• 한국광학회지
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• 제34권1호
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• pp.13-21
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• 2023

입사하는 빛에 대한 수용각이 큰 인공 겹눈 구조를 제작하기 위해 마이크로 렌즈 어레이의 높이에 따라 곡면형 겹눈 구조체가 갖는 수용각과 이미징 특성을 분석하였다. 마이크로 렌즈의 반지름에 대한 높이인 h/r값을 조절함으로써 보다 큰 입사각을 갖는 빔이 마이크로 렌즈 어레이로 들어올 때도 여전히 빔을 포커싱하고 이미지를 맺을 수 있는 렌즈의 구조를 확인하였다. h/r값이 0.22에서 0.37로 증가할 때 겹눈 구조체의 수용각은 28.70°에서 49.02°로 증가하여 70.8%의 증가폭을 얻어낼 수 있었다. 뿐만 아니라 글자 F를 이미징한 결과, h/r값이 0.37일 때 메인 렌즈의 중심으로부터 23번째에 위치한 마이크로 렌즈에서도 글자가 선명하게 관찰되어 56.35°의 입사각을 갖는 빔에 대해서도 마이크로 렌즈 어레이가 이미지를 맺을 수 있음을 확인하였다.

• 기계저널
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• 제28권1호
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• pp.46-56
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• 1988

다음과 같은 결론을 얻었다. (1) 설문 응답자의 졸업년도, 학위, 담당업무별 분포조사로부터 연 구개발 및 설계업무 분야의 젊은 실무자급 의견이 대폭 수렴되고 있음을 알 수 있으며 최근 10 년간의 국내 기계공학교육에 대한 의견이 많이 반영되고 있다고 볼 수 있다. (2) 현 대학교육은 기초지식교육에 중점을 두고 있으며 이의 현장 활용도는 긍정적으로 받아들여지고 있으나 전 문지식교육을 위한 교육수준 향상이 요구되고 있다. 특히 실무현장에서 요청되는 메카트로닉스 및 생산관련 과목의 보강이 필요하며 졸업논문 및 설계의 실질적 운용과 재학중 현장실습의 효 율성 등이 재검토되어야겠다. (3) 이러한 요구를 수용하기 위해서는 교수, 시설, 실험실습 교 육의 확충을 위한 대학예산의 증가, 졸업학점제 등으로 대표되는 획일적 교육 행정의 개선, 신 기술 지식 및 현장응용성이 강한 응용과목 도입에 의한 교육내용의 보완, 프로젝트 과제화 및 세미나식 교육 등을 통한 교육방법의 재고 등이 선행되어야 한다. (4) 대학이 담당할 계속교육 및 산학협동의 요구가 증대되고 있는 실정이며 이를 위해서는 특정분야를 중심으로 한 실용성 높은 산학협동강좌의 적극적 개설 및 기업프로젝트 참여 등을 통한 현장문제 교육, 교육, 분석, 평가, 종보교환 등의 협의가 필요하며 대학의 산업체에 대한 적극적 관심과 산학협동을 위한 제도적 장치가 마련되어야겠다.

• 오토저널
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• 제22권2호
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• pp.100-108
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• 2000

• 기계저널
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• 제57권4호
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• pp.54-58
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• 2017

이 글에서는 한국기술교육대학교 메카트로닉스공학부에서 반도체 디스플레이장비 장비분야의 특성화된 인재를 양성하기 위하여 운영하는 지방대학 특성화사업(CK-I) 반도체 디스플레이장비 창의인재양성 사업단에 대해 소개하고자 한다.

• 반도체디스플레이기술학회지
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• 제20권4호
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• pp.177-181
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• 2021

Scaffolds protect the sensor in the body. Scaffolds are made of a bioabsorbable polymer. The polymer process is sensitive to humidity. Inside of the 3D printer has been improved to control the humidity. Specimens were produced by injection molding and 3D printer. 3D printed specimens were printed under various humidity conditions. We measured tensile strength of the injection-molded specimen and tensile strength of the 3d printing specimen. We compared tensile strength of the injection-molded specimen and tensile strength of the 3d printing specimen. Tensile strength of the injection-molded specimen is 557 kgf/cm². We confirmed tensile strength of the specimen was highest at 741 kgf/cm² when the humidity was 10 %. We confirmed lower the humidity, higher tensile strength of the polymer product.

• 반도체디스플레이기술학회지
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• 제19권4호
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• pp.28-33
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• 2020

Plasma etching process employs high density plasma to create surface chemistry and physical reactions, by which to remove material. Plasma chamber includes silicon-based materials such as a focus ring and gas distribution plate. Focus ring needs to be replaced after a short period. For this reason, there is a need to find materials resistant to erosion by plasma. The developed chemical vapor deposition processing to produce silicon carbide parts with high purity has also supported its widespread use in the plasma etch process. Silicon carbide maintains mechanical strength at high temperature, it have been use to chamber parts for plasma. Recently, besides the structural aspects of silicon carbide, its electrical conductivity and possibly its enhanced life time under high density plasma with less generation of contamination particles are drawing attention for use in applications such as upper electrode or focus rings, which have been made of silicon for a long time. However, especially for high purity silicon carbide focus ring, which has usually been made by the chemical vapor deposition method, there has been no study about quality improvement. The goal of this study is to reduce surface roughness and depth of damage by diamond tool grit size and tool dressing of diamond tools for precise dimensional assurance of focus rings.

• 반도체디스플레이기술학회지
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• 제20권1호
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• pp.99-103
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• 2021

Warpage defect detecting of scaffold is very important in biosensor production. Because warpaged scaffold cause problem in cell culture. Currently, there is no detection equipment to warpaged scaffold. In this paper, we produced detection model for shape warpage detection using deep learning based CNN. We confirmed the shape of the scaffold that is widely used in cell culture. We produced scaffold specimens, which are widely used in biosensor fabrications. Then, the scaffold specimens were photographed to collect image data necessary for model manufacturing. We produced the detecting model of scaffold warpage defect using Densenet among CNN models. We evaluated the accuracy of the defect detection model with mAP, which evaluates the detection accuracy of deep learning. As a result of model evaluating, it was confirmed that the defect detection accuracy of the scaffold was more than 95%.

• 반도체디스플레이기술학회지
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• 제21권2호
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• pp.68-73
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• 2022

In this study, we produced the surface defect detection model to automatically detect defect bone plates using a deep learning algorithm. Bone plates with a width and a length of 50 mm are most used for fracture treatment. Normal bone plates and defective bone plates were printed on the 3d printer. Normal bone plates and defective bone plates were photographed with 1,080 pixels using the webcam. The total quantity of collected images was 500. 300 images were used to learn the defect detection model. 200 images were used to test the defect detection model. The mAP(Mean Average Precision) method was used to evaluate the performance of the surface defect detection model. As the result of confirming the performance of the surface defect detection model, the detection accuracy was 96.3 %.

• 반도체디스플레이기술학회지
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• 제21권2호
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• pp.19-24
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• 2022

The purpose of this research is to determine the hardness of guide hole. A guide pin and a guide hole of SSD(Solid State Drive) tester used to mount SSD in a fixed position accurately. The guide pin and guide hole are worn by friction due to repeated operation, and the wear is concentrated on the guide hole made of weak material rather than the guide pin made of relatively strong material. Because of that reason, it is often overdesigned in the design stage because it can lose its function. If the guide hole is made soft, the manufacturing cost will decrease, but the accuracy will decrease due to wear caused by repeated friction. If the guide hole is manufactured excessively, the manufacturing process becomes complicated and the manufacturing cost increases. It is essential to design a guide hole, but since there is no standard or verified data that can be referenced, it is difficult to design. Experimental device which guides in the same way as the SSD tester is used for this research, and three types of anodizing state are experimented for different hardness. Also, weight of COK(Change over Kit) were analyzed by measuring the wear amount and state of the guide hole according to the number of repeated attachment and detachment.

• 반도체디스플레이기술학회지
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• 제21권1호
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• pp.103-107
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• 2022

Scaffolds are the structures that safely protect sensors in various parts of the body. Because of scaffolds must protect sensors from load, the tensile strength of the scaffolds must be higher than 750 kgf/cm². Currently, the tensile strength of scaffolds made with the 3d printer is 714 kgf/cm². We confirm that the tensile strength of the scaffolds increase using air with high nitrogen concentration. In this study, we conducted experiments to find nitrogen concentrations in which the tensile strength of the specimen is higher than 750 kgf/cm². The nitrogen control device and the nitrogen concentration sensor were installed in the chamber type 3d printer. The nitrogen concentration inside the 3d printer was changed by 5 % from 80 % to 100 %. Specimens of ASTM D 638 standard were produced under changed nitrogen concentration. We measured the tensile strength of specimens. We compared the tensile strength of specimens produced under each nitrogen concentration. We confirmed that when air with nitrogen concentration of 90 % was used, the tensile strength of scaffolds were 762 kgf/cm².