• 제목/요약/키워드: Distortion of the form

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열영상 광학계용 비구면 렌즈 제작 (Manufacture of Aspheric Lens Using Thermal Image Optics)

  • 김대중;구할본;김상석;김정호
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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    • pp.191-194
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    • 2003
  • Through using aspheric lens can result in advantages such as an improved optical transfer function, a reduced distortion path or the realization of special image field curvatures. Using the diamond turning method for generating aspherics, the company claim to be able to generate surfaces with a form error of less than $0.33\;{\mu}\;m$ and a surface roughness of less than $0.025\;{\mu}\;m$. In this paper, we are manufacturing thermal image aspheric lens. Thermal image system is electro-optical imaging device which can make visible the difference of infrared energy naturally emitted by objected. In the result of aspherical surface, the form accuracy of about $0.24\;{\mu}\;m$ P-V was obtained and the surface roughness Ra $0.004\;{\mu}\;m$. Also, a brief review of Ultra-precision system Korea photonics technology institute(KOPTI) is present in this paper.

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생성적 디자인을 이용한 가구디자인의 특성에 관한 연구 - 프랙탈 기하학과 보로노이 다이어그램을 적용한 가구디자인을 중심으로 - (A Study on the Characteristics of Furniture Design Using Generative Design - Focus on the Furniture Design using Fractal Geometry and Voronoi Diagram -)

  • 이진욱
    • 한국실내디자인학회논문집
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    • 제20권1호
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    • pp.89-97
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    • 2011
  • Furniture design is no exception to human desire for pursuit of the nature. In various design fields, it has turned out nature-decorative method in the past, and also recently it has turned out bio-adaptive method which is more root design process using principal of generation in nature world. The purpose of this study is to analyze application methods and characteristics of fractal geometry and voronoi diagram which are most representative principals of generative design in nature by research on the example of furniture design using these principals. The results of having analyzed fumitures by generative design can be summarized as follows; design principals of fractal; superposition, scaling, repetition & gradation, deformation, distortion and voronoi diagram; individual speciation, variational patten, repetition gradation, ambiguous boundary create new design concept and emergent form in furniture design. Application methods are 'form emergence by algorithm', 'conventional process based on principals of generative design', and 'reproduction of pattern from generative design'. Biological reinterpretations and new explorations of principals of nature generation offer unbounded possibilities for furniture design.

패션 필름 유형에 따른 스토리텔링 특징 연구 (A Study on Characteristics of Storytelling by Fashion Film Categorization)

  • 김지예;서승희
    • 패션비즈니스
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    • 제21권4호
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    • pp.1-20
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    • 2017
  • Fashion film has become a significant communication medium in the $21^{st}$ century. Fashion film, that tells unique quality stories, is a means of communicating brand value emotionally. To examine characteristics of storytelling according to types of fashion film, this study categorizes fashion film and investigates storytelling elements in terms of content, form, and communication. For methodology, a literature review was conducted to examine the concept of storytelling and types of fashion film storytelling. Empirical research was conducted on 32 fashion films from 2007 to recent years of 2017. Results are as follow. First, theatrical fashion film, based on linear narrative structure and closed-ending, is characterized content-based storytelling. Second, avant-garde fashion film, based on unconventional and experimental cinematic techniques, is characterized form-based storytelling. Finally, documentary fashion film that minimizes distortion and reproduces reality of designers' originality, refers to interactive communication-based storytelling which using digital technologies.

구면 파노라마 영상에서의 딥러닝 기반 객체 인식 (Deep Learning Based Object Recognition in Spherical Panoramic Image)

  • 정민석;박종승
    • 한국게임학회 논문지
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    • 제18권5호
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    • pp.5-14
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    • 2018
  • 영상 인식 기술은 평면 영상에 대해서 많이 연구되고 그 성능 또한 발전하고 있다. 그러나 평면 영상이 아닌 구면 파노라마 영상과 다양한 환경에서 주어지는 특수한 형태의 영상에 대한 인식은 평면과 다르게 기하학적인 왜곡으로 인해서 많은 어려움이 따른다. 본 논문에서는 평면 영상의 인식 기술에서 최근 각광받는 훈련을 통한 신경망 인식 기법이 구면 파노라마 영상의 인식에서도 쓰일 수 있음을 보인다. 또한 구면 영상에 대한 기존 신경망 모델의 인식률을 높이기 위해서 큐브맵 변환을 활용하는 방법을 제시한다.

A New Cascaded Multilevel Inverter Topology with Voltage Sources Arranged in Matrix Structure

  • Thamizharasan, S.;Baskaran, J.;Ramkumar, S.
    • Journal of Electrical Engineering and Technology
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    • 제10권4호
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    • pp.1552-1557
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    • 2015
  • The paper unleashes a new idea to arrive at reduced switch count topological structures configured in the form of a matrix for a cascaded Multi level inverter (CMLI). The theory encircles to minimize the number of switches involved in the conduction path and there from acclaim reduced input current distortion, lower switching losses and electromagnetic interference. The focus extends to standardize the number of power devices required for reaching different levels of output voltage from the same architecture. It includes appropriate pulse width modulation (PWM) strategy to generate firing pulses and ensure the desired operation of the power modules. The investigative study carries with it MATLAB based simulation and experimental results obtained using suitable prototypes to illustrate the viability of the proposed concept. The promising nature of the performance projects a new dimension in the use of single phase MLIs for renewable energy related applications.

피복(被覆) Arc용접(熔接)으로 Butt이음된 사각평판(四角平板)의 용접변형(熔接變形) (Welding Distortions on Rectangular Butt Welded Plate by Shielded Metal Arc Welding Process)

  • 박종은;임상전;윤봉섭
    • 대한조선학회지
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    • 제17권2호
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    • pp.21-32
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    • 1980
  • The welding distortions, transverse shrinkage and angular change, on the butt welded joint made by the process of shielded metal arc welding, were studied on the basic study of bead on plate weld. On the study of bead on plate weld, the temperature distribution on the plane normal to the direction of the weld line was assumed to be parabolic. The form of the distortion formulas of welded joint for transverse shrinkage and angular change were derived theoretically. Also, the experiments were performed about three cases, for changing type, sizes of welding electrodes and types of grooves, welding on mild steel plate, to compare theoretical study and experiments. It was found that the theoretical study was in good agreement with the result of experiment. Also, the optimal welding conditions for reducing weld distortions were suggested.

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벌크헤드 플레이트가 부착된 강바닥판교의 피로상세 개선 연구 (A Study on Improvement of fatigue Details in Orthotropic Steel Deck Bridge with Bulkhead Plate)

  • 공병승
    • 한국해양공학회지
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    • 제18권1호
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    • pp.22-27
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    • 2004
  • An orthotropic steel deck system is widely adapted form for a long-span bridge. It has many advantages, such as the big reduction of dead weight, the simplicity for erection, and the reduction of the construction period. However, an orthotropic steel deck system requires a lot of welding work, which may result in defects and deformation of connection. Therefore, the research for the general behavior and fatigue strength of the several details in orthotropic steel deck bridge is necessary. The fatigue failure with distortion results from secondary stress by out-of-plane deformation; these kinds of cracks are very difficult to measure, and can not be precisely calculated through finite element analysis. This stress concentration phenomenon generates the fatigue failure around the lower scallop of the transverse rib. This paper presents improved details of the intersection between the longitudinal rib and the transverse rib of an orthotropic steel deck bridge by the third dimensional hit size test, and the finite element method, which can minimize local stress through parametric study.

Modeling of Power Networks by ATP-Draw for Harmonics Propagation Study

  • Ali, Shehab Abdulwadood
    • Transactions on Electrical and Electronic Materials
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    • 제14권6호
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    • pp.283-290
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    • 2013
  • This paper illustrates the possibilities of using the program ATP-Draw (Alternative Transient Program) for the modeling of power networks to study power quality problems with highly detailed analyses. The Program ATP-Draw is one of the most widespread and oldest programs. A unique characteristic of this program is its public domain and the existence of forums and study committees where new application cases and modification are presented and shared publicly. In this paper, to study the propagation of harmonics through a power network, a part of an industrial power network was modeled. The network contains different types of electric components, such as transformers, transmission lines, cables and loads, and there is a source of harmonics that injects $3^{rd}$, $5^{th}$, $7^{th}$, $9^{th}$ and $11^{th}$ harmonic currents into the network, causing a distortion of the wave form of the currents and voltages through the power network.

현대 예술의상에 표현된 데포르마숑 이미지 (Deformation Image Expressed in the Modern Art to Wear)

  • 서승미
    • 복식
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    • 제55권7호
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    • pp.38-50
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    • 2005
  • The purpose of this study is first, to see through the aesthetic essence of the clothing as art, through theoretical consideration of cultural feature and body style in Postmodern Feminism. Also, this study will examine the aesthetic value in artistic meaning regarding a Deformational body image in visual an. Second, this study will analysis the formative character of Modern Art to wear which expressed unfixed body style, followed by the change of Postmodern Feminity, as a Deformation image. This character will be categorized by Expansion, Grotesque, Pleasure, and Virtuality. The following is the result of this study. Expansion expressed in modern Art to wear created intentional structure of the form, and intentionally presented refusal of body existence through disembodied. Grotesque expressed refusal and deviation of women's ideal body style, which is defined by mannish discourse, very grotesquely. Pleasure pleasantly presented free emotion through an intentional transformation like distortion or imbalance of the body By paradoxically reproducing women's virtual body as other unfixed female identity was expressed visually through virtuality to embody post-gender.

광 연상 기억 장치를 이용한 한글 문자 인식 (Korean Character Recognition Using Optical Associative Memory)

  • 김정우;배장근;도양회
    • 전자공학회논문지A
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    • 제31A권6호
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    • pp.61-69
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    • 1994
  • For distortion-invariant recognition of Korean characters, a holographic implementation of an optical associative memory system is proposed. The structure of the proposed system is a single-layer neural network employing interconneclion matrix, thresholding and feedback. To provide the interconnection matrix, we use two CGII's which are placed on intermcdiate plane of cascaded Vander Lugt corrclators to form an optical memory loop. The holographic correlator stores reference images in a hologram and retrives them in a coherently illuminated feedback loop. An input image which maybe noisy or incomplete, is applicd to the system and simultaneously correlated optically with all of the stord images. These correlations are throsholed and fed back to the input, where the strongest correlation reinforces the input image. The enhanced image passes arround the loop repeatedly, approaching the stored image more closely on each pass until the system stabilizes on the desired image. The computer simulation results show that the proposed Korean Character recognition algorithm has high discrimination capability and noise immunity.

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