• 한국정밀공학회지
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• 제19권9호
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• pp.125-132
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• 2002

We use a compound-cam twin arm structure and random tool access method to achieve a faster ATC (Automatic Tool Changer) system for the accurate position and rotation control of a tool magazine and an exchange am. Based on the data obtained from various sensors, it is possible to follow the sequence of commands in each control step for an exchange arm. However, it is not so easy to reduce the exchange time of the system because of the slow responses of the sensors and execution mode delays of PLC (Programmable Logic Controller) scan time. In this paper, we propose a new programmed limit-switch position control method to obtain the shortest possible delays for the random tool access method and compound-cam twin arm structure. With some experimental results, we have achieved below 0.9sec tool exchange time with the proposed method.

• 한국정보처리학회논문지
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• 제7권7호
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• pp.2219-2228
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• 2000

다중 프로세서 시스템에서 각각의 프로세서에 할당되어 있는 지역 캐쉬에 데이터의 복사본이 분산 공유되어 있는 경우 데이터의 일관성 유지가 필요하다. 따라서 캐쉬 일관성 유지 프로토코콜은 공유 메모리 다중 프로세서 시스템의 정확하고 효율적인 작동이 중요하다. 그러므로 시스템이 복잡해짐과 비례하여 현재 사용되고있는 무작위적 테스트나 시뮬레이션은 프로토콜의 정확성을 확인하기에 충분하지 못하므로 보다 효율적이고 믿을 만한 검증 방법이 필요하다. 본 논문은 ETRI에서 개발된 캐쉬 일관성 프로토콜인 RACE(Remote Access Cache coherent Enforcement)프로토콜의 몇 가지 특성(property)들을 정형기법에 쓰이는 도구 중이 하나인 VIS(Verification Interacting with Synthesis)를 이용하여 검증한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.780-785
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• 2003

Recently the trends in information storage devices need small size, mobility, high capacity, and low power consumption etc. To satisfy those, the development of high performance actuator is an important issue. Compared with general linear actuator for optical disk drive, swingarm type rotary actuator is suitable to design in small form factor and has fast access time for random access. Swingarm actuator is designed considering the structural problem and the actuating force of VCM(Voice Coil Motor). The increase of mass caused by optical components makes vibration problems of swing-arm, therefore resonance frequency should be increased and inertia has to be reduced. ANSYS FEM tool is employed in optimizing swingarm. The VCM is designed using 3-D electro-magnetic analysis, and parameters of magnetic circuit are determined to matte large flux density. The large flux density enables to achieve low power consumption. VCM holder is designed to get the mass balance of total actuator and this balance reduces the magnitude of critical mode relative to pivot bearing, It is expected that swingarm type rotary actuator designed by this method is available to variable type of micro optical disk drives.

• 정보교육학회논문지
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• 제1권1호
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• pp.82-91
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• 1997

본 연구는 열린 교육 환경의 일환으로 초등학생이 문제해결 방법을 효과적으로 학습할 수 있는 인터넷 기반 코스웨어를 설계하고 구현하는 것을 목적으로 하였다. 코스웨어는 인터넷 서비스 중 GUI가 지원되는 웹 서비스를 이용하여 개발되었다. 시스템 구현을 위하여 문제해결의 의미 및 과정과 컴퓨터를 활용하여 해결학습을 할 때의 고려할 점을 살펴보았다. 그리고, 교육적 도구로서 웹의 효용성과 한계점을 파악함으로써, 웹을 교육에 효과적으로 이용할 수 있는 방안에 대해 모색하고 웹 애플리케이션을 개발하는 데 요구되는 원리 및 기술들에 대해 살펴보았다. 코스웨어의 주제는 문제해결학습에 적합한 SATIS의 학습 내용 가운데 하나를 선정하였다. 인터넷에 기반한 문제해결학습을 위해 코스웨어는 학습 활동 모듈, 교수 활동 모듈, 학습 도구 모듈로 구성되었으며, 코스웨어의 흐름을 제어하는 학습 활동 모듈에서는 문제중심학습의 학습과정에 따라 구현되었는데, 이 학습 과정은 순차적으로 학습해 갈 수 있지만, 임의적으로 어느 곳으로든지 옮겨갈 수 있도록 링크를 설정해 두었다. 이 임의적 접근은 학습자들이 각자의 경험에 맞게 학습해 나갈 수 있도록 하기 때문에 학습자들의 학습을 촉진시킨다. 교수 활동 모듈은 교사에게 학습자들의 학습을 조력해주기 위해 유용한 지식과 정보를 제공해주고, 학습자들의 학습 결과를 평가하여 적절한 피드백을 제공해 줄 수 있는 여지를 마련해 준다. 학습 도구 모듈에서는 토론장, 전자우편 주소록, 도움말, 검색 도구가 제공되어지는데 이것은 학습 활동 모듈과 교수 활동 모듈에 연결되어 있어서, 교사나 학생들이 그 학습 도구를 사용하여 교수-학습 활동을 활발히 진행해 나갈 수 있도록 하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.647-650
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• 2006

Low temperature polycrystalline silicon (LTPS) technology using a high power laser have been widely applied to thin film transistors (TFTs) for liquid crystal, organic light emitting diode (OLED) display, driver circuit for system on glass (SOG) and static random access memory (SRAM). Recently, the semiconductor industry is continuing its quest to create even more powerful CPU and memory chips. This requires increasing of individual device speed through the continual reduction of the minimum size of device features and increasing of device density on the chip. Moreover, the flat panel display industry also need to be brighter, with richer more vivid color, wider viewing angle, have faster video capability and be more durable at lower cost. Kornic Systems Co., Ltd. developed the $KORONA^{TM}$ LTP/GLTP series - an innovative production tool for fabricating flat panel displays and semiconductor devices - to meet these growing market demands and advance the volume production capabilities of flat panel displays and semiconductor industry. The $KORONA^{TM}\;LTP/GLTP$ series using DPSS laser and XeCl excimer laser is designed for the new generation of the wafer & FPD glass annealing processing equipment combining advanced low temperature poly-silicon (LTPS) crystallization technology and object-oriented software architecture with a semistandard graphical user interface (GUI). These leading edge systems show the superior annealing ability to the conventional other method. The $KORONA^{TM}\;LTP/GLTP$ series provides technical and economical benefits of advanced annealing solution to semiconductor and FPD production performance with an exceptional level of productivity. High throughput, low cost of ownership and optimized system efficiency brings the highest yield and lowest cost per wafer/glass on the annealing market.

• Safety and Health at Work
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• 제11권4호
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• pp.526-532
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• 2020

Background: The high incidence of work-related diseases and injuries among day-laborers and workers with no legal contracts (informal workers) has received the attention of the Thai authorities. Workers' low occupational health literacy (OHL) has been reasoned as one contributing factor. Absence of a valid tool has prevented assessment of informal workers' OHL. The aim of this study was to create a valid and reliable Occupational Health Literacy Scale within the context of Thai working culture (TOHLS-IF). Methods: This study used the mixed method approach to develop TOHLS-IF. Questions were generated using in-depth interviews and an extensive review of the literature. Experts' assessment confirmed the content validity of TOHLS-IF. The scales of its psychometric properties were assessed in a sample of 400 informal workers using cluster random sampling. Results: The final version of the TOHLS-IF comprises 38 items within 4 dimensions: Ability to Gain Access, Understanding, Evaluation, and Use of occupational health and safety information. Factor analysis identified items explaining 50.22% of the total variance. The final confirmatory analysis confirmed the model estimates were satisfactory for the construct. TOHLS-IF demonstrated a high internal consistency and satisfactory reliability (Cronbach's alpha = .98). Conclusion: The TOHLS-IF is a valid and reliable instrument to assess informal workers' OHL. The structural dimensions of this instrument are based on the concept of health literacy and Thai culture. Thai health professionals are encouraged to benefit from this instrument to assess their workers' OHL and apply findings as guidelines for effective occupational health and safety interventions.