Ability to reconstruct practice tasks required of a coach - Taking the example of “Any 3/3 travel in flairs with 1/1 spindle inside two circles (Urzica 2)” in the pommel horse -

Kojiro Yanagi,Kiyora Ito,Daisuke Murayama 한국코칭능력개발원 2024 International Journal of Coaching Science Vol.18 No.1

At a training site that encourages athletes to generate movement, it may not be possible to successfully generate a sense of movement simply by presenting the athletes with step-by-step practice published in general instruction manuals; the coach is required to tailor the road individually to the goal. In competitive sports that require high performance, there is a strong interest in the optimal road of coaching. However, few studies have clarified the coachs ability to build practice procedures by real coaching spot. The purpose of this study was to focus on the ability of coaches to build staged practice, and to present how to teach “Any 3/3 travel in flairs with 1/1 Spindle inside two circles (Urzica 2)” in the pommel horse in gymnastics, and by considering this from a phenomenological standpoint, we aim to gain new knowledge regarding the structure and modification ability of coachs practice stages. The method of this study was to select University Gymnast-A from among 20 male university gymnast participants and analyze them. The first step was to conduct a structural analysis of the target elements as a prerequisite for constructing the technical training path. Next, in order to analyze the structure of the practice stages, kinesthetic coaching for Gymnast-A was presented. Finally, the coachs kinesthetic orientation was analysed from a phenomenological standpoint. In the analysis, a phenomenological reflective analysis was conducted to examine how the coach constructed practice stage suitable for the players from the perspective of kinesthetic meaning and suitability of arrangement. It is important to get high scores in gymnastics competition to this element (Urzica 2) acquiring, and it is one that top gymnasts in recent years have incorporated into their performance program. This phenomenological analysis of the construction of the practice stages of the element not only provided new insights into the construction of the coachs practice stages and his ability to modify them, it also provided effective insights into the coaching of high-difficulty elements in gymnastics.

Concrete filled double skin tubular members subjected to bending

Kojiro Uenaka,Hiroaki Kitoh,Keiichiro Sonoda 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.4

A concrete filled double skin tubular (called CFDST in abbreviation) member consists of two concentric circular steel tubes and filled concrete between them. Purpose of this study is to investigate their bending characteristics experimentally. The two test parameters of the tubes considered were an inner-to-outer diameter ratio and a thickness-diameter ratio. As a result, their observed failure modes were controlled by tensile cracking or local buckling of the outer tube. Discussion is focused on the confinement effect on the filled concrete due to the both tubes and also the influence of the inner-to-outer diameter ratios on their deformability and load carrying capacity.

" Nano - Scale Structural Characterization and Evaluation of Bonding Interface in High Density Electronic Integrated Circuit "

(Kojiro F . Kobayashi) 서울시립대학교 산업기술연구소 2001 국제학술SYMPOSIUM논문집 Vol.9 No.1

Mechanical characteristics of hollow shear connectors under direct shear force

Kojiro Uenaka,Hiroshi Higashiyama 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.2

The steel-concrete composite decks have high fatigue durability and deformability in comparison with ordinary RC slabs. Withal, the steel-concrete composite deck is mostly heavier than the RC slabs. We have proposed herein a new type of steel-concrete composite deck which is lighter than the typical steel-concrete composite decks. This can be achieved by arranging hollow sectional members as shear connectors, namely, half-pipe or channel shear connectors. The present study aims to experimentally investigate mechanical characteristics of the half-pipe shear connectors under the direct shear force. The shear bond capacity and deformability of the half-pipe shear connectors are strongly affected by the thickness-to-diameter ratio. Additionally, the shear strengths of the hollow shear connectors (i.e. the half-pipe and the channel shear connectors) are compared. Furthermore, shear capacities of the hollow shear connectors equivalent to headed stud connectors are also discussed.

Concrete filled double skin square tubular stub columns subjected to compression load

Kojiro Uenaka 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.6

Concrete filled double skin tubular members (CFDST) consist of double concentric circular or square steel tubes with concrete filled between the two steel tubes. The CFDST members, having a hollow section inside the internal tube, are generally lighter than ordinary concrete filled steel tubular members (CFT) which have a solid cross-section. Therefore, when the CFDST members are applied to bridge piers, reduction of seismic action can be expected. The present study aims to investigate, experimentally, the behavior of CFDST stub columns with double concentric square steel tubes filled with concrete (SS-CFDST) when working under centric compression. Two test parameters, namely, inner-to-outer width ratio and outer square steel tube’s width-to-thickness were selected and outer steel tube’s width-to-thickness ratio ranging from 70 to 160 were considered. In the results, shear failure of the concrete fill and local buckling of the double skin tubes having largest inner-toouter width ratio were observed. A method to predict axial loading capacity of SS-CFDST is also proposed. In addition, the load capacity in the axial direction of stub column test on SS-CFDST is compared with that of double circular CFDST. Finally, the biaxial stress behavior of both steel tubes under plane stress is discussed.

My 40-year adventure in pursuit of discovery of early hepatocellular carcinoma: errors and successes

( Masamichi Kojiro ) 대한간학회 2007 추계 학술대회 Vol.13 No.-

Until 3 decades ago, hepatocellular carcinoma (HCC) was a major problem only in Asian and African countries, but it has become a common problem for gastroenterologists, radiologists, and pathologists in West as well because of a increasing tendency of HCC in Western countries. When I started studying HCC 39 years ago, most of HCCs had been detected in advanced stage and the survival time after diagnosis was only 3-6 months. However, the remarkable advances in clinical diagnostic approaches, in particular the developments of various diagnostic imagings and ultrasound-guided fine-needle biopsy, and the establishment of follow-up system of high-risk population, detection of small HCC of the early stage has become possible and increasing number of HCC has been successfully treated surgically or medically, and the survival time has remarkably elongated and patients with more than 10-year survival are not rare at the present time. When ultrasound-guided fine-needle aspiration biopsy was first introduced for early diagnosis of HCC more than two decades ago in our institute, we pathologists diagnosed most biopsy specimens from minute well-differentiated HCCs as hyperplastic nodule, regenerative nodule, or merely non-tumorous liver tissue. However, most of those minute lesions had evolved to classical HCC within a short period, and we began to pay careful attention to these benign-looking nodular lesions. With the increase in resected cases and availability of biopsy samples of early-stage small HCCs, we finally realized that many such lesions are highly well differentiated and have morphologic features quite different to those of classical HCCs. However, it took a certain period that a new pathologic concept of early stage HCC was widely accepted in Japan. Although HCC was not a matter of interest to Western pathologists until some years ago because of a relative infrequency, HCC and equivocal nodular lesions have become to be spotlighted among Western pathologists along with increased liver transplantation for HCC. With such a background, the diagnostic discrepancy of early stage HCC and equivocal nodular lesions between the West and Japan has become a controversial issue. In 2002, the International Consensus Group for Hepatic Neoplasia (ICGHN) has been established to resolve the discrepancy, and consensus on the pathologic diagnosis of equivocal nodular lesions is coming in sight after several meetings. Meanwhile, remarkable advances and popularization of imaging modalities also have enabled the depiction of various nodular lesions mimicking HCC that were formerly encountered only incidentally at laparatomy and autopsy, and they posed another problem in pathologic practice. In fact, it frequently happened that various non-HCC nodules such as liver cell adenoma, focal nodular hyperplasia (FNH), angiomyolipoma, epithelioid hemangiendothelioma, and carcinoid tumor were misdiagnosed as HCC on biopsy specimen. However, such a diagnostic confusion has been gradually resolved with a bitter experience in the past decade.

My 40-year adventure in pursuit of discovery of early hepatocellular carcinoma: errors and successes

Masamichi Kojiro 대한간학회 2007 Clinical and Molecular Hepatology(대한간학회지) Vol.13 No.4(S)

Hepatocellular Carcinoma 2000 in Korea : Dedifferentiation and tumor progression of hepatocellular carcinoma in the early stage

( Masamichi Kojiro ) 대한간암연구회 1999 대한간암연구회 학술심포지엄 Vol.- No.-

Symposium (2) : Hepatocellular Carcinoma ; Progression of Hepatocellular Carcinoma: Early to Advanced

( Masamichi Kojiro ) 대한소화기학회 1995 SIDDS Vol.3 No.-

파랑작용에 의한 모래지반의 액상화에 관한 대형 수리모형실험

강윤구,KOJIRO SUZUKI 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.3

A series of large-scale experiments were carried out in order to examine wave-induced liquefaction in a loosely packed sandbed, its afterward high densification and liquefaction by oscillatory pore pressure. The experiments were conducted in a Large Hydro-Geo Flume that can nearly solve the problems of scale effects of the sandbed, and the 50% sieve diameter of sand was 0.2 mm. The generation of residual pore pressure and its afterward high densification which had observed by Takahashi et al. (1999) in a wave flume experiment using fine sand with the size of 0.08 mm. As a result, the relative density of the sandbed after high densification was increased up to 79% and liquefaction by oscillatory pore pressure was not observed.최근들어 매년 만성적으로 되풀이되고 있는 적조발생 등 환경악화와 이에 따른 수산 어획량 감소 등 많은 환경문제가 야기되고 있다. 이에 대한 원인 중의 하나가 연안역 개발에 따른 갯벌 및 천해역 매립에 있다는 인식과 함께 갯벌 보전과 창출(인공갯벌의 조성)에 대한 사회적인 요구가 강하게 고조되고 있다. 특히 갯벌과 천해역을 인공적으로 조성하는 방안이 대안으로 떠오르고 있지만, 인공적으로 조성시 나타날 수 있는 문제점에 대해서는 아직 구체적인 논의가 이루어지지 않고 있다.갯벌 및 천해역을 인공적으로 조성할 경우 이들 지반은 일반적으로 느슨한 상태로 조성되며, 조성후 파랑작용을 받을 경우 지진시에 발생하는 현상과 비슷한 잔류간극수압의 발생을 동반한 대규모의 액상화가 발생할 가능성이 높다. 또한 이러한 지반 부근에 구조물을 설치한 경우에는 구조물이 파랑에 의한 액상화로 인해 대규모의 파괴로 이어질 수 있다.