2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)最新文献

Semi-Markov process based model for performance analysis of wireless LANs 基于半马尔可夫过程的无线局域网性能分析模型

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766962

M. Kadiyala, Dipti Shikha, R. Pendse, Neeraj Jaggi

{"title":"Semi-Markov process based model for performance analysis of wireless LANs","authors":"M. Kadiyala, Dipti Shikha, R. Pendse, Neeraj Jaggi","doi":"10.1109/PERCOMW.2011.5766962","DOIUrl":"https://doi.org/10.1109/PERCOMW.2011.5766962","url":null,"abstract":"In this paper, we propose a new semi-Markov process based model to compute the network parameters such as saturation throughput, for the IEEE 802.11 Distributed Coordination Function (DCF) employing the Binary Exponential Backoff (BEB). The backoff stages of BEB and their backoff intervals are modeled as the states of semi-Markov process and their state holding-times, respectively. The proposed model is simpler than Bianchi's two-dimensional Markov chain based model, with the number of states in the proposed model being of the order O(m), where m is the number of backoff stages in the BEB, compared with the Bianchi's model where number of states is of the order O(2m). Using the proposed semi-Markov process model, we compute the parameters of interest in wireless LANs, such as conditional collision probability, packet transmission probability, and saturation throughput. We show that the proposed model is quite accurate in computing these parameters of interest. Moreover, we show that the computation time with the proposed model is approximately one-tenth of that with Bianchi's model, using Matlab simulations. Thus, the proposed model achieves accurate results with less complexity and computation time, and is suitable to be used for performance evaluation of complex protocols such as IEEE 802.11e.","PeriodicalId":369430,"journal":{"name":"2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117180593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Intelligent information dissemination in collaborative, context-aware environments 协作、上下文感知环境中的智能信息传播

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766954

K. Frank, Matthias Röckl, T. Pfeifer

{"title":"Intelligent information dissemination in collaborative, context-aware environments","authors":"K. Frank, Matthias Röckl, T. Pfeifer","doi":"10.1109/PERCOMW.2011.5766954","DOIUrl":"https://doi.org/10.1109/PERCOMW.2011.5766954","url":null,"abstract":"Today's mobile computing environments aggregate many entities, all of them with a number of internal sensors, processing applications and other, user given information that can be shared with others over the available networks. Tomorrow's ubiquitous computing environments, where the number of sensors is assumed to be even significantly higher, face the challenge that information exchange between entities has to be controlled, not only to protect privacy and to unburden the wireless networks - but also to reduce load on the receiving entities that have to process all incoming information. The approach we propose in this work measures the importance of some information and the interest of the receiver in it, before it is transferred. We apply it in two scenarios with limited resources. In vehicle-to-vehicle communications the transmission time while cars meet and bandwidth availability of the wireless channel is the critical resource, forcing to reduce information exchange. In context inference on mobile devices processing power and battery life are limited and responsiveness to user actions is most important. Hence only the most important information should be processed.","PeriodicalId":369430,"journal":{"name":"2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124702682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Using context-profiling to aid access control decisions in mobile devices 使用上下文分析来帮助移动设备中的访问控制决策

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766891

Aditi Gupta, Markus Miettinen, N. Asokan

引用次数: 11

Radio-based trail usage monitoring with low-end motes 基于无线电的跟踪使用监测与低端motes

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766867

D. Puccinelli, Anna Förster, A. Puiatti, S. Giordano

引用次数: 10

Defining Situated Social Context for pervasive social computing 为普及社会计算定义情境社会背景

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766945

M. Endler, Alexandre Skyrme, Daniel Schuster, T. Springer

引用次数: 31

Analyzing the incentives in Community-based Security Systems 基于社区的安全系统激励分析

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766882

Pern Hui Chia

引用次数: 3

Channel assignment and routing in multiradio wireless mesh networks using smart ants 基于智能蚂蚁的多无线网状网络信道分配与路由

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766921

Fawaz S. Bokhari

引用次数: 8

Principles of genomic robustness inspire fault-tolerant WSN topologies: A network science based case study 基因组鲁棒性原理激发WSN容错拓扑:基于网络科学的案例研究

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766861

P. Ghosh, Michael L. Mayo, Vijender Chaitankar, T. Habib, E. Perkins, Sajal K. Das

{"title":"Principles of genomic robustness inspire fault-tolerant WSN topologies: A network science based case study","authors":"P. Ghosh, Michael L. Mayo, Vijender Chaitankar, T. Habib, E. Perkins, Sajal K. Das","doi":"10.1109/PERCOMW.2011.5766861","DOIUrl":"https://doi.org/10.1109/PERCOMW.2011.5766861","url":null,"abstract":"Wireless sensor networks (WSNs) are frameworks for modern pervasive computing infrastructures, and are often subject to operational difficulties, such as the inability to effectively mitigate signal noise or sensor failure. Natural systems, such as gene regulatory networks (GRNs), participate in similar information transport and are often subject to similar operational disruptions (noise, damage, etc.). Moreover, they self-adapt to maintain system function under adverse conditions. Using a PBN-type model valid in the operational and functional overlap between GRNs and WSNs, we study how attractors in the GRN-the target state of an evolving network-behave under selective gene or sensor failure. For “larger” networks, attractors are “robust”, in the sense that gene failures (or selective sensor failures in the WSN) conditionally increase their total number; the “distance” between initial states and their attractors (interpreted as the end-to-end packet delay) simultaneously decreases. Moreover, the number of attractors is conserved if the receiving sensor returns packets to the transmitting node; however, the distance to the attractors increases under similar conditions and sensor failures. Interpreting network state-transitions as packet transmission scenarios may allow for trade-offs between network topology and attractor robustness to be exploited to design novel fault-tolerant routing protocols, or other damage-mitigation strategies.","PeriodicalId":369430,"journal":{"name":"2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132042681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Secure cooperative MIMO communications under active compromised nodes 主动受损节点下的安全协同MIMO通信

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766865

Liang Hong, McKenzie McNeal, Wei Chen

{"title":"Secure cooperative MIMO communications under active compromised nodes","authors":"Liang Hong, McKenzie McNeal, Wei Chen","doi":"10.1109/PERCOMW.2011.5766865","DOIUrl":"https://doi.org/10.1109/PERCOMW.2011.5766865","url":null,"abstract":"Emerging cooperative MIMO communication is a promising technology in improving communication quality for wireless sensor networks. However, the security problems inherent to cooperative communications also arise. In this paper we investigate the situation where some of the cooperative nodes are compromised and try to corrupt the communications by sending garbled signals. To combat the compromised nodes, we extended our previous work and proposed compromised nodes detection algorithms for three more general scenarios. These scenarios include having different numbers of nodes in the transmitting and receiving clusters, having multiple compromised nodes in the transmitting cluster, and having multiple compromised nodes in both the transmitting and receiving clusters. These algorithms are then integrated into a cross-layer security scheme for secure cooperative MIMO network. This scheme combines cryptographic technique implemented in higher layers with proposed data assurance analysis at the physical layer to provide better security. Simulations show that the proposed algorithms for compromised nodes detection are effective and efficient. Simulations also show that the accuracy of received information is significantly improved.","PeriodicalId":369430,"journal":{"name":"2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132058392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Silhouette classification using pixel and voxel features for improved elder monitoring in dynamic environments 利用像素和体素特征进行剪影分类，以改善动态环境中老年人的监测

2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops) Pub Date : 2011-03-21 DOI: 10.1109/PERCOMW.2011.5766970

Erik E. Stone, M. Skubic

{"title":"Silhouette classification using pixel and voxel features for improved elder monitoring in dynamic environments","authors":"Erik E. Stone, M. Skubic","doi":"10.1109/PERCOMW.2011.5766970","DOIUrl":"https://doi.org/10.1109/PERCOMW.2011.5766970","url":null,"abstract":"We present a method for improving human segmentation results in calibrated, multi-view environments using features derived from both pixel (image) and voxel (volume) space. The main focus of this work is to develop a low-cost, vision-based system for passive activity monitoring of older adults in the home, to capture early signs of illness and functional decline and allow seniors to live independently. Silhouettes are extracted to address privacy concerns. Specific embedded assessment goals include daily gait, fall risk, and overall activity, as well as fall detection. To achieve these goals, accurate, robust segmentation of human subjects (silhouette extraction) from captured video data is required. We present a simple technique that makes use of features acquired from background subtraction results (silhouettes) of multiple calibrated cameras, along with the 3D voxel object formed from the intersection of those multiple silhouettes in a volume space to improve human segmentation results in dynamic environments; moving objects, non-human objects, and lighting changes often complicate this task. The technique is qualitatively evaluated on three data sequences, two of which were captured in an independent living facility for older adults.","PeriodicalId":369430,"journal":{"name":"2011 IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOM Workshops)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132314810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19