• 한국공작기계학회논문집
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• 제10권5호
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• pp.53-59
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• 2001

A screw driver is widely used in assembling machine parts or electronic products such as the printed circuit board with a housing. As the parts to be assembled becomes small and precise, the higher precision of the controlling screw driver torque is required. However, because the operator controls the fastening torque based on experience, it must be inexact and the setting procedure will be time consuming job. Thus the screw driver which can exactly control the fastening torque is developed utilizing a bellows in this paper. The bellows is expanded by the inner air pressure and contracted by the spring operation. The bellows type driver is composed of a clutch mechanism with two solenoid valves and a pressure sensor. Those valves are controlled using the detected bellows pressure by the sensor. When the pressure reaches the setting value, the exit solenoid valve is opened to release the air pressure from the bellows so as not to deliver further torque. Through a series of experiments, the performance is examined and verified.

• 한국정보과학회논문지:시스템및이론
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• 제32권3호
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• pp.107-114
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• 2005

본 논문에서는 이중 커널 OS인 RTLinux에서 실시간, 비실시간 커널의 응용 프로그램을 동시에 지원하기 위한 IEEE1394 디바이스 드라이버의 구조를 설계 및 구현하였다. 제안한 이중 커널 OS를 위한 디바이스 드라이버는 양 커널의 태스크를 동시에 지원할 수 있는 장점을 가진다 이와 더불어 제안된 디바이스 드라이버는 실시간 커널측의 작업 요청을 우선적으로 처리하도록 구성하여 실시간성 보장이 가능하도록 배려하였다. 이 디바이스 드라이버의 구조는 RTLinux뿐만 아니라 이중 커널 시스템을 위한 디바이스 드라이버 설계에 도움이 될 것이다.

• 한국안전학회지
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• 제24권1호
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• pp.69-77
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• 2009

This paper reports the aging driver traffic accident severity modeling results. For the modeling, Poisson regression approach is applied using the data set obtained from the Korea Transportation Safety Authority's simulator-based driver aptitude test results. The test items include the estimations of moving objects' speed and stopping distance, drivers' multi-task capability, and kinetic depth perception and so on. The resulting model with the response variable of equivalent property damage only(EPDO) indicated that EPDO is significantly influenced by moving objects' speed estimation and drivers' multi-task capabilities. More interestingly, a comparison with the younger driver model revealed that the degradation of such capabilities may result in severer crashes for older drivers as suggested by the higher estimated parameters for the older driver model.

• 조명전기설비학회논문지
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• 제30권1호
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• pp.79-86
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• 2016

In this paper, we propose a current-driven synchronous rectifier driver circuit for LLC resonant half-bridge converters. The proposed driver circuit detects a relatively low current in the primary side of the transformer although a large current is flowing in the secondary side. Due to this feature, the driver circuit has a simple circuit structure and stabilizes the switching operation with a logic-level switching voltages for the synchronous rectifier. The operation and performance of the proposed driver circuit are confirmed with a prototype of 1kW class LLC resonant half-bridge converter. The experimental results proved that the proposed synchronous rectifier driver method improves the power conversion efficiency by around 1% and reduces the internal power loss by 17W.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 전력전자학술대회 논문집
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• pp.59-60
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• 2014

In this paper, development of laser diode driver with 2.5kW rating is presented. The driver is configured with interleaved PFC converter, high frequency full bridge DC-DC converter, two laser diode drivers and ${\mu}$-processor based controller. The system has two laser diode drivers for providing high current and low current. High current driver delivers normal output power of diode; low current driver is for providing critical current of diode for long lifetime. Computer simulation and experiment was performed for verification, as the results, developed driver performs well.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1355-1357
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• 2005

This paper discusses Gate-driver circuit for improved switching characteristics. This resonant gate-driver recycles the energy stored in the gate capacitance to reduce the turn-off switching loss associated with a conventional gate-driver. Reducing the loss reduces the power consumption and hence the subsequent power dissipation in the resonant gate-driver. The design considerations of implementing a practical MOSFET gate-driver using this topology are discussed.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.542-545
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• 2004

The vibration reduction process for the driver comfort of a forklift truck is studied in this study since the related driver comfort is a primary design target in the vehicle design recently. However, the underlying study for a vibration analysis regarding to the driver comfort is still an element stage. Thus, a preceding large work has to be needed to apply the CAE technology for the detail vehicle design, and it prevents the vehicle optimal design. To reduce the proceeding large works, the evaluated process and required data are comply with the accumulated trouble shooting experiences in this study. Since the driver comfort is a human related problem, the human vibration index associated with analysis vibration result is additionally introduced as a driver comfort judgement value.

• International journal of advanced smart convergence
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• 제12권4호
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• pp.1-7
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• 2023

Large-size, organic light-emitting device (OLED) panels based on highly reliable gate driver circuits integrated using InGaZnO thin film transistors (TFTs) were developed to achieve ultra-high resolution TVs. These large-size OLED panels were driven by using a novel gate driver circuit not only for displaying images but also for sensing TFT characteristics for external compensation. Regardless of the negative threshold voltage of the TFTs, the proposed gate driver circuit in OLED panels functioned precisely, resulting from a decrease in the leakage current. The falling time of the circuit is approximately 0.9 ㎲, which is fast enough to drive 8K resolution OLED displays at 120 Hz. 120 Hz is most commonly used as the operating voltage because images consisting of 120 frames per second can be quickly shown on the display panel without any image sticking. The reliability tests showed that the lifetime of the proposed integrated gate driver is at least 100,000 h.

• 한국정보통신학회논문지
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• 제15권9호
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• pp.1985-1992
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• 2011

PE(Passive Entry)는 자동차 운전자가 스마트 키를 직접 사용하지 않고 차량의 문을 열거나 닫는 자동차 기술이다. PG(Passive Go)는 운전자가 스마트 키를 갖고 차량 내에 있을 때 시동을 걸거나 끄는 기술이다. 이러한 2가지 기능을 합쳐서 PEG라 부른다. PEG의 핵심 기술 중의 하나인 LF(Low Frequency) 안테나 구동기는 명령을 처리하는 디지털 블록과 sine 파를 발생시키는 아날로그 블록으로 구성되어 있다. LF 안테나 구동기의 디지털 블록은 MCU(혹은 ECU)로부터 명령을 받아서 요청된 명령을 수행하며, 내부의 FIFO 블록에 안테나 구동 관련 명령 및 데이터를 저장한다. FIFO에서 명령을 읽어내 이에 대응하는 조치를 취하며 변조된 LF 데이터를 아날로그 블록에 전달하면 아날로그 블록은 sine 파를 생성하여 안테나를 통해 외부로 전달한다. 설계된 LF 안테나 구동기용 디지털 블록은 기존의 제품과 비교하여 더 빠른 속도로 LF 데이터 전송을 수행할 수 있다. 이의 응용 분야는 자동차용 PEG 및 건물의 출입문 개폐에 활용이 가능하다.

• 한국컴퓨터정보학회논문지
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• 제17권9호
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• pp.149-156
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• 2012

본 논문에서는 전기습윤(Electrowetting) 디스플레이의 효율적인 생산을 위해 섬유형식의 전극들을 제안하고, 이러한 방법을 이용한 전기습윤 셀 구동형 플렉서블 디스플레이의 소스 드라이버 설계방법을 제안하였다. 전기습윤 셀 매트릭스는 임프린팅 방법에 의하여 PET 등의 Substrate 위에 구성하고 셀 매트릭스 사이의 간격에는 드라이버섬유, 습윤 전극섬유와 전도성 섬유를 가로와 세로로 배치하고, 교차점에는 전기적 접점을 구성하여 전기습윤 셀매트릭스가 구동되도록 하였다. 기존의 소스 드라이버에서는 각 채널당 R/2R방식의 DAC을 사용하므로 사용되는 소자의 수가 증가하여 집적도가 저하되는 단점이 있다. 따라서 본 논문에서는 채널당 소자의 수를 감소시켜 집적도를 높이고 비용을 절감할 수 있는 저 전력 소스 드라이버 설계방법을 제안하고 VHDL 프로그램을 이용한 시뮬레이션으로 타당성을 검증하였다.