The level of hydration in the human body is carefully adjusted to control the electrolyte balance that governs the biochemical processes that sustain life. An electrolyte deficiency caused by deor overhydration will not only limit human performance, but can also lead to serious health problems and death if left untreated. Because humans can withstand a change in hydration of only ±20%, frequent...

In this thesis I develop and evaluate computational methods for extracting life’s patterns from wearable sensor data. Life patterns are the reoccurring events in daily behavior, such as those induced by the regular cycle of night and day, weekdays and weekends, work and play, eating and sleeping. My hypothesis is that since a “raw, low-level” wearable sensor stream is intimately connected to th...

C ontext awareness—determining a person’s current location and recognizing what he or she is doing—is a key functionality in many pervasive computing applications. Locationsensing techniques are based on either relative or absolute position measurements.1 Much of the current research in this area, described in the “Related Work” sidebar, uses absolute-measurement–based approaches (also called r...

The emergence of wireless technologies and advancements in on-body sensor design can enable change in the conventional health-care system, replacing it with wearable health-care systems, centred on the individual. Wearable monitoring systems can provide continuous physiological data, as well as better information regarding the general health of individuals. Thus, such vital-sign monitoring syst...

DOI: 10.1002/adma.201403560 neuronal photostimulation, [ 16 ] microelectrode arrays [ 10 ] and in vivo measurement of brain activity, [ 17 ] and a report of using an organic light-emitting diodes (OLEDs) light source for photodynamic therapy of skin cancer [ 18 ] in humans. In this communication, we demonstrate that OLEDs and organic photodiodes (OPDs) can be combined to make compact, non-invas...

Homeostasis of ionized calcium in biofluids is critical for human biological functions and organ systems. Measurement of ionized calcium for clinical applications is not easily accessible due to its strict procedures and dependence on pH. pH balance in body fluids greatly affects metabolic reactions and biological transport systems. Here, we demonstrate a wearable electrochemical device for con...

In this paper, we propose a user-centric software architecture for managing Ubiquitous Health Monitoring Data (UHMD) generated from wearable sensors in a Ubiquitous Health Monitoring System (UHMS), and examine how these data can be used within privacy-preserving distributed statistical analysis. Two are the main goals of our approach. First, to enhance the privacy of patients. Second, to decong...

The wearable sensor and feedback system presented in this paper is a type of audio-haptic display which contains onboard sensors, embedded sound synthesis, external sensors, and on the feedback side a loudspeaker and several vibrating motors. The so called “embedded sonification” in this case here is an onboard IC, with implemented sound synthesis. These are adjusted directly by the user and/or...