• 기계와재료
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• v.22 no.1
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• pp.30-35
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• 2010

전자부품산업이 빠르게 발전하고 있기 때문에 고기능성 PCB의 수요 또한 많이 늘고 있다. 이러한 PCB는 전자제품의 굴곡성(flexibility) 있는 형태로 발전하여 전자제품의 소형화 및 고밀도화가 가능하고, 반복적인 굴곡에 높은 내구성을 갖는 연성(flexible) PCB(FPCB)의 사용이 증가하고 있으며, 이런 시장의 요구에 맞춰 연성 다층 구조의 FPCB에 대한 정밀 고속 가공 기술에 대한 수요도 급격히 확대되고 있다. 따라서 장비 운영의 효율성 극대화 및 설비 투자를 최소화하고 단일 장비로 절단(half cut, full cut), 제거, 트리밍, 리페어 고정 등을 수행할 수 있는 장비 개발을 위한 스캐너/스테이지 고정밀 제어, Z축 스텝가공, 멀티포인트 비전 인식을 통한 왜곡 최소화 등의 요소기술 개발관련 내용을 소개하고자 한다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.220-221
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• 2000

가공용 레이저로는 $CO_2$, 루비, Nd:YAG, 아르곤 이온 레이저 등이 이용되고 있으며, 이중 펄스형 Nd:YAG 레이저는 $CO_2$ 레이저와 함께 레이저 가공에 널리 사용되는 고체 레이저로서 마킹(making), 트리밍(trimming), 리페어링(repairing) 등의 정밀 가공 분야에서 많은 실용화가 이루어져 왔다.$^{(1)}$ $CO_2$ 레이저의 경우 매질가스로 $CO_2$, $N_2$, He 등을 사용해야하므로 취급 및 유지보수가 불편하지만, 열전도율이 높고, 기계적 광학적으로 안정된 Nd:YAG 레이저는 램프에 의한 광 여기 방식이므로 유지보수가 쉽다. 또한 광 출력의 제어가 용이하며, 광파이버에 의한 빔 전송이 가능하여 산업기술 및 의료 분야에서의 적용이 더욱 더 확대되고 있다.$^{(2)}$ (중략)

• Journal of the Semiconductor & Display Technology
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• v.16 no.3
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• pp.36-40
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• 2017

In this paper, a new method of laser trimming of thick film heater is studied. Various laser waves (IR, Green, UV) are used to ablation the heater and the process parameters are also presented. For given initial printed resisters, the cutting length should be prepared to obtain the target resister value in advance. Therefore, the cutting model is very important. The well-known model was tested and proven that it is valid only within a certain range of cutting length. A new model is proposed for a wide range of resister laser trimming. The cutting lengths and resister variation was obtained and formulated. To verify the presented method, the cutting lengths of each resister are calculated for various target resister value and laser trimming using UV is conducted.

• Transactions of Materials Processing
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• v.31 no.2
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• pp.103-108
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• 2022

Systematic quality control based on real time data is required for modern factories. This study introduced a method of predicting punch wear in the trimming process of automobile parts. Based on monitoring data of the mass production process using a bolt-type piezo sensor, it was shown that precursor symptoms of die wear could be predicted from the change in load pattern with respect to production volume. The load pattern that changed according to the wear of the die was verified by numerical analysis.

• Journal of Auto-vehicle Safety Association
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• v.14 no.1
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• pp.32-38
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• 2022

In the automobile industry, lamps are frequently used as a mean to emphasize each company's brand identity. Therefore, many detailed design models have emerged in order to realize a differentiated image in preparation for competitive vehicles. Among them, the design of a multi compartment lighting image concept that realizes light divided in multiple space also being introduced by various manufacturers. In this study, in order to solve the problem of cost and weight rise that the existing multi compartment image lamp has, using TRIZ method such as functional analysis modeling and trimming. Through this process, an idea to minimize cost and weight was derived. As the idea was designed in detail, the formation of light did not go as desired, and the diffusion of light also proceeded differently than intended. In order to overcome this problem, a new concept of corrosion and diffusion structure was applied. Eventually, it overcomes various problems and successfully applied it to a real vehicle. The idea was actually reflected in the "Santa Fe" model. Later, the media focused on the lamps to which the idea was applied, and contributed to the sale of a large number of vehicles by providing consumers with a new light sensibility. During the research process, it was possible to secure a number of patents and knowledge of new design concepts.

• The Journal of Korean Academy of Prosthodontics
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• v.49 no.2
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• pp.114-119
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• 2011

The aim of this study was to investigate effect of specimen preparation method on the microtensile bond strength of veneering ceramic to zirconia core. Materials and methods: Cylindrical Lava zirconia block (3M ESPE, Seefeld, Germany) was cut into discs using a diamond disc. After sintering, the core specimens were placed in an adjustable mold and veneered with Lava ceram (3M ESPE, Seefeld, Germany). The disc shaped specimen of group 1 was cut into microbars ($1{\times}1{\times}7\;mm^3$) using a low speed diamond disc under water cooling (n = 15). The specimen of group 2 was cut into microbars ($1.2{\times}1.2{\times}7\;mm^3$) in the same way. Whereafter the microbars were trimmed ($1{\times}1{\times}7\;mm^3$) using a thick diamond disc under water cooling (n = 15). The microtensile bond strength was tested in a microtensile tester (Instron 8848, $Instron^{(R)}$ Co., Norwood, USA). Fractured microtensile specimens were analyzed under a stereomicroscope (MZ6, Leica Microsystems GmbH, Wetzlar, Germany) at magnification ${\times}30$. Results: The microtensile bond strength of group 1 ($28.8{\pm}7.0\;MPa$) was significantly higher than group 2 ($11.0{\pm}33\;MPa$) (P=.00). Conclusion: It appears advisable to avoid the trimming action, especially high strength ceramic specimens.

• Composites Research
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• v.34 no.5
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• pp.296-304
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• 2021

This study presented the evaluation of the stamp forming process for L-shape CF/PEKK thermoplastic composite using the finite element model. The formability of three different trimming allowances has been examined for representative product geometry. The results showed that those manufactured by high trimming allowance showed more excellent formability in those areas. Moreover, the effects of the trimming allowances on the stress, thickness, wrinkle distributions of thermoplastic composites fabricated with the stamp forming process were evaluated. The comparison of the simulation and experimental results for the thickness and wrinkle distributions proved the accuracy of the stamp forming model. The crystallinity of the composite was performed by differential scanning calorimetry (DSC). The void content of the composite was evaluated by matrix digestion. Then, the fabricated structure was characterized and achieved high quality in crystallinity and void content. Consequently, the presented FEM modeling shows excellent potential for application in the aircraft product design process. This pragmatic approach could efficiently offer a valuable solution for the thermoplastic composite manufacturing field.

• Journal of Fashion Business
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• v.13 no.1
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• pp.125-140
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• 2009

The purpose of this study was to examine the Detail&Trimming from 16C to 18C, so called 'the age of decoration' and how they had been applied to contemporary fashion through various collections. Then this study investigated decorative trends based on the frequency analysis. For the methods of study, using literature review, theoretical research was conducted to investigate the kinds of modern clothing accessories and analyze how they were applied to contemporary fashion and its trends. The period of empirical research was from 2000 to 2006 S/S with its focus on "Mode et Mode", a representative fashion magazine. As a result, for detail, decorative composition, surface decoration, and trimming, detail-applied decorative designs showed the highest percent. To get a closer look, the highest applied decorative technique was found rough collar in the detail; fringing in the decorative composition; slash in the surface decoration; and jewelry in the trimming.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.24 no.6 s.177
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• pp.1499-1512
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• 2000

The dynamic explicit finite element method and the static implicit finite element method are applied effectively to analyze total auto-body panel stamping processes, which include the forming stage , the trimming stage and the spring-back stage.\The explicit time integration method has better merits in the forming stage including highly complicated three-dimensional contact conditions. On the contrary, the implicit time integration method is better for analyzing spring-back since the complicated contact conditions are removed and the computing time to get the final static state is short. In this work, brief descriptions of the formulation and the factor study are presented. Further, the simulated results for the total auto-body panel stamping processes are shown and discussed. The formability and the weld line movement in stamping with Tailor Welded Blanks were investigated through QTR-OTR-FRT.

• Transactions of Materials Processing
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• v.15 no.6 s.87
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• pp.459-466
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• 2006

Trimming line design plays an important role in obtaining accurate edge profile after flanging. Compared to the traditional section-based method, simulation-based method can produce more accurate trimming line by considering deformation mechanics. Recently, the use of a finite element inverse method is proposed to obtain optimal trimming line. By analyzing flanging inversely from the final mesh after flanging, trimming line can be obtained from initial mesh on the drawing die surface. Initial guess generation fer finite element inverse method is obtained by developing the final mesh onto drawing tool mesh. Incremental development method is adopted to handle irregular mesh with various size and undercut. In this study, improved incremental development algorithm to handle complex shape is suggested. When developing the final mesh layer by layer, the algorithm which can define the development sequence and the position of developing nodes is thoroughly described. Flanging of front fender is analyzed to demonstrate the effectiveness of the present method. By using section-based trimming line and simulation-based trimming line, incremental finite element simulations are carried out. In comparison with experiment, it is clearly shown that the present method yields more accurate edge profile than section-based method.