• 한국도로학회논문집
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• 제19권6호
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• pp.165-173
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• 2017

PURPOSES : The current practice in car headlight visibility performance evaluation is based on the luminous intensity and illuminance of headlight. Such practice can be inappropriate from a visibility point of view where visibility indicates abilities to perceive an object ahead on the road. This study aimed at evaluating the appropriateness of current headlight evaluation method. METHODS : This study measured the luminance of object and road surface at unlit roadways. The variables were measured by vehicle type and by headlight lamp type. Based on the measurements, the distance where drivers can perceive an object ahead was calculated and then compared against such distance obtained by conventional visibility performance evaluation. RESULTS : The evaluation method based on illuminance of headlight is not appropriate when viewed from the visibility concept that is based on object-perceivable distance. Further, the results indicated a shorter object-perceiving distance even when road surface luminance is higher, thereby suggesting that illuminance of headlight and luminance of road surface are not the representative indices of nighttime visibility. CONCLUSIONS : Considering that this study utilized limited vehicle types and that road surface (background) luminance can vary depending on the characteristics of the given road surface, it would likely go too far to argue that this study's visibility performance evaluation results can get generalized to other conditions. Regardless, there is little doubt that the current performance evaluation criterion which is based on illuminance, is unreasonable. There should be future endeavors on the current subject which will need to explore study conditions further, under which more experiments should be conducted and effective methodologies developed for evaluating automotive headlight visibility performance. Needs are recognized particularly in the development of headlight visibility performance evaluation methodology which will take into account road surface (background) luminance and luminance contrast from various perspectives as the former indicates the driver's perception of the front road alignment and the latter being indicative of object perception performance.

• 한국측량학회지
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• 제39권5호
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• pp.343-349
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• 2021

In The process from design to construction in the existing construction work was less efficient due to the contradictory approach of identifying the 3D state in the plan view and the repeated generation of surveys, floor plans, drawings. Accurate 3D design data is essential for smart construction. However, most of the existing related studies have focused on explaining the development method and main functions of equipment or improving the productivity of smart construction. Therefore, in this study, the utility of 3D design model generation for smart construction and construction survey using 3D laser scanner was evaluated. Plane and vertical road alignment were created using the specifications of the road. The generated road alignment was created as a three-dimensional corridor design using cross-sections at intervals of 20m. In addition, it was possible to create a DTM (Digital Terrain Model) using a digital map and effectively create a 3D design model for the study area through overlapping. Construction survey using a 3D laser scanner showed accuracy within 10cm as a result of the accuracy evaluation. These results proved that construction surveying using a 3D laser scanner is possible because it satisfies the acceptable accuracy of the relevant regulations modeling of target areas using 3D design and construction survey using 3D laser scanner can be a way to address shortcomings of existing GNSS (Global Navigation Satellite System) methods. And accurate 3D data will be used as essential data as basic data for smart construction.

• 대한공간정보학회지
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• 제11권2호
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• pp.39-45
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• 2003

도로는 인류와 더불어 발전하여 근대화 되어왔고, 생산과 유통 등 경제적으로나 정치적 문화적으로도 중요한 기능을 하고 있으며, 교통체계 중에서 특히 우리의 생활에 중요한 교통시설이다. 그러나, 건설위주의 국가정책으로 인해 도로 시설물 관리가 과학적이고 체계적으로 수행되지 못하고, 기존 도로의 설계도가 훼손 분실되어 도로의 유지관리 차원에서 어려운 점이 많다. 이러한 경우, 기존의 측량방식으로 도로의 선형을 재현하기란 상당한 기간이 소요되며, 교통의 통제 등 많은 어려움이 따른다. 또한 도로 중심선의 3차원 좌표를 신속히 추출하기 위하여 위성측량방법을 이용할 경우, 터널과 같은 지역에서는 가시위성의 확보가 어려워서 관측이 되지 않는다. 따라서, 본 연구에서는 DGPS(Differential GPS)방법을 이용하여, 도로의 중심선 3차원 위치자료를 취득함과 동시에, 이러한 자료를 바탕으로 자료 취득이 불가능한 터널 내에서의 평면선형을 추출하고, 기존 설계도의 선형과 비교함으로써, 도로선형자료의 갱신과 유지관리 차원에서 앞으로 도로관리통합시스템을 구축하는데 있어서 도로선형 및 도로시설물의 위치를 효과적으로 관리 이용하는데 기여하고자 한다.

• 한국인터넷방송통신학회논문지
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• 제14권4호
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• pp.165-172
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• 2014

자동차가 도로를 주행하는데 있어, 도로설계기준에 미흡한 노면의 상태와 도로환경은 운전자에게 큰 영향을 미친다. 특히, 과거에는 도로설계를 경험적이고 관념적인 판단으로 설계하고 수행하였으나, 최근에는 3, 4차원의 요소들을 동시에 검토하고 조정하는 새로운 기술개발이 시도되고 있다. 본 연구에서는 교통사고 재현을 위한 PC-crash 프로그램을 이용하여 빙판도로의 최고점에서 제동시 주행속도와 종단경사 변화에 따른 차량의 거동특성을 분석하였다. 그 결과로, 교차로 종단경사에 대한 차량거동특성에 노면상태에 따른 마찰계수와 차량속도가 영향을 미친다는 사실을 확인하였으며, 도로설계에 대한 문제점을 사전에 해결하기 위한 시뮬레이션을 통하여 검증의 적합성을 보여주었다.

• 한국도로학회논문집
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• 제16권5호
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• pp.173-182
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• 2014

PURPOSES : The purpose of the study is to a) explore the operating speed of trucks on rural highways affected by road geometry, and thereby b) develop a predictive model for the operating speed of trucks on rural highways. METHODS : Considering that most of the existing studies have focused on cars, the current study aimed to predict the operating speed of trucks by conducting linear regression analysis on the speed data of trucks operating on the linear-curved-linear portions of the road as a single set. RESULTS : The operating speed in the plane curve portion increased with the length of the curve, and decreased with a lower vertical grade and a smaller curve radius. In the straight plane portion, the operating speed increased with a larger curve radius(upstream), and decreased with an increase in the change of the vertical grade, depending on the length of the vertical curve. CONCLUSIONS : This study developed estimation models of truck for operational speed and evaluated the degree of safety for horizontal and vertical alignments simultaneous. In order to represent whole area of the rural highway, the models should be ew-analyzed with vast data related with road alignment factor in the near future.

• Tribology and Lubricants
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• 제23권5호
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• pp.228-233
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• 2007

This paper presents the case studies on the friction related wears of an automotive tire, which is strongly connected to the safety and comfort of a driver during a running of a car. Wear scars of a tire tread are affected by various causes such as an air pressure, a wheel alignment, a driving speed, road conditions, starting and braking habits of a driver. The data were collected from used tires for a replacement at the car service center. Most of the wear problems came from the improper repair and adjustment of revolving components, which cause an unbalanced wear of a tread part of a tire. Thus, the regular checking of a tire radically reduces the wear scars of a tire and may increase a driving safety and a fuel economy of a car and a wear life of a tire.

• 한국도로학회논문집
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• 제13권1호
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• pp.129-138
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• 2011

본 연구에서는 노선선정과정에서 정량적으로 환경성을 평가할 수 있는 방법에 대한 각종 제도 및 문헌을 고찰해 보고, 이를 바탕으로 도로노선의 정량적 환경성 평가 방법을 제안하였으며 이를 국내에 계획된 도로노선에 적용하여, 국내도로에 대한 친환경성을 평가하였다. 이에 따라 중부권, 강원권, 남부권의 지역별 사례구간을 선정하고 제안된 환경성 평가방법을 수행하였다. 그 결과 각 지역별 사례구간의 해당 지역에 대한 환경점수대의 분포가 다양하게 나타남을 확인하였다. 또한 각 노선의 환경적인 정도를 나타낼 수 있도록 해당지역의 환경영향 최소화 경로를 생성한 후 이를 기준으로 각 노선의 친환경도를 분석하였다. 그 결과 지역의 환경적 민감도가 큰 지역 즉, 높은 점수대가 많은 지역인 강원권에 설계된 노선의 친환경도가 가장 낮게 분석된 결과를 볼 수 있었다.

• 대한교통학회지
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• 제24권7호
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• pp.41-51
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• 2006

본 논문에서는 고속도로 트럼펫 IC형식의 연결로 선형조건 및 교통조건에 따른 교통사고특성에 관한 기초연구를 수행하였다. 교통사고 특성분석은 트럼펫 IC형식의 유입 및 유출 연결로 형태의 도로선형조건 및 교통조건에 따른 다양한 거시적 미시적 교통사고분석을 수행함으로써 연결로의 형태(직결, 준직결, 루프 연결로) 별로 도로선형조건(곡선반경, 곡률차, 본선 구배)과 교통조건(교통량)이 교통사고에 미치는 영향을 규명하였다. 거시적으로 사고율은 트럼펫 IC A형과 B형이 거의 유사하게 나타났으나, 사고건수는 B형이 A형보다 약 1.5배 높게 나타났다. 그리고 유출연결로의 사고율은 유입연결로보다 약3배 이상 높게 나타났다. 거시적으로 유출연결로의 사고율은 교통량, 곡률차, 첫 번째 곡선반경의 증가에 따라 지수형으로 감소하였다. 그러나 사고율과 두 번째 곡선반경의 관계는 ${\cap}$형의 관계를 보였으며, 본선구배에 따른 사고율은 본선구내 $-0.15{\sim}-0.5%$에서 높게 나타났다. 고속도로 트럼펫 IC형식 연결로의 교통사고 특성분석 결과는 비용-효율적인 트럼펫 IC 연결로의 설계를 위한 평가의 수단으로 이용될 수 있을 뿐만 아니라, 사고취약 고속도로 연결로에 대한 개선 대안의 수립에도 기여할 것으로 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1304-1306
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• 2004

Recently, the study for development of system having affinity for environment is on investigation. This issue is also applicable to transportation system. This paper suggested the inductive power transformer used for the road/railway applied to contactless power transfer system. The two secondary windings, large gaped magnetic structure and horizontal alignment between primary and secondary coil for that transformer approach a process for improvement of contactless power transfer system performance.

• 대한교통학회:학술대회논문집
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• 대한교통학회 1998년도 Proceedings The 4th International Transport Symposium
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• pp.141-151
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• 1998

Provision of Passing Sight Distance (PSD) is an important component in two-lane highway design and has a critical impact on capacity of highway and safety of drivers. Many models have been developed to estimate PSD reasonably. However, each of them has a number of shortcomings for reflecting the real traffic conditions. This paper introduces a revised model that reflects the characteristics of the passing maneuver. The changes in passing sight distances under different assumptions about acceleration and vehicle length, which are related to vehicle types, are presented. The results obtained by the revised model are compared with those obtained from the existing models. There is an important link between geometric design decisions which determine the available sight distance and the quality of service which the road provides. In this paper, we examine one aspect of this relationship. That is to determine whether the passing sight distance is provided by improving horizontal alignment for a specific roadway section or passing may be restricted to save the road construction cost. To do so, a simple method for estimating traffic delay in no-passing is introduced.