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Feature Emphasis and Contextual Cutaways for Multimodal Medical Visualization

Feature Emphasis and Contextual Cutaways for Multimodal Medi...

引用

9th Joint Eurographics/IEEE VGTC Symposium on Visualization, EuroVis 2007

作者： Burns, Michael Haidacher, Martin Wein, Wolfgang Viola, Ivan Gröller, M. Eduard Imaging and Visualization Department Siemens Corporate Research PrincetonNJ United States Computer Science Department Princeton University United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Informatics University of Bergen Norway

ISBN: (纸本)9783905673456

Dense clinical data like 3D Computed Tomography (CT) scans can be visualized together with real-time imaging for a number of medical intervention applications. However, it is difficult to provide a fused visualization that allows sufficient spatial perception of the anatomy of interest, as derived from the rich pre-operative scan, while not occluding the real-time image displayed embedded within the volume. We propose an importance-driven approach that presents the embedded data such that it is clearly visible along with its spatial relation to the surrounding volumetric material. To support this, we present and integrate novel techniques for importance specification, feature emphasis, and contextual cutaway generation. We show results in a clinical context where a pre-operative CT scan is visualized alongside a tracked ultrasound image, such that the important vasculature is depicted between the viewpoint and the ultrasound image, while a more opaque representation of the anatomy is exposed in the surrounding area. © The Eurographics Association 2007.

关键词： Visualization

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X3D Multi-user Virtual Environment Platform for Collaborative Spatial Design

X3D Multi-user Virtual Environment Platform for Collaborativ...

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International Conference on Distributed Computing Systems Workshop

作者： Ch. Bouras Ch. Tegos V. Triglianos Th. Tsiatsos Computer Engineering and Informatics Department(CEID) University of Patras Greece Research Academic Computer Technology Institute Greece Department of Informatics Research Academic Computer Technology Institute (CTI) Aristotle University of Thessaloniki Greece

It is well known that both space and the spatial organization play an important role in our work and learning environments as well as in everyday life. There is a definite need for many persons to design their space along with an expert and to preview it in order to test its functionality. Many times there is a need for the inhabitants and workers to collaborate in order to co-design their space from distance. Multi-user 3D virtual environments are a powerful form of collaborative telecommunication applications, enabling the users to share a common three dimensional space and interact with each other as well as with the environment surrounding them, in order to collaboratively solve problems or aid learning processes. This paper presents the work done for extending a multi-user virtual environments platform, to support collaborative spatial design applications. Furthermore, a usage scenario is presented concerning the collaborative design of a classroom for educational purposes.

关键词： Virtual environment Collaboration Collaborative work informatics Design engineering Space technology Application software Testing Internet Research and development

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Agent-based distributed group key establishment in wireless sensor networks

Agent-based distributed group key establishment in wireless ...

引用

2007 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WOWMOM

作者： Chatzigiannakis, Ioannis Konstantinou, Elisavet Liagkou, Vasiliki Spirakis, Paul Computer Technology Institute P.O. Box 1122 26110 Patras Greece Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Dep. of Information and Communication Systems Engineering University of the Aegean 83200 Samos Greece

ISBN: (纸本)1424409926

Wireless sensor networks are comprised of a vast number of ultra-small autonomous computing, communication and sensing devices, with restricted energy and computing capabilities, that co-operate to accomplish a large sensing task. Such networks can be very useful in practice, e.g. in the local monitoring of ambient conditions and reporting them to a control center. In this paper we propose a distributed group key establishment protocol that uses mobile agents (software) and is particularly suitable for energy constrained, dynamically evolving ad-hoc networks. Our approach totally avoids the construction and the maintenance of a distributed structure that reflects the topology of the network. Moreover, it trades-off complex message exchanges by performing some amount of additional local computations in order to be applicable at dense and dynamic sensor networks. The extra computations are simple for the devices to implement and are evenly distributed across the participants of the network leading to good energy balance. We evaluate the performance of our protocol in a simulated environment and compare our results with existing group key establishment protocols. The security of the protocol is based on the Diffie-Hellman problem and we used in our experiments its elliptic curve analog. Our findings basically indicate the feasibility of implementing our protocol in real sensor network devices and highlight the advantages and disadvantages of each approach given the available technology and the corresponding efficiency (energy, time) criteria. ©2007 IEEE.

关键词： Wireless sensor networks

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Multicost Routing in Wireless AD-HOC Networks with Variable Transmission Power

Multicost Routing in Wireless AD-HOC Networks with Variable ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： N. M. Karagiorgas P. C. Kokkinos C. A. Papageorgiou E. A. Varvarigos Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras Patras Greece

In this work we study the combination of multicost routing and variable transmission power in wireless ad-hoc networks. In multicost routing, each link is assigned a cost vector consisting of several parameters. These parameters are treated separately and are combined at the end of the algorithm using various optimization functions, corresponding to different routing schemes, for selecting the optimal path. The cost parameters we use are the hop count, the interference caused, the node residual energies, and the node transmission powers. We assume that nodes can use power control to adjust their transmission power to the desired level. The experiments conducted show that the combination of multicost routing and adjustable transmission power can lead to reduced interference and energy consumption, improving network performance and lifetime.

关键词： Routing Ad hoc networks Interference Power control computer networks Power engineering computing Energy consumption Cost function Power engineering and energy informatics

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Evolution of web applications with aspect-oriented design patterns

Evolution of web applications with aspect-oriented design pa...

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2nd International Workshop on Adaptation and Evolution in Web Systems Engineering, AEWSE 2007

作者： Bebjak, Michal Vranić, Valentino Dolog, Peter Institute of Informatics and Software Engineering Faculty of Informatics and Information Technology Slovak University of Technology Ilkovičova 3 84216 Bratislava 4 Slovakia Department of Computer Science Aalborg University Fredrik Bajers Vej 7 DK-9220 Aalborg EAST Denmark

It is more convenient to talk about changes in a domainspecific way than to formulate them at the programming construct level or-even worse-purely lexical level. Using aspect-oriented programming, changes can be modularized and made reapplicable. In this paper, selected change types in web applications are analyzed. They are expressed in terms of general change types which, in turn, are implemented using aspect-oriented programming. Some of general change types match aspect-oriented design patterns or their combinations.

关键词： Aspect oriented programming

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Scalable Data Collection Protocols for Wireless Sensor Networks with Multiple Mobile Sinks

Scalable Data Collection Protocols for Wireless Sensor Netwo...

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Annual Symposium on Simulation

作者： Athanasios Kinalis Sotiris Nikoletseas Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Data propagation in wireless sensor networks is usually performed as a multihop process. To deliver a single message, the resources of many sensor nodes are used and a lot of energy is spent. Recently, a novel approach is catching momentum because of important applications; that of having a mobile sink move inside the network area and collects the data with low energy cost. Here we extend this line of research by proposing and evaluating three new protocols. Our protocols are novel in a) investigating the impact of having many mobile sinks; b) in weak models with restricted mobility, proposing and evaluating a mix of static and mobile sinks; and c) proposing a distributed protocol that tends to equally spread the sinks in the network to further improve performance. Our protocols are simple, based on randomization and assume locally obtainable information. We perform an extensive evaluation via simulation; our findings demonstrate that our solutions scale very well with respect to the number of sinks and significantly reduce energy consumption and delivery delay

关键词： Wireless application protocol Wireless sensor networks Intelligent sensors Costs Monitoring Sensor phenomena and characterization Spread spectrum communication Energy consumption Contracts Batteries

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Burstification effect on the TCP synchronization and congestion window mechanism

Burstification effect on the TCP synchronization and congest...

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International Conference on Broadband Networks (BroadNets)

作者： Kyriakos G. Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

ISBN: (纸本)9781424414321

In this paper, we study the burstification effect on the TCP synchronization and TCP congestion window mechanism. It is shown that short assembly times are optimal for flows with similar characteristics, while large assembly time provide a higher notion of fairness. In addition, this paper analyzes the synchronization of multiple TCP flows when aggregated together over the same optical bursts. It is shown that there is a strong TCP synchronization effect upon burst losses, in the sense that flows’ windows increase/decrease simultaneously, resulting to a significant variation of outgoing traffic. These deficiencies may be dealt with employing a multi-queue burst assembly scheme with different timers and taking into account the TCP dynamics.

关键词： Assembly Delay Transport protocols Throughput Performance analysis informatics Image motion analysis Optical sensors Optical losses Traffic control

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A Power Control Scheme for Efficient Radio Bearer Selection in MBMS

A Power Control Scheme for Efficient Radio Bearer Selection ...

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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： Antonios Alexiou Christos Bouras Evangelos Rekkas Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

This paper proposes a power control scheme for the efficient radio bearer selection in the Multimedia Broadcast/Multicast Service (MBMS) framework of Universal Mobile Telecommunications System (UMTS). The choice of the most efficient transport channel in terms ofpower consumption is a key point for the MBMS since a wrong transport channel selection for the transmission of the MBMS data could result to a significant decrease in the total capacity of the system. Diferent UMTS transport channels are examined and an algorithm that defines the switching point between dedicated and common radio bearers is proposed The proposed MBMSpower control scheme selects the transport channel that reduces the Node B's transmission power in every cell of the network with multicast users.

关键词： Power control 3G mobile communication Energy consumption Broadcasting Power engineering computing Multimedia communication Broadcast technology Multicast algorithms Videoconference Power engineering and energy

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Multiple-Input and Shared Buffer Architectures for Asynchronous Optical Burst Switching Networks

Multiple-Input and Shared Buffer Architectures for Asynchron...

引用

IEEE International Conference on Communications (ICC)

作者： K. Yiannopoulos E. Varvarigos K. Vlachos Computer Engineering and Informatics Department and Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, we present the architectural design of optical burst-buffers that can truly emulate input queuing and accommodate asynchronous burst operation. The architectural design uses wavelength converters and fixed feed-forward delay lines that are combined to form either a multiple-input buffer or a shared buffer. Both schemes are modular, allowing the logarithmic expansion of buffer size with the number of switching elements (wavelength converters).

关键词： Optical buffering Optical burst switching Optical wavelength conversion Delay lines Buffer storage Optical design Optical feedback Optical fiber networks Propagation delay Feedforward systems

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A Framework for Providing Hard Delay Guarantees in Grid Computing

A Framework for Providing Hard Delay Guarantees in Grid Comp...

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IEEE International Conference on e-Science and Grid Computing

作者： Panagiotis Kokkinos Emmanouel A. Varvarigos Nikolaos D. Doulamis Department of Computer Engineering and Informatics University of Patras and Research Academic Computer Technology Institute Patras Greece

Future grid networks should be able to provide quality of service (QoS) guarantees to their users. In this work we propose a framework for grid networks that provides deterministic delay guarantees to its guaranteed service (GS) users and best effort service to its best effort (BE) users. The proposed framework is theoretically and experimentally analyzed. We also define four types of computational resources based on the type of users (GS, BE) these resources serve and the priority they give them. We implement the proposed QoS framework for grids and verify that it not only satisfies the delay guarantees given to GS users, but also improves performance in terms of deadlines missed and resource use. In our simulations, data from a real grid network are used, validating in this way the appropriateness and usefulness of the proposed framework.

关键词： Delay Grid computing Quality of service computer networks Resource management Computational modeling Processor scheduling informatics Optical fiber networks computer vision

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