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As Wireless Sensor Network (WSN) has been widely accepted, the network is expected to be applied to environmental measure in yards and gardens. Because stable electric power supply is not available in environmental measure, WSN is generally powered by battery. Improving energy efficiency is important in order to extend operation time of WSN. On the other hand, in actual environmental measure, values...
As Wireless Sensor Network (WSN) has been widely accepted, the network is expected to be applied to environmental measure in yards and gardens. Because stable electric power supply is not available in environmental measure, WSN is generally powered by battery. Improving energy efficiency is important in order to extend operation time of WSN. On the other hand, in actual environmental measure, values...
This paper describes wireless wearable and ambient sensors that cooperate to monitor a person's vital signs such as heart rate and blood pressure during daily activities. Each wearable sensor is attached on different parts of the body. The wearable sensors require a high sampling rate and time synchronization to provide a precise analysis of the received signals. The trigger signal for synchronization...
A sensor network covering a large area enables connection to various types of sensors and actuators, but application development becomes complicated because of the uncontrollable behavior of such a large number of devices. We propose the u Tuple Space model for uniform and indirect communication with two extensions to the original tuple space model. The extensions enable efficient range search for...
This article presents a hybrid system of wireless sensor networks and active tags in order to monitor user's behaviors of handling objects. The sensor networks consist of an acceleration sensor node that the user carries and occupancy sensor nodes that are deployed in a workplace. The active tags, which are embedded with switch sensors, vibration sensors and occupancy sensors, are attached to objects...
We propose an improved decentralized method for environment control in wireless sensor/actuator networks. In our method, the objective function is defined to balance energy saving against control signal quality. Each sensor node calculates initial values in an iterative process for estimating optimal control signals using the sensor signals received from neighboring nodes. We evaluated its accuracy...
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