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Optimal wake-up mechanism for single base station with sleep mode

Optimal wake-up mechanism for single base station with sleep...

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International Teletraffic Congress, ITC 21

作者： Xueying Guo Sheng Zhou Zhisheng Niu P.R. Kumar Dept. of Electronic Engineering Tsinghua Univ Tsinghua National Laboratory for Information Science and Technology Beijing P.R. China Department of ECE Texas A&M Univ. College Station Computer Engineering and Systems Group TX USA

Base station (BS) sleeping is an effecting way to improve the energy-efficiency of cellular networks. Considering BS sleep mode operation under different scenarios, we focus on three wake-up policies: single vacation (SV) policy, multiple vacation (MV) policy and N policy. A hysteresis time is also considered to avoid frequent BS mode-changing operation. By modeling the systems.as M/G/1 vacation queues, we derive two performance measures of interest, expected system response time and energy consumption per bit. The impacts of sleep mode operation parameters and setup time are also studied. In order to determine the optimal parameter settings, which allows for a flexible tradeoff between energy-efficiency and mean delay, a two-step optimization method is proposed. We numerically analyze and investigate the energy-delay tradeoff for different policies, and find that both the MV policy and the N policy have better performance than the SV policy if the sniffing cost is not considered. However, these advantages diminish when the sniffing cost increases.

关键词： Delays Energy consumption Servers Power demand Quality of service Queueing analysis TV

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To crash or not to crash: Estimating its likelihood and potentials of beacon-based IVC systems

To crash or not to crash: Estimating its likelihood and pote...

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2012 IEEE Vehicular Networking Conference, VNC 2012

作者： Joerer, Stefan Segata, Michele Bloessl, Bastian Cigno, Renato Lo Sommer, Christoph Dressler, Falko Computer and Communication Systems Institute of Computer Science University of Innsbruck Austria Systems and Networks Dept. of Information Engineering and Computer Science University of Trento Italy

ISBN: (纸本)9781467349963

Is it possible to estimate some 'safety' metric to assess the effectiveness of Intelligent Transportation systems. In particular, we are interested in using Inter-Vehicle Communication (IVC) beaconing for increasing drivers' safety at intersections. In the last couple of years, the vehicular networking community reported in several studies that simple network metrics are not sufficient to evaluate safety enhancing protocols and applications. We present a classification scheme that allows the quantification of such improvements by determining how many potential crashes happen or can be avoided by a specific IVC approach. Using a modified road traffic simulator that allowed selected vehicles to disregard traffic rules, we investigated the impact of safety messaging between cars approaching an intersection. We show that in suburban environments simple beaconing is not as effective as anticipated. Yet, simple one-hop-relaying, e.g., by vehicles parked close to an intersection, can improve drivers' safety substantially. Since the key purpose of IVC is safety, the paper closes the loop in the evaluation of the effectiveness of vehicular networks as defined today. © 2012 IEEE.

关键词： Vehicles

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INTERACTIVE DOMAIN ADAPTATION TECHNIQUE FOR THE CLASSIFICATION OF REMOTE SENSING IMAGES

INTERACTIVE DOMAIN ADAPTATION TECHNIQUE FOR THE CLASSIFICATI...

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IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Persello, Claudio Dinuzzo, Francesco Max Planck Institute for Intelligent Systems Germany Dept. of Information Engineering and Computer Science University of Trento Italy

ISBN: (纸本)9781467311595

This paper presents a novel interactive domain-adaptation technique based on active learning for the classification of remote sensing (RS) images. The proposed method aims at adapting the supervised classifier trained on a given RS source image to make it suitable for classifying a different but related target image. The two images can be acquired in different locations and/or at different times, but present the same set of land-cover classes. The proposed approach iteratively selects the most informative samples of the target image to be labeled by the user and included in the training set, while the source-image samples are re-weighted or possibly removed from the training set on the basis of their disagreement with the target image classification problem. In this way, the consistent information available from the source image can be effectively exploited for the classification of a target image and for guiding the user in the selection of the new samples to be labeled, whereas the inconsistent information is automatically detected and removed. Experimental results on a Very High Resolution (VHR) multispectral dataset confirm the effectiveness of the proposed method.

关键词： Domain Adaptation Active Learning Image Classification Support Vector Machine

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A broadcast streaming method over ad hoc networks enabling high packet reachability and long battery lifetime

A broadcast streaming method over ad hoc networks enabling h...

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2012 9th Asia-Pacific Symposium on information and Telecommunication technologies, APSITT 2012

作者： Utsu, Keisuke Sano, Hiroshi Nishikawa, Hiroaki Ishii, Hiroshi Dept. of Communication and Network Engineering Sch. of Information and Telecommunication Engineering Tokai University Tokyo Japan Dept. of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki Japan

ISBN: (纸本)9784885522659

This paper considers cases where a specific number of nodes in an ad hoc network broadcast video and audio streams over the entire network. For the purpose, we have proposed Load and Battery Charge oriented Flooding (LBF), which reduces degradation in delivery quality, and energy consumption, and prevents nodes from being interrupted due to the complete discharge of their batteries. This paper describes an evaluation of the proposed method through network simulation. The simulation results indicate that the proposed method can prolong network running time without degradation of delivery quality. © 2012 IEICE Institute of Electronics Informati.

关键词： Energy utilization

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Materialized views for count aggregates of spatial data

Materialized views for count aggregates of spatial data

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16th East European Conference on Advances in Databases and information systems. ADBIS 2012

作者： Yaagoub, Anan Liu, Xudong Trajcevski, Goce Tanin, Egemen Scheuermann, Peter Dept. of Electrical Engineering and Computer Science Northwestern University Evanston United States Dept. of Computing and Information Systems University of Melbourne Melbourne VIC Australia

ISBN: (纸本)9783642330735

We address the problem of efficient processing of count aggregate queries for spatial objects in OLAP systems. One of the main issues affecting the efficient spatial analysis is the, so called, distinct counting problem. The core of the problem is due to the fact that spatial objects such as lakes, rivers, etc... - and their representations - have extents. We investigate the trade-offs that arise when (semi) materialized views of the count aggregate are maintained in a hierarchical index and propose two data structures that are based on the Quadtree indexes: Fully Materialize Views (FMV) and Partially Materialized Views (PMV). Each aims at achieving a balance between the: (1) benefits in terms of response time for range queries;(2) overheads in terms of extra space and update costs. Our experiments on real datasets (Minnesota lakes) demonstrate that the proposed approaches are beneficial for the first aspect achieving up to five times speed-up, while incurring relatively minor overheads with respect to the second one, when compared to the naïve approach. © 2012 Springer-Verlag.

关键词： Lakes

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Bringing IoT and cloud computing towards pervasive healthcare

Bringing IoT and cloud computing towards pervasive healthcar...

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6th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, IMIS 2012

作者： Doukas, Charalampos Maglogiannis, Ilias Dept. of Information and Communication Systems Engineering University of the Aegean Samos Greece Dept. of Computer Science and Biomedical Informatics University of Central Greece Lamia Greece

ISBN: (纸本)9780769546841

Pervasive healthcare applications utilizing body sensor networks generate a vast amount of data that need to be managed and stored for processing and future usage. Cloud computing among with the Internet of Things (IoT) concept is a new trend for efficient managing and processing of sensor data online. This paper presents a platform based on Cloud Computing for management of mobile and wearable healthcare sensors, demonstrating this way the IoT paradigm applied on pervasive healthcare. © 2012 IEEE.

关键词： Cloud computing

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Integrating semiotics perception in usability testing: A light weighted experiment on an E-health application

Integrating semiotics perception in usability testing: A lig...

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IADIS International Conference ICT, Society and Human Beings 2012, IADIS International Conference e-Commerce 2012, Part of the IADIS Multi Conference on computer science and information systems.2012, MCCSIS 2012

作者： Islam, Muhammad Nazrul Tétard, Franck Reijonen, Pekka Tarkkanen, Kimmo Turku Centre for Computer Science Åbo Akademi University Turku Finland Dept. of Information Technologies Åbo Akademi University Turku Finland Information Systems Science University of Turku Turku Finland

ISBN: (纸本)9789728939755

Interface signs (e.g., navigation links, buttons, icons, thumbnail, etc.), i.e. any element of a user interface, are crucial components to achieve satisfactory usability for web applications. End users typically get the system's logic through interface signs as the system's content and functions are usually directed by these. Consequently, interface signs need to be intuitive to the end users to improve the usability of web applications. Therefore, a clear need is depicted to assess interface signs' intuitiveness to the end users in usability testing. In order to assess this intuitiveness, a lightweight experiment was conducted on an e-health application's paper prototype. The study outcomes showed that integrating semiotics perception in usability testing yielded a number of benefits that contributed to the usability evaluation of the application. For instance, it (i) provided an overall idea on users' intuitiveness to interpret the intended/referential meaning of interface signs, (ii) conveyed the understandability (improving the users' interpretation accuracy) of interface signs, (iii) assisted to find the usability problems and also to recommend possible solutions, and (iv) received customer's contentment, and the like. © 2012 IADIS.

关键词： User interfaces

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An investigation on procrastination in the e-learning environment

An investigation on procrastination in the e-learning enviro...

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8th International Conference on information science and Digital Content Technology, ICIDT 2012

作者： Yang, Cheng-Ying Lai, Ah-Fur Chen, Ming-Chun Hwang, Ming-Hsiang Li, Cheng-Yi Dept. of Computer Science Taipei Municipal University of Education Taipei Taiwan Dept. of Psychology and Counseling Taipei Municipal University of Education Taipei Taiwan Dept. of Computer Science and Information Engineering Asia University Taichung Taiwan Dept. of Management Information Systems National Chung Hsing University Taichung Taiwan

ISBN: (纸本)9788988678695

E-learning without the constraints of time and space provide a flexible education environment. However, it leads the students to procrastinate in using the system. The purpose of this work is to find the factors that affect student's procrastination in the e-learning system. The questionnaire survey is used to investigate students' motivations, self-efficacy, and procrastination tendency. Also, the perceived usefulness, perceived ease of usage, attitude and intention to use the-learning system are investigated. Technology Acceptance Model (TAM) is employed to analyze the investigated factors. The results show the extrinsic motivations, amotivation, and perceived usefulness of an e-learning system increase the procrastination tendency. However, the self-efficacy and perceived ease of usage do not increase the procrastination tendency. Besides, the task value and intrinsic motivations do not have significant effects to the students' procrastination tendency. © 2012 AICIT.

关键词： Regression analysis

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An ontology-based recommender system for health information management

An ontology-based recommender system for health information ...

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2012 International Conference on Artificial Intelligence, ICAI 2012

作者： Romero, Francisco P. Ferreira-Satler, Mateus Olivas, Jose A. Serrano-Guerrero, Jesus Dept. Information Technologies and Systems University of Castilla La Mancha Ciudad Real Spain Dept. Computer Science Unviersidade Federal de Juiz de Fora Juiz de Fora MG Brazil

ISBN: (纸本)1601322178

This paper shows how some fuzzy logic techniques applied to a recommender engine can be used in a Electronic Medical Records Repository. A Fuzzy Linguistic model based on three dimensions: intrinsic, contextual, personal is proposed. The contextual and personal dimensions are modeled using domain ontologies and a automatically built fuzzy ontology, respectively. The experiment results indicate that the presented approach is useful and warrants further research in recommending and retrieval information.

关键词： Recommender systems

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Learning from early attempts to measure information security performance 5

Learning from early attempts to measure information security...

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5th Workshop on Cyber Security Experimentation and Test, CSET 2012

作者： Zhang, Jing Berthier, Robin Rhee, Will Bailey, Michael Pal, Partha Jahanian, Farnam Sanders, William H. Dept. of Computer Science and Engineering University of Michigan United States Information Trust Institute Dept. of Electrical and Computer Engineering University of Illinois at Urbana-Champaign United States Office of Information and Infrastructure Assurance University of Michigan United States BBN Technologies CambridgeMA United States

The rapid evolution of threat ecosystems.and the shifting focus of adversarial actions complicate efforts to assure security of an organization’s computer networks. Efforts to build a rigorous science of security, one consisting of sound and reproducible empirical evaluations, start with measures of these threats, their impacts, and the factors that influence both attackers and victims. In this study, we present a careful examination of the issue of account compromise at two large academic institutions. In particular, we evaluate different hypotheses that capture common perceptions about factors influencing victims (e.g., demographics, location, behavior) and about the effectiveness of mitigation efforts (e.g., policy, education). While we present specific and sometimes surprising results of this analysis at our institutions, our goal is to highlight the need for similar in-dept. studies elsewhere. © 2012 USENIX Association. All rights reserved.

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