This paper presents pedestrian positions and pathway determination for the design of 3D mobile interactive navigation aid. The system was developed and aims to help people navigate in an unfamiliar locations and to overcome the weaknesses of conventional 2D maps, which require users to interpret its various symbols and legends and also to present desired locations and routes to a high degree of accuracy. The system allows several mobile device users to view their own and other users' locations at the same time, while being stationary or on-the-move. The role of 3D view is to add to an existing individual cognitive map. Voronoi diagram and its dual Delaunay triangulation are the algorithms used for establishing user positions and the optimum pathway to a target destination. Using this technique contributes to a well-defined positioning and pathway establishment in the design of navigation assisted systems. © 2012 ACM.

关键词： Location

来源：评论

学校读者我要写书评

暂无评论

A data caching approach for sensor applications

A data caching approach for sensor applications

引用

Computing, Communications and Applications Conference (ComComAp)

作者： Mohammed Aalsalem Khaled Almi'ani Bassam Alqaralleh Faculty of Computer and Information System Jazan University Saudi Arabia Faculity of Information Technology Al Hussein Bin Talal University Maan Jordan

In sensor network applications, data gathering mechanisms, which are based on multi-hop forwarding can be expensive in terms of energy. This limitation reduces the lifetime of the network and challenges the use of sensor networks for applications that demand a predefined operational lifetime. To avoid this problem, the benefits of using mobile gateway to prolong sensor life-time have been explored in the literature. However, practical considerations such as the gateway speed and route planning, sensor buffer size and data frequency generation constraints impose limits on the mobile elements. In this work, we consider the natural hybrid solution that combines the two approaches of mobile gateways and multi-hop forwarding to address more constraints for sensor applications. We provide algorithmic solutions that attempt to balance the benefits of both approaches. Based on a given predetermined time deadline, a gateway tour will be established to involve a subset of the sensors. These selected sensors will work as gathering points and will aggregate the other sensors' data. The gathering points/nodes are selected with the aim of reducing the energy expenditures due to multi-hop forwarding. We also present a heuristic-based solution and validate its performance through an extensive set of experiments.

关键词： Logic gates Wireless sensor networks

来源：评论

学校读者我要写书评

暂无评论

A Comparison of CP, IP, and SAT Solvers through a Common Interface

A Comparison of CP, IP, and SAT Solvers through a Common Int...

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Neng-Fa Zhou Masato Tsuru Eitaku Nobuyama Brooklyn College & Graduate Center City University of New York USA Faculty of Computer Science & System Engineering Kyushu Institute of Technology Japan

This paper presents a common interface for Prolog to three different types of discrete solvers including Constraint Programming (CP), Integer Programming (IP), and SAT solvers. The interface comprises primitives for creating decision variables, specifying constraints, and invoking a solver, possibly with an objective function to be optimized. Before a solver is actually called, the accumulated variables and constraints are transformed into a form acceptable to the solver. For a SAT solver, in particular, variables are Booleanized and constraints are compiled into CNF. Implemented in B-Prolog, the interface allows the programmer to use the features of the host language such as recursion, pattern matching, arrays, and loops to describe problems. The interface provides an easy and uniform platform for exploring different solvers and models. This paper compares the performance of the CLP(FD) of B-Prolog, the CPLEX IP solver, and the Lingeling SAT solver on several problems through the same interface and for each problem it compares a model that uses Boolean variables and another model that uses general integer variables. Our experience tells that it is effortless to switch from one solver to another.

关键词： Color IP networks Linear programming Mathematical model Educational institutions Programming Pattern matching

来源：评论

学校读者我要写书评

暂无评论

RASID demo: A robust WLAN device-free passive motion detection system

RASID demo: A robust WLAN device-free passive motion detecti...

引用

IEEE Annual Conference on Pervasive Computing and Communications Workshops (PerCom)

作者： Ahmed E. Kosba Moustafa Youssef Department of Computer and System Engineering Faculty of Engineering Alexandria University Egypt Department of Computer Science and Engineering Egypt-Japan University of Science and Technology (E-JUST) Alexandria University Egypt

WLAN device-free passive (DfP) indoor localization is an emerging technology enabling the localization of entities that neither carry any devices nor participate actively in the localization process using the already installed wireless infrastructure. This technology can be promising for a variety of applications, where special hardware might not be applicable such as intrusion detection and smart homes. We present a demonstration of RASID, a system capable of detecting passive human motion using the already installed wireless networks. RASID uses statistical anomaly detection techniques to detect motion inside indoor environments. The system also is capable of adapting to the environment changes for enhancing its accuracy.

关键词： Monitoring Motion detection Humans Wireless LAN Robustness Electronic mail Conferences

来源：评论

学校读者我要写书评

暂无评论

Efficient digital image authentication and tamper localization technique using 3Lsb watermarking

引用

International Journal of computer Science Issues 2012年第1 1-2期9卷 1-8页

作者： Dadkhah, Sajjad Manaf, Azizah Abd Sadeghi, Somayeh Faculty of Computer Science and Information System University Technology Malaysia 54100 Kuala Lumpur Malaysia Advanced Informatics School University Technology Malaysia 54100 Kuala Lumpur Malaysia

The authentications of digital images have become the center of attentions for certain group of companies since the number of doctored images increased. Tampering the digital images in a way that it's impossible to be detected by naked eyes has become easier with development of image editing tools. Digital watermarking can preserve the authentication of digital images. In this paper we proposed an efficient image tamper detection method using 3 LSB (last significant bit) watermarking technique which is able to authenticate the digital image and detect the tamper locations accurately. In the proposed algorithm a 12-bit watermark key will be created from each block of host image which will be embed to last three significant bit of each block. Our proposed method improved tamper detection technique proposed by Prasad's in sense of tamper detection rate by 40 percent. The experimental result clearly proved the efficiency of our proposed method. © 2012 International Journal of computer Science Issues.

关键词： Authentication

来源：评论

学校读者我要写书评

暂无评论

Greedy routing life time consideration on Location base routing in wireless sensor Networks

Greedy routing life time consideration on Location base rout...

引用

2012 International Conference on Information and computer Networks (ICICN 2012)

作者： Hadi Asharioun Hassan Asadollahi Sureswaran Ramadass Azlan Bin Osman National Advanced IPv6 Centre (Nav6) University Science Malaysia Department of Computer System and Communication Faculty of Computer Science and Information University Technology Malaysia

Life time issue is a one of the most interested open issues in wireless sensor networks. Increasing life time is very important in WSNs and because of energy limitation the sensors will die and the networks cannot sense. value of different network topology lifetime are important for researchers to comparison their results.. In this paper we calculate the life time of the network base on greedy routing in localized routing.

关键词： Greedy Routing life time sensor networks

来源：评论

学校读者我要写书评

暂无评论

An Improved Image Denoising and Segmentation Approach for Detecting Tumor from 2-D MRI Brain Images

An Improved Image Denoising and Segmentation Approach for De...

引用

International Conference on Advanced computer Science Applications and Technologies (ACSAT)

作者： Ahmed Faisal Sharmin Parveen Shahriar Badsha Hasan Sarwar Department of Computer System & Technology Faculty of Computer Science & Information Technology University of Malaya Kuala Lumpur Malaysia Department of Electrical Engineering University of Malaya Kuala Lumpur Malaysia Department of Computer Science and Engineering United International University Dhaka Bangladesh

Image denoising and segmentation are the two most challenging fields in medical image processing particularly when it is application specific. The presence of noise not only degrades the visual quality but also immensely affects the accuracies of segmentation which is essential for medical diagnosis process. In this paper, we present an improved approach for denoising and segmentation of 2-D magnetic resonance brain images for detecting the tumor. We use fourth order partial differential equation based technique for removing MRI noises and thereby applied segmentation using automatic seeded region growing algorithm for detecting brain tumor automatically. The contribution of this work is the use of compass operator to preserve the anatomically significant information at the edges and a new morphological technique for skull removal from the brain MRI image which leads to the process of detecting tumor accurately. The method is tested on several real brain MRI images and it shows 100% success in detecting tumor automatically.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Equality constrained long-short portfolio replication by using probabilistic model-building GA

Equality constrained long-short portfolio replication by usi...

引用

Congress on Evolutionary Computation

作者： Yukiko Orito Hisashi Yamamoto Yasuhiro Tsujimura Faculty of Economics Hiroshima University Hiroshima Japan Faculty of System Design Tokyo Metropolitan University Tokyo Japan Department of Computer and Information Engineering Nippon Institute of Technology Saitama Japan

Portfolio replication problem is to optimize the portfolio such that its proportion-weighted combination is the same as the given benchmark portfolio. However, the benchmark portfolio generally opens only the return to the public but other information such as the assets included in the portfolio, the proportion-weighted combination, the rebalancing date and the investment strategies is closed to the public. In order to optimize such portfolios, we propose an optimization method based on the probabilistic model-building GA in this paper. On the other hand, we are focusing on the long-short portfolio optimization. The long-short portfolio consists of the assets with long positions in which they have bought and been held and with short positions in which they have been borrowed and sold. While applying any optimization method to the long-short portfolios, the portfolio as a feasible solution must be satisfied an equality constraint. In order to make the feasible solutions effectively, we propose two techniques and then apply them to our optimization method. In the numerical experiments, we show that our method has better ability to replicate the long-short portfolios with good fitness values. We found that, however, some portfolios were not replicated though our method worked well. We also discuss this problem in this paper.

关键词： Portfolios Optimization Benchmark testing

来源：评论

学校读者我要写书评

暂无评论

Personalizing student's profiles using JESS in A Learning Management system(LMS)

Personalizing student's profiles using JESS in A Learning Ma...

引用

International Conference on Interactive Mobile and computer Aided Learning (IMCL)

作者： Ahmad Qasim AlHamad Mohammed Ali Akour Farouq Al-Omari Computer Information System Department Zarqa University Zarqa Jordan Computer Engineering Department Yarmouk University Irbid Jordan Faculty of Information Technology Al al Bayt University Mafraq UK

The goal of personalization is to deliver content relevant to an individual user or a group of users based on what is known about them from their preferences and needs. The idea of personalization is applied and used widely and successfully in the world of e-commerce. The aim of this paper is to personalize student's profiles in an e-learning environment (LMS) using Java Expert system Shell known as JESS.

关键词： Electronic learning Recommender systems Educational institutions Expert systems Materials computer aided instruction Least squares approximation

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：