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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 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
A Study on the Effective Factors of Following Vehicle Sensitivity using GPS Received Data
Kim, Jae-Seok ; Lim, Chae-Moon ; Woo, Yong-Han ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 139~145
The purpose of this study is to reveal the variery and magnitude of effective factors on following vehicle's sensitivity in the saturation flow. According to leading vehicle's speed, the following vehicle's driver determine the speed and sustain the optimal spacing, and then the following vehicle responds in a short time at the time of leading vehicle's acceleration or deceleration. The sensitivity means the rate of response presented by magnitude of stimulus. Sensitivity can be briefly described as reaction time, but in real situation, it's decided by various factors reacted between two vehicles. The main factors could be the speed, spacing, acceleration, deceleration, and so on. This study accumulated these factors by on-line GPS data. From the result of this study, when it is actually measured, the real clearance has the most serious effect on sensitivity, and when the following vehicle sustains safety clearance, the leading vehicle's deceleration has the most serious effect on sensitivity.
Estimation of Vehicle Loading Rates for Commodity based Models based on Urban and Regional Truck Trip Characteristics
Choi, Chang-Ho ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 147~158
The freight demand estimation is used to follow four step forecasting process: freight generation, freight distribution, mode choice, and traffic distribution. There have been many attempts to estimate freight demand in korea, but only a few study were done for vehicle loading rates which connect mode choice to traffic distribution. Vehicle loading rates present transporting weight compared to vehicle capacity, so accurate loading rates are necessity for adequate traffic distribution process. This study estimate loading rates using the first commodity flow survey in 1997 which is the only raw data can be used now. The data are selected in case only truck use because of data constraint, and classified according to spatial distributions into urban and regional traffic. The principal aims of this study examine the following issues: (a) vehicle loading rates are differ from between urban and regional traffic, (b) the necessity of application of different vehicle loading rates for urban and regional traffic respectively in commodity based models, and (c) the correction rates to compensate vacant vehicle trips in traffic distribution.
Application of Yield Management Problem to Korean National Railroad with Passenger Reservation Characteristics
Lee, Ho ; Suh, Sun-Duck ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 159~165
Service industry dealing with perishable goods, such as airline, hotel, rental car, etc, employ yield management to maximize revenue. The purpose of this research is to develope three yield management models and apply to Korean National Railroad(KNR). Models considerable were a deterministic linear programming model, a probabilistic nonlinear programming model, and a deterministic linear programming model with cancellation. Case studies were carried out using simulated ticket reservation purchasing scenarios. The ticket purchasing scenarios were developed with passenger characteristics analyzed with one-year ticket sales records. Various reservation sales polices were tested. A policy which favors long distance over short distance trips can accomplish about 4% increase in revenue. Employing different fare which favors early reservation also showed positive result of 2%. Imposed cancellations fees showed small improvement in revenue. Based on these findings, employment of yield management to KNR is proposed.
A Study on the Offset Influence of Wheel Position in Flexible Pavement
Choi, Jun-Seong ; Shin, Dae-Young ; Kim, Soo-Il ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 167~177
Regulations limit the width of pavement to
meters due to consideration of design velocity, traffic volume, topography and limit the maximum width of the vehicle to 2.5 meters. The wheels of vehicle pass irregular route on a pavement, and the different positions of the wheel influence the behavior of pavement. For evaluation of asphalt concrete pavement behavior under various wheel positions, ABAQUS, a three-dimensional dynamic finite element program (3D-DFEM), is used. According to the offset distance of moving load, interior depth deflections of the flexible pavement behavior with various elastic moduli and thickness of pavement is analyzed numerically. Three-layered system with asphalt concrete, subbase and subgrade layers was used in this study. Totally 81 sections which represent thick, middle, thin thickness and high, medium, low elastic modulus were established. To evaluate the relations between wheel position and maximum deflection, maximum deflection reduction ratio is developed through the regression analysis. From the parameter study, it is found that maximum deflection reduction ratio is sensitive to elastic moduli and thickness of pavement. The proposed equation in this study is verified from Multi-Depth Deflectometer (MDD) test results.
A Study on the Effect of Division of FWD Loading Plate on Pavement Analysis
Choi, Jun-Seong ; Choi, Sung-Rock ; Kim, Soo-Il ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 179~190
Falling Weight Deflectometer (FWD) data have been analyzed with the layered elastic analysis. However, the layered elastic analysis can not consider the effect of division of FWD loading plate. In this study, the effect of division of FWD loading plate is studied numerically and the equation for predicting equivalent uniform load that reflects the effect of division of FWD loading plate to the layered elastic analysis is proposed. The contact pressures under the divided FWD loading plate are studied with ABAQUS, a three-dimensional finite element program, and verified with the FWD field test data. The contact pressures from the FEM analysis considering the effect of division of FWD loading plate and from the layered elastic analysis not considering the effect of division of FWD loading plate are compared. Based on the comparision, it is found that significant errors are generated when the layered elastic analysis is used. The FEM analyses are performed for a given range of layer elastic moduli and thicknesses to choose a effective parameter on the contact pressure. From the parameter study, it is identified that the contact pressure is sensitive to the thickness of asphalt layer. At every thickness of asphalt layer, the equivalent uniform load is evaluated by comparing the FWD deflection from layered elastic analysis to that from FEM analysis. The regression analysis equation between the equivalent uniform load and the thickness of asphalt layer is established. Validity and applicability of the proposed equation are verified by analysing the FWD field test data and the Multi-Depth Deflectometer (MDB) test data.
A Study on the Characteristics of the Laboratory Test by PI(Plastic Index) Values of Granular Materials
Cho, Gyu-Tae ; Nam, Young-Kug ; Rhee, Suk-Keun ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 191~200
The pavement construction used to granular materials of natural materials, such as the gravel. But In 1990s, these were substituted for the crushed stone be cause by the shortage of the gravel. However, the granular materials mingled with the clayey soil in the process of substitution. The mixed clayey soil affect the mechanical characteristics and the characteristics of freezing. Laboratory tests consist of compaction test, CBR test, permeability test, and freezing & thawing test, to examine the mechanical and freezing characteristics. The clay contents of specimen were varied as 10%, 20% by the weight of granular materials. Estimate of CBR test results presented empirical relationship between the unsaturated CBR and modified CBR. The results of test were carefully analyzed for the effect of clay contents in the granular materials. The value of the CBR indicated to increase the plastic index and the clay contents. According to increase the clay contents. In the E compaction, the coefficient of permeability ranges
. In the B compaction, the coefficient of permeability ranges
. The freezing ratio for the specimens by E & B compactions shown the good results for the specimens. The state of freezing is similar to the state of the concrete frost which described in the specification. As a result of this analysis, we proposed that the granular materials containing 10% of clayey soil with 10% of the plastic index can be used as a subbase in the pavement. And also the granular materials containing 10% of clayey soil with 15% of the plastic index can be used as a anti-freeze layer in the pavement.
Application Criteria for UTW on Asphalt Pavement
Koo, Han-Mo ; Yun, Tae-Young ; Cho, Yoon-Ho ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 201~208
This research evaluated how the physical property and the thickness of asphalt pavements influence the behavior of UTW(Ultra Thin Whitetopping) before applying UTW to domestic pavements. A 3-Dimensional Finite Element Method revealed that the thickness and elasticity modulus of asphalt and concrete layers, bond strength between the two layers, the size of the slab, and temperature, etc. effected the critical distress. On the basis of these results, HWLS (Heart Wheel Load Simulator), a wheel tracking type machine, was used to carry out an experiment using the thickness of asphalt and concrete pavements, and the temperature as the experimental variables. The result of the experiment showed that the effect of the thickness of the asphalt layer and the temperature change on the tensile strain in the bottom of the slab was insignificant when the thickness of the concrete was 100 mm. In addition, the increased ratio of the tensile strain as the load increases was relatively smaller when compared with the 50mm thick concrete layer. Furthermore, when the thickness of the concrete layer was 50 mm and that of the asphalt layer was less than or equal to 150 mm, the increased ratio of the tensile strain in the bottom of concrete slab with increased load was significantly greater. Thus, it is proposed that the minimum thickness of the asphalt layer after the milling must be at least 150 mm for applying UTW safely.
A Study of the Combination Method of Horizontal and Vertical Alignment by the 3-D Sight Distance Analysis
Kim, Hong-Sang ; Shin, Jae-Myong ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 209~216
A section which combines a horizontal and vertical alignment presents the 3-D nature. In the section, it is certain facts that combined location of the horizontal and vertical alignment combination position affects the amount of available sight distance which might be less than the minimum stopping sight distance. In this study, by comparing the avaliable sight distance determined by the 3-D sight distance analysis with the minimum stopping sight distance, efforts to select a combination range of the horizontal and vertical alignment has been taken.
A Study on the Classification of Owner's Master Specifications
Koo, Jai-Dong ; Kim, Tae-Song ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 217~222
This study suggests how to classify owner's master specifications in organizations such as local governments which place an order for constructing general and various types of facilities. and the principal conclusions of this study can be summarized as follows; Firstly, the Master Specifications for Metropolitan City of Seoul for all facilities. could be integrated by seven individual trades. Secondly, it is advisable from a viewpoint of long term to draw up integrally owner's master specifications by trade for facilities, rather than draw up by group of facilities. Thirdly, editing integrated master specifications for all trades to meet the unified work classification structure should be backed up by high tech, therefore owner's master specifications by trades would be favorable to our situation.
Cost Index for the Site Developing Projects
Park, Jong-Hyun ; Lee, Tai-Sik ; Kim, Hong-Chul ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 223~233
Construction cost indices can be used by the estimator in tender analysis, pricing and price adjustment, cost planning and forecasting. In advanced foreign country, they use several type of cost indices in the part of architectural engineering, civil engineering, plant engineering. There are many kinds of cost and tender price indices, road construction cost index and tender price index, price index for public sector house building, general building cost index, process plant cost indices, electrical service cost index, landscaping cost index, etc. But it is not provided except cost index for road construction in Korea This research is aimed at providing cost index for site developing project, also comparing the each cost index of similar element in site developing project and road project, It is suggested a composite cost index and elemental work cost indices based on analyzing 24 historical BOQ data. Although project type is different, the projects that have similar work content, site developing project and road project, have similar index value. Also the elemental cost indices have same values except for special case in which there is different of work content. Conclusively, there is need to producing cost indices for each project type, subway, airport, harbor, landscaping, building, plant, etc.
Analysis of Critical Factors on the Causes of Profitability in International Construction Projects
Han, Seung-Heon ; Sun, Seung-Min ; Ryu, Ho-Dong ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 235~247
While the globalization of the construction industry provides tremendous opportunities for construction industry, the risks involved with international construction projects are increasing significantly. According to ENR, recently about 13.9% of contractors that entered international construction markets have experienced loss in projects and furthermore, their average profits have also declined continuously. Accordingly, contractors need a strategic risk management system for assessing various risks and improving profitability for overseas construction projects. This paper discusses the long-term trend of profitability performed by Korean contractors in international construction markets during the last 35 years. Then, it analyzes the critical factors by using statistical methods such as Pareto Rule, Factor Analysis, and One-way ANOVA that affect the profitability significantly through the structured surveys from 59 actual overseas projects. These factors can be used in developing a risk management system for international construction project.
The Behavior of Railway Bridge with CWR Track Due to Rail Failure
Chung, Keun-Young ; Kang, Dong-Ok ; Lee, Myeong-Gyu ; Lee, Wan-Soo ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 249~258
In this study, TAP4N (Track Analysis Program for Nonlinear problems) program is developed to deal with the nonlinear bridge-track interaction problems caused by temperature change. This program is designed to consider the geometric nonlinearity of the beam and the material nonlinearity of the track. Nonlinear dynamic equilibrium equation is solved using the Newmark's numerical integral method. And it is also be applicable to the structural system change case, e.g., rail failure. It is expected that load history dependent nonlinear analysis with abrupt change in structural system (boundary condition, material property etc) can be applicable to railway maintenance problems.
Analysis of Accuracy of Framework Data Items Using Digital Map
Park, Hong-Gi ; Yun, Kong-Hyun ; Cho, Heung-Muk ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 2D, 2003, Pages 259~265
This study is a partial fulfillment of the pilot project for framework data which is ongoing as "National Geographic Information System(NGIS) II Basic Plan". It aims at generating framework data and analysing the accuracy. Although it is not the only source of the framework data, a l/l,000 scale digital map is used due to its details. And we compare this product to digital map in Chung-Ju area. Therefore we estimate the accuracy of the outputs which are extracted as the framework date items. In addition, the accuracy means not only absolute accuracy but so relative accuracy such as distance and feature, so that we analyze general pattern.