• 한국가시화정보학회지
• /
• 제7권1호
• /
• pp.3-8
• /
• 2009

Most vehicles have a heating, ventilating and air conditioning (HVAC) device to control the thermal condition and to make comfortable environment in the passenger compartment. The improvement of ventilation flow inside the passenger compartment is crucial for providing comfortable environment. For this, better understanding on the variation of flow characteristics of ventilation air inside the passenger compartment with respect to various ventilation modes is strongly required. Most previous studies on the ventilation flow in a car cabin were carried out using computational fluid dynamics (CFD) analysis or scale-down water-model experiments. In this study, whole ventilation flow discharged from the air vent of a real passenger car was measured using a special PIV (particle image velocimetry) system for large-size FOV (field of view). Under real recirculation ventilation condition, the spatial distributions of stream-wise turbulence intensity and mean velocity were measured in the vortical panel-duct center plane under the panel ventilation mode. These experimental data would be useful for understanding the detailed flow structure of real ventilation flow and validating numerical predictions.

• 한국인터넷방송통신학회논문지
• /
• 제13권5호
• /
• pp.9-15
• /
• 2013

본 논문에서는 사고 자동인식 서비스 제공과 위험 운전 여부 등을 통하여 운전자의 운전습관을 교정해 주고 사고 전후의 동영상을 재현하는 확장성이 높은 모바일 블랙박스 DVR (SMBD, Smart Mobile Blackbox DVR) 컴퓨터의 모델링 설계를 하였다. SMBD는 임베디드 시스템에 무선 기능을 탑재하여 차량이 휴면상태에서도 사고발생 지점과 영상정보를 무선통신을 이용하여 24시간 관제센터에 통보함으로써 긴급구난 서비스 및 교통정보를 제공 받을 수 있다. 또한 차량 ECU(Electronic Control Unit)의 차량정보 및 센서 데이터와 연동하여 무선 eCall (Emergency Call) 서비스를 실현할 수 있다.

• 한국전자통신학회논문지
• /
• 제12권6호
• /
• pp.1093-1098
• /
• 2017

LED를 광원으로 사용하는 장비들은 다른 광원 대비 기능적, 경제적 효율성으로 인하여 많은 곳에 널리 활용되고 있다. 효과적인 LED 조명 제어를 위해 다양한 유무선 통신 프로토콜이 사용될 수 있다. 최근에는 스마트폰 시대가 열리면서 다양한 원격 조정 어플리케이션이 등장하고 있다. 본 논문에서는 스마트 폰 어플리케이션을 이용하여 LED 등의 다양한 기능을 제어하고 특별한 패턴의 정보 display 기능을 실내 LED 등에 추가하여 일상생활에서 더욱 효율적으로 사용하는 것을 목적으로 한다.

• 디자인학연구
• /
• 제15권2호
• /
• pp.205-212
• /
• 2002

현대 소비자들은 물질적 풍요와 함께 자신의 취향과 기호에 맞는 소비 제품을 선호하게 되었다. 따라서 이제는 기능, 품질, 가격만으로는 소비자들의 감성을 만족 시켜 줄 수 없으므로 소비자의 필요욕구(Needs), 또는 내재욕구(Seed)를 충족시킬 수 있는 제품 개발 기법이 요구되었다. 이에 대한 해결 방법의 하나의 대안으로 감성공학이라 할 수 있다. 이에 본 연구에서 선정된 제품은 자동차용 방향제 용기로 경제가 풍요로워짐에 따라 여유로운 생활을 하게 되면서 생겨난 신 자동차 문화 속에 자신의 내부를 '안락한' '쾌적한' 실내 환경을 요구하는 소비자들의 욕구 충족 기능으로서 실용품이자 액세서리로 등장한 제품이기 때문이다. 따라서 자동차용 방향제 용기 제품에 대하여 감성공학 방법에 의해 소비자가 제품에 대해 가지고 있는 감성 이미지를 추출함으로써 소비자에게 만족시킬 수 있는 디자인 방향 제시를 가능케 하였다.

• 한국소음진동공학회논문집
• /
• 제21권2호
• /
• pp.178-185
• /
• 2011

Optical image stabilization is a device to compensate the camera movement in the exposure time. The compensation is implemented by movable lens or image sensor that adjusts the optical path to the camera movement. Generally, the camera is moved by a handshake, thus the handshake is considered as an external disturbance. However, there are many other vibrations such as car and train vibration. In this paper, the optical image stabilization system in high frequency region is presented. Notch filter and lead compensator are designed and applied to improve the stability without changing the actuator. To verify the performance of the optical image stabilization system in high frequency region, the experiment equipment with moving object is established. It is confirmed that the opticalimage stabilization system does not diverge at the resonance frequency.

• 제어로봇시스템학회논문지
• /
• 제22권9호
• /
• pp.699-704
• /
• 2016

In this paper, we propose a development method for a drowsiness detection system using retinex theory and edge information for vehicle safety. Detection of a drowsy state of a driver is very important because the drowsiness of driver is often the main cause of many car accidents. After acquiring an image of the entire face, we executed the pre-process step using the retinex theory. We then applied a technique for the detection of the white pixels using edge information. Experimental results showed that the proposed method improved the accuracy of detecting drowsiness to nearly 98%, and can be used to prevent a car accident caused by the driver's drowsiness.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2010년도 춘계학술대회 논문집
• /
• pp.425-426
• /
• 2010

Recently, Most of diverse noise of vehicles has decreased competitively according to development of the automotive manufacturing technology. Especially, Passenger car manufacturers has been conducting buzz, squeak and rattle(BSR) noise test as a method of the noise evaluation tests to reduce an unpleasant sound from interior parts on the driving the car. This paper suggest a evaluation method for detecting position of noise source from measured noise signals of vehicle seats during random excitation BSR test. Hereby the BSR test procedure used the test regulation of 'G' company. The detection of noise source positions used the Sound image equipment. Through suggested the test method on this paper, an accurate analysis of noise source occurred in the BSR test will be possible.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집B
• /
• pp.146-151
• /
• 2001

The Grand-Touring is a game motion simulator that simulates the race-car driving motion with three hydraulic cylinders which connect the platform and base in parallel. Its motion control system consists of the PC-based main controller and micro-controller based sub-controller. The former one process the dynamic image of race-car in response to the driver's action and computes the reference command for each cylinder and the latter one is designed for the tracking control of hydraulic cylinder and interfacing the auxiliary signals between various sensors/actuator and main controller. In this research, we developed the sub-controller that implements the required functions of Grand-Touring and prove the overall performance with experiments.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제11권6호
• /
• pp.3188-3207
• /
• 2017

In this paper, we propose an image enhancement algorithm to improve license plate extraction rate in various environments (Day Street, Night Street, Underground parking lot, etc.). The proposed algorithm is composed of image enhancement algorithm and license plate extraction algorithm. The image enhancement method can improve an image quality of the degraded image, which utilizes a histogram information and overall gray level distribution of an image. The proposed algorithm employs an interpolated probability distribution value (PDV) in order to control a sudden change in image brightness. Probability distribution value can be calculated using cumulative distribution function (CDF) and probability density function (PDF) of the captured image, whose values are achieved by brightness distribution of the captured image. Also, by adjusting the image enhancement factor of each part region based on image pixel information, it provides a function that can adjust the gradation of the image in more details. This processed gray image is converted into a binary image, which fuses narrow breaks and long thin gulfs, eliminates small holes, and fills gaps in the contour by using morphology operations. Then license plate region is detected based on aspect ratio and license plate size of the bound box drawn on connected license plate areas. The images have been captured by using a video camera or a personal image recorder installed in front of the cars. The captured images have included several license plates on multilane roads. Simulation has been executed using OpenCV and MATLAB. The results show that the extraction success rate is more improved than the conventional algorithms.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
• /
• pp.426-439
• /
• 1996

In this paper, we propose a simple algorithm to calculate the numbers of the passing cars by using an image processing sensor for the digital black and white images with 256 tone level. Shadow is one of the most troublesome factor in image processing. By differencing the tone level, we cannot discriminate between the body of the car and its shadow. In our proposed algorithm, the area of the shadow is excluded by recognizing the position of each traffic lane. For real-time operation and simple calculation, two lines of the tone level are extracted and the existences of cars are recognized. In the experimental application on a high-way, the recognition rate of the real-time operation is more than 94%.