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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
A Development of Traffic Queue Length Estimation Model Using Occupancy Time Per Vehicle Based on COSMOS
Park, Hyun-Suk ; Kim, Young-Chan ; Moon, Hak-Young ; Kim, Hyung-Chul ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 159~164
The queue and forward congestion detector, used to estimate the length of queue by the COSMOS system, is in the form of a single loop, which contains a fundamental error in the value of velocity - since, in the calculation of velocity, the average length of vehicles is estimated on the basis of the characteristics of a single-loop device. Hence, the reliability in the estimated value of the length of queue, which is calculated using velocity as a variable, becomes lower as well. In this thesis, we attempt to improve the reliability in the estimation of the length of queue by use of average occupancy time as a variable, based on the simplistic proposition that ?the longer the road is congested, the longer becomes the occupancy time of vehicles,?instead of the velocity variable, which contains a fundamental error. The newly developed model was evaluated in a site experiment conducted on the section of National Highway No. 3 where a signal operation demonstration system was installed. As a result the equivalent coefficient and the mean absolute percentage error (MAPE) were found to be 0.93 and 11.25% respectively, which are superior to 0.90 and 21.85% obtained from the existing velocity-based (COSMOS) model, in terms of reliability.
The Effects of Concentration Level of Telephone Conversation on the Automobile Driver's Performance
Choi, Yeoung-Il ; Eum, Kee-Soo ; Oh, Seung-Hoon ; Park, Keun-Snag ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 165~169
The purpose of this study is to know effect on driver of telephone conversation when driving automobile. We enforced automobile driving experimentation to impose on four conditions (The first condition is to driving automobile without call. The second, third, fourth conditions is to drive automobile under three different concentrate level of call). We measured heart rate as a physiological index and NASA-TLX, performance as a subject index. The result shows, using hands-free supporter when driving showed lower performance of 18% and shorter heart rate interval and higher psychological work load of about 3.5 times under fourth condition. The reaction capacity of body appeared low attentiveness depends on telephone conversation when driving. So, the possibility of accident hazard was high because capacity of rapid reaction was decreased about outbreak and increased times of breaking traffic rules because of over burden work such as driving jammed downtown or high speed driving on highway.
Estimation of Distribution Demand for an Urban Rail Transit by Using the Adaptive Neuro-Fuzzy Inference System
Kim, Kyung-Whan ; Kim, Jin-Uk ; Yoo, Hwan-Hee ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 171~178
In order to forecast exactly and induce the demand of urban rail transits, a distribution demand forecast technique of urban rail transits which is more efficient than existing models is required. Thus, in this study a technique of using the Adaptive Neuro-Fuzzy Inference System (ANFIS) was suggested for the technique which reflects the characteristics of medium and long range travel and irregular trip distribution of urban rail transits. For the data to build the model, those of Pusan subways were used. The ANFIS model has the logarithmic scales of each station's trip production and distance between stations as inputs and the logarithmic scale of station choice rates as output. The ANFIS model and a basic gravity model were tested for suitability. As the results of the test, the ANFIS model is better than the gravity model in the statistics of mean absolute error, RMS error, mean error rate, chi-square and r value. And, in the comparison of estimated and observed station choice rates, the ANFIS model is better than the gravity model for linear relation and forecastability. Therefore, it may be concluded that the ANFIS model considers the travel distance and shows high reappearanceability while the gravity model can not explain the trip distribution characteristics by distance.
A Study on Appropriate Size of Pedestrian-friendly City Blocks
Lee, Su-Min ; Kang, Jun-Mo ; Hwang, Kee-Yeon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 179~187
The purpose of this study is to test the hypothesis that how the varying block sizes determine pedestrian-friendly environment in city planning. For this purpose, in Chapter 2, elements that determine on block size and theories about blocks are reviewed. The Chapter 3 analyzes various cases related with pedestrian-friendly block sizes. In Chapter 4, based on literature review and case studies, research methods are proposed to test the study hypothesis. As criteria for pedestrian-friendly conditions, we adopted walking distance and time for varying block sizes. Chapter 5 includes the analysis results.. Six alternative block sizes are selected, and then walking distance and walking time have been measured for 10 randomly selected spots in each one of experimental alternatives. The study results reveal that the small blocks ranging 70m~200m create better environment for pedestrians than the bigger blocks. However, even with large size blocks, the pedestrian environment can be improved by designing inner walkway vividly viewable from outside walkers.. For clearer testimony of the relationship, it is needed that the future study adopt more diverse criteria other than walking distance and time, and that transportation elements other than traffic signal cycle are more thoroughly investigated.
The Estimation of Link Travel Time for Oversaturated Intersections from COSMOS Detector Data
Kim, Young-Chan ; Lee, Eun-Mi ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 189~198
One of the important traffic information provided to the drivers is link travel time. There are many studies on travel time estimation or prediction for signalized intersection, but they usually focus on non-oversaturated traffic conditions. In this study, the method of link travel time estimation at the oversaturated condition was developed. The estimated travel time consists of two portions: cruising time and delay caused by traffic signal control. The cruising time was collected using point detector's speed data. US HCM 2000 delay formula was employed to estimate intersection delay. In order to predict the intersection delay realistically, initial queue length data is needed. The conversion method from detector data into the initial queue length was presented, and microscopic simulator, VISSIM was used to test the performance of the proposed method. This study approaches the states of oversaturation, and developed initial queue calculation model and link travel time estimation method. But the model should consider not only left-turn's influence but also upstream intersection, progression.
Laboratory Characteristics on Frost Heave in Highway Subgrade
Kim, Han-Sub ; You, Kwang-Ho ; Cho, Gyu-Tae ; Kim, Nak-Seok ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 199~205
The paper presents the frost heave properties of subgrade soils in the laboratory. The main objective of this research is to investigate the cause and effect of the freezing pressure on the amount of frost heave in pavement. To achieve its intended purpose, the most commonly used domestic subgrade soils were adopted in the laboratory tests. The laboratory frost heave tests were conducted under simulated field conditions. The container for the tests was manufactured to control the cooling temperature below to -30oC. Within the limits of the tests performed in this research, the test results revealed that the most domestic subgrade soils were not so vulnerable to the frost heave. However, it should be noted that when moisture is supplied to the subgrade and the subgrade is saturated with water for a long period, the frost heave can cause severe distress in pavement.
Analysis on the Preference and Similarity against Bridgescape Composition Factor Employing Multidimensional Scaling Method
Choi, Yeol ; Choi, Jae-Do ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 207~216
A bridge is important structure to determine urban landscape and one of the landmark, so it needs to evaluate bridge's design and bridgescape. The aim of this study is to investigate the preference of day and night landscape and the remarkable landmark out of 8 bridges to represent Busan through Delphi technique, and analyze the similarity on the assessment of bridge's shape, color, light, harmony with the environment which are each bridge's bridgescape composition employing multidimensional scaling method. According to the result, the bridge which has the splendid day and night landscape is recognized landmark. Gwangan Bridge to be evaluated as chosen the best bridge which has landscape and is the supremacy landmark to represent Busan. But the result on the assessment for each bridgescape compositions shows interesting findings. Busan Bridge and Shinho Bridge is bound to the same group as an arch bridge in the bridge's shape aspect and red color which are made of steel in the bridge's color aspect. And Busan Bridge is similar to Gupo Bridge in the bridge's illumination aspect. The Second Nakdong Bridge and the Third Nakdong Bridge are the lowest grade in all items. Gwangan Bridge is the best bridge and cannot compare with others in the day and night landscape and landmark, as well as bridgescape composition which include bridge's shape, color, illumination and harmony with environment. On the other hand, in spite of Yongdo Bridge's symbol, the assessment shows a bad valuation on the old bridge by a low grade at bridgescape composition.
Characteristics of Earth Pressure with Variable Roadbed Thickness by Railroad Loading
Choi, Chan-Yong ; Lee, Seong-Hyeok ; Hwang, Seon-Keun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 217~224
The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from being softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Generally, around 40% of axial loading of train is resisted by rail-tie structure itself and the remainder is transferred to subgrade through the ballast. Therefore research on the load transfer mechanism is needed to optimally design the railroad. In this study, a series of prototype railroad roadbed tests were performed to investigate the earth pressure generated by axial loading of train with variation of the parameters and thickness of the reinforced railroad roadbed. In the tests, the measured earth pressures on the top and at the bottom of the reinforced roadbed were in the range of 25~59kPa and 30kPa, respectively. While the thickness of crushed stone reinforced railroad roadbed varied from 30, 50, and 80 cm the measured earth pressure ratio, was 51.6%, 41.3%, and 38.6%, respectively. This shows that the earth pressure decreased with an increase in the thickness of the railroad roadbed. It was also found that slag roadbed was more effective than the crushed stone roadbed in load distribution. The measured earth pressures in the tests were much smaller than those calculated by empirical and theoretical relationships because the axial loading were not well transferred due to the placement of the ballast without sufficient compaction, and the earth pressures from Talbot's empirical relationship were about twice those from RTRI's empirical relationship and Geotrack
Classification of Raw LiDAR Data using Entropy Theory
Choi, Yun-Woong ; Cho, Gi-Sung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 225~231
In general, a classification process between ground data and non-ground data is required prior to producing a DEM(Digital Elevation Model). Thus, an exact classification between ground and non-ground data from LiDAR(Light Detection And Ranging) data is important in the ground reconstruction process using LiDAR data. In this study, an entropy theory, which has been used as a standard of disorder or uncertainty for data used in the information theory, is used to classify the raw LiDAR data more objectively and generally. In particular, a method that directly uses the raw LiDAR data, which is a type of point shape vector data, without any changes, to a type of normal lattices was proposed, and the existing algorithm that segments LiDAR data into ground and non-ground data as a binarization manner was improved. In addition, this study proposes a generalized LiDAR data classification method that excludes precedent information for buildings and topographies and subsidiary data, which have different data sources.
Cadastral Reconnaissance Surveying in Land Consolidation Area Using Terrestrial Laser Scanner
Lee, In-Su ; Tcha, Dek-Kie ; Kim, Su-Jeong ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 233~239
Terrestrial laser scanning provides highly accurate, three-dimensional images. By sweeping a laser beam over a scene or object, the laser scanner is able to record millions of 3D points in a short period and is widely used in the various fields as one of surveying equipments. This study focuses on the examination on the natural boundaries' extraction using terrestrial laser scanner in Land Consolidation Area. The result shows that it has a good accuracy in positioning and it is also possible to extract a boundary of land parcel. But further researches into the complementary surveying methods and the algorithms for the boundary extraction for furthering the use of laser scanning technology are required.
A Construction of Road Slope Risk Information System Based on Web-GIS
Kang, Ho-Yun ; Kang, In-Joon ; Hong, Soon-Hun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 2D, 2007, Pages 241~248
Korea is topographically and meteorologically prone to natural disasters. In addition to extraordinary weather, localized heavy rain is a irregular occurrence. Highway in Korea are frequently damaged by rain, wind, flood, etc. Recently, slope failures are disastrous when they occur in mountainous area adjoining highways. The accidents associated with slope failures have increased due to rapid urbanization of mountainous area. Therefore, the inspection of slope is conducted to maintain highway safety as well as road function. We developed basic function and risk management of a partial shape on highway slopes based on the internet. It is important for quantitative risk evaluation of highway slopes. The management system will be developed to allow for more accurate decision-making using GIS function based on the internet.