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共 1467 条记录，以下是851-860 订阅

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An RFID and particle filter-based indoor spatial query evaluation system

An RFID and particle filter-based indoor spatial query evalu...

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16th International Conference on Extending Database Technology, EDBT 2013

作者： Yu, Jiao Ku, Wei-Shinn Sun, Min-Te Lu, Hua Dept. of Computer Science and Software Engineering Auburn University United States Dept. of Computer Science and Information Engineering National Central University Taiwan Dept. of Computer Science Aalborg University Denmark

ISBN: (纸本)9781450315975

People spend a significant amount of time in indoor spaces (e.g., office buildings, subway systems, etc.) in their daily lives. Therefore, it is important to develop efficient indoor spatial query algorithms for supporting various location-based applications. However, indoor spaces differ from outdoor spaces because users have to follow the indoor floor plan for their movements. In addition, positioning in indoor environments is mainly based on sensing devices (e.g., RFID readers) rather than GPS devices. Consequently, we cannot apply existing spatial query evaluation techniques devised for outdoor environments for this new challenge. Because particle filters can be employed to estimate the state of a system that changes over time using a sequence of noisy measurements made on the system, in this research, we propose the particle filter-based location inference method as the basis for evaluating indoor spatial queries with noisy RFID raw data. Furthermore, two novel models, indoor walking graph model and anchor point indexing model, are created for tracking object locations in indoor environments. Based on the inference method and tracking models, we develop innovative indoor range and k nearest neighbor (kNN) query algorithms. We validate our solution through extensive simulations with real-world parameters. Our experimental results show that the proposed algorithms can evaluate indoor spatial queries effectively and efficiently. © 2013 ACM.

关键词： Radio frequency identification (RFID)

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Towards a framework for adaptive resource provisioning in large-scale distributed agent-based simulation

Towards a framework for adaptive resource provisioning in la...

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Lecture Notes in computer science

作者： Hanai, Masatoshi Suzumura, Toyotaro Ventresque, Anthony Shudo, Kazuyuki Tokyo Institute of Technology Dept. of Mathematical and Computing Sciences 2-12-1 Ookayama MeguroTokyo152-8552 Japan School of Computer Science and Informatics University College Dublin Ireland Lero The Irish Software Engineering Research Centre Damastown Industrial Estate Mulhuddart Dublin 15 Ireland Smarter Cities Technology Centre IBM Research Damastown Industrial Estate Mulhuddart Dublin 15 Ireland

ISBN: (纸本)9783319143248

Large scale distributed agent-based simulations run on several computing units (e.g., virtual machines in the Cloud, nodes in a supercomputer). Classically, these systems try to (re-)load-balance the nodes as overloaded nodes slow down the *** another challenge in large scale distributed simulations is that the overall load evolves. In this paper we leverage on commodity computing to adapt resource provisioning (number of computing units) to the load during the execution of the simulation. We also propose an asynchronous migration mechanism that migrate workload between computing nodes efficiently when nodes wait for synchronisation barriers to happen. We validate our implementation on a scenario simulating one day of vehicular traffic in Tokyo, running on 2 to 8 machines depending on the demand. Our evaluation shows a 26% reduction in data migration time compared to a naive migration approach between computing units. © Springer International Publishing Switzerland 2014.

关键词： Supercomputers

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Heterogeneous Community-Based Routing in Opportunistic Mobile Social Networks

Heterogeneous Community-Based Routing in Opportunistic Mobil...

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IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems (MASS)

作者： Yunshen Wang Jie Wu Mingjun Xiao Daqiang Zhang Dept of Computer Science Kettering University Flint MI USA Dept. of Computer and Info. Sciences Temple University Philadelphia PA USA School of Computer Science and Tech. University of Science and Tech. of China Hefei P. R. China School of Software Engineering Tongji University Shanghai P. R. China

ISBN: (纸本)9781479960378

With the recent technical advances and popularization of smartphones, which are able to store, display, and transmit various types of media content, message forwarding in opportunistic mobile social networks has become a hot topic. In this paper, we propose a social-aware single-copy routing approach, which leverages the internal social feature information to resolve the social distance between the source and destination step-by-step. We introduce an optimal social feature forwarding set selection scheme for routing guidance, which is proven to achieve small message forwarding delay. We convert the routing process into an iterative 2-hop routing scheme, with a novel transition probability to measure the delivery delay of each hop. The transition probability is according to the community structure in each social feature space. Extensive simulations on both real and synthetic traces are conducted in comparison with several existing state-of-art approaches.

关键词： Routing Relays Delays Communities Mobile nodes

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Scalable security analysis in hierarchical attack representation model using centrality measures

Scalable security analysis in hierarchical attack representa...

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2013 43rd Annual IEEE/IFIP Conference on Dependable Systems and Networks Workshop, DSN-W 2013

作者： Hong, Jin B. Kim, Dong Seong Computer Science and Software Engineering Dept. University of Canterbury Christchurch New Zealand

ISBN: (纸本)9781479901814

Network security can be analysed using attack representation models (ARMs) (e.g., Attack Graphs (AGs) and Attack Trees (ATs)). One can analyse the network security by computing all possible attack scenarios, but it suffers from a scalability problem. We propose centrality based network security analysis by ranking important hosts based on network centrality measures, and vulnerabilities based on security metric values. We used two-layer hierarchical attack representation model to evaluate the network security, by taking into account importance of hosts and vulnerabilities in the upper and the lower layers, respectively. We define a new centrality measure based on the location of an attacker and a target. We simulate security analysis using centrality measures comparing with an exhaustive search method. Further, we investigate the performance when the location of the attacker is different in the network. © 2013 IEEE.

关键词： Network security

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Challenges in flexible safety-critical software development - An industrial qualitative survey

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14th International Conference on Product-Focused software Process Improvement, PROFES 2013

作者： Pedersen Notander, Jesper Höst, Martin Runeson, Per Software Engineering Research Group Dept. of Computer Science Lund University Sweden

ISBN: (纸本)9783642392580

Context. Development of safety-critical systems is mostly governed by process-heavy paradigms, while increasing demands on flexibility and agility also reach this domain. Objectives. We wanted to explore in more detail the industrial needs and challenges when facing this trend. Method. We launched a qualitative survey, interviewing engineers from four companies in four different industry domains. Results. The survey identifies human factors (skills, experience, and attitudes) being key in safety-critical systems development, as well as good documentation. Certification cost is related to change frequency, which is limiting flexibility. Component reuse and iterative processes were found to increase adaptability to changing customer needs. Conclusions. We conclude that agile development and flexibility may co-exist with safety-critical software development, although there are specific challenges to address. © 2013 Springer-Verlag.

关键词： software design

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PEP-side caching: An insider threat port

PEP-side caching: An insider threat port

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2013 IEEE 14th International Conference on Information Reuse and Integration, IEEE IRI 2013

作者： Yaseen, Qussai Althebyan, Qutaibah Jararweh, Yaser Dept. of Computer Science Yarmouk University Irbid Jordan Dept. of Software Engineering Jordan University of Science and Technology Irbid Jordan Dept. of Computer Science Jordan University of Science and Technology Irbid Jordan

ISBN: (纸本)9781479910502

PEP-side caching is used in request-response access control mechanisms to increase the availability and reduce the processing overhead on PDP. Nonetheless, this paper shows that using this approach may open an insider threat port that can be used to bypass access control models in cloud and distributed relational databases. Moreover, the paper proposes a light model that detects and prevents the threat without affecting the performance of PEP and PDP, and it keeps the advantages of PEP-side caching model. © 2013 IEEE.

关键词： Access control models

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A spatial keyword evaluation framework for network-based spatial queries 13

A spatial keyword evaluation framework for network-based spa...

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21st ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS 2013

作者： Zhang, Ji Ku, Wei-Shinn Jiang, Xunfei Qin, Xiao Dept. of Computer Science and Software Engineering Auburn University Auburn AL 36849 United States

ISBN: (纸本)9781450325219

An increasing number of spatial keyword query techniques that return qualified objects based on a comprehensive consideration of spatial and keyword constraints have been presented in the literature. Due to the complexity of the solutions to spatial keyword queries, systems that can effectively demonstrate the mechanisms will attract interest from the spatial database research community. However, very limited visualization systems have been developed for illustrating spatial keyword query evaluation. In this demonstration, we present a system that visualizes advanced solutions to efficiently answer the Spatial Keyword k Nearest Neighbor (SKkNN) query. With the two-level data management method and the friendly user interface implemented by the Standard Widget Toolkit (SWT) and Open Graphics Library (OpenGL), our system is able to not only interact with users in diverse manners, visualize datasets, and display the SKkNN query evaluation process, but it also helps users better understand the solutions in a more intuitive way. © 2013 Authors.

关键词： Location based services

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A dependency-sharing tool for global software engineering

A dependency-sharing tool for global software engineering

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2nd International Conference on Design, User Experience, and Usability: Web, Mobile, and Product Design, DUXU 2013, Held as Part of 15th International Conference on Human-computer Interaction, HCI International 2013

作者： Lee, Douglas Milewski, Allen E. Rosca, Daniela Dept. of Computer Science and Software Engineering Monmouth University West Long Branch NJ United States

ISBN: (纸本)9783642392528

This project explores the design of a tool to facilitate a common task that software engineers find difficult - the identification and management of dependencies between the many heterogeneous entities created in the course of a software development project. The focus of this tool is the value it might have during the maintenance phase. Maintenance engineers learn and understand the project differently from the original authors of the artifacts. Typically, they come to understand the project by investigating dependencies between entities- a task that can be very difficult and time-consuming. To deal with these differences, the Global software Traceability (GST) Tool was designed and prototyped to explore improvements in the usability of maintaining dependency links after the project has been deployed. The GST Tool is a proof-of-concept design prototype used to investigate how to make such a tool both useful and usable. The tool was successful in creating an environment whose overhead was low enough to make it likely that it would be used despite the severe time constraints found in software maintenance. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Curricula

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Cloud computing in electric vehicles charging control and dispatch optimization

Cloud computing in electric vehicles charging control and di...

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IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Dan Wu Bo Liu Zhijian Chen Wenyan Xie Xiang Huang Shuwei Pei Bin Sheng Donghan Feng Information Center China Southern Power Grid Co. Ltd. Dept. of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Network & Information Branch Guangdong Electric Power Design Institute Guangzhou China Chinese Academy of Sciences Institute of Software Beijing China Dept. of Electrical Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781479920327

Charging of large-scale electric vehicles will have a significant impact on the grid so that their charging schedule needs to be optimized. The traditional centralized scheduling method requires high performance in information exchange and computing. Based on the analysis of the features of electric vehicle charging load and the research of cloud computing, we propose a cloud computing based schedule platform for optimal charging of electric vehicles. In addition, the function and implementation of the three basic modules of the platform (the data collection module, the cloud computing center and the control center) are exposed. The platform performs well in optimal scheduling for electric vehicles. In addition, the platform can also make full use of the computing resource and reduce the communication congestion.

关键词： Electric vehicles Cloud computing Optimal scheduling Power grids

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Efficient geometric re-ranking for mobile visual search

Efficient geometric re-ranking for mobile visual search

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11th Asian Conference on computer Vision, ACCV 2012

作者： Luo, Junwu Lang, Bo State Key Laboratory of Software Development Environment Dept. of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9783642374838

The state-of-the-art mobile visual search approaches are based on the bag-of-visual-word (BoW). As BoW representation ignores geometric relationship among the local features, a full geometric constraint like RANSAC is usually used as a post-processing step to re-rank the matched images, which has been shown to greatly improve the precision but at high computational cost. In this paper we present a novel and efficient geometric re-ranking method. Our basic idea is that the true matching local features should be not only in a similar spatial context, but also have a consistent spatial relationship, thus we simultaneously introduce context similarity and spatial similarity to describe the geometric consistency. By incorporating these two geometric constraints, the co-occurring visual words in the same spatial context can be regarded as a "visual phrase"and significantly improve the discriminative power than single visual word. To evaluate our approach, we perform experiments on Star5k and ImageNet100k dataset. The comparison with the BoW method and Soft-assignment method highlights the effectiveness of our approach in both accuracy and speed. © 2013 Springer-Verlag.

关键词： Geometry

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