• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.10a
• /
• pp.111-112
• /
• 2013

본 논문에서는 최근 증가하고 있는 차량의 질서 위반 행위 및 과태료 체납, 대포차 등에 대한 문제를 보다 효율적으로 해결하기 위하여 이동이 간편한 스마트 기기를 통하여 차량의 번호판을 인식하고 관리할 수 있는 시스템을 제시하고자 한다. 영상 촬영 기능과 데이터 전송 기능을 가지고 있는 휴대용 단말기를 소지한 사용자가 자동차의 번호판을 촬영했을 시 자동차 번호판을 인식하고 촬영된 영상과 차량 번호에 대한 데이터를 원격지 서버로 전송하여 차량 소유자에 대한 과태료 체납여부, 위반행위 등을 조회하여 해당 차량에 대한 정보 등을 신속하게 확인하고 현장에서 복합적으로 대응할 수 있는 시스템을 개발하고자 한다. 본 논문에서 제시할 주요한 기능은 영상처리를 통한 차량 번호판 인식과 인식된 차량 번호 정보와 번호판 영상 정보를 원격지 서버로 전송하여 정보를 관리 할 수 있는 시스템을 제시하고자 한다.

• Journal of the KSME
• /
• v.29 no.3
• /
• pp.231-243
• /
• 1989

복합재료의 탄성 문제를 정리하면 다음과 같다. 복합재료와 등방성 재료의 탄성학적 차이는 재료의 탄성계수에 기인하며 이것은 각각 다른 형태의 응력-변형률관계를 갖게 한다. 한편 응 력-변형률 관계식을 제외한 탄성학의 지배방정식은 재료의 종류에 관계없이 성립한다. 복합적 층판의 Stiffness와 응력 등은 Lamination 이론을 사용하여 구할 수 있다. 판이론은 평형식을 z방향으로 적분한 식, 즉 합력(resultant force)와 모멘트로 나타낸 평형식을 사용하는데 이 때 처짐 방정식을 구하기 위해 합력. 모멘트-곡률. 변형률 관계식을 이용하는데 이 관계식이 복합 재료와 등방성재료가 상이하다. 결과로 복합재료는 커플링 효과를 갖게 되며, 복합적층판을 대 칭으로 쌓으면 이 효과를 상쇄시킬 수 있다. 복합적층 보의 이론은 유효 굽힘 계수를 도입하면 등방체 보 이론을 사용하여 보의 처짐을 해석할 수 있다. 복합적층 보의 경우 굽힘 응력의 최 대치는 등방체와는 달리 보의 표면에서만 일어나지 않고 내부에서도 일어날 수 있다.

• Journal of Digital Convergence
• /
• v.15 no.1
• /
• pp.239-245
• /
• 2017

For privacy protection, we propose a vehicle license plate region detection method in road view image served from portal site. Because vehicle license plate regions in road view images have different feature depending on distance, long distance vehicle license plate regions are not detected by feature of low resolution. Therefore, we suggest a method to detect short distance vehicle license plate regions by edge feature and long distance vehicle license plate regions using MSER feature. And then, we select candidate region of vehicle license plate region from detected region of each method, because the number of the vehicle license plate has a structural feature, we used it to detect the final vehicle license plate region. As the experiment result, we got a recall rate of 93%, precision rate of 75%, and F-Score rate of 80% in various road view images.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2001.05a
• /
• pp.224-227
• /
• 2001

Adaptive analysis of multilayered composite and sandwich plates is carried out. The adaptive analysis is based on a finite element error form, which measures the difference between the through-the-thickness distribution of finite element displacement and the actual displacement. The region where the error-measure exceeds the prescribed admitted error value, the finite element mesh locally refined in the thickness direction using the mesh superposition technique. Several numerical tests are conducted to validate the effectiveness of the current approach for adaptive analysis of laminated plates.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2001.05a
• /
• pp.5-8
• /
• 2001

A three node flat triangular element incorporating Layerwise Zig-Zag Theory(HZZT) is developed suitable for analyzing damped laminated composite structures. Using an interdependent kinematic relation, the higher order shear rotations are replaced by in-plane displacements, a transverse displacement and section rotations, which result in three translations and two rotations. Natural frequencies and modal loss factors of cantilevered laminated plates with embedded damping layers are calculated with the zig-zag triangular element and compared to the experimental results and MSC/NASTRAN results using a layered combination of plate and solid elements.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2001.10a
• /
• pp.187-190
• /
• 2001

Response surface method is applied to evaluate the reliability of laminated composite panels. Since the linear and nonlinear first-ply failure load are computed using deterministic finite element analysis, new probabilistic finite element analysis is not necessary. Tsai-Wu criterion is used to construct the limit state suface. Material properties, layer thickness and lamina strengths of laminated composite panel are treated as random design variables. feasibility and accuracy of current method is validated using Monte-Carlo method Which perform thousand times of finite element analysis directly.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2002.10a
• /
• pp.56-59
• /
• 2002

This paper presents a study on the permittivities of the E-glass fabric/epoxy composite laminates containing carbon black dispersions at microwave frequency. Measurement showed that the complex permittivities of the composites depend strongly on the natures and concentrations of the carbon black dispersion. A new scheme to obtain a mixing law for the estimation of complex permittivity is proposed. The experimental values of the complex permittivities were compared to those calculated. Simultaneously, the complex permittivity of carbon black itself was also calculated by the scheme.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2000.11a
• /
• pp.257-260
• /
• 2000

The composite composed of glass fabric and BMI resin was fabricated using resin transfer molding(RTM) process. it will be used as a supporting plate of transformer coil for high speed train. To develop a RTM process, permeability of preform was measured and resin properties like a viscosity and gellation time were checked. A resin pre-heating system and a mold system were also designed and developed. Using a vacuum-assisted RTM process, the composite supporting plate was successfully fabricated.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.15 no.3
• /
• pp.723-734
• /
• 1991

본 연구에서는 투사체의 충격으로 인해 복합재에 발생하는 손상을 해석하기 위해 우선 이와 관련이 있는 손상에너지를 구할 수 있도록 동적 유한요소 프로그램을 개발하는데 있으며, 이렇게 구한 결과들을 Husman의 실험결과와 비교함으로써 본 논문 의 유한요소 프로그램이 적층복합보에 충격으로 인하여 전달되는 총에너지와 손상에너 지를 구하는데 타당한 것인가를 검토하고 이 프로그램을 이용하여 다음과 같은 것들을 해석하였다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.1
• /
• pp.55-60
• /
• 2010

The honeycomb composite joint structure designed for application to a tilting KTX railroad car body is subjected to bending loads of a cantilever type. Honeycomb sandwich composite panel-joint attached in the real tilting car body was fabricated and sectioned as several beam-joint specimens for the bending test. The fracture behaviors of these specimens under static loads were different from those under cyclic loads. Static bending loads caused shear deformation and fracture in the honeycomb core region, while fatigue cyclic bend loading caused delamination along the interface between the composite skin and the honeycomb core, and/or caused a fracture in the welded part jointed with the steel under-frame. These fracture behaviors could occur in other industrial honeycomb composite joints with similar sub-structures, and be used for improving design parameters of a honeycomb composite joint structure.