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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 7, Issue 5 - Dec 2007
Volume 7, Issue 4 - Oct 2007
Volume 7, Issue 3 - Aug 2007
Volume 7, Issue 2 - Jun 2007
Volume 7, Issue 1 - Mar 2007
Selecting the target year
A Study on Durability Variation of Concrete due to Water Content Changes
Woo, Young-Je ; Ryu, Hwa-Sung ; Jung, Sang-Hwa ; Kwon, Ki-Jun ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 1~6
When the water content within concrete swells, diverse problems occur such as drop in durability. Due to this reason, a change is being managed in the unit water contents by using electric capacity measurements, high frequency heating methods, and unit-volume mass measurements, which are methods of measuring the unit water contents. Particularly, Japan is prescribing the guideline of management on a change in unit water content unit quantity
. However, the guideline of Japan dose not consider a fall in durability, and is decided on the value of pass-fail criteria by random fabrication errors and measurement errors. Consequently, this study was aimed to investigate the influence of a change In water content within concrete due to an addend caused by management error and to an artificial addend, upon drop in durability.
A Study on the Investigation of Demander's Consciousness for Standardization and Information of Construction Materials
Choi, Young-Jun ; Cho, Young-Keun ; Kwon, Ki-Jun ; Chae, Seong-Tae ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 7~12
This study has been conducted to present reform recommendations for Standardization of Construction Materials, based on a study on the Investigation of Demander's Consciousness for Construction Materials Quality and Information Standardization in Korea. Upon investigation, it was found that the quality of Korea Industrial Standards (KS) was given 67 points (out of 100) by respondents. In addition, 38% of the respondents showed that they had problems with a lack of Standardized Information. Good examples were found to be non-standardized materials, e.g. admixtures, waterproof agents, reinforcing fibers, concrete, aggregates, adhesives, wood, temporary materials, thermal-insulating materials, etc. Upon results from the investigation of demander's consciousness for infrastructure of standardization of information, 71.2% of respondents thought that it is necessary to informatize construction materials. They made following demands on the informatization to be, in order: Quality, Standard, Price (Cost), Operation, Drawing, Law, and Information.
A Derivation of Regional Representative Intensity-Duration-Frequency Relationship Using Multivariate Analysis
Lee, Jung-Sik ; Cho, Seong-Geun ; Jang, Jin-Uk ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 13~24
This study is to derive the rainfall intensity formula based on the representative probability distribution using multivariate analysis in Korea. The annual maximum rainfall data at 57 stations having more than 30years long records were used for 12 durations(10min, 1, 2, 3, 4, 5, 6, 8, 10, 12, 18, 24hr). 50 rainfall characteristics elements are analyzed from the collected data. The widely used 14 probability distributions are applied to the basic data in hydrologic frequency analysis. The homogeneous tests(principal component and cluster analysis) are applied to find the rainfall homogeneity. The results of this study are as followings; (1) The homogeneous test shows that there is no appropriate representative distribution for the whole duration in Korea. But hydrological homogeneous regions of point rainfall could be divided by 5 regions. (2) The GEV distribution for zones I, III, IV, V and the Gumbel distribution for zone II are determined as the representative probability distribution. (3) Comparative analysis of the results shows that the probable rainfalls of representative zones are different from those of existing researches. (4) Rainfall intensity formulas are determined on the basis of the linearization technique for the probable rainfall.
A Study on Foreign Cases for the Management of Extreme Heat Response Plan in Korea
Kim, Ji-Young ; Kim, Jung-Ok ; Yu, Ki-Yun ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 25~33
In most developed countries, Extreme heat alter system operates every summer and the response plan to be issued according to this system is composed of some government agencies sub-plans. The National Emergency Management Agency in Korea develops response plan but it is not composed of the definition of the heat vulnerability and the concrete agency roles. Therefore, this study analyses foreign cases in three processing: preparedness, response, recovery and reviews the status of heat response plan. As a conclusion, the study suggests two ways of Extreme heat management into Korean heat response plan such as strengthening its institutional position and complementing its context.
Mechanical Properties of Controlled Low Strength Materials with Marine Dredged Soil
Kim, Ju-Deuk ; Lee, Byung-Sik ; Lee, Kwan-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 35~44
Plowable fill is generally a mixture of sand, fly ash, a small amount of cement and water. Sand is the major component of most flowable fill mixes. Marine dredged soil was adopted for flowable fill instead of fly ash. Natural sea sand and in-situ soil were used for comparison. The flow behavior, hardening characteristics, and ultimate strength behavior of flowable fill were investigated. The unconfined compression test necessary to sustain walkability as the fresh flowble fill hardens was determined and the strength at 3-days appeared to correlate well with the water-to-cement ratio. The strength parameters, like cohesion and internal friction angle, was determined along the curing time. The creep test for settlement potential was conducted. Also, potable falling weight deflectometer(PFWD) test has been carried out for elastic modulus of each controlled low strength materials(CLSM). The data presented show that marine dredged soil and in-situ soil can be successfully used in CLSM.
Numerical Simulation of Flood Inundation with Quadtree Grid
Kim, Jong-Ho ; Kim, Hyung-Jun ; Lee, Seung-Oh ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 45~52
In this study, the flood inundations of the Nam River catchment running through the Uiryeong and Haman regions have been simulated using the numerical model based on quadtree grids. The nonlinear Saint Venant equation is employed as the governing equation for a numerical model in this study. The governing equations are discretized explicitly with a finite difference leap-frog scheme on adaptive hierarchical quadtree grids. Results from this study are compared with those of established numerical models such as the HEC-RAS and the FLUMEN. A numerical model is also simulated according to the frequency variations of flood event. Obtained numerical results show good agreements with them of commercial models. It is found from this study that the flood inundations in the studied area can be occurred at a 500 year frequency event.
A Study on the Evaluation of Probable Snowfall Depth in Korea
Lee, Jae-Joon ; Jung, Young-Hoon ; Lee, Sang-Won ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 53~63
This study is to evaluate the probable snowfall depth by the point frequency analysis and to draw the map of probable snowfall depth in Korea. The 14 probability distributions which has been widely used in hydrologic frequency analysis are applied to the annual maximum depth of snowfall data. The parameters of each probability distribution are estimated by method of moments, maximum likelihood method and method of probability weighted moments. The estimated parameters were checked by parameter validity conditions of each assumed probability distribution. Four tests that are
, Kolmogorov-Smirnov test, Cramer von Mises test and probability plot correlation coefficient test are used in this study to determine the goodness of fit of the distributions. Mostly the 2-parameter gamma distribution was determined as appropriate distribution for the annual maximum new snowfall depth. The probable snowfall depth were obtained from appropriate distribution for the selected return periods and the maps of probable snowfall depth were presented. It will be useful to specify the snowfall load for the design of agricultural facilities such as vinyl house and cattle shed.
Estimation of the Water Surface Slope by the River Bend Curvature and Flood Discharge
Choi, Han-Kuy ; Lee, Mun-Hee ; Baek, Hyo-Sun ; Park, Soo-Jin ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 2, 2007, Pages 65~71
In this research, we made a one and two-dimensional analysis of numerical data collected from the bend curvature of a bended river section. According to the result from the numerical analysis, the inflow & output angle caused a water level deviation which increased with an increase of the flood discharge. From the water level deviation of our two-dimensional numerical model, we obtained the maximum slope of 6,67% when the inflow and output angle was 105 degrees and the flood discharge was 500 CMS. As for the right side, the differences with the one-dimensional numerical model were reduced when the angle was more than
. As for the left side the differences were reduced when the angle was more than
. For a river with more than 90 degrees bend curvature, a hydraulic experiment would be more appropriate than a numerical analysis.