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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 26, Issue 6D - Nov 2006
Volume 26, Issue 6C - Nov 2006
Volume 26, Issue 6B - Nov 2006
Volume 26, Issue 6A - Nov 2006
Volume 26, Issue 5D - Sep 2006
Volume 26, Issue 5C - Sep 2006
Volume 26, Issue 5B - Sep 2006
Volume 26, Issue 5A - Sep 2006
Volume 26, Issue 4D - Jul 2006
Volume 26, Issue 4C - Jul 2006
Volume 26, Issue 4B - Jul 2006
Volume 26, Issue 4A - Jul 2006
Volume 26, Issue 3D - May 2006
Volume 26, Issue 3C - May 2006
Volume 26, Issue 3B - May 2006
Volume 26, Issue 3A - May 2006
Volume 26, Issue 2D - Mar 2006
Volume 26, Issue 2C - Mar 2006
Volume 26, Issue 2B - Mar 2006
Volume 26, Issue 2A - Mar 2006
Volume 26, Issue 1D - Jan 2006
Volume 26, Issue 1C - Jan 2006
Volume 26, Issue 1B - Jan 2006
Volume 26, Issue 1A - Jan 2006
Selecting the target year
A Study on the Survey of the Sightseeing Excursion and Information Usage Behavior in the Tourists Area
Kim, Hyun ; Kwon, Young In ; Jung, Byung Doo ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 909~916
This study investigates tourists' sightseeing excursion behaviors and their information usage patterns at Fuji five lakes Area. This paper aims to empirically analyze the relationship between a sightseeing excursion behavior and use of tourist information applying a cluster analysis and a quantitative regression model. The main results are summarized as follows: (1) Tourists' information need is high about 90% of all tourists get information, 80% get the information before travel, 70% on the journey, 60% at the same time. (2) The patterns of information usage are categorized into 3 groups by the timing when tourists try to get the information.(3) There exists a difference among the time-spatial characteristics of excursion's behaviors such as the time after arriving time at sightseeing area, the time till go to home, duration time, and the total travel time between spots, the number of spots, and the size of excursion scale. (4) The quantitative regression model shows that information usage which constrained by time and space significantly determines both the number of the sightseeing spots and the duration time.
Development of a Single Allocation Hub Network Design Model with Transportation Economies of Scale
Kim, Dong Kyu ; Park, Chang Ho ; Lee, Jin Su ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 917~926
Transportation Economies of scale are the essential properties of hub networks. One critical property of the hub network design problem is to quantify cost savings which stem from economies of scale, the costs of operating hub facilities and opportunity costs associated with delays stemming from consolidation of traffic flows. Due to the NP-complete property of the hub location problem, however, most previous researchers have focused on the development of heuristic algorithms for approximate solutions. The purpose of this paper is to develop a hub network design model considering transportation economies of scale from the consolidation of traffic flows. The model is designed to consider the uniqueness of hub networks and to determine several cost components. The heuristic algorithms for the developed model are suggested and the results of the model are compared with recently published studies using real data. Results of the analysis show that the proposed model reflects transportation economies of scale due to consolidation of flows. This study can form not only the theoretical basis of an effective and rational hub network design but contribute to the assessment of existing and planned logistics systems.
Determination of Optimal Locations for the Variable Message Signs by The Genetic Algorithm
Lee, Sooil ; Oh, Seung-hoon ; Lee, Byeong-saeng ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 927~933
The Variable Message Signs (VMS) are useful way to reduce the socio-economic costs due to the traffic congestions and delays by providing the information on traffic condition to drivers. This study provided a methodology to determine the locations of VMS's in terms of the minimization of the delay by applying the genetic algorithm. The optimal number of VMS's was also derived by the economic analysis based on the cost and the benefit. The simulation considered the variation of traffic volume, the frequency and duration of the incident, and the traffic conversion in order to reflect the real situation. I've made a scenario to consider traffic volume and incident, and it can undergo through changing different traffic volume and incident in time and days and seasons. And I've comprised two kinds of result, one is based on empirical studies, the other is based on Genetic Algorithm about optimal allocation VMS. This result of using optimal location VMS, reduce total travel time rather than preceding study based on normal location VMS and we can estimate optimal location VMS each one.
Evaluation of Network Reshuffling Alternatives Based on Key Factors Affecting the Mode Share of Seoul Metro
Jo, Dohyoung ; Sohn, Keemin ; Kim, Daehyun ; Kim, Ikki ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 935~943
Key factors affecting the mode share of Soul metro are investigated. The log-regression model, which can describe the elasticity of the factors with ease, is established rather than the conventional mode choice model is used. The log-regression model requires lower level of data availability for calibration and identifies the impact of the factors on mode share straightforwardly. As a result, it is found that the main reasons why the current mode share of railway is low are due to several problems such as winding lines, inconvenient transfers and unnecessary bypasses. The calibrated model is adopted to evaluate the network reshuffling alternatives. The network reshuffling is to rearrange the existing inefficient railway lines that have frequent transfers and many winding segments. The proposed network reshuffling, which includes straightening winding lines and changing grade separated transfers into cross-platform transfers, turned out to be a good measure to tackle the problems.
A Study for Benefit Calculation of Bicycle Roadway Construction using Contingent Valuation Method
Kwon, Yong Seok ; Lee, Jin Kak ; Son, Young Tae ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 945~950
In implementing transportation projects, benefits have been estimated using conventional benefit components. However, these components have a lot of assumptions and limitations for benefit estimations and thus it seems to be difficult to obtain values of parameters as well as to overlook benefits of non-market goods in calculation process. In other words, current benefit estimations are considered that can be solely measured by directly depending on traffic volumes. Existing economic analysis do not reflect the full benefits, including direct and indirect of the project implementations. To illustrate this fact, bicycle road construction can result in various functional benefits, including improved quality of life, balanced regional development, and good scenery composition. These benefits can not be explained with conventional economic analysis. The objective of this research is to estimate valuation of bicycle road construction using Contingent Valuation Method (CVM). CVM can evaluate user's direct willingness-to-pay as well as maximize bicycle utilization with balanced regional development. This research used the coastline bicycle road construction project for example. The proposed method can be well calculated or estimated benefits for non-market goods of bicycle road constructions using CVM.
Estimation of Tensile Strain Effect Factor of Layer Interface Considering Lateral Loads of Moving Vehicle
Seo, Joo Won ; Choi, Jun Seong ; Kim, Soo Il ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 951~960
Structural pavement analysis considering lateral loads of moving vehicle was carried out in order to simulate passing vehicle loads under various interface conditions. To verify of existing multi-layer elastic analysis of layer interface effect parameters, this study compared outputs by using ABAQUS, a three dimensional finite element program and KENLAYER, multi-layer elastic analysis as vertical load was applied to the surface of asphalt pavements. Pavement performance depending on interface conditions was quantitatively evaluated and fundamental study of layer interface effect parameters was performed in this study. As results of the study, if only vertical loads of moving vehicle is applied, subdivision of either fully bonded or fully unbonded is enough to indicate interface effect parameters. On the other hand, when lateral loads are applied with vertical loads, pavement behavior and performance are greatly changed with respect to layer interface conditions. The thinner thickness of the asphalt layer is and the smaller elastic moduli of the asphalt layer is, the more pavement behavior is influenced by interface conditions. In addition, regression analysis equation analytically computing tensile strain which was considered thicknesses and elastic moduli of the asphalt layer and layer interface effect parameters at the bottom of the asphalt layer was presented using database from numerical analyses on national pavement model sections.
Development of Simple Construction Method for Curbs and L-Type Gutter
Paik, Kyu Ho ; Shin, Young Ok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 961~968
Curbs and L-type gutters installed at the edge of a road are very important structures to protect pedestrians from traffic accidents and to restraint slip of cars due to rain. However, existing construction method where great parts of the construction progress are done by human power has many problems in workability, quality and cost etc. In this paper, a new construction method for improvement in workability and quality for curbs and L-type gutters is developed. In order to investigate the structural safety and quality of curbs and gutters installed by the new method, tensile and lateral load tests are performed on curbs installed by existing and new methods and uniaxial compression tests are also performed on concrete samples of gutters constructed by existing and new methods. The test results show that the alignment of curbs and the strength of gutter concrete are very much improved by applying the new method. The tensile and lateral load capacities of the curbs installed by the new method are 10.7 and 2.5 times higher than those of curbs by existing method, respectively.
Using Next Generation Technologies to Resolve Construction Labor Shortage Problems
Lee, Bok-Nam ; Woo, Sungkwon ; Chang, Chul-Ki ; Koo, Bon-Sang ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 969~974
Labor shortages are a serious problem for Korea's construction industry. The problem is both quantitative and qualitative. There is a shortage in supply as due to a decrease in the influx of new labor, and existing workers are less productive as they age. The problem will only get worse as more and more major public projects are being planned. Options for increasing the labor supply are somewhat limited, and thus efforts need to be made to adopt new technologies that can improve the productivity and efficiency of field work and their processes. This paper introduces seven innovation technologies that have the best potential to increase productivity and thus reduce the burden of labor shortage problems. These include 1) Substitution by use of robotics and automation, 2) development and applications of Innovative materials to reduce on site field work, 3) increase in productivity through the implementation of Information Technology, 4) improved productivity through the application of modules, and prefabrication, 5) prevention of rework and redesign, 6) diversification of labor by integrating labor skills, and 7) improved productivity by standardizing site processes.
Analysis of Construction Company's Bidding Practice under the Lowest Bidding System
Lee, Hyungwoo ; Chang, Chul-Ki ; Kim, Yong-Su ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 975~983
This study analyzed bidding data for construction projects ordered by the Public Procurement Service under the lowest bidding system since 2001 by using statistical technique in terms of construction types, company sizes, bidding prices. This study brings out construction company's bidding practices and problems caused by the current lowest bidding system and suggests the way to mitigate the problems and to improve the lowest bidding system. The analysis shows the problem of winning a bid in abnormally low price under the lowest bidding system, feared at the start, was realized. As bidding practice has polarized with low and high price, the analysis shows that the lowest bid system's market has a high possibility to be distorted by construction companies' bid strategies. To complement the lowest bidding system's problem, the analysis shows that introduction of the bidding system using particulars where bidders estimate construction quantities and unit prices by themselves is needed.
Cutting-Line Sensing Methods for an Automated Concrete Pile Cutter
Kim, Sung-Keun ; Kim, Young-Suk ; Lee, Junbok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 985~993
The use of prefabricated concrete piles have been gradually increased in many construction sites. One of main works for building a concrete pile foundation is to crush a part of pile head which is compressed with more than
. A pile cutting work is usually performed by a crusher and three to four skilled workers. Recent reports on the pile cutting work reveal that a lot of cracks which significantly reduce the strength of the pile and are frequently made during pile cutting operations and it is very repetitive and labor intensive work. To improve productivity, safety, and quality of the conventional concrete pile cutting work, the research on developing an automated concrete pile cutter has been performed. In this paper, sensing methods for detecting a pile cutting line are suggested with operation process algorithms. The suggested methods are very important to develop the automated pile cutter. A pilot-type of the automated pile cutter that adopt one of the suggested sensing methods, is developed and tested in a construction site.
A Study on Improving the License System for Construction Equipment Operators
Kim, Sung-Keun ; Lee, Junbok ; Kim, Hong Cheol ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 995~1002
Construction equipment plays an important role as one of resources in construction process. It is obvious that the machine intensive construction method achieves productivity and quality improvement as well as safety improvement. The number of registered construction equipment in Korea is over 320,000 in 2005 according to the national statistics safety, but recent crisis of construction equipment industrialist has been deepen by lack of skilled workers, rise in wages, diminution of working and etc. The main objective of this paper is to propose an improved management and application policy for the better construction equipment utilization. A classification method for construction equipment and a licensing system for construction equipment operators are newly suggested to revise the Construction Equipment Management Law. In order to satisfy the objective, this research performs literature reviews on domestic and overseas related laws and regulations for operating license, and conducts surveys and interviews with experts in the field of construction equipment industry. The results of this research can be considered as an important reference to update the Law that can improve construction productivity and equipment operating rate.
A Study on the Development of Traffic Accident Information System Based on WebGIS
Jeong, Su-Jin ; Lim, Seung-Hyeon ; Cho, Gi-Sung ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 1003~1010
A Prediction and Distribution of Wetland Based on an E-GIS
Jang, Yong Gu ; Kim, Sang Seok ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 1011~1017
It is so sensitive that the wetland ecosystem very weak in artificial interference and environment change. wetlands are a transitional zone between aquatic and terrestrial ecosystems. This natural property is important to people and life. It is necessary to preservation and protection of the wetland with a countermeasure. we really need to Environment-GIS (E-GIS) and digital map which is included correct position, attribute data and range of the wetland. In this study, we take priority of making a database of wetland management. Moreover, we standardize a digital map production of wetland in our research and we improve accuracy of control survey using GPS surveying. The main purpose of this study is to suggest a pre-estimated wetland that have not yet been discovered. by analysing terrain, geological feature, a geographical distribution of plants and animals using GIS.
Suggestion of Slope Evaluation by DEM-based Aggregation Method
Lee, Geun Sang ; Choi, Yun Woong ; Cho, Gi-Sung ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 1019~1023
The slope information based on DEM is very useful for urban planning, landscape, road design and water resource areas such as rainfall-runoff and soil erosion estimation. The resolution of slope, which is from DEM, can be variously decided by an application fields and the kinds of modeling method. In particular, the more decreased resolution makes the more decreased slope value because of the increased horizontal distance. This study presents slope evaluation method by aggregation method based on discharge and Manning's velocity equation to advance the loss of slope information in according to the resolution, and then applied it to calculate topographic factors of soil erosion model. As a result, conventional method shows 34.8% errors but aggregation method shows 12.6% errors. This study selected up-, middle-, and downstream region in watershed and analyzed the capability of aggregation method in order to estimate the influence of topographic characteristics. As a result of estimation, aggregation method shows more advanced results than conventional method. Therefore, the slope evaluation method by aggregation method can improve efficiently the loss of slope information in according to the variation of resolution in water resource area such as rainfall-runoff model.
Comparison Among Sensor Modeling Methods in High-Resolution Satellite Imagery
Kim, Eui Myoung ; Lee, Suk Kun ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 1025~1032
Sensor modeling of high-resolution satellites is a prerequisite procedure for mapping and GIS applications. Sensor models, describing the geometric relationship between scene and object, are divided into two main categories, which are rigorous and approximate sensor models. A rigorous model is based on the actual geometry of the image formation process, involving internal and external characteristics of the implemented sensor. However, approximate models require neither a comprehensive understanding of imaging geometry nor the internal and external characteristics of the imaging sensor, which has gathered a great interest within photogrammetric communities. This paper described a comparison between rigorous and various approximate sensor models that have been used to determine three-dimensional positions, and proposed the appropriate sensor model in terms of the satellite imagery usage. Through the case study of using IKONOS satellite scenes, rigorous and approximate sensor models have been compared and evaluated for the positional accuracy in terms of acquirable number of ground controls. Bias compensated RFM(Rational Function Model) turned out to be the best among compared approximate sensor models, both modified parallel projection and parallel-perspective model were able to be modelled with a small number of controls. Also affine transformation, one of the approximate sensor models, can be used to determine the planimetric position of high-resolution satellites and perform image registration between scenes.
Analysis of GPS Precipitable Water Vapor Variation During the Influence of a Typhoon EWINIAR
Song, Dong Seob ; Yun, Hong Sic ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 6D, 2006, Pages 1033~1041
In this study, we calculated a space-time variation of GPS precipitable water vapor using GPS meteorology technique during a progress of the typhoon EWINIAR had made an effect on Korean peninsular at 10 July, 2006. We estimated tropospheric dry delay and wet delay for one hourly using 22 GPS permanent stations and precipitable water vapor was conversed by using surface meteorological data. The Korean weighted mean temperature and air-pressure of versa-reduction to the mean sea level have been used for an accuracy improvement of GPS precipitable water vapor estimation. Finally, we compared MTSAT water vapor image, radar image and precipitable water vapor map during a passage of the typhoon EWINIAR.