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In Content Delivery Networks (CDNs), knowing the popularity of video content helps the manager to take efficient decisions about which video content should be cached near the end users and also about the duplication degree of each video to satisfy the end user Quality of Experience. This paper focuses on predicting the popularity of video content, in terms of the number of requests. For that purpose,...
Parkinson's disease is a neurological disorder that affects about 1% of people over 60 years. The complexity of the disease difficult to carry out objective medical assessments of the level of tremors. This article presents a system which uses the accelerometer and gyroscope sensors in smartwatches to quantify the tremors in patients with Parkinson's disease. The system is based on a Wireless Body...
With the popularity of network, P2P-based Video on Demand (VoD) has become one of the main services in Internet. However, due to the huge amount of videos, how to access the video quickly is important since it affects the subscriber's experience. In this paper, a popularity-driven storing model is proposed to fasten the video discovery for a centralized P2P-VoD system. All videos are stored in a binary...
Wi-Fi is a cost-effective way to offload the increasing data traffic from cellular networks. However, users can only associate to one access point (AP) at a time, which limits the offloading performance in multiple hotspots scenario. In order to enhance the offloading performance and improve the utilization of Wi-Fi capacity as well, we propose a terminal-to-terminal (T2T) communication incorporated...
In-network guidance for off-path caching, called Breadcrumbs, has been proposed for cache networks. In Breadcrumbs, during content download, a router holds a pointer, breadcrumb, which denotes the latest download direction. When a content request occasionally encounters a breadcrumb along its default-path to the repository, location-based routing is switched to hop-by-hop breadcrumb-based routing...
Although accurate positioning systems are important to provide location-aware services, solutions that are applicable in high-rise areas and inside buildings have not yet been realized. We propose an accurate positioning system that utilizes widely and densely placed Wi-Fi access points. The proposed system utilizes probe request signals broadcast by mobile devices to estimate their positions. The...
A cost effective and easy to create security system that can be installed in the public as well as private transport system for the safety of the passengers is presented in this paper. The system is intended to increase the safety as well as provide security to the commuters especially females. A mechanical switch is provided near to the passenger which can be pressed under uncompromising situation...
We propose an end-to-end approach to describe the energy usage of video delivery within a content delivery framework, and use this to investigate the energy usage behavior of two popular coding schemes, namely, H.264/AVC and H.265/HEVC. Our study based on the proposed model is backed up by measurements of encoding and decoding energy usage of a sample video and shows that, from an end-to-end perspective,...
This study shows a system for radiation dosage aggregation by wireless communication. Environmental differences can have influence on the dosage in facilities like schools and factories. Especially in mountain forests, it could be more a significant difference, because fallen leaves would be piled in some areas easily but not in other areas. Therefore, it would be helpful if it were possible to measure...
Following the explosion of Internet-enabled mobile devices and mobile services, users tend to expect network connectivity everywhere they go and at any time. In anticipation of these higher connectivity expectations and requirements especially for vehicular communication, several technologies like WiMAX, cellular networks (i.e., 3G/4G) and wireless mesh networks have been developed. While cellular...
Recent studies show that the wireless technology could resolve the oversubscription issue in wireless data center networks (WDCNs). However, these works only focus on transmitting traffic flows at the top-of-rack (ToR) switch. In this paper, we propose a deadline-aware rate control scheme (DRCS) that detects the network congestion situation by considering the flow size, deadline, and the number of...
Industrial wireless sensor networks are often implemented as master-slave type configurations. In this paper, the problem of scheduling transmissions and retransmissions by the master node in order to meet real-time deadlines in the presence of interference is considered. When interference is present retransmissions may be necessary in order to increase reliability of delivery. As packet losses often...
The advances in embedded technology and automation makes the human daily life easier. In this study, a smart home is presented an application including sensor and controller nodes connected to the custom design local wireless network. User reaches to the system using a web-base interface or using a smart phone application. We tested our system through conducted experiments and the results will be...
Interference in the vicinity of wireless systems can cause serious degradation on radio communication performance. This may even result in disruptions and lost calls for communication systems or none or incorrect position for Global Navigation Satellite System (GNSS) receivers. For this purpose, a measurement system has earlier been developed with the aim to detect and log interference incidents....
This paper presents a conceptual framework for building a recommendation engine for use in the ubiquitous consumer wireless world (UCWW). The framework is based on the Lambda Architecture and as such provides real-time recommendations at the speed layer and off-time analytical operations at the batch layer. Moreover, at the speed layer, a root server is used for updating the real-time recommendation...
Data Center (DC) servers consume a huge amount of energy. However, a part of this energy (cooling and information technology devices) can be saved by shutting down racks containing idle servers. This can be achieved by rerouting workloads from partially loaded racks, and thus allowing additional racks to switch into idle mode. Workload rerouting requires additional wired links or by optical wireless...
Data Centers (DC) consume an enormous amount of energy, now accounting for about 1.5% of US electrical usage. However, part of this energy (server operation and cooling) can be saved by turning off idle servers. This can be achieved by rerouting workloads from partially loaded servers, and thus allowing additional idle servers to shut down. Workload rerouting could be done by optical wireless communication...
One of the main challenges in integrating wireless sensor networks with the Internet is the need of an intermediary mechanism for interconnecting two different protocols, i.e. Hypertext Transfer Protocol (HTTP) and Constrained Application Protocol (CoAP), allowing users to access the sensors over standard the Unified Resource Locator (URL). Such mechanism can be implemented using a cross-protocol...
On-demand data broadcast has been broadly utilized In wireless communication networks. With the rapid increase of on-demand data dissemination services in burgeoning applications, clients are not satisfied with one data item per request but turn to multiple data item per request, while most of the existing scheduling algorithms focus on single-item request environment. In this work, we lucubrate the...
With the ubiquity of mobile appliances, efficient wireless access has become an urgent need for mobile users. Efficient wireless access requires accurate radio signal maps. Unfortunately, most of solutions could not be applied to large-scale urban space. Crowdsensing schemes could leverage the smartphone to sense WiFi signals, but could not provide accurate map because of the intolerable noises in...
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