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RISS 인기검색어
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- 저자 : (K . J . Koehler) (검색결과 7 건)
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김광수(K . S . Kim),(S . E . Taylor),(M . L . Gleason),(K . J . Koehler) 한국농림기상학회 2002 한국농림기상학회지 Vol.4 No.1
Sets of weather variables for estimation of LWD were evaluated using CART(Classification And Regression Tree) models. Input variables were sets of hourly observations of air temperature at 0.3-m and 1.5-m height, relative humidity(RH), and wind speed that were obtained from May to September in 1997, 1998, and 1999 at 15 weather stations in Iowa, Illinois, and Nebraska, USA. A model that included air temperature at 0.3-m height, RH, and wind speed showed the lowest misidentification rate for wetness. The model estimated presence or absence of wetness more accurately (85.5%) than the CART/SLD model (84.7%) proposed by Gleason et al. (1994). This slight improvement, however, was insufficient to justify the use of our model, which requires additional measurements, in preference to the CART/SLD model. This study demonstrated that the use of measurements of temperature, humidity, and wind from automated stations was sufficient to make LWD estimations of reasonable accuracy when the CART/SLD model was used. Therefore, implementation of crop disease-warning systems may be facilitated by application of the CART/SLD model that inputs readily obtainable weather observations.
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Neutron Cross-Section Measurements on Structural Materials at ORELA
K. H. Guber,P. E. Koehler,D. Wiarda,J. A. Harvey 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron capture experiments, using isotopically enriched and natural samples of chromium and titanium, were performed on flight paths 6 and 7 at the 40 m flight station of ORELA. The experimental data were acquired using a pair of deuterated benzene detectors employing the now well-established pulse-height-weighting technique. These data were complemented by new total cross-section measurements where no useful previous data were available.
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P. E. Koehler,J. A. Harvey,F. Becvar,M. Krticka,K. H. Guber 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We describe new techniques for determining spins and parities of neutron resonances which have resulted in large improvements over previous methods. These advances have made it possible, for the first time, to obtain reduced-neutron- and total-radiation-width distributions separately for resonances of different spin and parity in odd-A target nuclides. Using these new as well as previous data, we show that neutron distributions sometimes are significantly different from the Porter-Thomas distribution assumed by the nuclear statistical model. Furthermore, we show that the radiation-width distributions often are substantially different than predicted by the nuclear statistical model using standard level densities and photon strength functions. These differences could have significant impact on astrophysical reaction rates calculated using the statistical model.
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김광수,S.E.Taylor,M.L.Gleason,K.J.Koehler 한국농림기상학회 2002 한국농림기상학회지 Vol.4 No.1
Sets of weather variables for estimation of LWD were evaluated using CART(Classification AndRegression Tree) models. Input variables were sets of hourly observations of air temperature at 0.3-m and1.5-m height, relative humidity(RH), and wind speed that were obtained from May to September in 1997,1998, and 1999 at 15 weather stations in Iowa, Illinois, and Nebraska, USA. A model that included airtemperature at 0.3-m height, RH, and wind speed showed the lowest misidentification rate for wetness.The model estimated presence or absence of wetness more accurately (85.5%) than the CART/SLD model(84.7%) proposed by Gleason et al. (1994). This slight improvement, however, was insufficient to justify theuse of our model, which requires additional measurements, in preference to the CART/SLD model. Thisstudy demonstrated that the use of measurements of temperature, humidity, and wind from automatedstations was sufficient to make LWD estimations of reasonable accuracy when the CART/SLD model wasused. Therefore, implementation of crop disease-warning systems may be facilitated by application of theCART/SLD model that inputs readily obtainable weather observations.
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Power Electronic Materials Research to Enable Next Generation GaN Power Switches
Charles R. “Chip” Eddy,N. Nepal,V.R. Anderson,C.R. English,N.Y. Garces,V.D. Wheeler,B.N. Feigelson,J.D. Greenlee,M.J. Tadjer,A.D. Koehler,T.J. Anderson,T.I. Feygelson,B.B. Pate,M.A. Mastro,F.J. Kub,K. 한국진공학회 2017 한국진공학회 학술발표회초록집 Vol.2017 No.8
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