• Journal of Korean Society of Transportation
• /
• v.14 no.2
• /
• pp.173-189
• /
• 1996

본 논문의 목적은 2차선 지방지역도로에서 사용 가능한 No-overtaking Model의 개발과 현장조사를 통한 우리 나라 2차선 도로의 교통류 특성의 규명이었다. No-overtaking Model을 개발하기 위해서는 이미 개발된 바 있는 Slow moving Vehicle Model의 이론적 틀을 근거로 하되 중차량을 따라 피동적으로 주행하는 일련의 차량군에 또 다른 중차량이 포함된 경우에 대해서도 분석이 가능하도록 개선했다. 경기도 일원에서 약 3 개월동안 조사한 현장조사에서 나타난 우리 나라 2차선 도로의 교통류 특성은 첫째로, 2차 선 교통류의 주요 MOE(Measures of Effectiveness)들은 교통량에 의해 비교적 정확하게 산정 가능하다는 것과, 둘째로 우리 나라의 주요 MOE값은 외국의 경우와 비교했을 때 대 체로 유사한 결가를 보이나 평균속도의 경우 최소 5km/h 최대 15km/h 정도와 차이를 나타 낸다는 것, 그리고 셋째로 차량군의 선두차량 85%의 경우 그 속도는 100.4km/h이고 추월 에 필요한 반대편차선 차량과의 여유 거리는 754.8m이라는 것이었다. 향후 연구과제로는 중차량의 속도분포를 확률 분포식으로 나타내는 경우의 지체시간, 추월율 등의 2차선 교통 류 MOE를 산출할 수 있는 Model을 개발하는 것이며 현재 5분 교통량으로 표시된 교통량 을 보다 많은 현장수집 자료를 통해 1시간 단위의 교통량을 기준으로 하여 MOE를 산정해 보는 것이다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2021.06a
• /
• pp.239-239
• /
• 2021

최근 기후변화로 인해 국지성 집중호우와 태풍의 발생빈도가 증가하고 있다. 특히 우리나라 국토는 전체면적 중 산지면적이 63%에 해당하여 산지에서 발생하는 산사태와 토석류에 취약한 실정이다. 이러한 피해를 사전에 예방·대비하기 위해 국내·외에서는 재해지도를 제작하여 관리하고 있지만 대부분의 재해지도는 격자형식으로 제작되어 있어 실무자들이 활용하기에는 다소 어려움이 있다. 따라서 본 연구에서는 산지재해에 취약한 강원도 강릉시 지방도를 대상으로 산림청에서 개발한 산사태위험지도와 토석류 위험지도를 중첩하여 복합재해지도를 제작하였다. 먼저 산사태위험지도에 유역의 개념을 도로에 적용하고서 지방도로를 200m 간격으로 분할하여 도로 중심으로 유역을 제작하였으며, 해당 유역에 산사태위험면적과 토석류위험면적 값을 이용하여 도로의 등급을 1등급(매우 위험) ~ 5등급(매우 안전)으로 분류하였다. 또한 복합재해지도 결과의 검증을 위해 SINMAP모형을 이용하여 오차율을 비교분석한 결과 15% 이내인 것으로로 나타났다. 본 연구는 복합재해에 대비 할 수 있는 유역의 개념을 적용한 재해지도를 제작하며 도로관리자의 숙련도에 상관없이 재해지도를 쉽게 이해하고 활용 할 수 있을 것으로 판단된다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.31 no.6_1
• /
• pp.483-491
• /
• 2013

By a development of car navigation systems and mobile or positioning technology, it increases interest in location based services, especially pedestrian navigation systems. Updating of digital maps is important because digital maps are mass data and required to short updating cycle. In this paper, we proposed change detection for different network data-sets based on areal feature matching. Prior to change detection, we defined type of updating between different network data-sets. Next, we transformed road lines into areal features(block) that are surrounded by them and calculated a shape similarity between blocks in different data-sets. Blocks that a shape similarity is more than 0.6 are selected candidate block pairs. Secondly, we detected changed-block pairs by bipartite graph clustering or properties of a concave polygon according to types of updating, and calculated Fr$\acute{e}$chet distance between segments within the block or forming it. At this time, road segments of KAIS map that Fr$\acute{e}$chet distance is more than 50 are extracted as updating road features. As a result of accuracy evaluation, a value of detection rate appears high at 0.965. We could thus identify that a proposed method is able to apply to change detection between different network data-sets.

• 한국노년학
• /
• v.25 no.2
• /
• pp.1-14
• /
• 2005

Objectives. The purpose of this study is to analyze the social-environment factors by region for cause of death elderly people in Korea and to study the factors of longevity. Methods. The study included 16 regions with a total of 177,585 elderly peoples. The data in this study was collected from The National Statistical Office, Republic of Korea. Results. Those regions the highest cerebrovascular disease were Incheon County in that order. The correlation of social-environment by cause of death factors were divorce (+0.832), air pollution of Pb ; lead (+0.879), smoking (+0.895), fatness (+0.666), local tax revenue (+0.756), air pollution of SO2 (+0.602) and dirt road (+0.863). Conclusions. We should learn to live long and healthily from residence harmonized with natural environment. Longevity of elderly peoples is to be fostered for the promotion of health by control the social-environment factors.

• Ecology and Resilient Infrastructure
• /
• v.4 no.3
• /
• pp.156-168
• /
• 2017

Linear development such as road and railway construction is considered to be an important factor in the dipersion agent of alien species. The purpose of this study is to investigate the effect of road project implementation on the introduction of alien plants. We selected the roadworks that have been completed or completed by more than 70% of the projects in the Han River basin environment agency. The alien plant data were divided into five phases: pre-construction (P0) and construction (P25, P50, P75, P100) according to the annual process rate. As the construction progresses, the naturalization rate, the urbanization index and the tendency of the number of exotic plants increase. Especially, alien plants were introduced rapidly at the beginning of the construction period, and the introduced species continued to appear until the construction was completed. Therefore, it is necessary to minimize the introduction of ailen plants by concentrating management of embankment process and the vegetation restoration process at the beginning of roadworks.

• International Journal of Highway Engineering
• /
• v.9 no.2 s.32
• /
• pp.77-87
• /
• 2007

Traffic accidents on freeway are occurred by various factors, and driver inattention is one of the most important factors causing traffic accidents. To warn drivers about unexpected dangerous events and diminish driver inattention problems, traffic safety facilities including warning and regulatory traffic signs; delineators; rumble strips are installed. In this study, the traffic safety effect of shoulder rumble sips were investigated using "Comparison Croup (C-G)" method developed by Hauer. Through the analyses, it was found that numbers of run-off-the road crashes were reduced as 2.43 crashes per year after the installation of shoulder rumble strips on the freeway. Based on the analysis results in this study, it was concluded that shoulder rumble strips on the freeway contribute to reduce traffic accidents, especially run-off-the road crashes.

• Journal of Korean Society of Transportation
• /
• v.30 no.5
• /
• pp.61-69
• /
• 2012

It is important for highway maintenance and safety assessment to get the accurate highway geometric information. However, it is difficult to acquire good highway geometric information due to missing blueprints or deteriorated highway sections. This research, to get highway geometric information rapidly, has developed a highway geometric analysis algorithm that uses data from vehicles with GPS-IMU integrated system. In conclusion, the result shows that 3.38% of error-ratio for the horizontal alignment and 0.083 absolute value difference for vertical grade comparing with highway drawings. Therefore, the result suggest that the developed method can be applied to the road safety inspection or road safety audit.

• The Journal of the Korea Contents Association
• /
• v.13 no.11
• /
• pp.944-956
• /
• 2013

Drivers need lots of information when they drive on the highway, however it is necessary and important to be provided information which is appropriate formation. In order to offer the suitable information, adequate size, quantity, and frequency of provided information are required for the drivers. To evaluate propriety of the expressed message of VMS that provides real-time traffic conditions, first of all, the amount of message about legibility distance and viewing should be estimated. In this research, drivers' characteristics of VMS message design were also reviewed to enhance the efficiency of VMS. And legibility distance, the amount of viewing information, and ratio of viewing information were analyzed on the currently operating VMS. The results of this study proposed that the appropriate size, quantity, and frequency were concluded by the legibility and memory of message on the real driving conditions. Consequently, these design methods of VMS could be expected to improve the transmitting capability of highway information to drivers.

• Journal of Korean Society of Transportation
• /
• v.28 no.1
• /
• pp.115-124
• /
• 2010

VDF(volume-delay function) is one of the most important factor to improve the reliability of traffic demand estimation because it is for estimation of link travel time based on the traffic volume variation. Because VDF of link except for freeway is applied as the parameter of BPR(bureau of public road) of U.S., it causes to deteriorate the accuracy of traffic demand estimation. The purpose of this paper is to establish new parameter of VDF based on the real-surveyed traffic data in order to improve the problem of the existing VDF. We suggest the reclassification of road hierarchy, the approach of traffic survey, the estimating method of VDF parameter, and the improvements of new VDF application. The new VDF allows us to estimate more realistic traffic situation in parts of demand, travel time and path between origin-destination.

• Journal of Korean Society of Transportation
• /
• v.33 no.6
• /
• pp.520-530
• /
• 2015

This paper formulates the methodologies to estimate optimal congestion tolls from long-run and short-run perspectives and applies them to the highways of Seoul. An optimal long-run congestion toll is estimated with an optimal volume-capacity-ratio to minimize the total costs which consist of two components: road construction and maintenance costs and traveler costs. By contrast, an optimal short-run congestion toll is estimated with a supply-demand equilibrium which is determined by using a speed-flow function and a disaggregate modal choice model. The results of a long-run analysis for the Seobu urban expressway suggest the optimal volume-capacity-ratio of 1.35 and the optimal congestion toll of 503 Won per automobile kilometer. By contrast, those of a short-run analysis for the Mia-ro urban arterial suggest 1.31 and 420 Won, respectively. Although our results are to some degree dependent on the interest rate and time value assumed, one basic conclusion holds up: the congestions toll tested could generate substantial gains in social welfare if applied to Seoul.