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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
Optimal Safety Spacing for the Car Following of Adaptive Cruise Controlled Vehicle
Bae, Sang-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 1~7
Among several car following models, GMIT model, the most stable one, was adopted as a platform. The equilibrium condition that the leading and following vehicles are at the same velocity were assumed so that I could obtain the optimum distances at different velocities. Also, I changed and tested parameters in the GMIT model in order to verify the propriety and sensitivity of the model. Based on the simulation results, I could identify decreased safety spacing about 85% when speed is at 100 km/hr. After the sensitivity analysis, I could identify optimal parameters that lead the model to pursue better performance. Accordingly, I conclusively identified that the optimum safety spacing showed as a good indicator in the era of automated highway system in terms of both reduction of congestion and increase of safety.
Quantification of Air Pollution Mitigation with BRT Introduction
Choi, Kee-Choo ; Choi, Yoon-Hyuk ; Jeong, Woo-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 9~17
Atmospheric contamination by exhaust gases and pollutants from auto driving became a social problem. The authors pointed out the problems of traditional transportation demand management policy and introduced the overview of Bus Rapid Transit (BRT) system in a sense that BRT is the basic and important key element of plausible TDM. BRT enables to change the autos-centered transportation system to transit-centered and thereby can decrease the atmospheric contamination more or less. Quantification of such air quality reduction has been estimated using the transportation simulation and incremental logit model. The effect of proposed BRT line over supposed section of national highway No.1 amounted to the benefit of 1,200 million won in 2006, and 1,200 million won in 2020, respectively.
Reconsideration The Relationship Between The Rapid Aging of The Societies and The Older Driver's Traffic Accidents
Kang, Kyung-Woo ; Kwon, Jeong-Tae ; Kook, Woo-Kag ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 19~26
The purpose of this paper is to reconsider the relationship between the aging society and the traffic accidents by older drivers, so it is possible to establish suitable policies for the society. We estimated the changes of the traffic accident rate considering the number of drivers. Also, we analyzed the effect of traffic accidents classified by age. It showed that the accident rate of the older drivers decreased over time, and also that the older drivers have the effect of decreasing the number of traffic accident and the number of deaths in traffic accidents. Due to the analysis on simple accident data and the older drivers' physical frailty, it was generally thought that older drivers increased the accident rate. Therefore, policies should be devised to limit the older drivers' driving. However, our study concludes that traffic policies must be established considering the behavior of the older drivers.
Car Preference Model and Analysis of International Tourism Behavior between South Korea and Japan - According to Asian-Highway -
NamGung, Moon ; Lee, Back-Jin ; Fujiwara, Akimasa ; Zhang, Junyi ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 27~33
The Asian Highway(AH) project was aimed to promoted the development of international transport network, which can connect 32 Asian countries including South Korea, Japan, China, Russia, Iran and other countries. Since countries linked by the AH share a wealth of historical and cultural heritage and their cultures, the AH is expected to contribute the increase of the international tourism attractions and demand. To evaluate the effect of the AH for the international tourism between South Korea and Japan, first Comparison analysis was performed to figure out the difference of international tourism behavior between South Korea and Japan, then some internal barriers to use car for international tourism were investigated, finally a logit model on car use preference was developed to forecast the tourism demand of international tourism between South Korea and Japan. The result of analysis is that the resistance factor of international tourism in Korea-Japan is the cost of tourism and traffic system, and that in the model for preference model, the age and sex of respondents has a difference in preference of using cars. This research is expected to contribute the effective tourism and transportation policy development and tourism demand increase of private car use to the development of Asian Highway from South Korea and Japan.
Speed Predictive Modeling in the Merge Influence Area of the Urban Freeway
Kim, Tae-Gon ; Kim, Seung-Gil ; Shin, Kwang-Sik ; Kwon, In-Yeong ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 35~42
Generally urban freeway plays a key role in the urban transportation system of the big city. However, urban freeways are having a congestion problem on the ramp merge influence areas regardless of the rush hour in Korea. During the rush hours, particularly, serious traffic congestion occurs in the merge influence areas of the urban freeway in Korea. Thus, the purpose of this study was to identify the traffic characteristics in the merge influence areas close to the urban or suburban areas, compare and analyze the correlations between the traffic characteristics in the merge influence areas, and finally develop the speed predictive models at the downstream locations based on the correlations between the traffic characteristics at the upstream and ramp locations in the merge influence area.
A Study on the Development of u-Traffic User Services
Lee, Si-Bok ; Choi, Yang-Won ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 43~51
This study is one of the efforts to build a foundation for nation-wide deployment of the ubiquitous traffic(u-Traffic) services. The primary objective of the study was to define deployment-unit services in u-Traffic area. The existing ITS user services were evaluated for eligibility as u-Traffic services, and the ones with sufficient evaluation scores were selected as candidates for the u-Traffic services. New service components emerging in ubiquitous environment were identified and combined with the candidate services transferred from ITS area to finally obtain u-Traffic user service units. This study also suggests some important tasks to be performed prior to actual user service deployment. These tasks deal with the policy-oriented issues to be addressed for successful implementation of u-Traffic services.
An Integrated Transit Network Design Model and Algorithm
Park, Kyung-Chul ; Chon, Kyung-Soo ; Rhee, Sung-Mo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 53~65
The objective of this research is to develop an integrated transit network design model which tries to minimize the generalized cost of travel while considering various transit modes. A bi-level programming model was formulated for the integrated design model, where the upper-level problem consisted of two main components: a route generation algorithm and a transit route design model. In the route generation procedure, candidate route sets were generated for rail and bus modes, whereas in the transit route design model an optimal set of routes was selected, then respective route frequencies were determined simultaneously using a genetic algorithm. In the lower-level problem, network analysis procedure was explained. The network performance measures were computed through transit assignment and the transit modes of route were determined by route characteristics. The transit assignment model in the model was based on the concept of "optimal strategies," which is able to find optimal strategies satisfying the constraint of a maximum number of transfers. To investigate the performance of the model and to compare it with other models, the application to Mandl's network was performed. Compared with previous works, the developed model showed improvement in terms of number of routes, travel time, and fleet size. The model was also applied to a real transit network in the Kangnamgu district in Seoul, Korea and a concrete and improved transit network was developed and suggested. Some limitations and future research agenda have also been discussed.
Performance and Serviceability of the Ultrathin Pavement Mixture
Park, Tae-Soon ; Kim, Ji-Sun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 67~72
The Ultrathin pavement, one of the preventive maintenance methods, was developed by SCREG Routes Group in France in 1986. This mixture is made up crushed stone aggregates of maximum 10mm, polymer modified asphalt (PG 76-22) and cellulose fiber. The process utilizes a single piece of equipment to place a thin, gap graded hot mix asphalt (HMA) onto a relatively thick layer of polymer modified asphalt emulsion tack coat. The main advantages of Ultrathin pavement are excellent adhesion, reduced rolling noise, rapid application and quick opening to traffic. In this study, the performance of the mixtures were evaluated using the indirect tensile test, wheel tracking test, resilient modulus test and the moisture susceptibility test. The direct shear tests were conducted to investigate the shear resistance of the interlayer when the traffic loads were applied, the ravelling tests were also conducted to evaluate the bonding capacity of the aggregate. The test results presented that the Ultrathin pavement showed not only good condition with a low crack rate but also excellent resistance of crack, rutting and abrasion. The rate of the cracking of the 1 year pavement was only 3% and the performed well. The Ultrathin pavement method is more economical when the method was used as preventive maintenance method and the construction cost of the method was 80% compared to that of the dense mixture for the initial construction stage.
Effects of Deicer on Concrete Pavement Distress
Lee, Kyung-Bae ; Lee, Seung-Woo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 73~80
Deicer spreading is typical winter road management operation. In domestic, pre-wetted spreading method using calcium chloride solution and solid sodium chloride has been applied. However, chloride-containing deicer may cause fatal effect to corrosion of rebar and scaling on cement concrete pavement surface with freezing - thawing cycles. Also, it reduces durability and performance of pavement by reducing concrete strength. In this study, the damage caused by deicers on concrete pavement was investigated by accelerated scaling test and compressive strength test, comparing specimen using CMO with specimens using existing deicers such as calcium chloride, sodium chloride and low-chloride-containing deicer. As a result of tests, the damage on concrete pavement by CMO was negligible compare than the damage by existing deicers.
Development of Traffic Accident Forecasting Models for Trumpet IC Ramp Types of Freeway
Yoon, Byoung-Jo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 81~87
In this study, traffic accident forecasting models according to the alignment and traffic conditions of trumpet Inter-Change (IC) ramp types are introduced. The development of the models is focused on both the real application and the accurate estimations of the models based on the conditions of road alignment and traffic volume. The independent variables essentially required to forecast traffic accidents are selected among major elements which can be easily collected at the stage of both ramp design and operation. The forecasting models according to exit-ramp type (direct, semi-direct and loop) are built with statistical multi-variable regression using all possible regression method. And the forecasts of the models showed high accuracy statistically. It is expected that the developed models could be employed to design trumpet IC ramp more cost-efficiently and safely and to analyze the causes of traffic accidents happened on the IC ramp.
Evaluation of Deformational Characteristics for Subgrade Soils Using Suction Control Testing System : I. Behavior
Seo, Won-Seok ; Lee, Sei-Hyun ; Kim, Dong-Soo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 89~99
In a pavement structure, it is well known that the moisture content of the unbound layers may be changed due to variation in environmental conditions. Moisture content is one of the most environmentally driven variables that can significantly affect the resilient modulus of subgrade soils. For purposes of a new pavement design or evaluation of an existing one, it is necessary to predict the change in modulus corresponding to an expected or measured change in moisture content. Considering the sophisticated procedure of cyclic resilient modulus test, it is more convenient and reasonable to construct a separate modulus-soil moisture model. One of the best ways of modeling of modulus-soil moisture is adopting the ratio of modulus based on the modulus of initial condition which is usually at optimum moisture condition and maximum dry density. In this paper, applicability of three types of models which relate to the modulus ratio and moisture content was assessed using test results of the accompanied paper. Also, a model which relates to the modulus ratio and soil suction is newly proposed. The modulus-soil suction model has an advantage when the suction of field unbound layers is expected or measured based on the concept of unsaturated soil as shown in 2002 AASHTO Design Guide.
Evaluation of Deformational Characteristics for Subgrade Soils Using Suction Control Testing System : II. Model
Seo, Won-Seok ; Lee, Sei-Hyun ; Kim, Dong-Soo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 101~108
In a pavement structure, moisture is an environmentally driven variable that can significantly affect the resilient modulus of subgrade soils which are usually unsaturated. In this study, the variations of deformational modulus with post compaction moisture content were investigated for three subgrade soils using resonant column and torsional shear (RC/TS) testing equipment which was modified to control the suction. A series of tests was performed to evaluate the modulus values using specimens compacted at various moisture contents and compared to the results obtained by post compaction method by suction controlling. Pressure plate extractor test was also adopted to determine the soil water characteristic curve (SWCC) of each specimen and these were compared with SWCCs proposed by AASHTO 2002 design guide. As the suction increased, the moisture content was decreased and the modulus was increased at the whole strain range due to the increase of effective stress among soil particles. During the drying procedure of coarse grained subgrade soils, the modulus values in suction controlling specimens were significantly different from those in specimens compacted at various moisture contents. The normalized modulus reduction curve was almost unique independent of suction pressure or moisture content. Hence it would be possible to develope the modulus-soil moisture model for subgrade soil using maximum modulus at small strain.
Adjustment of Cost Estimate Considering the Correlation between Construction Activities
Moon, Sung-Woo ; Kim, Jong-Soo ; Kwon, Ki-Nam ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 109~115
Historical cost data offers important information about construction productivity. The current information technology makes it easier to store and cumulate the cost data. The cost data, however, needs to be statistically analyzed to better understand the uncertainty residing in construction cost estimate. The objective of this paper is to provide a cost estimate model considering the correlation of construction cost items. The correlations between cost items is analyzed to find out the characteristics of construction project. The degree of correlation was in turn used to adjust construction cost under equivalent uncertainty. A case study was performed using a construction company's real cost data. The results of the study shows that probabilistic approach provides a more reliable estimate of construction cost for decision making in bidding.
The Effect of the Green Space on the Crime in the City
Kang, Jun-Mo ; Kim, Hyun-Jung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 117~129
This study tests the effectiveness of green space in a city as a way of reducing city crimes. To prove the study hypothesis that the increase in green environment in a city may lessen crimes, this study first investigates how the green space distributed around a city affects the city crime frequency. Then, it analyses how the changes in the green space attribute to the rise and fall of the crime occurrence. Based on the 4 districts' police information, We find that if the green space expands, the crime rate drops. In case of smaller district case (Dong), the ratio of green space in the living environment per person was found inversely proportional to the crime occurrence. We also find that the increase in green space is related to the decrease in the crime occurrence when a park bigger than a certain size is distributed regularly. Based on these results, we strongly suggest that green space should be further expanded to lower crime in Seoul.
An Establishment of Emergency Response Scenarios for Developing Standard Operation Procedures (SOP) against Urban Railroad Incidents - Focused on Fire Accident -
Wang, Hyun-Ju ; Kim, Si-Gon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 131~140
The advance of railroad has been increased in the aspect of quantity and quality than before. However, it has been constantly exposed to the risk of railroad accidents because of uncertain system about railroad safety. The Ministry of Construction & Transportation enacted a law including responsibility and obligation to make the standard operation procedures(SOP) to improve the railroad safety system; each corporation operating railroad should construct SOP on the basis of the law. This study has established scenarios for emergency response to build the effective SOP through the analysis of railroad accident types related to railroad accident's potentialities and distinguishable remarks.
A Study on Development of Emergency Response Procedures Based on Scenarios of Urban Railroad Incidents - Focused on Fire Accident -
Jung, Ki-II ; Kim, Si-Gon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 141~150
Emergency response procedures are to be developed based on the emergency response scenario. Activity-action diagrams are suggested, which are needed for the emergency response procedures. Lots of activities are needed to make a consecutive procedure and each activity consists of a bundle of actions by each emergency response personnel. 24 activity-action diagrams are developed on the basis of the events described in the emergency scenarios. They are also used to define the role of each emergency response personnel. 24 diagrams include an incident propagation, an initial response, an opening exit, an evacuation, a control of exit gate, and a recovery etc. Finally, a case study has been performed in order to develope emergency response procedures against a fire accident in tunnel for urban rail transit.
A Study on the Real Time Location Sensing of Moving Object using Active RFID Reference Points of Road Lamp
Cha, Maeng-Q. ; Chang, Ahn-Jin ; Lee, Jae-Bin ; Yu, Ki-Yun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1D, 2007, Pages 151~157
RFID (Radio Frequency Identification) is regarded as a device to facilitate location sensing. Such advantages of RFID can be integrated with LBS (Location Based Service) achieving much synergy effects. This study propose and test a location sensing system using the active RFID tags. Since the coordinates of road ramps are already stored in a database as a digital map form and the road ramps placed along the curbs construct a sort of network, it is proposed to use these road ramps as reference points. Furthermore, these road ramps can provide electrical power to the active RFID tags. Thus, each moving object having a RFID reader receives signals from these active tags and decodes corresponding coordinates of the road ramps. Then, the coordinates of a moving object are determined in real-time using the TDOA (Time Difference of Arrival) algorithm. To test the availability of this system, various kinds of constrained simulations are designed and are conducted. In these simulations, the number of active tags used, the transmission interval of RFID reader devices, and the speed of moving objects are considered as constrained factors.