Matthew Tobiasz

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Large multi-touch displays are expanding the possibilities of multiple-coordinated views by allowing multiple people to interact with data in concert or independently. We present Lark, a system that facilitates the coordination of interactions with information visualizations on shared digital workspaces. We focus on supporting this coordination according to(More)
Nine healthy subjects (age 31 +/- 4 yr) exercised with and without expiratory-flow limitation (maximal flow approximately 1 l/s). We monitored flow, end-tidal PCO2, esophageal (Pes) and gastric pressures, changes in end-expiratory lung volume, and perception (sensation) of difficulty in breathing. Subjects cycled at increasing intensity (+25 W/30 s) until(More)
BACKGROUND To date only two controlled studies have been published on the effects of domiciliary oxygen treatment on survival in patients with chronic obstructive pulmonary disease (COPD) with advanced respiratory failure. The survival in such patients despite oxygen treatment remains poor. The prescription of long term oxygen therapy (LTOT) in less severe(More)
Although the factors associated with mortality, such as forced expiratory volume in one second (FEV1), arterial oxygen tension (Pa,O2) and pulmonary arterial pressure, have been well described, there is limited information on the circumstances of death in patients with chronic obstructive pulmonary disease (COPD). The aim of this study was to investigate(More)
Tabletop displays with touch-based input provide many powerful affordances for directly manipulating and collaborating around information visualizations. However, these devices also introduce several challenges for interaction designers, including discrepancies among the resolutions of the visualization, the tabletop's display, and its sensing technologies;(More)
Cognitive function, psychological status, and attitudes were investigated in 90 patients with chronic obstructive pulmonary disease before the initiation of long-term oxygen therapy and after one year of treatment. Assessment included clinical interview, Wechsler Intelligence Scale I.Q., Bourdon-Wiersma Test, Benton Verbal Retention Test, Rey's Test of(More)
Intrinsic positive end-expiratory pressure (PEEPi) due to dynamic hyperinflation has been measured as a plateau airway opening pressure during airway occlusion (PEEPi,stat). PEEPi has also been dynamically determined as a fall in esophageal pressure (Pes) before the inspiratory flow starts (PEEPi,dyn). The aims of the current study were to systematically(More)
OBJECTIVE To investigate effects of 6 years of domiciliary oxygen therapy on pulmonary hemodynamics in a large group of COPD patients. DESIGN Prospective longitudinal study with serial measurements. SETTING Research institute of pulmonary diseases. PATIENTS Ninety-five patients (72 men, 23 women), mean age 58+/-9 years, had COPD but were free of any(More)
We consider the problem of developing colour sequences that offer the best dynamic range when used for pseudocolouring. We began with nine colour sequences currently suggested for visualization and informally compared them to discover which was subjectively seen to have the most pleasing visual aesthetic. This comparison indicated that different colour(More)