• Title/Summary/Keyword: 편심도

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Fabrication of functionally customized fixed prosthesis in a hemimandibulectomy patient with fibular graft using double scan technique: A case report (비골이식을 받은 하악골절제술 환자에서 스캔중첩법을 이용한 기능적 고정성 보철물 제작: 증례 보고)

  • Win, Thaw Thaw;Lee, Du-Hyeong
    • The Journal of Korean Academy of Prosthodontics
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    • v.60 no.2
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    • pp.195-201
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    • 2022
  • Hemimandibulectomy and free fibular flap (FFF) in patients with squamous cell carcinoma could disturb the functional movement of the mandible. The muscular function in the sectioned side was compromised because of the incompetency of the muscle attachment to the mandible, leading to the unstable occlusal contact in the centric and eccentric occlusion. In this report, we present a case of a 63-year-old male who underwent cancer surgery and reconstruction with fibular graft, and he needed a fixed dental prosthesis to restore tooth loss in the anterior region. Occlusal contact change and instability were found according to the bite force in the centric relation and eccentric movement. This case report aimed to present the prosthetic procedure for fabricating the functionally optimized fixed prosthesis wherein the functionally generated path (FGP) technique and digital imaging method were applied to replicate mandibular movement and vertical dimension of the patient.

Finite Element Analysis of Slender Reinforced Concrete Columns Subjected to Eccentric Axial Loads and Elevated Temperature (고온과 편심 축하중을 받는 세장한 철근 콘크리트 기둥의 유한요소해석)

  • Lee, Jung-Hwan;Kim, Han-Soo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.35 no.3
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    • pp.159-166
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    • 2022
  • In this study, slender reinforced concrete columns subjected to high temperatures and eccentric axial loads are evaluated by finite element analysis employing Abaqus (a finite element analysis program). Subsequently, the analysis results are compared and assessed. The sequentially coupled thermal stress analysis provided by Abaqus was employed to reflect the condition of an axially loaded column exposed to fire. First, heat transfer analysis was performed on the column cross-section. After verifying the results, another analysis was conducted: the cross-section was transformed into a three-dimensional element and then structural analyzed. In the analysis process, the column was modeled by accounting for the effects of tension stiffening and initial imperfection that could affect convergence and accuracy. The analysis results were compared with 74 experimental records, and an average error of 6% was observed based on the fire exposure and resistance. The foregoing indicates that the fire resistance performance of reinforced concrete columns can be predicted through finite element analysis.

Development of Analysis Program for PSC Beams with Unbonded External Tendons (외부 비부착 강선을 갖는 PSC보의 해석프로그램 개발)

  • Kwak, Hyo-Gyoung;Son, Je-Kuk;Kim, Sun-Yong;Park, Young-Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.2A
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    • pp.247-260
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    • 2006
  • In this paper, an analytical method which can describe the structural behavior of prestressed concrete (PSC) bridges reinforced with the unbonded external tendon is developed. Since the unbonded external tendon is directly installed to the deviators while maintaining a straight configuration, it has a different deformation field from that of concrete and accompanies the secondary effect caused by the change of the primary eccentricity between concrete and external tendon. In advance, the friction slip at the deviators is also taken into consideration on the basis of the force equilibrium between the friction force and the driving force. Through correlation studies between experimental data and analytical results, it is verified that the proposed numerical model can effectively predict the structural behavior of PSC beam bridges with comparative precision.

Analysis of a Magnetic Field According to Eccentricity in Brushless DC M01 (BLDC 모터에서의 편심에 따른 자계특성 해석)

  • Jang, S.M.;Yoon, I.K.;Lee, S.H.;Choi, S.K.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.706-708
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    • 2002
  • Vibration, giving rise to acoustical noise, is an important index of motor performance. The unbalance force due to rotor eccentricity caused by manufacturing imprecision or bearing defects is one possible source of excitation to vibration. With the advent of new high-energy magnetic material together with high precision motor applications, magnetic sources of vibration are becoming more serious. This paper introduces two types of high-speed slotless permanent magnet (PM) machine for electro-mechanical battery and investigates unbalance force due to static eccentricity with finite element method.

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An Experimental Study on the Performance of Mini-Diaphragm Pump (소형 다이아프램 펌프의 성능 특성에 관한 실험적 연구)

  • Seo, Hyeon-Seok;Kim, Tae-An;Kim, Youn-Jea
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.3134-3138
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    • 2007
  • The objective of this paper is to elucidate the characteristic performance of the mini-vacuum pump with various heights of eccentric shaft. The mini-diaphragm pump is composed of DC motor, eccentric shaft and diaphragm and it is operated by PCB panel. The height of eccentric shaft is changed that controls the quantities of air flow to improve the performance of vacuum pressure. This device is manufactured in order to embody the vacuum pressure with 200 mmHg. The heights of eccentric shaft which is used in present experiment are located in the range from 3 mm to 5.5 mm. The vacuum pressure distributions with each height of eccentric shaft was measured and the results were graphically depicted.

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Analysis of Electromagnetic Vibration Sources in 100kW Interior Permanent Magnet Motor for Ship Anti-heeling Pump Considering Eccentricity (선박 자세안정성 향상을 위한 Anti-heeling Pump용 100kW급 IPM 전동기의 편심에 의한 전자기 가진력 분석)

  • Lee, Sun-Kwon;Kang, Gyu-Hong;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2230-2235
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    • 2011
  • The purpose of this paper is to provide the unbalanced magnetic force and vibration mode comparison between two large interior permanent magnet machines(IPM) with different pole-slot combination considering stator and rotor eccentricity. Due to the punching tolerance, the mixed eccentricity of air-gap is inevitable. It will generate the asymmetric magnetic flux density in air-gap, which makes the unbalanced magnetic pull and vibration. The study is focused on the unbalanced magnetic force and their harmonic components according to eccentricity conditions such as static, dynamic and mixed. When the high vibration is produced especially resonance, the obtained results provide clues what eccentricity condition occurs in the machine.

Stiffness and Load Matrix for Finite Parallelogrammic Plate Bending Element (평행사변형 유한요소의 강성 매트릭스와 하중 매트릭스)

  • 조병완
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1989.04a
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    • pp.28-32
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    • 1989
  • In the recent years, parallelogrammic shape structures were often introduced in the Civil Engineering. Especially parallelogrammic shape highway slabs, which were used in the portions of Interstate-75, U.S.A., were a unique one to result in only one wheel crossing the joint at any one time. In this reserch, major efforts were made to provide an appropriate subroutine program and to study an analytical behavior of paralleloqrammic plate bending element by developing the stiffness and load matrices.

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Performance Evaluation of Outrigger System in Tall Buildings with Eccentric Core (편심코어를 가진 초고층 건축물의 아웃리거 시스템 성능 평가)

  • Park, Ji-Hyeong;Kim, Tae-Ho;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.561-566
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    • 2009
  • The outrigger system with a core is widely used for lateral load resisting system of tall building. Recently, structural systems in tall building are adopted to eccentric core and offset outrigger or one-armed outrigger system by trends in planning buildings of irregular type. Therefore, the performance of outrigger system with eccentric core in tall building is evaluated by 50-stories examples which are analyzed for variables such as layout of core and outrigger, arm length of outrigger and depth of outrigger and belt wall.

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Load Carrying Capacities of Cold Formed Steel Structural Columns subject to Combined Axial Load and Bending Moment (압축과 휨의 조합하중을 받는 냉간성형강 기둥의 내력성능)

  • Shin, Tae Song
    • Journal of Korean Society of Steel Construction
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    • v.17 no.1 s.74
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    • pp.83-92
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    • 2005
  • This paper is to evaluate the load carrying capacities of cold-formed steel columns subject to combined axial load and bending moment. A combined strength experiment is carried out using full-scale 24 specimens of lipped channel section with embossment in web. An eccentric axial load is applied in varying member-length and eccentric distance which produces an end-moment of the column. The predictions of the AISI specification and the Eurocode are compared with the experimental results, and it is shown that all of these codes are reasonable on the whole in relation to the experimental results.

Characteristics Analysis on the Effects of Rotor Eccentricity in Squirrel-cage Induction Motor (회전자 편심을 고려한 농형 유도전동기의 특성해석)

  • Kim, Mi-Jung;Kim, Byong-Kuk;Jo, Won-Young;Cho, Yun-Hyun;Hwang, Don-Ha;Kang, Dong-Sik
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.188-190
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    • 2006
  • This paper describes the effects of air gap eccentricity in induction machines. Asymmetric electro-magnetic force caused by the frictional worn bearing, rotor misalignment and unbalanced rotor etc. generates an asymmetrical operation, vibration and electro-magnetic noise. The need for detection of these rotor eccentricities has pushed the development of monitoring methods with increasing sensitivity and noise immunity. In this paper, we focus on investigating the asymmetrical operation considering of unbalanced magnetic force in squirrel-cage induction motor with 380 [V], 7.5 [kW], 4P, 1,768 [rpm]. The effects of the rotor eccentricity, magnetic force are investigated by finite element method (FEM).

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