Effect of compression on detection in hyperspectral data Beaven, S.G.; Stein, D.; Stewart, S.
Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154),
2000, Letnik:
1
Conference Proceeding
Hyperspectral sensors typically obtain tens to hundreds of spectral bands having bandwidths in the 1-10 nm range. Methods for exploiting hyperspectral data commonly use a number of dimension-reducing ...tools for compression or dimensionality reduction. The motivation for using these methods is to express the relevant information in the data in a smaller dimensional space to improve the computational complexity, reduce bandwidth, improve estimation error, or aid in visualization. These methods may be applied as precursors to detection processing, and include principal components projection and vector quantization. These methods effectively compress the dominant components of scene data. However, because of their bias towards high population materials in the scene, they are not always effective in detection of low concentration materials in hyperspectral data. We examine the effect of these common transforms on detection of man-made materials in collected hyperspectral data and compare to a newly developed method that seeks to preserve detectability of rare events in hyperspectral data.
We have recently demonstrated that the iv administration of 0.6-60 micrograms/kg.day of acidic fibroblast growth factor (acidic FGF) increases thyroid weight in male and female rats. Interestingly, ...measurement of serum TSH and thyroid hormones in rats treated with 6 micrograms/kg.day acidic FGF for 30 days revealed only a slight increase in serum T4 and reverse T3 concentrations. Since thyroid function was only examined 24 h after the 30th daily treatment, we performed a series of experiments to evaluate the effects of acidic FGF on thyroid function following single and 6 multiple injections of acidic FGF. There was a small increase in the serum TSH concentrations at 2, 4, 8, and 24 h after a single high dose iv injection of acidic FGF (60 micrograms/kg). In contrast, serum T3 concentrations were slightly decreased at 2, 4, and 8 h after acidic FGF administration. There was no effect of a single injection of acidic FGF on serum T4, reverse T3, or thyroglobulin concentrations. After 6 days of treatment, there was a 34% increase in the thyroid weights of rats treated with acidic FGF. Analysis of serum hormones revealed a slight increase in serum TSH, T3, and T4 concentrations in acidic FGF-treated rats, but no change in serum reverse T3 or thyroglobulin concentrations. There was no effect of acidic FGF administration on thyroid radioiodine uptake, the intrathyroidal metabolism of radioiodine, or the relative amounts of thyroidal thyroglobulin or peroxidase messenger RNAs, or on liver 5'-deiodinase activity. In hypophysectomized rats, with no detectable levels of serum TSH, acidic FGF failed to increase thyroid weight. These data suggest that FGFs may participate with TSH in the regulation of thyroid weight and colloid accumulation, and that autocrine or paracrine growth factors may be involved in the pathogenesis of colloid goiter.
Background Permanent injuries to the vestibular end organs may occur in diving due to decompression illness (DCI) or barotraumas. This may lead to distressing long-term symptoms, including dizziness ...and disequilibrium. Aims To look for evidence of vestibular disorders in working divers and to relate this to diving exposure or injuries. Methods A cohort of 67 men aged 28 ± 5 years (mean ± SD) completing a basic course for working divers answered a questionnaire and underwent clinical otoneurological examination, electronystagmography (ENG), including alternate bithermal caloric tests and platform posturography. The procedure was repeated after 3 and 6 years. Results At follow-up, none of the divers had experienced inner ear barotraumas or inner ear DCI. Two cases of untreated probable DCI were diagnosed retrospectively in 27 232 dives. Middle ear barotrauma was reported by 36%. There was no correlation between diving frequency and postural sway at follow-up. Transient dizziness during or shortly after a dive was reported by 63 and 15%, respectively. The prevalence of dizziness on land and ENG abnormalities did not change during follow-up. No vestibular disorders were diagnosed. Conclusions Transient vestibular symptoms and middle ear barotraumas are common in diving. This study found no evidence of long-term vestibular effects. Vestibular disorders in divers are probably related to singular events, like inner ear barotraumas or inner ear DCI, rather than frequent diving per se.
The scalable coherent interface (SCI), a local or extended computer backplane interface being defined by an IEEE standard project (P1596), is discussed. the interconnection is scalable, meaning that ...up to 64 K processor, memory, or I/O nodes can effectively interface to a shared SCI interconnection. The SCI sharing-list structures are described, and sharing-list addition and removal are examined. Optimizations being considered to improve the performance of large system configurations are discussed. Request combining, a useful feature of linked-list coherence, is described. SCI's optional extensions, including synchronization using a queued-on-lock bit, are considered.< >
Many non-equilibrium phenomena have been discovered or predicted in optically-driven quantum solids
. Examples include light-induced superconductivity
and Floquet-engineered topological phases
. ...These are short lived effects that should lead to measurable changes in electrical transport, which can be characterized using an ultrafast device architecture based on photoconductive switches
. Here, we report the observation of a light-induced anomalous Hall effect in monolayer graphene driven by a femtosecond pulse of circularly polarized light. The dependence of the effect on a gate potential used to tune the Fermi level reveals multiple features that reflect a Floquet-engineered topological band structure
, similar to the band structure originally proposed by Haldane
. This includes an approximately 60 meV wide conductance plateau centered at the Dirac point, where a gap of equal magnitude is predicted to open. We find that when the Fermi level lies within this plateau, the estimated anomalous Hall conductance saturates around 1.8±0.4 e
/h.
Chromatin Gordon, J.A.R.; Grandy, R.A.; Lian, J.B. ...
Brenner's Encyclopedia of Genetics,
2013, 20130000, Letnik:
1
Reference, Book Chapter
Chromatin is a highly organized complex of DNA and proteins and is a principal component of the cell nucleus. Histone proteins help organize DNA into structural units called nucleosomes, which are ...then assembled into a compact structure (chromatin) and eventually into very large, high-order structures (chromosomes). The localized accessibility of chromatin is largely regulated by posttranslational modifications of both histone proteins and DNA, which have dramatic effects on the regulation of chromatin structure, binding of chromatin-modifying complexes, and transcriptional regulators. This article examines previously established and recently discovered roles of chromatin as a structural component of the nucleus and as a regulator of activation and repression of gene transcriptional activity.
Heparin-like anticoagulants in asthma Lasser, E C; Simon, R A; Lyon, S G ...
Allergy (Copenhagen),
November 1987, Letnik:
42, Številka:
8
Journal Article
Recenzirano
In a previous study, and in the present study, we have found that the baseline plasma samples of patients with asthma contain average levels of an endogenous heparin-like material (EHM) that is ...significantly higher than that noted in non-allergic, non-asthmatic controls. This material appears to have properties of both heparin and heparan sulfate. Three out of six patients responding to inhalational antigen challenge displayed an acute increment in EHM concentration that coincided with a fall in FEV values. The relation of EHM concentration to provoked asthma, or to asthma in general, remains to be determined.
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