BACKGROUND To investigate the feasibility, the ease of implementation, and the extent to which community health workers with little experience of data collection could be trained and successfully supervised to collect data using mobile phones in a large baseline survey METHODS A web-based system was developed to allow electronic surveys or questionnaires to be designed on a word processor, se...

The work proposed a three-layer framework is proposed for mobile data collection in wireless sensor networks, which contains sensor layer, cluster head layer, and mobile collector (called SenCar) layer. The framework employ distributed load balanced clustering and dual data uploading, which is referred to as LBC-DDU. The objective is to achieve good scalability, and low data collection latency....

We present a design of a Mobile Grid Resource Management System aimed at integrating mobile resources to an existing Grid infrastructure, while creating a platform for interoperability with telecommunications providers. In order to reduce the load on an existing infrastructure, we separate responsibilities and run additional features on mobile resources. Finally we present the Ikaros-EG impleme...

Smartphones have become an essential part of our daily life. Besides providing voice and data communication, smartphones are also acquiring richer functionality through various sensors. For example, the iPhone 5 includes eight different sensors: accelerometer, GPS, ambient light, dual microphones, proximity sensor, dual cameras, compass, and gyroscope. These sensors are very useful for gatherin...

The data collection problem is one of the most important issues in Wireless Sensor Networks (WSNs). Constructing a tree from all sensor nodes to the sink node is the simplest way, but this raises the problem of energy unbalance since the sensors closer to the sink node would have much higher workloads from relaying data. To cope with the energy unbalance problem, a number of mobile-sink mechani...

One of the key components of current Web search engines is the document collector. This paper describes CoBWeb, an automatic document collector, whose architecture is distributed and highly scalable. CoBWeb aims at collecting large amounts of documents per time period, while observing operational and ethical limits in the crawling process. CoBWeb is part of the SIAM (Information Systems in Mobi...

Wireless sensors are employed in a wide range of applications. One common feature of most sensor settings is the need to communicate sensed data to some collection point or sink. This communication can be direct (to a mobile collector) or indirect – via other sensors towards a remote sink. In either case, a sensor might not be able to communicate to a sink at will. Instead it collects data and ...

Mobile Data Collectors (MDCs) can be employed to provide intermittent connectivity in partitioned Wireless Sensor Networks (WSNs). Typically, an MDC serves multiple partitions to collect their sensed data and relay it to the sink node if the sink is in one of the served partitions. If not, then the data needs to be passed to another MDC serving the sink partition at a certain rendezvous locatio...