• 센서학회지
• /
• 제26권6호
• /
• pp.432-437
• /
• 2017

As 4.0 industry has been developed, research on a self-driving car technology and related parts of an automobile has been highly investigated recently. Particularly, a TAS(Torque Angle Sensor) module on steering wheel system has been considered as a key technology because of its precise angle, torque detection and high speed signal processing. The environmental assessment is generally required on the TAS module to examine high resolution of angle/torque detection. In the case of existing TAS module, angle detection errors has been occurred by back-lash on main and sub gear in addition to complicated structure caused by gears. In this paper, a structure of the TAS module, which minimizes the numbers of components and angle detection errors on the module compared with the existing TAS module, for vehicle steering system based on a Multi-track Encoder has been proposed. Also, angle detection signal processing board, and key technology of the TAS module were fabricated and evaluated. As a result of the experiments, we confirmed an excellent performance of the fabricated signal processing board for angle detection and an applicability of the fabricated angle detection board on the TAS module of vehicles by the environmental assessment an automobile standard.

• ETRI Journal
• /
• 제31권4호
• /
• pp.351-356
• /
• 2009

We present a simple semiconductor process to fabricate nanogap arrays for application in molecular electronics and nano-bio electronics using a combination of freestanding silicon nanowires and angle evaporation. The gap distance is modulated using the height of the silicon dioxide, the width of the Si nanowires, and the evaporation angle. In addition, we fabricate and apply the nanogap arrays in single-electron transistors using DNA-linked Au nanoparticles for the detection of DNA hybridization.

• ETRI Journal
• /
• 제43권1호
• /
• pp.120-132
• /
• 2021

A frequency diverse array (FDA) multiple-input multiple-output (MIMO) radar employs a small frequency increment across transmit elements to produce an angle-range-dependent beampattern for target angle and range detection. The joint angle and range estimation problem is a trilinear model. The traditional trilinear alternating least square (TALS) algorithm involves high computational load due to excessive iterations. We propose a fast-convergence trilinear decomposition (FC-TD) algorithm to jointly estimate FDA-MIMO radar target angle and range. We first use a propagator method to obtain coarse angle and range estimates in the data domain. Next, the coarse estimates are used as initialized parameters instead of the traditional TALS algorithm random initialization to reduce iterations and accelerate convergence. Finally, fine angle and range estimates are derived and automatically paired. Compared to the traditional TALS algorithm, the proposed FC-TD algorithm has lower computational complexity with no estimation performance degradation. Moreover, Cramer-Rao bounds are presented and simulation results are provided to validate the proposed FC-TD algorithm effectiveness.

• 접착 및 계면
• /
• 제15권2호
• /
• pp.57-62
• /
• 2014

피타고라스 원리를 이용하면 특정 도형이 보유하고 있는 각도에 대한 계산이 용이해진다. 정적 접촉각 평가방법을 이용할 경우 용액과 고체 물체간의 접촉각의 수치 계산이 가장 중요한 부분이다. 용액과 고체 표면이 이루는 각도 측정을 용이하게 하기 위해서 접촉각을 계산하는 방법을 규격화하는 방법과 접촉각 평가에 따른 실험적 변수 최소화 조건을 마련하였다. 접촉각 실험을 위한 용액의 직경에 따른 접촉각의 각도 계산 오차를 분석하고, 최적의 물방울 직경은 1 mm임을 확인하였다. 피타고라스 원리를 이용한 접촉각 측정방법은 전진각과 후진각을 확인하는데 사용할 수 있으며, 소수성 및 친수성 표면을 분석하는데 적용이 가능하였다. 궁극적으로 일반적인 접선 긋기를 통한 각도 계산 결과보다 피타고라스 원리를 이용하여 접촉각 각도 계산을 실시할 경우 비교적 정확한 접촉각 계산 결과를 확인할 수 있었다.

• ETRI Journal
• /
• 제38권1호
• /
• pp.195-205
• /
• 2016

This paper presents a novel follicular unit (FU) classification method based on an angle variation of a boundary vector according to the number of hairs in several FU images. The recently developed robotic FU harvest system, ARTAS, classifies through digital imaging the FU type based on the number of hairs with defects in the contour and outline profile of the FU of interest. However, this method has a drawback in that the FU classification is inaccurate because it causes unintended defects in the outline profile of the FU. To overcome this drawback, the proposed method classifies the FU's type by the number of variation points that are calculated using an angle variation a boundary vector. The experimental results show that the proposed method is robust and accurate for various FU shapes, compared to the contour-outline profile FU classification method of the ARTAS system.

• 대한치과보철학회지
• /
• 제49권1호
• /
• pp.22-28
• /
• 2011

연구 목적: 지르코니아 보철물을 위한 치아 형성이 실제 임상에서 어떻게 이루어지는지에 대해 조사하고 향후 치아 형성에 대한 교육 자료 및 추가 연구의 기초 자료로 활용하고자 한다. 연구 재료 및 방법: 지르코니아 치관 제작을 위해 milling center에 보내진 모형을 조사하여 Lava CAD/CAM System으로 스캔 한 후 'ImageJ' 프로그램 상에서 측정하여, 이를 비교 분석하였다. 각 치아마다 근원심면과 협설면에서의 축면 경사각을 측정하였다. 또한, 견치를 제외한 전치에서 절단연 0.4 mm 하방 부위의 bucco-lingual diameter 측정하였다. 결과 및 결론: 실험군 내에서 지르코니아 전부도재관을 위한 지대치의 축면 경사각은 $18.67^{\circ}$로 문헌에서 추천하는 각도 보다 크게 나타났다. 지르코니아 완전도재관의 지대치 형성 시 축면 경사각은 협설과 근원심면, 악궁 내 위치에 따라 차이가 있었다. Peak 0.4의 평균값은 1.18 mm로 밀링버의 최소직경을 고려한 요구조건인 0.8 mm 보다 큰 값으로 나타났다. 그러나 선각 부위 rounding 에 관한 추가적인 연구가 필요할 것으로 생각된다.

• 융합신호처리학회논문지
• /
• 제10권2호
• /
• pp.146-150
• /
• 2009

An Intelligent active roll angle controller design algorithm is discussed. The detailed mathematical formulation and analysis are discussed, and then modeling and design method for active roll angle controller are presented. This paper proposes a design method based upon intelligent robust controller design algorithm to control actively roll angle for improving cornering performance problems. The intelligent robust controller is designed for steady speed driving vehicle system model with representation of steering angle and yaw angular velocity parameters for cornering stability. And the detailed formulation and analysis for the objective vehicle system are investigated.

• 한국운동역학회지
• /
• 제31권1호
• /
• pp.44-49
• /
• 2021

Objective: The purpose of this study was to analyze kinematic variables according to ground slope angle during golf putting. Method: 26 collegiate golfers (age: 22.54±2.15 kg, height: 174.64±6.07 cm, weight: 71.35±9.27 kg, handicap: 5.11±4.50) were participated, and 8 motion capture cameras (250 Hz), Nexus, and Kwon3DXP software were used to collect data. It was performed repeated measures ANOVA and Bonferroni adjustment. Alpha set at .05. Results: Body alignments were not significantly different at address. Putter head trajectory and loft angle were significantly different, and AP direction of acceleration of putter head was significantly different. However, ML and SI direction of acceleration of putter head were not significantly different. Conclusion: Therefore, it was identified that ground slope angle was affected the kinematic variables during putting, and it will be performed that correlation analysis between putting success rate and kinematic variables according to ground slope angle during golf putting.

• 한국산업융합학회 논문집
• /
• 제25권5호
• /
• pp.827-833
• /
• 2022

In this study, the prediction of the bending angle for the 350 A bellows-type expansion joints and the structural stability according to the load were determined. The stability of the 2km piping system was predicted by applying the allowable bending angle of the expansion pipe joint obtained from the analysis. The maximum bending angle was calculated through bending analysis of the bellows-type expansion joints, and the maximum bending angle by numerical calculation was about 1.8°, and the maximum bending angle of the bellows obtained by comparing the allowable strength of the material was about 0. 22°. This angle was very stable compared to the allowable bending angle (3°) of the expansion pipe joint regulation. By applying the maximum bending angle, the allowable maximum deflection of the 2 km pipe was about 3.8 m. When the seismic load was considered using regression analysis, the maximum deflection of the 2km pipe was about 142.3mm, and it was confirmed that the bellows-type expansion joints and the deflection were stable compared to the allowable maximum deflection of the pipe system. These research results are expected to present design and analysis guidelines for the construction of piping and the development of bellows systems, and to be used as basic data for systematic research.

• 한국융합학회논문지
• /
• 제5권4호
• /
• pp.61-68
• /
• 2014

본 연구는 schroth 운동(3차원적 융합운동)이 폐기능과 Cobb's angle, scoliometer angle과 척추세움근의 근활성도에 미치는 영향을 알아보기 위해 실시되었다. Cobb's angle $10^{\circ}$ 이상의 특발성 척추측만증을 가지고 있는 학생 40명을 대상으로 각각 20명의 슈로스운동군과 전통적인 치료군으로 나누어 총 8주간 주 3회, 회당 60분의 운동을 실시하였다. 8주간의 Schroth 운동을 적용한 그룹에서는 Cobb's angle과 갈비뼈 돌출부, 폐활량, 체간의 확장, 오른쪽 흉추부위의 활성도에 유의한 차이를 보였다. 8주간의 전통적인 측만증 운동을 실시한 그룹에서는 체간의 확장성에서 유의한 차이를 보였다. 본 연구의 결과를 통해 3차원적 접근법인 슈로스운동이 특발성 척추측만증 환자의 흉추측만각도의 감소와 폐기능의 향상을 목적으로 한 중재기법으로 기존의 운동방법보다 효과적이라고 할 수 있다. 따라서 차후의 연구에서는 척추측만증이 장기간의 관리와 치료가 필요한 질환임을 이해하고 이에 따라 체계적인 자세관리와 3차원적 융합운동 프로그램의 적용이 필요하다고 사료된다.