• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.258-258
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• 2004

전해 가공은 공작물의 기계적 특성과 무관하게, 빠른 속도로 가공할 수 있는 장점이 있으나, 가공 간극이 비교적 넓어 초정밀 가공에는 널리 적용되지 못했다. 최근 Schuster는 초단 펄스를 이용한 전해 가공으로 가공 간극을 수 $\mu\textrm{m}$ 까지 줄일 수 있고 미세 3차원 구조물의 정밀가공에 초단 펄스를 적용할 수 있음을 보였다. 본 논문에서는 초단 펄스를 이용한 미세 흠의 와이어 전해 가공에 대하여 연구하였다. 전극으로는 지름 10$\mu\textrm{m}$ 백금 와이어를 사용하였으며 공작물은 스테인리스 스틸을 사용하였다.(중략)

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.67-68
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• 2020

본 논문에서는 미세먼지 센서와 가스 센서를 이용한 효율적인 스마트 홈 기반 다중 센서 알림 시스템을 제안한다. 시스템은 여러 유형의 홈 센서를 이용하여 효율적으로 미세먼지와 실내의 가스를 탐지 후 실시간으로 애플리케이션을 통해서 사용자에게 탐지 결과를 알려주는 시스템이다. 본 시스템의 경우 기존에 존재하는 미세먼지 센서와 가스 센서를 적용한 측정 시스템에 비해 소액으로 최적의 시스템을 구축할 수 있다. 시스템은 기존의 가스 센서와 다르게 한 번에 다양한 종류의 가스를 탐지해 사용자에게 여러 정보를 제공할 수 있도록 개발하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.288-291
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• 2020

프로젝트는 4차 산업 주요 기술인 ICT, 임베디드 시스템을 사용하여 쾌적한 실내공기를 유지 관리하는 스마트 홈 모형을 제작하고 공기관리를 위해 미세먼지 및 공기질을 측정하는 센서, 공기질에 따른 공조 시스템을 제어하는 컨트롤러, 이를 모바일 기기 등을 이용하여 모니터링 및 제어할 수 있는 스마트 홈

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.952-954
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• 2022

본 연구에서는 스마트 홈 솔루션 IoT 허브 시스템의 하드웨어를 개발한다. IoT를 통해 스마트기기의 상태를 모니터링하다가, 특정 센싱값을 받으면 제어를 통해 스마트기기를 제어할 수 있도록 개발한다. 미세먼지 측정과 온습도를 조절하고, 가정 온도를 측정하여 전자제품의 전원을 조절하는 등 홈을 자동 제어하기 위한 소프트웨어도 함께 개발한다.

• Journal of the Korean Society for Precision Engineering
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• v.14 no.3
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• pp.28-34
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• 1997

The side burrs and shape distortion resulting from the micromachining of an array of V-shape microgrooves in fresnel lens mould were experimentally invesigated. The focus of this study is on the influence of depth of cut and prism angle on the burr growing rate. The main experiments were con- ducted on the single prism cutting for the convinient of measuring the burr shape and cutting force. From the observation of the burr shape and burr growing rate, it was found that there exits a critical depth of cut below which the burrs are more or less irregular and weak. But above that critical value, the burrs are re- latively clear and stiff.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2002.04a
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• pp.167-172
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• 2002

Recent years, optical components'are widely used in optical communication industry for high speed and mass storage data processing. Micro grooving of planar lightwave circuit and glass, those are widely used in optical component, are realized by polycrystalline diamond tool with ultrasonic vibration. To know the characteristics of brittle materials cutting, ultrasonic vibration cutting tool and machining system are built for the experiment. Grooving on planar lightwave circuit and glass experiments are performed and their shape are measured by photograph with microscope. It reveals that better groove shape with low chipping of planar lightwave circuit and glass are obtained by micro grooving machining with ultrasonic vibration. These experiments are considered as a possibility to the micro grooving of optical communication components.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.7
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• pp.1280-1287
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• 2002

The old technique of sandblasting which has been used for decoration of glass surface has recently been developed into a powder blasting technique for brittle materials such as glass, silicon and ceramics, capable of producing micro structures larger than $100{\mu}$ m. This paper describes the performance of powder blasting technique in micro-line grooving of glass and the effect of the number of nozzle scanning on the depth and width of line groove. Experimental results showed that increasing the no. of nozzle scanning resulted in the increase of depth and width in grooves. Increase of width which may cause several problems in the precision machining results from wear of mask film. Therefore, well-controlled masking process is the most important factor for micro machining of glass with accuracy.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.3
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• pp.34-40
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• 2003

This paper describes evaluation and monitoring methods of machining characteristics for developed micro grooving machine. Experiments were conducted under various process conditions such as spindle revolution speed, feed rates and depth of groove V and U shape of blade and STD11 were used in this experiment. The status of grooving was evaluated through analysis of the Acoustic emission (AE) signal resulted in each process condition. Based on the analysis, this paper examined the possibility of monitoring adapting fuzzy logic. In conclusion, this paper presented the possibility of monitoring in process adapting AE technology and appropriate micro grooving condition.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.12 no.4
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• pp.23-28
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• 2003

This paper describes the machining characteristics of a developed micro grooving machine. Experiments have been conducted on the various grooving condition such as spindle revolution speed, feed rate and depth of groove. V and U-shaped blade tool and STD11 workpiece was used in this study. To evaluate the developed micro grooving machine, AE signal obtained from each experimental condition was analyzed, and cutting stability was compared with the surface state. As a result this study presented the process to optimize grooving condition and possibility of application of AE technique in groove machining.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.987-992
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• 1997

Burrs always come out with the machining of ducterial with small size. Though the size of burrs is small, burrs dominate deterioration of the accuracy of the micro grooves. So the burr generation model especially side burr generation model was investigated to predict the size of the burrs at the given cutting conditions. The side shear plane is introduced to build the burr generation model and the width of side shear plane nomalized with cutting depth is defined with the shear angle. From the theoretical observation, the width of side shear plane can vary up 40% of the cutting depth. To determine the size of burr and stiffness, single groovings were carried out and it was found that there exist a critical depth of cut that the size or stiffness of the burr vary.