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Suzuki, Kunihiro,Tada, Yoko,Kataoka, Yuji,Nagayama, Tsutomu The Institute of Electronics and Information Engin 2009 Journal of semiconductor technology and science Vol.9 No.1
Monte Carlo simulation is widely used for predicting ion implantation profiles in amorphous targets. Here, we compared Monte Carlo simulation results with a vast database of ion implantation secondary ion mass spectrometry (SIMS), and showed that the Monte Carlo data sometimes deviated from the experimental data. We modified the electron stopping power model, calibrated its parameters, and reproduced most of the database. We also demonstrated that Monte Carlo simulation can accurately predict profiles in a low energy range of around 1keV once it is calibrated in the higher energy region.
BEGINNING OF SUPERCONDUCTING POWER ELECTRONICS DEVICES(S-PED)
Tsutomu Hoshino,Hnoshi Tsukiji,Masahiro Tsukiyanma,Itsuya Muta,Morio Suzuki 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The superconducting permanent current switch (PCS) is an important component to build MRI system. This switch uses a thermal and / or magnetic super-to-normal phase transition of the superconductor Unfortunately, it was not designed using with line frequency We made some superconducting power electronics devices operating up to 100 Hz. The results of development and preliminary studying of the heat controlled S-PED up to line frequency are presented. The circuit including these devices have to be designed as current source oriented.
Stress dependence on N/Ga ratio in GaN epitaxial films grownon ZnO substrates
Tsutomu Minegishi,Takuma Suzuki,Chihiro Harada,Hiroki Goto,Meoung-Whan Cho,Takafumi Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
GaN films were grown on ZnO substrate under various beam equivalent pressure ratios by plasma-assisted molecular beamepitaxy (P-MBE). We theoretically calculated the thermal stress caused by the dierence of thermal expansion coecients betweenGaN and ZnO. The changes of stress and critical thickness were evaluated by measurement of XRD for HT GaN and LT GaNbuer grown under Ga-rich and N-rich conditions. From this study, we observed that GaN grown under Ga-rich condition causesGaN lm to under compressive-stress, while GaN grown under N-rich condition was tensile-stressed. Consequently, interdiusionhas no eect on the variation of the critical thickness.
Kunihiro SUZUKI,Yoko TADA,Yuji KATAOKA,Tsutomu NAGAYAMA 대한전자공학회 2009 Journal of semiconductor technology and science Vol.9 No.1
Monte Carlo simulation is widely used for predicting ion implantation profiles in amorphous targets. Here, we compared Monte Carlo simulation results with a vast database of ion implantation secondary ion mass spectrometry (SIMS), and showed that the Monte Carlo data sometimes deviated from the experimental data. We modified the electron stopping power model, calibrated its parameters, and reproduced most of the database. We also demonstrated that Monte Carlo simulation can accurately predict profiles in a low energy range of around 1 keV once it is calibrated in the higher energy region.
Kunihiro SUZUKI,Yoko TADA,Yuji KATAOKA,Tsutomu NAGAYAMA 대한전자공학회 2009 Journal of semiconductor technology and science Vol.8 No.1
Monte Carlo simulation is widely used for predicting ion implantation profiles in amorphous targets. Here, we compared Monte Carlo simulation results with a vast database of ion implantation secondary ion mass spectrometry (SIMS), and showed that the Monte Carlo data sometimes deviated from the experimental data. We modified the electron stopping power model, calibrated its parameters, and reproduced most of the database. We also demonstrated that Monte Carlo simulation can accurately predict profiles in a low energy range of around 1 keV once it is calibrated in the higher energy region.
Tanaka, Tsutomu,Mulyadi, I Ketut,Moestikaningsih, Moestikaningsih,Oka, Tjok Gede,Soeripto, Soeripto,Triningsih, FX Ediati,Triyono, Teguh,Heriyanto, Didik Setyo,Hosono, Akihiro,Suzuki, Sadao,Tokudome, Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3
The incidence rate of stomach cancer in Bali, Indonesia, is estimated to be strikingly lower than that in Japan. We conducted an on-site ecological study to investigate the association between the stomach cancer incidence and Helicobacter pylori (H. pylori) infection. Recruiting 291 healthy persons (136 men and 155 women) from the general population in Bali, Indonesia, we conducted a urea breath test (UBT) to examine H. pylori infection, along with a pepsinogen test to detect chronic atrophic gastritis and urine analysis to estimate sodium and potassium excretion. UBT positivities were 9% (2-15, 95% confidence interval) for men and 7% (1-12) for women, and positive cases for H. pylori IgG antibodies were 1% (0-3) for men and 3% (0-5) for women, significantly lower than the respective values in Japan. Positive pepsinogen tests in Bali were 0% (0-0) for men and 1% (0-4) for women, also significantly lower than the Japanese figures. Computed values for daily salt excretion were $13.3{\pm}4.1g$ (mean${\pm}$SD) for men and $11.1{\pm}3.1g$ for women, as high as corresponding Japanese consumption values. Moreover, the estimated potassium excretion was $3.2{\pm}0.7g$ for men and $2.8{\pm}0.6g$ for women in Bali, significantly higher than the figures in Japan. There were no associations across genetic polymorphisms of IL-beta, TNF-alpha, and PTPN11 with UBT positivity. The low incidence of stomach cancer in Bali may thus mainly be due to the rare H. pylori infection. Namely, the bacterium infection seems to be a critical factor for gastric cancer rather than host or other environmental factors.
Relation between interdiffusion and polarity for MBE growth of GaN epilayers on ZnO substrates
Takuma Suzuki,Chihiro Harada,Hiroki Goto,Tsutomu Minegishi,Agus Setiawan,고항주,Meoung-Whan Cho,T.Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
We report on GaN growth on Zn-polar ZnO substrates using plasma-assisted molecular-beam epitaxy (P-MBE). Before GaNgrowth, ZnO substrate annealing conditions were optimized. Reection high-energy electron diraction (RHEED) patterns afterlow-temperature GaN buer layer annealing changed from streaky to spotty, suggesting that zinc and oxygen atoms interdiusefrom the ZnO substrate into the GaN epilayer. This interdiusion results in a mix-polar GaN epilayer.
Eiji Kondo,Tsutomu Tabata,Nao Suzuki,Daisuke Aoki,Hideaki Yahata,Yoshio Kotera,Osamu Tokuyama,Keiichi Fujiwara,Eizo Kimura,Fumitoshi Terauchi,Toshiyuki Sumi,Aikou Okamoto,Nobuo Yaegashi,Takayuki Enomo 대한부인종양학회 2020 Journal of Gynecologic Oncology Vol.31 No.6
Objective: In this study we sought to investigate the clinical factors that affect post progression survival (PPS) in patients with recurrent or persistent clear cell carcinoma (CCC). We utilized the JGOG3017/Gynecological Cancer InterGroup data to compare paclitaxel pluscarboplatin (TC) and irinotecan plus cisplatin (CPT-P) in the treatment of stages I to IV CCC. Methods: We enrolled 166 patients with recurrent or persistent CCC and assessed the impactof variables, including platinum sensitivity, treatment arm, crossover chemotherapy, primarystage, residual tumor at primary surgery, performance status, ethnicity, and tumor reductionsurgery at recurrence on the median of PPS in patients with recurrent or persistent CCC. Results: A total of 77 patients received TC, and 89 patients received CPT-P. The median PPSfor patients with platinum-resistant disease was 10.9 months, compared with 18.8 monthsfor patients with platinum-sensitive disease (hazard ratio [HR]=1.88; 95% confidence interval[CI]=1.30–2.72; log-rank p<0.001). In the multivariate analysis, the platinum sensitivity(resistant vs. sensitivity; HR=1.60; p=0.027) and primary stage (p=0.009) were identified asindependent predictors of prognosis factors for PPS in recurrent or persistent CCC. Conclusions: Our findings revealed that platinum sensitivity and primary stage are clinicalfactors that significantly affect PPS in patients with recurrent or persistent CCC as well as other histologic subtypes of ovarian cancer. PPS in patients with recurrent CCC shouldestablish the basis for future clinical trials in this population.