The rapid and accelerating move toward the adoption and use of mobile and wireless technologies creates opportunity for new research field-'mobile learning' that includes a variety of applications and new learning techniques. An efficient mobile learning system has to be sensitive to the context that characterizes the interactions between humans, applications and the surrounding environment. Researches in context aware mobile learning have concentrated on how to adapt applications to context. In this paper, we describe the design of a context aware middleware (with an emphasis on controlling the environment) with the aim of supporting M-learning. First, we identify contextual elements and their features relevant for mobile and collaborative learning. Then, we propose a middleware architecture for managing and adapting context which supports tasks including: acquiring, interpreting, modeling, storing, reasoning, updating and adapting context
{"title":"A middleware for adapting context to mobile and collaborative learning","authors":"J. Malek, A. Derycke, M. Laroussi","doi":"10.1109/PERCOMW.2006.10","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.10","url":null,"abstract":"The rapid and accelerating move toward the adoption and use of mobile and wireless technologies creates opportunity for new research field-'mobile learning' that includes a variety of applications and new learning techniques. An efficient mobile learning system has to be sensitive to the context that characterizes the interactions between humans, applications and the surrounding environment. Researches in context aware mobile learning have concentrated on how to adapt applications to context. In this paper, we describe the design of a context aware middleware (with an emphasis on controlling the environment) with the aim of supporting M-learning. First, we identify contextual elements and their features relevant for mobile and collaborative learning. Then, we propose a middleware architecture for managing and adapting context which supports tasks including: acquiring, interpreting, modeling, storing, reasoning, updating and adapting context","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132388830","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}
Different devices, such as mobile phones, soft phones, or desktop phones, have varying processing power, bandwidth, and media capabilities. Heterogeneous P2P voice systems that are built based on a set of capabilities will not be suitable for devices that have different capabilities. In this paper, we present an architecture for P2P voice systems that can dynamically change P2P overlay mechanisms to better suit different device, user, and feature requirements of a P2P voice system. As a first step towards realizing the architecture, we propose a P2P-SIP based architecture that separates out P2P mechanisms from SIP. Our architecture allows dynamic P2P structural changes, limits bloating of the SIP protocol, and lays a foundation for a flexible hierarchical system
{"title":"Dynamic peer-to-peer overlays for voice systems","authors":"K. Dhara, Salman Baset","doi":"10.1109/PERCOMW.2006.46","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.46","url":null,"abstract":"Different devices, such as mobile phones, soft phones, or desktop phones, have varying processing power, bandwidth, and media capabilities. Heterogeneous P2P voice systems that are built based on a set of capabilities will not be suitable for devices that have different capabilities. In this paper, we present an architecture for P2P voice systems that can dynamically change P2P overlay mechanisms to better suit different device, user, and feature requirements of a P2P voice system. As a first step towards realizing the architecture, we propose a P2P-SIP based architecture that separates out P2P mechanisms from SIP. Our architecture allows dynamic P2P structural changes, limits bloating of the SIP protocol, and lays a foundation for a flexible hierarchical system","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130862216","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}
Pub Date : 2006-03-13DOI: 10.1109/PERCOMW.2006.130
T. Hossfeld, Simon Oechsner, K. Tutschku, Frank-Uwe Andersen, L. Caviglione
Vertical handovers (VHO) are expected to be a key feature in beyond 3G (B3G) networks. This paper presents a pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to rapidly retrieve the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability
{"title":"Supporting vertical handover by using a pastry peer-to-peer overlay network","authors":"T. Hossfeld, Simon Oechsner, K. Tutschku, Frank-Uwe Andersen, L. Caviglione","doi":"10.1109/PERCOMW.2006.130","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.130","url":null,"abstract":"Vertical handovers (VHO) are expected to be a key feature in beyond 3G (B3G) networks. This paper presents a pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to rapidly retrieve the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129977369","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}
Wen-Cheng Ho, A. Smailagic, D. Siewiorek, C. Faloutsos
Environmental variations cause significant fluctuations in WiFi signals in the same location over time, rendering traditional RF-to-location pre-trained maps quickly obsolete. To solve this problem, we use a two-phase approach to determining the user's location. The first phase utilizes traditional pattern-matching to identify the general location, and a second phase applies logistic regression to distinguish between finer-grained locations. An adaptive calibration system allows the user to re-train and dynamically update the signal strength maps to account for the fluctuated signals. We show that our two-phase approach is able to achieve generally high accuracy (-95%) and over in areas of high signal fluctuations due to heavy access point and human density
{"title":"An adaptive two-phase approach to WiFi location sensing","authors":"Wen-Cheng Ho, A. Smailagic, D. Siewiorek, C. Faloutsos","doi":"10.1109/PERCOMW.2006.18","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.18","url":null,"abstract":"Environmental variations cause significant fluctuations in WiFi signals in the same location over time, rendering traditional RF-to-location pre-trained maps quickly obsolete. To solve this problem, we use a two-phase approach to determining the user's location. The first phase utilizes traditional pattern-matching to identify the general location, and a second phase applies logistic regression to distinguish between finer-grained locations. An adaptive calibration system allows the user to re-train and dynamically update the signal strength maps to account for the fluctuated signals. We show that our two-phase approach is able to achieve generally high accuracy (-95%) and over in areas of high signal fluctuations due to heavy access point and human density","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128716313","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}
This paper moves the discussion of pervasive learning from the domain of theory into the domain of practice. It provides an overview of a model of pervasive learning and discusses how the model was used to support the development of one type of pervasive learning environment, specifically, a pervasive learning game called ProjectY
{"title":"From theory to practice: on designing a pervasive learning game","authors":"Siobhan Thomas","doi":"10.1109/PERCOMW.2006.60","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.60","url":null,"abstract":"This paper moves the discussion of pervasive learning from the domain of theory into the domain of practice. It provides an overview of a model of pervasive learning and discusses how the model was used to support the development of one type of pervasive learning environment, specifically, a pervasive learning game called ProjectY","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"708 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122001251","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}
Pub Date : 2006-03-13DOI: 10.1109/PERCOMW.2006.112
Chunxiao Chigan, V. Oberoi
Wireless LANs will play a critical role in providing anywhere and anytime connectivity for ubiquitous telemedicine applications. This paper focuses on how to provide QoS over the wireless channel between the body sensor network (BSN) gateway and the wireless access points (e.g., wireless hotspots in various locations). In the telemedicine application, it usually requires the periodic data and the data related to the occurrence of emergencies to be reported to the remote health care in a timely manner. Unlike the traditional QoS techniques which support voice and data applications, the sporadic nature of the emergency data in telemedicine systems makes it nontrivial to provide sufficient QoS support. In this paper, we first investigated several alternative schemes for emergency QoS support in the telemedicine systems. An express dual channel (EDC) based QoS provisioning mechanism is then proposed. Not only is the proposed mechanism simple and resource efficient, but also it provides the minimum delay for the unpredictable emergency data transmission. Simulation results show the proposed EDC based solution provides satisfactory QoS for ubiquitous telemedicine applications
{"title":"Providing QoS in ubiquitous telemedicine networks","authors":"Chunxiao Chigan, V. Oberoi","doi":"10.1109/PERCOMW.2006.112","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.112","url":null,"abstract":"Wireless LANs will play a critical role in providing anywhere and anytime connectivity for ubiquitous telemedicine applications. This paper focuses on how to provide QoS over the wireless channel between the body sensor network (BSN) gateway and the wireless access points (e.g., wireless hotspots in various locations). In the telemedicine application, it usually requires the periodic data and the data related to the occurrence of emergencies to be reported to the remote health care in a timely manner. Unlike the traditional QoS techniques which support voice and data applications, the sporadic nature of the emergency data in telemedicine systems makes it nontrivial to provide sufficient QoS support. In this paper, we first investigated several alternative schemes for emergency QoS support in the telemedicine systems. An express dual channel (EDC) based QoS provisioning mechanism is then proposed. Not only is the proposed mechanism simple and resource efficient, but also it provides the minimum delay for the unpredictable emergency data transmission. Simulation results show the proposed EDC based solution provides satisfactory QoS for ubiquitous telemedicine applications","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122058992","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}
The design process of protocols for wireless sensor networks (WSNs) is primarily concerned with tackling special issues inherent to WSNs, such as limited energy (or battery power), computation, communication, and storage capabilities, with energy being the most crucial resource for sensor nodes. This paper proposes LAMaR, a location-aided and maximum remaining energy-based data dissemination protocol for WSNs, with a goal to prolong the network lifetime. LAMaR exploits the geometric properties of Voronoi diagram and introduces the concepts of proxy forwarders and intermediate forwarder chains to build energy-efficient dissemination paths. We show that LAMaR, which favors disseminating data over short distances, achieves an energy gain in the order of 55% for the free space model and close to 100% for the multi-path model compared to BVGF and GPSR, which forward data through long distances. We also prove that the use of proxy forwarders yields an energy gain in the order of 30% in comparison with a similar protocol which does not use the concept of proxy forwarders
{"title":"An energy-efficient data dissemination protocol for wireless sensor networks","authors":"H. Ammari, Sajal K. Das","doi":"10.1109/PERCOMW.2006.21","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.21","url":null,"abstract":"The design process of protocols for wireless sensor networks (WSNs) is primarily concerned with tackling special issues inherent to WSNs, such as limited energy (or battery power), computation, communication, and storage capabilities, with energy being the most crucial resource for sensor nodes. This paper proposes LAMaR, a location-aided and maximum remaining energy-based data dissemination protocol for WSNs, with a goal to prolong the network lifetime. LAMaR exploits the geometric properties of Voronoi diagram and introduces the concepts of proxy forwarders and intermediate forwarder chains to build energy-efficient dissemination paths. We show that LAMaR, which favors disseminating data over short distances, achieves an energy gain in the order of 55% for the free space model and close to 100% for the multi-path model compared to BVGF and GPSR, which forward data through long distances. We also prove that the use of proxy forwarders yields an energy gain in the order of 30% in comparison with a similar protocol which does not use the concept of proxy forwarders","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123322843","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}
We consider group key agreement (GKA) protocols, used by a group of peers to establish a shared secret key for multicast communications. There has been much previous work to improve the security, efficiency and scalability of such protocols. In our work, we describe secure schemes which utilize auxiliary channels in addition to that afforded by the open medium of radio. Such channels are often present in a human-centric pervasive ad-hoc networking scenario, though often neglected. We show that auxiliary channels can reduce public-key operations, reduce computational complexity, and strengthen security against an active adversary on the open channel, and against an eavesdropper on the auxiliary channels. Group key agreement protocols are usually often contextualized by their topology. We applied multi-channel schemes to different topologies, and found that the ideal topology may be different for different channels
{"title":"Multi-channel protocols for group key agreement in arbitrary topologies","authors":"Ford-Long Wong, F. Stajano","doi":"10.1109/PERCOMW.2006.98","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.98","url":null,"abstract":"We consider group key agreement (GKA) protocols, used by a group of peers to establish a shared secret key for multicast communications. There has been much previous work to improve the security, efficiency and scalability of such protocols. In our work, we describe secure schemes which utilize auxiliary channels in addition to that afforded by the open medium of radio. Such channels are often present in a human-centric pervasive ad-hoc networking scenario, though often neglected. We show that auxiliary channels can reduce public-key operations, reduce computational complexity, and strengthen security against an active adversary on the open channel, and against an eavesdropper on the auxiliary channels. Group key agreement protocols are usually often contextualized by their topology. We applied multi-channel schemes to different topologies, and found that the ideal topology may be different for different channels","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123105098","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}
Pub Date : 2006-03-13DOI: 10.1109/PERCOMW.2006.134
Faraz Rasheed, Young-Koo Lee, Sungyoung Lee
Ubiquitous computing envisions the era of computing where pro-active computing services are available to all any where, any time. In order to provide such pervasive services, an ubiquitous system collects a large amount of information continuously from its physical and computational environment. Managing and manipulating this information optimally is one of the most important aspects of ubiquitous computing system. We have proposed formal schemes for the storage and management of this information using the summarization techniques. We prepare aggregates or summary of information present in the repository and try only to use these summaries and aggregates most of the time for query processing. This approach not only saves the storage space but also results in efficient distributed and mobile data processing
{"title":"Towards using data aggregation techniques in ubiquitous computing environments","authors":"Faraz Rasheed, Young-Koo Lee, Sungyoung Lee","doi":"10.1109/PERCOMW.2006.134","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.134","url":null,"abstract":"Ubiquitous computing envisions the era of computing where pro-active computing services are available to all any where, any time. In order to provide such pervasive services, an ubiquitous system collects a large amount of information continuously from its physical and computational environment. Managing and manipulating this information optimally is one of the most important aspects of ubiquitous computing system. We have proposed formal schemes for the storage and management of this information using the summarization techniques. We prepare aggregates or summary of information present in the repository and try only to use these summaries and aggregates most of the time for query processing. This approach not only saves the storage space but also results in efficient distributed and mobile data processing","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122843484","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}
Pub Date : 2006-03-13DOI: 10.1109/PERCOMW.2006.104
H. Pourreza, P. Graham
Dynamically creating new, composite services "on the fly" using existing ones in a local interaction environment (e.g. a home, meeting room, airport lounge, etc.) presents challenging problems. In this paper, we describe a middleware model for such service composition targeted, initially, to a home area network (HAN) scenario. Being able to automatically synthesize new and useful services in a HAN (or other environment) without user intervention makes the use of the network simpler and more attractive for non-expert users (e.g. home owners). We propose a service composition model which involves third-party "service providers" (SPs) in the composition process thereby allowing the discovery of services without direction from the users as to what type of service is desired. We also discuss our experiences with our initial prototype system where ontology based matching is done by the service providers and the resulting composite service is deployed as a workflow using available in-home protocols (e.g. UPnP, Jini, etc.)
{"title":"On the fly service composition for local interaction environments","authors":"H. Pourreza, P. Graham","doi":"10.1109/PERCOMW.2006.104","DOIUrl":"https://doi.org/10.1109/PERCOMW.2006.104","url":null,"abstract":"Dynamically creating new, composite services \"on the fly\" using existing ones in a local interaction environment (e.g. a home, meeting room, airport lounge, etc.) presents challenging problems. In this paper, we describe a middleware model for such service composition targeted, initially, to a home area network (HAN) scenario. Being able to automatically synthesize new and useful services in a HAN (or other environment) without user intervention makes the use of the network simpler and more attractive for non-expert users (e.g. home owners). We propose a service composition model which involves third-party \"service providers\" (SPs) in the composition process thereby allowing the discovery of services without direction from the users as to what type of service is desired. We also discuss our experiences with our initial prototype system where ontology based matching is done by the service providers and the resulting composite service is deployed as a workflow using available in-home protocols (e.g. UPnP, Jini, etc.)","PeriodicalId":250624,"journal":{"name":"Fourth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PERCOMW'06)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116973707","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}
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