• 전자공학회논문지B
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• 제31B권4호
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• pp.1-8
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• 1994

In this paper, we propose an efficient two-step pattern matching method which promises shape distortion-tolerant recognition of handwritten of handwritten Hangul syllables. In the first step, nonlinear shape normalization is carried out to compensate for global shape distortions in handwritten characters, then a preliminary classification based on simple pattern matching is performed. In the next step, nonlinear pattern matching which achieves best matching between input and reference pattern is carried out to compensate for local shape distortions, then detailed classification which determines the final result of classification is performed. As the performance of recognition systems based on pattern matching methods is greatly effected by the quality of reference patterns. we construct reference patterns by combining the proposed nonlinear pattern matching method with a well-known averaging techniques. Experimental results reveal that recognition performance is greatly improved by the proposed two-step pattern matching method and the reference pattern construction scheme.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.607-608
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• 2012

• 전자공학회논문지A
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• 제31A권7호
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• pp.55-62
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• 1994

Interpattern association (IPA) model which the interconnection weight matrix(IWM) is constructed by the association between patterns is effective in similar pattern recognitions. But, if the number of reference patterns is increased, the ability of recognition is decreased. Using a hierarchical recognition algorithm which adopts the tree search strategy, we classified reference patterns into sub-groups by similarity. In IPA model, if input includes random noise we make it converge to reference pattern by means of input includes random noise we make it converge to reference pattern by means of increasing the number of pixels of prohibited state in IWM. In relation to reference patterns the pixel of prohibited state made partially prohibited state of no connected state using which is not included common and feature regions by each reference patterns.

• 한국정보통신학회논문지
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• 제11권3호
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• pp.500-506
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• 2007

Type Object 디자인 패턴은 하나의 클래스가 수많은 하위 클래스를 갖거나, 그 하위 클래스의 개수를 소프트웨어 개발시에 예측할 수 없는 상황을 해결하고자 제시된 패턴이다. 그러나, 이 패턴은 적용력과 여러 장점에도 불구하고 인스턴스를 생성하는 클래스와 그 인스턴스의 실제적 클래스가 분리되어 있고 또한 객체 레퍼런스에 의해서 서로 연관되어 있으므로 이에 대한 관리를 위한 메커니즘과 패턴의 이해에 있어서 많은 복잡성을 갖는 문제점이 있다. 본 논문에서는 이러한 문제를 해결하기 위한 Type Object Class의 설계와 구현을 제시한다. 즉, Type Object 패턴의 Type Class와 Object Class로부터 Type Object Class를 설정하고, 이를 런타임에 생성되고 사용되게 함으로써, 인스턴스들이 객체 지향프로그래밍 언어에서 제공하는 고유의 클래스를 참조하게 되어 별도의 클래스 참조 메커니즘을 가질 필요가 없도록 하였다. 따라서, 별도의 클래스 참조 메커니즘을 개발하는 부담과 이 메커니즘의 동작으로 인한 실행 상의 성능 저하의 문제가 개선되는 효과가 있다.

• 융복합기술연구소 논문집
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• 제2권1호
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• pp.43-48
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• 2012

Generally, in-plane position of moving object is measured referring to the reference pattern attached to the object. From optical camera to magnetic reluctance probe, there are many ways detecting a variation of the periodical pattern. In this paper, the various operating principles developed for in-plane positioning are reviewed and compared each other. And, a novel method measuring large rotation as well as x, y linear displacements is suggested, including a detailed description of the overall system layout. It is a modified version of the surface encoder, which is a robust digital measuring method. From the surface encoder, the rotation of an object is measured indirectly through a compensated input of optical servo and independently of linear displacements. So, the operating range can be extended simply by enlarging the reference pattern, without magnifying the decoding units.

• 한국의류학회지
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• 제31권5호
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• pp.692-704
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• 2007

Recently, Basic patterns with excellent body fitness and automation availability are required to be developed in order to automate the patterns of women's clothes. In this study, this reference points, reference lines and segments were fixed onto 3D scan data for the lower body the women in their twenties, they were directly spread out to be 2D flat pattern to facilitate development into the design of slacks adhered closely to the human body such as special and highly-functional clothes, and then slacks 2D pattern was developed for the purpose of seeking scientific approach to the development into basic form slacks and 3d emotional pattern. For conversion of 3D pattern into 2D flat pattern, reference points and segments were created by using Rapid Form of 3D shape analysis software, and triangle mesh of the body surface of the created shape was developed with Auto CAD 2005. The correspondence between slacks and human body was examined by the fixation of major reference lines. Specially, the wearing characteristics of slacks were considered by the fixation of side lines in consideration of posture. As a result of using the way of development to constantly maintain the length while 3D triangle mesh is converted into 2D flat mesh, the shape was shown to be excellently reproduced, and the area of flat pattern was increased compared to the shape of parting plane. Also, the sunk-in curve like the brief line of front crotch length needed a cutting line when it was closely adhered, when mesh was overlapped, and the pattern area was smaller compared to the actual shape.

• Smart Structures and Systems
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• 제17권5호
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• pp.725-742
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• 2016

This paper is focused on stiffness ratio effect and a new method to specify the best pattern of piezoelectric patches placement around a hole in a plate under tension to reduce the stress concentration factor. To investigate the stiffness ratio effect, some different values greater and less than unity are considered. Then a python code is developed by using particle swarm optimization algorithm to specify the best locations of piezoelectric actuators around the hole for each stiffness ratio. The results show that, there is a line called "reference line" for each plate with a hole under tension, which can guide the location of actuator patches in plate to have the maximum stress concentration reduction. The reference line also specifies that actuators should be located horizontally or vertically. This reference line is located at an angle of about 65 degrees from the stress line in plate. Finally two experimental tests for two different locations of the patches with various voltages are carried out for validation of the results.

• 한국음향학회지
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• 제6권1호
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• pp.23-28
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• 1987

본 연구에서는 집단화 알고리즘을 이용하여 한국어 단독음의 표준 패턴을 설정하였다. Minimax기법을 이용하여 각 단독음에 대하여 최고 3개까지 표준패턴을 설정하여 인식하였다. 특징 파라미터는 선형예측계수와 자기 상관 계수를 이용하였으며 패턴들 간의 유사도 비교는 Itakura가 제안한 거리측정법을 이용하였다. 표준패턴을 1개만 설정하였을 때 $55.9\%$, 2개를 설정했을 때 $76.9\%$, 3개를 설정했을 경우는 $89.5\%$의 인식률을 얻었다.

• 한국정보통신학회논문지
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• 제10권2호
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• pp.398-405
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• 2006

인간은 관심을 가지고 있는 영역(ROI)에 대하여 선택적으로 주의를 집중하여 사물의 특징 을 인식하게 된다. 본 연구에서는 이러한 인간의 선택적 지각 능력을 적용한 패턴 분류 모델을 제안한다. 먼저 일반적인 클러스터링 알고리즘에 의해 입력 패턴들을 대략적으로 분류하여 참조 클러스터 패턴을 형성하고, 생성된 클러스터의 참조 패턴들을 상호 연관시켜 선택적 지각맵(SPM : Selective Perception Map)을 구성한다. 패턴 분류 및 인식 과정에서는 생성된 SPM을 입력 패턴과 참조 패턴과의 거리 계산에서 가중치로 적용함으로써 인간의 선택적 지각 능력을 패턴 분류에 반영하게 된다. 다양하게 변형된 인쇄체 숫자 및 필기체 숫자 데이터(MNIST)를 통해 실험해 본 결과 SPM을 사용한 패턴 분류 모델이 효과적임을 증명하였다.

• 제어로봇시스템학회논문지
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• 제15권5호
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• pp.548-554
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• 2009

We propose an automatic inspection system for hologram with multiple patterns. The system hardware consists of illuminations, camera, and vision processor. Multiple illuminations using LEDs are arranged in different directions to acquire each image of patterns. The system software consists of pre-processing, pattern generation, and pattern matching. The acquired images of input hologram are compared with their reference patterns by developed matching algorithm. To compensate for the positioning error of input hologram, reference patterns of hologram for different position should be generated in on-line. We apply a frequency transformation based CGH(computer-generated hologram) method to generate reference images. For the fast pattern matching, we also apply the matching method in the frequency domain. Experimental results for hologram of Korean currency are then presented to verify the usefulness of proposed system.