• Journal of Korean Society of Transportation
• /
• v.23 no.7 s.85
• /
• pp.17-33
• /
• 2005

Highway design speed is a very important design element which determines highway design level. When determining highway design speed, one would estimate it utilizing the most likelihood of design speed and vehicle operating speed relationship. Existing operating speed prediction models only include highway geometric characteristics and their impacts on speed, which usually can not consider the impact of highway design speed on surrounding roadway environment and land use pattern. If this happens, excessive highway construction cost and huge environmental impact can occur. In this research project, a new vehicle operating speed prediction model was developed which can reflect the effect of surrounding roadway environment into vehicle speed prediction. The followings are the research findings : Firstly, highway terrain types and land use pattern on national roads were classified and integrated into drivers' visual recognition pattern. This was performed using a data management software. Secondly, the developed highway terrain types and land use pattern were related to vehicle speeds and it was found that there were significant statistical differences among vehicle speed for each different terrain and land use pattern. Thirdly. the General Linear Model analysis was employed to analyze the effects of highway geometric features, terrain types, and land use patterns. For two-lane highway and four-lane highway tested in this research project, it was found that R squares were 0.67 and 0.85, respectively. Additionally an optimal highway design speed range table, based on this research project. was proposed for practical use. This table can be reliably used on South Korean national road design, but discretion is required for applying this table to other types of highways including provincial roads and municipal roads.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2014.06a
• /
• pp.211-214
• /
• 2014

본 논문에서는 정보통신미디어계열 학과로서 서울 소재 고등학교 2 학년 학생들을 대상으로 고교-대학 연계 프로그램을 진행한 경험을 분석하였다. 1 차와 2 차로 나누어 진행하였고, 1 차에서는 이론특강과 실습을 통해 최신이론을 학습하고, 기초적인 실습을 하였으며, 2 차에서는 심화실습을 통해 학생들의 문제해결능력과 발전가능성을 가늠해보았다. 1 차에서 학생들은 이론과 실습을 흥미로워 하였으나 난이도에 대한 체감이 달랐고, 2 차에서는 협업하여 결과물을 도출하였고 전체적인 만족도가 높게 나타났다. 결과적으로 직접 하는 실습을 선호하였고, 진로와 전공 탐색에 도움이 되었다고 평가하였으며, 관련 분야로의 학습 의욕이 있음을 나타냈다. 본 경험을 통해 학생들이 이러한 연계프로그램에서 만족하는 것과 원하는 것이 무엇인지를 분석하여 지속적이고 체계적인 고교-대학 연계 프로그램 개발에 도움이 되고자 하는데 의의가 있다.

• Journal of Korean Society of Steel Construction
• /
• v.17 no.2 s.75
• /
• pp.115-130
• /
• 2005

This paper presents the effects of indirect costs on Life-Cycle-Cost(LCC) effective optimum design of steel-box girder bridges. The LCC formulations considered in the LCC optimization of the bridges consist of initial cost and expected rehabilitation costs including repair/replacement costs, loss of contents or fatality and injury losses, and indirect costs such as road user costs and indirect socio-economic losses. To demonstrate the LCC-effectiveness for optimum design of the bridges, an actual steel box girder bridge having two continuous spans(2@50m=100m) is considered as a numerical example. And also, in this paper, various sensitivity analyses are performed to investigate the effects of indirect costs caused by traffic conditions such as number of detour route, number of lane on detour route, length of detour route, and traffic volumes on the LCC-effective optimum design. From the numerical investigations, it may be concluded that indirect costs caused by traffic network may sensitively influence on the LCC-effective optimum design of steel-box girder bridges. Therefore, it may be stated that the traffic conditions should be considered as one of the important items in the LCC-effective optimum design of the bridges.

• Journal of Korean Society of Transportation
• /
• v.22 no.2 s.73
• /
• pp.55-63
• /
• 2004

기존의 설계시간순위 결정은 "순위곡선의 기울기가 완만해지는 지점"이라는 정성적인 기준을 사용하였다. 따라서, 분석자마다 서로 다른 결과를 도출하고 도로 설계시 고려해야하는 두요소(교통혼잡, 경제성)를 전혀 고려하지 못하는 문제점이 있다. 또한 현재의 도로 설계시 대상으로 삼는 시간교통량은 국내 도로의 교통특성이 설, 추석 등의 연휴에 집중적으로 몰리는 등 외국과 그 특성이 상이함에도 불구하고 미국과 동일한 상위 30순위 교통량을 사용한다. 상위 30순위 교통량을 설계시간순위로 하는 경우, 상위 30순위교통량 중 휴일교통량의 비율이 74.1%(설, 추석 연휴 39.7%)로 휴일 집중 교통량의 영향을 크게 받으며, 연중 최대교통량이 용량의 85.2% 에 불과해 도로가 과다 설계된다. 본 연구에서는 목표년도의 연중 최대시간교통량이 용량에 도달하는 순위를 설계시간순위로 하였으며, 분석결과 상위 150순위가 교통혼잡과 도로의 경제성을 모두 고려할 수 있는 설계시간순위로 산정되었다. 설계시간순위를 150순위로 할 경우 현행 설계순위인 30순위에 비해 휴일비율 13.8% 감소, 최대시간교통량의 용량비율($V_1/C_a$) 16.0% 증가의 효과가 있을 것으로 분석되었다. - 현행 설계시간순위(30순위) : 휴일비율 74.1%(설, 추석 비율 39.7%), $V_1/C_a$ 85.2% - 제안 설계시간순위(150순위) : 휴일비율 60.3%(설, 추석비율 23.0%), $V_1/C_a$ 101.2%

• Journal of Korean Society of Transportation
• /
• v.24 no.6 s.92
• /
• pp.33-43
• /
• 2006

This research is to the selection of optimal probability distribution as well as the estimation for design hourly factor in consideration of traffic characteristic, such as road function, lane number and AADT. To accomplish the objectives, we are applied to various probability distribution using traffic data that observed at permanent traffic count points in 2005. The parameters or the selected 14 probability distribution were estimated based on the method of maximum likelihood and the validity condition of the estimated parameter The goodness-of-fit test, such as chi-square test. was performed as well as the estimation of design hourly factor. As a result, An appropriate distributions of each case were selected : Pearson V for two lane of rural roads, LogLogistic for the four lane of rural roads, LogLogistic for the urban roads, Extreme value for recreation roads. And optimal K factor are as following : $0.1{\sim}0.2 $ for two lane of rural roads, $0.09{\sim}0.14$ for the four lane of rural roads. $0.07{\sim}0.13$ for the urban roads, $0.1{\sim}0.2$ for recreation roads.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.2D
• /
• pp.251-258
• /
• 2006

This study is to develop an estimation method of freeway design capacity through the analysis of time headway distribution in continuum flow. Traffic flow-speed diagram and time headway distribution plotted from individual vehicle data shows: a) a road capacity is not deterministic but stochastic, b) time headway distribution for each vehicle speed group follows pearson type V distribution. The freeway design capacity estimation model is developed by determining a minimum time headway for capacity with stochastic method. The estimated capacity values for each design speed are lower when design speed ${\leq}80km/h$, and higher when design speed ${\geq}106km/h$ in comparison with HCM(2000)'s values. In addition, The distinguish difference is that this model leads flexible application in planning level by defining the capacity as stochastic distribution. In detail, this model could prevent a disutility to add a lane for only one excess demand in a road planning level.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.31 no.2D
• /
• pp.209-215
• /
• 2011

Roundabout has circular traffic island in the intersection center and is kind of intersection where the automobile bypass circular traffic island. In Korea, the provisional Roundabouts Design Guidelines were published in 2004 by MLTM (Ministry of Land, Transport and Maritime Affairs). This guideline did not discussed domestic traffic circumstance. It just only introduced foreign instances and their guidelines. In addition, the recent National Competitiveness roundabouts as part of the green growth has been concentrated on the interest. In this paper, 90 degree of the 4-legged roundabout was compared with 72 degree, 45 degree, and 30 degree 5-legged roundabouts by micro simulation VISSIM. As a result of analysis, average travel time is decreased when the inscribed circle diameter become bigger the roundabout. 5-legged roundabout until 2,000 volume per hour evaluated to be similar effect at 90 degree of 4-legged roundabout.

• Proceedings of the KOR-KST Conference
• /
• 1998.10a
• /
• pp.312-322
• /
• 1998

본 논문은 학교 권역의 도로 및 교통요건을 조사하여 어린이 보호구역의 지정 및 관리기준의 적용 실태와 문제점 등을 분서하며, 어린이 보호구역의 조성기준을 적정화하고 체계적인 대책을 수립하는데 목적이 있다. 먼저 어린이 보호구역의 이론적 고찰을 통해 어린이 보호구역이 지정·관리기준 및 외국의 School Zone 사례를 살펴보았다. 현재 어린이 보호구역으로 지정·관리되고 있는 광주시 남구의 14개 초등학교를 대상으로 어린이 보호구역별 도로 및 교통현황과 함께 적용되고 있는 어린이 보호구역의 지정 범위 및 교통규제, 중요안전 시설물의 설치현황 등을 조사하였다. 또 연도주민의 설문을 통해 보행의 안전성과 교통사고의 위험성 등을 조사·분석하였다. 그 결과 12m 이하의 이면도로가 전체대상 통학로의 64.6%에 해당되며, 2차로 이상의 도로는 35.4%로서 이면도로에 접하는 초등학교가 많은 것으로 나타났다. 또 교통규제방안으로 시행되고 잇는 것은 8개 초등학교의 시차별 주차규제와 4개 초등학교의 총 10개의 과속방지턱이 설치되어 있을 뿐이다. 또한 설문을 통해 보행환경의 위험성을 분석한 결과 차량의 속도와 주차차량에 의한 통행 방해나 사고위험을 가장 많이 인식함에 따라 그에 따른 안전시설의 추가 설치가 뒤따라야 하겠다. 이러한 어린이 보호구역에서의 어린이나 보행자의 안전성과 쾌적성을 증진시키기 위해서는 무엇보다도 안전시설의 설치에 따른 유지 및 관리가 중요하다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.21 no.2
• /
• pp.409-415
• /
• 2017

This paper proposes a road segmentation algorithm using a watershed. The proposed algorithm is a segmentation algorithm using an automatic marked watershed that automatically creates a road marker and a background marker using information about vehicles and lanes on road and it can solve problems of a watershed-based segmentation such as overmany regions or handworks for markers. The road marker has property for pure road areas in which lanes are included but vehicles are excluded and the background marker has property for the areas left in which vehicles and background are included. Results of segmentation applied to real road images show that the proposed algorithm can automatically creates appropriate markers and it can properly segments the required road area that include the lane with a vehicle and its both side lanes in various environments, and it is equal to the conventional algorithm using markers created by handwork in performance.

• Journal of the Korea Convergence Society
• /
• v.12 no.2
• /
• pp.201-213
• /
• 2021

Recently, personal mobility has been spreading and using increasing, but the pedestrian environment is getting worse and accidents are also rapidly increasing. Therefore, this study conducts a status survey related to the elements of pedestrian disturbances in personal mobility and identifies the problems. The following measures are presented to improve the pedestrian environment for the mobility handicapped through expert opinion surveys. The movement of individual mobility means in the walking space is prohibited, and the speed limit shall be stipulated to enable the mobility handicapped to walk safely and conveniently. Parking spaces will have to create obstacle zones in the parking area next to the roadway or at the border of sidewalks and roads, and regulations are needed to collect illegally parked vehicles. It is necessary to switch from the existing automobile-oriented road to the road structure considering the use of low and medium-speed vehicles.