• JSTS:Journal of Semiconductor Technology and Science
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• 제15권4호
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• pp.462-470
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• 2015

In this study, we analyze the impacts of the trapezoidal fin shape of a double-gate FinFET on the electrical characteristics of circuits. The trapezoidal nature of a fin body is generated by varying the angle of the sidewall of the FinFET. A technology computer-aided-design (TCAD) simulation shows that the on-state current increases, and the capacitance becomes larger, as the bottom fin width increases. Several circuit performance metrics for both digital and analog circuits, such as the fan-out 4 (FO4) delay, ring oscillator (RO) frequency, and cut-off frequency, are evaluated with mixed-mode simulations using the 3D TCAD tool. The trapezoidal nature of the FinFET results in different effects on the driving current and gate capacitance. As a result, the propagation delay of an inverter decreases as the angle increases because of the higher on-current, and the FO4 speed and RO frequency increase as the angle increases but decrease for wider angles because of the higher impact on the capacitance rather than the driving strength. Finally, the simulation reveals that the trapezoidal angle range from $10^{\circ}$ to $20^{\circ}$ is a good tradeoff between larger on-current and higher capacitance for an optimum trapezoidal FinFET shape.

• 한국컴퓨터정보학회논문지
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• 제26권4호
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• pp.143-147
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• 2021

본 연구의 목적은 정상 범위보다 큰 명치각을 가진 대상자들에게 가슴벨트 적용이 척추 안정성에 어떠한 영향을 미치는지에 대하여 알아보고자 하였다. 정상 범위보다 큰 명치각을 가진 총 15 명의 대상자가 본 연구에 참여했으며 가슴벨트 적용 유-무의 조건에서 능동적 두 다리 내리기와 능동적 한 다리 올리기가 수행되었다. 가슴 벨트 적용 여부에 따라 수행 된 두 가지 척추 안정성 테스트 (능동적 두 다리 내리기와 능동적 한 다리 올리기)는 각 조건 간에 유의 한 차이를 보였다. 본 연구의 결과에 따르면, 가슴벨트 적용은 비정상적으로 증가된 명치각으로 인해 척추 또는 몸통 불안정성을 가진 대상자에게 척추를 안정화 시켜줄 수 있는 효과적인 치료적 방법으로 여겨진다.

• 한국방사선학회논문지
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• 제11권5호
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• pp.313-319
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• 2017

본 연구의 목적은 한국인의 시신경구멍의 이중각도를 확인하여 Rhese법에 적용하는 것이다. 먼저 3차원 CT의 MPR 기법을 이용하여 축상면 영상에서 좌측 안구와 정중시상면 사이의 각도를 측정하였다. 두 번째는 MPR 영상의 시상면에서 좌측 안구의 시신경구멍과 OML 사이의 각도를 측정하였다. 시신경과 정중시 상면 사이의 각도는 평균 $39.9{\pm}4.63^{\circ}$ 였고, 이는 Rhese 방법으로 제시해 오던 $53^{\circ}$ 와 달랐음을 확인하였다(p<0.05). 시신경구멍과 OML 사이의 각도는 $40.8{\pm}6.6^{\circ}$ 였다. 결론적으로 본 연구는 현행 교과서에서 제안 된 Rhese 방법의 표준이 한국인에게 적용하기 어려움을 의미한다. 따라서 다양한 일반촬영법에서 한국 표준의 각도의 연구가 필요하고 이에 본 연구가 기초 자료로 활용될 것이라 사료된다.

• 대한방사선기술학회지:방사선기술과학
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• 제43권6호
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• pp.489-494
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• 2020

The Law method is observing the temporal bone. There are two types of methods: the double angle method, which manipulates the center ray angle of the tube twice, and the single angle method, which manipulates once. The purpose is to increase the reproducibility of the image by making vertical incidence by making an assistive device using a 3D printer. Two assistive devices with a wedge-shaped 8.5 × 10 × 2.3 cm, an inclined surface of 7.5 cm, and an inclination angle of 15° were fabricated. Assistive devices can be combined with each other in the form of grooves, and PLA (Poly Lactic Acid) is used as a material. In the first experiment, 10 examiners operated the tube 15° in the caudad direction and 15° in the anterior direction, and measured it with a protractor to conduct a reproducibility experiment. Second, two examiners acquired vertically incidence images using the existing law method and assistive devices, and measured the distance between each measurement point to evaluate the reproducibility. The tube center ray angle reproducibility experiment was not statistically significant, but the angle difference was up to 9° between examiners. The reproducibility experiment of radiographic images was not statistically significant with the conventional method, and the method using an assistive device was statistically significant. Therefore, regardless of skill level, an image capable of securing reproducibility, which is the advantage of vertical incidence, could be obtained.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2009년도 Korea Superconductivity Society Meeting 2009
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• pp.75-75
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• 2009

• 대한전기학회논문지:전력기술부문A
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• 제54권3호
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• pp.133-138
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• 2005

This paper presents a characteristics of horizontal swing angle in V type suspension string sets for 765kV T/L. The design of V type suspension string set does not differ from that of general string set for general towers, but it prevents instabilities from swing motion by the horizontal angle and by the wind pressure. We were designed specially 6 conductor yoke, arcing horn and earth horn. And we were decided to 550mm for a distance of strings. We were carried out characteristics of horizontal swing test and movement of mass center test for V-string sets of 400kN single, 300kN double and 400kN double. This products will be used for 765kV T/L of 1 circuit in suspension towers.

• 원예과학기술지
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• 제30권1호
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• pp.93-96
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• 2012

1999년 'Bristol Fairy' 유래의 결실되는 아조변이체인 'Gyp99' 계통을 선발하였고, 계통의 실생 중 선발을 거듭한 결과, 특성이 우수한 'Gyp08-63' 계통을 선발하여 2년간 특성검정을 통해 'Double Shine' 품종을 육성하였다. 'Double Shine' 품종의 초형은 개장형이고, 잎 모양은 둥근 피침형, 소화는 꽃잎수가 많고 암술이 2개인 밝은 백색 겹꽃으로 꽃잎은 주걱형, 꽃받침 모양은 컵형인 식물체 고유 특성을 가졌다. 또한 화경이 단단하고, 흰가루병과 충해에도 강한 편이다. 여름절화 작형에서 'Double Shine' 개화는 대조품종인 'Bristol Fairy'보다 16일 늦고 절간장과 화경장이 길었으며, 측지 분화가 많고 줄기가 굵고 분지각은 작았고, 기형화 발생이 없었다.

• 한국운동역학회지
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• 제14권3호
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• pp.17-35
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• 2004

The purpose of this study is to explain developmental process of gait via angle-angle diagram to understand how coordinated relationships and control change with age. Twenty four female children, from one to five years of age were the test subjects for this study, and their results were compared to a control group consisting of twenty one adult females. The Vicon 370 CCD camera, VCR, video timer, monitor, and audio visual mixer was utilized to graph the gait cycle for all test subjects. Both coordinated Intra-limb relationships, and range of motion and timing according to quadrant were explained through the angle angle diagram. Movement in the sagittal plane showed both coordinated relationships and control earlier than movement in the coronal or transverse plane. In the sagittal plane, hip and Knee coordinated relationships developed first (from one year of age.) Coordinated relationships in the Knee and ankle and hip and ankle developed next, respectively. Both hip and ankle and knee and ankle development were inhibited by the inability of children to completely perform plantar flexion during the swing and initial double limb support phases. Children appeared to compensate for this by extending at their hip joint more than adults during the third phase, final double limb support. In many cases the angle angle diagram for children had a similar shape as adult's angle angle diagram. This shows that children can coordinate their movements at an early age. However, the magnitudes and timing of children's angle angle diagrams still varied greatly from adults, even at five years of age. This indicates that even at this age, children still do not possess full control of their movements.

• Nuclear Engineering and Technology
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• 제56권1호
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• pp.78-91
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• 2024

Double steel plate concrete composite shear wall (SCSW) has been widely utilized in nuclear power plants and high-rise structures, and its shear connectors have a substantial impact on the seismic performance of SCSW. Therefore, in this study, the mechanical properties of SCSW with angle stiffening ribs as shear connections were parametrically examined for the reactor containment structure of nuclear power plants. The axial compression ratio of the SCSW, the spacing of the angle stiffening rib arrangement and the thickness of the angle stiffening rib steel plate were selected as the study parameters. Four finite element models were constructed by using the finite element program named ABAQUS to verify the experimental results of our team, and 13 finite element models were established to investigate the selected three parameters. Thus, the shear capacity, deformation capacity, ductility and energy dissipation capacity of SCSW were determined. The research results show that: compared with studs, using stiffened ribs as shear connectors can significantly enhance the mechanical properties of SCSW; When the axial compression ratio is 0.3-0.4, the seismic performance of SCSW can be maximized; with the lowering of stiffener gap, the shear bearing capacity is greatly enhanced, and when the gap is lowered to a specific distance, the shear bearing capacity has no major affect; in addition, increasing the thickness of stiffeners can significantly increase the shear capacity, ductility and energy dissipation capacity of SCSW. With the rise in the thickness of angle stiffening ribs, the improvement rate of each mechanical property index slows down. Finally, the shear bearing capacity calculation formula of SCSW with angle stiffening ribs as shear connectors is derived. The average error between the theoretical calculation formula and the finite element calculation results is 8% demonstrating that the theoretical formula is reliable. This study can provide reference for the design of SCSW.

• 한국강구조학회 논문집
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• 제23권5호
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• pp.595-606
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• 2011

본 연구는 기둥-보 접합부의 강성에 따른 철골 모멘트 골조의 동적특성의 차이를 파악하는데 목적이 있다. 6층의 철골 모멘트 골조를 설계하였으며, 접합부는 DWA (Double Web-Angle Connection), TSW (Top-and Seat-Angle Connection with Double Web-Angle), FEMA(SAC-Test Summary No.28, Specimen ID : UCSD-6) 접합부를 사용하였고, 완전강접합부의 동적거동특성과 상호 비교 검토하였다. 반강접 접합부의 회전강성은 Chen 과 Kishi 에 의해 제안된 3매개변수파워모델을 사용하여 구하였다. 접합부의 회전 강성을 보의 강성으로 나누어 상대강성으로 정의하여 사용하였다. 모든 골조에 대하여 비선형 정적해석(push over analysis), 반복하중 해석 및 시간이력해석을 수행하였다. 각 접합부의 강성에 따른 내진거동은 층간변위, 소성힌지 및 이력 에너지 분배의 항목별로 비교 분석하였다.