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Matsukawa Keitaro,Yato Yoshiyuki,Imabayashi Hideaki 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.5
Study Design: Biomechanical study. Purpose: To quantitatively investigate the effect of screw size on screw fixation in osteoporotic vertebrae with finite element analysis (FEA) Overview of Literature: Osteoporosis poses a challenge in spinal instrumentation; however, the selection of screw size is directly related to fixation and is closely dependent on each surgeon’s experience and preference. Methods: Total 1,200 nonlinear FEA with various screw diameters (4.5–7.5 mm) and lengths (30–50 mm) were performed on 25 patients (seven men and 18 women; mean age, 75.2±10.8 years) with osteoporosis. The axial pullout strength, and the vertebral fixation strength of a paired-screw construct against flexion, extension, lateral bending, and axial rotation were examined. Thereafter, we calculated the equivalent stress of the bone-screw interface during nondestructive loading. Then, using diameter parameters (screw diameter or screw fitness in the pedicle [%fill]), and length parameters (screw length or screw depth in the vertebral body [%length]), multiple regression analyses were performed in order to evaluate the factors affecting various fixations. Results: Larger diameter and longer screws significantly increased the pullout strength and vertebral fixation strength; further, they decreased the equivalent stress around the screws. Multiple regression analyses showed that the actual screw diameter and %length were factors that had a stronger effect on the fixation strength than %fill and the actual screw length. Screw diameter had a greater effect on the resistance to screw pullout and flexion and extension loading (β=0.38–0.43, p<0.01); while the %length had a greater effect on resistance to lateral bending and axial rotation loading (β=0.25–0.36, p<0.01) as well as mechanical stress of the bone-screw interface (β=−0.42, p<0.01). Conclusions: The screw size should be determined based on the biomechanical behavior of the screws, type of mechanical force applied on the corresponding vertebra, and anatomical limitations.
Provincial or Provincializing? : Mapping the Problems of English Departments in Japan
Yuko, Matsukawa Ewha Institute of English and American Studies 2007 Journal of English and American studies Vol.6 No.-
Although in other countries or regions, the provincializing of English seems to be more or less a fait accompli, I argue that in a Japanese context, English departments as well as scholars invested in English and English studies vacillate between being provincial and trying to provincialize. Part of the problem has to do with audience, transmission, and language: for instance, is such a decentering possible when scholars write in Japanese for a Japanese audience without necessarily engaging actively in conversations with colleagues elsewhere? In this presentation, I explicate this issue through a discussion of the problems of pedagogy and professionalization that keep us provincial and introduce some ways in which provincializing may gain momentum within the Japanese academy.
松川雅信(Matsukawa, Masanobu) 동아시아일본학회 2024 일본문화연구 Vol.- No.89
Abe Yoshio is known to have conducted groundbreaking research on the comparison and negotiation of ideas between Japan and Korea centered on Lee Toegye. However, in fact, Abes research framework, which bears fruit in his masterpiece “Japannese Neo-Confucianism and Korea” (Published by the University of Tokyo, 1965) was formed at Keijo Imperial University in the early 1940s. So how did the colonial Korea during the war affect his research? In this article, we tried to examine such problems by focusing on Abes research on Yamazaki Ansai since the 1930s. After the review, it was revealed that Abe had argued that the “Kôdô’s Confucianism” was founded by Ansai, who was influenced by Lee Toegye, and formed a logic to mobilize the Korean Confucianism to the war based on the theory of “Kôdô’s Confucianism”. There is no doubt that the empirical results of Abes research are still beneficial. However, we will need to get this historical fact right.
Mixing Memory and Science: Kimiko Hahn`s Toxic Flora and the Idea of Home
( Yuko Matsukawa ) 한국영미문학페미니즘학회 2016 영미문학페미니즘 Vol.24 No.1
Toxic Flora (2010) marks a significant departure from Asian American poet Kimiko Hahn’s previous poetry collections in terms of subject matter and form. These poems have their origins in various science articles from the New York Times and serve as meditations on nature and human nature, punctuated with musings by an “I” whose voice seems more mature and quietly confident compared to Hahn’s previous collections. However, when read in the context of her other work, we see that the issues she is most passionate about subjectivity, language, home- continue to weave themselves into the fabric of Toxic Flora. In Toxic Flora, in addition to the usual themes, there is a new intellectual curiosity for things scientific and a strong sense of discovering “In things the most unlike some qualities / Having relationship and family ties” (from Memoirs of the Life of Sir Humphrey Davy) as she notes in the epigraph of her book. The poems are grouped into sections with topics running the gamut from insects to birds to planets to extinct species to sea creatures to dinosaurs to the brain, divided by short paragraphs that provide a running commentary on sexual cannibalism. The science articles, which serve as an archive of public memory, are tied to personal memories about family and friends of the poems’ speaker as she “traces analogies” and “fervent geography.” Through these, she gains new ways to organize her life by acknowledging the passage of time: for instance, a past marriage is like an extinct animal; Maui, her mother’s childhood home, becomes a Darwinian locale; her late mother is memorialized in the heavens; and her concerns about her grown daughters alter. Thus, the act of remembering and sorting via science reconfigures family and home for Hahn’s poetic alter ego to redefine herself in the twenty-first century.
Hand Movement-Induced Eyeblink Bursts in a Patient With Parkinson’s Disease
Gohei Yamada,Noriyuki Matsukawa 대한파킨슨병및이상운동질환학회 2022 Journal Of Movement Disorders Vol.15 No.2
The blink reflex is a brainstem reflexevoked by mechanical stimulation of the cornea, electricalstimulation of the supraorbital nerve, auditory stimulation, visualstimulation, and mechanical or electrical stimulation of thelimbs. Here, we present the first case of eyeblink bursts that wereinduced while the patient performed hand movement.