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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Scharsich, Maximilian Holl, Friedrich L. Univ. of Applied Sciences Brandenburg (Germany)

ISBN: (纸本)9780819489517

The following paper describes a method of gaining access to corporate networks through users who use virtual private networks over a modified Hotspot under the control of an attacker. Over 100,000 Hotspots offer an easy access to the Internet throughout the world. Almost every operator will inform the user though that browsing via a Hotspot is insecure because the connection is unencrypted. Hotspots often offer no typical encryption like WEP, WPA or WPA2;the communication is just send over the air, readable for everyone. This situation is not unknown - the Firesheep-Plugin for Firefox shows this impressive. One possible solution is the usage of a Virtual Private Network (VPN), which enables the user to communicate through a secure tunnel. In this typical business case the company's VPN is used to access internal documents and work with business' applications. All data sent out via a Hotspot using a VPN is encrypted and unreadable for potential attackers. But, what if the Hotspot, the user's connected to, is already under the control of an attacker? Nowadays it's easy to use hardware which extends the range of the Wi-Fi enormously and to set up an own Hotspot (with little expense). If an attacker then copies the login-site of a legit Hotspot and adapts his Hotspot in order to show the same site, he won't just be able to obtain the users credentials, he will also be capable of implementing malware into that site to gain access to the victim's personal device. Now that the attacker has gained access, he can start sniffing around and will possibly find out that a VPN application is being executed. If the attacker finds a proper application, he can start to use the victim's device to access the internal structure of the corporate network;the device now serves as a router for the attacker. Security mechanisms like firewalls and IDS, which are normally used as perimeter protection, won't be able to detect the attacker because he uses legitimate communication tunnels to get

关键词： Internet Control systems Network security Computer security Data communications Java multimedia Applied sciences Imaging systems Mobile devices

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Semantic storyboard of judicial debates: a novel multimedia summarization environment

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PROGRAM-ELECTRONIC LIBRARY AND INFORMATION systems 2012年第2期46卷 199-219页

作者： Fersini, E. Sartori, F. Univ Milano Bicocca DISCo Milan Italy

Purpose - The need of tools for content analysis, information extraction and retrieval of multimedia objects in their native form is strongly emphasized into the judicial domain: digital videos represent a fundamental informative source of events occurring during judicial proceedings that should be stored, organized and retrieved in short time and with low cost. This paper seeks to address these issues. Design/methodology/approach - In this context the JUMAS system, stem from the homonymous European Project (***), takes up the challenge of exploiting semantics and machine learning techniques towards a better usability of multimedia judicial folders. Findings - In this paper one of the most challenging issues addressed by the JUMAS project is described: extracting meaningful abstracts of given judicial debates in order to efficiently access salient contents. In particular, the authors present an ontology enhanced multimedia summarization environment able to derive a synthetic representation of judicial media contents by a limited loss of meaningful information while overcoming the information overload problem. Originality/value - The adoption of ontology-based query expansion has made it possible to improve the performance of multimedia summarization algorithms with respect to the traditional approaches based on statistics. The effectiveness of the proposed approach has been evaluated on real media contents, highlighting a good potential for extracting key events in the challenging area of judicial proceedings.

关键词： multimedia summarization Ontological query expansion multimedia Justice Information retrieval

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Optimimal resources utilization for indexing within a distributed multimedia retrieval system: An implementation for a video surveillance use case 18

Optimimal resources utilization for indexing within a distri...

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18th International Conference on Distributed multimedia systems, DMS 2012

作者： Codreanu, Dana Manzat, Ana-Maria Sedes, Florence Université de Toulouse IRIT UMR 5505 Toulouse31062 France

ISBN: (纸本)1891706322

Effective and flexible solutions for enabling reduced resource consumption and handling content and associated processing (indexing algorithms) diversity (in terms of location, technical characteristics, execution constraints, requested features) are essential in multimedia management systems. In this paper we present a distributed multimedia retrieval system that enables efficient and effective content processing and access. Though the system’s architecture is a generic one, in order to explain system’s functionalities we will present an instance of the architecture for a video surveillance use case. The proposed system addresses all important topic research concerning this type of systems (architecture, indexing, query) and proposes a novel two steps indexing approach (at acquisition time: implicit indexing and at query time: explicit indexing). We also present in this article how the user access management is done. © 2012 by Knowledge systems Institute Graduate School.

关键词： Indexing (of information)

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Design and Evaluation of Security Multi-Media Warnings for Children's Smartphones

Design and Evaluation of Security Multi-Media Warnings for C...

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Conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Menzel, Wiebke Tuchscheerer, Sven Fruth, Jana Kraetzer, Christian Dittmann, Jana Otto von Guericke Univ D-39016 Magdeburg Germany

ISBN: (纸本)9780819489517

This article describes primarily the development and empiric validation of a design for security warning messages on smartphones for primary school children (7-10 years old). Our design approach for security warnings for children uses a specific character and is based on recommendations of a paediatrician expert. The design criteria are adapted to children's skills, e. g. their visual, acoustic, and haptic perception and their literacy. The developed security warnings are prototypically implemented in an iOS application (on the iPhone 3G/4G) where children are warned by a simulated anti-malware background service, while they are busy with another task. For the evaluation we select methods for empiric validation of the design approach from the field of usability testing ("think aloud" test, questionnaires, log-files, etc.). Our security warnings prototype is evaluated in an empiric user study with 13 primary school children, aged between 8 and 9 years and of different gender (5 girls, 8 boys). The evaluation analysis shows, that nearly all children liked the design of our security warnings. Surprisingly, on several security warning messages most of the children react in the right way after reading the warning, although the meaning couldn't be interpreted in the right way. Another interesting result is, that several children relate specific information, e. g. update, to a specific character. Furthermore, it could be seen that most of the primary school test candidates have little awareness of security threats on smartphones. It is a very strong argument to develop e. g. tutorials or websites in order to raise awareness and teach children how to recognize security threats and how to react to them. Our design approach of security warnings for children's smartphones can be a basis for warning on other systems or applications like tutorials, which are used by children. In a second investigation, we focus on webpages, designed for children since smartphones and webpages (t

关键词： security warnings webpages children user-centered studies smartphones

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A Quality of Experience Handover System for Heterogeneous multimedia Wireless Networks

A Quality of Experience Handover System for Heterogeneous Mu...

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International Conference on Computing, Networking and Communications

作者： Carlos Quadros Eduardo Cerqueira Augusto Neto Antonio Pescapé Andre Riker Roger Immich Marilia Curado Federal University of Para Belém Brazil Federal University of Ceara Fortaleza Brazil University of Napoli Federico II Naples Italy University of Coimbra Coimbra Portugal

ISBN: (纸本)9781467352871

The convergence of emerging real-time multimedia services, the increasing coverage of wireless networks and the ever-growing popularity of mobile devices, are leading to an era of user-centric multimedia wireless services. In this scenario, heterogeneous communications will co-exist and ensure that the end-user is always best connected. However, the Quality of Experience (QoE) support for emerging video applications in multi-operator environments remains a significant challenge and is crucial for the success of wireless multimedia systems. This paper presents a Quality of Experience Handover Architecture for Converged Heterogeneous Wireless Networks, called QoEHand. QoEHand allows users of multimedia content to be always best connected in IEEE 802.11e and IEEE 802.16e environments. Simulation results show the impact and benefit of the proposed solution in multi-access and multi-operator wireless scenarios by using objective and subjective QoE metrics.

关键词： Video Streaming QoE Wireless networks

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Adaptive Synchronization Control with Multi-level Buffer in Wireless multimedia Sensor Networks

Adaptive Synchronization Control with Multi-level Buffer in ...

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8th IEEE International Conference on Distributed Computing in Sensor systems (DCOSS)/IWSN/WiSARN/PWSN

作者： Zhao, Guotao Ma, Huadong Sun, Yan Luo, Hong Liu, Liang Beijing Univ Posts & Telecommun Beijing Key Lab Intelligent Telecomm Software & M Beijing 100876 Peoples R China

ISBN: (纸本)9780769547077

In Wireless multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content is usually performed based on the resource-constrained sensors. Traditional synchronization control algorithms fail to run on the low-end hardware platform. In this paper, we propose an adaptive synchronization control scheme with multi-level buffer to address this problem. Main contributions of this paper are as follows. (i) To overcome the resource constraint of WMSNs, we perform the synchronization control in a distributed way by combining the sensors in the stream transmission path. (ii) By evaluating the current network state, we adjust the level number of the buffer adaptively to balance the delay and delay jitter. (iii) Through analyzing the buffer state of each level, we propose an efficient packet scheduling scheme to reduce the delay jitter actively. (iv) We implement the proposed scheme and verify its effectiveness in our practical WMSNs platform. The experiment results show that the proposed scheme can maintain the streams synchronization effectively with the low-end sensors.

关键词： synchronization control wireless multimedia sensor networks collaborative in-network processing

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HybCAST: Rich content Dissemination in Hybrid Cellular and 802.11 Ad Hoc Networks

HybCAST: Rich Content Dissemination in Hybrid Cellular and 8...

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31st IEEE International Symposium on Reliable Distributed systems (SRDS)

作者： Ngoc Minh Do Hsu, Cheng-Hsin Venkatasubramanian, Nalini Univ Calif Irvine Dept Comp Sci Irvine CA 92697 USA Natl Tsing Hua Univ Dept Comp Sci Hsinchu Taiwan

ISBN: (纸本)9780769547848;9781467323970

We design, implement, and evaluate a middleware system, HybCAST, that leverages a hybrid cellular and ad hoc network to disseminate rich contents from a source to all mobile devices in a predetermined region. HybCAST targets information dissemination over a range of scenarios (e. g., military operations, crisis alerting, and popular sporting events) in which high reliability and low latency are critical and existing fixed infrastructures such as wired networks, 802.11 access points are heavily loaded or partially destroyed. HybCAST implements a suite of protocols that: (i) structures the hybrid network into a hierarchy of two-level ad hoc clusters for better scalability, (ii) employ both data push and pull mechanisms for high reliability and low latency dissemination of rich content, and (iii) implement a near-optimal gateway selection algorithm to minimize the transmission redundancy. To demonstrate its practicality and efficiency, we have implemented and deployed the HybCAST middleware on several Android smartphones and an in-network Linux machine that acts as a dissemination server. The system is evaluated via real experiments using a UMTS network and extensive packet-level simulations. Our experimental results from a live network show that HybCAST achieves 100% reliability with shorter latencies and lower overall energy consumption. Simulation results confirm that HybCAST outperforms other state-of-the-art systems in the literature. For example, HybCAST exhibits a 5 times reduction in the dissemination latencies as compared to other hybrid dissemination protocols, while its energy consumption is a third of a cellular-only dissemination system. Furthermore, the simulation results demonstrate that HybCAST scales well and maintains good performance under varying numbers of mobile devices, diverse content sizes, and device mobility.

关键词： Middleware dissemination multimedia reliability wireless networks approximation algorithms

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Proceedings of SPIE-IS and T Electronic Imaging - multimedia on Mobile Devices 2011;and multimedia content access: algorithms and systems V

Proceedings of SPIE-IS and T Electronic Imaging - Multimedia...

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multimedia on Mobile Devices 2011;and multimedia content access: algorithms and systems V

ISBN: (纸本)9780819484185

The proceedings contain 37 papers. The topics discussed include: mobile 3D quality of experience evaluation: a hybrid data collection and analysis approach;overcome the shortcoming in mobile stereoscopy;comparative study of autostereoscopic displays for mobile devices;subjective evaluation of mobile 3D video content: depth range versus compression artifacts;development of 3D mobile receiver for stereoscopic video and data service in T-DMB;a right scaled depth sense formed by using a distorted objective space based on CG stereoscopy;smart travel guide: from internet image database to intelligent system;revised benchmarking of contact-less fingerprint scanners for forensic fingerprint detection: challenges and results for chromatic white light scanners (CWL);and optimizing bandwidth and storage requirements for mobile images using perceptual-based JPEG recompression.

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网路多媒体服务之使用者经验品质量测与提供

网路多媒体服务之使用者经验品质量测与提供

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作者：吴辰杞国立台湾大学

学位级别：博士

随着宽频网路的快速发展与高度普及，网路多媒体服务（例如网路电话和线上游戏）已经成为许多使用者在日程生活的一部分。另外，科技的进步使得各式运算装置的效能大幅提升，越来越多的使用者透过平板电脑和智慧型手机连结网际网路，已... 详细信息

随着宽频网路的快速发展与高度普及，网路多媒体服务（例如网路电话和线上游戏）已经成为许多使用者在日程生活的一部分。另外，科技的进步使得各式运算装置的效能大幅提升，越来越多的使用者透过平板电脑和智慧型手机连结网际网路，已经不只局限于桌上型电脑或笔记型电脑。由于运算装置效能和网路环境的异质性，让使用者在任何运算装置和网路环境上都能获得良好的服务品质，成为网路多媒体服务提供者的重要目标。然而，服务提供者必须先了解如何的服务品质才能够满足使用者的需求。我们在这篇论文探讨如何量测网路多媒体服务带给使用者的经验品质，以及探讨系统层面的效能因素如何影响网路多媒体服务的品质。首先我们提出基于群众外包概念的实验架构，能够有效且可靠地评估使用者对于多媒体服务品质的经验品质与满意程度。接着我们尝试了解网路电话系统如何透过调整收话端的拨放延迟机制，提供使用者良好的经验品质。另外，由于现今的网际网路无法保证资料传输品质，我们提出一个能够侦测点对点档案分享流量的机制，可用在网路管理上以提升网路服务效能。我们的主要贡献可分为三点：（一）运用我们提出的群众外包式多媒体服务的经验品质量测架构，可以有效率和经济地从广大受试者群体收集实验资料，并且能够保证实验结果的可靠度。（二）我们探讨三个热门的网路电话系统的拨放延迟机制，并指出这些系统可借由改善它们的机制而提供使用者更好的服务品质。（三）我们提出的点对点档案分享流量侦测机制能够达到很高的侦测率，能够对于网路服务品质提供带来很大的助益。

关键词：群众外包播放缓冲多媒体服务配对比较同侪式运算经验品质服务品质网路流量辨识网路电话

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IRMA code ii A new concept for classification of medical images

IRMA code II A new concept for classification of medical ima...

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Workshops Bildverarbeitung fur die Medizin: Algorithmen - Systeme - Anwendungen, BVM 2012 - Workshop on Image Processing for Medicine: algorithms - systems - Applications, BVM 2012

作者： Piesch, Tim-Christian Müller, Henning Kuhl, Christiane K. Deserno, Thomas M. Department of Medical Informatics RWTH Aachen University Germany Medical Informatics Geneva University Hospitals Univ. of Geneva Switzerland Business Information Systems HES-SO Switzerland Department of Diagnostic and Interventional Radiology University Hospital Aachen Germany

ISBN: (纸本)9783642285011

content-based image retrieval (CBIR) provides novel options to access large repositories of medical images. Thus, there are new opportunities for storing, querying and reporting especially within the field of digital radiology. This, however, requires a revisit of nomenclatures for image classification. The Digital Imaging and Communication in Medicine (DICOM), for instance, defines only about 20, partly overlapping terms for coding the body region. In 2002, the Image Retrieval in Medical Applications (IRMA) project has proposed a mono-hierarchic, multi-axial coding scheme. Although the initial concept of the IRMA Code was designed for later expansion, the appliance of the terminology in the practice of scientific projects discovered several weak points. In this paper, based on a systematic analysis and the comparison with other relevant medical ontologies such as the Lexicon for Uniform Indexing and Retrieval of Radiology Information Resources (RadLex), we accordingly propose axes for medical equipment, findings and body positioning as well as additional flags for age, body part, ethnicity, gender, image quality and scanned film. The IRMA Code ii may be used in the Cross Language Evaluation Campaign (CLEF) annotation tasks as a database of classified images to evaluate visual information retrieval systems. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Terminology

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