Showing papers by "Daqing Zhang published in 2007"

Context-Aware Informative Display

Abstract: People have the desire to be always informed by the information to their importance everywhere and anytime. However, for some casual and relaxing occasions such as in home environment, information access and exhibition should be offered in a non-distracting and non-disruptive manner. To facilitate this goal and make use of embedded displays in smart home environments, this paper proposes a framework, i.e., context-aware informative display which offers a novel design for information representation catering for home and shared space users. The system architecture and techniques used are illustrated in details. Lastly, a prototype with several user cases is described to prove the workability of the framework.

Spontaneous and Context-Aware Media Recommendation in Heterogeneous Spaces

Abstract: While mobile users move from one smart space to another, it is highly desirable for them to access the right media contents from the overabundant media information in the right form with their own devices This paper deals with two important issues in pervasive media access: one is the spontaneous media access in heterogeneous environments, the other is the context-aware media recommendation in different spaces A general platform for spontaneous media access and context-aware media recommendation has been proposed and implemented The proposed hybrid recommendation algorithm shows quite good performance in heterogeneous environments

A semantic P2P framework for building context-aware applications in multiple smart spaces

Abstract: Context information has emerged as an important resource to enable autonomy and flexibility of ubiquitous applications. The widespread use of context information necessitates an efficient lookup service in a wide-area network over multiple smart spaces. In this paper, we propose a context lookup framework based on a semantic peer-to-peer network to support the building of context-aware applications in multiple smart spaces. Collaborative contextaware applications that utilize different context information in multiple smart spaces can be easily built by invoking a pull or push service provided by our framework. We describe the design of our system, demonstrate the development process of context-aware applications, and report the measurements obtained from our prototype.

A two-tier semantic overlay network for P2P search

Abstract: This paper proposes a two-tier semantic peer-to-peer network that facilitates efficient search for context information in wide-area networks. Context data with the same semantics are grouped together into a one-dimensional semantic ring space in the upper-tier network. This is achieved by applying an ontology- based semantic clustering technique and dedicating part of node identifiers to correspond to their data semantics. In the lower-tier network, peers in each semantic cluster are organized as Chord identifier space. Thus, all the nodes in the same semantic cluster know which node is responsible for storing context data triples they are looking for, and context queries can be efficiently routed to those nodes. Through the simulation studies, we demonstrate the effectiveness of our proposed scheme.

Context-Aware Framework for Spontaneous Interaction of Services in Multiple Heterogeneous Spaces

Abstract: With mobile devices and wireless hotspots becoming more prevalent, customers can desire greater access to media and services that can be achieved from the marrying of these two technologies. However, often existing devices need to be augmented with hardware and software to achieve this connectivity, and the existing services are heterogeneous and incompatible with one another. By leveraging the captive portal mechanism and proposed context-aware technologies, we propose a lightweight framework that can aggregate these services in smart spaces, and allow mobile users to spontaneously discover them without any specialized installation. In this paper, we present the system requirements for spontaneous interaction, the service framework design and implementation details.

A trustworthy framework for impromptu service discovery with mobile devices

Abstract: Wireless hotspots are permeating our workplace, home and public places bringing interesting services and spontaneous connectivity to mobile users. While it's ideal to enable the mobile clients to discover services automatically with the device-to-hand across the augmented physical spaces, it's equally important to guarantee the security and privacy of the mobile clients and service providers. In this paper, we propose a trustworthy framework that can support impromptu service discovery with mobile devices in WLAN enabled environments. Different from the existing service discovery approaches, the framework requires no specialized hardware or software installation in mobile client devices, it can preserve the privacy of mobile users during the authentication process by not requesting their identities. We prototyped a set of assistive services in a shopping mall which can be spontaneously discovered and accessed by a disabled person from his WLAN enabled mobile device, we show how both the security and privacy are achieved in a unified manner using trusted computing platforms.

Spontaneous interaction framework for thin-client access to services

Abstract: Many physical spaces such as homes, museums, airports and shopping malls are being augmented with computers, sensors, wireless hotspots to provide digital content and services. However, often specialized hardware and software are needed to access the services available in a particular space. This paper proposes a lightweight service framework which can aggregate services offered by heterogeneous devices and sources in a smart space and allow the users of currently available mobile clients, such as, smart phones, PDAs and Ultra-Mobile PCs, to spontaneously discover and access services in heterogeneous spaces. By leveraging a captive and service portal mechanism, the desirable services can be discovered and presented automatically to the mobile client of the user, while the mobile devices do not need to install any additional software or hardware. In this paper, we present the system requirements for spontaneous interaction, the service framework design and implementation details.

Supporting impromptu service discovery and access in heterogeneous assistive environments

Abstract: Wireless hotspots are permeating the globe bringing interesting services and spontaneous connectivity to mobile users. In order to enable the elderly and disabled to be fully integrated into the society, it's of paramount importance to build a pervasive assistive environment where assistive services can be automatically discovered and easily accessed with the device-to-hand across the physical spaces. In this paper, we propose a framework that can support impromptu service discovery and context-aware service access with mobile devices in heterogeneous assistive environments. Different from the existing approaches, the framework requires no specialized hardware or software installation in mobile client devices, it can automatically generate personalized user interfaces based on context such as user preference and device capability. To demonstrate the effectiveness of the framework, we prototyped a set of assistive services in public spaces like shopping malls, leveraging the OSGi-based platform accessible from any WLAN enabled mobile devices.