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Akiko Fukuda 범태평양 응용언어학회 2019 범태평양응용언어학회지 Vol.23 No.1
This paper aims to explore the characteristics of self-regulated learning from information gained in post-questionnaire interviews, with special emphasis on the differences between low-proficiency learners and high-proficiency learners. Self-regulated learning is a cyclical process to metacognitively, motivationally, and behaviorally boost learning performance (Zimmerman & Schunk, 2001). Fukuda (2018a) quantitatively revealed the motivational and cognitive differences of self-regulated learning skills between the low- and high-proficiency groups, showing that self-regulated learning significantly influenced language learning achievement, which is consistent with most other studies. However, those have not addressed less-proficient learners enough to understand how they perceive self-regulated learning. Seven low-proficiency learners and ten high-proficiency learners participated and were selected based on a questionnaire regarding self-regulated language learning. The researcher adapted semi-structured interviews based on the factors in the Motivated Strategies for Learning Questionnaire (MSLQ). The results showed the obvious characteristics that the less-proficient learners possessed. Interviews consistently revealed that the less-proficient learners had a peculiar self-regulated learning attitude that was different from the more-proficient learners. Because the less-proficient learners strongly emphasized the outcome of the exams or performance compared to others, they tended to rarely feel successful in their English education experience, which seemed to cause them to give up learning English and make them reluctant to ask teachers for help. These tendencies demonstrated the importance of teacher encouragement of learner motivational satisfaction and the promotion of the use of various metacognitive strategies.
(Hiroshi Fukuda),(Atsushi Wada) 한국복합재료학회 2002 Composites research Vol.15 No.1
N/A This paper reviews research activities of some mechanical test methods for advanced composites which have been conducted in Fukuda laboratory, Tokyo University of Science. The subjects are (1) innovation and development of compression bending test, (2) mechanical-property evaluation of soft-core sandwich beam, and (3) loop test to measure the strength of monofilaments. In the present paper, three subjects related to mechanical test method were reviewed. They are (1) innovation and development of compression bending test, (2) mechanical-property evaluation of soft-core sandwich beam, and (3) loop test to measure the strength of monofilamens and the followings are the summary. (1) Compression bending test and eccentric compression bending test was successfully applied to flat coupons and pipes made of CFRP. (2) Mechanical properties of CFRP/formed core sandwich beams were evaluated. Notable finding is that the shearing modulus of core strongly depends on the specimen configuration. (3) A loop test was tried to measure the strength of monofilaments used for advanced composites. Correlation between tensile test and loop test was also tried.
Fukuda, Takehito,Kosaka, Tatsuro,Osaka, Katsuhiko The Korean Society for Composite Materials 2001 Composites research Vol.14 No.6
This paper describes applications of cure monitoring techniques by using embedded fiber optic strain sensors, which are extrinsic Fabry-Perot interoferometric (EFPI) and/or fiber Bra99 grating (FBG) sensors, to three kinds of molding methods of autoclave, FW and RTM molding methods. In these applications, internal strain of high-temperature curing resin was monitored by EFPI sensors. From theme experimental results, it was shown that strain caused by thermal shrink at cooling stage could be measured well. In addition, several specific matters to these molding methods were considered. As thor an autoclave molding of unidirectional FRP laminates, it was confirmed that off-axis strain of unidirectional FRP could be monitored by EFPI sensors. As for FW molding using room-temperature (RT) cured resin, it was found that the strain outputs from EFPI sensors represented curing shrinkage as well as thermal strain and the convergence meant finish of cure reaction. It was also shown that this curing shrinkage should be evaluated with consideration on logarithmic change in stiffness of matrix resin. As for a RTM melding, both EFPI and FBC sensors were employed to measure strain. The results showed that FBG sensors hale also good potential for strain monitoring at cooling stage, while the non-uniform thermal residual strain of textile affected the FBG spectrum after molding. This study has proven that embedded fiber optic strain sensors hale practical ability of cure monitoring of FRP. However, development of automatic installation methods of sensors remains as a problem to be solved for applications to practical products.
Mechanisms and Physiological Roles of Mitophagy in Yeast
Fukuda, Tomoyuki,Kanki, Tomotake Korean Society for Molecular and Cellular Biology 2018 Molecules and cells Vol.41 No.1
Mitochondria are responsible for supplying of most of the cell's energy via oxidative phosphorylation. However, mitochondria also can be deleterious for a cell because they are the primary source of reactive oxygen species, which are generated as a byproduct of respiration. Accumulation of mitochondrial and cellular oxidative damage leads to diverse pathologies. Thus, it is important to maintain a population of healthy and functional mitochondria for normal cellular metabolism. Eukaryotes have developed defense mechanisms to cope with aberrant mitochondria. Mitochondria autophagy (known as mitophagy) is thought to be one such process that selectively sequesters dysfunctional or excess mitochondria within double-membrane autophagosomes and carries them into lysosomes/vacuoles for degradation. The power of genetics and conservation of fundamental cellular processes among eukaryotes make yeast an excellent model for understanding the general mechanisms, regulation, and function of mitophagy. In budding yeast, a mitochondrial surface protein, Atg32, serves as a mitochondrial receptor for selective autophagy that interacts with Atg11, an adaptor protein for selective types of autophagy, and Atg8, a ubiquitin-like protein localized to the isolation membrane. Atg32 is regulated transcriptionally and post-translationally to control mitophagy. Moreover, because Atg32 is a mitophagy-specific protein, analysis of its deficient mutant enables investigation of the physiological roles of mitophagy. Here, we review recent progress in the understanding of the molecular mechanisms and functional importance of mitophagy in yeast at multiple levels.
ON THE PROJECTIVE FOURFOLDS WITH ALMOST NUMERICALLY POSITIVE CANONICAL DIVISORS
Fukuda, Shigetaka Korean Mathematical Society 2006 대한수학회보 Vol.43 No.4
Let X be a four-dimensional projective variety defined over the field of complex numbers with only terminal singularities. We prove that if the intersection number of the canonical divisor K with every very general curve is positive (K is almost numerically positive) then every very general proper subvariety of X is of general type in ';he viewpoint of geometric Kodaira dimension. We note that the converse does not hold for simple abelian varieties.