• Journal of applied mathematics & informatics
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• 제26권1_2호
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• pp.45-60
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• 2008

Here we consider the evaluation of the the dynamic component of the second order force due to wave diffraction by a circular cylinder analytically and numerically. The cylinder is fixed, vertical, surface piercing in water of finite uniform depth. The formulation of the wave-structure interaction is based on the assumption of a homogeneous, ideal, incompressible, and inviscid fluid. The nonlinearity in the wave-structure interaction problem arises from the free surface boundary conditions, namely, dynamic and kinematic free surface boundary conditions. We expand the velocity potential and free surface elevation functions in terms of a small parameter and then consider the second order diffraction problem. After deriving the pressure using Bernoulli's equation, we obtain the analytical expression for the dynamic component of the second order force on the cylinder by integrating the pressure over the wetted surface. The computation of the dynamic force component requires only the first order velocity potential. Numerical results for the dynamic force component are presented.

• 한국실내디자인학회논문집
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• 제24권4호
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• pp.43-50
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• 2015

In lighting design and lighting in the light of how the physical space rather than the amount of light metering is implemented in the same space as horizontal illuminance and luminance study of the spatial analysis as a basis for improving the quality of scientific and cognitive aspects analyzed the vertical component of the light. Vertical component of the light and the ability to interpret the information space can be secured more easily sense the brightness of a small area compared to the horizontal components of electrical energy, due to the contrast between the dark and the surrounding induce customers to public facilities or commercial space The pedestrian aids to facilitate the determination of the copper. In addition, to secure the brightness of the overall sense of space allows to have a sense of comfort to lower the tension of the space. The vertical component of light also has a deep relationship to improving the quality of light in electrical energy savings increase the accessibility of space, space, nightscape in the humanities also contribute to environmental and looking for one trillion people in the city in terms of cultural development and identity There.

• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1237-1251
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• 2016

Although the horizontal component of an earthquake response can be significantly reduced through the use of conventional seismic isolators, the vertical component of excitation is still transmitted directly into the structure. Records from instrumented structures, and some recent tests and analyses have actually seen increases in vertical responses in base isolated structures under the combined effects of horizontal and vertical ground motions. This issue becomes a great concern to facilities such as a Nuclear Power Plants (NPP), with specialized equipment and machinery that is not only expensive, but critical to safe operation. As such, there is considerable interest worldwide in vertical and three-dimensional (3D) isolation systems. This paper examines several vertical and 3D isolation systems that have been proposed and their potential application to modern nuclear facilities. In particular, a series of case study analyses of a modern NPP model are performed to examine the benefits and challenges associated with 3D isolation compared with horizontal isolation. It was found that compared with the general horizontal isolators, isolators that have vertical frequencies of no more than 3 Hz can effectively reduce the vertical in-structure responses for the studied NPP model. Among the studied cases, the case that has a vertical isolation frequency of 3 Hz is the one that can keep the horizontal period of the isolators as the first period while having the most flexible vertical isolator properties. When the vertical frequency of isolators reduces to 1 Hz, the rocking effect is obvious and rocking restraining devices are necessary.

• 구강회복응용과학지
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• 제34권1호
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• pp.10-16
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• 2018

목적: 골격성 고정원의 사용으로 고정원이 보강된 Pendulum 장치가 환자의 두개 안면 요소의 수직적인 부분에 미치는 영향을 분석하고자 하였다. 연구 재료 및 방법: 골격성 고정원과, pendulum을 이용하여 비발치 치료를 시행한 환자 중, 발산형 안모(SN-MP > $37^{\circ}$)와 중간형 안모($29^{\circ}$ < SN-MP < $37^{\circ}$) 각각 10명씩 분류하여 치료의 단기적 효과에 대해 분석하였다. 결과 및 결론: 골격 형태에 따른 차이로 발산형 안모군(HG)은 구치부 후방이동과 관련하여 하악 전치의 순측 경사가 유의하게 나타났다(P < 0.05). 중간형 안모군(MG)은 구치부의 유의한 이동만 나타났다(P < 0.05). 전치의 순측 이동은 유의성이 없었다. 본 논문에서 Pendulum 장치는 수직적인 안모 형태에 유의한 영향을 주지 않으며, 악화시키지 않았다.

• 한국운동역학회지
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• 제17권2호
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• pp.31-40
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• 2007

Proper weight shifting is essential for a successful shot in golf swing and this could be described by means of the ground forces between the feet and ground. It is assumed that the ground forces would different according to the club used because the length and swing weight of each club is different. But, in present, it is not clear what changes are made by the change of clubs and this affect the swing motion. Therefore this study focused on the investigation of the changes of the ground forces and ground reaction forces (GRF) by the change of club length. The subjects were three professional male golfers. Four swings (driver, iron 3, iron 5, and iron 7) for each subject were taken by two high speed video cameras and two AMTI force platforms were used to measure the GRF simultaneously. Kwon GRF 2.0 and Mathcad 13 software were used to post processing the data. Changes of the three major component of GRF (Vertical, lateral, anterior-posterior force) at 10 predefined events were analyzed including the maximum. Major findings of this study were as follows. 1. Vertical forces; - There were no significant changes until the top of backswing. - Maximum was occurred at the club horizontal position in the downswing for both feet. The shorter club produced more maximum forces than longer ones in the left foot, but reverse were true for the right foot. - Maximum forces at impact shows the same patterns. 2. Lateral forces; Maximum was occurred at the club horizontal position for both feet, but there were no lateral forces because the direction of two forces was different. Maximum force pattern by different clubs was same as the vertical component. 3. Anterior-posterior forces; - This component made a counter-clock wise moment about a vertical axis located between two foot until the club vertical position was reached during the backswing, and reverse moment were produced when the club reached horizontal at the downswing. - Also this component made a forward moment about a horizontal axis located in the CG during the fore half of the downswing, and a reverse moment until the club reached vertical at the follow through phase. Maximum was occurred at the club vertical in the downswing for both feet. The longer club produced more maximum forces than shorter ones for both feet.

• 한국통신학회논문지
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• 제19권2호
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• pp.211-224
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• 1994

본 논문에서는 NTSC 칼라영상신호를 프레임내에 휘도신호와 색도신호를 분리하기 위한 새로운 적응형 필터링방식을 제안하였다. 이 방식은 인가되는 신호의 상태, 즉 수직방향에서의 상관관계, 그리고 수평방향과 대각선방향에서의 천이상태를 검출하여 제어신호를 생성하고, 이 신호에 의해 수직 필터군과 수평 필터군에서 각각 적응적으로 필터를 선택하여 처리함으로써 색도신호를 얻으며, 휘도신호는 칼라영상신호에서 색도신호를 감하여 얻는다. 여기에 사용된 필터들은 NTSC 칼라영상신호를 칼라부반송과 주파수의 4배로 샘플링한 경우에 대해서 설계되었으며, 몇가지 평가방법에 의해, 제안된 방식과 기존의 방식을 컴퓨터 시뮬레이션과 SVP(Serial Video Processing) 시스템을 이용하여 비교하였다.

• 한국지능시스템학회논문지
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• 제16권3호
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• pp.297-302
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• 2006

본 논문에서는 지구자계를 이용하여 3축 자계센서의 수직성분자계를 간편하게 보정할 수 있는 방법과 장치를 제안한다. 자계센서의 출력은 설치각도 및 이득오차에 의한 출력 오프셋을 포함하고 있다. 따라서 자계센서를 사용하기에 앞서 보정이 필요하다. 자계센서의 보정은 무자계 공간에서 이루어져야 하나 지구자계를 이용하면 간단하게 자계센서의 출력 오프셋을 보정할 수 있다. 그리고 보정을 위한 장치를 설계하였다. 제안하는 방법과 장치는 실험을 통하여 실용성을 검증하였다.

• 한국지형학회지
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• 제26권1호
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• pp.93-106
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• 2019

The Yangsan Fault is one of the main fault systems in the Korean peninsula. It can be divided into three segments (northern, central, and southern) by its paleoseismic and structural geologic properties. Based on the geomorphic features of the northern segment, which includes the Yugye Fault, we identified deflected streams as a geomorphic marker of strike-slip component of the fault, and knickpoints along the streams as evidence of dip-slip component of the fault. Geomorphic analyses showed that (1) the horizontal displacements of deflected streams decreased and (2) the retreat amounts of knickpoints tend to increased toward north along the lineament. We interpreted the variations caused by strain partitioning; that is, there might be some increases of the vertical component toward north, whereas the main strike-slip fault system dies out, splaying into horsetail structure toward north. Based on the response time of the landforms, these interpretations imply that (1) there were differences between horizontal slip rate and vertical slip rate along strike, and/or (2) there were different timings between horizontal and vertical deformations by fault.

• 수산해양기술연구
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• 제41권2호
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• pp.113-121
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• 2005

How to extimate the angle of attack of a vertical V-type cambered otter board was described. A three-dimensional semi-analytic treatment of a towing cable system was applied to the field experiments of a midwater trawl obtained by the Scanmar system. Also the equilibrium condition of the horizontal component and vertical component of forces and moment around the otter board was used. When the warp length was 300m long and the towing speed was between 2.61 and 3.86 knots, the estimated angle of attack of the otter board was ranged between $24.7^{\circ}$ and $26.2^{\circ}$, though the maximum lift force was at the angle of attack $22^{\circ}$.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.151-158
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• 1999

The single layer latticed domes have various behaviors with each geometrical shape and scale, and they are affected by vertical component as well as horizontal component of the dynamic load. And they represent very different earthquake responses under each ground acceleration compared with another structural systems. Generally, all of the members of latticed domes undergo three dimensional deflections if they are subjected to arbitrary one dimensional horizontal load under earthquake motions. And their response characteristics are very different to their shapes, rise/span ratios, and damping mechanisms. In this study the .earthquake response behavior is verified according to the factor of each shape, rise/span ratio, ana damping ratio of latticed domes, which undergo horizontal and vertical earthquake motions by numerical approaches.