• 한국건설관리학회논문집
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• 제16권4호
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• pp.129-138
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• 2015

본 연구에서는 건설산업에 있어서 파급효과가 높은 도로시설물을 선정하여, 세부적인 기술수준 분석을 실시하고, 향후 해외 진출을 위한 중점추진분야를 도출하였다. 분석결과, 한국의 도로시설물에 대한 기술수준은 도로 운영 및 관리기술 부문에 대한 기술수준이 높은 반면, 도로포장기술 부문은 상대적으로 낮은 기술수준을 보유한 것으로 나타났다. 그리고 본 연구에서는 경제적, 사회적, 기술적 중요도를 분석하여 투자효율이 높을 것으로 판단되는 중점 추진 분야를 도출하였으며, 도출된 항목으로는 "무보수 모듈러 도로포장 기술"과 "도시 온도저감형 도로 기술"로 나타났다.

• Elastomers and Composites
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• 제57권3호
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• pp.92-99
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• 2022

A large amount of particles on the roads is produced by friction between the vehicles and the road surface and by inflow from outside. The type of these particles affects the abrasion behavior of tire tread. In this study, road dust collected at a bus stop was separated by size, and the particles with sizes of 106-212 mm were analyzed. The particles were separated by density using NaI and NaBr aqueous solutions with densities in the range of 1.10-1.80 g/cm³ with the 0.10 g/cm³ interval. In the road dust sample, the following particle types were found: tire-road wear particles (TRWPs), asphalt pavement wear particles (APWPs), plant-related particles (PRPs), road paint wear particles (RPWPs), and plastic particles (PPs). The densities of TRWPs, APWPs, PRPs, and RPWPs were 1.20-1.80, >1.60, >1.10, and >1.40 g/cm³, respectively, while PPs were found in all density ranges. Additionally, many small mineral particles were observed on the particles. Order of the relative content of the particles was PRP > TRWP > APWP ~ RPWP > PP. APWPs that were stuck to TRWP could be removed by chloroform treatment. The shapes of the particles were characterized using their magnified images.

• Environmental Engineering Research
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• 제20권4호
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• pp.383-391
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• 2015

Transparent type noise barrier is a desirable facility since it provides a secure view to drivers and passengers. However, reflection from this type of barrier could annoy dwellers on the sides of the road. To reduce reflection noise by transparent type barrier, modification can be made to the shapes on the front side and hence get effects by distortion of sound transmission. To achieve this, we have conducted simulation by which the effects of patterned screens of noise barrier on high-ways were investigated. The reduction effects of reflected sounds were evaluated for swelling, swelling with curved, rectangular and V-shaped screen type barriers, compared to the planar panel. The emitting noise was generated by 6-lane road and the patterned noise barriers had shown the reduction effects, especially in swelling and swelling with curved type for middle height dwellers, and the V-shaped screen type for higher elevation dweller. The swelling-type showed a decrease of 0.7~1.2 dB, performing the best diminution effect among the tested noise barriers.

• 대한교통학회지
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• 제23권6호
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• pp.7-18
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• 2005

현재 우리나라의 설계속도는 도로의 기능, 지역특성, 지형에 의해 결정하도록 규정하고 있다. 그러나 도로의 기능을 구분하는 뚜렷한 기준이 없어 적정 설계속도 결정에 설계자의 주관이 개입될 여지가 많으며, 기능분류가 단순하여 설계에 반영되지 못하는 도로기능이 존재하고, 지역분류기준 또한 모호하여 주변지역의 토지이용 특성을 제대로 반영하지 못하였다. 한편 도로가 통과하는 지역의 지형적 특성을 충분히 고려치 않고 단순히 교통소통 만을 강조하여 지나치게 높은 설계속도로 설계하여 도로의 건설비가 증가하고 있다. 따라서 본 연구에서는 지방부 도로 기능분류 및 설계속도 결정에 계획교통량 규모를 반영토록 하여 설계자의 주관적 판단소지를 줄이고 경제적 효율성을 기하였으며, 도시부 기능을 세분화하여 기능분류의 단순함과 설계에 반영되지 못하는 도로의 기능이 존재하는 문제를 해결하였다. 또한 GIS의 지형고도 데이터를 이용하여 지형을 구분하는 구체적 기준을 제시하였다. 즉 기능, 지역, 지형요소를 보다 세분하여 고려하고, 보완기준으로 계획교통량을 추가한 새로운 기능분류와 설계속도 결정기준을 제시하였다.

• Structural Engineering and Mechanics
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• 제11권3호
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• pp.259-272
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• 2001

The impact behavior of a multigirder concrete bridge under single and multiple moving vehicles is studied based on correlated road surface characteristics. The bridge structure is modeled as grillage beam system. A 3D nonlinear vehicle model with eleven degrees of freedom is utilized according to the HS20-44 truck design loading in the American Association of State Highway and Transportation Officials (AASHTO) specifications. A triangle correlation model is introduced to generate four classes of longitudinal road surface roughness as multi-correlated random processes along deck transverse direction. On the basis of a correlation length of approximately half the bridge width, the upper limits of impact factors obtained under confidence level of 95 percent and side-by-side three-truck loading provide probability-based evidence for the evaluation of AASHTO specifications. The analytical results indicate that a better transverse correlation among road surface roughness generally leads to slightly higher impact factors. Suggestions are made for the routine maintenance of this type of highway bridges.

• 융복합기술연구소 논문집
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• 제4권2호
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• pp.67-70
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• 2014

Recently EU has been recognized that there is a difference of emission quantity between emission certification test mode and real-road driving test. Accordingly the European Commission is currently preparing to require real-road testing as part of the passenger car type-approval process in the EU. vehicle manufacturers from 2017 are expected to test new vehicles not only under laboratory conditions but also on the real-road, using PEMS equipment. Therefore the purpose of this study is to analyze the emission and Fuel Economy of CVS-75 mode test using chassis dynamometer and RDE test using PEMS equipment by PHEV passenger car.

• 한국정보처리학회논문지
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• 제7권8호
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• pp.2575-2586
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• 2000

본 논문에서는 지도영상의 도로정보를 자동으로 추출할 수 있는 알고리즘을 제안한다. 제안된 알고리즘은 복잡한 지도영상에서 도로영상만을 추출한다. 추출된 영상은 세선화 방법에 의해 도로의 골격만으로 이루어진 영상으로 변환된다. 세선화된 영상은 여러 종류의 문제점을 포함한다. 이러한 문제점을 보정하기 위해 도로의 특성을 나타내는 Rutovitz 연결수에 의해 분류된 후 도로특성에 따라 개별적인 보정이 이루어진다. 여러 가지 지도영상에 대한 실험결과를 통해 제안한 방법의 유효성을 입증하였다.

• 한국환경과학회지
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• 제21권4호
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• pp.391-399
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• 2012

This study proposes lighting simulation approach to assess lighting quality on motor ways and walk ways considering each type of form and growth of roadside trees. Simulation approach to assess quality of lighting is frequently used for lighting design which guarantees secure of drivers and pedestrians during the night time. But, road side trees which have diverse benefits for citizens acts on obstacles during night time needs lighting. The results of this study shows a possible way for tuning the aims of both lighting and road side tree. It will be possible to develop harmonic design standards for road way lighting if further study achieved based on the result of this study.

• International Journal of Safety
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• 제7권1호
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• pp.26-29
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• 2008

The purpose of this study is the measurement of whole-body vibration for different road surfaces. Experimental measurements were taken on asphalt, cement, and off-road surfaces as defined by ISO 2631-1. Each experiment was conducted under the same set of conditions (measurement duration, times, speed, vehicle type). Measurement duration was 10 minutes and 3 separate measurements were taken on each road surface. Vehicle speed was 60km/h. In accordance with ISO 2631-1, an acceleration sensor is set up between the driver's seat and the human body. For evaluation, RMS(root-mean-square) values were taken as suggested by ISO 2631-1. The results suggest "health guidance caution zones", and the evaluation was based on obtaining the vector sum with "health guidance caution zones".

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.600-604
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• 2013

A CTBA(Coupled Torsion Beam Axle) is a general type for rear suspension of small/compact sedans. It connects left and right knuckles using torsion beam axle and trails rear wheels. Therefore, a CTBA performs a main role of ride & handing. But, a CTBA suspension has main bending mode around 120Hz and causes road booming noise in the interior of a car. Therefore, the mode control of a CTBA is very important for reducing road noise. In this paper, we optimized the shape of a CTBA to reduce road noise considering R&H performance, simultaneously. The vibration mechanism of CTBA was investigated using ODS(Operational Deflection Shape) and mode shape.