• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.65-70
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• 2005

This paper introduces an approach to multi-layered product knowledge model for collaborative engineering environment. The participants in collaborative engineering want to share and reason product knowledge through internet without any heterogeneity and ambiguity. However the previous knowledge models are limited in providing those aspects. In this paper, the collaborative engineering domain is analyzed and then the product knowledge is organized into four levels such as product context model, product specific model, product design model and product manufacturing model. The four levels are represented by first-order logic in layered fashion. The concepts and the instances of a formal ontology are used for recursive representation of the four levels. The instances of the concepts of an upper level like product context model are considered as the concepts of an adjacent lower level like product specific model, and this mechanism is applied to the other levels. These logic representations are integrated with the schema and the instances of a relational database. OWL representation of the four levels is defined through the integration of the logic representation and OWL primitives. The four product knowledge models have their major representation according to the characteristics of each model. This approach enables engineer to share product knowledge through internet without any ambiguity and utilize it as basis for additional reasoning.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권10호
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• pp.5006-5022
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• 2017

Effect and robust detection of targets in infrared images has crucial meaning for many applications, such as infrared guidance, early warning, and video surveillance. However, it is not an easy task due to the special characteristics of the infrared images, in which the background clutters are severe and the targets are weak. The recent literature demonstrates that sparse representation can help handle the detection problem, however, the detection performance should be improved. To this end, in this text, a hybrid method based on local sparse representation and contrast is proposed, which can effectively and robustly detect the infrared targets. First, a residual image is calculated based on local sparse representation for the original image, in which the target can be effectively highlighted. Then, a local contrast based method is adopted to compute the target prediction image, in which the background clutters can be highly suppressed. Subsequently, the residual image and the target prediction image are combined together adaptively so as to accurately and robustly locate the targets. Based on a set of comprehensive experiments, our algorithm has demonstrated better performance than other existing alternatives.

• International Journal of Costume and Fashion
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• 제5권2호
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• pp.68-77
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• 2005

In contemporary advertising market, one of main trends is to speak surrealistic visual language which provides 'enjoyable spectacles'. Specially, in the beginning of 21st century, there discovered more and more exhibitions and discourses about surrealism reinterpreted from the viewpoint of postmodernism. Surrealism as a creative style of expression based upon free association, has been a great inspiration for fashion ads for commercial communication as well as fashion design since its origin. However, there has been ignored the idea of analyzing surrealistic image expressed in fashion ads in spite of their flood. Accordingly, the purpose of this study is to grasp its cultural meaning through analyzing aesthetic characteristics of surrealistic image expressed in fashion ads. It will provide a better understanding of surrealistic image in fashion ads reflecting popular taste and preference directly as popular visual culture, focusing on post modern context. A case study of surrealistic fashion ads limits to TV or print commercials and digital ads as image ads stimulating visual expressions. The Results can be summarized as follows. Surrealism is an avant garde style which deconstructs the established meaning system as well as the existing formalistic order and then put them together in the frame of 'dream' and 'unconsciousness'. Defamiliarization questioning the whole edifice of representation can be adapted to. By means of paradox and metaphor, unfamiliar new visual world can be represented. The plastic characteristics of surrealistic image in fashion ads are founded as surrealistic styling of time and space, distortion of object by methods of automatism, depaysement, parody and trompe-l'oeil which bring about the deconstruction of gestalt. Aesthetic values of surrealistic fashion ads appear as dualistic representation, allegoric symbolism, fantastic romanticism. Ultimately they lead to marvelous. mysterious, humorous visual effects. Foster reinterpreted these effects of surrealism from Freud's 'Uncanny Concept'. 'Uncanny' means the phenomenon recurring to familiar being defamiliarized by repression. Surrealistic fashion ads strengthen this shocking effect more and more dramatically in company with our post modern needs for fantastic adventure and thrilling spectacle. It can be thought that surrealistic fashion ads reflects uncanny as an alternative which can relieve us of our stress and anxiety and which realize our potential desire in contemporary post industrial stage.

• 한국게임학회 논문지
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• 제5권4호
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• pp.3-12
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• 2005

미디어 영상, 예술 분야에서의 표현 특징들 중 초현실주의의 표현 기법을 이용한 많은 작품이 출시되고 있으며 이에 대한 연구가 시작 진행되고 있다. 그러나 아직 게임 캐릭터의 표현 특징 중 초현실주의의 표현 특징에 관한 연구는 거의 전무한 상태이다. 따라서 본 논문에서는 초현실주의에서의 표현 기법을 중심으로 판타지 게임 캐릭터의 표현 특징을 분석하였다. 그 결과, 초현실주의에서는 신체의 일부와 동물 또는 다른 사물을 꼴라쥬 하는 형태와 변형, 그리고 왜곡을 이용하여 현실에 존재하지 않는 이미지들을 표현하였는데 이러한 방법들은 판타지를 기반으로 한 온라인 게임 캐릭터에서도 유사하게 사용되었다. 본 논문은 미학적 맥락 속에서 판타지 게임 캐릭터들의 특징을 분석하여 현 시대 문화적 배경 속에 게이머들의 심리를 이해하여 보다 호감 있고 창조적인 게임 캐릭터 제작에 도움을 주며, 예술 기법 활용의 가능성을 증가시켜 창의적인 게임 그래픽 제작의 가능성을 여는데 의미가 있다.

• 디지털콘텐츠학회 논문지
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• 제15권6호
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• pp.701-710
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• 2014

본 논문에서 중심적으로 논의하고 있는 일본 장편 애니메이션의 의미작용 체계에 대한 접근은 궁극적으로 일본 장편 애니메이션에서 보이는 표현과 소통의 특징을 분석하는 것이다. 구체적인 스토리를 중심으로 하는 대부분의 캐릭터 애니메이션 작품은 의미작용 체계에 있어서 외시의미와 함축의미를 동시에 담고 있지만, 각 작품에서 추구하는 의미작용 체계의 특징에 따라서 미학적 표현과 소통의 경향이 다르게 나타난다. 본 논문은 방법론적으로 일본의 문화사회적 배경과 특징을 토대로 하여 일본 애니메이션에 나타나는 의미작용을 살펴보고 있다. 일본의 장편 애니메이션은 대체로 함축의미적인 의미작용 체계와 미학적 표현을 강조하며, 외시의미와 몰입을 강화하는 디즈니의 장편 애니메이션들과는 달리 관객 스스로가 작품에 담겨진 함축의미를 고찰하고 해석하도록 하는 경향이 두드러지게 나타난다. 그러므로 관객의 문화사회적 배경과 경험에 따라서 일본 장편 애니메이션이 전달하고자 하는 주제와 메시지, 그리고 추구하는 신화에 대한 임의적 해석과 수용이 발생할 수도 있다. 의미작용에 있어서 그러한 해석과 수용의 폭넓은 가능성은 문제점이라기보다는 일본 장편 애니메이션이 가지고 있는 차별적인 표현과 소통의 특징으로 보는 것이 바람직할 것이다.

• 한국기계연구소 소보
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• 통권11호
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• pp.95-101
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• 1984

The MAU-series propellers were designed and tested in japan. This report presents the polynomial coefficients of open water Characteristics for each standard MAU-series propellers, obtained by multiple polynomial regression analysis in terms of pitch-diameter ratio and advance coefficient. The limitation of applicability and the accuracy of the regression polynomial are also discussed.

• 한국수학교육학회지시리즈A:수학교육
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• 제48권3호
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• pp.303-328
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• 2009

In this study, we developed the teaching methods using manipulative materials to teach regular polytopes, and applied these to first-year student of middle school who is attending the extra math class. In that class, we focused on the change of the mathematical representations -especially verval, visual and symbolic representations- and mathematical behavioral. By analyzing characterstics the students' work sheets, we obtained affirmative results as follows. First, manipulative materials played an important role on drawing a development figure of regular polyhtopes describing the verval representation definition of regular polytopes. Second, classes utilizing manipulative materials changed students verbalism level of representations the definition of regular polytopes. For example, in the first class about 60% of students are in the $0{\sim}2$ vervalism level, but in the third class, about 65% of students are in the $6{\sim}7$ level. Third, classes utilizing manipulative materials improved visual representation about development figure. After experiences making several development figures about regular octahedron directly, and discussion, students found out key points to be considered for draws development figure and this helped to draw development figures about other regular polytopes. Fourth, students were unaccustomed to make symbolic representations of regular polytopes. But, they obtained same improvement in symbolic representations, so in fifth the class some students try to make symbol about something in common of whole regular polytopes. Fifth, after the classes, we have significant differences in the students, especially behavioral characteristics in II items such as mind that want to study own fitness, interest, attachment, spirit of inquiry, continuously mathematics posthumously. This means that classes using manipulative materials. Specially, 'mind that want to study mathematics continuously' showed the biggest difference, and it may give positive influence to inculcates mathematics studying volition while suitable practical use of manipulative materials. To conclude, classes using manipulative materials may help students enhance the verbal, visual representation, and gestates symbol representation. Also, the class using manipulative materials may give positive influence in some part of mathematical behavioral characteristic. Therefore, if we use manipulative materials properly in the class, we have more positive effects on the students cognitive perspect and behavioral cteristics.

• 대한기계학회논문집
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• 제19권8호
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• pp.1901-1906
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• 1995

The frequency response functions of systems incorporating a non-linear cubic stiffness subject to sinusoidal excitation are derived using the Volterra series and the convergence characteristics investigated. It is shown that the series representation of the frequency response functions converges only when the sinewave input amplitude is within a certain range. Within the range of convergence the frequency response function based on the Volterra series approaches the analytical one as more higher order frequency response function terms are included. Proposed is a criterion for the studies systems to predict approximately the range of sinewave input amplitude for which the series representation of the frequency response functions converges.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제24권2호
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• pp.475-502
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• 2010

본 연구에서는 고등학교 1학년 113명을 대상으로 수학 문제 해결에서 표상 활용 능력을 학업성취도에 따라 분석하고, 학업성취도에 따른 표상 활용의 특징에 대하여 알아보았다. 이를 위해서 학생들에게 다양한 표상을 사용하여 해결할 수 있는 문제를 제시하고, 이를 최대 세 가지방법을 이용하여 풀도록 하였다. 또한 지필 평가의 비교분석 결과를 토대로 6명의 학생을 선발하여 인터뷰를 실시하고 학업성취도에 따라 표상 활용에 차이가 나는 원인을 분석해 보았다. 그 결과 상위권 학생들은 50%이상이 모든 문항에서 두 가지 이상의 표상을 활용해 문제를 해결하였지만, 중위권 학생들은 문항의 난이도에 따라 편차가 있었고, 하위권 학생들은 문제 해결에 표상을 다양하게 활용하지 못하였다. 표상 활용의 특징으로, 상위권 학생들은 수식사용을 선호하였고 문제 해결과정에서 수학적 기호를 효율적으로 사용하였다. 이에 반해 중 하위권 학생들은 표나 그림을 이용하는 경우가 대다수였고, 같은 표상 양식이라 할지라도 상위권 학생이 중 하위권 학생보다 더 구조적이고 세련되게 표현하고 있었다.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.674-679
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• 1994

Acoustic signal such as speech and scattered sound, are generally a nonstationary process whose frequency contents vary at any instant of time. For time-varying signal, whether a nonstationary or a deterministic transient signal, a traditional frequency domain representation does not reveal the contents of signal characteristics and may lead to erroneous results such as the loss of desired characteristics features or the mis-interpretation for a wrong conclusion. A time-frequency domain representation is needed to characterize such signatures. Pseudo Wigner-Ville distribution (PWVD) is ideally suited for portraying nonstationary signal time-frequency domain and carried out by adapting the fast Fourier transform algorithm. In this paper, the important properties of PWVD were investigated using both stationary and nonstationry signatures by numerical examples PWVD was applied to acoustic sigtnatures to demonstrate its application for time-ferquency domain analysis.