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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
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
Joint Models of Commuter's Mode Choice and Travel Behavior after Work Activity - A Case of Seoul City -
Lee, Dong-Kyu ; Choi, Yun-Suk ; Oh, Ju-Sam ; Chung, Jin-Hyuk ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 1~9
This paper presents a joint model, which captures relationships among commuters' socio-demographics, activity participation (i.e., time use) and travel behavior after works using data collected in Seoul, 1997. The research reported here shows that complex and strong relationships among the endogenous variables and exogenous variables are properly explained. From Structural Equation Models developed in this study, we can conclude that time-use after work significantly effected by work-related activity participation. Also, activity participation after work can be explained by several exogenous variables such as mode taken in their commuting trips, age, gender, income and so forth. This study may contribute to understand the travel behavior of commuters.
ITS Policy Direction and Strategy Based on Foreign ITS Studies
Bae, Sang-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 11~18
Intelligent Transport Systems (ITS) was first introduced in Korea early nineties. Since then, Korean government, specifically, Ministry of Construction and Transportation (MOCT), puts lots of efforts for flourishing it to the entire nation. Although review of the current status of well-developed ITS countries were documented through various projects, profound and state-of-the-art study was not researched. It leads to weakening the validity of ITS, and gives negative impact on ITS in many aspects in Korea. This paper, therefore, aims to identify Korea's direction of ITS based upon the-state-of-the-art literature survey of foreign cases. This research will give a good justification for ITS office in MOCT to expand ITS to the nation.
Estimation of Design Hourly Factor using AADT of National Highway Roads
Lim, Sung-Han ; Kim, Yun-Seob ; Byun, Sang-Cheol ; Oh, Ju-Sam ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 19~26
This paper deals with the estimation of design hourly factor(K) using AADT of national highway roads. Its objective is to estimate optimal K of national highway roads. This study classifies the national highway roads in Korea by the number of lane and level of service, and develops the K estimation models using regression analysis. Optimal models are as followings. (1) Two-lane roads : Exponential model for LOS A and S model for LOS
. (2) Four-lane roads: Exponential model for LOS
, Power model for LOS C and S model for LOS D. Optimal K for LOS D which is design criteria of national highway road is 0.135(
) for two-lane roads and 0.090(
) for four-lane roads. It is smaller than those of KHCM.
Modeling Traffic Accident by Taxi Drivers through Overdispersion Test
Jang, Tae-Youn ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 27~34
This study has the research purpose for establishing model considering overdispersion appeared frequently in count data and applies the model into traffic accidents by taxi drivers. The model usually used in current research on count data is based on linear regression analysis because of its simple concept and easy usage. But linear regression model has the following shortcoming; unreflection of non-negative integer characteristics in count data, unreliability of forecasting results, and not offering of discrete probability on traffic accident frequencies. The model appropriate for analyzing count data is poisson regression model. However, poission regression model is based on the concept that expected mean of distribution is equal to variance. The most count data has variance greater than mean, which results in underestimating standard error. In study, overdispersion test is used to estimate the degree of statistical difference between mean and variance. The result of test proves that negative binomial regression model rather than poisson regression model well reflects traffic accident frequencies of taxi drivers in this study. Likelihood ratio test and Theil's inequality coefficient test are applied for the validity of variables and for accuracy of estimating model.
Laboratory Performance Evaluation of SBS Modified Stone Mastic Asphalt Mixes
Lee, Hyun-Jong ; Kim, Hyun-Jun ; Ock, Chang-Kwon ; Kim, Hyung-Bae ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 35~41
In general, unmodified asphalt binder and cellulose fiber are used in SMA mixes in Korea. To increase the performance of the SMA mixes, it seems to be necessary to use modified asphalt binders. In this study, the laboratory performance of SBS modified SMA mixes instead of using conventional asphalt binder was evaluated. Uniaxial tensile fatigue test results reveal that the SBS modified SMA mixes have almost ten times longer fatigue lives than the conventional SMA mixes. Wheel tracking test results, which was conducted to evaluate the rutting resistance of mixes, show that the dynamic stability values of the modified SMA mixes are three times higher than those of the conventional ones. In addition, both adhesive tensile strength and low temperature bending strength values of the SBS modified SMA mixes are higher than those of the conventional ones by
, respectively. According to the moisture damage tests, the modified SMA mixes satisfy the mix design criteria while the conventional SMA mixes do not satisfy the criteria. Overall, the SBS modified SMA mixes show better laboratory performance than the conventional SMA mixes.
Change of Tensile Properties and
of Asphalt Concretes due to Aging
Kim, Kwang-Woo ; Doh, Young-Soo ; Kim, Sung-Un ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 43~52
Asphalt mixture characteristics are changed due to aging of binder. Since asphalt mixture becomes stiffer due to age hardening of binder, mechanical properties of asphalt concrete are also a function of binder characteristics. However, the correlation of mixture's mechanical property with asphalt property is not well known and there is limited study which is dealing with this topic. This study dealt with evaluation of mixture's mechanical properties after short-term and long-term aging of asphalt mixture. Two asphalts, two aggregates, two gradations and four polymers were used to make 32 mixture combinations. The mixtures were prepared and aged artificially in a forced draft oven. The mechanical property included resilient modulus, indirect tensile strength and stiffness index. Statistical analyses were carried out to find out the factor(s) having a significant effect on change of mechanical properties of asphalt mixture in aging. In general, three mechanical properties increased by aging, with dense mixture showing higher increase than gap-graded mixture. Rosin showed the highest strength values after aging, which is an evidence of the aging susceptible nature. A relatively high correlation was found from indirect tensile strength with stiffness index and lower correlation between ITS and
Construction of New Penetration Grading for Asphalt Binders
Huh, Jung-Do ; Hwang, Sung-Do ; Choi, Han-Kil ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 53~60
Major critics of the present penetration grading often point to the empirical method and the absence of temperature dependency. To resolve these critics, a better penetration grading is suggested at the first time in this study. This grading is proposed on the basis of the new theory, that is developed by applying the relationship between pavement rut depth and binder penetration, the relationship between penetration and test variables(temperature, weight, etc.), and the time-temperature superposition principle. Since this theory requires a reference binder, it is determined as the one which passes the rut-stability criterion in the wheel tracking experiment. The selection of reference binder and the new grading theory allow one to grade all domestically used binders and to analyse how the new grading is different from the present one. A substantial difference between the two is found as the result of such analysis.
Damage Behavior of Asphalt Mixes due to Rutting
Huh, Jung-Do ; Choo, Sang-Hyuk ; Choi, Han-Kil ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 61~67
It is phenomenologically explained that rutting involves material damage as same as the fatigue cracking in asphalt pavements. Rut depth is known to develop rapidly, once the damage starts to progress. In this case, a new rutting equation is required and suggested first time here by adding the expression of the damage deformation to the existing empirical one. The data of the laboratory wheel tracking experiment as a function of wheel speed prove that the suggested equation is reasonable, and the material damage turns out to be a function of wheel speed. Through this equation, the new analytical method to analyse the damage behavior due to rutting is also developed. It is explained that the Hamburg wheel tracking test accelerates the damage initiation, and the data obtained by this test disclose the damage behaviors affected by temperature and viscosity of pavement materials.
Methodology for a Cost Estimating on the Project of a Composite Facility
Park, Jong-Hyun ; Lee, Tai-Sik ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 69~78
The problem of cost overrun, especially in the construction industry, is a global one. There are many sources of occurrence the project cost overruns. Inflation affect to rising costs of a project largely. Although the causes of project cost overrun are well known, the methodology used in handling its evaluation, especially on those aspects relating to price variation, is very inadequate. Most of cost models use a unit cost index to account for the inflation. The construction project that has similar work content, like building construction project, is useful to adopt a composite cost index for adjusting the cost of project. However, the project that is comprised of many facilities has different work contents each facility. If a composite cost index is used to the project, highly accuracy in estimating the project colt can not be warranted. Therefore, this research is aimed at developing a suitable cost estimating model by using elemental work indices for the project that consisted of multi facilities work. This model has been used successfully in cost estimating of four state-owned road projects. It is expected that the model could be effectively used for other parts of civil work.
Research of Satisfaction about Training Engineering Manpower - Focused on University Education -
Lee, Tai-Sik ; Bae, Keon ; Lim, Sung-Young ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 79~88
Professional engineers become the core of holding nation's competitive power in the 21th century, information and technology society called digital period. Especially, technologies change rapidly due to the development of information technology, and the need of knowledge to learn and use the new technique is increased, so training professionals and role of them are emphasized. In spite of those needs, domestic university's education is focused on the theory which is far from a construction field that lead to the lack of the professionals whom the construction industry needs. This study shows satisfaction of university education by making questionnaire about engineering education in university to cope with the situation rapidly changing due to the development of the science and technology.
Experimental Study on Reduce Amounts of Rebound in Wet Pocess Shotcrete Works
Jeon, Jun-Tai ; Lee, Yang-Kyoo ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 89~95
The aim of shotcrete is to increase the bearing capacity and to protect the excavated surface from erosion by preventing felling of rock mass. Shotcreting method is divided into two types as dry process and wet process. Since 1997, wet process method has been used more frequently than dry process method in field works. The failure to bond, so called rebound, occurs in many case during shotcrete works. The excess amount of rebound has a significant effect on the total construction cost. For example, material and craft-man cost increases, the shooting time delays due to deceleration of work execution stage, work efficiency of craft-man decreases and additional cost to remove the muck generates. In this study, therefore, the experimental analysis of rebound amount and strength was conducted by analyzing the actual construction data for wet process type of shotcreting method. Also, the effective and rational method was suggested, which can be readily implemented in the Korea construction sites.
Behavior of the Track Structure Subjected to Thermal Load
Lim, Nam-Hyoung ; Kang, Young-Jong ; Sung, Ik-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 97~105
The actual behavior of the railroad track structure is suspected to be a complex interaction between the vertical, lateral, longitudinal, and torsional behaviors. A FE program are developed in the present study to be used for extensive nonlinear analysis of the track structures subjected to thermal load. Using the rigorous study on the deformed shape of the rail and tie, and stress resultants, characteristics of the three dimensional behavior are investigated. It is found that the flexural rigidity of the tie and the rotational stiffness of pad-fastener can be affect the behavior of the track structure and the post-buckling behavior in each rail, except lateral behavior, is not same.
A Study on the Classification of Land Cover Using LiDAR Intensity and DSM Data
Han, Soo-Hee ; Kim, Yong-Il ; Yu, Ki-Yun ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 107~114
LiDAR(Light Detection And Ranging) provides intensity data which reflects characteristics of the materials. In this study, we adopted LiDAR intensity data, instead of multi-spectral images which are generally used for land cover classification, and DSM data which was generated from LiDAR. We integrated data with intensity and DSM then it was classified into five classes - "asphalt road, grass, concrete road(pavement), building roof, and tree." Separability and accuracy of classification were evaluated. In addition, a method of processing intensity and DSM data was proposed in order to improve separablity. From this study, it was confirmed that LiDAR intensity reflects characteristics of the materials, thus it can be used for classification data.
The 3-D Positioning by Generation of the Rational Function Model Coefficients from IKONOS Satellite Image
Lee, Hyo-Sung ; Lee, Jae-Bin ; Kim, Yong-Il ; Yu, Ki-Yun ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 115~121
This paper presents on generating coefficients of the RFM(Rational Function Model) using GEO-level stereo images of urban area acquired from the IKONOS satellite, and analyzing the fitting error of this model on the test field. As results, the maximum error of image coordinates acquired by the forward transform of the nm did not exceed 9 pixels, and the maximum error of ground coordinates by the inverse transform of the RFM did not exceed 8m.
Determination of Ground Coordinates Using IKONOS RPC
Na, Jae-Hong ; Cho, Woo-Sug ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 123~129
In recent years, high resolution satellite images have emerged in the field of geospatial community. It could be said that the IKONOS-2 image of Space Imaging Corporation is the first commercial high resolution satellite image. While most of earth observation satellites provide the orbital data for sensor model, IKONOS satellite generates a series of coefficients called RPC (Rational Polynomial Coefficients) of RFM(Rational Function Model) for sensor geometry. It is well known that RFM is the image transfer standard suggested by OGC (Open GIS Consortium). Since RFM is rather new mathematical model, there have not been much of research works on 3D positioning through RFM. In the study, a basic algorithm of three dimensional positioning using RPC of IKONOS image was proposed and analyzed. The 3D coordinates determined by the proposed method were compared with those of commercialized software, Intergraph SSK Pro.
The Discontinuities Analysis of Rock Slope by Digital Photogrammetry
Kang, Joon-Mook ; Um, Dae-Yong ; Choi, Joon-Seog ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 1D, 2003, Pages 131~137
This study is to present the possibility of application of digital photogrammetry for monitoring, safety assessment for rock slope, and offering base data for collapse countermeasure draft. The discontinuity line structure of rock that was represented to joint was extracted and analyzed measurement accuracy for this, and created discontinuity line structure vector map for whole object rock slope using 3-dimensional data acquired by digital photogrammetry. Result of this research will be useful for systematic investigation, estimation, and countermeasure draft of rock slope. Also, it is expected to contribute to the safety of investigators, the degree of measurement accuracy and the improvement of investigation objectivity by comparing to previous slope research method.