• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.562-568
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• 2000

분산 가상 현실 시스템에서는 네트웍크상에서 분산되어 있는 다수의 사용자들에게 하나의 공통된 가상 공간 객체를 제공하고 있다 이러한 가상 공간에서 다수의 사용자들은 상호작용을 자유롭게 실시간으로 하여야 할 뿐만 아니라 객체들을 공유공간 내에서 결합하거나 추가,삭제, 검색 등을 안전하게 수행해야 한다. 본 논문은 웹상에서 다중 사용자들이 원하는 특정 이미지나 텍스트 등을 실시간으로 안전하게 처리될 수 있는 모델을 제안하고 이를 반도체 레이져 마킹 시스템에 적용시켜 보았다.

• Journal of the Korean Society for Precision Engineering
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• v.10 no.3
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• pp.231-238
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• 1993

Mold-marking industries currently demands to reduce the tooling costs and time in mold making and to improve the productivity and quality in injection molding process. These problems can be easily solved by the laminated injection mold which is made by laser cutting metal sheets and bonding them by the brazing. Comparing with the conventional mold making technology which mainly depends on the machining, the new thchnology enables an arvitary design of cooling circuit whithout any restrictions of geometry. Therefore, it will offer high production tata of the injection molding processes. This paper evaluates the conventional and laminated injection mold making processes with a simple molding geometry, and also the cooling efficienty of the kinds of mold with the filling and cooling analyses. The results show that the laminated injection mold process takes much shorter time in tooling and cooling, and distributes temperatures more uniformly than the conventional one.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3178-3180
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• 2000

In this thesis, a controller which is appropriate for uses of scanner with small error and high speed response is proposed. Recently the application field of scanner is on increase. In case of applying to laser marking, the error of scanner has bad effect to quality. Also it can make difficulties in applying laser show that makes images, unless the high speed response is not realized. For these reasons, a controller that can adjust error and response is need. Because scanner must respond to step input that is put between a few millisecond and hundreds of microsecond with small revolution angle ranges, it is advantageous to have small inertia and large torque. First, the property of scanner is treated, and then using Op-amp and passive components and applying feedback compensation PID controller to design, the effects by controller coefficients are introduced.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.52 no.1
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• pp.35-41
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• 2003

In this paper, a machine vision system for recognizing and classifying the patterns and marks engraved by die molding or laser marking on the glass panels of computer monitors is suggested and evaluated experimentally. The vision system is equipped with a neural network and an NGC pattern classifier including searching process based on normalized grayscale correlation and adaptive binarization. This system is found to be applicable even to the cases in which the segmentation of the pattern area from the background using ordinary blob coloring technique is quite difficult. The inspection process is accomplished by the use of the NGC hypothesis and ANN verification. The proposed pattern recognition system is composed of three parts: NGC matching process and the preprocessing unit for acquiring the best quality of binary image data, a neural network-based recognition algorithm, and the learning algorithm for the neural network. Another contribution of this paper is the method of generating the training patterns from only a few typical product samples in place of real images of all types of good products.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.03b
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• pp.12-12
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• 2010

The hall probe measurement system was used to measure the critical current distribution of superconducting coated conductor. The system consists of reel to reel moving apparatus, 7 array hall probe, a rotary encoder and permanent magnet. The magnetic field profile across the width of superconducting coated conductor using Bean's critical state model was calculated. The effect of various parameters of the formulas on the magnetic field distribution and the effect of shape and size of artificial defects, which were formed on the surface of SmBa2Cu3O7-d(SmBCO) coated conductor using laser marking system, on the hall probe magnetic field signal of the hall probe measurement system was investigated.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.99.2-99
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• 2002

Contents 1 In this paper a machine vision system for recognizing and classifying the patterns and marks engraved by die molding or laser marking on glass panel of computer monitor is suggested and evaluated experimentally. The vision system is equipped with a neural network based pattern classifier and searching process based on normalized grayscale correlation and adaptive binarization, which is applicable to the cases in which the segmentation of the pattern area from background using the ordinary blob coloring technique is quite difficult. Inspection process is accomplished via the way of NGC hypothesis and ANN verification. The proposed pattern recognition system is composed of three...

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.488-490
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• 2010

Recently demand for the titanium material has been increasing continuously, and the titanium material is being applied to various fields these days. Especially, in the jewelry filed, the diamond set titanium jewels begin to appear. In this paper, the authors introduce advanced material titanium jewels by various expression techniques and propose the wedding jewel design using titanium material, practical and 'ECO-Steel'.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.273-276
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• 2001

본 논문에서는 레이져 마킹용 갈바노미터의 구동을 위하여 마킹에 필요한 벡터 폰트의 개발환경 구축하고, 만들어진 벡터 폰트를 PC와 구동 장치간의 통신용 인터페이스를 제작하여 갈바노미터(galvanometer)에 송신, 출력할 수 있도록 하였다. 벡터 폰트의 곡선 처리는 베지어(Bezier) 함수를 사용한 외곽선 폰트(outline pent)를 사용하였다. 폰트 에디터를 이용하여 문자를 작성한 후 문자의 외곽선 정보를 인터페이스 카드에 보내고, 이 데이터를 D/A 변환기를 통해 갈바노미터 구동장치를 구동하고, 레이져를 갈바노미터 반사경에 조사하여 폰트를 출력할 수 있도록 하였다. 인터페이스 카드는 16비트 D/A변환기를 이용하여 PC의 ISA버스를 이용하였다. 실험을 통해 개발된 장치의 구동이 올바르게 동작함을 확인하였다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.113-115
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• 2003

우리가 타자기로 글을 쓸 때는 먹지리본을 햄머가 가격하여 종이 위에 글씨 청태의 먹이 묻는 원리로 진행된다. 이러한 원리를 미세 패터닝에 응용하여, 해머 역할을 하는 Nd-YAG 레이저로 유리기판/100nm Cr(먹지)// 실리콘기판 (종이) 구조의 적충물에 조사시켜 Cr이 실리콘기판 위에 전사됨으로써 미세 패터닝이 가능한지 확인하였다. 제안된 미세 패터닝은 TeraBit/in²급 고밀도 정보저장 또는 반도체 공정의 생산성 향상을 위해 응용이 가능하다. 선폭 50 ㎛급 레이저를 주사속도 200과 1500 ㎜/s, Q스위치 조건을 10,000～50,000 ㎐로 변화시키며 마킹을 실시한 결과 Cr의 전사는 진행되지 않았으나, 최종적으로 입사 선폭의 33％ 이하로 마킹이 가능하여 비싼 광학계를 가진 레이저를 대치하여 보다 정말한 마킹이 가능함을 확인하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.456-456
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• 2009

Boron doping on an n-type Si wafer is requisite process for IBC (Interdigitated Back Contact) solar cells. Fiber laser annealing is one of boron doping methods. For the boron doping, uniformly coated or deposited film is highly required. Plasma enhanced chemical vapor deposition (PECVD) method provides a uniform dopant film or layer which can facilitate doping. Because amorphous silicon layer absorption range for the wavelength of fiber laser does not match well for the direct annealing. In this study, to enhance thermal affection on the existing p-a-Si:H layer, a ${\mu}c$-Si:H intrinsic layer was deposited on the p-a-Si:H layer additionally by PECVD. To improve heat transfer rate to the amorphous silicon layer, and as heating both sides and protecting boron eliminating from the amorphous silicon layer. For p-a-Si:H layer with the ratio of $SiH_4$ : $B_2H_6$ : $H_2$ = 30 : 30 : 120, at $200^{\circ}C$, 50 W, 0.2 Torr for 30 minutes, and for ${\mu}c$-Si:H intrinsic layer, $SiH_4$ : $H_2$ = 10 : 300, at $200^{\circ}C$, 30 W, 0.5 Torr for 60 minutes, 2 cm $\times$ 2 cm size wafers were used. In consequence of comparing the results of lifetime measurement and sheet resistance relation, the laser condition set of 20 ~ 27 % of power, 150 ~ 160 kHz, 20 ~ 50 mm/s of marking speed, and $10\;{\sim}\;50 {\mu}m$ spacing with continuous wave mode of scanner lens showed the correlation between lifetime and sheet resistance as $100\;{\Omega}/sq$ and $11.8\;{\mu}s$ vs. $17\;{\Omega}/sq$ and $8.2\;{\mu}s$. Comparing to the singly deposited p-a-Si:H layer case, the additional ${\mu}c$-Si:H layer for doping resulted in no trade-offs, but showed slight improvement of both lifetime and sheet resistance, however sheet resistance might be confined by the additional intrinsic layer. This might come from the ineffective crystallization of amorphous silicon layer. For the additional layer case, lifetime and sheet resistance were measured as $84.8\;{\Omega}/sq$ and $11.09\;{\mu}s$ vs. $79.8\;{\Omega}/sq$ and $11.93\;{\mu}s$. The co-existence of $n^+$layeronthesamesurfaceandeliminating the laser damage should be taken into account for an IBC solar cell structure. Heavily doped uniform boron layer by fiber laser brings not only basic and essential conditions for the beginning step of IBC solar cell fabrication processes, but also the controllable doping concentration and depth that can be established according to the deposition conditions of layers.