http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Hiroyuki Nakamura ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
During last two decades, nanoparticles have been intensively studied and developed rapidly for wide range of applications. Properties of nanoparticles are determined by their structure and morphology, and ideally, their optimization can realize the optimum properties for their application. However, it requires a lot of effort for it. The presenter attempts microreactors which can control chemical reaction conditions with a precise and prompt manner for this aim. Furthermore, adapting an on-line monitoring system can provide the information of product properties immediately. In this talk, some example of nanoparticle structure and morphology control of nanoparticles will be presented, and furthermore, combinatorial screening of reaction condition for CdSe nanoparticles will be discussed.
The Effects of MRI on Mouse Embryos During Fetal Stage
Nakamura, Takashi,Ryu, Myung-Sun,Sakazaki, Takahiko,Itokawa, Yuka,Maenaka, Toshihiro,Masubuchi, Takashi,Sekimoto, Hiroyuki,Kanehara, Masayuki,Kang, Young-Nam,Gu, Yeun-Hwa The Korean Association for Radiation Protection 2006 방사선방어학회지 Vol.31 No.2
The effects of Magnetic resonance imaging (MRI) on mouse embryos at the early stage of organogenesis were investigated. Pregnant ICR mice were exposed on day 8 of gestation to MRI at 0.5 T for 0.5 hour to 3 hours. The mortality rates of embryos or fetuses, the incidence of external malformations, fetal body weight and sex ratio were observed at day 18 of gestation. A significant increase in embryonic mortality was observed after exposure to either 0.5 T MRI for 0.5 hour or 2 hours. However, the exposure to MRI for 1 hour or 3 hours did not induce any significant increase in embryonic mortality when compared with control. External malformations such as exencephaly, cleft palate and anomalies of tail were observed in all experimental groups exposed to each MRI. A statistically significant increase of external malformations was observed in all groups treated with 0.5 T MRI for 0.5 hour and 3 hours. The incidence of external malformations in the mice group exposed to 0.5 T MRI for 0.5-hour was found to be higher than those of mice group exposed to 0.5 T MRI for 2 hours. The effects of MRI on the external malformations might not to be dose-dependent. There was no statistically significant difference in fetal body weight and sex ratio among each MRI exposure groups.
Shinji Takahashi,Hiroyuki Inose,Koji Tamai,Masayoshi Iwamae,Hidetomi Terai,Hiroaki Nakamura 대한척추신경외과학회 2023 Neurospine Vol.20 No.3
Osteoporotic vertebral fractures (OVFs) can hinder physical motor function, daily activities, and the quality of life in elderly patients when treated conservatively. Vertebral augmentation, which includes vertebroplasty and balloon kyphoplasty, is a commonly used procedure for OVFs. However, there have been reports of complications. Although serious complications are rare, there have been instances of adjacent vertebral fractures, cement dislocation, and insufficient pain relief due to cement failure, sometimes necessitating revision surgery. This narrative review discusses the common risks associated with vertebral augmentation for OVFs, such as cement leakage and adjacent vertebral fractures, and highlights the risk of revision surgery. The pooled incidence of revision surgery was 0.04 (0.02– 0.06). The risks for revision are reported as follows: female sex, advanced age, diabetes mellitus, cerebrovascular disease, dementia, blindness or low vision, hypertension, hyperlipidemia, split type fracture, large angular motion, and large endplate deficit. Various treatment strategies exist for OVFs, but they remain a subject of controversy. Current literature underscores the lack of substantial evidence to guide treatment strategies based on the risks of vertebral augmentation. In cases with a high risk of failure, other surgeries and conservative treatments should also be considered as treatment options.
The Effects of Speaking Activities on Brain Blood Flow: An NIRS Study
Junko Negishi,Hiroyuki Kanzaki,Yuko Yamada,Masumi Murakami,Erika Ozawa,Yoshiyuki Nakamura 범태평양 응용언어학회 2020 범태평양응용언어학회지 Vol.24 No.1
This study explored appropriate speaking activities for speakers of different proficiency levels by measuring the changes in their brain blood flow with near-infrared spectroscopy (NIRS). Fifty adult speakers and learners of English of various proficiency levels participated in the study by undertaking four types of task: a single-speaker picture description, interview, and two paired interaction activities on an easy and a difficult topic. By objectively analyzing the collected data, the authors revealed which speaking activity facilitated brain activity, which speaking activity was suitable for which level of learner, and from which area of the brain it was possible to obtain activation data. In short, advanced language learners need to tackle more difficult tasks, while easy, patterned tasks such as the picture description and interview are more appropriate for elementary level learners. As for intermediate learners, their language learning is likely to be promoted through most of the activity types, except for the interactions on difficult topics, which were shown to decrease their brain blood flow.