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Smart Spaces embedded into our surroundings are dynamic in nature; variable types and amount of services and applications are provided by a set of interoperable devices and systems that are joining and leaving a space every now and then. Thus, the structure, functionality and quality properties of the space are changing at every turn. In order to understand, what devices/systems there are in the space,...
Video transmission over IP networks requires appropriate conditions of quality of service, in order to ensure the integrity of the image, which still represents a challenge to be overcome in wireless mesh networks due to traffic capacity limitations inherent to its architecture. In this work we evaluate the performance of high-resolution video over multi-hop mesh networks and we propose a suitable...
In envisioned smart environments, enabled by ubiquitous computing technologies, electronic objects will be able to interconnect and interoperate. How will users of such smart environments make sense of the connections that are made and the information that is exchanged? This Internet of Things could have a life of its own, exchanging digital concepts and values between its members, having an understanding...
Industrial applications for smart environments call for techniques and methodologies to improve interoperability, reusability, and easy integration with existing applications, thus reducing development costs and time-to-market. This paper presents a novel and practical approach to smart context-aware applications for the maintenance of large buildings, where ontology-based interoperability is exploited...
IEEE 802.11 Medium Access Control (MAC) protocol employs two techniques for packet transmission; the basic access scheme and the RTS/CTS-based reservation scheme. A parameter called RTS Threshold determines which scheme to use. If packet size is smaller than the RTS Threshold then the basic scheme is used otherwise the reservation scheme is used. With current standard, the RTS Threshold is fixed....
Quality of service (QoS) is a key problem in wireless environments where bandwidth is scarce and channel conditions are time varying and sometimes implies highly packet losses. IEEE 802.11b/g/a wireless LAN (WLAN) are the most widely used WLAN standards today, and the IEEE 802.11e QoS enhancement standard exists and introduces QoS support for multimedia applications. This paper presents a class based...
Social networks have changed the characteristics of the traditional Web and these changes are still ongoing. Nowadays, it is impossible to design valid strategies for content management, information dissemination and marketing in the context of a social network system without considering the popularity of its content and the characteristics of the relations among its users. By analyzing two popular...
The paper deals with the following topics: wireless sensor networks; peer-to-peer networks; distributed systems; pattern clustering; Web service; mobile networks; ad-hoc networks; Internet; virtual machines; data security; cryptography; traffic engineering computing; protocols; image processing; video signal processing; tourism computing; and interoperability.
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