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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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Korean Society of Civil Engeneers
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Volume & Issues
Volume 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
Selecting the target year
A Study on the Effect of the Median on the Traffic Flow and Accident
Lee, Hee-Sang ; Park, Jun-Hwan ; Lee, Young-Ihn ; Oh, Ju-Sam ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 515~522
The purpose of this study is to suggest foundation that provides logical basis of median barrier establishment through more reasonable and systematic analysis, and consider various practical use plan of median barrier hereafter ultimately. It is necessary that try to examine closely safety improvement appeared ultimately via series step and process if the median barrier establishes. Through this process, I analyzed using various index such as average speed, velocity dispersion, speed gap's dispersion, accident rate, lane use pattern of vehicles, total accident rates. The main results of this study are as follows : when median barrier establishment examines effect that get in traffic flow characteristics, median barrier was exposed that both average speed in placed section and velocity dispersion decreased all and also, displayed stable velocity distribution by equipment of median barrier. Through this, median barrier establishment could know thing that traffic flow was changed more stable. And both velocity dispersion and speed gap's dispersion changed to consistent direction having relation of a sheep each other with change of total accident rates.
Classification Method of Homogeneous Road Section for National Highway
Do, Myung-Sik ; Kim, Sung-Hyun ; Moon, Hak-Yong ; Kim, Myung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 523~533
This paper provides a methodology to determine homogeneous road section for the effective control of traffic flow in national highway by integrating the data on roadside land use property, detector data and traffic characteristics of intersection. To determine homogeneity, 3 step decision scheme, which consider 1) area aspects, 2) line (or section) aspects, 3) point (or intersection) aspects for homogeneous road section is presented based on the detector data such as 5-minute traffic volume and speed that are acquired over the national road No. 3 and referenced at the intersection franc survey data on weekday/saturday/sunday. The homogeneous road section that is presented in this paper is divided into upstream and downstream in consideration of the characteristics of national road No.3 and finally 12 homogeneous road sections are classified in case of upstream from Taepyeong intersection to Seongnam city while 14 homogeneous sections are classified in case of downstream, a reverse direction. Furthermore, a study of the classification method on seasonal homogeneous road section is required in the future.
An Initial Toll Estimation of The Incheon Airport Exclusive Highway
Kim, Si-Gon ; Kang, Seung-Pil ; Oh, Jae-Hak ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 535~541
This paper aims to introduce the process to estimate the initial magnitude of toll for Exclusive Expressway between Seoul and the Incheon International Airport. Based on the 1999 basic plan for private capital investment and the implementation agreement the initial toll was estimated as 6,100 won for small vehicle as of April 2001. The optimal toll ratio between modes are to be 0.8, 1, 1.7, 2.2 for sub-compact, small, medium, large vehicle, respectively. In terms of toll fees, they are 4,900, 6,100, 10,400, 13,500 Won respectively. The magnitude of toll itself was compared to that of England, Japan and Korea Highway Cooperation. It was concluded that the toll is 1.3 times expensive than that of Korea Highway Cooperation, while it is reasonable compared to that of England and Japan. Discount issues and their countermeasures were suggested at the end of paper.
An Application of Kalman Filter Algorithm to Real-Time Traffic Information
Bae, Sang-Hoon ; Lee, Hui-Jong ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 543~547
Recently more actual and concrete real-time traffic information is demanded highly according to traffic volume increases. However it is difficult to provide reliable information using the past link speed data obtained from existing detector. Therefore a new prediction model generates and offers accurate real-time traffic information should be developed. In this paper, the Kalmanfilter model, forecasting the bus arrival time for users, inquired onto and compared to the prediction models constructed with field data. As a results, it is judged that KF3 model is more accurate and more suitable than the others. This mean that Kalmanfilter algorithm, continuously updating a prediction and decreasing an error with a measurement equation and an error covariance, reflects the real-time traffic conditions through the fitting construction as pattern data.
Speed Conversion Models within the Ramp Junctions of the Urban Freeway
Park, Yeo-Jeong ; Ahn, Hyeun-Chul ; Kwon, In-Yeung ; Kim, Tae-Gon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 549~554
From the results of the speed characteristic analyses, construction and verification of the speed conversion models within the ramp junctions of the urban freeway, the following conclusions were drawn: i) Speed showed a considerable difference in case of using the time mean speed for the space mean speed in the traffic characteristic analyses within the ramp junctions of the urban freeway, and also thought not to be highly confident in case of applying the existing speed conversion models to the urban freeway in Pusan. ii) The speed conversion models were shown to be highly explanatory and significant by showing the high correlation coefficients of the speed conversion models constructed for the conversion of the time mean speed into the space mean speed within the ramp junctions of the urban freeway depending on the direction and the type of the ramp junction, and also thought to be highly confident in case of applying to the traffic characteristics within the ramp influence area of the urban freeway in our county.
A Simple Method Employed in Network Assignment for Estimating Roadway Capacity
Kim, Hyung-Jin ; Lee, Yeon-Hwa ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 555~562
The purpose of this study is to estimate the capacity of an interrupted flow including signalized intersections in urban areas. Users choose the route to minimize their own travel cost in the user equilibrium assignment of network assignment methods. Therefore, travel demand depends on the accuracy of travel cost. Furthermore, travel cost depends on link capacity, so that to estimate link capacity exactly is very important. A field study for this purpose was performed. A link capacity was measured actually at eleven intersections, and the capacity function of the number and the types of lanes and the activity level of the area was derived from the result of this survey.
Developing CA(Cellular Automata)-Based Simulation Models for Pedestrian Traffic Flows
Son, Young-Tae ; Park, Woo-Shin ; Kim, Sang-Gu ; Kim, Tae-Wan ; Kim, Young-Ho ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 563~568
Walking is one of fundamental means for trip. Walking has a lot of advantages compared with another means of trips for traffic accidents and air pollution with. But the research for flow is in a poor way in recent years. When pedestrian facilities are designed, enough space is given to pedestrians. Otherwise, pedestrians have a lot of possibility in accident. Nobody concentrates with this kind of situation which has an effect on pedestrians flow. First of all, We have to study for pedestrians flow to made design criteria for pedestrians facility. This study analyzes the characteristics of pedestrians flow using micro simulation techniques. This study focused on a short section in pedestrians facilities. Because the criteria which apply to a short section is used in whole section. Pedestrians flow doesn't have channels like traffic flow. Pedestrians flow is also self-propelled object unlike traffic flow because a pedestrian moves rapidly for acceleration/deceleration. So macroscopic simulation model is not suitable for analyzing pedestrians flow. This study uses CA(Cellular Automata) for analyzing pedestrian flow. CA model which is based on cell have finite state automata in grid lattice. CA model is adapt to pedestrian flow for application and composition. We developed Simulation model which is suitable for our country based on CA model and yielded simulation data. We estimate the simulation data comparing with field data. We expect to use this study for displaying pedestrian flow and making criteria for pedestrian facilities.
Forcasting of International Air Transport Demand of South Region to Consider Behavior of Access
Jeong, Heon-Yeong ; Kim, Seong-Chun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 569~578
By airport extension project concentrating in the capital region, it is getting more difficult for southern international air passengers to access and transfer to Incheon International Airport. Increasing transfer through Kansai and Narita International Airport in Japan is producing a contrary result that promotes Japan airports' role of Northeast Asia hub. In this situation, necessity of constructing new southern international airport that acts as a gateway of cosmopolitan city is increasing. The purpose of this study is to examine the behavior of southern passenger's international airport use and the changed international airport using area considering changing access behavior by KTX. For this purpose, this study utilizes data from a questionnaire about behaviors of international airport for inhabitants in Gwangju Jeolla and Daegu Gyeongsanbukdo area where is boundary between Incheon Internatinal Airport and new southern international airport considering both time and cost. This study also employed nested legit model to examine the factors influencing on air transport demand and airport choice.
A Study on the Establishment of Transportation Planning Areas
Kwon, Young-Jong ; Kim, Hwang-Bae ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 579~584
The transportation planning area is defined as a spatial scope for transportation planning, which affects socio-economic activities such as commuting, shopping, etc. Until now, the transportation planning area has been established based on the transportation affecting areas of the central city of a metropolitan area. As a result, it is difficult to make transportation plans considering travel patterns between two associated regions in the metropolitan area. This study re-established transportation planning areas considering the O/D based travel patterns between two adjacent regions. It shows several characteristics as follows. Firstly, the transportation planning areas tend to expand in the unit of mid-sized traffic zone as the city size increases. Secondly, the transportation planning areas tend to expand extensively along the traffic corridors containing major highways and rails. And, the commuting areas correspond to attending school districts in small and mid-sized cities. To prove them, the questionnaire survey was performed for transportation officials in 60 cities nation-wide. The survey results show that the transportation planning areas based on the travel patterns mostly correspond to those based on the questionnaire survey in small and mid-sized cities. However, the ratio of coincidence can be between 50 and 60 percentage in large cities. The study results can be utilized for the re-establishment of transportation planning areas. And, also they can be used as basic data for dividing identical school groups.
Variation and Sensitivity of Network Traffic Patterns In the Microscopic Traffic Simulation Analysis
Kim, Ik-Ki ; Lee, Jo-Young ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 585~592
In recent researches, several dynamic path-based microscopic franc simulators were developed and applied to real traffic analysis. However, such dynamic path-based traffic simulators are still on the way of testing stage. Therefore, it is necessary to identify and understand the characteristics of the simulator more clearly before applying them to real policy analysis. This study used MITSIMLab as a dynamic path-based traffic simulator, which was developed by the ITS program at MIT. In order to identify the characteristics of MITSIMLab and its performance, the study analyzed sensitivity of traffic flow patterns depending on the value of parameters in major models of the simulator. This analysis will give some clues which models and parameters are more carefully calibrated in order to keep reasonable accuracy of simulation results. In other words, this study performed simulation analyses several times with same network and same data, because simulation analysis could give different results every time due to its stochastic attributes. The analysis showed that the variation of speeds was increased as the level of congestion increased with repeated simulation results. Then, the study calculated the average, standard deviation, maximum and minimum values of travel time, speed, volume, length of queue with the simulation results. After those analyses, other simulation analyses were performed again with same network and data with different value of a parameter in the model of MITSIMLab. Finally, the study compared the results of two simulations using different value of a parameter to see the sensitivity of franc pattern by a parameter value. The study found that the simulation results are most sensitive to the value of parameter in the car following model. The study also tested that only one simulation could represent the average of many times of simulation by showing. the deviation of traffic patterns with many simulations.
A Study on Application of TRANSIMS in Korea
Choi, Hyun-Joo ; Chung, Jin-Hyuk ; Kim, Ik-Ki ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 593~600
This paper aims to review the previous and on-going studies for TranSIMS, which is an activity-based simulation model. At the same time, modules embedded in TranSIMS are tested using data currently available in Korea. In this study, Population Synthesizer module is applied to a case in Korea to find problems, which can be emerged in utilizing data in Korea. Based on the study, several ways to overcome the problems found in the case study are proposed. As a conclusion, while TranSIMS has several problems to break through in application to Korea, it is still a promising simulation method and needs more research and study in the near future.
A Study on Evaluating Model's Development of Asphalt Pavement in Metropolitan
Jo, Byung-Wan ; Tae, Ghi-Ho ; Ku, Ja-Kap ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 601~608
In this study, PER(Pavement Evaluation Rates) was developed to meet standard requirements for pavement evaluation of cities such as Seoul by considering a breakdown distribution. PER consists of Pavement Evaluation Rates and comprehensive Evaluation Rates for crack, rutting and IRI. IRI wasn't matter of consideration but it is used to express the range as an item for damaged section of pavement. And also PER is divided by evaluation equation according to a driveway, a principal and aid road, on the basis of that not only the order of precedence, Maintenance & Rehabilitation, budget policy was selected to support pavement management works well but also Pavement management tool was developed to be able link with previous PMS Database. As compared with MCI, previous evaluation rates at cities and a naked eye survey, PER shows similar results of those.
A Study on Performance Characteristics of Modified Transparent Binders Used in Color Asphalt Pavement
Lee, Suck-Hong ; Kim, Nak-Seok ; Jo, Shin-Haeng ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 609~615
The main objective of this study is to evaluate characteristics of modified transparent binders used in color asphalt pavement. The dynamic shear rheometer (DSR) test is performed to analyze the viscous and elastic behavior of asphalt binder. As a result of the DSR test, modified transparent binders meet Superpave specification on rutting and fatigue cracking. Values of
of modified transparent binders are higher than those of conventional transparent binders at low temperatures. These results are expected to increase thermal cracking resistance at low temperatures. The specimens of three colored asphalt mixtures and a dense-grade AC
asphalt mixture were prepared, then the Marshall test, indirect tensile strength test, and the wheel tracking test were performed on these samples. According to the test results, color asphalt mixtures revealed a good resistance against thermal cracking and fatigue cracking.
Effect of Benchmarking based on U.S. Cases
Park, Hee-Sung ; Lee, Sang-Hoong ; Thomas, S.R. ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 617~622
Benchmarking, a continuous performance improvement process, has been recently introduced in the construction industry. This paper introduces a Cosntruction Industry Institute(CII) benchmarking program that has initiated and performed benchmarking practice in construction and shows results of benchmarking research. Recently CII adopted web based technology to collect, analyze, and provide feedback in real time. Data for cost, schedule, safety, practice use, and productivity are now collected on-line during project execution from the most remote project sites. Confidential reports are returned online showing metric scores, performance quartiles, and graphical comparisons of individual project performance to a database of similar projects. A background and a descriptive discussion of the database is provided, and a few key finding from the data analyses are presented. The result of this paper also shows that benchmarking can be also implemented in Korean construction industry.
Critical Evaluation of CM Services on Urgent Waterways Recovery Construction Project due to Natural Hazard in Domestic
Choi, Jae-Ho ; Yu, Jae-Hee ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 623~630
Recently, CM contracts have been remarkably increased through the efforts of the interested parties in domestic. However, continuos increase in the amount of CM contracts is skeptical due to the lack of information regarding the effectiveness of CM method and studies designed to differentiate CM method from construction Supervision as well. Both of them are main research areas to expedite CM method in domestic by enabling owners to understand the CM services. Along with this, an urgent waterways recovery construction project to which CM method was applied has been chosen as a best practice by the board of audit and inspection based on its excellence of the performance. In order to understand the effectiveness of CM services in the type of urgent waterways construction recovery project, a comparison study between the CM project and 4 other projects (two of them use construction Supervision and the rest use CM only in construction phase) is conducted based on the two Key Performance Indicators (KPIs): construction cost growth and construction schedule growth. This study indicates that CM method could be more effectively used by meeting the project needs especially in schedule aspect than cost aspect. In addition, the effectiveness of CM services in urgent water-way recovery construction project has been understood by closely examining the relationship between the KPIs and CM services.
A Study of Forming Areas of Uniform Characteristics within Metropolis: Analyzing socio-economic Indexes
Yoon, Hyo-Jin ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 631~639
This study examines population movement in metropolis, its characteristics and the relevant factors. To pursue this topic, a case study is conducted of some selected areas within a metropolis where there is changed population structure in accordance with a pattern of metropolitan population change. Through this case study, an analytical framework has been established for comparing and analyzing the population structure within unified areas of metropolitan cities and relevant socio-economic index, which can be used as a basis for planning and analyzing urban spatial structure. Through such an analysis, the findings of this study are summarized as follows: It is well verified that in the case study area of Incheon metropolitan city 10 Gus and Guns could be grouped into 5 unified areas, each of which shows similar social, economical, and regional characteristics. In the meantime, Gus and Guns in the same group show a close relationship with their neighboring areas. Moreover, based on the 5 socio-economical factors identified of 5 groups as well as each of the Gus and Guns within them, it is shown that some Gus and Guns constitute a unified group while an autonomous district constitutes a group by itself.
Improvement of the Sensor Model of SPOT Imagery Through the Image Coordinates Corrections
Kim, Eui-Myoung ; Jung, Won-Jo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 641~647
Scale modification along the scan line is considerably important in the case of satellite which acquire stereo coverage by tilting its sensors; roll angle of the sensor should be considered. In this research, a methodology has been developed to estimate roll angles of SPOT satellite imagery which are widely used in variety of applications using ground control points. The estimated roll angle will be used to compensate for image coordinates where the relationship between object and image space is modelled by two-dimensional anne transformation. Also, several abstract sensor models such as two-dimensional affine transformation, direct linear transformation(DLT), and self-calibrating DLT which have been used as alternatives of rigorous sensor model are compared with proposed models in its accuracy using two dataset of SPOT satellite imagery. The simplicity and accuracy of proposed method was proven by this study. The method of compensating image coordinates by roll angle is also applicable to satellites adopting linear CCD array to obtain stereo coverage. In terms of applications, two-dimensional affine transformation has a linear property with respect to epipolar geometry. Therefore, it is possible to search conjugate points in image matching efficiently than existing models which do not have linear property of epipolar geometry.
Three Dimensional Digital Buildings Modeling for Generation of Large Scale Orthoimage
Kim, Eui-Myung ; Choi, Jong-Hyun ; Sohn, Hong-Gyoo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 649~656
It is a critical step to remove relief displacement caused by building height when a large-scale orthoimage is created over the urban areas. Most of current researches for building modeling are concentrated on image-based approach. The image-based approaches, however, need several complicated digital image processing steps to identify the building boundaries. In this study we proposed a method to automatically model building heights using the exterior orientation parameters of the image and the existing digital map and crated a orthoimage over the study area. The mathematical model of occluded area caused by building height was also set up using the information of the perspective centers. The accuracy of the orthoimage including the building areas was less than 1 pixel. Resulting orthoimage shows more information than the existing digital map qualitatively and quantitatively.
Design and Implementation of GUI for Aerial Triangulation Software
Yom, Jae-Hong ; Choi, Sun-Ok ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 657~662
Efficient representation is crucial in the analysis of complex geospatial information. In case of aerial triangulation, most of currently available software programs are designed as black boxes where only an experienced user would be able to prepare the preformatted input file and interprete the result of the adjustment. This paper introduces a solution to this problem through the UML design of a Graphical User Interface (GUI) for the aerial triangulation task. The design was then implemented and then applied to the result file of Match-AT, a commercial software from Inpho. The error of the exterior orientation of each aerial imagery was represented with a 3-D error ellipse, enabling the visualization of the adjustment result. The attributes of images and points (control points, tie points and image points) were maintained as a database which enables the searching and querying of adjustment information.
Accuracy Evaluation of DEMs Generated by Height Bias-Corrected RFM and InSAR -for Ikonos and JERS-1 SAR Images-
Lee, Dong-Cheon ; Yom, Jae-Hong ; Kim, Chung ; Lee, Young-Wook ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 4D, 2004, Pages 663~671
Recent spaceborne sensor technology Provides efficient and reliable ways to obtain spatial information about surface of the Earth. Accurate topographic mapping, 3D reconstruction (i.e., DEM), and ortho-image generation using high resolution satellite images and synthetic aperture radar(SAR) data are getting more practical. In consequence, use of those kinds of imagery increases in various fields of application. However, some satellite images such as Ikonos do not provide physical sensor information instead, rational polynomial coefficients(RPCs) are available because the data vendors want to keep confidential the sensor information. The objectives of this study we: (1) Generation of DEM from Ikonos images using rational function model(RFM), (2) Generation of DEM from JERS-1 Interferometric SAR(InSAR), and (3) Analysis of quality of the DEMs for different terrain types. Ground control points(GCPs) and check points on the images were utilized to assess overall accuracy and terrain-dependent accuracy of the DEMs, respectively. In case of Ikonos images for study site, planimetric accuracy was 8.03m and height accuracy was remarkably improved from 13.71m to 1.02m after correcting bias from RM (i.e., Bias-corrected RFM). As for the Shh images, range of the height accuracy was between 10.50m and 54.77m depending on the selection of GCPs. RMSE of the height for urban, forest and flat area were 23.65m, 8.54m,0.99m, respectively for Ikonos image while the corresponding RMSE were 31.83m, 18.34m, 10.88m, respectively for SAR image with optimal selection of GCP.