• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2007년도 가을 학술발표논문집 Vol.34 No.2 (A)
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• pp.229-230
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• 2007

Lane detection is one of the major components of traffic intelligence. It is impossible to recognize lanes as human do in all kinds of special situations; however, we can try to solve special problems with special methods. In this paper we propose a simple method using color segmentation, the Probabilistic Hough Transform (PHT), and the Least-Square in real-time lane tracking. Vehicles in neighborhood can be eliminated with one simple threshold in segmentation. Meanwhile, broken shape lanes in different road conditions can be successfully detected using the combination of PHT and Least-Square method. Eventually, this method is tested with groups of static images downloaded from internet and video sequences shot randomly on some highways. Satisfactory results are received.

• 한국도로학회논문집
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• 제19권1호
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• pp.81-90
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• 2017

PURPOSES : The goal of this study is to analyze the operational efficiencies of special roundabouts using simulated programs. METHODS : This study primarily focuses on comparing the delays and traffic flow disturbances occurring at special roundabouts. In this study, the operational efficiencies of 450 scenarios (5 roundabout types ${\times}$ traffic volumes ${\times}$ directional ratios ${\times}$ measures) are analyzed according to the corresponding delays and traffic flow disturbances using VISSIM and SSAM. RESULTS : The main results are as follows: 1) the Hamburger roundabouts are determined to yield the least common-type delays, 2) the amount of delays at Turbo and Flower roundabouts with respect to relatively increased right-turn-type delays, in addition to the amount of delays at the Left-turn slip-lane roundabout with respect to relatively increased left-turn-type delays, are found to be reduced as compared to the common-type delays. Lastly, common- and increased right-turn-type traffic flow disturbances at the Turbo roundabout and increased left-turn-type traffic flow disturbances at the Left-turn slip-lane roundabout are determined to be the most infrequent. CONCLUSIONS : This study comparatively analyzes five roundabout types: standard, Flower, Turbo, Hamburger, and Left-turn slip-lane. The effectiveness of roundabouts can increase according to given traffic volume, directional ratio, and measure of effectiveness.

• 한국ITS학회:학술대회논문집
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• 한국ITS학회 2008년도 제7회 추계학술대회 및 정기총회
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• pp.309-310
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• 2008

• 한국응급구조학회지
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• 제4권1호
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• pp.63-71
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• 2000

Exceptive clause of ambulance stated in Road Traffic Laws of ambulance car accidents is not properly applied and emergency staffs who transfer over 85% of emergency cases are to be forced to start out to the emergency field with unstable conditions which they may be punished on the criminal and civil laws. Hereby this study makes the following suggestions to activate the duties of transferring emergency cases by emergency staffs, promote their morale and diminish the victim of emergency staffs due to traffic accidents. 1) It is prescribed that ambulance car drivers should be protected legally by applying the exceptive clauses thoroughly regulated in special case clauses because ambulance cars are used for the purpose of saving the human life. 2) On the traffic accidents occurred during the transfer of emergency cases, the special insurance system is created for treating the ambulance car accidents, not to bind the emergency staff's mistake to traffic law and the victims are compensated by the nation on the basis of insurance system and emergency staffs have the systematic security. 3) On the road over six lanes, emergency lane is set on the center and ambulance car should be used as the exclusive lane. 4) Ambulance car drivers must have the habit of transferring emergency cases rapidly within the range of legal operation.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제26권4호
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• pp.185-223
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• 2022

The classical equation of Jonathan Homer Lane and Robert Emden, a nonlinear second-order ordinary differential equation, models the isothermal spherical clouded gases under the influence of the mutual attractive interaction between the gases' molecules. In this paper, the Adomian decomposition method (ADM) is presented to obtain highly accurate and reliable analytical solutions of a class of generalised Lane-Emden equations with strong nonlinearities. The nonlinear term f(y(x)) of the proposed problem is given by the integer powers of a continuous real-valued function h(y(x)), that is, f(y(x)) = h^m(y(x)), for integer m ≥ 0, real x > 0. In the end, numerical comparisons are presented between the analytical results obtained using the ADM and numerical solutions using the eighth-order nested second derivative two-step Runge-Kutta method (NSDTSRKM) to illustrate the reliability, accuracy, effectiveness and convenience of the proposed methods. The special cases h(y) = sin y(x), cos y(x); h(y) = sinh y(x), cosh y(x) are considered explicitly using both methods. Interestingly, in each of these methods, a unified result is presented for an integer power of any continuous real-valued function - compared with the case by case computations for the nonlinear functions f(y). The results presented in this paper are a generalisation of several published results. Several examples are given to illustrate the proposed methods. Tables of expansion coefficients of the series solutions of some special Lane-Emden type equations are presented. Comparisons of the two results indicate that both methods are reliably and accurately efficient in solving a class of singular strongly nonlinear ordinary differential equations.

• 대한교통학회지
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• 제19권5호
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• pp.85-97
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• 2001

최근 급격히 증가하고 있는 교통수요에 능동적으로 대처해 나가기 위해서는 도시 가로망이 도시교통환경에서 담당하는 교통기능을 체계적으로 분석하여 도로의 기능적 위계를 이루고, 제약된 예산 하에 최대의 효율을 누릴 수 있는 교통관리계획이나 시설계획을 수립해야 할 것이다. 그러나 기능적 위계의 설정 지표 중 중요도가 높은 차량의 운행경로는 조사상 불가능하거나 큰 어려움을 내포하고 있다. 이러한 문제점을 해결하기 위해 본 논문에서는 Simulation기법을 이용하여 차량의 운행경로 및 운행거리를 파악하였다. 이에 본 연구는 특정 경로에 유출입하는 교통량을 알 수 있는 경로OD교통량과 특정 경로내의 특정 노드(i, j)사이에 통과하는 경로교통량이라는 개념을 도입하였다. 이러한 통행량들을 분석하여 도시 가로망의 기능적 분류를 가능케 하는 정량적 지표를 정립하였으며, 더 나아가 효율적 투자계획 및 정책결정권자의 계획방향 판단에 일조할 수 있는 '집중관리구간' 선정영역을 제시하였다.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제14권6호
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• pp.619-623
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• 2008

차선검출시스템은 지능형 차량 시스템의 중요한 요소이다. 차선검출 시, 주변 환경과 날씨의 변화 때문에 차선검출은 다양한 어려움에 직면하게 된다. 본 논문에서는 차선검출 및 추적을 위해 다양한 환경에서도 안정적으로 동작하는 간단하면서 효율적인 방법을 제안한다. 제안된 방법에서는 차선을 추적하고 차선의 기울기를 수정하기 위해 확률적 허프 변환(Probabilistic Hough Transform, PHT)과 최소자승법(Least-square method, LSM)를 이용한다. 일반적으로 차량의 내부에 설치된 카메라로부터 획득된 영상은 영상의 하단부분에서 차선이 비교적 뚜렷이 나타나고, 주변의 간섭을 적게 받는다는 가정 하에 제안된 방법에서는 차선검출 및 추적의 효율성을 증대시키기 위해 영상의 하단부분에 관심의 대상이 되는 두 개의 영역을 설정한다. 제안된 방법의 효율성을 입증하기 위해 정지영상과 비디오영상을 사용하여 실험하였고, 실험결과 제안된 방법이 강건하고, 신뢰성있는 결과를 얻었음을 보였다.

• 대한교통학회지
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• 제4권1호
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• pp.3-11
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• 1986

One important element of a systematic approach to the management and control of the flow of people over an urban street network is the monitoring and evaluation of system performance. The nature of TSM strategies that, in part, differentiates them from traditional long-range transportation improvement alternatives is that they are less costly, are more quickly implemented and modified, and are often oriented toward sub-area problems which must be addressed at a more microscopic level of analysis. These factors suggest that pre-implementation evaluations of alternative TSM actions will often have to rely on quick-turn around, manual methods of analysis to guide the choice of which management action should be implemented. This paper was prepared to focus on the definition and importance of TSM, specifically associated with monitoring and evaluating traffic performance in the context of TSM startegies. A simple case study of reversible lane technique was presented. The purposes of the case study is to illustrate the methodology of evaluating TSM strategies and demonstrate to identify the benefit from the reversible lane technique, which may otherwise be overlooked in real world. Applying the reversible lane technique to Sam-Il elevate highway, it was found to be a very promising low cost alternative to reduce total travel time(or delay) and fuel consumption.

• 대한안전경영과학회지
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• 제20권2호
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• pp.1-8
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• 2018

This study aims to provide a real-time information to the driver by effectively operating the advanced safety device attached to the freight vehicle, thereby minimizing insecure behavior of the driver such as speeding, rapid acceleration, sudden braking, And improve driving habits to prevent accidents and save energy. Advanced safety equipment is a device that warns the driver that the vehicle leaves the driving lane regardless of the intention of the driver and reduces the risk of traffic accidents by mitigating or avoiding collision by detecting a frontal collision during driving.The main contents of this report are as follows: In case of installing a warning device on a lane departing vehicle (excluding a light vehicle) and a lorry or special vehicle with a total weight exceeding 3.5 tonnes, the driver must continue to operate unless the driver releases the function.In addition, when the automatic emergency braking system is installed, the structure should be such that the braking device is operated automatically after warning the driver when the risk of collision with the running or stopped vehicle in the same direction is detected in front of the driving lane.

• 한국조경학회지
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• 제27권5호
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• pp.1-11
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• 2000

The aim of this study is to suggest guidelines of bicycle lanes in terms of landscape architecture with special reference to Kyongju. The research is mainly based on landscape satisfaction factors analysis regarding 16 variables and 10 slide photos of bicycles lanes. The 43 students of Landscape Department in Kyungpook National University were selected for the research. The major research findings are as follows; 1. Satisfaction degree of 16 variables are assessed in terms of semantic differential scale. The assess group is generally satisfied with variables concerning bicycle lane environment such as $\ulcorner$inclination of the lane (5.2)$\lrcorner$and $\ulcorner$road pavement conditions (5.1)$\lrcorner$. But the group expresses rather low satisfaction degree on the variables related lanes' surrounding landscape such as $\ulcorner$visual variety (3.9)$\lrcorner$, spacious resting place (3.7)$\lrcorner$ and $\ulcorner$variety of facilities (3.1)$\lrcorner$. 2. The level of satisfaction degree regarding 16 variables and 10 photos shows that the male gives relatively higher satisfaction degree than the female group. But there is no statistical significance between the group regarding satisfaction degree of each variable and photo except 4 variables and 2 photos. 3. The assess group gives the highest satisfaction degree on the$\ulcorner$no. 10 slide (6.5)$\lrcorner$ and the lowest on the $\ulcorner$no. 7 slide (2.7)$\lrcorner$. The two photo shows variables of more than 4 points difference of satisfaction degree, such as $\ulcorner$good looking planting threes (4.8)$\lrcorner$, $\ulcorner$enough shadows (4.8)$\lrcorner$ and $\ulcorner$comfortable atmosphere(4.1)$\lrcorner$. 4. $\ulcorner$Aesthetic and amenity factor$\lrcorner$, $\ulcorner$use condition factors$\lrcorner$, $\ulcorner$ike lane environment factors$\lrcorner$, and $\ulcorner$inclination and open view factors$\lrcorner$are the main four factors influencing landscape satisfaction of bicycle lane. Regression model using factor scores for landscape satisfaction degree of bike lane is S(Satisfaction degree)=4.526+1.099(aesthetic and amenity factor)+0.720(use condition factors)+0.486(bike lane environment factors)+0.048(inclination and open view factors($R^2$=0.811).