• 월간포장계
• /
• 통권279호
• /
• pp.48-51
• /
• 2016

• 한국광학회:학술대회논문집
• /
• 한국광학회 1997년도 Advance Program of 14th optics andquantum Electronics conference, 1997제14 회 광학 및 양자전자 학술 발표회 논문 요약집
• /
• pp.98-98
• /
• 1997

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2000년도 춘계학술대회
• /
• pp.35-35
• /
• 2000

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2000년도 춘계학술대회
• /
• pp.36-36
• /
• 2000

• 제어로봇시스템학회논문지
• /
• 제10권4호
• /
• pp.304-311
• /
• 2004

In this paper we present a technique of discrete-time sliding mode controller design for assigning eigenvalues of sliding mode and determining a convergence rate to sliding surface. First the sliding mode coefficient is designed via Ackermann s formula. Then a linear controller is designed to enforce sliding mode such that the resulting closed loop yields the desired eigenvalues. As we use a linear control instead of nonlinear control, chattering is nearly eliminated. Simulation and experimental results are included to show the effectiveness of the proposed method for Laser Marking System.

• 소성∙가공
• /
• 제15권4호
• /
• pp.319-325
• /
• 2006

The laser forming process is a new flexible forming process without forming tools and external force, which is applied to various fields of industry. Especially, applications of the laser forming process focused on cutting, welding and marking process. In this paper, the laser bending process of sheet metal which is heated by laser beam and formed by internal stress is simulated by using thermo elastic-plastic analysis model. Based on the result of FE-analysis, the laser bending machine is made to obtain reliable data for sheet bending. Under the same condition as FE-analysis, the laser bending experiment has been performed to ver 펴 the result of FE-analysis and good agreement has been obtained between FE-analysis and experiments. Additional laser bending experiments have been performed to evaluate the laser bending machine.

• 디지털융복합연구
• /
• 제20권2호
• /
• pp.353-359
• /
• 2022

4차 산업혁명시대에 접어들어서 차별화 된 라이프 스타일로 인간은 아름다움을 추구하고 삶의 질이 향상 될수록 네일아트는 미용과 장신구 예술의 한 부분으로써 또 다른 예술 분야로 각 광 받고 있다. 또한 최근 급속히 성장하고 디지털시스템화 된 장식적 미용 네일 산업이 세계의 주요 산업의 자리 잡으면서 창의적이고 독창적인 장식 표현을 요구하는 조형미용 예술로 표현되고 있다. 최근 급속히 성장하고 디지털시스템화 된 장식적 미용 네일 산업이 세계의 주요산업의 자리 잡으면서 창의적이고 독창적인 장식 표현을 요구하는 조형미용 예술로 표현되고 있다. 본 연구는 디지털 시스템 중 레이저 마킹 프로그램을 활용하여 이미지 각인 표현 방법으로 창의적인 뷰티산업과 장신구 네일아트가 대중화되기를 기대하며 시각적인 아름다움을 표현하는 새로운 표현 발상의 방향성을 제시하고자 한다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2007년도 춘계학술대회A
• /
• pp.1475-1480
• /
• 2007

In the last few years, lasers have found new applications in production engineering as tools for surface treatment, cutting, welding, drilling and marking. So far, the laser has mainly been used in special laser processing machines ('laser-only') directly integrated into a production line or serving as stand-alone stations in the workshop. By combining conventional metal cutting technologies with laser processes in one machine, complete processing of a workpiece with different technologies in one setting can be realized. The main advantages are a reduction of the material flow between the production machines, which leads to a reduction in processing time and logistics, and an enhancement of manufacturing quality due to the processing in one setting. In addition to this approach new processing technologies such as laser-assisted machining are possible.

• KIEE International Transactions on Electrophysics and Applications
• /
• 제4C권3호
• /
• pp.96-100
• /
• 2004

The Nd： YAG laser is commonly used throughout many fields such as accurate material processing, IC marking, semiconductor annealing, medical operation devices, etc., due to the fact that it has good thermal and mechanical properties and is easy to maintain. In materials processing, it is essential to vary the laser power density for specific materials. The laser power density can be mainly controlled by the current pulse width and pulse repetition rate. It is important to control the laser energy in those fields using a pulsed laser. In this paper we propose the constant-frequency current resonant half-bridge converter and monitoring of capacitor charging voltage. This laser power supply is designed and fabricated to have less switching loss, compact size, isolation with primary and secondary transformers, and detection of capacitor charging voltage. Also, the output stabilization characteristics of this Nd： YAG laser system are investigated. The test results are described as a function of laser output energy and flashlamp arc discharging constant. At the energy storage capacitor charges constant voltage, the laser output power is 2.3％ error range in 600[V].

• 한국레이저가공학회:학술대회논문집
• /
• 한국레이저가공학회 2004년도 추계학술대회논문집
• /
• pp.22-28
• /
• 2004

Pit and rim formation on the Acrylonitrile Butadiene Styrene(ABS) plastic surface was evaluated after it was irradiated by $CO_2$ and Nd:YAG laser beams. Our results show that thermal effect floor was well observed at the outer wall of pit with $CO_2$ laser irradiated while it was not the case with Nd:YAG laser irradiated. Also the volume and depth of pit formation increase proportionally with the energy intensities of two laser irradiations, but there are significant differences in the slope, width, and FWHM of the Pit formation with two types of laser irradiations. This result shows that $CO_2$ laser irradiation leads to better cooling contraction effect while Nd:YAG laser irradiation induces better recoil pressure effect during the interaction between ABS plastic and laser beam irradiation. The shape of the laser marking could vary significantly depending on the traveling path of molten plastic during injection molding of ABS plastic. Therefore, the selection of material and molding process can have a great impact on the performance of optical storage media.