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New PCBN for Heavy Interrupted Cutting of Hardened Steel
Okamura Katsumi,Kukino Satoru,Fukaya Tomohiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
PCBN tools are used worldwide for machining of hardened steel parts in automotive industries. But in heavy interrupted cutting of hardened steel, the tool life is not so stable by sudden breakage of the cutting edge, and total cost of cutting by PCBN is not so economical compared to the grinding. To solve this problem, new PCBN has been developed. New PCBN has very fine and homogeneous microstructure to increase the toughness of sintered body that it provides a reliable tool life for heavy interrupted cutting.
Study for grain-filling of rice using 13C labeling flow-metabolome analysis
Okamura Masaki,Hirai Masami Yokota,Sawada Yuji,Okamoto Mami,Arai-Sanoh Yumiko,Yoshida Hiroe,Mukouyama Takehiro,Adachi Shunsuke,Fushimi Erina,Yabe Shiori,Nakagawa Hiroshi,Kobayashi Nobuya,Kondo Motohik 한국작물학회 2017 한국작물학회 학술발표대회 논문집 Vol.2017 No.-
WIDE-FIELD IMAGING WITH MOSAIC CCD CAMERAS
OKAMURA S.,DOI M.,KAWASAKI W.,KOMIYAMA Y.,SHIMASAKU K.,YAGI M.,YASUDA N.,KASHIKAWA N.,SEKIGUCHI M. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
An outline is given of our development of mosaic CCD cameras. Hardware and data reduction software of two operational cameras are described. Scientific objectives of wide-field imaging with the cameras are briefly described.
Okamura, Takehiko,Ando, Ryosuke,Akita, Hidetoshi,Hashimoto, Yoshihiro,Iwase, Yutaka,Naiki, Taku,Kawai, Noriyasu,Tozawa, Keiichi,Kohri, Kenjiro Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9
Objective: The guidelines on indications for prophylactic use of Bacille Calmette-Gu$\acute{e}$rin (BCG) against non-muscle-invasive bladder cancer (NMIBC) have changed over the years. In order to assess the impact on outcome, the present retrospective comparison of BCG efficacy by time period with Japanese patients was conducted. Patients and Methods: A total of 146 cases of NMIBC treated with BCG since February 1985 were retrospectively evaluated. All patients received 80 mg of BCG (Tokyo 172 strain) six to eight times a week for prophylactic use. Comparison was made among three historical groups (Group A: 1980's, 39 cases; Group B: 1990's, 61 cases; Group C: 2000's, 46 cases). Results: In total, recurrence was seen in 55 of the 146 cases (37.7%), and progression in 14 (9.6%), 1 patient dying of cancer. These overall results were similar to those outlined in previous reports. However, the outcomes of this time-period-based analysis indicated a tendency for a shorter time to recurrence in patients after 2000, although a log-rank test showed no significance (P=0.229). Seven of the cases featuring progression (i.e., half of all such cases) were among the 46 Group C patients (15.2%). Excluding these progressive cases, there was no significant difference among the remaining 132 patients in the three groups. Conclusion: This study results revealed a tendency for a lower non-recurrence rate after 2000 in our series. This could stem from a number of factors, including changes in BCG indication criteria and the evolution of histopathological diagnostic criteria.
Kouichi Okamura,Takuya Kikuchi,Aya Murata,이인형,Haruo Yamada,Hisashi Inokuma,Naoki Sasaki 대한수의학회 2009 JOURNAL OF VETERINARY SCIENCE Vol.10 No.2
The purpose of the present study was to evaluate the prokinetic effects of mosapride with non-invasive assessment of myoelectrical activity in the small intestine and caecum of healthy horses after jejunocaecostomy. Six horses underwent celiotomy and jejunocaecostomy, and were treated with mosapride (treated group) at 1.5 mg/kg per osos once daily for 5 days after surgery. The other six horses did not receive treatment and were used as controls (non-treated group). The electrointestinography (EIG) maximum amplitude was used to measure intestinal motility. Motility significantly decreased following surgery. In the treated group, the EIG maximum amplitude of the small intestine was significantly higher than in the controls from day 6∼31 after treatment. These findings clearly indicate that mosapride could overcome the decline of intestinal motility after jejunocaecostomy in normal horses.
Accuracy of Endoscopic Diagnosis for Mild Atrophic Gastritis Infected with Helicobacter pylori
Takuma Okamura,Yugo Iwaya,Kei Kitahara,Tomoaki Suga,Eiji Tanaka 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.4
Background/Aims: This study examined the accuracy of endoscopic evaluation for determining the Helicobacter pylori infection statusin patients with mild atrophy who might not exhibit characteristic endoscopic findings. Methods: Forty endoscopists determined the H. pylori infection status of 50 randomly presented H. pylori-positive and H. pylorinegativecases on the basis of a list of established findings. Results: The median clinical endoscopy experience was 7 years (range, 1–35 years), including 22 board-certified endoscopists (55%) of theJapan Gastroenterological Endoscopy Society. The mean accuracy rate of endoscopic diagnosis was 67% and was unrelated to experiencestatus (experienced vs. trainee: 69% vs. 65%, p=0.089) and total years of experience (R2=0.022). The most frequently selected endoscopicfindings were regular arrangement of collecting venules (59%), atrophy (45%), and red streak (22%), which had fair accuracy rates of67%, 65%, and 73%, respectively. By contrast, the accuracy rates of nodularity (89%) and mucosal swelling (77%) were highest. The 20endoscopists who more frequently identified these findings diagnosed H. pylori infection significantly more accurately than did the otherendoscopists (71% vs. 64%, p=0.008). Conclusions: Careful attention to nodularity and mucosal swelling in patients with mild atrophy may enhance diagnosis, enable prompttreatment, and avoid possible long-term carcinogenesis.
Building Connections to Protect Ethnic Education: The Chōsen Schools’ Intercultural Network
( Ryoko Okamura ),( Hosok O ) 서울대학교 규장각한국학연구원 2023 Seoul journal of Korean studies Vol.36 No.1
Prompted by the desire to return to their homeland and reclaim their ethnic identity after the end of Japan’s colonial rule, Zainichi Koreans taught their children the Korean language and educated them about their cultural heritage at what later became known as Chōsen schools. While neither the Japanese nor the South Korean government supported the Chōsen schools, the North Korean government provided them with financial support through an organization called Chongryun. Despite enduring suppression and discriminatory treatment by the Japanese government, Chōsen schools have managed to survive, becoming the largest foreign school system in Japan. This article examines the impact of activism by the Chōsen school community in protecting ethnic education and promoting intercultural engagement between Zainichi Koreans, Japanese, and foreign school communities. Focusing on three key events, the article examines efforts by the Chōsen school community to resolve bias and misunderstanding among members of the Japanese public concerning the ethnic education they provide. It argues that Zainichi Koreans’ grassroots activities have helped to build intercultural connections with local communities and other foreign schools in Japan.