• 대한전자공학회논문지SP
• /
• 제44권5호
• /
• pp.28-34
• /
• 2007

위성 영상에서 도로를 효과적으로 추출하기 위한 히스토그램 기반 도로 경계선 추출자를 제안하였다. 제안한 추출자를 이용해 도로 경계선 양측의 도로와 비도로 영역 각 화소의 방향성 히스토그램 차를 계산하고, 그 에지 강도 맵을 구하여 도로의 경계선을 추출하였다. 그리고 원영상과 분할된 도로 군집 영상의 에지 강도 맵을 계층적으로 구하여 직선 도로와 곡선 도로를 추출한 다음, 도로의 연결성을 기반으로 하여 전체 도로망을 구성하였다. 제안한 추출자는 칼라 유사도를 계산하는 기존 방법과 달리 히스토그램 차를 기반으로 하기 때문에 잡영에 강건하게 도로를 추출할 수 있으며, 도로 경계선의 위치와 도로 폭도 함께 추출할 수 있을 뿐만 아니라 도로군집을 자동식별하기 때문에 다양한 분광특성의 도로들도 쉽게 추출할 수 있다. 제안한 추출자를 이용하여 1m의 공간 해상도를 갖는 IKONOS 위성 영상에 대해 실험하여 잡영에 강건하게 도로가 추출됨을 확인하였고, 직선 도로 뿐만 아니라 곡선도로 추출도 용이함을 확인하였다.

• 전기학회논문지P
• /
• 제58권1호
• /
• pp.48-55
• /
• 2009

In order to keep safe driving conditions under road networks, there are several formations such as road structure, road surface condition, traffic occupancy and supplement of an accurate information of traffic status ahead To support safe-driving on each road formation, each formation is supplied with various information to help the driver. However, in some cases like rapid status change at local-scale geography, traffic information systems often displays insufficient information because of the lack of information correlation. In order to accurately aware the driver, all road formation must be in sync. It is important to supply accurate information to the driver because this information directly impacts the drivers on the road. This paper discusses the amber information to keep the least safety driving over road formations including tunnels and bridges. This paper also will propose the informations for safe-driving conditions, information linkage on the road and rule-base safety information, as ITS technology, being displayed for all drivers under the worst weather conditions.

• 대한교통학회지
• /
• 제8권2호
• /
• pp.7-25
• /
• 1990

In road traffic, road circumstances, vehicle, and driver are closely related each other. When road facilities are established in road planning, only road structure has been considered. However, relatively little work has been done regarding the relation between road circumstances and human with respect to a driver. This dissertation focuses on analysis of driver's visual characteristics to improve road circumstances. In this study, driver's visual characteristics are measured with eye-mark recorder and analyzed statistically. This study includes that visual characteristics, visual range, visual time, distribution of fixation duration, and visual moving angle with respect to road circumstances are established qualitatively and quantitatively by driving testing vehicle on streets, roads and high-ways. The main features of this study are : The driver's visual ranges are different over 10% depending on lane in multi-lanes. The visual range on two-lanes is more than twice as big as that on multi-lanes at 85% of whole vision. The right and left visual ranges by as big as that on multi-lanes at 85% of whole vision. The right and left visual ranges by as big as that on multi-lanes at 85% of whole vision. The right and left visual ranges by as big as that on multi-lanes at 85% of whole vision. The right and left visual ranges by speed are $34^{\circ}$ for 30-50km/hr, $28^{\circ}$ for 50-70km/hr, $22^{\circ}$ for 70-90km/hr and 16^{\circ} for over 90km/hr at 95% of visual rate. Accordingly, increasing speed results in narrow visual range.

• 한국방재학회 논문집
• /
• 제6권1호
• /
• pp.29-38
• /
• 2006

도시지역의 확산과 교통망의 발달로 도로안내표지의 효율적 정보제공이 요구되고 있고 안내체계의 효율성을 증대시킬 수 있는 안내지명의 선정원칙과 안내체계가 절실하다. 따라서 현재 수원시의 도로표지 안내정보의 실태를 파악하고 이용자들이 목적지를 찾아감에 있어 적절한 정보들을 제공받고 있는지 또한 제공된 정보들은 체계적인 연속성을 가지고 있는지 조사하였다. 본 연구에서는 도로이용자가 찾고자하는 한 지점을 중심으로 도로표지판의 안내정보의 적절성과 연계성 및 출현빈도에 관한 조사를 실시하였다. 즉 수원시청을 최종목적지로 하여 주변도시 접경부 안양시, 오산시, 안성시, 용인시, 성남시 등지에서 수원시청까지 6개의 간선도로에 설치된 도로표지판 중 방향예고표지와 방향표지, 시설안내표지등을 분석하였다 그 결과 도로표지규정의 안내지명선정 원칙에 의한 랜드마크나 1등급으로 분류되는 지명들은 상대적으로 찾기가 다소 용이하나 그 외의 이용자가 원하는 지명을 알아내는데 상당히 어려움이 있는 것으로 조사되었다. 이는 안내지명만으로 현 위치를 파악하기가 어렵고 제시된 안내지명이 직진방향에서 만날 수 있는 지명뿐 아니라 좌회전 혹은 우회전을 해야만 만날 수 있는 지명일 경우 방향을 알 수가 없어 비효율적인 정보가 제공되고 있는 것으로 조사되었다. 게다가 선정된 안내지명마저도 출현빈도의 적정성에 문제가 있고, 표지간의 연계가 이루어지고 있지 않아 도로이용자에게 많은 불편을 주고 있는 것으로 조사되었다.

• Wind and Structures
• /
• 제20권2호
• /
• pp.191-211
• /
• 2015

Several frameworks for the dynamic analysis of wind-vehicle-bridge systems were presented in the past decade to study the safety or ride comfort of road vehicles as they pass through bridges under crosswinds. The wind loads on the vehicles were generally formed based on the aerodynamic parameters of the stationary vehicles on the ground, and the wind loads for the pure bridge decks without the effects of road vehicles. And very few studies were carried out to explore the dynamic effects of the aerodynamic interference between road vehicles and bridge decks, particularly for the moving road vehicles. In this study, the aerodynamic parameters for both the moving road vehicle and the deck considering the mutually-affected aerodynamic effects are formulized firstly. And the corresponding wind loads on the road vehicle-bridge system are obtained. Then a refined analytical framework of the WVB system incorporating the resultant wind loads, a driver model, and the road roughness in plane to fully consider the lateral motion of the road vehicle under crosswinds is proposed. It is shown that obvious lateral and yaw motions of the road vehicle occur. For the selected single road vehicle passing a long span bridge, slight effects are caused by the aerodynamic interference between the moving vehicle and deck on the dynamic responses of the system.

• 한국지반환경공학회 논문집
• /
• 제5권3호
• /
• pp.41-50
• /
• 2004

침투거동에 대한 연구는 우기시 도로성토사면의 안정성 여부에 매우 중요하다. 본 연구는 도로성토사면의 몇가지 사례들에 대한 침투거동과 사면안정성의 분석을 근거로 하여 좀더 안정적인 도로성토사면의 유지 방안을 제안한 것이다. 본 연구 사례에서 선택한 도로붕괴단면은 가장 일반적인 평지부 도로성토사면의 경우와 산지부에 대한 도로성토사면인 경우이다. 본 연구의 결과를 요약하면 다음과 같다. 평지부 성토사면은 강우시 표면으로부터 침투가 시작되어 점차 성토 제체 내로 확대되었으며, 이때 도로성토사면의 침투거동은 불포화 흐름이론을 근거로 해석하였다. 특히 평지부 성토사면은 호우기간동안 사면표면에서의 강우침투로 인해 좀더 불안정하게 되었다. 산지부 성토사면의 경우 사면표면부로부터의 침투거동을 고려하여 해석하였으며, 사면표면부로부터의 강우침투로 인해 사면불안정이 증가되었음을 알 수 있었다. 산지부 성토사면의 경우 투수성이 큰 재료를 이용하여 원지반에 설치한 배수층은 도로 성토사면의 안정성 증대에 유용한 영항을 줄 것으로 판단된다.

• Acta Via Serica
• /
• 제7권1호
• /
• pp.83-104
• /
• 2022

This article attempts to explain current social perceptions in Mexico about the Silk Road. Based on a critical geopolitics approach, the author analyzes how the idea of the Silk Road is socially constructed in Mexican popular geopolitics, focusing on studying digital mass media between 2013 and 2020. The main research questions are: how is the Silk Road notion constructed in Mexican popular geopolitics and what are the geopolitical implications for Mexico? The article discovers that in Mexico, the idea of the "Silk Road" is profoundly close to the idea of the Belt and Road Initiative (BRI) given China's geostrategic discourse that constructs the BRI as a "New Silk Road". The article also argues that Mexico's social-political agency to deal with China may be hindered by divergent social perceptions in favor and against the "Silk Road".

• 농업과학연구
• /
• 제44권4호
• /
• pp.504-512
• /
• 2017

Forest roads are essential for forest resource management. This study investigated and compared forest road and road policy data in Korea and the United States to improve future forest road policies in Korea. As compared to the United States (9.5 m/ha), Korea has much lower forest road density (3.19 m/ha) and has been actively constructing new forest roads. The Korea Forest Service leads forest road policy in Korea by providing subsidies for new road construction in non-national forests. The budget for forest roads accounted for 9.1% of the total Korea Forest Service budget in 2010 - 2015 and 73.5% of it was used for new road construction. Korean forest road policies have been distinctively changed over the past decades; e.g., an increase in forest road mileage in the 1990s, an increase in forest road standards in the 2000s, and an increase in the mileage of higher standard roads in the 2010s. In comparison to Korea, the United States has focused on road maintenance and road decommissioning since 2001. The budget for forest roads accounted for 2.9% of the total USDA Forest Service budget in 2011 - 2016 and 82.2% of it was used for operations and maintenance. Our study results suggest that forest road policies in Korea should start focusing on road maintenance and decommissioning, if needed.

• 디지털산업정보학회논문지
• /
• 제9권1호
• /
• pp.79-86
• /
• 2013

In this paper which it is relating to the DSRC system based road side equipment, we propose the protocol stack architecture of road side equipment and the process structure of the main RM, L7 and LLC layers which is road side equipment device as well. And also we design the signal flow and data-transfer process as well between road side equipment and on board equipment to describe the installation process between road side equipment and von board equipment based on DSRC system. Thus, it is possible to provide various application services between intelligent transportation systems of road side equipment and local server, as well as it enables the local server managing the memorys of on board equipment which entry in service area thru the road side equipment.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.34-39
• /
• 2002

Road information is very important for topographic mapping, transportation application, urban planning and other related application fields. Therefore, automatic detection of road networks from spatial imagery, such as aerial photos and satellite imagery can play a central role in road information acquisition. In this paper, we use least squares correlation matching alone for road center tracking and show that it works. We assumed that (bright) road centerlines would be visible in the image. We further assumed that within a same road segment, there would be only small differences in brightness values. This algorithm works by defining a template around a user-given input point, which shall lie on a road centerline, and then by matching the template against the image along the orientation of the road under consideration. Once matching succeeds, new match proceeds by shifting a matched target window further along road orientation at the target window. By repeating the process above, we obtain a series of points, which lie on a road centerline successively. A 1m resolution IKONOS images over Seoul and Daejeon were used for tests. The results showed that this algorithm could extract road centerlines in any orientation and help in fast and exact he ad-up digitization/vectorization of cartographic images.