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Fukushima, H.,Toratani, M.,Saitoh, S. 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
The study first reports the ship-measured normalized water-leaving radiance observed over coccolithophore waters in Bering Sea in late July, 2000. A contemporaneous SeaWiFS image is chosen to compare the satellite-derived water-leaving radiance with that of ship-measurements. Since the exact ship locations were covered by cloud, pixels in surrounding area are sampled for comparison, showing factor 2-3 difference from the ship measured value. The difference may be explained by the 3-day time difference between the satellite and the ship observations. The paper also demonstrates OUTS and SeaWiFS images of high reflectance waters in the area observed in 1997 and 1998.
Performance Evaluation of an Anode-supported Honeycomb Solid Oxide Fuel Cell
Fukushima, Akira,Nakajima, Hironori,Kitahara, Tatsumi The Electrochemical Society 2013 ECS transactions Vol.50 No.48
<P>An anode-supported honeycomb SOFC that can achieve high power density and enhanced durability was developed. Electrolyte layer of 8YSZ (8 mol% yittria stabilized zirconia) is employed by dip-coating an anode honeycomb substrate of Ni/YSZ, followed by being coated with cathode layer of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>. Current-voltage and current-power density characteristics of the cells having different anode and cathode flow channel configurations at 850 were measured. The results show promising performances of the cell as a starting point to develop stacks composed of multiple honeycomb cells.</P>
Fukushima, H.,Schmidt, M.,Sohn, B. J.,Toratani, M.,Uno, I. 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
The paper first proposes an empirical algorithm for detecting dust-loaded airmass observed by Sea Wide Field-of-view Scanner (SeaWiFS). The proposed dust index formula is based on the curvature of the spectral reflectance estimated from the SeaWiFS band 4 (510 nm band) through band 8 (865 nm band) data, assuming $quot;clear ocean water$quot; reflectance. Evaluation of the algorithm is made over several typical Asian dust images including the ones over the Pacific in April, 1998, when a major dust event was reported. The study analyzes the performance and the characteristics of the algorithm by comparing the satellite-derived dust index images with contemporaneous columnar concentration of dust particles predicted by a numerical dust transport model. The comparison reveals several small-scale differences although their dust distribution patterns show good agreement generally.
Evaluation of OCTS atmospheric correction and possible improvement
Fukushima, Hajime,Noguchi, Toshimitsu,Tabata, Hidekazu,Toratani, Mitsuhiro 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
The paper first describes the standard atmospheric correction algorithm for OCTS visible band data used for the product generation at NASDA/EOC. The algorithm is similar to that of SeaWiFS and uses 10 aerosol models including $quot;Asian dust model$quot; which is introduced in consideration to the feature of aerosols over the east Asian waters. In order to estimate the aerosol reflectances in shorter wavelength region, the algorithm selects an appropriate pair of aerosol models among the candidate models and determines the interpolation ratio between the aerosol reflectances given by the models in use of the averaged value of spectral ratio (called $quot;Υ$quot;) of estimated aerosol optical thickness in 670 nm and 865 nm bands for each model. Performance of the algorithm are discussed in comparison with the CZCS algorithm The paper then discusses the scheme determining the average value of Υ and proposes two modified schemes for averaging. To evaluate the estimation error in predicting the aerosol reflectance, simulations are conducted. The results show that the estimation error of the reflectance at 443 nm is decreased by about 18 to 58 % on the average.
Fukushima, Hajime,Mitomi, Yasushi,Otake, Takashi,Toratani, Mitsuhiro 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
The paper first describes the atmospheric correction algorithm for the Ocean Color and Temperature Scanner (OCTS) visible band data used at Earth Observation Center (EOC) of National Space Development Agency of Japan (NASDA). It uses 10 candidate aerosol models including $quot;Asian dust model$quot; introduced in consideration of the unique feature of aerosols over the east Asian waters. Based on the observations at 670 and 865 nm bands where the reflectance of the water body can be discarded, the algorithm selects a pair of aerosol models that accounts best for the observed spectral reflectances to synthesize the aerosol reflectance in other bands. The paper also evaluates the performance of the algorithm by comparing the satellite estimates of water-leaving radiance and chlorophyll-a concentration with selected buoy- and ship-measured data. In comparison with the old CZCS-type atmospheric correction algorithm where the aerosol reflectance is assumed to be spectrally independent, the OCTS algorithm records factor 2-3 less error in estimating the normalized water-leaving radiances. In terms of chlorophyll-a concentration estimation, however, the accuracy stays very similar compared to that of the CZCS-type algorithm. This is considered to be due to the nature of in-water algorithm which relies on spectral ratio of water-leaving radiances.