The Spaceborne Infrared Sounder for Geosynchronous Earth Orbit (SIRAS-G) is an infrared spectrometer being developed at Ball Aerospace & Technologies under IIP that offers significant benefits for future Earth and planetary science missions. SIRAS-G, selected for development under NASA’s 2002 Instrument Incubator Program (IIP-4), is an instrument concept of lower mass and power than contemporar...

In bridge health monitoring, tiltmeters have been used for measuring rotation and curvature; however, their application in dynamic parameter identification has been lacking. This study installed fiber Bragg grating (FBG) tiltmeters on the bearings of a bridge and monitored the dynamic rotational angle. The dynamic features, including natural frequencies and mode shapes, have been identified suc...

Following a brief discussion of 'classical' competitive learning and of approaches that involve mixtures of experts, we concentrate on competitive learning guided by temporal structure present in the stimuli. In this context, we suggest a general principle for resource allocation and memory management, which may be able to account for a range of psychophysical and neurophysiological ndings. 1 B...

Results. Measurable scores for both letter and grating acuity were obtained from 1694 eyes at 3 ' / 2 years and 2101 eyes at 4V2 years. Correlation analysis showed that the relation between crowded HOTV and grating acuity scores was best described by a quadratic function, with r values of 0.57 at 3 '/2 years and 0.68 at 4 '/2 years. Difference scores were calculated for each eye by subtracting ...

We present an 8 × 8 wavelength-routing switch (WRS) that monolithically integrates tunable wavelength converters (TWCs) and an 8 × 8 arrayed-waveguide grating. The TWC consists of a double-ringresonator tunable laser (DRR TL) allowing rapid and stable switching and a semiconductor-optical-amplifier-based optical gate. Two different types of dry-etched mirrors form the laser cavity of the DRR TL...