• Proceedings of the Korea Water Resources Association Conference
• /
• 2007.05a
• /
• pp.1224-1229
• /
• 2007

최근 들어 기상이변으로 집중호우가 발생하여 막대한 홍수피해를 야기하고 있으며, 2003년 발생한 태풍 매미는 전국적으로 엄청난 피해를 유발하였다. 낙동강 유역에서는 이 기간동안 유입유량이 단기간에 집중적으로 유입하는 양상을 나타냈으며, 특히 남강유역 및 밀양강의 유입량 규모는 예년 홍수규모에 비해서 상당히 큰 유입량이 발생하여, 제방과 저수지가 붕괴되어 수많은 재산피해를 남겼다. 이에 건설교통부에서는 낙동강 유역종합치수계획을 수립, 검토하여 유역의 항구적인 수해방지를 위한 방안을 마련하고자 하였다. 본 연구에서는 낙동강 하구둑부근의 치수종합대책(안) 중 우안배수문의 확장방안($47.5{\times}9.2{\times}6$련)에 대하여 홍수위저감효과를 분석함으로써 향후 치수방재대책수립에 만전을 기하고자 하였다. 홍수위 저감효과 분석시 선정된 수리특성분석 모형으로는 유한요소법에 기반을 둔 RMA-2모형의 범용프로그램인 SMS 모형을 이용하였으며, 상류단의 경계조건으로는 유역종합치수계획과 동일한 200년빈도 설계홍수량 조건을 선정하였고, 보다 정확한 분석을 위해 낙동강 하구둑 하류 10km지점에 위치한 명지 조위관측소의 예측조위를 하류단의 경계조건으로 이용하였다. 분석결과 최대수위 발생시간은 대조기 창조시인 약 60시간 후이고, 하구둑 우안배수문을 확장할 경우 하구둑 내측수위가 최대 약 1.32m 저감되는 것으로 나타났다.

• Journal of Korea Spatial Information System Society
• /
• v.12 no.1
• /
• pp.57-65
• /
• 2010

In this study, disaster damage investigation system was developed using high resolution satellite images and GIS technique to afford effective damage investigation system for widely disaster damaged area. Study area was selected in Bonghwa, Gyungsangbukdo where high magnitude of damages from torrential rain has occurred at July in 2008. GIS DB was built using 1:5,000 topographic map, cadastral map, satellite image and aerial photo to apply for investigation algorithm. Disaster damage investigation system was developed using VB NET languages, ArcObject component and MS-SQL DBMS for effective management of damage informations. The system can finding damaged area comparing pre- and post-disaster images and drawing damaged area according to the damage item unit. Extracted object was saved in Shape file format and overlayed with background GIS DB for obtaining detail information of damaged area. Disaster damage investigation system using high resolution spatial images can extract damage information rapidly and highly reliably for widely disaster areas. This system can be expected to highly contributing to enhance the disaster prevention capabilities in national level field investigation supporting and establishing recovery plan etc. This system can be utilized at the plan of disaster prevention through digital damage information and linked in national disaster information management system. Further studies are needed to better improvement in system and cover for the linkage of damage information with digital disaster registry.

• Journal of Wetlands Research
• /
• v.17 no.3
• /
• pp.237-244
• /
• 2015

This study is estimated the flood damage probability of the flood discharge, the flood stage estimation and Economic Analysis for Flood Control about considering of uncertainty. Sum River Basin has chosen and the probability precipitation is estimated by using the concept of critical rainfall duration depending on the frequency of each flood stage estimation point. For calculating the expected annual damage, the functions of long term hazard, discharge-frequency, stage-discharge and depth-damage are established for 8 areas in Sum River Basin. The expected annual damaged is obtained which is based on the sampling informations through more than 500,000 simulation from the functions of considered uncertainty. The result about the optimum frequency and Investment Priorities are estimated by conducting the evaluation about planning the levee of various of Design Frequency. In analysis result, 12% of B/C value has increased if the uncertainty has concerned. Also the optimum frequency or Investment Priorities are possible to be changed. If the political and social analysis perform together it would be helpful to have a reasonable decision other than only the economical analysis as actual Flood damaged reduction planning.

• Journal of Digital Convergence
• /
• v.15 no.9
• /
• pp.15-21
• /
• 2017

Our current study aimed to verify the mediating effect of growth mindset and grit in the relationship between human rights victimization and self-esteem. The survey was conducted on 233 college students. Reliability analysis, correlation analysis, and Macro Process were performed, and bootstrap method was used to verify the mediating effect of growth mindset and grit. The results were as follows. First, human right victimization were significantly and negatively correlated with self-esteem, growth mindset, and grit while self-esteem were significantly and positively correlated with growth mindset, and grit. Second, as a result of path analysis, the human rights victimization had a significant negative impact on self-esteem, growth mindset and grit. On the other hand, growth mindset and grit had a significant positive effect on self-esteem. Third, growth mindset and grit had a mediating effect in the relationship between human right victimization and self-esteem. This implied that self-esteem of college students can be increased by increasing their growth mindset and grit. Future research is needed to clarify the role of human rights research and growth mindset and self - esteem in college students.

• Journal of Korea Water Resources Association
• /
• v.53 no.9
• /
• pp.637-646
• /
• 2020

The shallow landslide-trigerred debris flow in hillslope catchments is the primary geological phenomenon that drives landscape changes and therefore imposes risks as a natural hazard. In particular, debris flows occurring in urban areas can result to substantial damages to properties and human injuries during the flow and sediment transport process. To alleviate the damages as a result of these debris flow, analytical models for flow and damage prediction are of significant importance. However, the analysis of debris flow model parameters is not yet sufficient, and the analysis of the entrainment, which has a significant influence on the flow process and the damage extent, is still incomplete. In this study, the effects of erosion and erosion process on the flow and the impact area due to the change in the soil parameters are analyzed using Deb2D model, a flow analysis model of debris developed in Korea. The research is conducted for the case of the Mt. Umyeon landslide in 2011. The resulting impacted area, total debris-flow volume, maximum velocity and inundated depth from the Erosion model are compared to the field survey data. Also, the effect of the entrainment changing parameters is analyzed through the erosion shape and depth. The debris flow simulation for the Raemian and Shindong apartment catchment with the consideration of entrainment effect and erosion has been successful. Each parameter sensitivity could be analyzed through sensitivity analysis for the two basins based on the change in parameters, which indicates the necessity of parameter estimation.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.23 no.4
• /
• pp.253-265
• /
• 2020

As the risk of landslide is recently increasing due to the typhoons and localized heavy rains, effective techniques for the landslide damage detection are required to support the establishment of the recovery planning. This study describes the analysis of landslide-damaged areas using ISODATA(Iterative Self-Organizing Data Analysis Technique Algorithm) with Sentinel-2 image, regarding the case of Gokseong in August 7, 2020. A total of 4.75 ha of landslide-damaged areas was detected from the Sentinel-2 image using spectral characteristics of red, NIR(Near Infrared), and SWIR(Shortwave Infrared) bands. We made sure that the satellite remote sensing is an effective method to detect the landslide-damaged areas and support the establishment of the recovery planning, followed by the field surveys that require a lot of manpower and time. Also, this study can be used as a reference for the landslide management for the CAS500-1/2(Compact Advanced Satellite) scheduled to launch in 2021 and the Korean Medium Satellite for Agriculture and Forestry scheduled to launch in 2024.

• Korean Journal of Remote Sensing
• /
• v.38 no.5_2
• /
• pp.765-779
• /
• 2022

This study evaluates the accuracy in identifying the burned area in South Korea using multi-temporal data from Sentinel-2 MSI and Landsat 8/9 OLI. Spectral indices such as the Difference Normalized Burn Ratio (dNBR), Relative Difference Normalized Burn Ratio (RdNBR), and Burned Area Index (BAI) were used to identify the burned area in the March 2022 forest fire in Uljin. Based on the results of six indices, the accuracy to detect the burned area was assessed for four satellites using Sentinel-2 and Landsat 8/9, respectively. Sentinel-2 and Landsat 8/9 produce images every 16 and 10 days, respectively, although it is difficult to acquire clear images due to clouds. Furthermore, using images taken before and after a forest fire to examine the burned area results in a rapid shift because vegetation growth in South Korea began in April, making it difficult to detect. Because Sentinel-2 and Landsat 8/9 images from February to May are based on the same date, this study is able to compare the indices with a relatively high detection accuracy and gets over the temporal resolution limitation. The results of this study are expected to be applied in the development of new indices to detect burned areas and indices that are optimized to detect South Korean forest fires.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.10
• /
• pp.2329-2334
• /
• 2012

In this paper, we performed a study of damage assessment model development to analyze the initial nuclear pulse radiation damage to semiconductor devices for military weapon systems. At first we modeled(M) the nuclear pulse radiation and diode device, and simulated(S) the output characteristics of the device to the input. Then the manufactured diodes which had the same characteristics with the modeled one were irradiated to the similar pulsed type radiation and their output signals were measured simultaneously. Error between the M & S results and the measured values of the analysis was 22.9%. Through the error value we could confirm that the damage assessment model simulated the TREE effects with a quite accuracy.

• The Journal of the Korea Contents Association
• /
• v.16 no.12
• /
• pp.267-280
• /
• 2016

The purpose of this study was to examine the effects of adolescent victimization on human rights consciousness and the mediating effects of depression and evaluation on their own human rights among adolescents. A total of 3,662 middle school student data from '2014 Korean Children and Youth Human Rights Survey' were used for the study. This study analysed a hypothesized research model using structural equation modeling. The main findings on structural model are as follows: First, victimization did not have a direct influence on human rights consciousness but had an indirect effect through a mediating role of evaluation on their own human rights. Secondly, victimization were related to human rights consciousness through double mediating paths of depression and evaluation on their own human right. Finally, human rights education, a control variable, had an indirect effect on human rights consciousness through self-evaluation on human rights. The results of this study suggest some implications for practical intervention and further research on the relation between adolescent victimization and human rights consciousness.

• The Journal of the Korea Contents Association
• /
• v.17 no.9
• /
• pp.268-280
• /
• 2017

This study was conducted to analyze the moderating effect of self-expression and attitude toward help on the relation between interpersonal relationship and bullied experience among adolescents. Participants were 316 junior and highschool students in Seoul and Namyangju, Gyeonggi-do during May-June, 2014. As a result of analyses, first, the interpersonal relationship and self-expression had significant negative impact on bullied experience. Second, there was no significant correlation between attitude toward help and bullied experience. Third, self-expression had a significant moderating effect on the relationship between interpersonal relationship and bullied experience. Specifically, high self-expression weakened the negative influence of interpersonal relationship on bullied experience. Fourth, there was no significant moderating effect of attitude toward help on the relation between interpersonal relationship and bullied experience. Based on these results, we discussed the importance of self-expression for prevention of bullying among adolescents.