Korea Expressway Corporation

Hwaseong, South Korea

Korea Expressway Corporation

Hwaseong, South Korea
SEARCH FILTERS
Time filter
Source Type

Falchetto A.C.,TU Braunschweig | Moon K.H.,Korea Expressway Corporation
Journal of Materials in Civil Engineering | Year: 2017

In this research, a simplified approach based on size effect theory is used to extrapolate the strength values obtained on small asphalt mixtures specimens at low temperature with a modified bending beam rheometer (BBR). First, nine asphalt mixtures having different mix designs are prepared. Then, Weibull statistics and factorial design are used to evaluate the statistical distribution of the BBR measurements and the effect of conditioning time, loading rate, and testing temperature on material response, respectively. Finally, the BBR strength measured at three different temperatures is compared to the corresponding values obtained from two conventional test methods: direct tension (DT) and indirect tension (IDT) tests. It is observed that BBR strength values are statistically equivalent to those of IDT and DT when the size effect theory and the weakest link model are used to take into account the difference in volume, geometry, and stress field across the three testing methods. © 2016 American Society of Civil Engineers.


Seo Y.,Korea Expressway Corporation | Kim S.-M.,Kyung Hee University
Renewable and Sustainable Energy Reviews | Year: 2013

The first attempt has been made in Korea to quantify the carbon dioxide (CO2) emitted from the consumption of main and basic materials for road, bridge and tunnel constructions. These materials-induced CO2 emissions were estimate using the amount of materials consumed and corresponding CO2 emission factors. A simple linear relation was developed between unit price and emission factor for some of basic materials whose emission factors were not available. To demonstrate overall and unit emissions, twelve expressway sections constructed between 2006 and 2007 have been selected and consumed materials have been identified. The unit emissions were then utilized to estimate the total emissions that might have been released from all types of roads (expressways, national highways and local roads) up to the year 2007. Also, the effects of number of traffic lanes and bridge types on the CO 2 emissions were briefly discussed. Finally, average annual CO 2 emissions were predicted based on road construction plans from 2009 to 2020. One of the results suggested that bridges should induce the largest emissions per meter (120.1 tCO2/m), followed by tunnels (29.6 tCO2/m) and road-only sections (7.5 tCO2/m) due to the consumption of main construction materials. © 2013 Elsevier Ltd.


Kim K.-S.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

During the heavy rainfall in July 15th 2006, a series of debris flows had occurred along the Young-Dong expressway and had blocked the road for several days. Although debris flow was recognized as a serious natural disaster which needed preventive countermeasures, no practical predictive methodology for identifying probable debris flow zone along the expressway was available. In this research, risk evaluation method for probable debris flow zone is suggested. The method defines the drainage basin near the road as a target location for risk evaluation and quantifies the hazard of debris flow in the area and vulnerability of road to debris flow by simple summation of values imposed on each contributing factors. Logistic regression analysis on the previous 46 cases of debris flow is used for determination of weight for each contributing factor. Risk rank of target locations is defined into 6 categories in terms of possibility of damage during rainfall. Application of the method could help determining the possibility of the debris flow in the drainage basin along the road and the damage of road to debris flow, thus, could be used for decision of debris flow countermeasures.


Lee H.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

The travel time estimation under given traffic conditions must provide drivers with travel time prediction information. But the present expressway travel time estimation process cannot calculate a reliable travel time. The objective of this study is to estimate the path travel time spent in the main lane between origin tollgates and destination tollgates on the expressway as a prerequisite result to offer reliable prediction information using the toll collection system data which are both useful and abundant. When estimating the path travel time, the path travel time is estimated by combining the link travel time obtained through a pre-processing process. In the case of a lack of TCS data, the TCS travel time for previous intervals is referenced using the linear interpolation method after analyzing the increase pattern for the travel time. When TCS data is absent for a long-term period, the dynamic travel time using the VDS time space diagram is estimated. The travel time estimated by the model proposed can be validated statistically when compared to the travel time obtained from vehicles traveling the path directly. The results show that the proposed model can be utilized for estimating a reliable travel time for a long-distance path in which there are a variation of travel times from the same departure time, the intervals are large and the change in the representative travel time is irregular for a short period. Estimation of travel time is first required in the known traffic situation to provide drivers with desired information about the travel time prediction but the travel time estimation method currently applied to the spot detectors on the expressways is limited in providing reliable travel time. Therefore, this study is aimed at the estimation of the travel time taken between the starting tollgate and the destination tollgate using the highly usable and rich data from the Toll Collection System (TCS) on the expressways in respect of the utilization of traffic information in order to provide reliable prediction information. In the path travel time estimation model, the path travel time on the expressways is estimated by combining the link travel time on the path. In case of missing TCS data, the TCS travel time of the previous cycle was referred to using the linear interpolation method by analyzing the increasing pattern of travel time and, in case of missing data for a long period or transit time with serious fluctuations in travel time, the dynamic travel time was estimated using the VDS Time Space Diagram. It was verified that the travel time of the path estimated using the model suggested in this study showed no statistical difference from the travel time for the vehicles for which the paths were known. The suggested model may estimate a reliable travel time for long-distance sections with large variances in the traveling time in spite of the same starting time zone, and has irregular patterns in the median values of traffic time before and after such time zone and the estimated travel time is expected to be used in the performance indexes of traffic situation and the real-time prediction of travel time.


Choi J.-K.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

A center computer system that accommodates Road Side Equipment (RSE) for traffic information consists of a Probe Server which collects, processes and provides traffic information and an Authentication & Management Server which carries out communication authentication and management through the web. In this essay, performance of the current center computer system is verified. A future expansion plan of each facility for the Road Side Equipment is also verified.


Kim I.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

Exit ramp areas, where the road design speed varies from high to low, are known to be typical freeway sections prone to accidents. However, the current design standards on exit ramps are not based on theory but just a mixture of the United States' AASHTO design standards as well as Japanese ones, which may not well accommodate the driving behavior and traffic circumstances on Korean freeways. In literature, most studies have simply focused on the dynamics between vehicles and road structures such as tapers, deceleration lanes, radii, exiting angles, gore areas, etc. for the sake of road safety. This study analyzes driving behaviors and accident data on exit ramp areas to develop a safety evaluation method for exit ramp areas. The result of analysis on the road accident data shows that spiral curve transition sections were most vulnerable to traffic accidents. This study also examines speed distributions, lane-changing points for exiting, and speed deceleration characteristics for the four different types of exit ramp areas based on the video images. To evaluate the level of design safety, the concept of DSI (Design Safety Index) is also newly proposed. This index is defined as the total sum of weighted accident rates multiplied by the ratio of the installed length over the standard one. To validate the effectiveness of DSI, statistical analysis is carried out for the two different data sets, one for accident sites and the other for no accident sites. The distribution ratio of each section length on both sites was found to be significantly different from each other. With this result, it was concluded that DSI of no accident sites was better than that of accident sites. The analysis confirms that DSI can be used as an index to evaluate the design safety of exit ramp areas.


Kwon H.-J.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

This paper designed an antenna for collecting and servicing the traffic information that applies to the Freeway Traffic Management System, as using Dedicated Short Range Communication. Active DSRC is the technology that uses 5.8GHz radio frequency to a mean frequency and there are a lot of cases occurring a physical electric wave shadowing because of the traveling straight of an electric wave. In such inferior communication environment, it constructed the stabilized communication link that can do collecting and servicing the correct traffic information and designed the beam pattern considering the establishment position of the antenna that can apply to various road environments and communication areas. Considering the communication link environment, this paper designed and manufactured the mean frequency of 5.8Ghz, the input loss of -17dB in 75MHz bandwidth, the axial ratio of 1.5:1, and 2×4 array microstrip antenna which beam pattern have the characteristic of 55° of half horizontal power beam width and 26° of half elevation power beam width and the minimum establishment height of the antenna was designed as 14m for avoiding electric wave shadowing on a physical condition between vehicles.


Kim J.-U.,Korea Expressway Corporation
17th ITS World Congress | Year: 2010

This Study is about ITS establishment of Republic of Colombia. Now Colombia is that Economic growth stimulated migration of population into urban and increased in traffic that resulted in significant deterioration of traffic utility. To solve this situation, the Colombian Government decided to formulate a nationwide plan to modernize the country's public transportation systems; A lot of countries have gone ahead ITS policy and projects to manage their Transport Environment. But there are many different methods to achieve their goal because of social, culture, legal and economic factors. Therefore, this study will provide useful information to country or city that wants to install ITS through Case Study. Korea's ITS has grown up in with expansion of city and increasing vehicles. Also, Colombia will be pushed ahead New ITS society like Korea with similar experiences. Korea and Colombia is really different to continental and growth base. but, this study show a good cooperation model to share their knowledge and systems. To conclude, the establishment of ITS in Colombia is very good chance to improve Traffic Signal Control System, Bus Information Management System and Traffic Information Center. Also ITS raises the efficiency of transportation systems, reduces social costs through rational selection and optimal resource allocation.


Cho S.-M.,Korea Expressway Corporation
Geotechnical Engineering | Year: 2010

The Incheon Bridge, the longest bridge of Korea which was opened to the traffic in 2009, is an integration of several special featured bridges and the major part of the bridge consists of cable-stayed spans to cross the Yellow Sea. All the foundations consist of drilled shafts, large diameter bored pile foundations which were penetrated into the bedrock under the seabed. A single pile-bent type foundation system was selected as well as the pile-cap type foundations. New design scheme according to the LRFD (load & resistance factor design) specification was implemented for the project. The estimation of bearing capacity and settlement of rock socketted drilled shafts was carried out based on the understanding of the site condition, the ground properties and pile load test results. The results of the load tests were thoroughly analyzed by a number of experts to determine the resistance factor, giving a unique opportunity to improve the current LRFD concept in Korea. Geotextile tubes to block seawater were made to construct the foundation at the foreshore site whose tidal difference between ebb and flow was so large. Rip-raps which were designed by physical modeling and analysis are spread around the pile to prevent the scouring of the foundation. Circular dolphin structures made of the flat sheet piled wall and in-filled aggregates surround the piers near the navigation channel to protect the bridge against the collision with aberrant vessels. The structural design of the dolphin as a ship impact protection system was performed with numerical analyses of which constitutional model was verified by the physical model experiment using the geo-centrifugal testing equipment.


Falchetto A.C.,TU Braunschweig | Moon K.H.,Korea Expressway Corporation
Journal of Materials in Civil Engineering | Year: 2016

Low-temperature cracking is a severe distress for asphalt pavement built in cold regions. When a steep drop in temperature is experienced, thermal stress develops in the different pavement layers and, as a critical temperature value is reached, cracking occurs. Hence, thermal stress represents a relevant parameter for predicting the low-temperature performance of asphalt pavements. Conventionally, thermal stress is calculated by converting the experimental results of creep compliance to a relaxation modulus and then by numerically solving the convolution integral. Hopkins and Hamming's algorithm is commonly used for this purpose in many research efforts. In this paper, the use of Laplace transformation is evaluated as an alternative approach since, by using this method, thermal stress and critical temperature can be directly and easily derived without relying on a traditional two-step computation process. The results obtained from Hopkins and Hamming's solution and from the Laplace transformation are then graphically and statistically compared. It is found that the approach based on Laplace transformation provides reliable and reasonably close results to those obtained from the more complex Hopkins and Hamming's method. © 2016 American Society of Civil Engineers.

Loading Korea Expressway Corporation collaborators
Loading Korea Expressway Corporation collaborators