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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 19, Issue 3_6 - Nov 1999
Volume 19, Issue 2_6 - Nov 1999
Volume 19, Issue 1_6 - Nov 1999
Volume 19, Issue 3_5 - Sep 1999
Volume 19, Issue 2_5 - Sep 1999
Volume 19, Issue 1_5 - Sep 1999
Volume 19, Issue 3_4 - Jul 1999
Volume 19, Issue 2_4 - Jul 1999
Volume 19, Issue 1_4 - Jul 1999
Volume 19, Issue 3_3 - May 1999
Volume 19, Issue 2_3 - May 1999
Volume 19, Issue 1_3 - May 1999
Volume 19, Issue 3_2 - Mar 1999
Volume 19, Issue 2_2 - Mar 1999
Volume 19, Issue 1_2 - Mar 1999
Volume 19, Issue 3_1 - Jan 1999
Volume 19, Issue 2_1 - Jan 1999
Volume 19, Issue 1_1 - Jan 1999
Selecting the target year
An Analysis of Highway Traffic Flow using 3-Regime Model
Lee, Eui-Eun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 851~851
In this paper, more accurate interrelationships among the basic highway traffic flow variables such as speed, flow-rate, concentration (occupancy) are investigated. The selection of appropriate traffic model is a complex task requiring analysis of trade-offs between simplicity and clarity. In recent years, as more increased is computing capability, as more weighted is clarity. and previous papers by Hurdle and Datta, Hall concerned with the deficiencies of traditional traffic flow models. So, in this paper, We collected many (28 stations located in freeway near seoul) real-time data sets and reduced, validated these. and presented an investigation of various models and compared results. In conclusion, 3-regime model may be superior to traditional models in clarity and this model may be used as a tool developing congestion threshold and estimating queue length in freeway.
The study on the Problem Analysis by Before/After Evaluation of Traffic Calming Planning
Kum, Ki-Jung ; Park, Min-Ho ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 863~863
The Traffic Calming Planning is enforcing that is center of each self-governing district of seoul city. In 1998, regardless of project plan was established/enforced that target of 110 zone problem of propulsion, different opinion in concerned post, inertia of development valuation after project enforcement, transmutation of project's initial object that indication is presenting that need to reconsider of this project. Therefore in this study, compare/analyze Traffic Calming Planning through before-after valuation and analyze problems according to promote of Traffic Calming Planning.
A Study on Behavior of Rubber-Modified Asphalts
Kim, Nam-Ho ; Park, Yong-Chuel ; Hwang, Sung-Do ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 873~873
This study presented the behavior of nine asphalts that were produced in five major Korean refineries. Two asphalt modifiers (type R and S) which were frequently used in Korea were added to investigate the level of performance and the effectiveness. As a conventional asphalt property, asphalt penetration, ring and ball (R&B) softening point, and asphalt viscosity were measured. Also Dynamic Shear Rheometer (DSR) were used to evaluate viscoelastic properties of asphalts in the
temperature range. These properties before and after the short-term (RTFO) and long-term (PAV) aging were compared and analyzed to achieve the research objectives. The conclusions from this study can be summarized as follows: Use of asphalt modifier (type R and S) induced a significant improvement on rheological behavior of Korean asphalt at high temperature. At intermediate temperature, the asphalt modifiers mayor may not induce a improvement depending on the type of asphalt modifier. And at low temperature, the asphalt modifiers do not affect rheological behavior.
Evaluation of Layer Properties and Reaction Capacity of Roller Compacted Lean Concrete Base
Eum, Joo-Yong ; Yoo, Tae-Seok ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 887~887
The roller compacted lean concrete bases with slag cement and thinner sections were evaluated. Three types of cement as ordinary portland cement, slag cement 30% and slag cement 45% were applied into three types of thicknesses; 15cm, 12cm, and 10cm. In laboratory tests, strength development for each cement were measured and slag cement 30% concrete was similar to that of ordinary portland cement concrete, however lower strength was developed in slag cement 45% concrete. Sensitivity analysis based on AASHTO design equation and field application were performed to investigate the effect of 6 types of variables. According to sensitivity analysis, pavement lives increased as the modulus of elasticity and thickness of base increased, but section efficiency decreased. From the results of density test and back analysis from FWD tests on field sections, thinner sections of 12cm, 10cm showed the increase of modulus of elasticity and density. The bearing capacity and load transfer of 12cm sections showed better results than those of other sections. Sections of slag cement 30% have better bearing capacity and load transfer than those of ordinary portland cement. But sections of 10cm thickness tend to be relatively poor uniformity and those of slag cement 45% exhibit lower initial strength.
Development of a Mechanistic Fatigue Prediction Model of Asphalt Mixtures
Lee, Hyun-Jong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 897~897
This paper presents a fatigue performance prediction model of asphalt concrete that is developed based on the elastic-viscoelastic correspondence principle and the work potential theory. The fatigue model has a form similar to the phenomenological tensile strain-based fatigue model except that all the regression coefficients in the phenomenological model are expressed in terms of the materials viscoelastic properties, loading conditions, and damage characteristics in the new fatigue model. The experimental study on seven different asphalt mixtures including both conventional and modified asphalt mixtures demonstrates that the slope of the linear portion of creep compliance-time curve in logarithmic scale is well correlated with the fatigue lives of the mixtures. In the validation study, the fatigue model successfully predicts the fatigue lives of the various asphalt mixtures. A computer program FATIGUE.VI that is developed for the data acquisition and fatigue characterization of asphalt mixtures is briefly introduced.
The Analysis of Three Dimensional Positioning by the Combination of Sensors
Yeu, Bock-Mo ; Choi, Song-Wook ; Kim, Gi-Hong ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 911~911
At present, the digital mapping of our country is processed by the government. Though the accuracy of digital map is high at first, the positional and attribute information changes of topography and artificial structure must be updated rapidly for the efficient applications as the time goes on. Under this condition, the mobile surveying system that acquires the positional and image information of objects rapidly is needed to construct. In this study, the algorithm of three dimensional positioning by the combination of three sensors is defined. The ground coordinates of objects are determined using the static and dynamic images along the van carried with CCD cameras, GPS receivers and Inertial Measurement Unit is moving. At the same time of image acquisition, the ground coordinates of objects are converted into the three dimensional local coordinates using the three dimensional absolute coordinates by GPS and the pitch and roll angles by IMU and the accuracy of positioning is analyzed. The correlations of errors are provided by the regression analysis.
A Study on the Application of the Iterative Orthoimage Refinement for the Correction of DEM
Yeu, Bok-Mo ; Lee, Yong-Woong ; Koh, Jin-Woo ; Cho, Bong-Whan ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 925~925
In this paper the application of the iterative orthoimage refinement(IOR) to correct and evaluate DEM generated by digital correlation method will be discussed. Because image matching errors may occur in the area of linear boundary, steep terrain, and bad correlation property on digital correlation method, the digitally generated DEM will be necessary additional editing processes. If a stereo pair has an exact exterior orientation parameters, the errors extracted from DEM will make geometrical matching error between the scenes. Therefore, it will be possible to refine the DEM by correcting matching errors. Experimental development of the IOR concept was applied on SPOT-P image to investigate its applicability in order to improve the DEM. Experimental result showed the IOR methodology can be applied on the DEM from optical satellite image to verify the accuracy and generation of precise output.
Correlation Analysis between the Multivariate Conditional Probability and the Classification Accuracy in Satellite Image Classification
Eo, Yang-Dam ; Kim, Chang-Jae ; Kim, Yong-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 935~935
In order to improve the classification accuracy, it is required to optimize pre-classification stage which determines classification parameters rather than to develop classifiers alone. In this study, the class separability of training is calculated at a pre-classification stage using SPOT XS and LANDSAT TM. The correlation between classification accuracy and the class separability is analyzed. In order to get a method which select more effective class combination and band combination than existing methods, the correlation between classification accuracy and the conditional probability of pixel distribution from training parameters is calculated. The results showed that class separability measurements by multivariate conditional probability have much higher correlation with actual classification accuracy than other existing methods.
A Study on enhancement of Traffic Flow Information System in Car Navigation System
Yeu, Bock-Mo ; Joo, Hyun-Seung ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 949~949
Car Navigation System is one of the applied fields of Geo-spatial Information System which continuously provides the road information to a driver. Because currently developed and commercially used CNS provides only a shortest road distance, compounded and various information such as the condition and complexity of the road, impassibility due to constructing, inundation of stream, occurrence of an occasion and etc. cannot be provided. In this study, traffic flow information system can present the usage of traffic images from Autoscope system which uses CCTV cameras, analysed traffic flow cases which are transformed to CNS in the car. Using these data, the driver can choose more smooth route without traffic congestion. This system also provides the information of the most smooth route not to shortest distance, and it is understood to control the traffic system to relieve traffic congestion and induce the smooth traffic condition.
Interpretation of Error Propagation of Digital Cadastal Map Using Geo-Spatial Information System
Yeu, Bock-Mo ; Kim, Gab-Jin ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 955~955
Digital cadastral records which is used in Land Information System is stored in the form of data layer within the system after transferring text formatted input into the data having topology. Provided that the accuracy of constructed data layer is guaranteed by error verification, various spatial analysis can be performed. In this study, in advance the verification of software package for Geo-Spatial Information System is carried out on purpose of analysing the error sources of spatial data caused in the process of making cadastral records into digital form. Thus, when transferring digital cadastral records into data with topology, errors between input and output is eliminated after forming topological relation using double precision. Through the verification of digital cadastral records, the error only exist on the node which have erroneous coordinate including typing mistake in the system. The errors on those nodes can be eliminated by constructing topological structure, so it is clear that the errors would not be propagated into other nodes.
The Effect of Electrolyte Concentration on Electro-Osmotic Consolidation
Kim, Soo-Sam ; Han, Sang-Jae ; Kang, Min-Soo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 965~965
The parameters affecting electro-osmotic process are level of voltages, concentration and type of electrolytes, types of soil, material and spacing of electrodes, pH, and so on. In this paper, the effect of electrolyte concentration was examined to observe the applicability of electro osmosis on soft soil with various concentration of salt. NaCl, which is the most abundant substance in the sea water, was selected as an electrolyte for the laboratory test and the concentration of pore water was varied in 0, 0.01, 0.1, 1 Mole. The results showed that the measured electro osmotic permeability for the concentration of
lower than cation exchange capacity(CEC), approaches to the values proposed many other researchers while it reduced rapidly for the concentration higher than CEC. As NaCl concentration increased, electric current for the test is increased and the high level of energy consumption is expected. Therefore, the use of electro-osmotic soil improvement would not be efficient from the economical point of view at the site where the NaCl concentration is high e.g. seashore reclamation site.
Study on the Interaction of Soil-nail by In-situ Pull-out Test
Lee, Song ; Lee, Yong-Won ; Yi, Chang-Tok ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 975~975
Soil nailing is in-situ ground improvement technique of reinforcing soils using passive inclusions for the purpose of slope stability or provision of flexible retaining system. Soil nailing is on the increase in the application case related to temporary retaining wall. But particular regulations about nail analysis as well as design and construction experience for soil nailing is not enough and nail design is depending on entirely existing design method with little thought of soil-nail skin friction in the most important reinforcement system of soil nailing. Therefore, this paper presented the deformation characteristics of reinforced soil using systematic in-situ pullout test. Finite element analysis were carried out using geotechnical engineering program
to simulate the pull-out tests and understand behavior of reinforced soil. This analysis has enabled to describe the interaction and friction characteristics between the soil and the nail.
Experimental Study on the Estimation of Volume Change for Dredged Clay
Lee, Song ; Lee, Kyu-Hwan ; Shim, Min-Bo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 985~985
This paper was performed by test apparatus greater than a general measuring cylinder in a laboratory to suggest the characteristics of sedimentation and consolidation of a dredged clay. This paper describes Yano method which is most used to estimate the ratio of volume change for a actual reclamation area. Also, from the results of the test, this paper shows the problem of Yano method for the determining of the starting point of self-weight consolidation as compared with the method of Lin and Lohnes. Generally, dredged clay is reclaimed as the condition of the water content with 1000% around the opening of soil discharge, the reclamation works with a low water content are sometimes performed due to the development of reclamation capacity. Further, the reclamation with a low water content will be performed in earnest, so that the major purpose of this paper is to suggest the problem for the estimation of volume change using Yano method at a low water content.
Infiltration Characteristics of Unsaturated Decomposed Soils
Kim, Sang-Kyu ; Ryu, Chi-Hyob ; Kim, Dong-Hyon ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 995~995
This paper aims to study the infiltration characteristics of the precipitation to unsaturated decomposed soils. A soil column apparatus, which can measure water contents (using gypsum block), matric suction (using tensiometer), and positive pore water pressure (using manometer) was made, and a series of the tests were carried out with constant water head (h = 5mm) on the surface of the column. The test results indicated that, according to the advance of the wetting front, a degree of saturation of the soil steeply increased but the soil was just
saturated along with the depth except to 100% saturation of the surface of the column. It was observed that Air bubbles within the pore spaces in soil were moved with the advance of the wetting front. If much time had elapsed, positive pore water pressure was not developed to the surface of the column at the lower part of the column because of the effect of air bubbles.
Evaluation of Lade Constitutive Model for Compacted Decomposed Granite Soil
Kang, Byung-Sun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 1003~1003
Nine simple stress paths and two complex stress paths are tested to predict the stress-strain relationship on compacted decomposed granite soils. The test results are compared with the Lade's two model, one with a single work-hardening model and the other with two intersecting yield surfaces. The measured strains for the most stress paths - increasing stress level, propotional stress path and reloading stress path - are good agreement with Lade's double work-harding model, only but the axial strains for decreasing stress level are reasonably agreement for Lade's single work-hardening model. The volumetric strains in most stress paths compare very favorable with double work-hardening model. Also the strains induced by complex stress-paths are generally agreement with double work-hardening model. This means that the double work-hardening model shows good predict the stress-strain behavior of decomposed granite soil despite of complicating that this model must analysis the two yield surface, plastic expensive strains and plastic collapse strains, even through the single work-hardening model is convenient to be presented by one yield surface.
Adoptability of Double Hardening Constitutive Model for Compacted Decomposed Granite Soil
Kang, Byung-Sun ; Yang, Jae-Hyouk ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 1013~1013
The nature of stress path dependency, the principle that governs deformations in compacted decomposed granite soil, and the use of Lade's double work-hardening model for predicting soil response for a variety of stress paths have been investigated, and are examined. The test results and the analyses presented show that under some conditions compacted decomposed granite soil exhibit stress path dependent behavior. nine simple stress paths and two complex stress paths are tested using conventional triaxial compression test. The axial strains calculated from Lade's double work-hardening model are in reasonable agreement with those measured, and the volume strain agrees very well althrough high stress level is slightly underestimated. It is known that stress behavior under constant stress level is only occured elastic strain. In reality, however, plastic strain is occured. For stress paths involving unloading or reloading, the stress path with the higher average stress level produces the larger strains, whereas all stress paths having the same intial states of stress, and involving only primary loading conditions, produce strains of similar magnitudes.
Propagation and Attenuation Characteristics of Various Ground Vibrations
Kim, Dong-Soo ; Lee, Jin-Sun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 1021~1021
In order to control the vibration related problems, it is necessary to investigate the propagation and attenuation characteristics of vibration. In this study, these characteristics were studied by measuring the various ground vibrations induced by train loading, blasting, friction pile driving, and hydraulic hammer compaction. Based on these measurements, dominant frequency range, type of generated vibration, attenuation characteristics were assessed. Attenuation characteristics measured in the field matched well with the predicted characteristics using the geometric damping coefficient proposed in this study and material damping coefficient of the site. This shows the feasibility of using these suggested propagation and attenuation characteristics in the real vibration prediction problems.
Extraction of Volatile Organic Compounds Using Surfactants from the Contaminated Soil
Kim, Jae-Young ; Park, Jun-Boum ; Oh, Dong-Ik ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 3_5, 1999, Pages 1033~1033
Sorption isotherm tests and successive reverse isotherm tests using Kimpo Sudokwon landfill soil were conducted (1) to understand the sorption behavior of volatile organic compounds onto a soil; (2) to investigate the volatile organic compound (VOC) extraction efficiencies of surfactants; and (3) to evaluate the field application of surfactant extraction technology. Benzene, ethylbenzene, toluene, trichloroethylene, o-xylene, and p-xylene were selected as the target compounds. Three nonionic surfactants, i.e., Brij 30, Triton X-100, and Tween 20 and anionic, DowFax were used for tests. The sorption of the VOCs tested in this study onto the soil reached equilibrium in 72 hours. The VOC extraction efficiencies of surf act ants from the VOC contaminated soil specimens was higher than those of distilled water. When the dosage of surfactant was two times of CMC, the VOC extraction efficiency was the greatest among the dosages tested. DowFax which contains two-head group showed much higher VOC extraction efficiency than the other tested nonionic surfactants.