• 한국인터넷방송통신학회논문지
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• 제14권3호
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• pp.81-88
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• 2014

요즈음 교통사고를 줄이기 위하여 IT 기술을 이용한 교통사고 연구가 많이 진행되고 있다. 특히, 고속도로에서 교통사고를 예방하기 위해서 눈이나 비가 올 경우에는, 날씨조건을 고려한 최적의 교통속도를 실시간으로 산출해야한다. 본 논문에서는 교통사고를 예방하기 위하여 결빙 구간 및 안개구간 자동 경고 안내 방송 시스템을 웹기반에서 모의실험 하였다. 뿐만 아니라, 퍼지 추론 규칙을 이용하여서, 최악의 날씨 조건에서도 교통사고를 예방 할 수 있도록, 운전자 에게 최적의 교통 안전속도를 실시간으로 운전자에게 알려 주는 모의실험을 개발하였다.

• 한국항공운항학회지
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• 제21권1호
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• pp.68-73
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• 2013

This study is to make a protype of forecast guidance for forecasters from analyzing the characteristics of Korea Fog. The trend of Korea fog showed the decline in the number of foggy days and the duration time, the gradient is -1.24days/year under 3 miles and -0.98days/year under 1 mile and -1.64hours/year under 3 miles and -3.18hours/year under 1 mile in duration time in 27 ROKAF base. To find the protype of inland and coastal forecast guidance, Daegu base as a representation of the inland base and Gangneung base as the representation of the coastal base were chosen. For Daegu base, the mixture of relative humidity, sky condition, and the position of high pressure were selected for the forecast guidance. For Gangneung base, pressure pattern, sea surface temperature, sea currents, and 850hPa temperature patterns were selected for the forecast guidance.

• 한국정보통신학회논문지
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• 제2권3호
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• pp.359-365
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• 1998

The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO & RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather, Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation, and partly modified 900MHz band cordless phone circuit.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1998년도 춘계종합학술대회
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• pp.365-370
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• 1998

The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather. Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation. and partly modified 900MHz band cordless phone circuit.

• 한국전자통신학회논문지
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• 제13권6호
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• pp.1257-1262
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• 2018

본 논문에서는 보안 감시 카메라 영상을 활용하여 화재 검출을 위한 효과적인 심층학습 방안을 제안한다. AlexNet 모델을 기준으로 효과적인 화재 검출을 위한 커널 크기와 커널 이동 간격의 변화에 따른 분류 성능을 비교 분석한다. 학습을 위한 데이터셋은 정상과 화재 2가지 클래스로 분류한다, 정상 영상에는 구름과 안개 낀 영상을 포함하고, 화재 영상에는 연기와 화염을 각각 포함한다. AlexNet 모델의 첫 번째 계층의 커널 크기와 이동 간격에 따른 분류 성능 분석 결과 커널의 크기는 크고, 이동 간격은 작을수록 화재 분류 성능이 우수한 것을 확인할 수 있다.

• 전기전자학회논문지
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• 제23권3호
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• pp.984-987
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• 2019

최근 사물인식, 차선인식을 기반한 자율 주행 기술이 각광받고 있다. 하지만 안개가 자욱한 날씨에는 주변 사물을 인지하기 어렵기 때문에 안개제거 기술이 필요하다. 안개 제거 기술은 현재 여러 방면으로 연구되고 있으며, 단일 영상을 기반한 안개제거 알고리즘이 대표적이다. 본 논문에서는 안개 입자 맵을 추정하여 실시간으로 안개 제거를 하기 위한 하드웨어를 설계한다. 제안하는 하드웨어 구조는 누적 히스토그램 방식을 기반한 필터를 구현하여 필터의 window 크기가 커져도 하드웨어 크기에 영향을 미치지 않는 구조를 가진다. 하드웨어 설계는 XILINX사의 xc7z045-ffg900을 목표 보드로 하여 FPGA 구현을 했다.

• 한국멀티미디어학회논문지
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• 제25권9호
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• pp.1266-1272
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• 2022

With the recent development of computer vision technology, image processing-based mechanical devices are being developed to realize autonomous driving. The camera-taken images of image processing-based machines are invisible due to scattering and absorption of light in foggy conditions. This lowers the object recognition rate and causes malfunction. The safety of the technology is very important because the malfunction of autonomous driving leads to human casualties. In order to increase the stability of the technology, it is necessary to apply an efficient haze removal algorithm to the camera. In the conventional haze removal method, since the haze removal operation is performed regardless of the haze concentration of the input image, excessive haze is removed and the quality of the resulting image is deteriorated. In this paper, we propose an automatic haze removal method that removes haze according to the haze density of the input image by applying Ngo's Haziness Degree Evaluator (HDE) to Kim's haze removal algorithm using Hazy Particle Map. The proposed haze removal method removes the haze according to the haze concentration of the input image, thereby preventing the quality degradation of the input image that does not require haze removal and solving the problem of excessive haze removal. The superiority of the proposed haze removal method is verified through qualitative and quantitative evaluation.

• Journal of Information Processing Systems
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• 제19권4호
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• pp.417-426
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• 2023

To improve the effect of image restoration and solve the image detail loss, an image dehazing enhancement algorithm based on mean guided filtering is proposed. The superpixel calculation method is used to pre-segment the original foggy image to obtain different sub-regions. The Ncut algorithm is used to segment the original image, and it outputs the segmented image until there is no more region merging in the image. By means of the mean-guided filtering method, the minimum value is selected as the value of the current pixel point in the local small block of the dark image, and the dark primary color image is obtained, and its transmittance is calculated to obtain the image edge detection result. According to the prior law of dark channel, a classic image dehazing enhancement model is established, and the model is combined with a median filter with low computational complexity to denoise the image in real time and maintain the jump of the mutation area to achieve image dehazing enhancement. The experimental results show that the image dehazing and enhancement effect of the proposed algorithm has obvious advantages, can retain a large amount of image detail information, and the values of information entropy, peak signal-to-noise ratio, and structural similarity are high. The research innovatively combines a variety of methods to achieve image dehazing and improve the quality effect. Through segmentation, filtering, denoising and other operations, the image quality is effectively improved, which provides an important reference for the improvement of image processing technology.

• 조형예술학연구
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• 제6권
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• pp.100-118
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• 2004

Mi Fu, who was associated with Wen Tong, invented the Mijoem Technique (Dotting Technique) in landscape painting with his son Mi Youren. His landscapes, which referred to Dong Yuan's landscape technique and was inspired by the scenery of Jiang Nan, illustrate the mood of a cloud-covered foggy landscape by liberally applying dots with ink. 'Chunsansoesong' which is considered done by Mi Fu, clearly shows the virtues of ink painting's spreading, absorbing and omission techniques. This simply rendered landscape - whose mountains and hills are wrapped in both clouds and fog - displays exquisiteness by using small dots. In 'Chunsansoesong', the characteristics of Song painting: a 'vital energy', a 'poem within the painting', a 'beauty of margin', a 'beauty of one brush stroke, and a 'display of inner meanings' are implicatively expressed This is because it's simple but connotatively delineative. There is the characteristic of a 'poem within the painting' when analyzing the both fragmented and combined 'Chunsansoesong'. The margins support an imaginative space as the height of the mountains get higher which result in deepening both the width and depth of the landscape space. Furthermore, the soft thickness of ink, clouds, pine trees, and pavilion evoke delineative feelings and a desire to write a poem Every thing in 'Chunsansoesong' is enveloped in both clouds and fog regardless of its distance and this delivers boundless feelings of Oriental mystery and urges a desire for 'writing a poem'. The pavilion that faces the cloud and fog-bound mountains especially flames the poetic urge further by inducing viewers' poetic imaginations. As we reviewed above, 'Chunsansoesong's cloud and fog-covered landscape is a good example that clearly showcases the characteristics of a 'Poem within the Painting'.

• 한국지구과학회지
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• 제26권2호
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• pp.149-159
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• 2005

Simultaneous observations of MODIS (Moderate-resolution Imaging Spectroradiometer) onboard the Aqua and Terra satellites and weather station at ground near the Inchon International Airport (37.2-37.7 N, 125.7-127.2 E) during the period from December 2002 to September 2004 have been utilized in order to analyze the characteristics of satellite-observed infrared (IR) and visible data under fog and clear-sky conditions, respectively. The differences $(T_{3.7-11})$ in brightness temperature between $3.75{\mu}m\;and\;11.0{\mu}m$ were used as threshold values for remote-sensing fog (or low clouds) from satellite during day and night. The $T_{3.7-11}$ value during daytime was greater by about 21 K when it was foggy than that when it was clear, but during nighttime fog it was less by 1.5 K than during nighttime clear-sky. The value was changed due to different values of emission of fog particles at the wavelength. Since the near-IR channel at $3.7{\mu}m$ was affected by solar and IR radiations in the daytime, both IR and visible channels (or reflectance) have been used to detect fog. The reflectance during fog was higher by 0.05-0.6 than that during clear-sky, and varied seasonally. In this study, the threshold values included uncertainties when clouds existed above a layer of fog.