• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.184-185
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• 2008

Modal analysis is an important and essential process in design of a high speed machining center. Generally, modal analysis of a built-in spindle system has not taken the work piece's shape and dimension into consideration. Since small and long work pieces influence greatly the natural frequency of the entire system, the high speed spindle system which continuously makes small machine parts by long work pieces for improvement of machining time has to consider the machining work pieces. Therefore frequency characteristics of the spindle system with long work pieces are studied in this paper.

• 한국정밀공학회지
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• 제26권11호
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• pp.99-107
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• 2009

Since a long work piece influences the natural frequency of the entire system with a miniature high speed spindle, a bar-feeder is used for a long work piece to improve the vibration characteristics of a spindle system. Therefore, it is very important to design optimally support positions between a bar-feeder and a long work piece for a miniature high speed spindle system. The goal of the current paper is to present an optimization method for the design of support positions between a bar-feeder and a long work piece. This optimization method is effectively composed of the method of design of experiment (DOE), the artificial neural network (ANN) and the genetic algorithm (GA). First, finite element models which include a high speed spindle, a long work piece and the support conditions of a bar-feeder were generated from the orthogonal array of the DOE method, and then the results of natural vibration analysis using FEM were provided for the learning inputs of the neural network. Finally, the design of bar-feeder support positions was optimized by the genetic algorithm method using the neural network approximations.

• Journal of the Optical Society of Korea
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• 제3권2호
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• pp.74-79
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• 1999

We present a simple design rule for a passive temperature-compensating optical package. We also present experimentally that a package fabricated by using the design rule compensates the temperature dependence of the resonant wavelength of an optical long period fiber grating by varying the strain inside the fiber, The package fabricated in this work consists of two pieced of brass tube, 10 mm long, and a piece of nylon rod, 45.4 mm long. It is shown that the package can compensate the temperature-induce wavelength shifts of the long period grating to a range of 6.8 pm/$^{\circ}C$, compared with 0..48 nm/$^{\circ}C$ for an uncompensated grating. The reduced strength of the fiber caused by exposure to ultraviolet limits the performance of the package to the range operating temperature form -3 $^{\circ}C$ to 7$0^{\circ}C$.

• 한국정밀공학회지
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• 제23권8호
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• pp.195-202
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• 2006

High-speed machining (HSM) with excellent quality and dimensional accuracy has been widely used to create 3D structures of metal and plastics. However, the high-speed machining process is not suitable for the rapid realization of 3D thin-walled product because it consumes considerably long time in fixturing process of a work piece. In this paper, an effective rapid manufacturing process is proposed to fabricate 3D thin-walled products directly using HSM, phase change filling and ultrasonic welding. The filling process is useful to hold the thin-walled product during the machining step. The ultrasonic welding process is introduced to make one piece product from two piece parts that are machined by HSM and filling process. The proposed rapid manufacturing (RM) process has been shown that the RM process enables to fabricate the 3D thin-walled products using ABS plastics and aluminum metals from 3D CAD data to functional parts.

• 만화애니메이션 연구
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• 통권40호
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• pp.1-31
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• 2015

서구 유럽 및 일본애니메이션에 비해 짧은 역사를 지닌 한국 애니메이션은 1950년대 후반 광고애니메이션과 문화영화의 일환으로 제작된 비상업용 단편애니메이션으로 출발하였다. 1960년대 영화법과 문화정책이 투영된 문화영화 애니메이션은 한국애니메이션의 역사에서 거의 언급되지 않고 있지만, 극장용 장편애니메이션 이전에 제작된 귀중한 문화 창작물이다. 특히 15초 내외의 짧은 CF애니메이션에 비해 4분에서 10분 내외의 단편애니메이션으로 그 당시 한국애니메이션의 수준을 가늠할 수 있는 사료적 가치가 있는 작품들이다. 1960년대에 20여편의 단편애니메이션이 제작 되었으며, 주로 근대화 정책추진과정에서 국민들을 계몽하기 위한 교육 내용을 담고 있다. 국립영화제작소에서 문화영화로 제작된 단편애니메이션은 셀을 활용한 카툰애니메이션 이외에도 페이퍼애니메이션, 퍼핏애니메이션도 제작되었다. 이러한 배경에서 본 논문은 1960년대에 국립영화제작소에서 제작된 단편애니메이션에 주목해보고자 한다. CF 이외에 초기 단편애니메이션의 연구가 거의 없는 상태에서 작품의 발굴과 분석은 의미 있는 일이라 생각하며, 이 창작과정에 참여했던 박영일감독, 한성학감독, 정도빈감독, 신동헌감독, 넬슨신감독 등이 이후 극장용 애니메이션 감독으로 활동하였기에 그 작품에 대한 분석은 한국애니메이션을 이해하는 중요한 기반 연구가 될 것이라고 본다. 논문에서는 국립영화제작소 창설의 시대적 상황 및 1960년대 국립영화제작소에서 창작된 단편애니메이션 중 감독 등 참여인력을 확인할 수 있는 10편의 작품을 중심으로 서사적 의미와 조형적 특징을 연구해보고자 한다. 이를 통해 그간 한국애니메이션역사 연구에서 간과된 비상업적 단편애니메이션에 대한 고찰과 향후 한국애니메이션사에 대한 보다 풍부한 연구가 진행되는 단초를 마련해보고자 한다.

• 조형예술학연구
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• 제8권
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• pp.45-61
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• 2005

2D 애니메이션 영상은 평면적으로 제작되어지는 영상작품이기 때문에 그러한 문제를 카메라 움직임과 배경으로 입체적 효과로 실재적 느낌을 재현하기 위해서 카메라 움직임을 사용한 작화기법으로 표현하였다. 미국 초창기 디즈니 애니메이션에서는 모든 멀티적 효과를 그림으로 실재적으로 표현하였지만 일본에서는 60년대 TV시리즈 작품을 제작하면서 리미티드 애니메이션의 새로운 기술적 표현을 위해 애니메이션에서 경제적인 작화표현과 영상의 깊이를 제공하고자 Follow Pan의 표현을 깊이 사용되어지고 이젠 미국에서도 적극 표현되어지고 있다. 본 연구는 카메라 움직임인 Follow Pan을 통해서 표현되어진 일본 장편작품을 예를 들어 실재적 접근에 적용된 사례를 분석하였다.

• 한국전자거래학회지
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• 제12권3호
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• pp.235-249
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• 2007

워크플로우 시스템은 긴 주기의 프로세스의 실행을 통제하는 소프트웨어 시스템이다. 조직의 구성원들이 프로세스의 실행을 담당하는데, 프로세스의 특정 부분을 누가 수행하는가를 결정하는 작업할당 정책이 워크플로우 시스템에 설계 및 구현되어 있어야한다. 여러 조직들의 작업할당에는 매우 다양한 문제들이 있을 수 있어서, 다양한 여러 문제들을 다 포괄하는 하나의 모델을 고안하는 것은 가능하지 않을 것이다. 본 논문에서는 워크플로우 시스템에서의 작업할당 정책에 대한 보편적인 설계 방법으로서, 각 조직에 주어진 임의의 고려할 사항들에서부터 작업할당 정책들을 정의하기 위한 메타 모델 기반 접근 방법을 제시한다.

• Journal of Mechanical Science and Technology
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• 제19권8호
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• pp.1576-1581
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• 2005

Generally, the optical components are fabricated by grinding, lapping, and polishing. And, those processes take long time to obtain such a high surface quality. Therefore, in the case of large optical component, the on-machine inspection (OMI) is essential. Because, the work piece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm method for measuring surface profile of large optical concave mirror. The measuring accuracy and uncertainty for suggested method are studied. The experimental results show that this method is useful specially in lapping process with the accuracy of $3\~5\;{\mu}m$. Those inspection data are provided for correcting the residual figuring error in lapping or polishing processes.

• 한국정밀공학회지
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• 제19권12호
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• pp.163-170
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• 2002

The quality of a precision product, in general, relies on the accuracy and precision of its manufacturing and inspection process. In many cases, the level of precision in the manufacturing and inspection system is also dependent on the positioning capability of tool with respect to the work piece in the process. Recently the positioning accuracy level has reached to the level of submicron and long range of motion is required. For example, for 1 GDARM lithography, 20nm accuracy and 300mm stroke needs. This paper refers to the lithography stage especially to fine stage. In this study, for long stroke and high accuracy, the dual servo system is proposed. For the coarse actuator, LDM (Linear DC Motor) is used and for fine one VCM is used. In this study, we propose the new structure of VCM for the fine actuator. It is 3 axis precision positioning stage for an aligner system. After we perform the optimal design of the stage to obtain the maximum force, which is related to the acceleration of the stage to accomplish throughput of product. And we controlled this fine stage with TDC. So we obtained 50nm resolution. So later more works will be done to obtain better accuracy.

• 한국의류산업학회지
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• 제5권5호
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• pp.443-452
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• 2003

People have been getting interested in the Orientalism and it has come up in various areas due to scientific progress. I designed uniforms, which was simple and western, to show its symbolic meanings in the Orientalism. And I have been trying to generalize uniforms with originality and beauty. I have studied the process of the Orientalism and its changes and transitions, concepts and origins in history. And I applied the styles of Korean, Japanese and Chineses costume on it. I also referred to characters of uniforms, which already had images of Korea, Japan and China. Firstly, Korean styles have a contrast in colors by application of Taegeuk. And they gave lines with dark colors in black one-piece dress. This makes people who are wearing looking slimmer. White ramie top looks fresh and Korean traditional tie called Maedeup is set up for button. Secondly, Japanese styles were mainly Kimono style, one piece. They changed into two pieces designed to be active. So, it has emphasized the image of Kimono with Obi at the waist. Thirdly, Chinese styles basically are Chipao style, which has a Chinese collar and a long skirt, which has opening. But they gradually changed into short skirts and more open in the chest. For one of them, they gave lines in the side of chest, sleeves and skirt to be more natural. The costumes have kept their positions as a part of mass society that grows and changes with speed. And oriental uniforms are not just uniforms any longer only for work. It is quite symbolic like a 'second face' as it represents images for their countries and enterprises.