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Study on the movements of the football players and a ball using the three-dimension analysis
Akira Kan,Mitsuhisa Shiokawa,Ken Okihara,Tatsuya Deguchi,Chul Soon Choi,Seung Wook Choi,Kazufumi Takahashi,Sachio Usui 한국체육과학회 2002 한국체육과학회지 Vol.11 No.1
Required physical abilities or factors for players are researched using indirect data, Physiology of Exercise. The purpose of this paper is measuring players running distance and various types of speed as direct data. Setting two video cameras (SONY DCR-VX1000), each one covering an entire pitch, recorded one of the J-LEAGUE MATCHES. It captured every 1/3sec frame from the recorded tape, and coordinated positions of all players' movements and ball using application software (MPJapan TOMOKO-VM). The coordinated positions data are treated with original application software. After analyzing the data, we found the following; 1) Average distance of each player moved on the match was about 13 to 14 ㎞. GK's distance was about 60% of field players. 2) Increasing players running speed, the number of one's propotion was decreased. 3) Each team showed similar total distances with the 1st and 2nd half, and the 2nd half distance indicated much longer than the 1st half. In comparison each plaver's 1st half distance and 2nd half, it was not unified.
Akira Tsunoda,Tomoko Takahashi,Kenji Sato,Hiroshi Kusanagi 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.4
Purpose: External rectal prolapse (ERP) is frequently associated with other pelvic disorders, such as enterocele, rectocele, and perineal descent. Evacuation proctography makes it possible to visualize the development of such anatomical abnormalities. The aim of this study was to identify the variables that would predict associated abnormalities in patients with ERP.Methods: Between February 2010 and August 2019, 124 female patients with ERP, who were evaluated using proctography were included in this study. Enterocele was diagnosed when the extension of the loop of the small bowel was located between the vagina and rectum. A significant rectocele was defined as >20 mm in diameter. Multivariate analysis was used to establish which morphological parameters best predicted the presence of enterocele or rectocele.Results: Sixty-five patients had ERP alone, while 59 patients (47.6%) had additional findings on proctography. The most frequently associated abnormality was enterocele with 48 of the patients (38.7%) having this condition. Rectocele was detected in 17 of the 124 patients (13.7%). The median length of the ERP was 30 mm (range, 7 to 147 mm). The results of the stepwise multiple regression analysis showed that a history of hysterectomy and the length of the ERP were significantly associated with the presence of enterocele. The analysis showed that the longer the prolapse, the higher the incidence of enterocele. A history of hysterectomy was also significantly associated with the presence of rectocele.Conclusion: Patients with ERP often have associated anatomical abnormalities and should be investigated thoroughly before planning surgical treatment.
Mizuna Takahashi,Keiichi Uchida,Shinichiro Yamada,Noriyuki Sugino,Yukihito Higashi,Kazuhiro Yamada,Akira Taguchi 대한골다공증학회 2016 Osteoporosis and Sarcopenia Vol.2 No.4
Abstract Mandibular cortical erosion detected on dental panoramic radiographs is associated with increased risk of osteoporosis in older adults. Additionally, many reports have demonstrated an association between decreased number of teeth present and osteoporosis. However, whether mandibular cortical erosion is associated with a decreased number of teeth remains unclear. The purpose of this study, therefore, was to clarify the association between mandibular cortical erosion and number of teeth present in Japanese men and women aged 40 years and older. Among patients who visited our university hospital and underwent dental panoramic radiography for the diagnosis of dental diseases, 839 patients (293 men and 546 women) aged 40e89 years (mean [SD], 63.7 [10.6] years) participated in this study. Multiple regression analysis revealed that mildly to moderately eroded cortex (p ¼ 0.007) and severe eroded cortex (p < 0.001) were significantly associated with a decreased number of teeth present. Analysis of covariance adjusted for covariates revealed a significant association between mandibular cortical erosion category and number of teeth present (p < 0.001). Subjects with a severely eroded cortex had significantly fewer teeth present than those with a normal cortex (mean [SE], 20.7 [0.5] vs. 23.4 [0.3], p < 0.001) or mildly to moderately eroded cortex (22.2 [0.4], p ¼ 0.04). Subjects with a mildly to moderately eroded cortex had significantly fewer teeth present than those with a normal cortex (p ¼ 0.033). Our results suggest the significant association between mandibular cortical erosion and number of teeth present in Japanese men and women aged 40 years and older.
Yoshikazu Takahashi,Toru Takeuchi,Shoichi Kishiki,Yozo Shinozaki,Masako Yoneda,Koichi Kajiwara,Akira Wada Council on Tall Building and Urban Habitat Korea 2023 International journal of high-rise buildings Vol.12 No.1
Seismic isolation and vibration control techniques have been developed and put into practical use by challenging researchers and engineers worldwide since the latter half of the 20th century, and after more than 40 years, they are now used in thousands of buildings, private residences, highways in many seismic areas in the world. Seismic isolation and vibration control structures can keep the structures undamaged even in a major earthquake and realize continuous occupancy. This performance has come to be recognized not only by engineers but also by ordinary people, becoming indispensable for the formation of a resilient society. However, the dynamic characteristics of seismically isolated bearings, the key elements, are highly dependent on the size effect and rate-of-loading, especially under extreme loading conditions. Therefore, confirming the actual properties and performance of these bearings with full-scale specimens under prescribed dynamic loading protocols is essential. The number of testing facilities with such capacity is still limited and even though the existing labs in the US, China, Taiwan, Italy, etc. are conducting these tests, their dynamic loading test setups are subjected to friction generated by the large vertical loads and inertial force of the heavy table which affect the accuracy of measured forces. To solve this problem, the authors have proposed a direct reaction force measuring system that can eliminate the effects of friction and inertia forces, and a seismic isolation testing facility with the proposed system (E-isolation) will be completed on March 2023 in Japan. This test facility is designed to conduct not only dynamic loading tests of seismic isolation bearings and dampers but also to perform hybrid simulations of seismically isolated structures. In this paper, design details and the realization of this system into an actual dynamic testing facility are presented and the outcomes are discussed.
Yamane, Akira,takahashi, Katsu,Bringas, Pablo,Amano, Osamu,Slavkin, Harold C.,Margarita, Zeichner-David Korean Academy of Oral Biology and the UCLA Dental 1997 International Journal of Oral Biology Vol.22 No.3
In order to elucidate the roles of insulin, IGF-Ⅰ and Ⅱ during amelogenesis, the effects of these factors on the translational activity of amelogenin, the predominant matrix protein in developing enamel, were examined in mouse embryonic molars maintained in vitro. Mouse mandibular first molars isolated from embryos on embryonic day 15 were cultured as an explant for 6, 12 and 18 days in serumless, chemically defined medium containing 1000ng/ml of insulin, 100ng/ml of IGF-Ⅰ or 100ng/ml of IGF-Ⅱ. The translational activity of amelogenin was measured by incorporation of [^35S]-methionine, immunoprecipitation with a specific amelogenin antibody followed by polyacrylamide gel electrophoresis in combination with fluorography. IGF-Ⅰ and IGF-Ⅱ induced 55% and 104% increases in the translational activity of amelogenin respectively at 6 days in culture. This effect was lost after 12 and 18 days in culture. Insulin did not produce any significant differences in the translational activity of amelogenin. These data suggested that IGF-Ⅰ and Ⅱ accelerated amelogenesis by inducing an increase in amelogenin translation in the mouse mandibular first molar in vitro.
Masatoh Takahashi,Kazuo Ogura,Hiroyuki Yoshimura,Hiroshi Iiduka,Akira Sugawara,Kiyoyuki Yambe,김원섭 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Experimental studies of coaxial oversized backward wave oscillators (BWOs) are presented. The beam voltage is weakly relativistic less than 100 kV. The slow-wave structure (SWS) consists of a rectangularly corrugated oversized hollow waveguide and rectangularly corrugated inner conductor, whose target operating frequency due to Cherenkov interaction is in the K-band. The coaxial SWS can have two surface waves caused by the inner and outer corrugations. The oversized BWO operations under the influences of two surface waves are examined. An oscillation starting voltage decreases by introducing the rectangularly corrugated inner conductor. Output powers increase greatly as compared with those without the corrugated inner conductor. The inner corrugation improves the oversized BWO operation
Foxf2 represses bone formation via Wnt2b/β-catenin signaling
Tanaka Tomoyuki,Takahashi Akira,Kobayashi Yutaka,Saito Masanori,Xiaolong Sun,Jingquan Chen,Ito Yoshiaki,Kato Tsuyoshi,Ochi Hiroki,Sato Shingo,Yoshii Toshitaka,Okawa Atsushi,Carlsson Peter,Inose Hiroyu 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Differentiation of mesenchymal stem cells (MSCs) into osteoblasts is a critical process for proper skeletal development and acquisition/maintenance of bone mass. However, since this regulatory mechanism has not yet been fully elucidated, the treatment of severe osteoporosis and fractures is a challenge. Here, through a comprehensive analysis of gene expression during the differentiation of MSCs into osteoblasts, we show that the forkhead transcription factor Foxf2 is a crucial regulator of this process. Foxf2 expression transiently increased during MSC osteoblastic differentiation. Overexpression of Foxf2 in MSCs inhibited osteoblastic differentiation, and conversely, knockdown of Foxf2 expression promoted this process. Osteoprogenitor-specific Foxf2 knockout mice developed a high bone mass phenotype due to increased bone formation. RNA-seq analysis and molecular experiments revealed that Foxf2 regulation of bone formation is mediated by Wnt2b. Knockdown of Foxf2 in mouse femurs enhanced bone regeneration in vivo. FOXF2 expression was correlated with hip bone mineral density in postmenopausal women with low bone mass. Finally, inhibition of FOXF2 promoted osteoblastic differentiation of human MSCs. This study uncovers a critical role of Foxf2 in the differentiation of MSCs into osteoblasts and provides insight into the pathogenesis associated with bone-related diseases such as osteoporosis and nonunion after fracture