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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 9, Issue 6 - Dec 2009
Volume 9, Issue 5 - Oct 2009
Volume 9, Issue 4 - Aug 2009
Volume 9, Issue 3 - Jun 2009
Volume 9, Issue 2 - Apr 2009
Volume 9, Issue 1 - Feb 2009
Selecting the target year
Quantitative Evaluation of Escape Safety Considering Extension of Escape Time by Escape Distance and Escape Barrier
Jeong, Gun-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 1~7
Escape distance and escape barrier are critical elements for the quantitative evaluation of escape safety. Through theoretical demonstration and modeling in precedent studies, they have been analyzed for their generality and applicability. To make more practical evaluation method, we should quantitatively analyze the influence of each barrier and escape condition on escape safety considering various barriers in escaping routes. In this study, to develop more accurate and applicable escape analysis model, we have focused on three research methods as below: First, we derived quantified function to predict various escape barriers in escaping routes by theoretical analyses of the escape barriers and conditions. Second, we substituted the derived quantified function for an evaluation tool of escape safety suggested by precedent studies. Third, we examined applicability and feasibility of the developed method by modeling with the consideration of the escape conditions and barriers.
Verification of Damage Detection Using In-Service Time Domain Response
Choi, Sang-Hyun ; Kim, Dae-Hyork ; Park, Nam-Hoi ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 9~13
Modal parameters including resonant frequencies and mode shapes are heavily utililized in most damage identification throries for structural health monitoring. However, extracting modal parameters from dynamic responses needs postprocessing which inevitably involves errors in curve-fitting resonants as well as transforming the domain of responses. In this paper, the applicability of a damage identification method based on free vibration responses to the in-sevice responses is experimentally verified. The experiment is performed via applying periodic and nonperiodic moving loads to a simply supported beam and displacement responses are measured. The moving load is simulated using steel balls and a downhill device. The damage identification results show that the in-service response may be applicable to identifying damage in the beam.
Assessment and Recommendation of Fatigue Design Codes for Stud Shear Connectors in Composite Bridge
Lee, Kyoung-Chan ; Yoon, Ki-Yong ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 15~21
The design of the stud shear connector of a bridge structure is mostly controlled by the fatigue resistance not by the strength, if it is followed by AASHTO LRFD Bridge Design Specification. This fatigue design code in AASHTO LRFD is based on the research work done by Slutter and Fisher in 1966. These tests seemingly underestimated the fatigue resistance of connectors because of the inherent eccentricity of the one-face test setup which results additional tension forces to the stud. In addition, the stress ranges were not plotted in the log scale, because it was not known at that time that the fatigue resistance of the welded steel structures has a linear relationship of log scales of stress range and number of loading cycles. This study evaluates the test data produced by the Slutter and Fischer, and plot the data on the proper manner. The fatigue push-out test data produced recently by many other researches all around the world are gathered and analyzed, furthermore a design curve is recommended.
An Experimental Study on Punching Shear of Simplified Composite Deck
Yoon, Ki-Yong ; Lee, Sung-Yol ; Yi, Gyu-Sei ; Kim, Sang-Seup ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 23~30
According to Korea Highway Bridge Design Code the bridge deck is designed by the strength design method and is regarded as a beam possessing the unit width based on the bending theory. By many researches it is revealed that the existing bridge deck is failed by punching shear. For evaluating the ultimate capacity of bridge deck it is important to estimate the behavior of bridge deck under the punching shear. For the punching strength it is difficult that the existing research results are applied to the simplified composite deck. In this study for comparing characteristics on punching shear the punching shear tests on simplified composite deck and RC deck are performed. The punching shear strength of simplified composite deck is compared with several bridge design codes.
The Estimation of Durability Factor of Deteriorated Jointed Concrete Pavement Using Image Analysis Test
Choi, Pan-Gil ; Kim, Yong-Gon ; Yun, Kyong-Ku ; Kwon, Soo-Ahn ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 31~38
The primary objective of this study was to estimate the deterioration degree of jointed concrete pavement which was major concrete pavement type in Korea. First of all, visual survey of concrete pavement was performed to observe deterioration types. In the result of visual survey, the majority of concrete pavement deterioration was investigated in joint area. It is appeared that most of the distresses are durability cracking and joint distress. Second, concrete core specimens were taken from eight locations including good section (4 locations) and bad section (4 locations) based on visual survey. The deterioration reasons of concrete pavement were analyzed with ultrasonic pulse velocity test, splitting tensile strength test, and image analysis for concrete core specimens. Among the image analysis test result for 21 concrete core specimens, only two specimens satisfied the Kansas DOT criteria of spacing factor,
, and the remains of 19 specimens were estimated to be above
. The durability factor of concrete was estimated very low. As a result, it was analyzed that the main deterioration reason of the deteriorated jointed concrete pavement was to be freezing and thawing damages.
A Study on the Roles of Local Disaster Response Organizations
Kwon, Gun-Ju ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 39~46
The purpose of this study is to compare and analyze the organizations for responses in disaster fields to cope with large-scaled disasters including Emergency Management Agency, Emergency Response Unit, Emergency Support Center, and Field Command Center (Field Command Office). According to the results of the analysis, the problems of the organizations for responses in local disaster fields are; 1) the scopes of roles among the organizations for responses in disaster fields are ambiguous, 2) the structures of the organizations for responses in disasters are different each other, 3) the integrated management functions among the organizations for responses in disasters are overlapped, and 4) the one who assumes the integrated command is not defined. In order to improve the problems, first, the range of working of each organization for responses in local disaster fields should be definitely established and an agreement in services among the organizations should be settled in advance. Second, similar designs in the structure among the organizations for responses in disasters are necessary for amicable communication. Third, the works for integration and management for each organization for responses should be apportioned. Fourth, the organization in charge and the one who assumes the integrated command for each type of disasters should be appointed in advance for rapid decision-making.
A Study on Vitalizing a Project for Building a Disaster Resistant Community to Enhance Local Disaster Prevention
Kwon, Gun-Ju ; Han, Ki-Won ; Baek, Min-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 47~56
The following improvement plans are suggested in this study to facilitate implementing a pilot project for building a disaster resistant community organized by the National Emergency Management Agency in 2008, and ultimately to expand the project nation-wide. Regarding legislative aspects, legal grounds should be established such as devising a new clause in the Counter Measure for Natural Disaster for assigning a disaster resistant community or city, and devising a tentatively named "Act for Disaster Resistant Community Project" as a local governance regulation. Regarding administrative aspects, a project master plan focused on active participation of the local residents should be designed. Moreover, a certain amount of the project budget should be alloted not only to structural contents but also to non-structural contents. Regarding organizational aspects, an education program for training local disaster prevention leaders should be actively promoted and a local disaster prevention governance system should also be established among official and inofficial local organizations. Furthermore a preemptive consulting system with disaster prevention experts as well as an evaluation system to monitor the project implementation process should be introduced.
A Study on the Flame Tilt and Flame Spread due to Up-slope on the Surface Fuel Bed - No wind condition -
Kim, Dong-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 57~62
Flame spread velocity to virgin surface fuel bed on a ground slope increases as the flame gets closer to the slope according to the change of a ground slope angle. The existing studies have generally adopted the theory that flame gets closer to the slope as the slope angle increases, without considering the change of flame tilt against the slope. In this study, experiments were made on the actual characteristics of the flame on slopes of various angles, and as a result, this study offers the flame tilt equation according to the slope angle, and derive correlation between flame tilt and flame spread velocity on slope conditions.
A Study on Foam Mixing Characteristics in Steady State to Enhance the Performance of Proportioner for Foam System
Ku, Jae-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 63~68
This study describes to analyze foam mixing characteristics in steady state to enhance the performance of proportioner for foam system designed to accurately proportion a foam liquid concentrate into a water stream up to constant concentration. The proportioner developed is experimentally evaluated in performance evaluation system consisted of a pump, tanks, pressure gauges, flow meters, a nozzle. As a result, the foam mixing performance of the line proportioner is found to increase with increased the water flow rate due to the venturi effect and with increased the cross-sectional area of the orifice and is analysed with 3 % in the error rate of
. For the pressure proportioner, the foam mixing performance is analyzed to increase with increased the water flow rate and with increased the inlet pressure and is analysed with 3% in the error rate of
Numerical Analysis of Concrete Lining and Rockbolt Behavior of the Tunnel Associated with Blast-induced Vibration
Jeon, Sang-Soo ; Jang, Yang-Won ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 69~78
Since the blast vibration induced by explosives of the powder possibly provide damage of the nearby structures adjacent to the tunnel, the stability of the nearby structures should be estimated. In this study, the stability of the tunnel based on the allowable peak particle velocity of the structures as well as allowable stress of the structures presented in the concrete structural design standard was estimated with respect to the stress of the concrete lining and axial force of the rockbolt during the blasting operation at the ground surface of the pre-existing tunnel. The analyses were carried out by using
which is one of the programs developed based on the finite difference method. The bending compressive stress and shear stress of the concrete lining and axial force of the rockbolt were rapidly increased when the blasting operation was conducted near the tunnel.
Load Transfer Characteristics of the 7-wire strand using FBG Sensor Embedded Smart Tendon
Kim, Young-Sang ; Suh, Dong-Nam ; Kim, Jae-Min ; Sung, Hyun-Jong ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 79~86
With the substantial increase of the size of structure, the management of excavation becomes more difficult. Therefore, massive collapses which are related to retaining wall recently increase. However, since the study on measuring and monitoring the pre-stressing force of anchor is insufficient, behavior of anchor may not be predicted and monitored appropriately by the existing strain gauge and load cell type monitoring system. FBG Sensor, which is smaller than strain gauge and has better durability and does not have a noise from electromagnetic waves, is adapted to measure the strain and pre-stressing force of 7-wire strand, so called smart tendon. A series of pullout tests were performed to verify the feasibility of smart tendon and find out the load transfer mechanism around the steel wire tendon fixed to rock with grout. Distribution of measured strains and estimated shear stresses are compared with those predicted by theoretical solutions. It was found that developed smart tendon can be used effectively for measuring strain of 7-wire strand anchor and theoretical solutions underestimate the magnitude of shear stress and load transfer depth.
Analysis of Regional Flood Damage Characteristics using Relationship between Flood Frequency and Damages
Park, Tae-Sun ; Choi, Min-Ha ; Yeo, Chang-Geon ; Lee, Seung-Oh ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 87~92
It has been considered only with the concerned regional damage costs whenever the restoration and flood control measures were established in Korea. If the relationship between regional flood frequency and damages is quantitatively analyzed, more resonable and reliable countermeasure for flood protection and restoration can be proposed. Historical data ('70~'07) about flood damage in Korea were utilized and analyzed to present such relationship using the point frequency analysis. Also, the quadrant analysis was employed to divide into 4 categories: high frequency-high damage, high frequency-low damage, low frequency-high damage, and low frequency-low damage. If the results from this study were utilized well in specific cities and counties in Korea, it would be helpful to establish the countermeasures and action plans for flood protection because it was possible to compare with the relationship between flood frequency and damage of each region. And it would be the fundamental data for estimating the effect of future flood protection plan.
Prediction of Stream Flow on Probability Distributed Model using Multi-objective Function
Ahn, Sang-Eok ; Lee, Hyo-Sang ; Jeon, Min-Woo ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 93~102
A prediction of streamflow based on multi-objective function is presented to check the performance of Probability Distributed Model(PDM) in Miho stream basin, Chungcheongbuk-do, Korea. PDM is a lumped conceptual rainfall runoff model which has been widely used for flood prevention activities in UK Environmental Agency. The Monte Carlo Analysis Toolkit(MCAT) is a numerical analysis tools based on population sampling, which allows evaluation of performance, identifiability, regional sensitivity and etc. PDM is calibrated for five model parameters by using MCAT. The results show that the performance of model parameters(cmax and k(q)) indicates high identifiability and the others obtain equifinality. In addition, the multi-objective function is applied to PDM for seeking suitable model parameters. The solution of the multi-objective function consists of the Pareto solution accounting to various trade-offs between the different objective functions considering properties of hydrograph. The result indicated the performance of model and simulated hydrograph are acceptable in terms on Nash Sutcliffe Effciency*(=0.035), FSB(=0.161), and FDBH(=0.809) to calibration periods, validation periods as well.
Analysis of Precipitation Distribution in the region of Gangwon with Spatial Analysis (I): Classification of Precipitation Zones and Analysis for Seasonal and Annual Precipitation
Um, Myoung-Jin ; Jeong, Chang-Sam ; Cho, Won-Cheol ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 103~113
In this study, we separated the precipitation zones using the geographic location of stations and precipitation characteristics (monthly, seasonal, annual) in Gangwon province. Precipitation data of 66 weather stations (meterological office: 11 locations, auto weather system (AWS): 55 places) were used, and statistical method, K-means cluster method, was conducted for division of the precipitation regions. As the results of regional classification, the five zones of precipitation (Yongdong: 1 region, Youngseo: 4 regions) were separated. Seasonal average precipitation in spring is similar throughout Gangwon Province, seasonal average precipitation in summer has high values at Youngseo, and seasonal average precipitation in autumn and winter have high values at Youngdong. The some areas, the vicinity of Misiryeong and Daegwallyeong, happens the orographic precipitation in spatial analysis, but the orographic effects didn't occur for the whole Gangwon areas. However, to achieve more accurate results, the expansion of observatories per elevation and AWS data are demanded.
The Study on the Integrated Monitoring of Water Quantity and Quality Data
Yi, Jae-Eung ; Kim, Mun-Mo ; Park, Sung-Je ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 115~123
Integrated information to water quantity and quality is essential for planning water resources management as well as operating water-related infrastructures. Because data collection process including monitoring and maintenance is separated in different governmental agencies in Korea, integrating quantity and quality may provide effective and better management implementation. In this study, a number of suggestions regarding integration of water monitoring were concluded in terms of technological, legal and institutional implications. First, it is necessary to discuss national water monitoring plan, national water information management plan, agreement of standard terms of monitoring between ministries, and to revise the law(river law and water quality management law). Present stations for water monitoring should be used for both of quantity and quality monitoring. If station is newly installed or relocated, it is better that one single agency maintain monitoring frequency and data management as well. In addition, a monitoring protocol need to be agreed by each of parties. In order to develop integrated monitoring system, quality assurance of the collected data should be properly maintained. Since many purposes haven been concerned using of data analysis and assessment so far, it may not be easy to integrate water quantity and quality monitoring in a short period. However, the alternatives including enhancing institutional regulations and programs, advanced technology may promote an efficient integrated water monitoring.
Development of Empirical Formulas for Storage Function Method
Choi, Jong-Nam ; Ahn, Won-Shik ; Kim, Tae-Gyun ; Chung, Gun-Hui ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 125~130
Storage function method which considers the non-linearity of the relationship between rainfall and runoff has been frequently used to predict runoff in a basin and a flood pattern. However, it is time-consuming to estimate appropriate parameters of every basin and rainfall event, which requires the empirical parameter equation applicable in Korea. In this study, multiple regression analysis is used to develop empirical equations to estimate parameters of Storage Function method using basin characteristics. The basin area, maximum stream length, and stream slope are considered as the basin characteristics as the result of the regression analysis. Collinearity is removed and trial-and-error method is used to choose the most descriptive parameters to the dependent variables in Han River basin which is divided into 30 subbasins. The developed equations are validated using the rainfall events in MunMak gauging station and named as 'Han River equation'. The equation could provide the useful information about Storage Function method parameter to calculate runoff from a basin and predict river stage.
A Warning and Forecasting System for Storm Surge in Masan Bay
Han, Sung-Dae ; Lee, Jung-Lyul ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 131~138
In this paper, a dynamic warning system to forecast inland flooding associated with typhoons and storms is described. The system is used operationally during the typhoon season to anticipate the potential impact such as inland flooding on the coastal zone of interest. The system has been developed for the use of the public and emergency management officials. Simple typhoon models for quick prediction of wind fields are implemented in a user-friendly way by using a Graphical User Interface (GUI) of MATLAB. The main program for simulating tides, depth-averaged tidal currents, wind-driven surges and currents was also vectorized for the fast performance by MATLAB. By pushing buttons and clicking the typhoon paths, the user is able to obtain real-time water level fluctuation of specific points and the flooding zone. This system would guide local officials to make systematic use of threat information possible. However, the model results are sensitive to typhoon path, and it is yet difficult to provide accurate information to local emergency managers.
Analysis of Soil Vacuum Extraction using Analytical Solution of Groundwater Flow
Kim, Min-Hwan ; Lee, Hak ; Han, Dong-Jin ;
Journal of Korean Society of Hazard Mitigation, volume 9, issue 5, 2009, Pages 139~145
An analytical solution of groundwater flow is applied to design soil vacuum extraction for removing volatile organic compounds from the unsaturation zone. The governing equation of gas or vapor flow in porous media is nonlinear in that gas density depends on gas pressure. A linear equation suggested by researcher is similar to that of groundwater flow. The pressure drawdowns of confined and leaky aqufiers are calculated using Massmann's field data, and the pressure drawdowns are compared. A solution of Theis equation calculated by Massmann is modified using GASSOLVE9 program in this paper. The pressure drawdown using Hantush's analytical solution for leaky aquifer also compared to that of Massmann. Hantush's analytical solution gives good approximations to pressure drawdown.