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While wearable devices have been the buzzword inthese days, they are still in the infant market stage. Thoughdemand for wearable devices has skyrocketed, the early abandonmentof devices become an important issue. Many studiesexamine the usage of wearable devices with user survey. However,it is essential to look at the real behavior of wearable users howand why wearable users enjoy or abandon devices...
The wide spread of smart mobile devices such as tablets and phones makes mobile crowdsensing a viable approach for collecting data and monitoring phenomena of common interest. Smart devices can sense and compute their surroundings and contribute to mechanisms that examine social and collective behaviours. Crowdsensing offers a feasible alternative to exchange and compute sensing tasks and data between...
WiFi offloading has been exploited as a quick and viable solution to decrease the burden on cellular networks. In this paper, we study the problem of deploying new WiFi access points (AP) in a city-wide area for offloading purposes. Different than previous work which look at the problem only from operator's perspective and targets the maximization of offloaded traffic volume, we approach the problem...
This paper presents a novel system and method for saving battery life by master mobile station network search. The savings in battery life is achieved by preventing the system from constantly searching for available network(s). The protocol requires a mobile station to constantly search and acquire Public Land Mobile Network, other than Home Public Land Mobile Network. This search consumes battery...
In this paper, the authors propose a novel Cluster Head Rotation method to spare the cluster head burden in energy consumption. The clustering method, which is a state-of-the-art approach in D2D communication, is expected to reduce the devices’ energy consumption. However, this method may induce significant energy burden for cluster head, which can bring significant disproportion in cluster head and...
The incorporation of dynamic voltage scaling (DVS) technology into computation offloading could further reduce energy consumption of smart mobile device (SMD), which has not been fully studied. In this paper, this issue is formulated with jointly considering computational speed of SMD, transmit power of SMD, and the partial offloading, resulting in a nonconvex problem. To circumvent such a problem,...
Smartphones are here to stay, transforming how we communicate, collaborate and share in our everyday lives, providing a wide variety of applications. Smartphones are becoming more affordable, 3G and 4G networks expand and mobile applications offer a convenient way to access information. The current study aims to investigate smartphone and smartphone applications utilization by university students...
We consider a cellular network where intelligent cellular devices owned by selfish users are incentivized to cooperate with each other by using tokens, which they exchange electronically to “buy” and “sell” downlink relay services, thereby increasing the network's capacity. We endow each device with the ability to learn its optimal cooperation strategy online in order to maximize its long-term utility...
While for an automatic and autonomous indoor fall detection an enormous amount of different sensors is conceivable, for an outdoor fall detection only wearable sensors are applicable. For practical uses cases, it would be very beneficial if after a detected fall a medical alert is initiated. In indoor environments, a base station connected to a telephone line can handle these calls. On the road, this...
We investigated consumer attitudes towards energy consumption of mobile phones and mobile services with a questionnaire study among Finnish university students (N = 150). Our questions covered topics like how battery consumption affected phone and application selection and configuration, what effect different battery levels had on user behavior, what kind of recharging policies were used, how satisfied...
The purpose of the research proposed in this paper is to develop a Low-Power Tracking System, which can meet the special needs of the security of a mobile device. The system contains two parts: the GPS terminal in the module receives the locating information of the tracked device, and the control center. This paper discusses both hardware and software design of the tracking system. In the end, the...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
A low power reconfigurable DCT architecture is proposed, which can be run at three transform precision levels for different demands. Using the character of energy distribution of the DCT matrix after 2D DCT operation, we selected the best DCT bases which achieve considerable power reduction in DCT operation with minimum image quality degradation. The reconfigurable architecture can achieve power saving...
The increased availability of mobile broadband connec- tions enables the expansion of software downloads to mobile devices. This leads to greater number of available services and a better utilisation of the computational power of mobile devices. The downside of this increased software availability is an increase in the possible attack vectors. One scenario is the misuse of resources, for example,...
The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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