Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
Volume & Issues
Volume 35, Issue 6 - Dec 2015
Volume 35, Issue 5 - Oct 2015
Volume 35, Issue 4 - Aug 2015
Volume 35, Issue 3 - Jun 2015
Volume 35, Issue 2 - Apr 2015
Volume 35, Issue 1 - Feb 2015
Selecting the target year
MODIS DSI for Evaluation of the Local Drought Events in Korea
Park, Hye Sun ; Um, Myoung-Jin ; Kim, Jeong Bin ; Kim, Yeonjoo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1209~1218
DOI : 10.12652/Ksce.2015.35.6.1209
As the drought disasters are increased in the world, the need of study using satellite image data is on the rise. This study is conducted to analyze the drought in the region using satellite image, and to analyze the correlation with the standard precipitation index (SPI) and the actual drought cases. We selected Dongducheon and Taebaek region for domestic major drought (2001, 2008-2009). The correlation with the SPI and the observed water level data was analyzed using the
spatial resolution and 8days MODIS DSI (Drought Severity Index). In Dongducheon, 6-months DSI has a correlation of 0.71 with the SPI (30). In Taebaek, the correlation between 6-months DSI and SPI (90) was a 0.40 and showed an average hit ratio of 65.7% in comparing with the observed water level of study area. In summary, this study showed a limited correlation between DSI based on satellite images and meteorological drought index SPI and confirmed the possibility of using DSI for the domestic study.
Comparative Study of the Storm Centered Areal Reduction Factors by Storm Types
Lee, Dongjoo ; Hyun, Sukhoon ; Kang, Boosik ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1219~1228
DOI : 10.12652/Ksce.2015.35.6.1219
The Fixed Area ARFs (Area Reduction Factors) method has limitations in providing exact information about spatial distribution due to the lack of enough density of rain gauge stations. In this study the storm-centered ARF was evaluated between frontal and typhoon storm events utilizing radar precipitation. In estimating storm-centered ARFs, in order to consider the horizontal advection, direction, and spatial distribution of rain cells, the rotational angle of rainfall of each rainfall event and the optimum areal rainfall within the spatial rain cell envelope was taken into account. Compared with the frontal storm, the ARF of typhoon storm shows narrow range of variability. It is noted that the ARFs of frontal storm increases with the rainfall duration, but those of typhoon storm shows opposite pattern. As a result the typhoon ARFs appear greater than frontal ARFs for 1~3 hours of duration, but less for more than 6 hours of duration.
Numerical Analysis for Bed Changes at the Meandering Stream due to a Short Term Flood Event
Ji, Un ; Jang, Eun Kyung ; Lee, Chan Joo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1229~1236
DOI : 10.12652/Ksce.2015.35.6.1229
In this study, flow characteristics and bed changes during a short term flood event were analyzed using the two-dimensional CCHE2D model for a meandering sand-bed river, the Naesung Stream. Flow and bed change simulation was carried along the three sub-reaches with sinuosity of 1.2, 1.6 and 2.2 for the 6-day flood event occurring in June 2011. The simulation results indicated that velocity variation due to flow concentration was larger along the sub-reach with the sinuosity less than 1.5 and bed erosion at the outside of the bend was increased by time. In the sub-reach with the sinuosity less than 1.5, the maximum flood discharge produced the maximum flow velocity over 1.6 m/s to 2 m/s locally.
A Novel Scheme to Depth-averaged Model for Analyzing Shallow-water Flows over Discontinuous Topography
Hwang, Seung-Yong ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1237~1246
DOI : 10.12652/Ksce.2015.35.6.1237
A novel technique was proposed to calculate fluxes accurately by separation of flow area into a part of step face which is dominated by flow resistance of it and an upper part which is relatively less affected by the step face in analyzing shallow-water flows over discontinuous topography. This technique gives fairly good agreement with exact solutions, 3D simulations, and experimental results. It has been possible to directly analyze shallow-water flows over discontinuous topography by the technique developed in this study. It is expected to apply the developed technique to accurate evaluation of overflows over weirs or retaining walls (riverside roads) and areas flooded by the inundation in the city covered in discontinuous topography.
Experimental Study on the Characteristics of Flowrate for the Intake System using the Filter Block
Kim, Hyung Suk ; Park, Moonhyeong ; Kim, Won ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1247~1257
DOI : 10.12652/Ksce.2015.35.6.1247
The river water intake system composed of the filter block, without installation of weirs in a channel, was proposed. To apply it to rivers, analysis of hydraulic characteristics is needed. In this study, the hydraulic experiment on the characteristics of flowrate passing through the river water intake system was carried out. The filter block was produced using riprap and stainless steel bead at the channel bottom. The experiment was carried out under various flow conditions and the flowrate passing through the intake system was measured. As the water depth approaching the intake system became deeper, the flowrate diverting to the intake system increased. As the Froude number increased, the flowrate diverting to the intake system decreased. The same trend was shown regardless of the characteristics of a filter block in the intake system. A constant discharge coefficient was shown regardless of the Froude number but it changed according to the size of a riprap and a stainless steel bead in the filter block. It was found that the discharge coefficient increases with the 0.6 power of the material size.
An Analysis of Groudwater Budget in a Water Curtain Cultivation Site
Chang, Sun Woo ; Chung, Il-Moon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1259~1267
DOI : 10.12652/Ksce.2015.35.6.1259
In Korea, rural groundwater development faces new challenge, which have not been experienced so far. The problem is a groundwater depletion by the water curtain cultivation (WCC) during winter season. This study investigates the groundwater depletion using three-dimensional finite difference groundwater flow program, MODFLOW to verify the water budget of the shallow aquifer of Cheongweon area. Interdisciplinary research, which has become a worldwide trend, has been adopted in studying groundwater modeling in field scale. In particular, the method of groundwater recharge estimation adopted precise modeling techniques, SWAT to groundwater flow modeling. Based on qualified field data, the model calibrated and validated its reliability. The objective of this study is to simulate various stream-aquifer interactions according to groundwater pumping with artificial boundaries, such as weirs and drainage system. We also analyzed a seasonal variation of cumulative water budget of the site to quantify the groundwater depletion and recovery in the pumping field.
Flood Alert and Warning Scheme Based on Intensity-Duration-Quantity (IDQ) Curve considering Antecedant Moisture Condition
Kim, Jin-Gyeom ; Kang, Boosik ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1269~1276
DOI : 10.12652/Ksce.2015.35.6.1269
The methodology of utilizing Intensity-Duration-flood Quantity (IDQ) curve for flood alert and warning was introduced and its performance was evaluated. For this purpose the lumped parameter model was calibrated and validated for gauged basin data set and the index precipitation equivalent to alert and warning flood was estimated. The index precipitation and IDQ curves associated by three different Antecedant Moisture Conditions (AMCs) are made provision for various possible flood scenarios. The test basin is Wonju-cheon basin (
) located in Gangwon province, Korea. The IDQ curves corresponding to alert (50% of design flood level) and warning (70% of design flood level) level was estimated using the Clark unit hydrograph based lumped parameter model. The performance evaluation showed 0.704 of POD (Probability of Detection), 0.136 of FAR (False Alarm Ratio), and 0.633 of CSI (Critical Success Index), which is improved from the result of IDQ with single fixed AMC.
Application of Prefabricated Retaining Walls with Steel Lagging
Hong, Jong woo ; Choi, Jae Soon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1277~1285
DOI : 10.12652/Ksce.2015.35.6.1277
It has been known that the conventional retaining wall system with timber lagging and H pile has several problems such as the irregular gap between H-piles, cutting or adding to standard timber, back fill over first step excavation, and especially break-down accident at the disjoint of wall system. In the practical excavation, these problems may lead to worker's accident and the inefficiency of construction economy. To solve the above problems, a new method using prefabricated retaining wall was proposed and verified. The characteristics of the new method is to replace timber wall as free-sliding steel-lagging and connector. To check its verification and application, laboratory tests such as bending strength, tensile strength, and fatigue strength were carried out. Also, a pilot test in the field and numerical simulations under various ground conditions were performed. From the researches, it is found that the prefabricated retaining wall plate can be superior to the conventional timber lagging plate in the strength. It is also found that the proposed methods can be effective in the reuse of retaining wall plate and safe in the disjoint of wall system. Finally, it is desired that the proposed method will be effective in the reduction of the imported timbers and helpful in the safety of retaining wall construction.
Comparative Evaluation of Staggered Pedestrian Crossings and Pedestrian Crossings by Using Risk Analysis
Kim, Tae-Ho ; Park, Jun-Tae ; Lee, Yeon-Hyung ; Rho, Jeong-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1287~1295
DOI : 10.12652/Ksce.2015.35.6.1287
This research is the study on the comparative evaluation of SPC (Staggered Pedestrian Crossings) vs PC (Pedestrian Crossings) using risk analysis. Accident factor was elicited by survey of driver's and pedestrian's at SPC & PC. I estimated the weight of a risk of violation and a mental burden by AHP (Analytic Hierarchy Process) and compared degree of risk at SPC AND PC. In conclusion, a new alternative plan of a pedestrian crossing system, staggered pedestrian crossing which plays an important role in traffic flow, pedestrian's crossings which plats an important role in traffic flow, pedestrian's convenience and traffic safer is sager than pedestrian crossings the degree of risk used this study doesn't imply an measure of the number of accident and the rate of accident, in estimating the degree of risk of pedestrian crossings, we should analyze more data of accident, behaviors, and road circumstance to include driver's and pedestrian's violation behavior in an estimate index.
Development of Traffic Accident frequency Prediction Model by Administrative zone - A Case of Seoul
Hong, Ji Yeon ; Lee, Soo Beom ; Kim, Jeong Hyun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1297~1308
DOI : 10.12652/Ksce.2015.35.6.1297
In Korea, the local traffic safety master plan has been established and implemented according to the Traffic Safety Act. Each local government is required to establish a customized traffic safety policy and share roles for improvement of traffic safety and this means that local governments lead and promote effective local traffic safety policies fit for local circumstances in substance. For implementing efficient traffic safety policies, which accord with many-sided characteristics of local governments, the prediction of community-based traffic accidents, which considers local characteristics and the analysis of accident influence factors must be preceded, but there is a shortage of research on this. Most of existing studies on the community-based traffic accident prediction used social and economic variables related to accident exposure environments in countries or cities due to the limit of collected data. For this reason, there was a limit in applying the developed models to the actual reduction of traffic accidents. Thus, this study developed a local traffic accident prediction model, based on smaller regional units, administrative districts, which were not omitted in existing studies and suggested a method to reflect traffic safety facility and policy variables that traffic safety policy makers can control, in addition to social and economic variables related to accident exposure environments, in the model and apply them to the development of local traffic safety policies. The model development result showed that in terms of accident exposure environments, road extension, gross floor area of buildings, the ratio of bus lane installation and the number of crossroads and crosswalks had a positive relation with accidents and the ratio of crosswalk sign installation, the number of speed bumps and the results of clampdown by police force had a negative relation with accidents.
A Study on the Relationship between Bus Operation Environment and Level of Service of Intra-City Bus - In the place of Ulsan Metropolitan Area -
Kim, Beom-Ryong ; Choi, Yang-Won ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1309~1320
DOI : 10.12652/Ksce.2015.35.6.1309
This study made an attempt to analyse the relationship between operation environment and fleet size per route which represents the level of service for inner-city bus service. Regression analysis method has been adopted as main analysis tool and 98 routes of bus operation status in Ulsan city as of 2013 has also been selected for analysis target. Correlation analysis was performed to identify the relationship between dependent and independent variables. There are three types of model for whole sample, type operation, and bus route operation system. These are the results of the current study. 1. The model developed for whole sample of 98 routes is as follows. Y(Fleet Size)=
(Revenue). This model shows that it is necessary to have more than 140 passengers per day to increase fleet size of each bus route in Ulsan. 2. Models developed by type of operation (which are standard, express, and middle sized) are shown below. Stand Bus : Y(Fleet Size)=
(Revenue). It is identified that more than 153 passengers need to use standard bus to increase fleet size per each standard bus, Middle Sized Bus : Y(Fleet Size)=-0.859+0.00001438*X1(Revenue). For middle sized bus, at least 52 daily passengers are needed to increase number of bus in each route. 3. Models developed for each route operation systems are as belows. Joint Operation Group : Y(Fleet Size)=
(Revenue). Individual Operation Group : Y(Fleet Size)=
(Revenue). These model provide similar result which 140 people is the minimum number of passenger to raise the number of vehicles in each route. This result shows that the route operation systems does not affect the raise number of cars significantly.
A Study on the Analysis of Driver Behavior in Traffic Accidents Using Driving Video Recorder
Cha, Yun-Chul ; Yoon, Byoung-Jo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1321~1328
DOI : 10.12652/Ksce.2015.35.6.1321
The automobiles in Korea have approximately 60 years of history and this is relatively short compared to advanced countries. However, considering the traffic accident rate or severity related to automobiles, various efforts are required to reduce traffic accidents. Various problems caused by traffic accidents are not only related to individual damages but also have become social problems. In order to resolve this, it is important to analyze the cause of traffic accidents. This study aims to suggest methods to reduce traffic accidents by analyzing driving behavior, which is one of the reasons for a number of traffic accidents that were collected through traffic accident videos reported using DVRs (Driving Video Recorder) and were aired to the public via a SBS TV program for the past two years and four months. In particular, unlike other existing studies that aim at analyzing the causes of traffic accidents simply using data, this study constructed a database by analyzing every single DVR that stores the situation before and after the accident using relatively high-resolution video information to provide practical plans to reduce traffic accidents through statistical analysis.
A Study on the Classification of Transportation Connections in Seoul Subway Adjacent Area Using Portfolio Analysis
Kim, Tae-Ho ; Park, Jun-Tae ; Son, Sang-Ho ; Park, Je-Jin ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1329~1338
DOI : 10.12652/Ksce.2015.35.6.1329
This article aims to develop model for the right policy Tools available from the cause analysis regarding the regional differences of subway modal split in Seoul metropolitan area. This allows two major factors of the most influential subway modal split to be proved and Portfolio Analysis is conducted. The results are as follows. Firstly, the two primary factors affecting subway modal split were shown as subway adjacent area and local line bus. It signifies that expansion of subway adjacent area, establishing the number of the subway stations and increase of local line bus are required in order to improve a diminishing subway modal split. Following that, pattern of the improvement to strengthen better subway connections are classified according to the two areas which are Concentration Area of Improvement in Subway Station Area (CAISSA) and Concentration Area of Improvement in Local Bus (CAILB). Our study revealed that Ganbukgu, Seodaemungu, Geumcheongu, and Gwanakgu were selected as the area of CAILB and Songpagu, and Junggu were selected as the area of CAISSA. As all things are considered, transportation policy makers should be taken into account in the two main factors driven by our study according to types in order to enhance the future subway share proportion.
Experimental Investigation of Macroscopic Analysis of Traffic Safety Using Meta Analysis Focused on Busan Metropolitan City
Park, Jongseo ; Oh, Yun Pyo ; Kim, Hoe Kyoung ; Ahn, Woosung ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1339~1345
DOI : 10.12652/Ksce.2015.35.6.1339
Korean government annually estimates and reports the traffic safety index to evaluate the traffic safety of 228 Gu Gun. However, since the traffic safety index is derived from the spatially macroscopic perspective based on collected relative data, there are a couple of problems such as inability to investigate the individual traffic accidents on the spot, insecurity of accuracy and reliability of traffic safety index estimation method, and absence of establishing temporal relationship of traffic accidents. Thus, this study investigated temporal traffic safety in macroscopic manner for Gu Gun in Busan depending on the installation of the traffic safety facility (i.e., urban median), employing meta analysis. As a result, all Gu Gun in Busan except Saha, Buk, Dong, and Busanjin experienced more traffic accidents after installing the urban median, indicating that there are more rooms for improvement of macroscopic traffic safety evaluation.
Estimation of Proper Infrastructure Scale for Transportation Investment
Chung, Sung Bong ; Namkung, Baekkyu ; Park, Shin Hyoung ; Kim, Dongsun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1347~1356
DOI : 10.12652/Ksce.2015.35.6.1347
Since 1970 transportation investment has been made rapidly, however the doubt on duplication and overinvestment of transportation facility also has been brought up. Thus the necessity for reasonable estimation of investment scale increases. In this paper various researches related to this subject are reviewed and categorized according to their methodologies, namely, the methodology using international comparison, trend of investment policy and endogenous economy development model. Based on these methodologies, AHP is applied to calculate proper investment scale. The result shows that the budget for satisfying the investment scale is estimated about 19.51~24.49 trillion won. This value is 4.28~9.26 trillion won higher than the proper investment budget established in National Fiscal Management Plan. In the future, it is necessary to establish systematic and efficient transportation investment plan by developing transportation policy model which can assess the economic feasibility, social equity and environmental soundness etc. at the same time.
An Analysis of Perceptions by Road Construction Engineers on ICEC Framework at the time of System Transition, from Responsibility Supervision to Construction Management (II) - Focused on CM Terminology & ICEC Coordination -
Park, Hyo-Sung ; Kim, Nak-Seok ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1357~1366
DOI : 10.12652/Ksce.2015.35.6.1357
This study (II) aims to draw up the future-oriented construction policy recommendations based on the outcomes as a result of a broad research and conducting questionnaire surveys on the arguable issues raised by construction engineers for roads and bridges in the course of previous study (I) implementation. As for the question of "The term 'Construction Management (CM)' which currently is defined in two (2) ways", 45% of respondents have answered that two (2) different types of CM should be unified into one (1) CM type as is the case in most advanced countries. About the question of "The ways to educate the CM professionals", many respondents have preferred to acquire CM professional certificate after receiving education for a certain period of time from private CM training institutions. As for the question of The revised draft that the ICEC grade of special engineers for design, construction and quality control areas shall be "more than 78 points from a more than 75 points by the original draft." 52% of respondents preferred to maintain the original draft. About the question of "The reason why the CM system has not been working well yet." 62% of respondents have answered that the staff members who are in charge of handling public project procurements are concerned about the fact that their roles (or activities) might be deprived as a result of CM adoption. In order for the CM system to be activated, based on the notion that the construction projects must be out soured, the reshuffle of the headquarter organization of Ministry of Land, Infrastructure and Transportation (MLIT) should be preceded.
A Study on Aggregate Gradation of 10 mm Dense-graded Asphalt Mixture using Slag Aggregate
Jo, Shin Haeng ; Kim, Kyungnam ; Kim, Nakseok ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1367~1375
DOI : 10.12652/Ksce.2015.35.6.1367
The purpose of this paper is to suggest 10 mm aggregate specification for thin layer asphalt pavement using steel slag. Aggregate gradations of conventional dense-graded asphalt mixtures were made by fuller's model, whereas 10 mm dense-graded asphalt mixture was obtained tender mix due to close to the maximum density line. The proposed aggregate gradation specification was made to have enough VMA and well-interlocking refer to foreign standards. The correlation between the proposed aggregate gradation and the properties of mixtures were analyzed using Gradation Ratio (GR) and Compacted Aggregate Density (CAD). The CAD index has a high
of 0.86-0.99 because the CAD index is able to reflect various aggregate properties. As the results of evaluation by CAD index the proposed aggregate gradation provides more reliable stability and VMA. The percent passing (%) of aggregate size smaller than 0.3 mm was limited 10% or more for improving crack resistance. This limitation increased for 15% of the asphalt mixture's toughness.
A Proposal of NIA Model for Eco VE Decision of Construction Facilities
Kim, Joon-Soo ; Kim, Byung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1377~1385
DOI : 10.12652/Ksce.2015.35.6.1377
Construction industry that was the core driving force of Korean economic growth is now being classified as an industry with the largest environmental load emission. Although various efforts were made accordingly to realize eco-friendliness, its effects is insufficient currently. Based on the understanding that eco effect of construction industry would be significant if Eco VE is applicable in the initial project stage, NIA model for understanding the eco VE decision of project owner was developed with simulations in this paper. Based on the proposal report of a private project to develop the Gyeongbuk Northern Region Environmental Energy Town, 20 questions on eco VE decision were used through simulations. The result showed 50% eco-friendly decision. The result of this study can be used to provide decision-making data for eco design in the initial stage of construction by utilizing NIA upon conducting survey research to deduce eco VE decision.
A Study on Strategy for Activating the Standardization in Construction Technology in Connection with Construction R&D Technology
Lee, Kyo-Sun ; Yun, Won Gun ; Kim, Kyong Ju ; Chin, Kyung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1387~1394
DOI : 10.12652/Ksce.2015.35.6.1387
Recently, there is a growing interest in technical standardization all over industry, it is very important for survival in the global market to secure standard patent in almost all of company. Technology in construction industry is essential for quality of people's life and have large impact on national economy development. However, there is lack of investment and low interest in technical standardization in construction industry in comparison with another industries. Therefore this study aims at developing strategies for activating the standardization in construcion technology. Specially, this study carries market analysis and case study for domestic construction R&D Cases. Then, a structured survey and analysis is performed for standardization in construcion technology market to suggest alternative to secure national competitiveness.
Comparative Assessment of Transportation Technology
Kim, Tae-Yeong ; Park, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1395~1404
DOI : 10.12652/Ksce.2015.35.6.1395
This paper provides information for quantitative evaluation of transportation technology, technology development, and transportation R&D and construction engineering policy agenda. Technology classification structure and key words were established and survey was performed to identify key words of technology for transportation. Then, competitiveness of patents and journal articles is evaluated for Korea, USA, Japan, Germany, France, and England. As a result, USA is the most competitive country for all technology categories based on patents and journal articles. Korea is grouped in upper-middle class for overall transportation technology level. However, there are some variances among the level of technologies. The results of this research can be utilized to establish a road map for transportation R&D and plans.
Formal Estimation Method for Optimal Budget Appropriation of Highway Construction Projects under Long-term Continuation Contracts
Koo, Bon-Sang ; Yu, Jung-Ho ; Park, Jong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1405~1412
DOI : 10.12652/Ksce.2015.35.6.1405
In Korea, public infrastructure projects employ "long term continuation (LTC) contracts," which require budgets to be reevaluated and re-appropriated annually throughout the multi-year life of the project. However, such contracts also make it susceptible to frequently changing government policies, in which budgets required for existing projects are allocated to new projects and thus does not provide a consistent stream of capital to multi-year projects. Each year, the KEC needs to attain government funds for construction of its multiple highway construction sites. Because it is difficult to know the amount that may be actually appropriated to KEC in a given year, it is in turn difficult to anticipate and provide sufficient funds necessary for construction to run smoothly and continuously. The lack of a good logic for appropriation has resulted in projects having a skewed distribution of capital. To get better budget appropriations from the central government, the KEC first needs a systemized approach that rationalizes the annual construction capital optimally required for its individual sites. The goal of this research was to devise a way that allows the KEC to determine and calculate the optimal construction costs that would be required for its individual construction sites on an annual basis. Both the optimal progress rate and the essential work types were assessed through a workshop with 24 professionals (KEC employees and contractors) who had extensive experience in KEC projects and also were currently working in these projects.
Development of Model for Selecting Superstructure Type of Small Size Bridge Using Dual Classification Method
Yun, Su Young ; Kim, Chang Hak ; Kang, Leen Seok ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1413~1420
DOI : 10.12652/Ksce.2015.35.6.1413
On the design phase of small size bridge, owing to the lack of related guidelines or standards to determine a superstructure type of bridge, many designers tend to select the type depending on expert's experience and knowledge. Moreover, recently, as types of bridge superstructure become diverse and more conditions need to be considered in the project, the decision makes process become complex. This research covered the selection of a superstructure type of a middle or small size bridge with span length of about 50m, which frequently built for national roadway, selecting type of bridge superstructure more systematic way rather than the existing ways to compare construction methods or to depend on expert's experiences. This study proposes to build a bridge superstructure type selection model using one of the techniques of artificial intelligence techniques SVM by applicability of the model examined through the verification of the actual case.
Improvement of the Standard Cost of Development Charge System in Jeju
Hong, Seung-Jong ; Lee, Dong Wook ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1421~1429
DOI : 10.12652/Ksce.2015.35.6.1421
During the six years from 2006 to 2011, based on a study of projects with an area equivalent to or less than
located in Jeju self-governing province, it was shown, through comparison with the pre-existing calculation methods, that there were many problems with the application of the standard cost. Accounting for the uniqueness of Jeju province, the study suggested an alternative method for applying the standard cost, basing it on property usage of either urban area or non-urban area pursuant to the National Land Planning and Utilization Act rather than land type of either mountain area or non-mountain area, with the utilization of T-test and ANOVA raising the reliability of this study.
The Performance and Effectiveness Analysis of Standardization in Construction R&D Project
Lee, Kyo-Sun ; Yun, Won Gun ; Kim, Kyong Ju ; Chin, Kyung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1431~1438
DOI : 10.12652/Ksce.2015.35.6.1431
According to the report from OECD, 80% of world trade quantity was influenced by standard, 50% of EU trade demand certification of forced standard. This leads to develop standard connected with R&D in most country and company worldwide. Recently, Technical standards have advantage of reduction of production cost and market dominating power. Standardization of construction technology has very important role that ouput of R&D refer to KS, national construction standards and it activates in the market. However, domestic construction research related to effectiveness of standadization fall short of expectation in comparison with manufacturing industry. This study present criteria that can analyze the performance and effectiveness in construction R&D project connected with standardization. And it applied domestic R&D cases (finished from 2000 to 2009), analyzes ouput of standadization and economic effect to verify the value of construcion technology standardization.
A Study on the Influence of the Urban Characteristics on the Incidence of Crime Using Panel Model
Lee, Hyo Jin ; Lee, Jae Song ; Choi, Yeol ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 6, 2015, Pages 1439~1449
DOI : 10.12652/Ksce.2015.35.6.1439
This study, based on the sociological crime theory, is to examine the relation between urban characteristics and the incidence of crime, helping establish effective crime prevention measures. For doing so, the study employs crime data from the Supreme Prosecutors' Office and socio-demographic data including the regional Statistical Yearbooks -both from 2005 to 2012- to build the study's panel data, and analyzes the panel model on the 16 subordinate districts in the city of Busan. To reduce the incidence of crime and prevent crimes from occurring based on the analysis results, first, prevention measures specific to each region by its attributes are needed rather than general ones; second, new institutional frameworks or policies are required for utilizing accurate crime data; third, interdisciplinary research in which various fields including urban engineering are associated to that of social science is necessary to further the study.