• Proceedings of the KIEE Conference
• /
• 2007.10a
• /
• pp.457-458
• /
• 2007

우리는 동영상에서 낮은 연산량으로 강인하게 움직이는 물체를 탐지하는 방법을 제안한다. 동영상에서 움직이는 물체를 탐지하기 위한 많은 방법들이 제안되었는데, 각각의 방법은 접근 방법에 따라 탐지 성능과 처리속도에 trade-off가 존재한다. 최근 폭넓게 사용되고 있는 가우시안 혼합모델을 이용한 배경모델생성 법의 경우 탐지성능은 우수하나 연산량이 많고, 차영상(Temporal difference)을 이용한 방법은 연산량은 적으나 노이즈에 민감하게 반응한다. 또한 알고리즘 특성상 탐지된 물체에 Hole과 Ghost가 발생하는 문제가 있다. 우리는 이러한 단점들을 극복하기 위해 이 두 가지 알고리즘을 효율적으로 결합하여 움직이는 물체를 탐지하였다. 실험은 사람, 차, 오토바이와 같이 실외환경에서 흔히 움직이는 물체로 탐지되는 요소들이 다양한 환경에서 실시하였으며, 실험한 결과 배경영역에서 발생하는 노이즈는 효과적으로 제거하면서 움직이는 물체를 탐지하였다.

• Annual Conference of KIPS
• /
• 2023.11a
• /
• pp.884-885
• /
• 2023

모바일 로봇은 제조, 물류, 건설 등 다양한 산업 분야에서 중요한 역할로 사용되고 있으며 연구분야에 있어서도 데이터 수집, 실험 수행, 환경 탐사, 자율주행 알고리즘 개발 등에도 사용되고 있다. 본 연구에서는 실외 환경에서 고중량 적재물을 이동시킬 수 있는 모바일 로봇 플랫폼을 설계하고 제작하였다. 또한 설계 정보와 제작 과정 등을 여러 사람들이 활용 가능하도록 공유한다. 개발된 모바일 로봇 플랫폼은 대부분의 부품들이 시중에서 쉽게 구할 수 있는 규격 부품을 사용하였기 때문에 공유된 설계 정보를 이용하여 많은 연구자들이 모바일 로봇 플랫폼을 제작하여 활용할 수 있도록 하는데 목적이 있다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.22 no.4
• /
• pp.194-210
• /
• 2023

LiDAR plays a key role in autonomous vehicles, where it is used to detect the environment in place of the driver's eyes, and its role is expanding. In recent years, there has been a growing need to test the performance of LiDARs installed in autonomous vehicles. Many LiDAR performance tests have been conducted in simulated and indoor(lab) environments, but the number of tests in outdoor(field) and real-world road environments has been minimal. In this study, we compared LiDAR performance under the same conditions lab and field to determine the relationship between lab and field tests and to establish the characteristics and roles of each test environment. The experimental results showed that LiDAR detection performance varies depending on the lighting environment (direct sunlight, led) and the detected object. In particular, the effect of decreasing intensity due to increasing distance and rainfall is greater outdoors, suggesting that both lab and field experiments are necessary when testing LiDAR detection performance on objects. The results of this study are expected to be useful for organizations conducting research on the use of LiDAR sensors and facilities for LiDAR sensors.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2008.04a
• /
• pp.109-110
• /
• 2008

• Journal of IKEEE
• /
• v.27 no.3
• /
• pp.340-344
• /
• 2023

In this paper, we propose a study on the development of deep learning structure to secure visibility of outdoor LED display board according to weather change. The proposed technique secures the visibility of the outdoor LED display board by automatically adjusting the LED luminance according to the weather change using deep learning using an imaging device. In order to automatically adjust the LED luminance according to weather changes, a deep learning model that can classify the weather is created by learning it using a convolutional network after first going through a preprocessing process for the flattened background part image data. The applied deep learning network reduces the difference between the input value and the output value using the Residual learning function, inducing learning while taking the characteristics of the initial input value. Next, by using a controller that recognizes the weather and adjusts the luminance of the outdoor LED display board according to the weather change, the luminance is changed so that the luminance increases when the surrounding environment becomes bright, so that it can be seen clearly. In addition, when the surrounding environment becomes dark, the visibility is reduced due to scattering of light, so the brightness of the electronic display board is lowered so that it can be seen clearly. By applying the method proposed in this paper, the result of the certified measurement test of the luminance measurement according to the weather change of the LED sign board confirmed that the visibility of the outdoor LED sign board was secured according to the weather change.

• Journal of the Korean housing association
• /
• v.18 no.3
• /
• pp.91-102
• /
• 2007

The purpose of this study was to analyze the relationship between outdoor play environments and child's play behaviors. The data were collected by this study included field measurement survey, and non-participatory observation from 8 child care centers in Seoul. The field measurement survey were conducted from February 20 to March 20, 2005, whereas non-participatory behavior observation were conducted from June 15 to July 10, 2005. The major results showed the following. 1) Most of child care centers were too small, did not use the adequate surfacing to play various activities, and were made of play equipment setting. 2) Child's play behavior focused on functional play activity and construction play activity. 3) The relationship between outdoor play environments and child's play behaviors showed that small outside play environment with monotonous construction of play setting produced functional play behaviors on children. However, in some cases, despite the small and monotonous play area, diverse play behaviors were observed. These playgrounds at least differed from others in that they provided the place where multi purpose play was possible. This finding shows that multi purpose play areas can be an alternative in small playground environment.

• Proceeding of Spring/Autumn Annual Conference of KHA
• /
• 2006.11a
• /
• pp.432-437
• /
• 2006

The purpose of this study was to analyze the relationship between outdoor play environments and child's play behaviors. The data were collected by this study include field measurement survey, and non-participatory observation from 8 child care centers in Seoul. The field measurement survey were conducted from February 20 to March 20, 2005, whereas non-participatory behavior observation were conducted from June 15 to July 10, 2005. The major results showed the following. 1)Most of child care centers were too small, did not use the adequate surfacing to play various activities, and were made of play equipment setting. 2)Child's play behavior focused on functional play activity and construction play activity. 3)The relationship between outdoor play environments and child's play behaviors showed that small outside play environment with monotonous construction of play setting produced functional play behaviors on children. However, in some cases, despite the small and monotonous play area, diverse play behaviors were observed. These playgrounds at least differed from others in that they provided the place where multi purpose play was possible. This finding shows that multi purpose play areas can be an alternative in small playground environment.

• Journal of the Korean Solar Energy Society
• /
• v.39 no.3
• /
• pp.19-27
• /
• 2019

In commercial areas, outdoor units are typically installed close to one another in the narrow space between buildings due to insufficient regulations. This makes it difficult to ventilate the discharge airflow, which may lead to deterioration of the performance of outdoor units. This study conducted CFD simulation to analyze the thermal environment according to the installation distance of the outdoor unit. The outdoor unit was installed in the space between buildings, and the thermal environment was analyzed by changing installation distance and wind speed. The performance of the outdoor unit was evaluated by measuring the on-coil temperature. The results show that the closer the distance between outdoor units, the higher the condenser on-coil temperature. Also, the on-coil temperature appeared to rise dramatically at lower wind speed.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 2002.11a
• /
• pp.125-128
• /
• 2002

과거 사무실과 같은 실내 환경에서 무선을 이용하여 네트워크 접속을 위해 개발된 무선랜 기술이 최근 실외 공중망 서비스와 연계되며 미국을 비롯하여 유럽 등지에서 신규 통신서비스 개발이 활발히 사용되고 있다. 이러한 이동환경에 적합한 선불과금 방안은 선불제 요금제도의 필요성이 대두되면서 중요한 연구과제가 되고 있다. 본 논문에서는 무선랜 이동환경에 적합한 선불과금 모델을 제안하고 검증한다. 제안된 과금 모델은 차세대 이동통신의 이동환경에서 적용이 가능한 인터넷 IP 과금 방안을 연구하는데 기반 기술로 이용될 것이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2008.05a
• /
• pp.473-476
• /
• 2008

USN(Ubiquotous Sensor Network) has been applied to various fields of industries such as logistics, environment management, traffic management, as well as IT industries including home network and telematics. Among the important techniques required to implement aforementioned applications, location management scheme is essential. In this paper, we proposed and implemented a new location measurement scheme based on RSSI of sensor node for campus car location management.