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As defined in the 3rd Generation Partnership Project specifications, a Universal Mobile Telecommunications System (UMTS) user device has to carry out two authentication steps to access multimedia services in IP Multimedia Subsystem (IMS). The first authentication step is used to gain UMTS General Packet Radio Service (GPRS) network admission. The second authentication step is the IMS authentication...
It becomes so important to observe a wild life for obtaining not only knowledge of its biological behaviors but also interactions with human beings in terms of geoenvironmental investigation and assessment. A sensor network is considered to be a suitable and powerful tool to monitor and observe a wild life in fields. In order to monitor/observe seabirds, a sensor network is deployed in Awashima island,...
P2P video streaming is a cost effective and scalable alternative for client-server based video delivery over the Internet. In P2P video streaming schemes, the Internet peers contribute their bandwidth for data dissemination in a multicast group. Since the performance of a P2P streaming system is dependent on contribution of the group members, free riders is one of the main challenges of such systems...
The smart grid is a new advanced electrical network promoted by the government to address environmental sustainability, energy generation, distribution and consumption efficiency issues. As one of the enabling technologies, Advanced Metering Infrastructure refers to systems which measure, collect and analyze energy usage, and interact with advanced devices such as smart meters through various communication...
Cloud computing has emerged to provide infrastructure for cost-effectively hosting applications with dynamically changing demands for computational resources. Dynamic resource allocation in cloud computing is made possible through virtualization technologies. In addition, live migration of services hosted in virtual machines (VMs) among multiple data centers is expected to add more flexibility in...
In this paper we propose a multipath video streaming mechanism based on the Scalable Video Coding (SVC) extension of H.264/AVC. Our method adapts to the heterogeneous capabilities of different end-users. Additionally, it adapts to network bandwidth fluctuation by observing the changes in the available bandwidth over the multiple overlay paths, and updating the streaming strategy accordingly. Results...
In cloud-computing environments, migration of virtual machines (VMs) between data centers can solve many problems such as load balancing and power saving. One of the difficulties in wide-area migration, however, is the “address-warping” problem, in which the address of the VM warps from the source server to the destination server. This confuses or complicates the status of the WAN, and the LANs connected...
Information presentation desktop applications such as media players, digital signage players are heavily encountered by us in our daily life. However current presentation oriented desktop application architectures are not flexible and less efficient in presenting a variety of information. Desktop applications rely on embedded files and the contents they present are bound to presentation layout. This...
Emailing has been and it is still continue to be the most common way for many people to share information using texts and/or with attachments. More popular alternatives nowadays are using the Instant Messengers (IM) and online community networks which convey presence information and provide higher degree of interactions with richer multimedia experience. However, these existing systems involve human...
6LoWPAN is for IPv6 packets to be sent to and received from over IEEE 802.15.4 based networks for applications which require wireless internet connectivity at lower data rates for devices. However it is well known that the management of addresses for devices that communicate across the two dissimilar domains of IPv6 and IEEE802.15.4 is complicated. Routing itself is another problem especially between...
Aiming at the problems of implementing the conventional IKE authentications such as pre-shared key and certificate-based Public Key Infrastructure (PKI), this paper proposes a new certificateless IKE authentication scheme. This scheme uses bilinear pairing to structure the framework of certificateless IKE authentication, solves the end to end IPSec security by removing the requirement of both nodes...
Ubiquitous Environments are defined that any user can discover and execute any service of any device in anywhere and at any time. In these days, there are many ubiquitous services such as Jini, DPWS, HAVi, and so on. They use different communication protocols and need different execution environments. Thus any ubiquitous service cannot find and execute ubiquitous services. Now days, lots of Bluetooth...
Recently, one of the most popular applications on the Internet is the social networking, such as, Facebook and Twitter. Finding resources using recent Peer-to-Peer (P2P) schemes in a social network has limits, such as distance problem between peers etc. So, in this paper, we present an efficient social P2P management scheme based on interesting keywords. We compare our proposal with the recent P2P...
With the advancement of Internet technologies and the widespread use of mobile devices, the number of users in conferencing services is increasing quickly. A P2PSIP conferencing system and an IP Multimedia Subsystem (IMS) conferencing system have been designed to provide conferencing services. The IMS conferencing system was developed to adapt to a server-based centralized system, while the P2P network,...
In recent years, in distributed cooperative systems such as distributed file systems and online games, equalization of performance between collaborative nodes is one of important issues as well as explicit performance such as bandwidth, delay and packet loss rate. Selection of the server which can offer equal performance to collaborative nodes is necessary to offer equalized performance. Therefore,...
In this paper, a ZigBee-based sensor network is realized and evaluations are carried out in order to clarify the fundamental performance of this sensor network. Life recording and management system is introduced as an example of ZigBee-based sensor networks, and the system is introduced into mobile WiMAX network in Azumino city in order to solve some medical problems in local cities. The following...
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