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Lee Janie M.,Ichikawa Laura E.,Wernli Karen J.,Bowles Erin J. A.,Specht Jennifer M.,Kerlikowske Karla,Miglioretti Diana L.,Lowry Kathryn P.,Tosteson Anna N. A.,Stout Natasha K.,Houssami Nehmat,Onega T 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.8
Objective: When multiple surveillance mammograms are performed within an annual interval, the current guidance for oneyear follow-up to determine breast cancer status results in shared follow-up periods in which a single breast cancer diagnosis can be attributed to multiple preceding examinations, posing a challenge for standardized performance assessment. We assessed the impact of using follow-up periods that eliminate the artifactual inflation of second breast cancer diagnoses. Materials and Methods: We evaluated surveillance mammograms from 2007–2016 in women with treated breast cancer linked with tumor registry and pathology outcomes. Second breast cancers included ductal carcinoma in situ or invasive breast cancer diagnosed during one-year follow-up. The cancer detection rate, interval cancer rate, sensitivity, and specificity were compared using different follow-up periods: standard one-year follow-up per the American College of Radiology versus follow-up that was shortened at the next surveillance mammogram if less than one year (truncated follow-up). Performance measures were calculated overall and by indication (screening, evaluation for breast problem, and short interval follow-up). Results: Of 117971 surveillance mammograms, 20% (n = 23533) were followed by another surveillance mammogram within one year. Standard follow-up identified 1597 mammograms that were associated with second breast cancers. With truncated follow-up, the breast cancer status of 179 mammograms (11.2%) was revised, resulting in 1418 mammograms associated with unique second breast cancers. The interval cancer rate decreased with truncated versus standard follow-up (3.6 versus 4.9 per 1000 mammograms, respectively), with a difference (95% confidence interval [CI]) of -1.3 (-1.6, -1.1). The overall sensitivity increased to 70.4% from 63.7%, for the truncated versus standard follow-up, with a difference (95% CI) of 6.6% (5.6%, 7.7%). The specificity remained stable at 98.1%. Conclusion: Truncated follow-up, if less than one year to the next surveillance mammogram, enabled second breast cancers to be associated with a single preceding mammogram and resulted in more accurate estimates of diagnostic performance for national benchmarks.
MULTIFUNCTIONAL POWER LINE COMPENSATOR FOR DISTRIBUTION POWER LINES
M.Ichihara,T Akiyama,H.Nara,K.Tamura,F.Ichikawa 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
We propose a multifunctional power line compensator (PLC) which can individually compensate multiple impediments at the same time The PLC has the flexibility to share power to each compensation according to commands, this improving the working rate We constructed a 100 kVA PLC model including a controller with digital signal processor (DSP) to realize a multifunctional compensation The PLC was connected to a power receiving facility, and experimental results of multifunctional compensation were obtained.
Nakayama, S.,Mauger, C.,Ahn, M.H.,Aoki, S.,Ashie, Y.,Bhang, H.,Boyd, S.,Casper, D.,Choi, J.H.,Fukuda, S.,Fukuda, Y.,Gran, R.,Hara, T.,Hasegawa, M.,Hasegawa, T.,Hayashi, K.,Hayato, Y.,Hill, J.,Ichikawa Elsevier 2005 Physics letters: B Vol.619 No.3
<P><B>Abstract</B></P><P>Neutral current single <SUP>π0</SUP> production induced by neutrinos with a mean energy of 1.3 GeV is measured using a 1000 ton water Cherenkov detector in the K2K long baseline neutrino experiment. The cross section for this process relative to the total charged current cross section is measured to be 0.064±0.001(stat.)±0.007(sys.). The momentum distribution of neutral current <SUP>π0</SUP>s from a water target is measured with high statistics for the first time.</P>
박세라 ( S. R. Park ),송요순 ( Y. S. Song ),( M. Ichikawa ) 한국공업화학회 1993 한국공업화학회 연구논문 초록집 Vol.1993 No.0
The reduction of carbon dioxide by toluene was carried out at 500-600°C over Pd/γ-Al<sub>2</sub>O<sub>3</sub>, Pd-Me/γ- Al<sub>2</sub>O<sub>3</sub>, Ni/SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>, and W/SiO<sub>2</sub>- Al<sub>2</sub>O<sub>3</sub> catalysts. Palladium-cerium co-supported catalysts show good activity for formation of carbon monoxide and benzene. The activity for production of carbon monoxide and benzene on palladium-promoter catalysts was in order of Pd-Ce, Pd-La, Pd-Ca, Pd-Cr, Pd-Zr, Pd-Pb, Pd-Tl. Nickel catalyst showed high actvity is good for selectivity to carbon monoxide. Tungsten catalyst was stable to form benzene, but very low conversion. Most catalysts are showed deactivation with reaction period, but in case of Pd-Ce/Alumina catalyst the deactivation to form of both carbon monoxide and benzene was smaller than the other catalysts.
Optical Properties of aerosol particles over the Western Pacific Ocean
Miura, K.,Nakae, S.,Otagiri, K. Aoki,S.,Ichikawa, M. 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
In order to study the optical properties of aerosols over the ocean, solar radiation has been measured with a portable sunphotometer on board by the R/V Hakuho Maru. The portable sunphotometer (MS-120(S); Eko Co.) is convenient for measuring direct solar radiation on board, because it is light (1.5kg) and has a peak hold circuit. Mainly results are as follows: (1) The time variation of the calibration constant showed that we were able to measure an optical thickness in accuracy of 0.03 with the portable sunphotometer by calibrating it twice a year. (2) The time variation of the aerosol optical thickness over the Western Pacific Ocean confirmed that the effect of the Mt. Pinatubo enuptions had disappeared in the end of 1994.