• Journal of KIISE:Software and Applications
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• v.36 no.2
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• pp.122-130
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• 2009

Conventional approaches for car number plate detection have dealt with those input images having similar sizes and simple background acquired under well organized environment. Thus their performance get reduced when input images include number plates with different sizes and when they are acquired under different lighting conditions. To solve these problem, this paper proposes a new scheme that uses the geometrical features of number plates and their topological information with reference to other features of the car. In the first step, those edges constructing a rectangle are detected and several pixels neighboring those edges are selected as the seed pixels for region growing. For region growing, color and intensity are used as the features, and the result regions are merged to construct the candidate for a number plate if their features are within a certain boundary. Once the candidates for the number plates are generated then their topological relations with other parts of the car such as lights are tested to finally determine the number plate region. The experimental results have shown that the proposed method can be used even for detecting small size number plates where characters are not visible.

• Journal of Korean Society of Steel Construction
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• v.28 no.6
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• pp.439-448
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• 2016

Extended end-plate connections(EEPC) are a type of connection applied in Pre-Engineered Building structures comprising beam-column connections of steel structures or tapered members. Extended end-plate connections(EEPC) show different behavioral characteristics owing to the influence of plate thickness, gauge distance of high strength bolt, diameter of high strength bolt frame, and the number of high strength bolts. In the USA and Europe, extended end-plate connections(EEPC) are applied in beam-column connections of steel structures in various forms; however, these are not widely applied in structures in Korea.This can be attributed to the fact that the proposal of design strength types for extended end-plate connections(EEPC), proposal of connection specifications, evaluation of seismic performance, and are not being performed appropriately. Therefore, the purpose of this study is to provide basic data for the domestic application of Unstiffened extended endplate connections. To realize this, nonlinear finite element analysis was conducted on a 12-mm thick Unstiffened extended endplate connections.

• Journal of Korean Society of Steel Construction
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• v.29 no.1
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• pp.81-88
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• 2017

Residual stress is defined as stress that already exists on a structural member from the effects of welding and plastic deformation before the application of loading. Due to such residual stress, welded H-section compression members under centroidal compression load can undergo buckling and failure for strength values smaller than the predicted buckling load and specified compressive strength. Therefore, this study was carried out to evaluate the effect of residual stress from welding on the determination of the buckling load and specified compressive strength of the H-section compression member according to the column length variation. A three-dimensional nonlinear finite element analysis was performed for the H-section compression member where the welded joint was fillet welded by applying heat inputs of 3.1kJ/mm and 3.6kJ/mm using the SAW welding method.

• Journal of Korean Society of Steel Construction
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• v.27 no.2
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• pp.243-250
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• 2015

An extended end-plate connection displays different behavioral properties and energy dissipation capacity based on the thickness and length of the end-plate comprising the connection in the form of a beam-to-column moment connection, the number and diameter of the high strength bolt, the gauge distance of the high strength bolt, and the size and length of the welds. Such extended end-plate is applied to beam-to-column connections in various geometric forms in the US and European regions. Currently in Korea, however, the extended end-plate beam-to-column connection is not actively applied due to the lack of proper design formulas, the evaluation of the energy dissipation capacity, and the provision of construction guidelines. Accordingly, this study was conducted to provide the basic data for the proposal of a prediction model of energy dissipation capacity by evaluating the energy dissipation capacity of unstiffened extended end-plate connections with relatively thin end plate thicknesses. To achieve this, a three-dimensional nonlinear finite element analysis has been conducted on unstiffened extended end-plate connections, with the thickness of the end plate as the set variable.

• Journal of the Korean Geotechnical Society
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• v.34 no.11
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• pp.107-119
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• 2018

PHC piles, extension-plate attached PHC piles, and steel pipe attached PHC piles were installed in field test site. Axial compressive static load tests including load distribution test and Pile Driving Analyzer (after driving) were done on the tip-transformed PHC piles and the grouted tip-transformed PHC piles. Load-displacement curves of three different type of PHC piles, which are PHC pile (TP-1), extension plate attached PHC pile (TP-2) and steel pipe attached PHC pile (TP-3), showed almost the same behavior. Thus bearing capacity increase effect of the tip-transformed PHC piles was negligible. Share ratio of side resistance and end bearing resistance for PHC pile, extension plate attached PHC pile, and steel pipe attached PHC pile were 95.8% vs. 4.2%, 95.6% vs. 4.4%, and 97.8% vs. 2.2% respectively.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1031-1034
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• 2017

기존 번호판 검출 및 인식에 사용되어지는 방법은 사랑이 직접 번호판의 특정을 기술하여 검출을 진행한다. 본 연구에서는 학습 기반의 완전 컨볼루션 신경망을 이용하여 번호판을 검출하였고 신경망은 약 27MB의 용량만으로 110-FPS 정도의 성능을 얻었다. 학습을 위한 데이터는 한국 번호판의 모든 종류 및 주간, 야간의 환경을 포함한 대략 5000개를 직접 수집하였다 또한 5000개의 데이터를 회전 및 이동에 대한 무작위적인 변형을 주어 대략 15000개의 데이터로 확장하였다 확장된 데이터로 얻은 결과로 번호판 검출률 97%를 얻었다.

• Geotechnical Engineering
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• v.35 no.2
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• pp.18-25
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• 2019

• Communications of Mathematical Education
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• v.19 no.3 s.23
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• pp.471-484
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• 2005

무게중심에 관련된 연구는 수학과 물리, 수학과 공학 분야에서 폭넓은 활용을 가지는 간학문적 접근의 한 예이며, 실생활에서의 경험을 수학적 개념 및 방법에 관련시킬 수 있는 흥미로운 영역이라 할 수 있다. 본 연구에서는 문헌연구를 통해 균일한 다각형판의 무게중심 개념을 소개하고, 삼각형판과 볼록사각형판의 무게중심의 위치 및 성질을 조사하고, 이를 확장하여 볼록n각형판에서 무게중심의 위치를 탐구하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.9 s.112
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• pp.829-835
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• 2006

In this paper, new structure of the Cassegrain reflector antenna whose spill-over is efficiently reduced by modified reflectors is proposed for high power. It can be achieved by designing the geometry of subreflector in Cassegrain system using two hyperbolic curves in order to be suitable a lager beamwidth of feeding pattern without broadening main reflector. Finally, radiation efficiency and side lobe level of the proposed Cassegrain reflector antenna can be improved respectively 9 %, 10 dB than conventional one.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.421-422
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• 2013

본 논문에서는 기존 전광판의 문제점을 보안할 수 있는 방법의 하나로 3차원 LED 디스플레이와 이를 제어할 수 있는 안드로이드 앱을 제안하고 구현하였다. 2차원 매트릭스 방식을 사용하고 있는 현재의 전광판을 3차원으로 확장함으로써 다양한 정보 전달이 가능하며 제어를 위해 별도의 하드웨어를 사용하지 않고 안드로이드 앱으로 블루투스 통신을 통해 제어함으로써 간편하면서도 확장이 용이한 제어 구조를 가질 수 있다.