안면외상 및 반량 처치

Oh, J . I . 대한피부과학회 1971 大韓皮膚科學會誌 Vol.9 No.3

Origin of adakite-like plutons in southern Korea

Oh, J.I.,Choi, S.H.,Yi, K. Universitetsforlaget ; Elsevier Science Ltd 2016 Lithos Vol.262 No.-

<P>We present Sr-Nd-Pb isotopic compositions for two adakite-like intrusions in southern Korea (Jindong and Bongnae), including major and trace element concentrations, and the sensitive high-resolution ion microprobe (SHRIMP) zircon U-Pb age. Our aim is to constrain the origin and tectonomagmatic processes that gave rise to the plutons. A SHRIMP U-Pb zircon age of 88.7 +/- 0.7 Ma was obtained from a Jindong granodiorite sample. The Jindong plutons belong to the medium-K calc-alkaline series, and have an overall enrichment in large ion lithophile elements (LILE), such as K, Rb, Ba, and Pb, and a relative depletion in high field strength elements, such as Nb, Ta, and Ti, compared with the neighboring elements in the primitive mantle-normalized multi trace element variation diagram. It was found that (Sr-87/Sr-86); = 0.70475-0.70596, (Nd-143/Nd-144)(i) = 0.512547-0.512604, [(epsilon(Nd))(i) = +0.4 to 22], and (Pb-206/Pb-204)(i) = 18.19-18.37, which fall within the field of the arc-type Cretaceous to Tertiary Bulguksa intrusive rocks in the Sr-Nd and Pb-Pb isotopic correlation diagrams. The elevated Sr/Y (17-40), but low La/Yb (3.7-8.8) ratios of the Jindong plutons, together with their coherent geochemical trends and U-shaped rare earth element (REE) patterns, indicate that they were not formed by slab melting, but by amphibole-dominated fractional crystallization of the Bulguksa-like arc magma. A SHRIMP U-Pb zircon age of 226.5 +/- 2.5 Ma was obtained from a Bongnae tonalite sample. The Bongnae plutons belong to the shoshonitic series. Their trace element patterns resemble the Jindong samples, but are characterized by significantly negative U anomalies in mafic rocks. They also have elevated MgO, Ni, Co, Cr, Rb, Ba, Sr, and low Al2O3 and Na2O contents at a given SiO2 concentration compared with the Jindong plutons, and are typified by highly radiogenic Sr and unradiogenic Nd and Pb isotopic compositions: [(Sr-87/Sr-86); = 0.71096-0.71290, (Nd-143/Nd-144)(i) = 0.511641-0.511681, (epsilon(Nd))(i) = -13.0 to -13.8, and (Pb-206/Pb-204)(i) = 17.53-17.45]. The Bongnae plutons have adakite-like elevated Sr/Y (36-56) and La/Yb (12.9-42.7) ratios, but are highly potassic compared with slab melts. The petrogenesis of the C-type Bongnae adakites is consistent with formation by the partial melting of two components (a lower crust and metasomatized lithospheric mantle) in a post-collisional tectonic setting. Asthenospheric upwelling induced by slab breakoff after continental collision between the north and south China blocks may be a heat source for melting of the continental lithosphere. The Paleo-Tethys subduction before continental collision in this area or lower crustal delamination and subsequent low fractions of melting may have induced metasomatic overprinting in LILE in the overlying lithospheric mantle. (C) 2016 Elsevier B.V. All rights reserved.</P>

Small-sided game 트레이닝이 유소년 축구선수의 유, 무산소 능력과 경기 중 활동 형태에 미치는 영향

오지우(OhJi-woo),이용수(LeeYoung-soo),성기운(SungKi-woon) 한국체육학회 2018 한국체육학회지 Vol.57 No.5

본 연구는 7주간의 small-sided game(SSG) 트레이닝이 중학교 축구선수의 유, 무산소 능력 및 경기 중 활동 형태에 미치는 효과를 분석하는데 목적이 있다. 이를 위해 경력 3년 이상의 중학교 축구선수 16명을 비교집단인 인터벌 트레이닝 그룹(Interval training group, ITG, n=8)과 실험집단인 SSG를 수행한 SSGG(Small-sided game training group, n=8)그룹으로 무선 배정하였다. 각 그룹은 모든 기존의 팀 훈련은 동일하게 제한한 환경에서 7주간 주2회 60분씩 각각의 트레이닝 프로그램을 추가로 수행하였다. 7주간의 트레이닝의 결과, 트레이닝 전과 비교하여 유산소성 능력은 두 그룹 모두에서 유의하게 증가된 반면 (p<.05), 무산소성 능력의 지표인 평균 파워가 ITG에서 유의하게 증가하였으나(p<.05), SSGG에서 통계적으로 유의한 증가가 나타나지 않았다. 실제 경기의 모의 형태인 SSG 트레이닝이 경기 중 선수들의 활동 형태의 변화를 유도하는 지를 알아보기 위해 영상촬영을 통해 선수들의 움직임을 기록하고 트레이닝 전, 후의 변화를 분석하였다. 7주간의 SSG를 통해 선수들은 경기 중 총 이동거리가 증가하였으며(p<.01) running (p<.05), HIR (p<.01)과 같은 고강도 형태의 움직임의 비율이 유의하게 증가하였다. 결론적으로, SSG트레이닝은 유소년 축구 선수의 유산소성 능력의 향상에 기여할 뿐만 아니라 경기 중 활동 형태를 더욱 활발한 형태로 변화시켰으며 총 이동거리 또한 증가시켰다. 따라서 기술과 체력의 균형적인 발달이 요구되는 유소년 선수들에게 SSG트레이닝이 체력 발달에 집중된 전통적 트레이닝 방법의 효과적인 대안이 될 수 있을 것으로 사료된다. The purpose of this study is to determine effects of small-sided game (SSG) on aerobic, anerobic capacity and activity pattern in youth elite football players. 16 soccer players were randomly assigned to interval training group (ITG, n=8) and small-sided game training group (SSGG, n=8). Participants performed interval and small-sided game training twice a week for 7 weeks in addition to regular football team training. Participants were performed Yo-Yo intermittent test to examine differences of aerobic capacity in ITG and SSGG. Both groups showed significant increase in aerobic capacity (p<.05). In relation to anaerobic capacity, ITG showed improvement in mean power of the Wingate test (p<.05) whereas SSGG did not show any improvement. To examine the effect of SSG training on activity profile, we recorded and analysed the activities of players in SSGG during SSG. After SSG training for 7 weeks, the participants covered longer total distances (p<.01) and high intensity movement, such as running (p<.05) and high intensity running (p<.01). In conclusion, SSG training can be used as regular training to improve aerobic capacity and activity pattern in youth elite football players.

MODELING OF A REPULSIVE TYPE MAGNETIC BEARING FOR FIVE AXIS CONTROL INCLUDING EDDY CURRENT EFFECT

T.Ohji,S.C.Mukhopadhyay,M.I wahara,S.Yamada 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-

So far a single-axis controlled repulsive type magnetic bearing system have been designed and fabricated in our laboratory employing the repulsive forces operating between the stator and rotor permanent magnet for levitation. The radial axis is uncontrolled passive one The higher speed of operation is limited due to the vibration along the uncontrolled axis and the increase of control current due to eddy current interference. This paper will discuss a detailed modeling of the repulsive type magnetic bearing system for five axis control including the eddy current effect and the method of reduction of eddy current effect Simulation results using Matlab will be presented.<br/>

철강제조공정에 있어서 신기술 적용의 현황과 장래 ( 신일본제철의 군진제철소 사례를 중심으로 )

왕사육만 (王寺陸滿) ( Mutsumi Ohji ) 대한금속재료학회 1991 大韓金屬學會會報 Vol.4 No.3

철강제조공정에 있어서 신기술 적용의 현상과 장래방향

왕사목만 (王寺睦滿) ( Mutsumi Ohji ) 대한금속재료학회 1991 대한금속재료학회 학술대회 개요집 Vol.1991 No.0

Comparison of hot-corrosion behavior of Al2O3, Lu2O3 and their silicates

Shunkichi Ueno,Tatsuki Ohji,Hua-Tay Lin 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.3

The hot-corrosion behavior of Al2O3, Lu2O3, mullite and Lu2Si2O7 phases were examined at 1500 oC. In the case of Lu2O3, no phase change was observed and no anisotropical corrosion occurred. In the case of the Lu2Si2O7 phase, anisotropic corrosion was observed. The Lu2Si2O7 crystal grains were well sustained to the hot-corrosion, however, the sodium element diffused though the boundary phase and anomalous grain growth occurred. On the other hand, in the case of Al2O3, the grains at the bulk surface corroded anisotropically. The corroded grain had a characteristic morphology as terrace field. In the case of mullite, the surface of the bulk was decomposed to the Al2O3 phase and the silica component was completely removed from the bulk surface. The sodium ions diffused though the sample during the corrosion test. The hot-corrosion behavior of Al2O3, Lu2O3, mullite and Lu2Si2O7 phases were examined at 1500 oC. In the case of Lu2O3, no phase change was observed and no anisotropical corrosion occurred. In the case of the Lu2Si2O7 phase, anisotropic corrosion was observed. The Lu2Si2O7 crystal grains were well sustained to the hot-corrosion, however, the sodium element diffused though the boundary phase and anomalous grain growth occurred. On the other hand, in the case of Al2O3, the grains at the bulk surface corroded anisotropically. The corroded grain had a characteristic morphology as terrace field. In the case of mullite, the surface of the bulk was decomposed to the Al2O3 phase and the silica component was completely removed from the bulk surface. The sodium ions diffused though the sample during the corrosion test.

Designing lutetium silicate environmental barrier coatings for silicon nitride and its recession behavior in steam jets

Shunkichi Ueno,Tatsuki Ohji,Hua-Tay Lin 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.1

To protect silicon nitride ceramics from water vapor corrosion and oxidation, a new multi-layered environmental barrier coating (EBC) system was developed. The EBC system consisted of a highly dense Lu2SiO5/Lu2Si2O7 binary phase layer and slightly porous Lu2SiO5/Lu2Si2O7 layer, which were coated by a sputtering and dipping technique, respectively. A steam jet exposure test was conducted at 1300 oC for 500 hours with 35 m/s water vapor velocity. Each grain of the dip-coated layer was peeled off from the surface during the test. Also, the highly dense sputter coated layer converted into a porous layer after the test.

Alumina/SiC 나노복합재료에서의 잔류 열응력 완화거동에 관한 연구

Y. H. Choa,K.Niihara,T. Ohji,J. P. Singh 한국분말야금학회 2002 한국분말야금학회 학술대회논문집 Vol.2002 No.1

Plastic deformation was observed by TEM around the intragranular SiC particles in the matrix for nanocomposite system. The dislocations are generated at selected planes and there is a tendency for the dislocations to form a subgrain boundary structure with low-angel grain boundaries and networks. In this study, dislocation generated in the matrix during cooling down from sintering temperatures by the highly localized thermal stresses within and/or around SiC particles caused from the thermal expansion mismatch between matrix and SiC particle was observed. In monolithic and microcomposite system. These phenomena is closely related to the plastic relaxation of the elastic stress and strain energy associated with both thermal misfitting inclusions and creep behaviors. The plastic relaxation behavior was explained by combination of yield stress and internal stress.

Platinum Nano-Dispersion via In Situ Processing : Preparation and catalytic Property of Porous Nanocomposite

Yoshikazu,Hwang Hae-Jin,Naoki Kondo,Tatsuki Ohji 한국분말야금학회 2001 한국분말야금학회지 Vol.8 No.3

A bulk porous composite with plantinum nano-dispersion was synthesized in air atmosphere through the combination of several in situ reactions, including the pyrolysis of . A mixture of (dolomite), , and LiF (0.5 wt%, as an additive) was cold isostatically pressed at 200 MPa and sintered at for 2 h. The porous composite ( : Pt=99 : 1 in volume) had a uniformly open-porous structure (porosity: 56%) with three-dimensional (3-D) network and a narrow pore-size distribution, similarly to the porous composites reported before. Catalytic Properties (viz., NO direct decomposition and NO reduction by ) of the composite were investigated up to . In the absence of oxygen, the NO conversion rate reached ~52% for the direct decomposition and ~100% for the reduction by , respectively. The results suggest the possibility of the porous composite as a multifunctional filter, i.e., simultaneous hot gas-filtering and in one component.