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Fully Automatic Skull-Stripping in 3D Time-of-Flight MRA Image Sequences

Fully Automatic Skull-Stripping in 3D Time-of-Flight MRA Ima...

引用

1st Eurographics Workshop on Visual Computing and Biomedicine, EG VCBM 2008

作者： Forkert, N.D. Säring, D. Fiehler, J. Illies, T. Färber, M. Möller, D. Handels, H. Department of Medical Informatics University Medical Center Hamburg-Eppendorf Germany Department of Diagnostic and Interventional Neuroradiology University Medical Center Hamburg-Eppendorf Germany Department Computer Engineering Faculty of Mathematics Informatics and Natural Sciences University of Hamburg Germany

ISBN: (纸本)9783905674132

In this paper we present a robust skull-stripping method for the isolation of cerebral tissue in 3D Time-of-Flight (TOF) magnetic resonance angiographic images of the brain. 3D TOF images are often acquired in case of cerebral vascular diseases, because of their good blood-to-background-contrast. Skull-stripping is an essential preprocessing step towards a better segmentation as well as direct visualization of the vascular system. Our approach consists of three main steps. After preprocessing in order to reduce signal inhomogeneities and noise the first main step is the segmentation of the surrounding skull using a region growing approach. The second step is the automatic extraction of distinctive points at the border of the brain, based on the segmentation of the skull, which are then used as supporting points for a graph based contour extraction. The third step is a slicewise correction based on a non-linear registration in order to improve sub-optimal segmentation results. The method proposed was validated using 18 manually stripped datasets. The calculated similarity measures show that the proposed method leads to good segmentation results with only a few segmentation errors. At the same time the mean rate of vessel voxels included by the brain segmentation is 99.18%. In summary the procedure suggested allows a fast and fully automatic segmentation of the brain and is especially helpful as a preprocessing step towards an automatic segmentation of the vessel system or direct volume rendering. © The Eurographics Association 2008.

关键词： Brain

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The synthesis level in bloom's taxonomy a nightmare for an LMS

The synthesis level in bloom's taxonomy a nightmare for an L...

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19th EAEEIE (European Association for Education in Electrical and Information engineering) Annual Conference

作者： Wuttke, Heinz-Dietrich Ubar, Raimund Henke, Karsten Jutman, Artur Faculty Informatics and Automation Ilmenau University of Technology PF 10 05 65 98684 Ilmenau Germany Department of Computer Engineering Tallinn University of Technology Raja 15 12618 Estonia

ISBN: (纸本)9781424420094

A lot of Learning Management Systems (LMS) were developed in the last ten years since E-Learning opens new possibilities in learning scenarios. They offer the possibility to watch any of the students action on the computer, but possibilities to verify the level of knowledge, a student has reached (accordingly to Bloom's Taxonomy), are very poor. Multiple choice questions and the like can only verify lower levels in this taxonomy. In this paper we will discuss a new approach in verifying higher levels of knowledge in connection with interactive teaching software and online laboratories, which are coupled to an LMS. This work is a result of eight years cooperation between the Tallinn University of Technology and the llmenau University of Technology. © 2008 IEEE.

关键词： Taxonomies

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The design of a generic framework for integrating ECA components

The design of a generic framework for integrating ECA compon...

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7th International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS 2008

作者： Huang, Hung-Hsuan Nishida, Toyoaki Cerekovic, Aleksandra Pandzic, Igor S. Nakano, Yukiko Graduate School of Informatics Kyoto University Japan Faculty of Electrical Engineering and Computing University of Zagreb Croatia Department of Computer Information and Communication Sciences Tokyo University of Agriculture and Technology Japan

ISBN: (纸本)9781605604701

Embodied Conversational Agents (EGAs) are life-like computer generated characters that interact with human users in face-to-face multi-modal conversations. ECA systems are generally complex and difficult for individual research groups to develop. Therefore, if there was a common framework for connecting ECA functioning blocks seamlessly to an integrated system, redundant effort can be saved. This paper discusses the issues emerged in developing such a framework and introduces the design and preliminary results of our ongoing project, Generic ECA Framework. Copyright © 2008, International Foundation for Autonomous Agents and Multiagent Systems (***). All rights reserved.

关键词： Multi agent systems

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Teaching digital test with BIST analyzer

Teaching digital test with BIST analyzer

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19th EAEEIE (European Association for Education in Electrical and Information engineering) Annual Conference

作者： Jutman, A. Tsertov, A. Tsepurov, A. Aleksejev, I. Ubar, R. Wuttke, H.-D. Department of Computer Engineering Tallinn University of Technology Raja 15 12618 Tallinn Estonia Faculty of Informatics and Automation Ilmenau University of Technology PO box 100565 D-98684 Ilmenau Germany

ISBN: (纸本)9781424420094

This paper describes a new software tool for high quality training/learning in the field of digital microelectronics. Its main purpose is to give insight into reliability and quality assurance technologies based on Linear Feedback Shift Registers (LFSR) and other Pseudo-Random Pattern Generators (PRPG). Various PRPG types are becoming the mainstream test generation solution used in Built-in Self-Test (BIST) structures. Taking into account complex theoretical concepts behind the microelectronics self-testing (including data coding and compression, cryptography, field theory, linear programming) it is important to effectively educate engineers in this field. The software tool we present in this paper is aimed at facilitating this goal. Unlike other similar systems, this tool facilitates study of various test optimization problems, allows fault coverage analysis for different circuits and with different LFSR parameters. The main didactic aim of the tool is presenting complicated concepts in a comprehensive graphical and analytical way. The multi-platform JAVA runtime environment allows for easy usage of the tool both in the classroom and at home. The BIST Analyzer represents an integrated simulation, training, and research environment that supports both analytic and synthetic way of learning. Due to the above mentioned facts the tool provides a unique training platform to use in courses on electronic testing and design for testability. © 2008 IEEE.

关键词： Microelectronics

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Raising the effectivity of e-learning systems with use of intelligent principles

Raising the effectivity of e-learning systems with use of in...

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ICCC 2008 - IEEE 6th International Conference on Computational Cybernetics

作者： Sivý, Igor Bučko, Marián Madarász, Ladislav Department of Computer and Informatics Technical University of Košice Letná 9 042 00 Košice Slovakia Department of Cybernetics and Artificial Intelligence Faculty of Electrical Engineering and Informatics Technical University of Košice Letná 9 042 00 Košice Slovakia

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Evaluating a Mobile Emergency Response System

Evaluating a Mobile Emergency Response System

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14th International Workshop of Groupware

作者： Sapateiro, Claudio Antunes, Pedro Zurita, Gustavo Vogt, Rodrigo Baloian, Nelson Systems and Informatics Department Superior School of Technology Polytechnic Institute of Setúbal Portugal Department of Informatics Faculty of Sciences University of Lisbon Portugal Management Control and Information Systems Department Business School Universidad de Chile Chile Computer Science Department Engineering School Universidad de Chile Chile

ISBN: (纸本)9783540928300

Existing information systems often lack support to crisis and emergency situations. In such scenarios, the involved actors often engage in ad hoc collaborations necessary to understand and respond to the emerging events. We propose a collaboration model and a prototype aiming to improve the consistency and effectiveness of emergent work activities. Our approach defends the requirement to construct shared situation awareness (SA). To support SA, we developed a collaborative artifact named situation matrixes (SM), which relates different situation dimensions (SD) of the crisis/emergency scenario. A method was also developed to construct and evaluate concrete SM and SD. This method was applied in two organizations' IT service desk teams, which often have to deal with emergency situations. The target organizations found our approach very relevant in organizing their response to emergencies.

关键词： Emergency services

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***: Resource sharing system for explicit fashion-related image annotation

***: Resource sharing system for explicit fashion-related im...

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2008 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology - Workshops, WI-IAT Workshops 2008

作者： Toyama, Toshiaki Konishi, Katsumi Depertment of Computer Science and Communication Engineering Kogakuin University 1-24-2 Nishi-shinjuku Shinjuku-ku Tokyo Japan Depertment of Computer Science Faculty of Informatics Kogakuin University 1-24-2 Nishi-shinjuku Shinjuku-ku Tokyo Japan

ISBN: (纸本)9780769534961

In this paper, we present the web-based resource sharing system KnownStyleNoLife, which allows users explicitly annotate fashion-related images. KnownStyleNoLife harnesses human power and collects image metadata such as object locations, object labels, image rating and semantic relationships among images. Metadata of that type are invaluable as it is difficult for ordinary computer software to extract equivalent metadata from the Web. Acquiring image metadata such as the type and location of objects in images requires a computer to use machine learning techniques, needing training with sample images and Web search techniques, with the outcome that only limited image metadata are extracted. Furthermore, the semantic image relationship metadata is based upon people's image perception, hence user feedback is required to acquire it. Known-StyleNoLife provides a social value to users in return for their explicit annotations. It is a novel approach to harness human power to acquire relevant image metadata. © 2008 IEEE.

关键词： Metadata

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The Fourier Spectrum Analysis of Optical Feedback Self-Mixing Signal under Weak and Moderate Feedback

The Fourier Spectrum Analysis of Optical Feedback Self-Mixin...

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IEEE International Workshop on Electronic Design, Test and Applications (DELTA)

作者： Xiaojun Zhang Jiangtao Xi Yanguang Yu Joe Chichero School of Electrical Computer & Telecommunications Engineering Faculty of Informatics University of Wollongong Wollongong Australia

The spectrum characteristics of self-mixing signals observed in optical feedback self-mixing interferometry (OFSMI) is studied in this paper. The purpose is to provide guidance for the design of pre-processing techniques for eliminating noise or disturbance. The influence of two important parameters of the OFSMI system on the spectrum, that is, the optical feedback factor and the linewidth enhancement factor, are measured by means of Discrete Fourier transform (DFT). The simulated results show that, at a weak feedback, the OFSMI signals are strictly band limited in nature, with the cut-off frequencies being the vibration frequency and the fringe frequency respectively. Also increasing broadens the bandwidth but has little influence on the bandwidth of the signal. At moderate feedback, the OFSMI signals are still band limited with much higher cut-off frequencies, and there is a considerable spectrum spread over a very wide range in the high frequency end. The presented analysis provides sufficient information for applying signal processing to OFSMI signals such as the filter design.

关键词： Optical feedback Signal analysis Cutoff frequency Discrete Fourier transforms Bandwidth Signal processing Optical interferometry Optical noise Information analysis Information filtering

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Implementation of fast digital watermarking techniques

Implementation of fast digital watermarking techniques

引用

International Conference on computer engineering and Systems

作者： Mohamed A. Mohamed Mohy El-Din A. Abou-Soud Mai S. Diab Communications Engineering Department Faculty of Engineering Mansoura University Egypt Computer Systems Department Faculty of Computers and Informatics Benha University Egypt

In this paper, we investigate the problem of choosing the best domain for embedding watermarks in digital still images. During this paper, eight watermarking techniques were implemented and evaluated. Four techniques were selected to represent different approaches of embedding data in spatial domain, three approaches using discrete cosine transform (DCT) domain, and one approach using discrete wavelet transform domain (DWT) domain. The algorithms were chosen to represent a range of computational complexities and implementation structures. The performance of the selected algorithms was evaluated with respect to many perceptibility parameters.

关键词： Watermarking Image coding Cryptography Robustness Discrete wavelet transforms Wavelet domain Computational complexity PSNR Discrete cosine transforms Multiaccess communication

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An Automatic Elaborate Requirement Specification By Using Hierarchical Text Classification

An Automatic Elaborate Requirement Specification By Using Hi...

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International Conference on computer Science and Software engineering

作者： Jantima Polpinij Aditya Ghose Department of Computer Science Faculty of Informatics Mahasarakham University Kantarawichai Mahasarakham Thailand Decision Systems Lab School of Computer Science and Software Engineering Faculty of Informatics University of Wollongong Wollongong Australia

ISBN: (纸本)9781424439027

Ambiguity is a major problem of software errors because much of the requirements specification is written in a natural language format. Therefore, it is hard to identify consistencies because this format is too ambiguous for specification purposes. This paper aims to propose a method for handling requirement specification documents which have a similar content to each other through a hierarchical text classification. The method consists of two main processes of classification: heavy classification and light classification. The heavy classification is to classify the requirement specification documents having similar content together. Meanwhile, light classification is to elaborate specification requirement documents by using the Euclidean distance. Finally, slimming down the number of requirements specification through hierarchical text classification classifying may yield a specification which is easier to understand. That means the proposed method is more effective for reducing and handling in the requirements specification.

关键词： Text categorization computer science Software engineering Euclidean distance Quality assessment informatics computer errors Natural languages Document handling Australia

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