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Landsat-TM의 밴드비 연산데이터를 이용한 토지피복분류에 관한 연구
권봉겸,山田淳,仁連孝紹,조명희 한국지리정보학회 2003 한국지리정보학회지 Vol.6 No.2
본 연구에서는 밴드간 연산데이터를 재사용하는 방법이 위성영상을 이용한 토지피복 분류시의 정확도를 향상시키는 방법으로 제안되고 검증되었다. 분류항목별로 연산에 사용할 밴드를 결정하기 위해 밴드 6을 제외한 6개의 밴드를 조합이 가능한 수로 조합하고 감독분류의 최대우도법으로 토지피복 분류를 실시하였다. 49가지로 조합된 밴드의 토지피복 분류결과에서, 정확도가 상위 10위내에 분류된 밴드조합에서 사용된 횟수가 많은 두 밴드를 선정하고 연산하였다. 여기서 얻어진 연산결과를 재구성하여 다시 토지피복 분류를 실시하였다. 그리고 원 데이터를 사용한 토지피복 분류결과와 비교, 검토하였다. 연산 결과를 재구성한 데이터와 원 데이터를 사용한 토지피복 분류를 비교?검토한 결과, 연산결과를 재구성하여 사용한 토지피복 분류에서 나지에 대한 정확도가 조금 떨어진 반면 전체적으로 정확도가 향상됨을 알 수 있었다. 특히 인공지물에 대한 정확도가 향상되었기 때문에 이후 도시역에 대한 토지피복 분류 및 지표정보를 분석할 때 밴드간 연산데이터를 재사용하는 방법이 유용할 것으로 판단된다. In this research, re-using band ratio data was proposed and examined as a method of raising the accuracy in landcover classification which is using satellite data. In order to determine the band which is used to calculation in the classified item, the six bands except the band 6 were combined with the band in which combinatin is possible and the landcover classification by MLC of supervised classification was carried out. In the result of landcover classification which is combined with forty nine combination. T재 bands which were mostly used by band combination in the accuracy bilonged inside the 10th place of a higher rank were selected and also calculated. landcover classification were performed again after the calulation result had recombinated from the research. In addtition, the landcover classification result was compared and examined with the landcover classification using the old data. From the result of which was compared and examined the new landcover classification data recombinated calulation result with landcover classification using original data, The classification accuracy of the new landcover classification data recombinated calculation result became low in ground but became improved in the all class. Specially The accuracy to urban area is very improved. therefore, it determined that reusing band data is very useful when we need to analyze landcover classification and land information to urban area after that.
Hachikubo, Akihiro,Yamada, Koutarou,Miura, Taku,Hyakutake, Kinji,Abe, Kiyoshi,Shoji, Hitoshi Korea Institute of Ocean ScienceTechnology 2004 Ocean and Polar Research Vol.26 No.3
The processes of formation and dissociation of gas hydrates were investigated by monitoring pressure and temperature variations in a pressure cell in order to understand the kinetic behavior of gas hydrate and the controlling factors fur the phase transition of gas hydrate below freezing. Gas hydrates were made kom guest gases ($CH_4,\;CO_2$, and their mixed-gas) and fine ice powder. We found that formation and dissociation speeds of gas hydrates were not controlled by temperature and pressure conditions alone. The results of this study suggested that pressure levels at the formation of mixed-gas hydrate determine the transient equilibrium pressure itself.
Komatsu, Seiji,Yamada, Kiyoshi,Yamashita, Shuji,Sugiyama, Narushi,Tokuyama, Eijiro,Matsumoto, Kumiko,Takara, Ayumi,Kimata, Yoshihiro Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.3
Background We established the Microvascular Research Center Training Program (MRCP) to help trainee surgeons acquire and develop microsurgical skills. Medical students were recruited to undergo the MRCP to assess the effectiveness of the MRCP for trainee surgeons. Methods Twenty-two medical students with no prior microsurgical experience, who completed the course from 2005 to 2012, were included. The MRCP comprises 5 stages of training, each with specific passing requirements. Stages 1 and 2 involve anastomosing silicone tubes and blood vessels of chicken carcasses, respectively, within 20 minutes. Stage 3 involves anastomosing the femoral artery and vein of live rats with a 1-day patency rate of >80%. Stage 4 requires replantation of free superficial inferior epigastric artery flaps in rats with a 7-day success rate of >80%. Stage 5 involves successful completion of one case of rat replantation/transplantation. We calculated the passing rate for each stage and recorded the number of anastomoses required to pass stages 3 and 4. Results The passing rates were 100% (22/22) for stages 1 and 2, 86.4% (19/22) for stage 3, 59.1% (13/22) for stage 4, and 55.0% (11/20) for stage 5. The number of anastomoses performed was $17.2{\pm}12.2$ in stage 3 and $11.3{\pm}8.1$ in stage 4. Conclusions Majority of the medical students who undertook the MRCP acquired basic microsurgical skills. Thus, we conclude that the MRCP is an effective microsurgery training program for trainee surgeons.
Umirov, Nurzhan,Yamada, Yuto,Munakata, Hirokazu,Kim, Sung-Soo,Kanamura, Kiyoshi Elsevier 2019 Journal of Electroanalytical Chemistry Vol.855 No.-
<P><B>Abstract</B></P> <P>Attractive electrochemical properties of Li<SUB>4</SUB>Ti<SUB>5</SUB>O<SUB>12</SUB> (LTO) as an anode material for lithium-ion batteries originate primarily from the lithium-ion diffusion behavior in the crystal lattice. Therefore, it is extremely important to understand the inherent material properties that are favorable for superior kinetic performance. Here we report on the intrinsic electrochemical properties of LTO without the influence of inactive electrode components (e.g., binder, conductive agent) using single-particle measurement technique. Electrochemical analysis revealed an exceptionally high rate capability of a single LTO particle compared to the conventional LTO-based electrode. In particular, a single LTO particle demonstrates capacity retention of 88% even at 440 C-rate, while conventional LTO-based electrode shows a two-fold decrease in capacity at 30 C-rate, though it is temperature dependent. Particular attention is paid to determine the correlation of phase transition behavior in a single LTO particle with activation energies of exchange current (<I>i</I> <SUB> <I>o</I> </SUB>), charge transfer resistance (<I>R</I> <SUB> <I>ct</I> </SUB>) at the electrode/electrolyte interface, and diffusivity (<I>D</I>) of lithium-ion in the lattice obtained by single-particle measurement technique.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The intrinsic properties of LTO were investigated by single particle measurement. </LI> <LI> Single LTO particle shows outstanding rate capability vs. composite LTO electrode. </LI> <LI> Activation energies of <I>i</I> <SUB> <I>o</I> </SUB>, <I>R</I> <SUB> <I>ct</I> </SUB>, and <I>D</I> evaluated in the range of −10 °C–80 °C. </LI> <LI> LTO reaction is single-phase rather than two-phase at certain temperatures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Seiji Komatsu,Kiyoshi Yamada,Shuji Yamashita,Narushi Sugiyama,Eijiro Tokuyama,Kumiko Matsumoto1,Ayumi Takara,Yoshihiro Kimata 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.3
Background We established the Microvascular Research Center Training Program (MRCP)to help trainee surgeons acquire and develop microsurgical skills. Medical students were recruited to undergo the MRCP to assess the effectiveness of the MRCP for trainee surgeons. Methods Twenty-two medical students with no prior microsurgical experience, who completed the course from 2005 to 2012, were included. The MRCP comprises 5 stages of training,each with specific passing requirements. Stages 1 and 2 involve anastomosing silicone tubes and blood vessels of chicken carcasses, respectively, within 20 minutes. Stage 3 involves anastomosing the femoral artery and vein of live rats with a 1-day patency rate of >80%. Stage 4 requires replantation of free superficial inferior epigastric artery flaps in rats with a 7-day success rate of >80%. Stage 5 involves successful completion of one case of rat replantation/transplantation. We calculated the passing rate for each stage and recorded the number of anastomoses required to pass stages 3 and 4. Results The passing rates were 100% (22/22) for stages 1 and 2, 86.4% (19/22) for stage 3, 59.1% (13/22) for stage 4, and 55.0% (11/20) for stage 5. The number of anastomoses performed was 17.2±12.2 in stage 3 and 11.3±8.1 in stage 4. Conclusions Majority of the medical students who undertook the MRCP acquired basic microsurgical skills. Thus, we conclude that the MRCP is an effective microsurgery training program for trainee surgeons.
Akihiro Hachikubo,Koutarou Yamada,Taku Miura,Kinji Hyakutake,Kiyoshi Abe,Hitoshi Shoji 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.3
The processes of formation and dissociation of gas hydrates were investigated by monitoring pressure and temperature variations in a pressure cell in order to understand the kinetic behavior of gas hydrate and the controlling factors for the phase transition of gas hydrate below freezing. Gas hydrates were made from guest gases (CH4, CO2 and their mixed-gas) and fine ice powder. We found that formation and dissociation speeds of gas hydrates were not controlled by temperature and pressure conditions alone. The results of this study suggested that pressure levels at the formation of mixed-gas hydrate determine the transient equilibrium pressure itself.
Masaya Akase,Hiroaki Yamada,Toshihiko Tanaka,Ryo Okawachi,Kiyoshi Ochi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a simple current-ripple calculation on the source side of the LCL filter for three-phase pulse width modulated (PWM) rectifiers and the parallel-connected PWM rectifiers. Per-phase-base equivalent-circuits of the LCL filter for PWM rectifiers and parallel-connected three-phase PWM rectifiers are derived theoretically. The transfer function between the output voltages of three-phase PWM rectifiers and parallel-connected three-phase PWM rectifiers and the sourceside ripple currents is derived using the superposition principle, and then Bode plots are drawn. Then, the amplitude ratio of source-side harmonic currents to the output voltages of threephase PWM rectifiers and the parallel-connected three-phase PWM rectifiers is easily calculated from the Bode plots. A digital computer simulation is implemented to confirm the validity and high practicability of the proposed current-ripple calculation of LCL filter using PSIM software. Simulation results demonstrate that the current-ripple calculated with the Bode plots agrees well with the simulation results. It is, therefore, concluded that the proposed current-ripple calculation of the LCL filter is useful for three-phase PWM rectifiers and parallel-connected three-phase PWM rectifiers.