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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 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
Application of Artificial Neural Networks Approach for Freeway Incident Detection
Jang, Se-Bong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 273~273
In this paper, the application of artificial neural network(ANN) approach for freeway incident detection is demonstrated. The ANN model adopted is the multi-layer perceptron and trained with the backpropagation algorithm. The ANN alternatives, of which input data sets are composed of occupancy, occupancy volume, and occupancy volume speed, are prepared and the best ANN model is selected through training and testing them. To train ANNs, the data sets generated with FRESIM are used. The test section is Suwon to Osan IC in the Kyungbu Expressway. The performance of the ANN model is compared with those of the California algorithms; the ANN model produces substantially improved detection performance in terms of detection rate, false alarm rate and time-to-detect.
Early-Strength Slag Cement Concrete for Early Opening Highway to Traffic
Yun, Kyong-Ku ; Yoo, Tae-Seok ; Kim, Jin-Chun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 283~283
Early-strength slag cement of very fine powder was developed to increase the activity so that early-strength development might be faster than that of Portland cement. Experimental result showed that the setting time of slag cement was similar to that of Portland cement. The strengths were similar to that of Type III cement at
days but were higher at 28 days and further. Laboratory tests on concrete mix design and strength development for field application were performed and the field application into concrete overlay at 88 highway focused on the workability. strength development and applicability. The compressive and flexural strength of the concrete at 3 days were
, respectively, which indicated the possibility of opening the highway to traffic. Those strength of cored specimen at 28 days were
, respectively, Polypropylene fiber and steel fiber reinforced concretes restrained the shrinkage before saw cutting for joint in pavement, which were effective on thin bonded concrete overlay.
Analysis of Very Long Baseline Accuracy Using GPS Data of the IGS
Kang, Joon-Mook ; Park, Joung-Hyun ; Lee, Eun-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 293~293
Because very long baseline measurement systems like VLBI, SLR have problems for practical use, there have been many studies to determine very long baselines using GPS which have many advantages for observation and data processing. For evaluating the accuracy of very long baseline using GPS, we obtained GPS data of IGS sites in and around Korea and precise ephemerides from IGS Global data center via internet. With those data, we carried out data processing according to observation durations, ephemerides, and data solution methods. As the result of this study, the relative accuracy of
was deduced from two weeks observation data processing using precise ephemerides. In case of using precise ephemerides, its accuracy showed about 2 times better than that of broadcast ephemerides. This results can be used for the basic source for crustal movements study by GPS.
A Study on the Improvement of Classification Accuracy of LANDSAT TM Image by Canonical Correlation Classifier Using Clustering Analysis
Park, Min-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 301~301
The cluster analysis methods before canonical correlation classifier have been applied for the land cover classification for LANDSAT TM image. The effect of each method on the accuracy of the land cover classification has been analyzed. Sequential clustering and ISODATA(Iterative Self-Organizing Data Analysis Technique) clustering have been applied for the cluster analysis. The land cover maps from canonical correlation classifier, maximum likelihood classifier for each pixel and canonical correlation classifier for each cluster after cluster analysis have been compared, respectively. Conclusively canonical correlation classifier for each cluster after cluster analysis reduces classification errors caused by classification for each pixel, and improves classification accuracy. Also, the accuracy of canonical correlation classifier for each cluster after cluster analysis is a little better than that of maximum likelihood classifier. To reduce numbers of clusters and to classify the urban land and water, ISODATA clustering is more useful technique than sequential clustering.
A Study on the Real-Time Process of Close Range Photogrammetry Using CCD Camera
Yeu, Bock-Mo ; Lee, Suk-Kun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 317~317
In this study, For real-time data process of digital images, All the issues that are related to problem-domain are treated by Object Oriented Programming (OOP), not by procedural programming. Each procedure of digital photogrammetry is deluded as a class representing "user-defined data type" and constructed in hierarchy. Each module is built and embodied as digital photogrammetry systems. In data input procedure. a photo is converted as an digital image with extension in concept and feature and image I/O class is built. Then, CCD camera is used to capture digital images which are used as fundamental data of digital photogrammetry. The class is constructed to find out the characteristics of image distortion and to calibrate captured image. The image matching technique is implemented to captured image and the coordinate conversion class is used to find out three dimensional position. DLT and bundle adjustment are used to model the relationship between object in photo and its ground feature. And, the process to minimize error is implemented.
A Study on the Classification of Errors and the Development of an Error Detection Method in Digitized Map Data
Yeu, Bock-Mo ; Shin, Dong-Bin ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 329~329
The National Geographic Information System Project in Korea calls for the development of the National Digital Basemap database at the scale of 1 : 5,000. Assuring the quality of the National Digital Basemap is extremely important because these basemaps are one of the essential elements in developing GIS applications. In general, a standardized inspection process is required to maintain the quality of a large database. In addition, it is important to maintain complete and detailed records of the inspection results so that the records can be used to improve the quality assurance process. The goal of this study is to provide a typology of errors found in the digitized map inspection process and to develop a systematic quality assurance method for detecting and eliminating errors. The study result shows that a systematic method of applying automated inspection program, code inspection program and visual inspection, based on error type, has produced the maximum error detection. This study also provides a documentation procedure for the error inspection process that can be used as a reference for map updates and future application development.
Study on Construction Cost Saving of Pile Foundation Using Pile Load Test For Design
Chung, Sung-Gi ; Choi, Yong-Kyu ; Chung, Sung-Gyo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 341~341
design standard for structure foundation
prepared by the ministry of construction, it is recommended as the best way that ultimate pile capacity is determined in the static pile load test for design purpose. But, in real design of pile foundation, the presumptive design by the static bearing capacity equation is commonly being used. As a part of studies to improve the above-mentioned habitual designs of pile foundation design and generalize the design method of pile foundation utilizing static pile load test for design purpose, the foundations of two piers (p16 and p17) of the second Pusan Grand bridge were designed after performing the static pile load test for design purpose. Construction method for pile foundations was selected, construction specification and driving specification for pile foundations were determined. and, also, construction cost saving was researched, based on the results of the static pile load test with load transfer test for design purpose, which has not been made in the domestic construction work. It was expected that the drilled shaft foundations (1st choice) and the steel pipe pile foundation (2nd choice) designed by the static pile capacity equation were needed much more construction costs by at least 346% and 55%, respectively, than the steel pipe pile(3rd choice) designed by utilizing the static pile load test results for design purpose.
Prediction of Pore Pressure Dissipation Behavior from CPTU Dissipation Test Data
Lee, Seung-Rae ; Kim, Young-Sang ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 353~353
For normally consolidated clay, several researchers have developed a number of theoretical time factors to determine a coefficient of consolidation from piezocone test results. These researches are basically related to the distribution of initial excess pore pressures. However, the coefficient of consolidation determined by those methods not only make predicted dissipation curve matched to measured dissipation curve only at 50% degree of dissipation but also make it difficult to predict the excess pore pressure at high-degree of dissipation which is used to evaluate the degree of consolidation of in-situ site. Therefore, such methods have some troubles in predicting long-term behavior of soft soil by using a linear consolidation theory with their prediction of the coefficient of consolidation. Based on the previous results that the coefficient of consolidation could be reasonably estimated by the optimization technique, in this paper, we have tried to predict more realistic excess pore pressure at high degree of dissipation. Even though more researches are needed to apply the proposed method to the domestic construction sites, the results show that excess pore pressure at high degree of dissipation can be well predicted if the proposed method uses the dissipation curve data up to around 50% degree of dissipation.
A study on the Undrained Creep Properties of the Undisturbed Normally Consolidated Clays
Cho, Kyoung-Tae ; Lee, Seung-Hyun ; Jeong, Gyeong-Hwan ; Park, Sung-Zae ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 361~361
The purpose of this paper is to give a clearer view on the creep properties of clay related to its time-dependent behaviour. A marine clay, which may have the most typical creep behavior, is selected for this study. In particular, as the creep test is progressed the creep behaviour influenced by loading rates and stress levels is observed. After analyzing the relationship between the stress levels and the creep parameters obtained from the creep test results, reasonable soil parameters for numerical analysis are determined. These test results are verified by applying the creep equation of Singh and Mitchell.
A Study on Safe Blast Design with the Consideration of Blasting Induced Vibration in the Urban Area
Ahn, Myoung-Seog ; Park, Jong-Nam ; Bae, Sang-Gun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 373~373
A study was made on the design of the prediction model concerning blasting vibration in a construction site, Namgu, Daegu City. The geology in this area consists of hornfels of shale and mud underlain by quartzite, of which the main strike of the geological structure is in NW direction. Measurements were carried out on the top of the wall concrete water storage tank, which is buried in the ground earth. The attenuation due to the vertical wall of the concrete structure may be expected because of spherical divergency at the bottom comer of the wall by the Huygens principle. For design of blasting prediction model, thus among the values of vibration velocities for the same distance and charge weight, the linearity of large scaled distance (SD) may be preferable to use in the regression model, since they represent most likely the average ground condition. Judging from the regression results, the cube root method may be more suitable for this area. The SD values for the maximum allowable vibration velocity of 0.5 cm/s, in this area are 22.5, 28.0 and 30.6 for the significance level of 50%, 95% and 99%, repectively.
Modelling the Displacement Characteristics of Unbounded Soils by Using Orthogonal Polynomials
Lee, Seung-Rae ; Koh, Kwang-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 381~381
This paper presents a method for representing displacement characteristics for the analysis of problems in unbounded soil. In general, unbounded soil shows the displacement characteristics of
decay type. A series of orthogonal polynomials. which are composed of Laguerre polynomials and an exponential decay term, is suggested to be appropriate for
decay type which extends to infinity. An infinite element is developed by using shape functions based on the polynomial series. Numerical results are presented for a flexible axisymmetric disk footing rested on a homogeneous elastic half-space and excavated tunnels in homogeneous elastic infinite medium and half-space with initial stress fields. Compared with the analytical and other numerical solutions, the numerical results show the effectiveness of the proposed method.
Deformation Behavior of Pipe Buried in Weathered Soil Under Surface Load
Park, Jun-Boum ; Chung, Choong-Ki ; Kwon, Ho-Jin ; Choe, Myong-Jin ; Kim, Jun-Seop ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 391~391
Laboratory loading tests and numerical analyses using finite element method were performed to study the behavior of the buried FC pipes installed in weathered soil. The maximum loading was applied up to DB24 (
). Deformations and pressures developed on the pipes were mainly measured as differing the thickness of the soil, pavement conditions, bedding methods, and surface loads. Finite element method analysis was also performed to verify the behavior of the buried pipe under in situ installation conditions. Various loading conditions were applied for the clear understanding of the characteristics of the buried pipe in situ. Test results showed that less than one percent of the FC pipe diameter deformation was observed for various loading conditions with DB24 and
soil thickness. Finally, practical equations were developed for estimating the deformation of the FC pipe buried in weathered soil under surface load.
The Characteristics of Axial Bearing Capacity of Driven H-piles
Chun, Byung-Sik ; Cho, Chun-Whan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 403~403
The bearing capacity of driven H-pile can be characterized by driveability, time effect and plugging effect etc.; however the related research is not yet enough to apply to practice. H-pile including steel pipe pile and PHC pile were driven and tested at 3 locations for the purpose of the analysis of bearing characteristics. Dynamic pile load tests accompanied by static load test were carried out for the analysis. Test results indicated that H-pile had the best driveability, the least set-up effect among the 3 piles and that its plugging effect was higher than that of steel pipe pile. It was found out that it would be possible to increase the pile design capacity 1.9 times higher than a current design capacity of piles if the piles could be installed under an appropriate quality control. It was also found out that high strength H-pile was much more economical than ordinary grade H-pile. Comparison of the various bearing capacity calculation methods showed that Wave Equation Analysis of Piles(WEAP) was the most reliable method for the prediction of bearing capacity of H-pile.
Behavior of Soft Clay Ground Improved by Quick-Lime Pile
Kim, Chan-Kee ; Jeong, Jin-Seob ; Kim, Seung-Hui ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 415~415
The model strip footing test was performed to investigate in behavior of soft clay ground which was improved the model foundation area of 10 percentage using quicklime pile. In order to determine the soil parameters and numerical analysis of model ground by FEM, a series of isotropic compression and consolidated undrained conventional triaxial tests for the Iksan clay and quick-lime pile were performed. Also, The results of the test for soft clay model ground are compared with the results of the numerical solution, a modified Cam-clay model. developed by Roscoe et al. (1963) of Cambridge group, into FEM computer program.
A Study on the Grout Penetration into Rock Joints and Its Reinforcement Effect
Lee, Jun-Seok ; Bang, Chun-Seok ; Eom, Ju-Hwan ; Choe, Il-Yun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 425~425
The reinforcement effect of a permeation (or consolidation) grouting into the jointed rock masses is investigated using a concept of mechanics of composite material as well as ubiquitous joint model. The constitutive equation for a composite material made up of intact rock. vertical grouting and permeation grouting is derived and verified using idealized numerical examples. Derived anisotropic material properties are not only the functions of material properties of the intact rock and grout, but also related to the volume fraction of the grout and joint properties. It is found that, by applying typical material properties of sandstone, the average strain of the grout-reinforced rock masses undergoing a uniaxial compression is at least 10 times smaller than that of jointed rock masses. Future work will be focused on the mechanics of hydraulic fracturing and, therefore, fracturing grouting in which high injection pressure is involved.
Identification of a Water Proofing Membrane in Tunnel Lining by SASW (Spectral-Analysis-of-Surface-Waves) Method
Joh, Sung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 3_3, 1998, Pages 435~435
Recently, the construction of underground space due to its increased demand brought up interests in integrity testing techniques of a tunnel lining. The popular integrity testing method applied to construction quality control of tunnel structures, to long-term monitoring of existing tunnels and for examining the outcome of rehabilitation measures in tunnels includes infrared thermography, optical microcrack detection and GPR. The GPR, which is frequently used in Korea, detects reliably the thickness of a concrete lining and cavaties behind the second lining. However, when ground water is smeared behind the second lining, or a void exists behind a steel support, the integrity testing using GPR falls into difficulty. SASW method is not affected by water and materials with high conductivity and dielectric constant, and evaluates a shear stiffness profile. This study developed a new non-destructive integrity testing method for a tunnel lining, which is based on the SASW method and is specially for the purpose of checking whether a water proofing membrane exists or not and detecting how deep the water proofing membrane is located.