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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 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
Selecting the target year
The Study on Styles and Materials of Automobile License Plates to Improve Readability
Park, Keun-Sang ; Chung, Kyung-Geul ; Kim, Chang-Han ; Oh, Seung-Hwoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 249~254
The purpose of this study is to propose the improved style and material of license plate, which is the exterior panel of the automobile indicating the legal registration codes, in order to provide the observers with the better readability than that of the current number plate in Korea. For the empirical study, the sample license plates were manufactured on three criteria, such as single or double line, reflective or non-reflective, and yellow captions on blue background or blue caption on yellow background. The results are as follows; 1) The average readable distance of the single line samples plates, in the daytime, is longer than that of the double line ones by 22%. 2) The average readable distance of the reflective sample plates, in the nighttime, is longer than that of the non-reflective ones by 14.7%. 3) The reflective yellow caption on blue background were prefectly read farther away than the blue captions on reflective yellow background by 6.4%. Also, there was no significant difference between non-reflective color contrasted samples; blue on yellow background and yellow on blue background.
Development of Evaluation Methodology for Highway and Public Transportation Facility Supply
Chu, Cheong-Yeol ; Yu, Wann ; Lee, Ju-Yeon ; Son, Bong-Soo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 255~262
Currently, supply measures for highway networks and public transportation service in a region is not well defined due to lack of consideration on functional types and service level of highway networks, and land use pattern and density. This study purports to develop a new supply measure, which can take into account more supply information such as highway types, public transportation facility, land use pattern, and so forth. The new measure is composed of two sub-measures such as highway supply measure and public transportation supply measure. The highway supply measure is evaluated by Road Ratio, which is consideration with type of activities and functional types of roads. The public transportation supply measure is evaluated by type of activities and areas of influence. The measure developed in this study can be applied to a region as well as to several regions for comparison. In addition, this measure can take into account the highway and public transportation facility with the consideration on the land use.
Window Tinted Vehicle Impact on Following Vehicle Using RTK GPS
Lee, Chung-Won ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 263~267
The regulation issue on excessive window tinted vehicles has been continuing. It has been believed that those vehicles causes more accidents, simply because of impeding the following vehicle driver sight. In this study, it was even assumed that those vehicles could incur the road capacity reduction by the same reason. This assumption has never been investigated in the field due to the difficulty of the precise data collection. An experimental methodology to collect the required data using RTK GPS receivers has been developed and utilized in the field data collection. According to the headways and acceleration noise analysis, it was confirmed that the window tinting affects the following vehicles in proportion of the tinting degree. A full scale analysis considering various road and vehicle conditions needs to be performed in near future.
The Development of Safety Evaluation Criteria for the Alignment Design Consistency Methods on Rural Highways
Lee, Soo-Il ; Won, Jai-Mu ; Lee, Hee-Seung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 269~274
This thesis focused on the research of a method to evaluate and improve alignment design consistency in the respect of safety. The design consistency depends on the conformance between drivers expectancy and highway geometry, so that the evaluation criteria for consistency should efficiently represent drivers behavioral characteristics. Under the conditions, this research included a new evaluation criteria development and an analysis on how to change evaluation criteria according to roadway alignments, to evaluate safety. The newly developed evaluation criteria, spacing mean represented the drivers behavioral characteristics effectively on association area for a roadway segment alignment. Additionally the interrelationship with accident history data is also high. The existing operating speed evaluation criterion had the limit on the safety validation of roadway alignments association area because of lack of operating speed expectation method. However, new evaluation criteria model can supplement the limited existing criterion. The new evaluation criteria is intended for application by highway agencies to estimate the safety performance an existing or proposed roadway. The evaluation criteria model can be used to compare the anticipated safety performance of two or more geometric alternatives for a proposed highway improvement.
The Development of Evaluation Model for the Bus Service
Lee, Hee-Seung ; Lee, Soo-Il ; Won, Jai-Mu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 275~280
High oil prices and traffic congestion have led to increasing relevant policies and interests in the use of public transportation. The bus service, one of the typical means of public transportation, has shown lower customer satisfaction compared to the subway and, moreover, the service's qualitative and quantitative evaluations are not sufficient. Therefore, this study has developed an evaluation model for bus service in order to consider the two service evaluation items, using structural equation methods. The algorithm can measure the customer satisfaction levels according to bus types as well as the importance of evaluation items and present total service satisfaction, making possible evaluation by bus routes as well as various bus types.
Continuous Network Design Problem Considering Travel Time Reliability
Park, Min-Choul ; Kim, Su-Hyeon ; Park, Chang-Ho ; Chon, Kyung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 281~288
Non-recurrent traffic incident, such as road construction, traffic accident and bad weather condition fluctuates roadway capacity and incurs the uncertainty of travel time. Travel time reliability, as a transportation network performance measure, which may reflect the travel time uncertainty was introduced to network analysis. Recently, researches which applies network reliability concept to transportation network design area were being performing. To reflect fluctuation of link capacity to transportation network design, a continuous network design problem (CNDP) with travel time reliability constraint was formulated as a bi-level model in this study. A simulation-based genetic algorithm with the penalty method was used to obtain the optimal capacity enhancement of each link, combining with a separate module which estimates travel time reliability under link capacity fluctuation. The effect of the travel time reliability constraint on a CNDP was analyzed through a numerical experiment using a simple network. Additionally, the effects of budget allocation and factors to be specified in the model on the results were analyzed.
Retroreflectivity Performance Characteristics Under Environmental Roadway Conditions Based on Influencing Factors
Oh, Heung-Un ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 289~295
Retroreflectivity is known to be correlated to levels of traffic capacity or uniformity of vehicle speeds. The present paper uses the nation wide data base of freeway retroreflectivity then tries to single out the characteristics of retroreflectivity according to levels of influencing factors. Currently, the ergonomic and allowable minimum retroreflectivity for Korean freeway is 110 and 90 mcd/m2/lux for the white and the yellow pavement marking, respectively. It was resulted that observed values do not satisfy the minimum value uniformly. Following levels of influencing factors such as changes by 12 months, annual daily traffic, and material characteristics such as thermoplastic, durable, epoxy, water-borne, and solvent-borne paint, the observed values shows gaps from the minimum values. Consequent conclusions maybe be inferred. First, as observed shows gaps from the minimum values, there should be ergonomic and materialistic study performed for narrowing the gaps. Secondly, for the higher traffic volume road section, there should be countermeasures to maintain uniformity of retroreflectivity. Thirdly, as it is found out there is gaps between observed and ergonomic minimum retroreflectivity, there should be proper ways case by case to choose the materials of pavement markings before painting works. Fourth, as standard deviations of observed retroreflectivity for all influencing factors are considerable, ways to sustain uniformity as one of traffic control devices should be studied.
Decrease in Spaffing Distress of Concrete Pavements by Prevention of Moisture Evaporation
Jeong, Jin-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 297~304
Initially high humidity at concrete surface is continued for a long time by raising curing effectiveness, and smaller difference in the humidity between top and bottom of the slab is maintained as the result. Shear stress can be minimized if the humidities at top and bottom of the slab are maintained at almost same level by raising the curing effectiveness because the humidity variation with the slab depth causes the shear stress. If delamination is not formed in the slab by maintaining the shear stress below the shear strength, spalling due to loads and turning forces of vehicle wheels applied to the delaminated pieces will not develop. A mechanistic approach to minimize the delamination which develops at the slab depth of the greatest humidity change and consequently the spalling by controlling moisture evaporation from surface of the newly placed concrete is explained in this paper. In addition, a tool calculating the shear stress in the slab due to the moisture evaporation was developed and validated by using a series of laboratory test data.
Effect of Structural Characteristics in Flexible Pavement System on Top-Down Cracking Mechanism
Oh, Seung-Hoon ; Kim, Nak-Seok ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 305~310
Economic Evaluation for Road Pavement Maintenance by using HDM
Do, Myung-Sik ; Han, Dae-Seok ; Lee, Jong-Dal ; Lee, Young-Uk ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 311~323
In Korea, the superpave (e.g. stone mastic asphalt) was first introduced in the mid-1990s in order to set up countermeasures against rutting on national roads. This paper aims at suggesting an efficient maintenance policy minimizing expected life cycle cost considering traffic volume in future and the uncertainty in the degradation process of the pavement. Also the pavement deterioration models incorporated in HDM-4(Highway Development & Management-4) which is being used worldwide have been calibrated and adapted to local conditions. We use the observed data, such as rut-depth, crack and roughness for development of deterioration forecast models. Based on calibration result of HDM-4, the economic evaluation including road agency cost and user cost is performed for 22 road sections. Also we try to investigate performance and economic efficiency between superpave and conventional hot-mix asphalt(HMA) on national highway. As a result of the analysis of serviceability for 40 years, superpave was found to have higher resistance against rutting and cracking than HMA in most road sections.
A Study on the Effect of Rehabilitation Methods in Aged Concrete Pavement using the LTPP Data
Hwang, Eun-Sik ; Lee, Seung-Woo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 325~332
In order to extend aged concrete pavement life of pavement, asphalt overlay has been widely used as a rehabilitation method, however it has problems of reflection cracking and early distress of asphalt overlay layer. Various methods including the thickening overlay, use of pre-treatment method of existing concrete pavement and installation of interlayer were suggested. However the effect of rehabilitation method in aged concrete pavement has not been clearly understood. This research explore of rehabilitation method on overlay design on the performance such as IRI, rutting, fatigue cracking, longitudinal.transverse cracking by using LTPP SPS-6, Monitoring data. Severity of these performance and distress data are evaluation on 2002 NCHRP MEPDG (Mechanical-Empirical Pavement Design Guide).
Investigation of Initial Behavior of Airport Jointed Concrete Pavement for Establishment of Performance Criteria
Sun, Renjuan ; Choi, Ki-Hyo ; Kwon, Soo-Ahn ; Jeong, Jin-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 333~339
The temperature and moisture variations of concrete pavement at its early-age significantly affect the initiation and movement of joint cracks. Thermocouples, moisture measurement device, vibrating wire strain gages, and Demec disks were installed in 2 slabs of the IIA (Incheon International Airport) concrete pavement to investigate the environmental effect on the behavior of the concrete pavements. The results showed temperature of the concrete slab significantly affected the joint movement. The setting time of the concrete was determined by using the penetration test results. The strain data was analyzed from the initial setting time based on the test results. The strains measured at different locations and different depths of the slabs showed different variation characteristics. The widths of the joint cracks increased early in the morning when the temperature significantly dropped but, those decreased at daytime when the temperature rose due to the effect of thermal expansion of the concrete. The movements of the joints where the cracks never developed showed opposite trend to the cracked joints.
The Research on Problems of the Ordinary Wages and the Basis of the Regulation for Civil-Engineers
Lee, Yong-Su ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 341~350
This study has put emphasis on examinations and analyses of problems of civil engineer's wage system calculated by multiplying direct labor costs by the rate and factors affecting the wage. As the result of examining the Established Rules of the Fiscal Law involved, even though civil engineers were major technical human resource, they were classified into indirect labor and were paid by indirect labor expenses computed by multiplying direct labor costs by the rate. Distribution by the rate is difficult to control imbalance between contractors and subcontractors. It is also difficult to reflect the expertise and management abilities of civil engineers invested to the establishment and management for construction plans using high priced equipments and precision processing. This study has presented the need and introduction of the research on civil engineers' ordinary wage not multiplied by the rate.
Landuse Analysis of Urban-stream using Aerial Image
Lee, Geun-Sang ; Lee, Hyun-Seok ; Chae, Hyo-Sok ; Hwang, Eui-Ho ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 351~357
In this study, the landuse pattern at the Gab river and the Yudeung river is analyzed using time-series aerial images. This study area is divided by two zones like as inland and floodplain. To begin with, in inland, the landuse area of items such as residential, road, industrial, public facilities is increased by following the urbanization. On the other hand, the area of the other items such as agricultural, forest and river is decreased. Also, the inclination of those two groups is reversed around 1988. Form the results, it is clarified that the Gab river and the Yudeung river are urbanized around 1988. In floodplain, the area of river is decreased as time goes by. This result means that the area of landuse factors such as level-upped riverside land, bridge, head work is increased conversely. Also, the proportion of the water to the river considering the hydrologic factor like rainfall is increased as time goes by. Overall, it is concluded that aerial image can be applied to get a landuse information that is needed in river management and planning.
Improvement of Accuracy and Three-dimensional Digital Mapping with Airborne Laser Surveying Data
Lee, Hyun-Jik ; Ru, Ji-Ho ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 359~368
This study is to improve the accuracy of the Three-dimensional digital map produced using LiDAR data. For the purpose, we derived the problems come from when we produce digital map, and suggested the methods to solve it by analyzing the accuracy of the three-dimensional digital map produced from the LiDAR data. We Compared the buildings and roads on the three-dimensional digital map from the LiDAR data to the existing 1:1,000 digital topographic map. In comparison to the existing digital topographic map, quite differences are appeared on the numbers and areas of the buildings and the length and areas of the roads. The result of the analyzed positional accuracy by GPS surveying is showed too that it is deviated from the accuracy criteria. In case of contour, it was proved more accurate than existing digital topographic map. It is unavailable to make the substantial layer of the boundary on river except for the current flowing area. It is due to the characteristics of the LiDAR data. We produced digital ortho image using digital aeriel photo image acquired with the LiDAR data and performed the experiment to make digital map utilizing the digital ortho image subsidiarily. After the experiment, the problem that buildings and roads are not formed completely in mapping is solved and the positional accuracy is could be raised. And we could have produced the three dimensional layer of the boundary on river, that couldn't be done with only LiDAR data.
Pilot Building of the Web-Bawed Information System for River Environmental and Ecological Information Thematic Maps
Kwon, Hyung-Joong ; Lee, Geun-Sang ; Hwang, Eui-Ho ; Koh, Deuk-Koo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 3D, 2007, Pages 369~378
Currently, the government tries to improve the applicability of RIMGIS (River Information Management Geographic Information System). CS (Client Server)-based RIMGIS was replaced by Web-based RIMGIS, and various thematic maps were established to expand service function of RIMGIS. The objectives of this study were to construct database of river environmental and ecological information, and to produce 14 river environmental and ecological thematic maps, and finally to build web-based information reference system. River environmental and ecological information of water-related national project was categorized into 4 fields (biological, chemical and physical field) and the production processes of each thematic map were suggested. According to established data models of each thematic map and defined spatial/attributive layers, 35 web pages were designed.