• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.658-660
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• 2003

본 논문에서는 AMBA 기반의 FPD 시스템에 적용 가능한 콘트라스트 컨트롤러를 설계 및 구현하였다. 제안한 콘트라스트 컨트롤러 내부에는 AMBA의 인터페이스 spec을 준수한 AMBA AHB 컨트롤러와 콘트라스트조정 블록, 메모리 컨트롤러. FPD 컨트롤러가 내장되어있다. 구현한 알고리즘은 실시간 처리가 가능하며 콘트라스트의 범위를 조정하는 가중치를 가진 알고리즘으로 기준되는 값을 이용하여 콘트라스트의 효율적인 조정이 가능하다. 콘트라스트 컨트롤러는 VHDL로 설계하였으며 FPGA를 이용한 H/W를 구현하여 TFT-LCD panel에 디스플레이 하여 검증하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.128-128
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• 2011

Polysilicon thin-film transistors (poly-Si TFTs)는 능동행렬 액정 표시 소자(AMLCD : Active Matrix Liquid Crystal Display)와 DRAM과 같은 메모리 분야에 폭넓게 적용이 가능하기 때문에 많은 연구가 진행되고 있다. 최근 poly-Si TFTs의 우수한 특성으로 인하여 주변 driving circuits에 직접화가 가능하게 되었다. 또한 디스플레이 LCD 패널에 controller와 메모리와 같은 다 기능의 장치을 직접화 하여 비용의 절감과 소자의 소형화가 가능한 SOP (System on panels)에 연구 또한 진행 되고 있다. 이미 잘 알려진 바와 같이 비휘발성 메모리는 낮은 소비전력과 비휘발성이라는 특성 때문에 이동식 디바이스에 데이터 저장 장치로 많이 사용되고 있다. 하지만 플로팅 타입의 비휘발성 메모리는 제작공정의 문제로 인하여 SOP의 적용에 어려움을 가지고 있다. SONOS 타입의 메모리는 빠른 쓰기/지우기 효율과 긴 데이터 유지 특성을 가지고 있으나 소자의 스케일링 따른 누설전류의 증가와 10년의 데이터 보존 특성을 만족 시킬 수 가 없는 문제가 발생한다. 본 연구에서는 SOP 적용을 위하여 ELA 방법을 통하여 결정화한 poly-Si TFT memory를 SiO2/Si3N4/SiO2 Tunnel barrier와 High-k HfO2과 Al2O3을 Trapping layer와 Blocking layer로 적용, 비휘발성 메모리을 제작하여 전기적 특성을 알아보았다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.2
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• pp.121-128
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• 2011

As high precision industries such as semiconductor, TFT-LCD manufacturing and MEMS continue to grow, the demand for higher DOF precision stages has been increasing. In general, the stages should accommodate a prescribed range of payloads in order to position various precision manufacturing/inspection instruments. Therefore a nonlinear controller using sliding motion is developed, which bears mass perturbation and makes the upper plate of the stage move in 6 DOF. For the application of the nonlinear control, an observer is also developed based on expected noise covariance. To eliminate the steady state error of step response, integral terms are inserted into the state-space model. The linear term of the controller is designed using optimization scheme in which parameters can be weighted according to their physical significance, whereas the nonlinear term of the controller is designed using trial and error method. A comprehensive simulation study proves that the designed controller is robust against mass perturbation and completely eliminates steady state errors.

• Journal of Biomedical Engineering Research
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• v.13 no.4
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• pp.269-274
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• 1992

In this paper, we describe the design methodology and specifications of the developed module-based bedside monitors for patient monitoring. The bedside monitor consists of a main unit and module cases with various parameter modules. The main unit includes a 12.1" TFT color LCD, a main CPU board, and peripherals such as a module controller, Ethernet LAN card, video card, rotate/push button controller, etc. The main unit can connect at maximum three module cases each of which can accommodate up to 7 parameter modules. They include the modules for electrocardiograph, respiration, invasive blood pressure, noninvasive blood pressure, temperature, and SpO2 with Plethysmograph.raph.

• Journal of Biomedical Engineering Research
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• v.18 no.2
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• pp.133-146
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• 1997

In this paper, we describe the design methodology and specifications of the developed module-based bedside monitors for patient monitoring. The bedside monitor consists of a main unit and module cases with various parameter modules. The main unit includes a 12.1" TFT color LCD, a main CPU board, and peripherals such as a module controller, Ethernet LAN card, video card, rotate/push button controller, etc. The main unit can connect at maximum three module cases, each of which can accommodate up to 7 parameter modules. They include the modules for electrocardiograph, respiration, invasive blood pressure, noninvasive blood pressure, temperature, and SpO with plethysmograph.raph.

• Journal of Korean Association for Spatial Structures
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• v.14 no.2
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• pp.87-94
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• 2014

In this study, a smart isolation platform has been developed for control of microvibration of high-technology facilities, such as semi-conductor plants and TFT-LCD plants. Previously, microvibration control performance of a smart base isolation system has been investigated. This study compared microvibration control performance of a smart isolation platform with that of conventional base isolation and fixed base. For this purpose, train-induced ground acceleration is used for time history analysis. An MR damper was used to compose a smart isolation platform. A fuzzy logic controller was used as a control algorithm and it was optimized by a multi-objective genetic algorithm. Numerical analysis shows that a smart isolation platform can effectively control microvibration of a high-technology facility subjected to train-induced excitation compared with other models.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.1525-1527
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• 2013

본 논문에서는 저시력자의 개선된 독서 환경을 제공하는 시각보조기기를 위한 실시간 영상처리 SoC(System on Chip) 하드웨어 구조 설계에 대해서 기술한다. 기존의 시각보조기기는 화면 영상이 실제 움직임보다 늦게 출력되는 잔상 현상이 발생하며, 색 변환 기능도 제한적이다. 따라서 본 논문에서 제안하는 실시간 영상처리 SoC 하드웨어 구조는 데이터 연산을 최소화함으로써 잔상 현상이 감소되며, 저시력자를 위한 다양한 색상 모드를 지원한다. 제안하는 영상처리 SoC 하드웨어 구조는 Core-A 모듈, Memory Controller 모듈, AMBA AHB bus 모듈, ISP(Image Signal Processing) 모듈, TFT-LCD Controller 모듈, VGA Controller 모듈, CIS Controller 모듈, UART 모듈, Block Memory 모듈로 구성된다. 시각보조기기를 위한 실시간 영상처리 SoC 하드웨어 구조는 Virtex4 XC4VLX80 FPGA 디바이스를 이용하여 검증하였으며, TSMC 180nm 셀 라이브러리로 합성한 결과 동작주파수는 54MHz, 게이트 수 197k이다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.9C
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• pp.652-660
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• 2008

Applications running under embedded systems require various device drivers designed for different types and versions of the OS to manage resources effectively. In this paper, an automated device driver generator system which can generate the device drivers to be used in newer versions the target OS is proposed. In the proposed system, the structures of device drivers of specific OS are designed in the templates and stored in a library, and the target device drivers are generated by adding codes to the stored templates. Once device drivers are generated, they are registered into the kernel. The experimental results show that data transfer time has been slightly increased when compared against manually created drivers for TFT-LCD driver, USB interface keyboard/mouse driver, and AC'97 controller drivers. The code size for the generated drivers after compilation has also been increased slightly when compared with manually designed device drivers.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1199-1201
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• 2002

Today, the ceramic transformer becomes widely used for the TFT LCD backlight inverter system thanks to its high efficiency and small size. In this paper, a high efficient inverter system for cold cathode flourescent lamp (CCFL) including PLL controller for tuning the PWM frequency to the frequency that the efficiency of the inverter system becomes maximum is proposed. The control IC implementing this feature will be released by Interpion Co. Ltd. in May 2002.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1209-1212
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• 2005

By using x86 processor for office environment, an improved Network Display System is implemented in this paper. The Network Display System is developed based on the x86 processor, and the system contains ethernet controller that can be used internet by stand alone. The Windows CE.NET is adopted as an operating system, and TFT-LCD monitor system is embedded..