Pulse oximetry is a technique for estimating arterial oxygen saturation continuously and non-invasively. Reflectance pulse oximetry might become useful for monitoring the fetus during labour but it is much more susceptible to all kinds of physiological variations than the well-established transmission pulse oximetry for neonatal or adult monitoring. This review focuses on the accuracy of reflec...

Adequate coverage is one of the main problems for distributed wireless sensor networks and The effectiveness of that highly depends on the sensor deployment scheme. Given a finite number of sensors, optimizing the sensor deployment will provide sufficient sensor coverage and save power of sensors for movement to target location to adequate coverage. In this paper, we apply fuzzy logic system to...

People treat smartphones as a second skin, having them around nearly 24/7 and constantly interacting with them. Although smartphones are used mainly for personal communication, social networking and web browsing, they have many connectivity capabilities, and are at the same time equipped with a wide range of embedded sensors. Additionally, bluetooth connectivity can be leveraged to collect data...

Different applications require different sensor technologies and methods to achieve specific goals. Particular sensor designs are focused on solving problems. It is well-known that individual sensors can be limited when complex problems or applications are involved or the application requires sensing in different locations or even different geographical areas. We could think of robotic applicat...

Target tracking and localization are important applications in wireless sensor networks. In these applications, sensor nodes collectively monitor and track the movement of a target. They have limited energy supplied by batteries, so energy efficiency is essential for sensor networks. Most existing target tracking protocols need to wake up sensors periodically to perform tracking. Some unnecessa...

† Presently working at the Laboratories for Information Technology, 21 Heng Mui Keng Terrace, Singapore 119613 AbstractWireless sensor networks are widely used in data acquisition frameworks. Unlike conventional networked devices, wireless sensors run on low power energy sources, and have limited memory buffers, minimal computational complexity, and low processing speeds. As such, the complexit...

In this paper, we propose a robust control framework for object manipulation for when the robotic hand has limited knowledge of the grasp scenario. The framework considers a hand-object system subject to disturbances resulting from uncertainties in the object center of mass/inertia, hand kinematics, external wrenches, and contact locations. The framework guarantees semi-global asymptotic stabil...

A low-power (<10 mW) analog sensor capable of detecting ground vibration (i.e. seismic) signals and identifying their source possesses significant relevance in the field of national security. Very low power consumption by the sensor will allow long-term remote operation without battery replacement. A published frequency-domain algorithm was adapted for discrimination of foot and vehicle traffic...

Ras is a signaling protein involved in a variety of cellular processes. Hence, studying Ras signaling with high spatiotemporal resolution is crucial to understanding the roles of Ras in many important cellular functions. Previously, fluorescence lifetime imaging (FLIM) of fluorescent resonance energy transfer (FRET)-based Ras activity sensors, FRas and FRas-F, have been demonstrated to be usefu...