• Journal of the Society of Disaster Information
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• v.4 no.1
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• pp.10-31
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• 2008

Recently, 'Juvenile' is associated with the 'Misconduct', for it becomes an object of public concern. Therefore in this study, we suggest counterplan about the group traits connected juvenile-life intimately. First, parents promote conversation among the family and are concerned about their children. And they find out the problems in the bud to educate beforehand Second, the counterplan by school attaches great importance to individual contact. Third, in the counterplan on social aspects, adults' unwholesome ideas, bad effects of the mass communication, the lack of teenager's association, negative activity, leisure facilities and lack of opportunity for juveniles bring about negative facts for education of teenagers. Therefore we need positive counterplan to enlighten the young and purify the social environment. And the nation establish righteous values for the younger generation to not commit a crime and punish severely as well as must prepare the realistic and clear policy for the young to bear the responsibility for their role.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1209-1213
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• 2005

It reflects well feature of slope that is characteristic of city river basin of Pusan local. Process various hydrological datas and basin details datas which is collected through basin basis data. weather satellite equipment(EMS-DEU) and automatic water level equipment(AWS-DEU) and use as basin input data of ILLUDAS model, SWMM model and HEC-HMS model In order to examine outflow feature of experiment basin and then use in reservoir design of experiment basin through calibration and verification about HEC-HMS model. Inserted design rainfall for 30 years that is design criteria of creek into HEC-HMS model and then calculated design floods according to change aspect of the impermeable rate. Capacity of reservoir was determined on the outflow mass curve. Designed imagination reservoir(volume $54,000m^3$) at last outlet upper stream of experiment basin, after designing reservoir. It could be confirmed that the peak flow was reduced resulting from examining outflow aspect. Designing reservoir must decrease outflow of urban areas.

• International Journal of Safety
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• v.4 no.2
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• pp.36-42
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• 2005

A study on fire phenomena in a subway transit mass station has been carried out as a part of disaster prevention plan at the subway station. The ventilation facilities installed in both the platform and the trackway are designed to convert into a smoke exhaust system in emergency situation, creating an environment necessary for evacuation. 3 dimensional Numerical Simulations based on the CFD are carried out using a simulation tool, Fire Dynamic Simulator. Total of six different cases are made and performances are compared each other to find optimal vents operation to ensure safer environment for evacuation at the platform area considering the installation of platform screen door.

• Journal of the Society of Disaster Information
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• v.2 no.1
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• pp.129-137
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• 2006

The present work is attempt to evaluate the temperature dependence of blast furnace slag concrete(BFSC) based on the concrete strength cured with different curing temperatures and ages. A equivalent substitution index(ESI) was induced to explain temperature dependence of concrete quantitatively as well as concrete strength. The results from compressive strength showed substantial crossover effect. which is the phenomenon that the compressive strength cured at low temperature becomes stronger than the one cured at high temperature. The crossover effect found more definitely on BFSC than plain concrete.. The ESI became 1.1 and 1.0 for the BFSC cured at $20^{\circ}C$ and $30^{\circ}C$ after age of 56 days, respectively. Which means that the contribution to strength development of blast furnace slag per unit mass is stronger than that of the Portland cement. It was considered therefore that the optimum curing temperature for BFSC is $20^{\circ}C$.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2015.11a
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• pp.70-71
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• 2015

2011년3월에 발생한 동일본대지진에서는 일부지역에서 대규모 쓰나미 경보 사이렌의 고장 및 긴급시 사용하는 방조제 개폐장치의 고장 등, 상상외의 여러가지 일들이 발생하면서 그 피해가 더 커졌다. 이러한 사태를 바탕으로 대규모 지역에서의 피난 계획 및 시뮬레이션의 필요성이 최근에 대두되고 있다. 본 연구에서는 이러한 광역 피난계획을 풀기 위한 동적 네트워크 흐름 문제(dynamic network flow problem)를 적용한 방법론을 소개하고, 동적 네트워크 흐름 문제를 풀기 위한 일반적인 방법론 중 시간 확대 네트워크 문제 및 시간 확대 네트워크의 문제점인 계산시간을 해결하기 위한 고속연산 휴리스틱 알고리즘을 제시하고자 한다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.311-313
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• 2023

군중눌림 사고 형태의 재난은 국내에서 경험과 연구가 미진한 재난의 형태이지만 세계적으로는 선진국이나 후진국을 가리지 않고 꾸준히 발생중이며, 2022년 10월 29일의 이태원 참사에서 보듯이 국가사회에 엄청난 파급력과 영향을 주는 재난이다. 따라서 군중눌림 사고를 이해하고 발전된 학술적 접근 방식을 통하여 최소한의 예방, 대비, 대응 수준에 이르러야 하나 국내에서는 그 연구가 미진하고 용어와 개념 정립도 되어 있지 않다. 군중눌림 사고는 그 본질 상 얼마 안 되는 짧은 골든 타임 내에 해결이 되지 않으면 대처 시간이 거의 없어 인명피해 대처가 매우 어렵다. 즉 질식으로 의식이 저하되는 피해자가 신고되어도 현장 도착 구급대원이 밀집된 군중을 뚫고 피해자에게 신속히 접근하기란 애무 어려워, 선진국들조차도 많은 인명피해를 내지만 뚜렷한 한 가지 해결책을 제시 못하고 있는 형편이다. 이러한 상황에서 군중압박 사고 관련 정립되지 않은 용어를 관련 개념과 같이 조사 정리하고, 과거 있었던 대표적 군중집회의 분류, 특성 등을 알아보며, 이를 기반으로 용어와 개념이 정리 및 표준화되는 기반이 되도록 하였다.

• Journal of the Korean Society of Hazard Mitigation
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• v.5 no.3 s.18
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• pp.1-9
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• 2005

The primary source of disaster information for victims as well as ordinary people is mass media. In spite of their importance, the media often inaccurately portrays reality, which has stimulated academic debates. In Korea, however, media reporting patters of disaster have been hardly addressed. Therefore, the paper analyzes how newspaper and television news have reported typhoon Rusa between August 29 and October 1 in 2002 by using KINDS(Korean Integrated News Database System). The results show that television news tend to present more soft news stories emphasizing human interest stories than newspaper articles, relying on victims as primary interviewees. It is also pointed out that the Korean media do not play a significant role in providing disaster information to public regarding how to lessen the effects of impact through preparation. Disaster mythology representing wrong beliefs about human behavior in disaster is found in Korean media reporting, too. Unlike their western counterparts, however, Korean media seem to use the dependency image of helpless victims in order to stimulate donations. Analyses of disaster reporting patterns suggest that, in make disaster warning messages associated with behavioral responses, credible and official sources should provide clear and precise warning messages to the media, and the media also need to stress individual responsibilities in protecting his or her own properties not to make victims heavily dependent on public supports, while inducing donations.

• Water Engineering Research
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• v.2 no.2
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• pp.123-138
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• 2001

An injection experiment was carried ut to investigate the pressure domain within which hydromechanical coupling influences considerably the hydrologic behavior of a granite rock mass. The resulting database is used for testing a numerical model dedicated to the analysis of such hydromechanical interactions. These measurements were performed in an open hole section, isolated from shallower zones by a packer set at a depth of 275 m and extending down to 840 m. They consisted in a series of flow meter injection tests, at increasing injection rates. Field results showed that conductive fractures from a dynamic and interdependent network, that individual fracture zones could not be adequately modeled as independent systems, that new fluid intakes zones appeared when pore pressure exceeded the minimum principal stress magnitude in that well, and that pore pressures much larger than this minimum stress could be further supported by the circulated fractures. These characteristics give rise to the question of the influence of the morphology of the natural fracture network in a rock mass under anisotropic stress conditions on the effects of hydromechanical couplings.

• Journal of Korean Society on Water Environment
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• v.20 no.6
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• pp.641-646
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• 2004

Vehicle emissions from highway landuse include different pollutants such as heavy metals, oil and grease and particulates from fuels, brake pad wear and tire wear. Since highways are impervious and have high pollutant mass emissions from vehicular activity, it is considered as stormwater intensive landuses. Therefore this research was performed to understand the magnitude of first flush and to suggest the criteria of first flush for storm runoff management in highways. The fractions of washed-off mass are very high in first 30% of runoff volume, which suggests a definition of first flush. The washed-off mass stabilizes after 30% of the runoff volume and it is apparent that treatment capacity in the early part of a storm is more valuable than treatment capacity in the later part of the storm. Using the criteria of "high" first flush and "medium" first flush, as 50% of the mass in the first 30% of the volume, and 30 to 50% in the first 30% volume, respectively, more than 30% of the storms showed high first flush. A "first flush friendly" best management practice(BMP), meaning a BMP that can treat a high percentage or all of the initial flow, would be advantageous up to 80% of the events.

• The Journal of Engineering Geology
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• v.26 no.1
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• pp.143-152
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• 2016

To estimate the stability of a debris flow it is necessary to know the mass of surface soil, cohesion, slope, and friction angle. Given that the mass of surface soil is a function of soil thickness and mass density, it is important to obtain reliable estimates of soil thickness across a wide area. The objective of this paper is to estimate soil thickness using the elastic wave velocity with a new standard velocity. Tests are performed in debris-flow hazard areas, after which four profiles are selected to obtain the elastic wave velocity. Dynamic cone penetration tests are carried out to find the soil thickness at 18 points. The elastic wave velocity shows the area consists of 3~4 layers, and soil thicknesses are predicted by utilizing the new standard. The elastic wave velocity and dynamic cone penetration tests yield large differences in soil thickness. Therefore, this study shows that the new standard is useful not only in estimating soil thickness but also in improving the reliability of estimates of soil thickness.