• 한국방사선학회논문지
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• 제15권5호
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• pp.585-590
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• 2021

손목 보조기(Wrist brace)는 손목 외상 환자들에게 사용이 되고 있다. 최근 맞춤형 손목 보조기를 3D 프린팅 기술을 활용하여 제작하는 많은 연구가 진행되고 있다. 이러한 3D 프린팅 맞춤형 보조기는 개인마다 다른 형태 반영, 통기성 확보 등의 다양한 요소를 반영할 수 있는 장점이 있다. 본 논문에서는 3D 프린팅 맞춤형 손목 보조기 제작 시 고려되어야 하는 벨크로 밴드 숫자와 위치가 보조기에 미치는 스트레스를 분석하였다. 맞춤형 보조기를 위해 CT 영상 기반으로 자동설계 소프트웨어(Reconeasy 3D, Seeann Solution)를 사용하여 뼈, 피부 영역 3D 모델링을 수행하였다. 3D 피부 영역을 기반으로, 각 치료 목적에 맞도록 손목 보조기 디자인을 적용하였다. 그리고, 보조기의 탄성을 위해 TPU 소재를 사용하여 FDM 방식 3D 프린터로 손목 보조기를 제작하였다. 맞춤형 3D 프린팅 손목 보조기의 벨크로 밴드의 숫자와 위치에 따른 효용성 평가를 위해 보조기의 스트레스 분포를 유한요소법(FEM)으로 분석하였다. 본 연구에서 수행한 손목 보조기 유한요소 해석을 통해 보조기의 스트레스 분포를 확인하였고 보조기 제작과 벨크로 밴드의 숫자와 위치를 확인할 수 있었다. 이러한 실험 결과는 환자에게 양질의 치료를 제공하는데 도움이 될 것이다.

• 한국전자통신학회논문지
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• 제18권5호
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• pp.835-840
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• 2023

2D FEM은 3D FEM에 비하여 모델 및 조건을 간소화하여 해석할 수 있다. 하지만 코일의 조건에 대하여는 실제 코일의 인입과 반출을 순차적으로 구성하여 해석 조건에 입력하는 경우가 많다. 본 논문은 다수의 슬롯을 가지더라도 하나의 FEM Coil로 구성한 등가 권선법을 적용하여 코일 조건의 단순화 및 해석 시간의 단축을 나타내고 권선형 마그네틱 기어에 적용하여 결과의 일치성을 보인다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권1호
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• pp.7-15
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• 2002

The paper proposes the characteristics analysis for a Transverse flux type Switched Reluctance Motor(TSRM) considering the nonlinear magnetic phenomena. To investigate the nonlinear parameters of magnetic equivalent circuit, the designed TSRM is analyzed by the 2D and 3D finite element method as functions of input current and angular displacement. On the base of FEM analysis results, the current, torque, back EMF and output power wave of TSRM are simulated from the motion equation by MATLAB/Simulink. The simulated performance characteristics for a 4-phase, 24-pole TSRM are verified by experimental results of a prototype TSRM.

• 한국산업융합학회 논문집
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• 제27권3호
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• pp.527-534
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• 2024

In this study, focuses on noise reduction between floors in the civil and architectural fields. Specifically, it investigates the application of newly developed 3D Textile to slabs to reduce interfloor noise. The effect of 3D Textile, through performance analysis via experiments and noise analysis using finite element method, provides a new understanding of noise reduction technology, and is expected to contribute to the improvement of living quality in residential spaces.

• 한국임상수의학회지
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• 제40권4호
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• pp.268-275
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• 2023

In this paper, we designed 3D-printed orthopedic splint models for patient-specific external coaptation on fracture healing and analyzed the stability of the models through finite element method (FEM) analysis under compressive load conditions. Polylactic acid (PLA) and acrylonitrile-butadiene-styrene (ABS) based 3D splint models of the thicknesses 1, 3, 5 and 7 mm were designed, and Peak von Mises stress (PVMS) and maximum displacement (MD) of the models were analyzed by FEM under compressive loads of 50, 100, 150, and 200 N. The FEM results indicated that PVMS and MD values, regardless of material, had a negative correlation with the thickness of the models and a positive correlation with the compressive load. There was a risk of splint deformation under conditions more extreme than 100 N with 5 mm thickness. For successful clinical application of 3D-printed orthopedic splints in veterinary medicine, it is recommended that the splint should be produced not less than 5 mm thickness. Also, it is expected to be stable when the splint is applied to situations with a compressive load of 100 N or less. There is an advantage of overcoming the limitations of the existing bandage method through 3D-printing technology as well as verifying the stability through 3D modeling before application. Such 3D printing technology will be widely used in veterinary medicine and various fields as well as orthopedics.

• Journal of Electrical Engineering and Technology
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• 제5권3호
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• pp.431-434
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• 2010

This paper presents the torque calculation method of a permanent magnet spherical motor. To calculate using the finite element method (FEM), three-dimensional (3D) FEM must be used. However, since the method requires excessive time and memory, an easier torque calculation method is hereby presented. In the proposed method, it is very important to obtain the approximation function of the torque profile curve. We present the approximation method of the torque profile curve and show that the torque calculation result can approximate the torque obtained by 3-D FEM.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2005년도 춘계학술대회 논문집
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• pp.467-470
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• 2005

There are about 10 motors for tile actuator of the automation system in an auto-mobile recently. The performance of the motor-case is much related to the noise and the vibration of an auto-mobile Multi-Forming process is so much the better than existing deep-drawing or Multi-step forming by press by less cost, installation and staff. But there isn't the specific and general process design, so we aren't good at competition. So in the first step, I want to study about the core design for the multi-forming process. We can access by the elasto-plastic theory and the finite element method, and we use a commercial package of the Deform-2D and, Deform-3D which is based on three-dimensional elasto-plastic finite element, evaluated propriety oi the package. The evaluation of the package propriety was simulated by simple bending example. It was found the elasto-plastic theory was mostly in agreement with the simulation. We proposed that three type of section for the core and analyzed by finite element method (Deform-2D). We can get the best result with the ellipse type core. Then we apply the result of the preceding analysis to the finite element method (Deform-3D). In 3D-finite element analysis, we can get the result of 8/100mm-roundness. This result can help the improvement of the multi-forming process.

• Steel and Composite Structures
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• 제12권3호
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• pp.249-260
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• 2012

In this study, stress and deflection behaviours of T-type welding joint applied to HE200M steel beam and column were investigated in finite element method (FEM) under different distributed loads. In the 3D-FEM modelling, glue option was used to contact between steel materials and weld nuggets. Geometrical model was designed as 3-dimensional solid in ANSYS software program. After that, homogeneous, linear and isotropic properties were used to design to materials of model. Solid-92 having 3-dimensional, 4 faced and 10-noded was selected as element type. In consequence of mesh operation, elements of 13285 and nodes of 28086 were occurred. Load distribution was applied to top surface of steel beam to determine behaviours of stress and deflection. As a result of FEM analysis applied with the loads of 55,000 N, 110,000 N and 220,000 N, maximum values were obtained as 116 N/$mm^2$, 232 N/$mm^2$ and 465 N/$mm^2$ for stress and obtainedas 1,083 mm, 2,166 mm and 4.332 mm for deflection, respectively. When modelling results and classical calculation values were compared, it was obtained difference of 10 % for stress values and 2.5% for deflection values.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.670_671
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• 2009

This paper presents a optimum design process for static torque characteristics of the Claw-Poles PM Stepping Motor(CPSM). Since the shape of CPSM changes along with axial direction, CPSM should only be analyzed by 3D-FEM. But 3D-FEM needs too much computation time and computer resources. Therefore, it is essential to reduce the number of 3D-FEM analysis models. In this paper, two design factors which affect the static torque characteristics of CPSM were selected. Optimum design process was able to make progress by using Pattern Search Algorithm and 3D-FEM. Finally, optimized model was compared with a conventional model.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권10호
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• pp.501-506
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• 2003

A Superconducting Rotary Machine (SRM) is characterized by an air-cored machine with its rotor iron and stator iron teeth removed. For this reason, the SRM is featured by 3D magnetic flux distribution, which decreases in the direction of axis. Therefore, 3D magnetic field analysis method is required to know about characteristic of magnetic field distribution of SRM. In this paper, 3D flux distribution of SRM is calculated by analytical method. The magnetic field distribution of the field coils is calculated by Biot-Savart equation. The magnetic core is represented by magnetic surface polarities. This paper describes the combined use of above methods for the total field computation, and compares results of analytical method and 3D FEM(Finite Element Method).