• Journal of Korean Society of Transportation
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• v.25 no.2 s.95
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• pp.157-165
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• 2007

In this research, a vertical alignment analysis algorithm was developed. The developed algorithm used acquired data from a vehicle with multiple sensors such as a global positioning system (GPS) an inertial navigation system (INS), and a distance measuring unit (DMI) to collect information about vehicle position and altitude. The vertical alignment analysis algorithm includes the identification of vertical tangent sections, the beginning and ending points of vertical curves, and the calculation of length of vortical curves. Also, the algorithm can help build models for vertical tangent sections and vertical curve sections. In order to verify the algorithm, a field survey was conducted at an actual highway section and the result of the field survey was compared to a highway CAD drawing.

• International Journal of Highway Engineering
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• v.14 no.1
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• pp.95-102
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• 2012

This study has been conducted to characterize the relations between the accident rate and the overlap section elements where the horizontal alignment and vertical alignment are overlapped. The researches were performed on Horizontal curve sections of 4-lane highways with 100km/h of design speed and speed limit. Korea Highway Corporation's Geographic Figurative Information System was adopted for geometric organization and Highway Traffic Accident Statistics was used. The results reveal that sections made of a single slope without vertical curve has greater accident rate than those with vertical curve, and that sections with 1 vertical curve are higher in the accident rate than those with over 2 vertical curve. For the sections with 1 vertical curve, SAG sections are higher than CREST sections and for the previous straight section of horizontal curve are higher than curved ones. In particular, when the road surface is wet, the accident rate is closely related with SAG vertical curves or leftward horizontal curved sections. This study will have meanings that it proposes the importance of design of road alignment by taking consideration of 3D synthetic alignment conditions for improvement of the road safety.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.2033-2040
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• 2013

There have been noticeable developments for the optimization of the highway and railroad alignments with the IT and computerized tools. The designers expect that all of the quantitative design elements should be considered. This study developed a methodology which can be useful for the vertical alignment design. It provides a accurate "vertical control point" searching method, and makes the vertical alignment optimization more efficiently. The vector method makes the searching faster and calculates more accurate application sections. The results from this method generate more reliable vertical alignments than the conventional raster method for less computation time.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.4
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• pp.325-333
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• 2000

This paper deals with real time building of route and vertical alignment information system for the efficient and scientific management using GSIS. First, we redesigned route and vertical alignment for obtained basic data using road projector(road design main software). Using by these acquired result, we made a database on road plan and vertical alignment drawing as a basic information being used to construction of road complex information system. The main objectives in this study are the rational maintenance road planing for drawings, its database and the systematization of route information management through the fast updating, mending, supplement. Result of this study enables us to manage route information.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.407-412
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• 2005

본 연구에서는 노선선정 시 요구되고 있는 방대한 자료와 결정요소 등을 선택하여 의사결정체계인 계층분석과정을 이용하여 합리적인 노선선정의 방법을 제시하고 이를 평가하고자 하며, 이렇게 수행된 노선선정 결과를 지혈공간정보체계를 이용하여 시각화 및 분석하고자 한다. 구체적인 적용방법은 계층분석과정으로 선정된 평면선형을 분석하고 그것을 기반으로 종단선형의 설계를 종단경사 변화에 의한 다각적인 방법으로 분석하여 합리적인 노선선정을 도출하여 평가하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.3D
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• pp.289-294
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• 2010

It is well known that rumble strips contribute to reduce traffic accidents. The present paper provides the reduction effect of traffic accidents under specific highway geometrics after rumble strip installation. Traffic accidents on freeway sections before and after rumble strip installation are compared when conditions of the highway geometric characteristics such as horizontal, vertical geometrics are given. It is shown that rumble strips are effective under highway geometric conditions of down slopes or right curvatures. It is also shown that rumble strips are still effective with shorter length of installation.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.232-235
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• 2006

일반적으로 선형 토폴로지 (chain topology) 무선메쉬네트워크의 종단간 최대 전송률은 경쟁관계 그래프 (contention graph)에 기반하여 트래픽 병목 구간의 노드 개수와 1 홉 링크의 평균 전송률을 결정하여 계산하는 방식이 널리 이용된다. 본 논문은 평균을 이용한 방법은 IEEE 802.11 DCF (Distributed Coordination Function)를 MAC 프로토콜로서 사용하는 무선메쉬네트워크에서 정확성에 한계가 있음을 보이며, 이와 같은 정확성의 한계를 유도하는 인자로서 전송률의 편차를 소개한다. 또한 전송률 편차를 고려하여, 단일 선형 토폴로지에서 종단간 최대 전송률을 구하는 방법을 ns2 시뮬레이션을 통해 검증한다.

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

• International Journal of Highway Engineering
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• v.10 no.1
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• pp.1-9
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• 2008

Five bases for of highways are sight distance, vehicle stability, driver comfort, drainage and aesthetics. Among these bases, the sight distance is the most critical one in the highway alignment design. It is certain that highways and drivers' observation actions are 3-dimensional in nature. But, the highway alignment design and the sight distance analysis have been performed on 2-dimensional planes because of various constraints and complexity of calculating 3-dimensional sight distance. The purpose of this study is to derive a model for determining exact available sight distance in 3-D combined horizontal and vertical alignments. Application of the model is illustrated using numerical examples. The proposed model should be useful in quantifying the criteria for 3-D highway alignments.

• Journal of the Korea Convergence Society
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• v.10 no.2
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• pp.217-225
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• 2019

The Latent Growth Modeling(LGM) is known as the typical analysis method of longitudinal data and it could be classified into unconditional model and conditional model. It is common to assume that the growth trajectory of unconditional model of LGM is linear. In the case of quasi-linear, the methodology for improving the model fitness using Sequential Pattern of Association Rule Mining is suggested. To do this, we divide longitudinal data into quintiles and extract periodic changes of the longitudinal data in each quintiles and make sequential pattern based on this periodic changes. To evaluate the effectiveness, the LGM module in SPSS AMOS was used and the dataset of the Youth Panel from 2001 to 2006 of Korea Employment Information Service. Our methodology was able to increase the fitness of the model compared to the simple linear growth trajectory.