• Journal of KIISE:Computer Systems and Theory
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• v.31 no.10
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• pp.603-609
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• 2004

Procedural texture has many advantages that its representation is extremely compact and unfixed in resolution. However, it can be difficult for an end-user having no programming skill to build and debug. This paper presents a new interactive design system for procedural texture generation. The user's interactive design process based on multi-layer operations is represented with a graph structure, which consists of the data node, the operation and the output. Since our system generates automatically a shading language, a user who is not acquainted with implicit concepts can make procedural texturing by using an intuitive and flexible interface. Simulation results showed that the proposed method can make a variety of texture patterns efficiently.

• Journal of the Korea Computer Graphics Society
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• v.23 no.5
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• pp.1-7
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• 2017

We propose a complex crack generation technique which is represented when impact is applied to glass. The crack patterns expressed when external forces are applied to the glass are classified into dense, radial, and concentric cracks, and we use procedural methods to efficiently represent crack patterns. Based on the input external force, we synthesize the crack example and apply the L-system based on this example to model the propagation shape of the crack in real time. Although physics based crack generation can analyze and model accurate cracks, it has a disadvantage of slow computation because of its high computational cost, and procedural methods have a relatively fast rate of continuity, but are not sufficient to capture accurate crack characteristics. We modeled cracks in glass using L-system to achieve both of these advantages. As a result, it realistically represented the microscopic crack patterns of glass in real time.

• Proceedings of the Korean Fiber Society Conference
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• 1995.10a
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• pp.172-172
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• 1995

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.1194-1197
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• 2012

디자인 패턴은 소프트웨어 설계 시 반복적으로 발생하는 문제를 해결하기 위한 방법을 기술한다. 특히, 객체지향 기술을 기반으로 하는 컴포넌트 설계 시 디자인 패턴을 활용함으로써 특정 설계 문제에 대한 해결책을 재사용할 수 있다. 좋은 객체 지향 설계는 재사용성, 확장성 및 유지보수성을 제공하는 것이며, 디자인 패턴은 좋은 설계에 필요한 구성 요소들의 관계 구조를 제시한다. 본 논문은 객체지향 기반의 컴포넌트 프레임워크 설계 시 프레임워크의 확장성과 구현 컴포넌트의 재사용성을 늘리기 위한 방안으로 디자인 패턴의 활용법을 제시한다. 특히, 알고리즘 재사용의 구조를 제시하는 전략 패턴과 처리 절차 재사용의 구조를 제시하는 템플릿 메서드 패턴의 구조를 비교하고, 분산 통신 컴포넌트 설계 시 전략 패턴의 적용 사례를 보여준다.

• Journal of Korea Game Society
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• v.14 no.5
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• pp.97-106
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• 2014

This study proposes an efficient method to model various and diverse leaves required to express digital plants such as flowers and trees in virtual landscape easily and intuitively. The proposed procedural method divides a leaf mainly into a blade and vein thereby detecting contours from binary images that correspond to blades and generating leaves by modeling leaf veins procedurally based on the detected contours. First of all, a complicated leaf vein structure is divided into main veins, lateral veins, and tertiary vein while all veins grow procedurally directing from start auxin to destination auxin. Here, to calculate destination auxin required for growth automatically, approximated contours from binary images that correspond to blades are found thereby calculating candidate destination auxin. Finally, natural digital leaves are generated by applying a color combination method. Through the proposed method, natural and various leaves can be generated and whether the proposed method is efficient or not is verified through the experiment.

• Journal of the Korean Institute of Intelligent Systems
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• v.11 no.9
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• pp.817-821
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• 2001

In this paper, a new learning methodology for kernel methods that results in a sparse representation of kernel space from the training patterns for classification problems is suggested. Among the traditional algorithms of linear discriminant function, this paper shows that the relaxation procedure can obtain the maximum margin separating hyperplane of linearly separable pattern classification problem as SVM(Support Vector Machine) classifier does. The original relaxation method gives only the necessary condition of SV patterns. We suggest the sufficient condition to identify the SV patterns in the learning epoches. For sequential learning of kernel methods, extended SVM and kernel discriminant function are defined. Systematic derivation of learning algorithm is introduced. Experiment results show the new methods have the higher or equivalent performance compared to the conventional approach.

• Journal of the Korea Society of Computer and Information
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• v.4 no.1
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• pp.28-37
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• 1999

In this paper. we developed a delay test architecture and test procedure for clocked 5-bit asynchronous counter circuit based on boundary scan architecture. To develope, we analyze the problems of conventional method on delay test for clocked sequential circuit in boundary scan architecture. This paper discusses several problems of delay test on boundary scan architecture for clocked sequential circuit. Conventional test method has some problems of improper capture timing, of same pattern insertion, of increase of test time. We suggest a delay test architecture and test procedure, is based on a clock count-generation technique to generate continuous clocks for clocked input of CUT. The simulation results or 5-bit counter shows the accurate operation and effectiveness of the proposed delay test architecture and procedure.

• The KIPS Transactions:PartA
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• v.12A no.7 s.97
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• pp.589-596
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• 2005

Source code quality is very Important that software embedded into product is difficult to change. In order to improve source code quality, it should be considered the quality of analysis and design models as well as the quality of source code. In this paper, we suggest 'Practice Pattern' as one of practical techniques to improve embedded software source code quality. Practice pattern is a procedural pattern to guide modeling and coding activities in software development phases. We believe that applying our pattern provides the improvement of optimum performance, modularization, and portability for embedded software source code.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.562-565
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• 2010

시각기반 증강현실 시스템의 구현을 위해서는 입력되는 카메라영상의 프레임을 매번 특징점을 추출하고 패턴 매칭 과정을 반복하는 것은 저 사양의 모바일 기기에서는 적합하지 않다. 본 논문에서는 이러한 문제점을 해결 하고자 카메라영상에서 패턴이 한번 인식되게 되면 그 이후의 영상에 대해서는 패턴 인식과정을 생략하고 이전 영상에서 매칭된 특징점을 광류 기반 추적기법을 사용하여 추적하도록 한다. 또한 패턴 추적 절차의 수행 중 추적이 실패하여 생기는 특징점 소실 문제는 정확한 호모그래피 행렬과 카메라 자세 추정을 어렵게 하는데 이러한 문제를 해결하도록 하는 패턴 추적의 성공 또는 실패는 판단하는 기준을 세워 모바일 기기에서 빠르게 동작하도록 하는 광류 추적 기법을 사용한 자연 특징 추적 기반 증강현실 시스템을 제안한다.

• Annual Conference on Human and Language Technology
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• 2023.10a
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• pp.615-617
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• 2023

이 연구는 한국어 명사구를 말뭉치로부터 추출하는 방법의 하나로 의존관계 패턴에 기반한 접근방법을 제안하는 것을 목적으로 한다. 이 방법론을 활용한 경우에 명사구 추출의 정확성을 높일 수 있다. 이 논문에서는 한국어 법령 의존 말뭉치를 구축하는 단계부터 상위 명사구 목록을 생성하기 까지 거치는 5단계에 대해 상세하게 논의하는 한편, 의존구조 검색시스템을 통해 의존관계 패턴을 추출하는 절차에 대해 기술하고 이 작업을 수행하기 위한 검색식들의 특성들에 대해 검토한다.