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RISS 인기검색어
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- 저자 : S. Ringer (검색결과 3 건)
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Cost–benefit analysis of remote sensing data types for mapping mosquito breeding sites
Zoltán Kenyeres,Norbert Bauer,László Bertalan,Gergely Szabó,András Márkus,Tamás Sáringer‑Kenyeres,Szilard Szabó 대한공간정보학회 2023 Spatial Information Research Vol.31 No.4
Environmentally friendly biological mosquito control by Bacillus thuringiensis var. israelensis formulations needs appropriate breeding maps. The mapping accuracy depends on the quality of the used remote sensing data. Further, the mapping is expected to be cost-effective. Our aim was to study the effect of the quality of various remote sensing data on the applicability of the maps. We depicted larval habitats by manual interpretation in Quantum GIS 3.16.1 software using remote sensing data of SENTINEL, Google Earth, commercial geoTIFF RGB orthophoto, individual unoccupied aerial systems (UAS) RGB, and multispectral mosaics. Based on our results, after classification of the target area by sorting, mixed-use of remote sensing data is required to achieve a highly cost-efficient mapping: RGB aerial photographs with 0.5 m per pixel resolution can be used efficiently in areas dominated by grassland habitats, while forest areas need customised footage taken by UAS or drones during the foliage-free period (15 cm per pixel resolution, multispectral technique). Our cost–benefit analysis showed that the aim-optimised method could reduce investment to 6–8% and the cost of data collection to 20–50% of the highest budget. This result is significant for all participants of biological mosquito control.
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Evidence for room temperature ferromagnetism in the In1-xCrxN system
R.J. Kinsey,P.A. Anderson,Z. Liu,S. Ringer,S.M. Durbin 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Despite considerable research on the nitride based dilute magnetic semiconductors (DMS) there is still considerable uncertainty as tothe origin of the room temperature ferromagnetism, with clusters and precipitates suggested. We have studied chromium doped indiumnitride (In1. xCrxN) withx varying from 0.005 to 0.04 and have observed room temperature ferromagnetic behaviour in all of our lmswithx within the growing lm suggests that it is on interstitial sites. We also do not see a signicant paramagnetic component in temperaturedependent magnetisation measurements, which also suggests that any superparamagnetic behaviour due to chromium clusters is not asignicant part of the magnetic behaviour. The magnitude of the ferromagnetic signal scales with the electron concentration in the lm,rather than the chromium concentration, which may suggest that In1. xCrxN shows the electron based equivalent of the hole mediatedferromagnetism observed in Ga1. xMn xAs.
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Yoo, Seung-Schik,Park, Hae-Jeong,Soul, Janet S.,Mamata, Hatsuho,Park, HyunWook,Westin, Carl-Fredrik,Bassan, Haim,Du Plessis, Adre J.,Robertson Jr, Richard L.,Maier, Stephan E.,Ringer, Steven A.,Volpe, J.B. Lippincott 2005 Vol. No.
OBJECTIVE:: The goal of this study was to test the feasibility of visualizing a 3-dimensional structure of cerebral white matter fiber tracts in preterm infants, postconceptional age (PCA) 28 weeks to term, by using volumetric diffusion tensor magnetic resonance imaging (DTI) data. MATERIALS AND METHOD:: We combined tractography algorithms and visualization methods, currently available for adult DTI data, to trace the pixelated principal direction of a diffusion tensor originating from regions-of-interest with high fractional anisotropy. Consequently, white matter fiber bundles from the genu and the splenium of corpus callosum, the corticospinal tracts, the inferior fronto-occipital fasciculi, and optic radiations were visualized. RESULTS:: Our results suggest that major white matter tracts of preterm infant brains, with PCAs ranging from 28 weeks to term (40 weeks old), can be successfully visualized despite the small brain volume and low anisotropy. CONCLUSION:: The feasibility of fiber tractography in preterm neonates with DTI may add a new dimension in detection and characterization of white matter injuries of preterm infants.
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