http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Measurement of Dynamic Characteristics of an Inducer in Cavitating Conditions
Ashida, Takuya,Yamamoto, Keita,Yonezawa, Koichi,Horiguchi, Hironori,Kawata, Yutaka,Tsujimoto, Yoshinobu Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.3
In liquid-propellant rockets, POGO instability can occur, in which a fluctuation of propellant supply to the engine, a thrust fluctuation, and a structural vibration are coupled. For the prediction of this instability, it is required to provide dynamic characteristics of the pump represented as the transfer matrix correlating the upstream and downstream pressure and flow rate fluctuations. In the present study, the flow rate fluctuation is evaluated from the fluctuation of pressure difference at the different locations assuming that the fluctuation is caused by the inertia of the flow rate fluctuation. The experiments were performed in some flow conditions, and it was shown that the tendencies of dynamic characteristics are related to excitation frequencies, cavitation numbers and flow rate coefficients.
Ashida, Akemi,Ishizaka, Hiroki 서울대학교 교육연구소 2022 Asia Pacific Education Review Vol.23 No.4
Over the past decade, the Japanese government and Japanese universities have increased student mobility, both inbound and outbound, to accelerate the internationalization of higher education. However, student mobility was halted in early 2020 because of the COVID-19 pandemic, and international students who had planned to engage in a traditional study abroad program could not enter Japan. The current study examined whether the unexpected implementation of online distance classes because of the pandemic affected the learning strategies of graduate students, including international students. In addition, we investigated whether the online courses functioned as an alternative to face-to-face classes. An analysis using structural equation modeling revealed that the period of enrollment, self-regulation, and country of residence were factors that influenced help-seeking behavior. Graduate students who had enrolled before the pandemic and already experienced face-to-face classes were more likely to actively seek help from instructors and classmates in online classes. Furthermore, graduate students who were unable to enter the country but were taking classes online also tended to actively engage in help-seeking from their instructors and classmates. Students’ experiences of the sudden change to distance learning suggest that, to ensure a sustainable teaching and learning environment in various contexts, instructors should use class designs that consider distance learning, particularly designs that enhance students’ help-seeking, even under normal circumstances. In addition, ensuring sufficient online/virtual spaces for communication among teachers and students is important.
Ashida, Hisashi,Hong, Yeongjin,Murakami, Yoshiko,Shishioh, Nobue,Sugimoto, Nakaba,Kim, Youn Uck,Maeda, Yusuke,Kinoshita, Taroh American Society for Cell Biology 2005 Molecular biology of the cell Vol.16 No.3
<P>Within the endoplasmic reticulum (ER), mannoses and glucoses, donated from dolichol-phosphate-mannose and -glucose, are transferred to N-glycan and GPI-anchor precursors, and serine/threonine residues in many proteins. Glycosyltransferases that mediate these reactions are ER-resident multitransmembrane proteins with common characteristics, forming a superfamily of >10 enzymes. Here, we report an essential component of glycosylphosphatidylinositol-mannosyltransferase I (GPI-MT-I), which transfers the first of the four mannoses in the GPI-anchor precursors. We isolated a Chinese hamster ovary (CHO) cell mutant defective in GPI-MT-I but not its catalytic component PIG-M. The mutant gene, termed phosphatidylinositolglycan-class X (PIG-X), encoded a 252-amino acid ER-resident type I transmembrane protein with a large lumenal domain. PIG-X and PIG-M formed a complex, and PIG-M expression was <10% in the absence of PIG-X, indicating that PIG-X stabilizes PIG-M. We found that Saccharomyces cerevisiae Pbn1p/YCL052Cp, which was previously reported to be involved in autoprocessing of proproteinase B, is the functional homologue of PIG-X; Pbn1p is critical for Gpi14p/YJR013Wp function, the yeast homologue of PIG-M. This is the first report of an essential subcomponent of glycosyltransferases using dolichol-phosphate-monosaccharide.</P>
Measurement of Dynamic Characteristics of an Inducer in Cavitating Conditions
Takuya Ashida,Keita Yamamoto,Koichi Yonezawa,Hironori Horiguchi,Yutaka Kawata,Yoshinobu Tsujimoto 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.3
In liquid-propellant rockets, POGO instability can occur, in which a fluctuation of propellant supply to the engine, a thrust fluctuation, and a structural vibration are coupled. For the prediction of this instability, it is required to provide dynamic characteristics of the pump represented as the transfer matrix correlating the upstream and downstream pressure and flow rate fluctuations. In the present study, the flow rate fluctuation is evaluated from the fluctuation of pressure difference at the different locations assuming that the fluctuation is caused by the inertia of the flow rate fluctuation. The experiments were performed in some flow conditions, and it was shown that the tendencies of dynamic characteristics are related to excitation frequencies, cavitation numbers and flow rate coefficients.
Probability Distribution of an Image Dictionary for Compressed Sensing
Yuhei Ashida,Toshiaki Aida 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
Compressed sensing is one of the most effective signal processing methods through the sparse representation of inferred data, in which dictionary matrices play an essential role and they are learned by feature extraction methods such as K-SVD ones. Therefore, in general, it requires a considerable amount of computational cost to construct a dictionary matrix. In this paper, we analytically derive the expression of the probability distribution followed by an image dictionary for compressed sensing, assuming that grey scale images are generated by the Gaussian model. This result enables us to directly generate a dictionary matrix for images with no edge, and can be the first step to analytical performance evaluation of image processing by compressed sensing.
Hiroshi Ashida 한국유아교육학회 2002 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.8 No.2
There is probably no kindergarten without an athletic festival Undokai in Japan. Froebel, the father of kindergarten, wrote about Play Festivals that are quite similar to the athletic festivals of today. However, the Japanese athletic festival did not develop from Froebel‘s concept. Rather, they came out of the festival tradition in Japanese naval colleges and universities. These festivals, over time, filtered down to elementary education and then to kindergartens in Japan. Athletic festival is characterized by physical competition and group training and these characteristics philosophically are counter to the principles of kindergarten education, which focuses more on children‘s autonomy and spontaneity. The two reasons given for the common practice of the athletic festival are (1) that it encourages parents to participate and, (2) that both parents and children under-stand the entertaining value of sharing the joy of watching growing children. Although instruction on group behavior or observing rules tends to be teacher-centered, teachers today pay close attention to creating an atmosphere and exchanging ideas through discussion so that children can be actively and willingly involved. The potential problem is that the teachers‘ instructional abilities can divert their expectations away from the viewpoint of child-centeredness. Athletic festivals have become a necessity to kindergartens in Japan yet at the same time they continue to raise a potential problem for encouraging the development of individuality and the sense of individuals contributing and belonging to a group.