• 한국정밀공학회지
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• 제21권9호
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• pp.135-141
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• 2004

Anti-shock performance is one of the most important design specifications of TFT-LCD modules. Since they are adopted fur major display units of many mobile applications such as lap-top PCs, cellular phones, and palm pilots, they are able to accommodate and endure high level transient mechanical energy inputs. For the reasons, not only the LCD unit manufacturers but their customers like PC makers perform a series of strict impact/drop test on the units. Currently, designers are mostly relying on their own trial-error based experience for the anti-shock design. Thus those designs depending on only experience may result in disqualification from the drop/impact test during final product evaluation. Those shock failures of any new designs are prohibitive for both LCD and PC manufacturers. In order to avoid this problem, many designers are focusing on the development of computer-aided design tools that is directly connected to shock simulation capabilities and then shock-proof design cycle time could be significantly reduced. Development of an integrated CAE system for the shock-proof design is presented in this article. At every stages of the development of present work, practical industrial applicability and mass production feasibility are seriously considered and tested so that the system is to be used in the LCD design engineering field.

• 디자인학연구
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• 제20권3호
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• pp.73-84
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• 2007

본 연구는 한국의 시각디자인 교육에 대한 성찰적이며 비판적인 연구이다. 이를 위하여 1946년 처음 대학에 디자인 교육이 도입된 이래 한국의 디자인 교육을 이끌어온 서울대학교, 이화여자대학교, 홍익대학교의 시각디자인학과를 대상으로 세 대학의 교과과정의 변천을 분류하고, 세 대학 교수들의 학적 배경을 조사하여 한국의 대학 디자인 교과과정의 문제점 및 디자인 교육의 지적 편향에 의한 구조적 변화를 살펴보았다. 디자인 분야의 잘못된 교과과정은 일본으로부터 이식된 후, 미 군정에 의한 미국 대학의 교과과정이 여과되지 않은 채 그대로 우리 대학에 수용되면서 미국과 서구 중심의 교과과정으로 구조화되었다. 그 결과, 실기 위주의 교육과 사회 문화에 대한 이해가 결여된 기능 위주의 디자인 교육만을 중시하는 교육 풍토를 가져왔다. 한국 디자인 교육의 잘못된 교과과정을 바로잡기 위해서는 우리 디자인에 대한 담론을 만들고 그러한 담론을 통하여 주체적 사상과 이념을 만들 수 있는 인문 중심의 교육과정 구성이 필요하다. 또한 외국 학위자 중심의 교수진 인적 편포를 해결하기 위해서 국내 학위자 중심의 학자양성 프로그램과 이에 대한 충분한 지원을 하여 주체적인 학자 양성에 힘써야 한다.

• 한국정밀공학회지
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• 제20권4호
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• pp.29-38
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• 2003

This paper deals with an automated computer-aided process planning and die design system with which designer can determine operation sequences even after only a little experience in process planning and die design of multi former-bolt products by multi-stage former working. The approach is based on knowledge-based rules, and a process knowledge base consisting of design rules is built. Knowledge fur the system is formulated from plasticity theories, empirical results and the empirical knowledge of field experts. Programs for the system have been written in AutoLISP for AutoCAD with a personal computer. An attempt is made to link programs incorporating a number of expert design rules with the process variables obtained by commercial FEM softwares, DEFORM and ANSYS, to form a useful package. The system is composed of four main modules. The process planning and die design module considers several factors, such as the complexities of preform geometry, punch and die profiles, specifications of available multi former, and the availability of standard parts. It can provide a flexible process based on either the reduction in the number of forming sequences by combining the possible two processes in sequence, or the reduction of deviation of the distribution and the level of the required forming loads by controlling the forming ratios. The system uses 2D geometry recognition and is integrated with the technology of process planning, die design, and CAE analysis. The standardization of die parts for multi former-bolt products requiring a cold forging process is described. The system developed makes it possible to design and manufacture multi former-bolt products more efficiently.

• 센서학회지
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• 제32권2호
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• pp.124-130
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• 2023

Implementing flexible production systems in domestic and foreign automotive design parts assembly has increased demand for automation and power reduction. Consequently, transition to a hybrid production method is observed where multiple vehicles are assembled in a single assembly line. Multiple robots, 3D vision sensors, mounting positions, and correction software have complex configurations in the automotive glass mounting system. Hence, automation is required owing to significant difficulty in the assembly process of automobile parts. This study presents a primer lighting and inspection algorithm that is robust to the assembly environment of real automotive design parts using high power 'ㄷ'-shaped LED inclined lighting. Furthermore, a 2D camera was developed in the primer coating inspection system-the core technology of the glass mounting system. A primer application demo line applicable to the actual automobile production line was established using the proposed high power lighting and algorithm. Furthermore, application inspection performance was verified using this demo system. Experimental results verified that the performance of the proposed system exceeded the level required to satisfy the automobile requirements.

• Geomechanics and Engineering
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• 제21권6호
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• pp.513-525
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• 2020

Slopes stabilised with piles are seldom analysed considering uncertainties in the parameters of the pile-slope system. Reliability analysis of the pile-slope system quantifies the degree of uncertainties and evaluates the safety of the system. In the present study, the reliability analysis of a slope stabilised with piles is performed using the first-order reliability method (FORM) based on Hasofer-Lind approach. The implicit performance function associated with the factor of safety (FS) of the slope is approximated using the response surface method. The analyses are carried out considering the design matrices formulated based on both the 2^k factorial design augmented with a centre run (2^k fact-centred design) and face-centered cube design (FCD). The finite element method is used as the deterministic model to compute the FS of the pile-slope system. Results are compared with the results of the Monte Carlo simulation. It is observed that the optimum location of the row of piles is at the middle of the slope to achieve the maximum FS. The results show that the reliability of the system is not uniform for different pile configurations, even if the system deterministically satisfies the target factor of safety (FS_t) criterion. The FS_t should be selected judiciously as it is observed that the reliability of the system changes drastically with the FS_t level. The results of the 2^k fact-centred design and FCD are in good agreement with each other. The procedure of the FCD is computationally costly and hence the use of 2^k fact-centred design is recommended, provided the response of the system is sufficiently linear over the factorial space.

• 한국자동차공학회논문집
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• 제17권2호
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• pp.165-170
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• 2009

Pressure ripple, vibration and noise level are measured in each parts of the power steering system. MD(Mahalanobis Distance) is calculated by using MTS(Mahalanobis Taguchi System) with measured data, and noise sensitive components are selected. The components applied detail design parameters are made and data is measured. After that MD is calculated also. Mean value and SN ratio can be obtained from the MD. Effective noise reduction technique and dominant design parameters in hydraulic power steering system are introduced.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권2호
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• pp.149-163
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• 2009

This paper intends to suggest a design to reduce the thermal load of a hand-carried ultrasound (HCU) system, with the aim of increasing the product life. To design ways to reduce the heat load, the surface temperatures of key parts of an HCU system were measured as the 4 system cooling fans, which have a direct relation to the system life, were operated normally. When the derating rate of 80% was applied while the fans of the HCU system were operated abnormally, it was observed that the key image processing parts exceeded the surface temperature (TC) with consideration to derating. Since the part surface temperature did not exceed the derated level when the regulated voltage was derated from 12V to 9V, it is expected to lower the operating voltage of the fans to 9V to increase the fan and HCU system lifetime by 1.8 times.

• 전기학회논문지
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• 제58권1호
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• pp.107-112
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• 2009

This paper describes design and fabrication issues of the SiP(System in Package) one-chip for a portable digital broadcasting receiver. It includes RF tuner chip, demodulator chip and passive components for the receiver system. When we apply the SiP one-chip technology to the broadcasting receiver, the system board size can be reduced from $776mm^2$ to $144mm^2$. SiP one-chip has an advantage that the area reduces more 81% than separated chips. Also the sensitivity performance advances -1dBm about 36 channels in the RF weak electric field, the power consumption reduces about 2mW and the C/N keeps on the same level.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.137-139
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• 1993

This paper details methods used to verify the adquacy of a dc traction power supply for design in Seoul matropolitain subway Line-6 system. Examples of the approach are given for a major subway presently under construction. The performance of trains operating at maximum system design capacity is modelled using a train simulation program. Using a dc network analyser program, the maximum train operating timetable, and a model of the ac and dc electrical suppy system, the electrical performance of the entire system can be modelled over a 24-hour period. The results of this analysis are used to determime: train voltage at a level sufficient to ensure train schedules: adequacy of traction transformers, rectifier, and switchgear ratings; sizes of the overhead contact systern conductors, and ac and de feeder cables: and power and energy demands at the utility company's supply points for inital and final timetable operations.

• 디지털콘텐츠학회 논문지
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• 제19권6호
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• pp.1061-1068
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• 2018

디자인은 이미 우리 삶속에 없어서는 안 될 요소로 많은 영역에 다양한 형태로 존재한다. 다양한 디자인이 생성되면서 디자인의 가치 정립(아이덴티티)의 더욱 중요해졌고, 개발된 디자인을 바르게 사용하고 배포 관리하여 일관성을 유지하는 것도 개발만큼 중요한 일이 되었다. 국가적 차원에서 유치하여 치러진 2018 평창 동계올림픽대회 및 동계패럴림픽대회는 다양한 콘텐츠를 생성하고 운영하여 전 세계에 대한민국을 알리는 중요한 역할을 하였다. 한국적 특성을 잘 반영 할 수 있는 '한글'을 모티브로 개발된 엠블럼과 대회 룩, 대회의 정체성을 잘 드러낸 마스코트 등을 만들었다. 생성된 콘텐츠들은 사용자(후원사, 언론, 유관기관 등)의 편의성을 고려하여 디자인 가이드로 만들어져 디자인 배포 시스템(DDS)을 통하여 관리되었다. 본 연구자는 POCOG의 DDS를 운영하여 얻어진 결과를 토대로 디자인 배포 및 관리 시스템의 효용성과 가치를 판단하고자 한다.