• Journal of Electrical Engineering and Technology
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• 제8권2호
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• pp.262-270
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• 2013

A boundary protection method for power distribution line based on equivalent boundary effect is presented in this paper. In the proposed scheme, the equivalent resonance component with a certain central frequency is sleeve-mounted at the beginning of protected zone. The 'Line Boundary' is built by using boundary effect, which is created by introducing impedance in the primary-side of line. The 'Line Boundary' is significantly different from line wave impedance. Therefore, the boundary protection principle can be applied to power distribution line without line traps. To analyze the frequency characteristic corresponding to traveling-waves of introducing impedance in the primary-side of line, distributed parameters model of equivalent resonance component is established. The results of PSCAD/EMTDC simulation prove the obvious difference of voltage high frequency component between internal faults and external faults due to equivalent resonance component, and validate the scheme.

• 정보처리학회논문지B
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• 제8B권5호
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• pp.539-548
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• 2001

본 연구에서는 배경과 구분되는 이동물체를 추적하기 위한 방법으로 부분 외곽선 정보를 이용한 이동물체 추적 알고리즘을 제안하였다. 이동물체의 추적은 이동물체의 외곽선을 검출한 다음 외곽선 정보를 이동물체의 특징으로 정하여 추적하는 알고리즘을 사용하였다. 먼저 이동물체 외곽선 정보를 이용하여 연속한 동영상 입력에 대하여 속 BMA(Block Matching Algorithm)을 이용하여 움직임 벡터를 추출하고 움직임 벡테를 기초로 이동물체를 추출한다. 다음은 이동물체 초기 특징 벡테 생성단계로서 이동물체에 대한 외곽선을 추출한다. 이동물체의 외곽선 영역 중 상하좌우의 외곽선 일부분을 특징벡터로 정한다. 다음은 추적단계로 이전 프레임에서 얻은 특징벡터를 이용하여 현재 프레임에서 이동물체의 추적을 수행하였다. 제안된 알고리즘에 대하여 실제영상을 가지고 이동물체추적 모의 실험을 수행한 결과 기존 능동 윤곽선 추적알고리즘은 물체 외곽선 전체를 추적하기 때문에 물체의 외곽선 길이에 따라 처리시간이 변화하지만 제안된 알고리즘은 이동물체의 외곽선 영역을 특징정보로 하여 추적하기 때문에 추적연산이 간단하였다. 제안된 이동물체 추적알고리즘 중 이동벡터를 추출하는 BMA 연산은 기존 알고리즘 보다 연산량이 약 39%감소였으며, 상하 좌우 외곽선 정보를 이용하여 이동물체를 추적한 결과 추적오차는 특징벡터의 크기가 [$10{\times}5$]일 때 검색오차가 2화소 이하로 양호하게 나타났다. 또한 기본 능동 윤ㅅ곽선 축적알고리즘은 물체 외곽선 크기에 따른 처리시간이 변화하지만 제안된 알고리즘은 특징벡터의 크기가 일정하기 때문에 동일한 처리시간이 필요하였다.

• 한국농공학회지
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• 제11권3호
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• pp.1742-1748
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• 1969

This is a method to determine the boundary line of reservoir flooding area which will be purchased. Until now, flood water level was used as the boundary line. By lowering this line from flood water level, purchasing cost of reservoir flooding area can be cut down. Sometimes, temporary flooding of arable land outside the boundary occurs. During the life of reservoir, flood damage to crop product on of this land must be indemified with net berefit from arable land between the bovndary line and normal water level. Following is the basic formula to determine the line. (Estimated flood damage to crop production of land outside the boundary line $\leqq$ Estimated net beneift from land between the boundary line and normal water level.) Minimum difference between both sides is needed to minimize the purchasing area. Flood damage and net benefit are estimated by hydrologic estimation with rainfall data and crop production estimation.

• Journal of applied mathematics & informatics
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• 제5권1호
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• pp.111-124
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• 1998

Existence results of multiple solutions are obtained un-der suitable conditions for impulsive integrodifferential boundary value problems on the half-line which may be singular at the boundary.

• 정보처리학회논문지B
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• 제9B권3호
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• pp.359-368
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• 2002

본 논문에서는 매칭 에러 영상과 이동벡터를 이용한 효율적인 이동물체 외곽선 검출 알고리즘과 부분외곽선 정보를 이용한 이동물체 고속 추적 알고리즘을 제안하였다. 이동물체의 외곽선 검출은 watershed 알고리즘을 기반으로 확률분포함수를 적용하여 seed 영역을 생성하고 seed 영역을 확장하여 이동물체의 윤곽선을 검출한 다음 이동벡터를 이용하여 최종 외곽선을 추출한다. 외곽선 중 일부를 특징으로 하여 이동물체를 추적하는 알고리즘을 사용하였다. 이동물체 초기 특징 벡터는 이동물체의 외곽선 영역 중 상하좌우의 외곽선 일부분을 특징벡터로 정한다. 다음은 추적단계로 이전 프레임에서 얻은 특징벡터를 이용하여 현재 프레임에서 이동물체의 추적을 수행하였다. 실제영상에 대하여 제안된 알고리즘으로 이동물체추적 모의 실험을 수행한 결과 기존 능동 윤곽선 추적알고리즘은 물체 외곽선 전체를 추적하기 때문에 물체의 외곽선 길이에 따라 처리시간이 변화하지만 제안된 알고리즘은 이동물체의 외곽선 영역을 특징정보로 하여 추적하기 때문에 추적 연산이 간단하였다. 고속이동벡터를 추출 BMA 연산은 기존 알고리즘 보다 연산량이 약 39% 감소였고, 이동 물체 외곽선 검출 알고리즘은 과분할 문제점이 발생하지 않았으며, 상하 좌우 외곽선 정보를 이용하여 이동물체를 추적한 결과 추적오차는 특징벡터의 크기가 $(15\times{5)}$일 때 검색오차가 4 화소 이하로 양호하게 나타났다.

• 한국환경과학회지
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• 제18권10호
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• pp.1143-1153
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• 2009

The purpose of this study is to propose an appropriate method for marking out a boundary line of area damaged by aircraft noise. In an actual situation, there are many gaps between the boundary line of aircraft noise contour and the boundary line of an occupant of a house. Three cases faced in practice are considered in this study. Case I is considered the land number together with sub-number. The Tong and Ban (the residential district number in Korea) are considered in Case II. In Case III, the configuration of ground is examined. The authors expect that the authority of aviation affairs should choose one of these cases and put in force in the near future.

• The Korean Journal of Ecology
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• 제21권5_2호
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• pp.491-499
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• 1998

An investigation was performed to establish the mathematical theories of a vibration for the plant growth and a wave distribution of a plant population on the boundary condition of a limiting factor in the environment. The mathematical theories of the plant growth vibration and wave distribution had been elucidated by the plant growth and the timber line on the middle slope of the west side of Mt. Paektu. The Betula ermaruii composes the timber line on about 2,060 m elevation of sea label, has a growth vibration on the ground surface and takes a wave distribution due to a boundary condition of alpine temperature gradient.

• 한국전산유체공학회지
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• 제12권1호
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• pp.1-8
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• 2007

A code is developed using the hybrid Cartesian/immersed boundary method and it is applied to simulate flows around a three-dimensional deforming body. A new criterion is suggested to distribute the immersed boundary nodes based on edges crossing a body boundary. Velocities are reconstructed at the immersed boundary nodes using the interpolation along a local normal line to the boundary. Reconstruction of the pressure at the immersed boundary node is avoided using the hybrid staggered/non-staggered grid method. The developed code is validated through comparisons with other experimental and numerical results for the velocity profiles around a circular cylinder under the forced in-line oscillation and the pressure coefficient distribution on a sphere. The code is applied to simulate the flow fields around a plate whose tail is periodically flapping under a translation. The effects of the velocity and acceleration due to the deformation on the periodic shedding of pairs of tip vortices are investigated.

• 대한전기학회논문지:시스템및제어부문D
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• 제49권12호
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• pp.675-682
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• 2000

When a system is composed of multi-boards, an efficient bus arbitration method for the data transfer bus must be provided for guaranteeing proper operations. In this paper, a new test methodology is developed which is used for testing on-line bus arbitration. In the new test methodology, events that are occurred during bus arbitration are defined, and expected signals during fault-free bus arbitration are compared with the signals captured during on-line bus arbitration using boundary-scan cells. For this, a new test architecture is proposed which is efficient for the maintenance and the repair of multi-board systems. In addition, the new methodology can be used with off-line interconnect test using boundary-scan.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.176-181
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• 2000

Stress intensity factors for a rigid line inclusion tying along a bimaterial interface are calculated by the boundary element method with the multiregion and double-Point techniques. The formula between the stress intensity factors and the inclusion surface stresses are derived. The numerical values of the stress intensity factors for the bimaterial interface rigid line inclusion in the infinite body are proved to be in good agreement within 3% when compared with the previous exact solutions. In the finite bimaterial systems, the stress intensity factors for the center and edge rigid line inclusions at interface are computed with the variation of the rigid line inclusion length and the shear modulus ratio under the biaxial and uniaxial loading conditions.