• 한국전기전자재료학회논문지
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• 제29권2호
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• pp.79-83
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• 2016

This research was analyzed thermal characteristics that was appointed disadvantage when smart LED driver ICs was packaged and we applied extracted thermal characteristics for optimal layout design. We confirmed reliability of smart LED driver ICs package without additional heat sink. If the package is not heat sink, we are possible to minimize package. For extracting thermal loss due to overshoot current, we increased driver current by two and three times. As a result of experiment, we obtained 22 mW and 49.5 mW thermal loss. And we obtained optimal data of 350 mA driver current. It is important to distance between power MOSFET and driver ICs. If thhe distance was increased, the temperature of package was decreased. And so we obtained optimal data of 3.7 mm distance between power MOSFET and driver ICs. Finally, we fabricated real package and we analyzed the electrical characteristics. We obtained constant 35 V output voltage and 80% efficiency.

• 드라이브 ㆍ 컨트롤
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• 제19권3호
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• pp.47-52
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• 2022

The C-ITS (Cooperative-intelligent Transport System) is a driver assistance system that prevents car accidents and enhances traffic conditions, via sharing traffic information between vehicles and roadway infrastructures. A CLAS (changing lane assistance system) for unprotected left-turn, is a C-ITS that assists a driver with safely changing lanes. This system addresses a driver's critical gap, that enables the system to express a driver's uncertainty. A driver's critical gap is a time that can be used in a threshold, to change a lane or not. Unfortunately, a driver's critical gap is difficult to use in a CLAS directly. This paper addresses a driver's critical gap, and how it can be applied in a CLAS for an unprotected left-turn.

• 한국전기전자재료학회논문지
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• 제29권2호
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• pp.75-78
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• 2016

This research was designed 700 level power MOSFET for smart LED driver ICs package. And we analyzed electrical characteristics of the power MOSFET as like breakdown voltage, on-resistance and threshold voltage. Because this research is important optimal design for smart LED ICs package, we designed power MOSFET with design and process parameter. As a result of this research, we obtained $60{\mu}m$ N-drift layer depth, 791.29 V breakdown voltage, $0.248{\Omega}{\cdot}cm^2$ on resistance and 3.495 V threshold voltage. We will use effectively this device for smart LED driver ICs package.

• 전기학회논문지
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• 제65권5호
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• pp.868-872
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• 2016

This paper presents the design of a BLDC motor driver applicable to various valve control systems using smart devices. BLDC motors are relatively small in size and have better performance than other motors. They help in reducing maintenance cost, installation costs and power consumption in plant facilities. The proposed driver is specially designed for BLDC motors using Smart Communication Platform. It adds smart features in the valve control system using BLDC motors such as multi-management, control, networking and monitoring in real time with the help of smart devices.

• 한국정보통신학회논문지
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• 제17권6호
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• pp.1441-1448
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• 2013

차량 전자 및 소프트웨어 기술 개발이 가속화됨에 따라 운전자가 자동차 운행을 위해 처리해야 하는 정보의 양이 증가하였다. 이는 운전자에게 안전 운전을 위한 다양한 정보를 제공해 주지만, 운전자의 집중력 감소와 운전 작업부하의 상승을 가져왔다. 운전자에게 필요한 이러한 정보들을 효과적으로 사용하기 위해서는 운전자 중심의 클러스터(계기판) 개발이 필요하다. 따라서 본 논문에서는 안드로이드 어플리케이션 기반 스마트 클러스터를 이용하여 전자기기가 익숙하지 못한 운전자나 고령의 운전자가 쉽게 사용할 수 있는 기반 구축 환경을 개발하고자 한다.

• 자동차안전학회지
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• 제12권1호
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• pp.52-61
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• 2020

In recent years, the increasing interest in health-care requires the industrial products to be well-designed ergonomically. In the commercial vehicle industry, several researchers have demonstrated the driver's posture has great effect on the orthopedic desease such as fatigue, back pain, scoliosis, and so on. However, the existing sensor systems developed for measuring the driver posture in real time have suffered from inaccuracy and low reliability issues. Here, we suggest our smart vehicle seat system capable of real-time driver posture monitoring by using the air bag sensor package with high sensitivity and reliability. The ergonomic numerical model which can evaluate a driver's posture has been developed on the basis of the human body segmentation method followed by simulation-based validation. Our experimental analysis of obtained pressure distribution of a vehicle seat under the different driver's postures revealed our smart vehicle system successfully achieved the driver's real-time posture data in great agreement with our numerical model.

• 대한인간공학회지
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• 제31권5호
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• pp.637-646
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• 2012

Objective: The aim of this study was to develop the adaptive device for severe physical disabilities using smart device in the driving simulator and its performance evaluation. Development of appropriate driving adaptive device for the people with serious physical limitation could contribute to maintain their community mobility. Background: There is lack of adaptive driving devices for the people with disabilities in Korea. However, if smart device systems like iPod and iPhone are used for driving a car, the people with serious physical limitations can improve their community mobility. Method: Both gyroscope and accelerometer from iPod were used to measure the tilted angle of the smart device for driving. Customized Labview program was also used to control three axis motors for steering wheel, accelerator and brake pedals. Thirteen subjects were involved in the experiment for performance evaluation of smart device in simulator. Five subjects had driver licenses. Another four subjects did not have driver licenses. Others were people with disabilities. Results: Average driving score of the normal group with driver license in the simulator increased 46.6% compared with the normal group without driver license and increased 30.4% compared with the disabled group(p<0.01). There was no significant difference in the average driving score between normal group without driver license and disabled group(p>0.05). Conclusion: The normal group with driver license showed significantly higher driving score than other groups. The normal group without driver license and disabled group could improve their driving skills with training in simulator. Application: If follow-up studies would be continued and applied in adapted vehicle for on road environment, many people with more severe disabilities could drive and improve the quality of life.

• 한국전자통신학회논문지
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• 제6권3호
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• pp.439-444
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• 2011

본 논문에서는 자동차에서 자동차의 속도, 엔진 회전속도, 연료, 엔진 온도, 연료 게이지, 회전표시등과 각종 경보 표시등 정보를 운전자에게 제공하는 차세대용 지능형 통합 스마트 모니터 시스템을 구현하였다. 구현한 지능형 스마트 HUD 모니터 시스템은 박막 트랜지스터 액정 표시 장치, 액정 표시 장치 배경 조명 발광 다이오드, 평면 미러, 특수 제작된 렌즈 및 구동회로로 구성되어 있으며, 운전자 안전성을 고려한 차세대 지능형 자동차 통합 HUD 시스템에 적용 가능함을 나타내었다.

• 디지털산업정보학회논문지
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• 제13권4호
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• pp.81-90
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• 2017

This paper presents a smart seat for correction of driver posture while driving. We introduce good postures with seat height, seat angle, head height, back of knees, distances of foot pedals, tilt of seat, etc. There have been some studies on correction of good posture while driving, effects of driving environment on driver's posture, sitting strategies based on seating pressure distribution, estimation of driver's standard postures, and others. However, there are a few studies on guide of good postures while driving for problem of driver's posture using machine leaning. Therefore, we suggest a smart seat for correction of driver's posture based on machine leaning, 1) developed the system to get postures by 10 piezoelectric effect element, 2) collect piezoelectric values from 37 drivers and 28 types of cars, 3) suggest 4 types of good postures while driving, 4) analyze test postures by kNN. As the results, we can guide good postures for bad or problems of postures while driving.

• 한국전기전자재료학회논문지
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• 제29권3호
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• pp.131-134
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• 2016

This research was analyzed thermal characteristics that was appointed disadvantage when smart LED driver ICs was packaged and we applied extracted thermal characteristics for optimal layout design. We confirmed reliability of smart LED driver ICs package without additional heat sink. If the package is not heat sink, we are possible to minimize package. For extracting thermal loss due to overshoot current, we increased driver current by two and three times. As a result of experiment, we obtained 22 mW and 49.5 mW thermal loss. And we obtained optimal data of 350 mA driver current. It is important to distance between power MOSFET and driver ICs. If thhe distance was increased, the temperature of package was decreased. And so we obtained optimal data of 3.7 mm distance between power MOSFET and driver ICs. Finally, we fabricated real package and we analyzed the electrical characteristics. We obtained constant 35 V output voltage and 80% efficiency.