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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 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
An Experimental Study on the Structural Performance of Horizontally Curved Precast PSC Girder
Lee, Doo Sung ; Choi, Woo Suk ; Kim, Tae Kyun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 747~757
DOI : 10.12652/Ksce.2015.35.4.0747
The main purpose of this study is to investigate the static behavior of a horizontally curved prestressed concrete (PSC) girder. A 30m long full-scale curved PSC girder with 80.0m radius is fabricated by a portable curved form system. Deflections and concrete strains at the middle of span were measured. The obtained experimental results have been compared to those from F.E.A. analysis. When a initial crack developed, the applied load was 1.3 times the service design load and the vertical deflection at the middle of span satisfied the requirement for a live load state according to the Korea Bridge Design Specifications (2010). Also, the ductility of the full scale specimen satisfied the limit in the Specifications (2010). To verify the experimental results, a numerical F.E. analysis was carried and confirmed that the data were similar with results from the test above. The horizontally curved PSC girder fabricated on site was found to have enough strength for safety under and after construction.
Seismic Behavior of Bridges Considering Ground Motion Spatial Variation
Bae, Byung Ho ; Choi, Kwang Kyu ; Kang, Seung Woo ; Song, Si Young ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 759~768
DOI : 10.12652/Ksce.2015.35.4.0759
The ground motions of large dimensional structures such as long span bridges at different stations during an earthquake, are inevitably different, which is known as the ground motion spatial variation effect. There are many causes that may result in the spatial variability in seismic ground motion, e.g., the wave passage effect due to the different arrival times of waves at different locations; the loss of coherency due to seismic waves scattering in the heterogeneous medium of the ground; the site amplification effect owing to different local soil properties. In previous researches, the site amplification effects have not been considered or considered by a single-layered soil model only. In this study, however, the ground motion amplification and filtering effects are evaluated by multi-layered soil model. Spatially varying ground motion at the sites with different number of layers, depths, and soil characteristics are generated and the variation characteristics of ground motion time histories according to the correlation of coherency loss function and soil conditions are evaluated. For the bridge system composed of two unit bridges, seismic behavior characteristics are analyzed using the generated seismic waves as input ground motion. Especially, relative displacement due to coherency loss and site effect which can cause the unseating and pounding between girders are evaluated. As a result, considering the soil conditions of each site are always important and should not be neglected for an accurate structural response analysis.
Rheological Models for Simulations of Concrete Under High-Speed Load
Hwang, Young Kwang ; Lim, Yun Mook ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 769~777
DOI : 10.12652/Ksce.2015.35.4.0769
In this study, the rheological models were introduced and developed to reflect rate dependent tensile behaviour of concrete. In general, mechanical properties(e.g. strength, elasticity, and fracture energy) of concrete are increased under high loading rates. The strength of concrete shows high rate dependency among its mechanical properties, and the tensile strength has higher rate dependency than the compressional strength. To simulate the rate dependency of concrete, original spring set of RBSN(Rigid-Body- Spring-Network) model was adjusted with viscous and friction units(e.g. dashpot and Coulomb friction component). Three types of models( 1) visco-elastic, 2) visco-plastic, and 3) visco-elasto- plastic damage models) are considered, and the constitutive relationships for the models are derived. For validation purpose, direct tensile test were simulated, and characteristics of the three different rheological models were compared with experimental stress-strain responses. Simulation result of the developed visco-elasto-plastic damage(VEPD) model demonstrated well describing and fitting with experimental results.
Evaluation of Thermal Movements of a Cable-Stayed Bridge Using Temperatures and Displacements Data
Park, Jong Chil ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 779~789
DOI : 10.12652/Ksce.2015.35.4.0779
Because cable-supported bridges have long spans and large members, their movements and geometrical changes by temperatures tend to be bigger than those of small or medium-sized bridges. Therefore, it is important for maintenance engineers to monitor and assess the effect of temperature on the cable-supported bridges. To evaluate how much the superstructure expands or contracts when subjected to changes in temperature is the first step for the maintenance. Thermal movements of a cable-stayed bridge in service are evaluated by using long-term temperatures and displacements data. Displacements data are obtained from extensometers and newly installed GNSS (Global Navigation Satellite System) receivers on the bridge. Based on the statistical data such as air temperatures, each sensor`s temperatures, average temperatures and effective temperatures, correlation analysis between temperatures and displacements has been performed. Average temperatures or effective temperatures are most suitable for the evaluation of thermal movements. From linear regression analysis between effective temperatures and displacements, the variation rate`s of displacement to temperature have been calculated. From additional regression analysis between expansion length`s and variation rate`s of displacement to temperature, the thermal expansion coefficient and neutral point have been estimated. Comparing these parameters with theoretical and analytical results, a practical procedure for evaluating the real thermal behaviors of the cable-supported bridges is proposed.
Development of a Functional Mortar for Algae Growth Restraining by Using Soluble Glass
Kim, Jun Hwan ; Kang, Hojeong ; Choi, Se Young ; Lim, Yun Mook ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 791~799
DOI : 10.12652/Ksce.2015.35.4.0791
This study focuses on the algae growth restraining. Many researches on a critical damage from algae growth are published, but it is hard to find how th restrain. Abnormal algae increasing is a problem, because it makes red tides, biodeterioration, etc. Therefore this study aims to decrease the damage from algae growth. Some metal ions have been used microorganism killing materials from old times. Especially, Cu ions are highly effective. Based on these uses of the metal ions, a functional mortar which restrains algae growth is developed. The mortar contains soluble glass which dissolve in water. The soluble glass was made of Cu ions and phosphates. When the soluble glass is dissolved, Cu ions are soaked out stably from the soluble glass. Culture mediums which incubate algae were made to evaluate the developed mortar specimens. Culture mediums were filled with fresh water and sea water. Algae were incubated for fourteen days in culture mediums. The evaluating methods are measuring volume of the dissolved organic carbon and the chlorophyll. Using these two measurements, the mortar specimens are judged that can restrain algae or not. According to the result, the functional mortars of culture medium filled with fresh and sea water shows similar trend. The functional mortar for restraining algae growth performs that`s role well.
An Indeterminate Strut-Tie Model for Prestressed Concrete Beams
Chae, Hyun Soo ; Yun, Young Mook ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 801~814
DOI : 10.12652/Ksce.2015.35.4.0801
In this study, a statically simple indeterminate strut-tie model is proposed for the rational analysis and design of simply supported prestressed concrete beams by reflecting all characteristics of nonlinear structural behavior and load transfer mechanisms. In addition, a load distribution ratio that allows to transform the proposed indeterminate strut-tie model to a determinate model is also suggested to help structural designers conduct the structural analysis and design of simply supported prestressed concrete beams by using the strut-tie model method of current design codes. For verifying of the validity of the proposed model and load distribution ratio, the ultimate strengths of 47 simply supported prestressted concrete beams tested to failure were estimated and the results were compared with those by the strut-tie model methods of current design codes.
Estimation of Interception in Cheonmi Watershed, Jeju Island
Chung, Il-Moon ; Lee, Jeongwoo ; Kim, Nam Won ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 815~820
DOI : 10.12652/Ksce.2015.35.4.0815
For the establishment of effective water resources management platform for Jeju-Island, the characteristics, including surface runoff, evapotranspiration, groundwater recharge and discharge are to be properly quantified. Among these hydrologic components, interception due to vegetation is very important factor but it is hard to be quantified. After Von Hoyningen-Huene (1981) found the relationship between LAI (Leaf Area Index) and interception storage, LAI has been used for key factor to estimate interception and transpiration. In this study the equation suggested by Kozak et al. (2007) is implemented in SWAT-K (Soil and Water Assessment Tool - Korea) model and is tested at the Cheonmicheon watershed in Jeju-Island. The evaporation due to interception was estimated as 85~104mm, 8~11% of whole evaporation. Therefore it is necessary to consider the evaporation due to interception as a controlling factor to water budget of this watershed.
An Analysis of Bed Change Characteristics by Bed Protection Work
Son, Ah Long ; Kim, Byung Hyun ; Moon, Bo Ram ; Han, Kun Yeun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 821~834
DOI : 10.12652/Ksce.2015.35.4.0821
This study presents the analysis of flow and bed change characteristics considering bed protection work built on the immediate downstream of weir to protect river bed from scouring. The study area is 37km reach from Hyunpoong station to Masuwon station including Hapcheon- Changryoung multi-function weir in the Nakdong river. CCHE2D model is calibrated and validated for evaluating the flow and bed change characteristics during Typhoon Kompasu in 2010. Three simulation conditions are set up: Case 1 is a natural channel without installation of weir. Case 2 involves an installation of weir in the natural channel. Case 3 involves an installation of weir with bed protection in the natural channel. Flood frequency (50, 100 and 200yr) is applied to each scenario to analyze the effects of bed protection work. While the sediment rate is increased in the downstream of fixed gate and sluice-type gate, river bed scouring rate is increased in the downstream of lift-type gate in Case 2 comparing with the results of Case 1. The river bed scouring is not occurred in the immediate downstream of weir (~30m) due to the effect of bed protection, but larger amount of sediment is occurred in the downstream of weir (60m~) which the bed protection is not installed comparing with the results Case 1. Through the results of simulation considering bed protection work, this study would be helpful to expect bed change and operate the weir as well as manage.
Effects of Irrigation Reservoirs and Groundwater Withdrawals on Streamflow for the Anseongcheon Upper Watershed
Lee, Jeongwoo ; Kim, Nam Won ; Chung, Il-Moon ; Lee, Jeong Eun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 835~844
DOI : 10.12652/Ksce.2015.35.4.0835
Streamflow responses to irrigation reservoirs and groundwater withdrawals were simulated using the integrated surface-water and groundwater model, SWAT-MODFLOW for the upstream watershed of the Gongdo station located in the Anseong stream. The simulated results indicated that the irrigation water supply from the Gosam and the Geumkwang reservoirs has caused the decrease of 31.2%, 82.5% in drought flows below the reservoirs, respectively, against the natural flow condition. While, at the outlet of the study watershed, the effects of the irrigation reservoirs were insignificant due to the delayed return flows with the decrease of 5.7% in drought flow. Both of the irrigation reservoirs and groundwater withdrawals have reduced the drought flows by 19.2% at the Gongdo station.
Empirical Formula for Wave Runup of Rubble-Mound Structure Covered by Tetrapods: 1:1.5 Slope Condition
Lee, Jong-In ; Bae, Il-Ro ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 845~852
DOI : 10.12652/Ksce.2015.35.4.0845
The runup height is an important design parameter to determine the crest elevation of coastal structures and seawalls. In this study, two dimensional wave runup tests for rubble-mound structure covered by tetrapods were conducted. Incident waves at the toe include nonbreaking, breaking and broken random wave conditions. A empirical formula to predict runup elevation of rubble-mound structure with 1:1.5 front slope was proposed on the basis of physical model test results using a surf similarity parameter. The test results from this study were compared with those from van der Meer and Stam(1992).
Finite Difference Modeling of a Piled Raft Foundation with Axisymmetry Condition and Interface Element
You, Kwang Ho ; Kim, Hyung Ryul ; Bae, Sang Han ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 853~861
DOI : 10.12652/Ksce.2015.35.4.0853
In this study, FDM modelling with axisymmetry condition and interface element was verified whether it is reasonable to estimate compositive behavior of a piled raft foundation. To this end, the modelling validity of piled raft foundations was estimated by comparing and analyzing numerical analysis results and laboratory model test results. Also, load bearing ratio of a raft is analyzed by performing sensitivity analysis of foundation parameters with the actual field conditions. As a result of this study, correlation between bearing capacity and vertical displacement of numerical results turned out to be similar with that of a laboratory model test. In addition, ultimate bearing capacity of piled rafts and load bearing ratio of the raft is calculated to be similar in both cases. The load bearing ratio of the raft was also estimated to be in the range of 33% to 52% from the sensitivity analysis. The results were confirmed to be similar to the previous studies. Therefore, it can be inferred that piled rafts can be effectively modelled applying axisymmetry condition and interface element.
The Reinforcing Effect of Blade Attached Pile to Support Submerged Breakwater
Jeong, Sangseom ; Hong, Moonhyun ; Ko, Jun ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 863~874
DOI : 10.12652/Ksce.2015.35.4.0863
The use of pile reinforcement is considered as one of the most promising techniques for improving load carrying capacity of piles in offshore area. In this study, to consider the horizontal and uplift bearing capacity of submerged breakwater bearing pile, exclusive analysis on load-transfer behaviour of pile was conducted. First of all, check the reinforcing effect from the three-dimensional finite element method, and estimate load transfer curve (ground reaction force). Based on these results, the reinforcing effect was quantified by estimating the coefficients of horizontal and uplift reinforcement of reinforced piles. Load transfer function with consideration of the reinforcing effect was proposed from estimated coefficients. A comparison of the analysis using the proposed load transfer function with three-dimensional finite element analysis has resulted that the proposed load transfer function is displaying good accuracy of predicting behavior of the load transfer between the pile and soil reinforcement. Interpretation of the submerged structure by applying a load transfer function considering the reinforcing effect, has shown that the reinforced pile`s shear, bending moment and displacement are less than that of non-reinforced piles, while the subgrade reaction modulus arises greater. Thus, it is expected to be relatively cost effective in terms of design.
A Study on the Transport Mode Choice for Asian Highway No.6 Route
Lee, Back Jin ; Lee, Se Hong ; Lee, Yun Seok ; Lee, Deok Hwan ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 875~886
DOI : 10.12652/Ksce.2015.35.4.0875
By promoting the international transportation and the improvement of advanced exchange between South and North Korea, the Asian Highway plan was expected to make considerable economical effects in the North-East Asian region. This study focuses on a part of AH6 route (i.e., South Korea-North Korea-China-Far East Russia) and aims to analyze the behavioral change of international passenger transport around the Korean Peninsula by assuming the non-existent North Korea land transport network connectivity. The study was performed using two main methods. First, a stated preference survey was performed to derive the actual modal share of each travel mode. Second, a disaggregate analysis was performed to develop possible mode-choice models for international passenger travel and find out the suitable choice. Based on the results of the model estimation, it is found that over 90% of the international passenger transport would be converted to land transport (rail+highway). In addition, international railroad modal share rate would be increased from 62.8% to 66.1% and international bus would be decreased from 29.6% to 21.9% as the distance lengthened (903km~1,631km).
Estimation of AADT Using Multiple Linear Regression in Isolated Area
Kim, Tae-woon ; Oh, Ju-sam ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 887~896
DOI : 10.12652/Ksce.2015.35.4.0887
This study estimates future AADT using historical AADT and socio-economic factors in isolated area. Multiple linear regression method by socio-economic factors are lower MAPE and higher R-square than using historical AADT. Analysis of socio-economic factors influence AADT in isolated typical areas, varied socio-economic factors influence on AADT. In isolated coastal areas, oil price influence on AADT. AADT forecasting model in isolated area is excellent when analysising
and MAPE. It is assume that estimation of AADT in isolated area using multiple linear regression is accurate because of a little passed traffic volume and traffic volume fluctuation.
Signal Timing Calculation Model of Transit Signal Priority using Shockwave Theory
Park, Sang Sup ; Cho, Hye Rim ; Kim, Youngchan ; Jeong, Youngje ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 897~905
DOI : 10.12652/Ksce.2015.35.4.0897
This research suggested the traffic signal calculation model of active transit signal priority using a shockwave model. Using this signal priority timing optimization model, the shockwave area is computed under the condition of Early Green and Green Extension among active transit signal priority techniques. This study suggested the speed estimation method of backward shockwave using average travel time and intersection passing time. A shockwave area change is calculated according to signal timing change of transit signal priority. Moreover, this signal timing calculation model could determine the optimal signal priority timings to minimize intersection delay of general vehicles. A micro simulation analysis using VISSIM and its user application model ComInterface was applied. This study checked that this model could calculate the signal timings to minimize intersection delay considering saturation condition of traffic flow. In case studies using an isolated intersection, this study checked that this model could improve general vehicle delay of more over ten percentage as compared with equality reduction strategy of non-priority phases. Recently, transit priority facilities are spreading such as tram, BRT and median bus lane in Korea. This research has an important significance in that the proposed priority model is a new methodology that improve operation efficiency of signal intersection.
A Study on the Transportation Demand Management Policy Using AHP Analysis - Domestic and Foreign Policy Comparison of Importantance Measurement -
Kim, Ki Hyung ; Lee, Joo Hyung ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 907~920
DOI : 10.12652/Ksce.2015.35.4.0907
By increase owning vehicle, infrastructure that accept vehicle is very poor on present that People`s commuting is rapidly change to vehicle-use-form in metropolitan area. Although Transportation demand management is enforced, traffic is heavy but studies lake in internal and external. This study select Transportation demand management that enforce in internal and external and do a survey. Based on this survey, conduct AHP (Analytic Hierarchy Process) analvsis, Transportation demand management that enforce internal and external compare, decide superiority and understand every particular items` importance and satisfaction that users think. Also based on importance that collect by AHP analysis compare Transportation demand management character. Finally figure that grasped by this study, analysis present, found future TDM course and applicate future transportation improvement.
Analysis of Traffic Accident Reduction Performance of High-quality and Long-life Pavement Marking Materials
Lee, Myunghwan ; Choi, Keechoo ; Oh, In Seop ; Kim, Junghwa ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 921~929
DOI : 10.12652/Ksce.2015.35.4.0921
Road conditions which obstruct the driver from seeing road markings, such as in the evening or in the rain, due to the lack of a light source gives way to increasing the risk of traffic accidents. In order to increase road safety, the Korea Expressway Corporation set up a pilot project which used high-quality materials along a section of the Gyeongbu Expressway between Daejeon and Pangyo. There is little research on high-quality materials in the field of pavement marking. This study introduces high-quality materials used in pavement materials, presents the results of a survey conducted to examine the effect of the pilot project and analyzes traffic accident data from before and after the implementation of the pilot project. The survey results show that 87% of the respondents were highly satisfied with the pilot project. With the goal of evaluating the effect of the pilot project, this study used traffic accident data provided by the Korea Expressway Corporation accident data and performed a before-after study of the number of traffic. The results of data analysis show that there were 62 and 48 traffic accidents before and after the implementation of the pilot project. In addition, the result of Emperical Bayes Method indicates that there is an 41.7% decrease in the number of traffic accidents as an effect of High-quality Pavement Marking Materials.
Investigation on the Repeatability of Modified Proctor Test for Roller Compacted Concrete Pavement
Hwang, Seok Hee ; Rith, Makara ; Hong, Seong Jae ; Lee, Seung Woo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 931~940
DOI : 10.12652/Ksce.2015.35.4.0931
Roller Compacted Concrete Pavement (RCCP), is a type of pavement using compaction roller and asphalt finisher on concrete mixture that contains low amount of water. RCCP strength and durability are greatly affected by compaction level. Quality control is performed by ensuring the degree of compaction at site based on dry density. In the field, Modified Proctor Test is used in order to obtain optimum dry density. However, there is no clear compaction curve analysis criteria of Modified Proctor Test for RCCP. In this study, compaction curve built by three samples of Modified Proctor Test was produced and it was used to compare with compaction curve contented lower number of samples (one and two samples) in order to analyze their reliability. Thus, a conclusion was drawn from the results; by comparing to the result from Modified Proctor Test of three samples, the use of two samples represented result with only 0.5% of error which means the reliability is 99.5%.
Constructability Assessment Model for International Construction Projects Using Structural Equation
Lee, Yong Wook ; Lee, Sang-Ku ; Jang, Woosik ; Han, Seung-Heon ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 941~951
DOI : 10.12652/Ksce.2015.35.4.0941
In the recent years, Korean construction companies have been awarded 680 billion USD in the oversea projects which lead to a successful quantitative growth. However, due to the lack of capability in the core technology and project management compared to the leading companies, in addition to low-price bidding, massive deficit projects have caused problems to the companies. In order to overcome the limitations of the lack of capabilities, the term constructability has been researched recently by developed countries to apply in the practical use. The concept of constructability must be applied for Korean companies to compete in the EPC construction projects. The term constructability is defined as the factor that affect the overall construction process of a project which is defined by the ease of construction and to secure the project quality. Therefore, this study aims to develop a constructability assessment model using the structural equation to assess the factors that affect the constructability in the design and construction stage. The purpose of using the structural equation is to analyze the direct and indirect correlation between each factor that affects the international construction projects. Total of 8 latent variables and 34 measured variables are derived through literature review, corporate reports, experts` interview and surveys. The result of the model suggests the constructability factors that are to be managed the most efficiently to reduce cost, time and improve the quality as well as a countermeasure strategy to successfully execute the target international construction projects.
Development of Causal Map for Sustainable Transportation Facilities Using System Dynamics
Bae, Jin Hee ; Park, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 953~959
DOI : 10.12652/Ksce.2015.35.4.0953
The global warming caused by consumption of fossil fuel and energy has been interested. Therefore, several policies and regulations have been discussed to reduce greenhouse gas emission and effective energy consumption. The construction industry that takes 45% of energy consumption makes efforts to develop green construction methods and materials and reuseable energy. However, there is no common definition to calculate greenhouse gas and database in the construction industry. Especially, transportation infrastructure like road, railway, harbor, and airport consumes 21% energy of construction facilities. Therefore, this paper develops the causal relationship to define performance of sustainable road construction and maintenance. The performance indices are grouped into economic, social, and envirionmental impacts. Then, the causal map is developed based on survey results of construction experts. This will provide the baseline to evaluate the performance of sustainable construction and to establish the objective goals.
Improved Method for Increasing Maintenance Efficiency of Construction Structure Using Augmented Reality by Marker-Less Method
Moon, So Yeong ; Yun, Su Young ; Kim, Hyeon Seung ; Kang, Leen Seok ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 961~968
DOI : 10.12652/Ksce.2015.35.4.0961
As BIM has been increasingly applied to building project recently, its application to civil engineering project is also on the rise. As construction structures have been expanded and complicated in a size and type, the information for handling maintenance process has also increased. Thus, to actively utilize the BIM information created at the design stage, this study has been carried out to establish a maintenance system using a marker-less based augmented reality method, by presenting a maintenance system for the construction structures using augmented reality. A SURF algorithm is used to link the 3D objects in the design and construction phases to the maintenance phase. The presented method in this study can increase the utilization of 3D information created at the design stage, by offering an augmented reality technology at the maintenance stage. The method could also improve the efficiency of visual inspection on construction structures by augmenting 3D model of a bridge structure.
Improvement Directions through the Analysis of the Current States of Response Systems against Railway Casualties and Accidents of Urban Railways
Mo, Chun Suk ; Kim, Si Gon ; Kwon, Young Jong ; Kang, Kap Seang ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 969~975
DOI : 10.12652/Ksce.2015.35.4.0969
In this paper, we review the regulations relating to railway safety and station workers interviewed, eight urban rail accidents decreased operating agencies through the prevention research currently being conducted into the (Seoul Metropolitan Rapid Transit Corporation City, Seoul Metro, Incheon traffic mortality, etc.) the root cause for the lack of aggressive prevention measures performed on the difficulties related regulations, organizational culture and work environment, prevention of negative operating authority derived in three improvements were obtained through this direction. First proposed urban railway safety ever buy Conduct production, utilization and operating agencies college safety assistant suggests directions for safety training, organizational culture and work environment improvements in senior management. Finally, active accident prevention campaigns, and provide direction to increase the educational participation of guests. Improvement for such accidents would decrease is thought to play a role in the prevention of future operating agency established when the guidelines.
A Study on Housing Affordability of Elderly Households According to Household Types and Housing Tenure
Kwon, Yeon Hwa ; Choi, Yeol ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 977~986
DOI : 10.12652/Ksce.2015.35.4.0977
The purpose of this study is to find the housing affordability of elderly household according to household types and housing tenure and to contribute to desirable elderly housing policies. The data from the 2010 Korea Housing Survey was used for the analysis of this study and the final sample included 6,780 elderly households. The results of this study are summarized as follows; It was found that all kinds of elderly household for housing affordability were affected by income, residence period, housing location and size of house. And housing location was a highly influential factor. Besides, female elderly house-owners and male elderly renters living alone were likely to have higher housing cost burden. And if elderly renters households suffer more financial burden, they had have higher housing cost burden. It is implies that desirable elderly housing polices by government need to consider elderly househod`s diverse characteristics in aged society.
A Study on Design Method depending upon Low Carbon Green Architecture of Big Medical Center
Kim, Jong Gu ; Park, Jong Min ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 987~996
DOI : 10.12652/Ksce.2015.35.4.0987
According to the recent research results of the Ministry of Environment, the indoor air quality of large general hospitals and university hospitals(58 hospitals) exceeded the maintenance standard. On top of such indoor air quality, it is also desperately required to have the environment-friendly building design and also low carbon green design in accordance with the increase of hospital size and enlarged hospital buildings. Especially, the increase of carbon dioxide, heat, garbage, waste energy, exhaust heat from power plants and sewage heat in each medical center brings up lots of problems to the health of hospital patients and customers. Thus this study aims to convergently develop the green environment-friendly architecture design technology concerning the organic relations between each medical building, and technical development which should be introduced to the low carbon green environment-friendly architecture design based on the characteristics of each medical center in large-scale medical complex.
Analysis of Urban Infrastructure Risk Areas to Flooding using Neural Network in Seoul
Kang, Jung Eun ; Lee, Moung-Jin ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 997~1006
DOI : 10.12652/Ksce.2015.35.4.0997
This study analyzed urban infrastructure risk to flooding based on the possibility map of flooding calculated by neural network model focusing on Seoul. This study found that Gangnam-gu, Songpa-gu, Seocho-gu and Seodaemun-gu contained relatively large high-risk areas to flooding. Over
of transportation facilities were located in high-risk area to flooding and Gangnam-gu included over
of infrastructures exposed to high inundation risk. This study is meaningful in that it first applied the neural network modeling to flooding risk assesment and results of risk assessment can be incorporated into various planning process.
Afforestation Effect Analysis Using MODIS Imagery: Yulin, Shaanxi, China As a Case Study
Jang, Hyo-Seon ; Kim, Sang-Pil ; Kim, Mi-Kyeong ; Sohn, Hong-Gyoo ;
Journal of The Korean Society of Civil Engineers, volume 35, issue 4, 2015, Pages 1007~1013
DOI : 10.12652/Ksce.2015.35.4.1007
Desertification in China, one of the source regions of yellow dust, has been worsen by industrialization and extreme land development, which increases the damage caused by yellow dust in Korea. Because the yellow dust from China affects not only their own country, but also neighboring countries, it is becoming an international problem, and China has been started afforestation projects to prevent excessive desertification with the help of the international community. However, it is only possible for identifying the results of afforestation projects to check afforestation result reports from National Bureau of Statistics of China, which makes it difficult to check out tangible results. Therefore, this study was conducted by using remote sensing technique for monitoring afforestation status of Yulin, shaanxi, China. in which an afforestation project has been carried out steadily. MODIS imagery was used as remote sensing data and it was confirmed that vegetation has been increased through vegetation indices from 2000 to 2014 and afforestation areas were estimated as same trend of ground reference data.