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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 23, Issue 6D - Nov 2003
Volume 23, Issue 6C - Nov 2003
Volume 23, Issue 6B - Nov 2003
Volume 23, Issue 6A - Nov 2003
Volume 23, Issue 5D - Sep 2003
Volume 23, Issue 5C - Sep 2003
Volume 23, Issue 5B - Sep 2003
Volume 23, Issue 5A - Sep 2003
Volume 23, Issue 4D - Jul 2003
Volume 23, Issue 4C - Jul 2003
Volume 23, Issue 4B - Jul 2003
Volume 23, Issue 4A - Jul 2003
Volume 23, Issue 3D - May 2003
Volume 23, Issue 3C - May 2003
Volume 23, Issue 3B - May 2003
Volume 23, Issue 3A - May 2003
Volume 23, Issue 2D - Mar 2003
Volume 23, Issue 2C - Mar 2003
Volume 23, Issue 2B - Mar 2003
Volume 23, Issue 2A - Mar 2003
Volume 23, Issue 1D - Jan 2003
Volume 23, Issue 1C - Jan 2003
Volume 23, Issue 1B - Jan 2003
Volume 23, Issue 1A - Jan 2003
Selecting the target year
Delay Predictive Modeling on the Diverge Sections of Urban Freeway Interchange based on Real-Time Traffic Characteristics
Jang, Tae-Jun ; Kim, Jung-Hoon ; Lee, Eun-Jin ; Kim, Tae-Gon ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 429~437
From the results of the real-time traffic characteristic analyses, construction and verification for the delay predictive models on the diverge sections of the urban freeway interchange under the study, the following conclusions were drawn: i) Variables selected were considerably correlated with the delay predictive modeling on the diverge sections of urban freeway interchange under the study. Particularly the occupancy showed a higher explanatory power for the delay predictive model construction. ii) The delay predictive models showed a higher explanatory power in the inbound direction and the daytime period, but a lower explanatory power in the outbound direction and the nighttime period. iii) The urban freeway traffic management system (UFTMS) measure like the variable message sign(VMS) was thought to be more effective on the inbound exit ramp in the morning rush hour
A Study on the Design Parameters of Subgrade Soil by Different Compaction Methods
Park, Seung-Mok ; Lee, Kwan-Ho ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 439~448
It has been widely used the proctor compaction and laboratory tests for evaluation of its design properties and compaction characteristics for subgrade soils. However, the compaction roller with static load has been used for compaction of subgrade soils. The purpose of this research was to evaluate the design properties of subgrade soil, which was compacted by Servopac gyratory compactor to simulate the field compaction. Field compaction data and couple of properties were collected from road construction site. Disturbed soils was used for laboratory compaction and gyratory compaction. For the comparison, block sampling was conducted on the subgrade after finishing the final compaction. Uniaxial compression strengths for field specimen from block sampling and specimen by Servopac gyratory compactor are almost same. But, those of specimen by D-method and A-method using proctor showed a little big difference for those of field specimen. This means that evaluation for design properties for subgrade soil by proctor compaction is not proper and gives the higher values than that of field compaction-soil. Judging from the un confined creep test, the trend of settlement is very closed between field compaction soil and gyratory compaction soil.
Effects of Environmental Factors in National Highway under Free-flow Speed
Do, Myung-Sik ; Kim, Myung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 449~460
This paper presents an overview of the environmental factors that affect the distribution of vehicles' speed. While related laws and regulations about roads stipulate the driving speed basis or limit, the existing standards of driving speeds are set based on the geometrical conditions of roads. In other words, they do not consider the weather conditions such as rain, frost, snowdrift, fog, etc. and slope of roads. Roadway and weather data were acquired from Ministry of Construction & Transportation and Korea Meteorological Administration. Three continuous traffic survey sites and one selected sites along the national highway between Daejeon and Gongju city were analyzed. Two independent samples t-test, ANOVA(Analysis of Variance) and multiple comparisons were conducted to determine if there is a difference in the average speed of vehicles between daytime and nighttime and between clear days and rainy days. Analyses of the data for each weather condition show that there was a significant difference in speeds amomg clear days, a rainfall of
and a rainfall of
. Upon the completion of the construction and installation of the WIS (Weather Information System). driving speeds should be variably regulated (or provided) in accordance with road conditions, weather conditions, and the steepness of roads rather than the sizes and functions of roads.
A Study on the Estimation of PCU in the Rural Highway
Oh, Ju-Sam ; Han, Dae-Cheol ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 461~466
Passenger car unit is a key parameter to study the level of service and capacity of a highway. It is a adjustment factor for truck and bus to consider their impacts to traffic flow on highway. It can be obtained by calculating the impact of large vehicle with respect to a passenger car under the same traffic volume and control condition. Current domestic study only deals with one unique method that estimates PCU by headway. The study focused on the way to estimate PCU considering traffic volume and speed and compared it with existing method. PCU for median and large vehicle was given 1.3 and 1.5 respectively by the method with headway. However, the PCU for the same classes of vehicle was given 1.5 and 2.4 by considering traffic volume and speed. It can be concluded that the two method gave the similar results for the medium size vehicle, while the second method gave higher value in the case of larger vehicle. Considering the limitation of data used in this paper, only PCU on the level area was presented, however, further study about PCU on rolling and mountain areas should be required.
Analysis of Route Choice Behaviors and Development of Route Choice Model Considering Delay Penalty of Driver
Byun, Wan-Hee ; Iida, Yasunori ; Kim, Ju-Hyun ; Uno, Nobuhiro ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 467~477
A traffic information providing service by ITS technology aims to improve social and individual benefits. To build these services should be carried out in the first step, a precise analysis of route choice behaviors by characteristics and situations of drivers. Therefore. in this study, situation of a driver was categorized by the degree of late penalty on the traffic network with limitation of time. The effect on path choice behavior was also analyzed by difference between the late penalties that obtained through questionnaires and constructed the path choice model with the late penalty. With the investment data by questionnaire, t test were employed to analyze route choice behaviors, which showed that the route choice behaviors with the big penalty degree and those with the small penalty degree were significantly different. The models were of two utility functions of the types, one with penalty, the other without penalty. The result showed that the model with the penalty was more ,superior in goodness of fits test and significant test of models. It analysed imaginary highway network through a simulation that applied the model considered delay penalty and the model not to consider it. The result turned out that the model considered delay penalty is useful in analysis of highway network. If this model is applied in network simulation analysis, effects on the network by traffic information services can be caught more exactly. From these results, it is expexcted that this model considering delay penalty can keep up with many drivers' characteristics and situations, and apply research of a field like a dynamic fare system.
Traffic Accident Frequency Model using the Genetic-Supervised Artificial Neural Network
Gong, Sun-Hoi ; Nam, Doo-Hee ; Lee, Yong-Taeck ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 479~487
The purpose of this study is to develop the traffic accident frequency model using genetic supervised-artificial neural network in order to analyze the relationships between accidents frequencies and geometric characteristics, The accident data were collected in Honam expressway for five years
. The independent variables are the geometric characteristics (access control, vertical slope, super-elevation horizontal curvature,) and the dependent variable is the accident rate per MVK (million vehicle km). The artificial neural network model seems to be more accurate than conventional regression model. Furthermore, the artificial neural network model has an advantage over regression model in describing the non-linear characteristics of continuous variables (vertical slope, super-elevation and horizontal curvature). In the artificial neural network model, the accident factors are further analyzed by the sensitivity test. The artificial neural network model shows that the accident rate is the non-linear characteristics when the continuous variables (vertical slope, super-elevation and horizontal curvature) increase. At the critical point of each value, accident rate greatly increase.
Development of a Technique for Producing Regional Travel Time Based on the Location of Mobile Phone's Base Stations
Kim, Si-Gon ; Lee, Chang-Jin ; Sung, Nak-Moon ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 489~494
This paper suggests utilizing mobile phone's Base Stations as a surrogate of traffic detectors which is essential to collect traffic flow information and to produce travel time. In the beginning, the communication network of mobile phones are introduced. Also, the characteristics and restrictions of data from mobile phone's Base Stations are analyzed. The map matching technique and the algorithm of travel time estimation is described. All these techniques are applied to Olympic road and Gangbyun Road in Seoul by three different polling times,5 minute, 10 minute, and 15 minutes. As a result, the polling time of 10 minutes is found to be the most optimal one. The travel time is also estimated within the range of 80% reliability. This research shows that the mobile phone's Base Stations can be used as a surrogate of traffic detectors in the regional travel time estimation.
Development of a Traffic Accident Prediction Model by Level of Roads and Traffic Characteristics
Lee, Soo-Beom ; Kim, Jeong-Hyun ; Hong, Da-Hee ; Yoo, Chang-Nam ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 495~504
The current procedure of estimating accident reductions shows fixed accident rates for each level of roads without considering the various characteristics of roadway geometries and traffics. In this study, in order to solve the problems mentioned in the above, models were developed considering the characteristics of roadway alignments and traffic characteristics. The developed models can be used to estimate the accident rates on new or improved roads. With the developed models, it is possible to evaluate the safety level on a road improvement project. In this study, only rural highways were included as a beginning stage. First of all, factors to influence accident rates were selected. Those factors such as traffic volumes, number of signaled intersections, the number of accessing points, number of pedestrian traffic signals, and design speeds are also selected based upon the obtainability at the planning stage of roads. The relationship between the selected factors and accident rates shows strong correlation statistically. In this study, roads were classified into 4 groups based on number of lanes, level of roads and the existence of median barriers. The regression analysis had been performed for each group with actual data associated with traffics, roads, and accidents. The developed regression models were verified with different data set. The result of the verification shows that the developed models show the strong relationship between the estimated accident rates and actual ones. On freeways, traffic volumes were identified as the most significant factor on the developed model. On two-lane rural highways, traffic volumes and the number of connecting roads were identified as significant factors on the developed models. On four lane rural highways, traffic volumes and the number of signalized intersections were selected without median barriers and only the number of signalized intersections was selected with median barriers. In this study, in order to develop the proposed models, only data on a limited area were used. In order to represent whole area of the country with the developed models, the models should be re-analyzed with more data.
Methods for Improving the Capacity of Multilane Highways and Evaluation
Choi, Kee-Choo ; Oh, Young-Tae ; Kim, Jeong-Hyun ; Choi, Yoon-Hyuk ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 505~514
Multilane highways generally have posted speed limits of between 40 and 55 mph
and have four or more lanes, often with physical medians or two-way left-turn-lane (TWLTL) medians. They are typically located in suburban communities leading to central cities or along high-volume rural corridor that connect two cities. Recently, rampant access and frequent installation of traffic signals decreased the capacity of multiple lane roadway. By surveying some national road segments, some identification of the factors decreasing the capacity have been made along with some alternatives to be applied for the road number of 17,38, and 3 of national roads. Simulation study showed that the left turn bay was very important in maintaining smoothing flow of traffic and the installation of this is expected to be very cost-effective together with the installation of climbing lanes for slower traffic.
Development of Cost-Effective Criteria Determining the Existance about Installing Median Barrier
Park, Je-Jin ; Kim, Jeong-Hyun ; Ha, Tae-Jun ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 515~526
Statistics for Traffic Accident, 2001
by Korean National Police Agency, the measurement of accident damage, "Fatal Rate" for the median encroachment accident is the highest value with the overspeed accidents, and the median encroachment accidents occupied 39.5% of the severe accidents. In 2000, percentage value of 6.52% for the median encroachment accident was occurred in total accidents and the rates for the dead and the wounded in total ones are 14.38% and 8.21%, respectively. Therefore, all sorts of facilities such as median barrier, road stud, and optical guidance rod have been installed to reduce the number of the median encroachment accidents. However, there are no specific criteria related to installing the facilities, which results in economic traffic accident expense loss as the result of occurring the median encroachment accidents and waste of country financial resource by excess establishment of median barriers and they cannot be overstated. Forecasting models for the median encroachment accidents in tangent section on rural two-lane highway were established before. In addition, this paper presents forecasting models in tangent and curve sections on rural two-lane highway and rural four-lane highway and then calculations related to social expense for the median encroachment accidents. Traffic accdient expense loss can be at the least and economic benefit can be at the greatest as criteria of determining the existence for installing the cost-effective median barrier are represented.
Determination of the Length of Acceleration Lane Considering Merging Probability
Kim, Sang-Gu ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 527~536
This study proposes a new methodology of determining the length of acceleration lane in which merging characteristics and behaviors are considered. In this study the traffic data were investigated at 3 merge areas on freeways through the video recording and after analyzing the traffic data the critical gap and the merging probability equations were made through a regression analysis. Finally, a new model for the determination of the length of acceleration lane has been developed using the critical gap and the merging probability equations. The length of acceleration lane by this models is calculated with regard to the ramp design speed as well as the shoulder lane volume. The result showed that the length changed more critically in proportion to the shoulder lane volume than the ramp design speed. This means that the length of acceleration lane may depend on the opportunity of merging that is decided by gap distribution in the through-traffic stream. This study recommends that the length of acceleration lane should be selected the grater value between two values calculated by the proposed method and by the existing method.
Construction Information Management System using Web-based Integrated Database
Kang, Leen-Seok ; Seo, Jung-Hun ; Kwak, Joong-Min ; Kim, Chang-Hak ; Ji, Sang-Bok ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 537~547
Recently, our construction industry is using various work sections classification systems for civil engineering projects, however, it is difficult to connect construction operation information from construction site to standard specification or standard method of measurement. This study suggests a methodology to link the construction work sections information, such as cost, schedule, drawings and specification, with civil engineering standard method of measurement. And the methodology suggested in this study is verified by a web-based work sections information management system with an integrated database (IDB). The web-based system is based on the data flow diagram (DFD) and entity relationship diagram (ERD) method for modeling IDB. And the integrated DB system for drawings and schedule can be used in schedule simulator for 4D CAD tool.
A Study of GPS Ship Navigation System Using Precise Coordinate Conversion Algorithm
Chang, Yong-Ku ; Mun, Du-Yeol ; Jung, Beom-Seok ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 549~557
The most recent GPS is working on CNS (Car Navigation System) and personal terminal, but the ocean has not been. First studied GPS is sailing to ship but we have been connivance that the ship is not need detail navigation. Lately, Harbor facilities and transportation service in harbors are complication. We have need accurate ship navigation system. In this paper, author developed algorithms of ellipsoid conversion between WGS84 and BESSEL and developed algorithms of map projection between ellipsoid coordinate system and plane cartesian coordinate system. Author used 3-parameter in coverting ellipsoids and used TM and UTM projection in converting between ellipsoid and plane cartesian coordinate. And author analyzed errors through static surveying and kinematic surveying of GPS for proving accuracy of GPS sensor. Furthermore author analyzed displacement value of received position. Finally author developed real time ship navigation system using cheap GPS sensor.
Registration of Multi-Sensors Satellite Imagery Using Patch Matching
Yoo, Hwan-Hee ; Kang, Sung-Bong ; Zo, Hyung-Zin ; Kim, Ki-Yeol ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 559~565
With application field of satellite images increasing, various satellite images from the different type of satellite sensors have been provided. Especially, image registration is required to integrate different sources into same reference frame(i.e. a local geodetic system), when analyzing a terrain using images acquired from multi-sensors such as active and optical sensors. In this study, registration method by patch matching was developed with the KOMPSAT and the RADARSAT images. For the study, patches were extracted by thresholding and speckles included in the extracted patches were eliminated by using Morphology algorithm, and then patch matching was implemented by cost function. Furthermore, image registration was performed by using a transformation function after finding the centroids of the conjugated patch existed in the KOMPSAT and the RADARSAT images, and accuracy for the registration was evaluated.
Geometric Modeling Evaluation and Error Correction for Header files of KOMPSAT-1 Satellite Imagery
Yoo, Hwan-Hee ; Sohn, Hong-Gyoo ; Kim, Seong-Sam ; Jeong, Ju-Kweon ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 567~576
To obtain 3 dimensional position information with KOMPSAT-1 satellite images, this paper used a header file containing ancillary data. When using this, there is a merit which can use with minimum GCPs in satellite sensor modeling. Therefore, in this paper, we analyzed and evaluated the difference between the modeling methods with respect to ECI and ECEF coordinate system. Also, we proposed a method which can correct attitude data as well as satellite orbital parameters in processing of KOMPSAT-1 strip images to improve the accuracy for 3D positioning. Experimental results indicated that correction method suggested in this study was more accurate than the previous method which was corrected only the orbital parameters and coordinate origin shifts, and it showed improved accuracy of
Estuary Riverbed Monitoring Combined by GPS and Echo Sounder
Park, Un-Yong ; Kim, Chon-Young ; Kim, Yong-Bo ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4D, 2003, Pages 577~589
Currently, the efficiency of GPS has been increased in the various precise survey like as the control survey and the navigation etc.. Also, it is widely used in the deformation analysis of the structure, the measurement of the marine tides, the measurement of the river level and the topographic monitoring of seabed or riverbed by combined the measurement equipment for depth. In this study, we intend to increase in efficiency of the topographic monitoring of seabed or riverbed by combined with DGPS, RTK GPS and echo sounder. For this study, we defined the error correction of the echo sounder with the experiment of water tank, which is considered the characteristic of estuary riverbed and then we developed the s/w for 3-dimensional monitoring of estuary riverbed and applied the s/w to field test and improved the various problems. On analyzing topography of estuary riverbed by combined GPS with echo sounder, the draught error which is yielded to change of length from the water surface by the movement of survey vessel to the end of the transducer was eliminated by geometrical rearrangement and we defined the correction formula,
. The sounding error about the echo sounder and characteristic of estuary riverbed was found by understanding the relation of average diameter and residual error and we defined correction formula,
by the regression analysis. and then we verified applicability of correction formula.