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A data stream generated from hysteresis-based multi-scroll chaos is proposed in this paper. The mathematical model of the multi-scroll chaotic attractor is a continuous-time linear third-order system with a feedback of hysteresis-series. The pseudo random data stream is generated from the state values of the third-order systems at the instance of hysteresis switching. Thanks to the complicated dynamical...
Ubiquitous computing for context aware system collects information from many static and moving devices as well as sensor integrated objects. To provide valuable services, it is necessary to track the location of the users or objects. There are many possible applications that can apply location-assisted service such as child tracking, supermarket trolley alert system, firefighter tracking and many...
This paper presents an open testbed for studying the utilization of pervasive computing infrastructure in a city center. It comprises of different types of wireless networks, large public displays, middleware resources and monitoring tools. A set of examples demonstrating the applicability of the testbed in evaluating technology pilots and prototyping new services in authentic setting are presented...
Nowadays configuration parameters about network and service in intelligent terminals are getting more complex. Faults and security risks in the terminal are increasing. These have become key holdbacks for usage of services. So it is necessary to manage the terminals to keep them normal and promote satisfaction from customer. OMA and 3GPP have done researches about management of terminals. But there...
With rapid development of wireless technologies, current user mobile devices can support to access various wireless networks such as Wi-Fi 802.11 Wireless LANs, 3G cellular networks, etc. Due to requirements of multicast mobility for multimedia services, the convergence of wired and wireless network has been a necessary trend in Next Generation Networks (NGN). The issues of multicast and mobility...
This paper proposes a media synchronization method for real-time group communication within a multiple device environment. The method controls the output time of each media unit received at multiple devices and synchronizes them, even if the arrival time of the media unit temporarily fluctuates. This fluctuation is caused by variation in bandwidth and the network delay between different access networks...
The tremendous growth in ubiquitous low-cost wireless applications that utilize the unlicensed spectrum bands has laid increasing stress on the limited and scarce radio spectrum resources. Given that the licensed or Primary Users (PUs) are oblivious to the presence of unlicensed or Secondary Users (SUs), Cognitive Radio (CR) is a new paradigm in wireless communication that allows the SUs to detect...
Context-aware applications provide the user the ability to find and utilize services that are tailored to his current situation. Approaches, which support dynamic loading of the different elements of a mobile application, e.g., context sensors, adapted input and output components, or the business logic required for the use of location-based services provide an ecosphere for the development of mobile...
In a dynamic, heterogeneous environment, context-aware adaptation is a key concept to meet the varying requirements of different users. Connectivity is an important context source that can be utilized for optimal management of diverse networking resources. Application Quality of Service (QoS) is another important issue. This paper presents connectivity from the point of view of context awareness,...
Managing sensors, actuators and devices for supporting context-aware applications poses great challenges, such as the efficient coordination and cooperation among them, their self-configuration, as well as the management of their interactions. This papers aims at creating a middleware platform for the provision of the following functionalities: configurability, adaptability, heterogeneity and interoperability...
A variety of wireless access technologies provides todaypsilas users with pervasive access to critical content and applications. Guaranteeing a satisfactory quality of service requires reliable and ubiquitous delivery schemes that optimally use the available access technologies. This paper presents a novel architecture to support adaptive real-time data and multimedia applications over different wireless...
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