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SpPCA와 MLP에 기반을 둔 응합법칙에 의한 MRS 패턴분류
송창규,이대종,전병석,유정웅,Song Chang kyu,Lee Dae jong,Jeon Byeong seok,Ryu Jeong woong 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.9C
본 논문에서는 SpPCA와 MLP에 기반을 둔 융합법칙에 의한 MRS 패턴분류기법을 제안한다. 차원축소를 위해 사용되는 기존의 PCA 기법은 입력데이터가 비선형 특성을 갖는 경우 최적의 변환행렬을 구할 수 없다는 문제점을 가지고 있다. 따라서, 본 논문에서는 구간별로 입력데이터를 분할한 후 PCA에 의해 특징을 추출하는 SpPCA 기법을 이용하여 입력패턴의 차원을 축소한다. 다음 단계인 분류단계에서는 MLP 비선형분류기를 이용하여 구간마다 추출된 특징벡터를 이용하여 기준패턴과의 유사도를 산출한다. 최종 분류단계에서는 MLP에 의해서 산출된 유사도에 기반을 둔 융합법칙에 의하여 MRS 패턴을 분류한다. 제안된 방법의 유용성을 보이기 위한 실험결과에서 기존의 방법들에 비해서 향상된 인식결과를 보임을 확인하였다. In this paper, we propose the MRS p:Ittern classification techniques by the fusion scheme based on the SpPCA and MLP. A conventional PCA teclulique for the dimension reduction has the problem that it can't find a optimal transformation matrix if the property of input data is nonlinear. To overcome this drawback we extract features by the SpPCA technique which use the local patterns rather than whole patterns. In a next classification step, individual classifier based on MLP calculates the similarity of each class for local features. Finally, MRS patterns is classified by the fusion scheme to effectively combine the individual information. As the simulation results to verify the effectiveness, the proposed method showed more improved classification results than conventional methods.
송창규,이상돈,조용주,Song, Chang-Kyu,Lee, Sang-Don,Cho, Yung-Joo 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.2
It is very important to connect machinery and maintain it. This is usually done by bolt joint. There are two ways in connecting the bolt joint : the angle method and the torque method. The torque method is a method that let the clamping force maintain. The underhead of the bolt's head and the thread friction are the main influences. This study focuses on how the clamping farce and friction coefficient change under the condition in vibrating the underhead of the bolt's head part. As a result, under vibration condition, we found out that the clamping farce increases, while the friction coefficient decreases.
송창규(Chang-Kyu Song),권석영(Seok-Young Kwon),전명근(Myung-Geun Chun) 한국지능시스템학회 2007 한국지능시스템학회논문지 Vol.17 No.3
컨투어렛 변환은 2차원의 웨이블렛 변환을 확장한 개념으로 다중스케일과 방향성필터뱅크를 이용한다. 이러한 컨투어렛 변환은 웨이블렛 변환의 특징인 다중스케일과 시간-주파수의 지역적 특성뿐만 아니라 방향성분에 대해서도 풍부한 정보를 얻을 수 있는 장점을 가지고 있다. 본 논문에서는 컨투어렛 변환과 주성분분석기법을 이용하는 융합기법에 의한 얼굴인식 시스템을 제안한다. 제안된 방법은 먼저 컨투어렛 변환에 의해 얼굴영상을 방향성 부대역 영상으로 분할한 후, 주성분분석기법을 이용하여 방향성분별로 분할된 각각의 부영상에 대하여 특징벡터를 산출한다. 그리고 최종 단계에서는 각각의 대역별로 산출된 매칭도를 효과적으로 융합할 수 있는 융합기법을 이용하여 얼굴인식을 수행한다. 제안된 방법의 타당성을 보이기 위해 ORL 얼굴영상과 CBNU 얼굴영상을 대상으로 실험한 결과 기존 방법인 PCA나 웨이블렛 변환을 이용한 방법에 비해 향상된 인식 성능을 보임을 확인할 수 있었다. Contourlet transform is an extention of the wavelet transform in two dimensions using the multiscale and directional filter banks. The contourlet transform has the advantages of multiscale and time-frequency-localization properties of wavelets, but also provides a high degree of directionality. In this paper, we propose a face recognition system based on fusion methods using contourlet transform and PCA. After decomposing a face image into directional subband images by contourlet, features are obtained in each subband by PCA. Finally, face recognition is performed by fusion technique that effectively combines similarities calculated respectively in each local subband. To show the effectiveness of the proposed method, we performed experiments for ORL and CENU dataset, and then we obtained better recognition performance in comparison with the results produced by conventional methods.
송창규(Chang Kyu Song),이후상(Husang Lee),박천홍(Chun Hong Park),이호철(Hocheol Lee) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
The large optics in the telescope need an extreme level of both form accuracy and surface roughness such as sub-nanometer. To get the large optics of high quality surface, our strategic approach is to make a hybrid and complex machine with grinding, polishing, and measurement function. Therefore, the machine is being equipped with the ELID grinding and the computer-controlled polishing and the optics interferometer module to manufacture a large optics in short cycle. Its current goal is pursuing to acquire a large mirror optics of diameter 1.5m and final form accuracy is λ/10(50㎚) rms. In this paper to show our first result, we described machine design process by the error budget analysis and the conceptual arrangement of machine modules and machine structure and positioning performance was experimentally verified.
송창규(Chang Kyu Song),김병섭(Byung-Sub Kim),노승국(Seung-Kook Ro),이성철(Sungcheul Lee),민병권(Byung-Kwon Min),정영훈(Young Hun Jeong) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.3
Control systems in machinery equipment provide correction signals to motion units in order to reduce or cancel out the mismatches between sensor feedback signals and command or desired values. In this paper, we introduce a simulator for control characteristics of machinery equipment. The purpose of the simulator development is to provide mechanical system designers with the ability to estimate how much dynamic performance can be achieved from their design parameters and selected devices at the designing phase. The simulator has a database for commercial parts, so that the designers can choose appropriate components for servo controllers, motors, motor drives, and guide ways, etc. and then tune governing parameters such as controller gains and friction coefficients. The simulator simulates the closed-loop control system which is built and parameter-tuned by the designer and shows dynamic responses of the control system. The simulator treats the moving table as a 6 degrees-of-freedom rigid body and considers the motion guide blocks stiffness, damping and their locations as well as sensor locations. The simulator has been under development for one and a half years and has a few years to go before the public release. The primary achievements and features will be presented in this paper.
대형 광학계 연마 장비에 의한 대구경 반사경의 최적 근사 구면 제조 방법에 관한 연구
송창규(Chang Kyu Song),김경호(Gyungho Khim),황주호(Jooho Hwang),김병섭(Byung Sub Kim),박천홍(Chun Hong Park),이호철(Hocheol Lee) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.3
This paper describes a novel method to surface large optics mirror with an extremely high hardness, which could replace the high cost of the repetitive off-line measurement steps and the large ultraprecision grinding machine with ultra-positioning control of 10 nm resolution. A lot of diamond pellet to be attached on the convex aluminum base consists of a grinding tool for the concave large mirror, and the tool was pressured down on the large mirror blank. The tool motion at an interval on the spiral path was controlled with each feed rate as the dwell time in the conventional computer-controlled polishing. The shape to be surfaced was measured directly by a touch probe on the machine without any separation of the mirror blank. Total 40 iterative steps of the surfacing and measurement could demonstrate the form error of RMS 7.8 μm, surface roughness of Ra 0.2 μm for the mirror blank with diameter of 1 m and spherical radius of curvature of 5400 mm.