• Title/Summary/Keyword: Transverse

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Air Side Heat Transfer Charactieristics of Tension Wound Transverse Fin with Minichannel (장력 감김으로 부착된 가로방향 휜-미니채널의 공기측 열전달 특성)

  • Kim Jong-Soo;Im Yong-Bin
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.6
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    • pp.701-706
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    • 2005
  • Pipes, tubes. and tubular sections with external transverse high fins have been used extensively for heating cooling, and degumidifying air and other gases. This work was performed to investigate an air side heat transfer charactieristics of minichannel with tension wound transverse fin. This estimate was confirmed conversion heat capacity the air side surface area enlargement and heat transfer charactieristics performed available inlet tube side hot water mass flux or outlet tube side air frontal air velocity. The most suitable tension wound transverse finned minichannel was measured extremely low in air side pressure drop and fin effectiveness $3.3\~4.4$. The pressure drop $0.9\~2.8Pa$ was ranged frontal air velocity $0.5\~1.2m/s$. It is also appeared that heat transfer in air side could be better conversion heat area which has been increased $330\%$ of heat capacity compared with the bare tube.

PM Interaction Diagram of RC Columns considering Confinement Effect of Transverse Steels (횡방향철근 구속효과를 고려한 철근콘크리트 기둥의 축력-모멘트 상관도)

  • Son, Hyeok-Soo;Yang, Byung-Hong;Yoon, Cheol-Kyun;Lee, Jae-Hoon
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.324-330
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    • 2005
  • The flexural strength and ductility capacity of reinforced concrete columns are largely dependent on the amount of transverse steel. However, current design code does not specify the confinement effect of transverse steels in strength calculation. A non-linear moment-curvature analysis of RC column sections was conducted in order to develop PM interaction diagram considering transverse reinforcement effects. In this paper, a more reasonable application method of PM interaction diagram considering transverse steel amounts is introduced and proposed, based on moment-curvature non-linear analysis. Also, we proposed simplified method to use. easily in practical design.

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An Experimental Study on Seismic Performance of RC Bridge Columns with Interlocking spirals and Interlocking circular hoops (결합나선철근 및 결합원형띠철근 교각의 내진성능에 관한 실험적 연구)

  • 고성현;이재훈;서진원;이지영;손혁수;최진호
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.943-948
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    • 2003
  • The experimental study for oblong section was carried out by the column test in weak axis. The column specimens had 3 types of transverse steel configurations, such as interlocking spirals, interlocking circular hoop ties and rectangular ties. The oblong columns with interlocking spirals and with interlocking circular hoop ties showed better seismic performance than the rectangular columns with rectangular hoops and cross-ties. The objectives of this study were to provide experimental data on the behavior of interlocking spiral columns under cyclic loading, to compare the performance of columns with interlocking spirals to columns with various transverse steel configurations, to study the flexural detailing of interlocking spirals, interlocking circular hoops, and other transverse steel configurations as the transverse reinforcement, and to make recommendations for the design of bridge columns incorporating interlocking spirals, circular hoops as the transverse reinforcement.

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Salvage rapid maxillary expansion for the relapse of maxillary transverse expansion after Le Fort I with parasagittal osteotomy

  • Lee, Hyun-Woo;Kim, Su-Jung;Kwon, Yong-Dae
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.41 no.2
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    • pp.97-101
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    • 2015
  • Maxillary transverse deficiency is one of the most common deformities among occlusal discrepancies. Typical surgical methods are segmental Le Fort I osteotomy and surgically-assisted rapid maxillary expansion (SARME). This patient underwent a parasagittal split with a Le Fort I osteotomy to correct transverse maxillary deficiency. During follow-up, early transverse relapse occurred and rapid maxillary expansion (RME) application with removal of the fixative plate on the constricted side was able to regain the dimension again. RME application may be appropriate salvage therapy for such a case.

Transverse permeability measurement of a circular braided preform in liquid composite molding

  • Chae, Hee-Sook;Song, Young-Seok;Youn, Jae-Ryoun
    • Korea-Australia Rheology Journal
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    • v.19 no.1
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    • pp.17-25
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    • 2007
  • In liquid composite molding (LCM), composites are produced by impregnation of a dry preform with liquid resin. The resin flow through the preform is usually described by Darcy's law and the permeability tensor must be obtained for filling analysis. While the resin flow in the thickness direction can be neglected for thin parts, the resin flow in the transverse direction is important for thicker parts. However, the transverse permeability of the preform has not been investigated frequently. In this study, the transverse permeability was measured experimentally for five different fiber preforms. In order to verify the experimental results, the measured transverse permeability was compared with numerical results. Five different fiber mats were used in this study: glass fiber woven fabric, aramid fiber woven fabric, glass fiber random mat, glass fiber braided preform, and glass/aramid hybrid braided preform. The anisotropic braided preforms were manufactured by using a three dimensional braiding machine. The pressure was measured at the inlet and outlet positions with pressure transducers.

Dynamic Modeling and Analysis for an Axially moving String (축방향 이송속도를 갖는 현의 모델링 및 진동해석)

  • 신창호;정진태;한창수
    • Journal of KSNVE
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    • v.10 no.5
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    • pp.838-842
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    • 2000
  • The vibration of an axially moving string is studied when the string has geometric non-linearity and translating acceleration. Based upon the von karman strain theory, the equations of motion are derived considering the longitudinal and transverse deflection. The equation for the longitudinal vibration is linear and uncoupled, while the equation for the transverse vibration is non-linear and coupled between the longitudinal and transverse deflections. These equations are discretized by using the Galerkin approximation after they are transformed into the variational equations, i.e. the weak forms so that the admissible and comparison functions can be used for the bases of the longitudinal and transverse deflections respectively. With the discretized nonlinear equations, the time responses are investigated by using the generalized-$\alpha$ method.

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Characteristic analysis of transverse flux machine by analytical way (해석적 방법에 의한 횡자속형 전동기 특성 분석)

  • Chang, Jung-Hwan;Kim, Ji-Won;Kang, Do-Hyun;Viorel, I.A.
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.645-646
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    • 2006
  • 횡자속형 전동기는 3차원적인 자속의 흐름 때문에 기존의 전동기와는 달리 2차원적인 수치해석이 용이하지 않으며 특성 분석에 상대적으로 많은 계산 시간을 필요로 한다. 본 논문에서는 퍼미언스법과 철심의 포화를 고려하기 위한 최소한의 유한 요소 해석을 결합하여 횡자속형 전동기의 특성을 분석하기 위한 해석적인 방법을 제시하고자 한다. 본 논문에서 제시하고 있는 추력 및 쇄교 자속량을 표현하는 수식들은 향후 전동기 제어 알고리즘 개발이나 최적 설계에 응용될 수 있을 것으로 판단된다.

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An efficient high-order warping theory for laminated plates

  • Deng, Zhongmin;Huang, Chuanyue
    • Structural Engineering and Mechanics
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    • v.22 no.5
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    • pp.599-611
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    • 2006
  • The theory with hierarchical warping functions had been used to analyze composite thin-walled structure, laminated beam and had good results. In the present paper, a series of hierarchical warping functions are developed to analyze the cylindrical bending problems of composite lamina. These warping functions which refine through-the-thickness variation of displacements were composed of basic and corrective functions by taking into account of anisotropic, material discontinues, and transverse shear and normal strain. Then the hierarchical finite element method was used to form a numerical algorithm. The distribution of the displacements, in-plane stresses, transverse shear stresses and transverse normal stress for composite laminate were analyzed with the present model. The results show that the present model has precise mechanical response compared with the first deformation transverse theory and the corrective order affects the accuracy of result.

A Case Report of Acute Transverse Myelitis Managed in Oriental Medical Hospital (한방치료만을 시행한 급성 횡단성 척수염 2례에 대한 증례보고)

  • Lee, Myeong-Jong;Song, Mi-Young
    • The Journal of Churna Manual Medicine for Spine and Nerves
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    • v.1 no.1
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    • pp.15-25
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    • 2006
  • Objectives : This report is about a case of a patient who improvement in general condition, Infection and bowel after and urinary dysfunction. Methods : We diagnosed that symptoms as Wejeung(?證), and employed oriental medical treatments, herb medication, acupuncture, electro-acupuncture, moxibustion and physical therapy. Results : In the first case, neurologic impairment was aggravated despite of 15 days of treatments. In the second case, motor and defecation was improved. Conclusions : There is no specific treatment for acute transverse myelitis in the Western medicine. Several case reports revealed clinical improvement of subacute or chronic transverse myelitis in the oriental medicine. We anticipated that the researches regarding treatment for acute transverse myelitis in the oriental medicine will be encouraged in the near future.

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Evaluation of the delamination strengths in differently processed practical Ag-stabilized REBCO CC tapes under transverse loading

  • Diaz, Mark A.;Shin, Hyung-Seop;Ha, Hongsoo;Oh, Sang-Soo
    • Progress in Superconductivity and Cryogenics
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    • v.21 no.4
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    • pp.34-38
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    • 2019
  • Multilayered high-temperature superconductor coated conductor (CC) tapes are used in an extensive range of applications and are exposed to many stresses such as hoop stress, radial/transverse tensile stress under large Lorentz forces, and thermal stress while cooling if thermal expansion properties differ. Loads induced transversely at the tape surface inevitably create delamination phenomena in the multilayered CC tapes. Thus, delamination behaviors of CC tapes along the c-axis under transverse loading conditions, which can vary based on manufacturing process and constituent layers, must be characterized for applications. The anvil test method was used to mechanically investigate the delamination characteristics of various commercially available Ag-stabilized CC tapes at room temperature and 77 K, finding superior strength at the latter. The wide variations found depended on tape structure and fabrication technique. Fractographic morphologies of delaminated tapes supported the findings under transverse loading conditions.