RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 원문제공처
          펼치기
        • 등재정보
          펼치기
        • 학술지명
          펼치기
        • 주제분류
          펼치기
        • 발행연도
          펼치기
        • 작성언어

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • KCI등재

        일본내 연구동향 ( 6 편중 제 2 편 )

        (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.

      • KCI등재후보

        What Less-Proficient EFL Learners Tell Us about Their Language Learning: Qualitative Analysis of Self-Regulated Learning

        Akiko Fukuda 범태평양 응용언어학회 2019 Journal of Pan-Pacific Association of Applied Ling 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.

      • KCI등재

        Applications of Cure Monitoring Techniques by Using Fiber Optic Strain Sensors to Autoclave, FW and Rm Molding Methods

        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.

      • KCI등재

        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.

      • Redox-coupled proton transfer mechanism in nitrite reductase revealed by femtosecond crystallography

        Fukuda, Yohta,Tse, Ka Man,Nakane, Takanori,Nakatsu, Toru,Suzuki, Mamoru,Sugahara, Michihiro,Inoue, Shigeyuki,Masuda, Tetsuya,Yumoto, Fumiaki,Matsugaki, Naohiro,Nango, Eriko,Tono, Kensuke,Joti, Yasumas National Academy of Sciences 2016 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.113 No.11

        <P>Proton-coupled electron transfer (PCET), a ubiquitous phenomenon in biological systems, plays an essential role in copper nitrite reductase (CuNiR), the key metalloenzyme in microbial denitrification of the global nitrogen cycle. Analyses of the nitrite reduction mechanism in CuNiR with conventional synchrotron radiation crystallography (SRX) have been faced with difficulties, because X-ray photoreduction changes the native structures of metal centers and the enzyme-substrate complex. Using serial femtosecond crystallography (SFX), we determined the intact structures of CuNiR in the resting state and the nitrite complex (NC) state at 2.03- and 1.60-angstrom resolution, respectively. Furthermore, the SRX NC structure representing a transient state in the catalytic cycle was determined at 1.30-angstrom resolution. Comparison between SRX and SFX structures revealed that photoreduction changes the coordination manner of the substrate and that catalytically important His255 can switch hydrogen bond partners between the backbone carbonyl oxygen of nearby Glu279 and the side-chain hydroxyl group of Thr280. These findings, which SRX has failed to uncover, propose a redox-coupled proton switch for PCET. This concept can explain how proton transfer to the substrate is involved in intramolecular electron transfer and why substrate binding accelerates PCET. Our study demonstrates the potential of SFX as a powerful tool to study redox processes in metalloenzymes.</P>

      • KCI등재

        Diagnosis and treatment of abnormal dental pain

        Fukuda, Ken-ichi The Korean Dental Society of Anesthsiology 2016 Journal of Dental Anesthesia and Pain Medicine Vol.16 No.1

        Most dental pain is caused by an organic problem such as dental caries, periodontitis, pulpitis, or trauma. Diagnosis and treatment of these symptoms are relatively straightforward. However, patients often also complain of abnormal dental pain that has a non-dental origin, whose diagnosis is challenging. Such abnormal dental pain can be categorized on the basis of its cause as referred pain, neuromodulatory pain, and neuropathic pain. When it is difficult to diagnose a patient's dental pain, these potential alternate causes should be considered. In this clinical review, we have presented a case of referred pain from the digastric muscle (Patient 1), of pulpectomized (Patient 2), and of pulpectomized pain (Patient 3) to illustrate referred, neuromodulatory, and neuropathic pain, respectively. The Patient 1 was advised muscle stretching and gentle massage of the trigger points, as well as pain relief using a nonsteroidal anti-inflammatory and the tricyclic antidepressant amitriptyline. The pain in Patient 2 was relieved completely by the tricyclic antidepressant amitriptyline. In Patient 3, the pain was controlled using either a continuous drip infusion of adenosine triphosphate or intravenous Mg2+ and lidocaine administered every 2 weeks. In each case of abnormal dental pain, the patient's diagnostic chart was used (Fig.2 and 3). Pain was satisfactorily relieved in all cases.

      • SCOPUSKCI등재

        Algebraic Fiber Space Whose Generic Fiber and Base Space Are of Almost General Type

        Fukuda, Shigetaka Department of Mathematics 2014 Kyungpook mathematical journal Vol.54 No.2

        We assume that the existence and termination conjecture for flips holds. A complex projective manifold is said to be of almost general type if the intersection number of the canonical divisor with every very general curve is strictly positive. Let f be an algebraic fiber space from X to Y. Then the manifold X is of almost general type if every very general fiber F and the base space Y of f are of almost general type.

      • SCISCIESCOPUS

        Zygotic VegT is required for Xenopus paraxial mesoderm formation and is regulated by Nodal signaling and Eomesodermin

        Fukuda, Masakazu,Takahashi, Shuji,Haramoto, Yoshikazu,Onuma, Yasuko,Kim, Yeon-Jin,Yeo, Chang-Yeol,Ishiura, Shoichi,Asashima, Makoto UPV/EHU Press 2010 The International journal of developmental biology Vol.54 No.1

        <P>The T-box gene VegT plays a crucial role during mesendoderm specification of the amphibian embryo. While the function of maternal VegT (mVegT) has been extensively investigated, little is known about the function and transcriptional regulation of zygotic VegT (zVegT). In the present study, we used comparative genomics and a knockdown experiment to demonstrate that zVegT is the orthologous gene of zebrafish Spadetail/Tbx16 and chick Tbx6L/Tbx6, and has an essential role in paraxial mesodermal formation. zVegT knockdown embryos show several defects in the patterning of trunk mesoderm, such as abnormal segmentation of somites, a reduction in muscle, and the formation of an abnormal mass of cells at the tail tip. We also identified the cis-regulatory elements of zVegT that are necessary and sufficient for mesoderm-specific expression. These cis-regulatory elements are located in two separate upstream regions of zVegT, corresponding to the first intron of mVegT. The results of in vitro binding and functional assays indicate that Forkhead box H1 (FoxH1) and Eomesodermin (Eomes) are the trans-acting factors required for zVegT expression. Our results highlight the essential role of zVegT in organization of paraxial mesoderm, and reveal that zVegT is regulated by a coherent feedforward loop of Nodal signaling via Eomes.</P>

      • Higher Order Knowledge Processing: Pathway Database and Ontologies

        Fukuda, Ken Ichiro Korea Genome Organization 2005 Genomics & informatics Vol.3 No.2

        Molecular mechanisms of biological processes are typically represented as 'pathways' that have a graph­analogical network structure. However, due to the diversity of topics that pathways cover, their constituent biological entities are highly diverse and the semantics is embedded implicitly. The kinds of interactions that connect biological entities are likewise diverse. Consequently, how to model or process pathway data is not a trivial issue. In this review article, we give an overview of the challenges in pathway database development by taking the INOH project as an example.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼