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Akashi Yoshimasa,Ogawa Koichi,Hisakura Katsuji,Enomoto Tsuyoshi,Ohara Yusuke,Owada Yohei,Hashimoto Shinji,Takahashi Kazuhiro,Shimomura Osamu,Doi Manami,Miyazaki Yoshihiro,Furuya Kinji,Moue Shoko,Oda T 대한위암학회 2022 Journal of gastric cancer Vol.22 No.3
Purpose Total or proximal gastrectomy of the upper-third early gastric cancer (u-EGC) often causes severe post-gastrectomy syndrome, suggesting that these procedures are extremely invasive for patients without pathologically positive lymph node (LN) metastasis. This study aimed to evaluate the clinical applicability of a stomach function-preserving surgery, local resection (LR), with prophylactic left gastric artery (LGA)-basin dissection (LGA-BD). Materials and Methods The data of patients with u-EGC (pathologically diagnosed as T1) were retrospectively analyzed. Total gastrectomy was performed in 30 patients, proximal gastrectomy in 45, and subtotal gastrectomy in 6; the LN status was evaluated assuming that the patients had already underwent LR + LGA-BD. This procedure was considered feasible in patients without LN metastases or in patients with cancer in the LGA basin. The reproducibility of the results was also evaluated using an external validation dataset. Results Of the 82 eligible patients, 79 (96.3%) were cured after undergoing LR + LGA-BD, 74 (90.2%) were pathologically negative for LN metastases, and 5 (6.1%) had LN metastases, but these findings were only observed in the LGA basin. Similarly, of the 406 eligible tumors in the validation dataset, 396 (97.5%) were potentially curative. Tumors in the lesser curvature, post-endoscopic resection status, and small tumors (<20 mm) were considered to be stronger indicators of LR + LGA-BD as all subpopulation cases met our feasibility criteria. Conclusions More than 95% of the patients with u-EGC might be eligible for LR + LGA-BD. This function-preserving procedure may contribute to the development of u-EGC without pathological LN metastases, especially for tumors located at the lesser curvature Purpose Total or proximal gastrectomy of the upper-third early gastric cancer (u-EGC) often causes severe post-gastrectomy syndrome, suggesting that these procedures are extremely invasive for patients without pathologically positive lymph node (LN) metastasis. This study aimed to evaluate the clinical applicability of a stomach function-preserving surgery, local resection (LR), with prophylactic left gastric artery (LGA)-basin dissection (LGA-BD). Materials and Methods The data of patients with u-EGC (pathologically diagnosed as T1) were retrospectively analyzed. Total gastrectomy was performed in 30 patients, proximal gastrectomy in 45, and subtotal gastrectomy in 6; the LN status was evaluated assuming that the patients had already underwent LR + LGA-BD. This procedure was considered feasible in patients without LN metastases or in patients with cancer in the LGA basin. The reproducibility of the results was also evaluated using an external validation dataset. Results Of the 82 eligible patients, 79 (96.3%) were cured after undergoing LR + LGA-BD, 74 (90.2%) were pathologically negative for LN metastases, and 5 (6.1%) had LN metastases, but these findings were only observed in the LGA basin. Similarly, of the 406 eligible tumors in the validation dataset, 396 (97.5%) were potentially curative. Tumors in the lesser curvature, post-endoscopic resection status, and small tumors (<20 mm) were considered to be stronger indicators of LR + LGA-BD as all subpopulation cases met our feasibility criteria. Conclusions More than 95% of the patients with u-EGC might be eligible for LR + LGA-BD. This function-preserving procedure may contribute to the development of u-EGC without pathological LN metastases, especially for tumors located at the lesser curvature
Good Scalability of Study of Spin Torque Transfer MRAMs with Perpendicular Magnetization MTJs
H. Yoda,T. Kishi,T. Nagase,M. Yoshikawa,E. Kitagawa,T. Daibou,K. Nishiyama,T. Kai,N. Shimomura,M. Nakayama,M. Amano,H. Aikawa,S. Takahashi,S. Ikegawa,M. Nagamine,J. Ozeki,S. Yuasa,Y. Nakatani,M. Oogan 한국자기학회 2008 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-
H. Yoda,Y. Ohsawa,Y. Kato,N. Shimomura,M. Shimizu,K. Koi,S. Shirotori,T. Inokuchi,H. Sugiyama,S. Oikawa,B. Altansargai,M. Ishikawa,A. Kurobe 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
We designed a voltage-control spintronics memory unit-cell, VoCSM, with high write-efficiency to prove a potential to reduce writing energy per bit. By optimizing a self-aligned structure, the cell has the critical switching current (Icsw) smaller than 50 μA at 20 nsec. for designed MTJ size of about 50 × 150 ㎚². The value is much smaller than that for mature STT-MRAM with the similar dimension. VoCSM also was proved to have unlimited endurance. Finally, with an empirical equation of Icsw further reduction of Icsw is estimated to clarify that VoCSM has a potential to reduce Icsw down to several μA.
Floating zone growth of calcium aluminate (Ca12Al14O33)
I. Tanaka,M. Yamanaka,J.K. Park,T. Shimomura,S. Watauchi,K. Kishio 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.2
Abundance of oxygen radicals residing in the cage-like lattice framework of calcium aluminate makes the growth of good quality single crystal difficult. Oxygen bubbles easily get trapped inside the crystal making the optical properties of the crystal inferior. In this study, we have investigated the behavior of oxygen bubbles inside the molten-zone during a conventional floating-zone growth. We have investigated the effect of different feed preparation process on the quality of the grown crystals and found that subsequent quenching of the feed from 900 °C after calcination at 1200 °C significantly reduces the bubbles in the crystal. Secondly we have performed floating-zone growth of C12A7 under a high magnetic field (up to 8T). We think that each of the bubbles become a small piece of magnet under the magnetic effect and repel each other in the molten zone. As a result we observed significant stabilization of the molten zone through early removal, and a reduction of accumulation of the bubbles.
M. Shimizu,Y. Ohsawa,H. Yoda,S. Shirotori,B. Altansargai,N. Shimomura,Y. Kato,S. Oikawa,H. Sugiyama,T. Inokuchi,K. Koi,M. Ishikawa,K. Ikegami,A. Kurobe Korean Magnetics Society 2018 Journal of Magnetics Vol.23 No.4
A voltage-control spintronics memory (VoCSM) which has a potential of low energy consumption uses the spin-Hall effect (SHE) and the voltage-controlled magnetic anisotropy (VCMA) effect for its write operation. In this work, the relationship between the critical switching current (Icsw) and the SHE electrode thickness (tN) is investigated in the range of 5 nm < tN < 8 nm. In the fabrication process, we develop highly-selective patterning process to stop MTJ etching precisely on the surface of the SHE electrode. Using the technique, Icsw is reduced by half as tN is varied from 8 nm to 5 nm, and Icsw of 112 mA at 20 ns write current pulse is obtained for MTJ size of 50 × 150 nm2 on Ta(2 nm)/TaB (3 nm) electrode. The results indicate that the decrease in the SHE electrode thickness is a promised method to reduce Icsw, which leads VoCSM to a low-energy-consumption device.