• Journal of Korean Society of societal Security
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• v.2 no.2
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• pp.69-74
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• 2009

The purpose of this research is to assess the aseismic safety for the large-sized waste landfill site based on the results from liquefaction potential analysis. For successful achievement of research, the simplified liquefaction analysis and detailed liquefaction analysis using data from lab test and seismic response analysis are executed. Based on the simplified liquefaction analysis, the possibility of liquefaction is occurred at only BH-14 with maximum acceleration 0.169 g. Therefore, liquefaction possibility of BH-14 is evaluated by the detailed liquefaction analysis again. The safety factor greater than 1.0 from the result of analysis at BH-14 guarantees safety of liquefaction.

• Journal of Korean Society of societal Security
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• v.1 no.4
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• pp.51-56
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• 2008

Because of our country's climate that has the 50% of the annual precipitation in summer, annually a lot of bridges on the roads are broken in this season. So, we need an accelerated bridge construction method that complete to repair the roads. This paper introduces the Hangae 2 bridge, prefabricated bridge using full depth precast deck panels and new types of PSC girders. The Hangae 2 bridge located in lnje-gun, kangwon-do. This is a good example of the accelerated bridge construction method for recovery of flood damaged road. The PSC girder bridge system introduced in this paper is a rapid construction method for bridge that can reduce the term of works over 50%.

• Journal of Korean Society of societal Security
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• v.1 no.4
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• pp.57-64
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• 2008

Korea has been suffered from serious damages of lives and properties, due to landslides that are triggered by heavy rains in every monsoon season. This study developed the physically based landslide prediction model which consists of 3 parts, such as slope stability analysis model, groundwater flow model and soil depth model. To evaluate its applicability to the prediction of landslides, the data of actual landslides were plotted on the areas predicted on the GIS map. The matching rate of this model to the actual data was 84.8%. The relation between hydrological and landform factors and potential landslide were analyzed.

• Journal of Korean Society of societal Security
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• v.2 no.4
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• pp.75-81
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• 2009

This paper presents the geotechnical characteristics of tunnel co \l apse based on the case studies. For domestic cases, most collapses are likely to happen along the weakest zone of shear strength due to the change of stresses induced by excavation specially when soft or weathered rock exist in front of a tunnel. In other words, the collapse of a tunnel occurs along the highly weathered fractured zone due to blasting and excavation. In Europe, collapses have been occurred by one joint group even though the ground is relatively fresh and for the rocks of which RQD is over 50%. In addition, the amount of ground water flow does not seem to be seriously affected by the RQD range.

• Journal of Korean Society of societal Security
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• v.2 no.3
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• pp.25-30
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• 2009

The magnitude and frequency of international disaster recovery aids and supports by the United Nations and other donor countries to least developed countries are increasing due to the emerging risks such as super typhoons and consequently worsened impacts by those disasters. With emergency recovery aids, systems for disaster mitigation and preparedness are also needed to the countries hit by disasters. Through the KOICA programs, the Korean government is trying to establish an effective disaster support system for disaster-hit countries. This study reviews current post-disaster aid systems of various countries and international organizations and proposes improved disaster aid system for the Korean government. The improved system can be used in the assistance of effective and enlarged international recovery activities promoting Korean government's status in the international disaster management society.

• Journal of Korean Society of societal Security
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• v.2 no.3
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• pp.39-46
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• 2009

A small loop-loop multi-frequency electromagnetic(EM) induction method is a useful technique to map a resistivity distribution efficiently and non-destructively. However, for quantitative interpretation and depth sounding, the quality of measured data is crucial. In this paper, we propose a bias correction of measured data by using background noise measurements to obtain reliable data, and propose an evaluation technique of apparent that can provide a resistivity image easily. We have performed small loop-loop EM measurements to detect water saturation in a man-made test site. The application of our proposed techniques to the measured data was successful.

• Journal of Korean Society of societal Security
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• v.1 no.3
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• pp.83-91
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• 2008

Most construction information is being recorded in the form of electronic document. However, design documents generated in current practice are not suitable in share and exchange of information for disaster management. This study proposes how to develop th e XML Schema based semantic model of structural calculation document (SCD) for systematic storage and management of SCD information. in addition, 5 basic data types are developed for various expression forms appeared in the structural calculation documents. A prototype semantic model for steel bridge superstructure is developed based on the proposed method, and it is observed that the proposed method can be effectively used to build a standardized semantic model of SCD.

• Journal of Korean Society of societal Security
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• v.4 no.2
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• pp.49-56
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• 2011

The hydroxide precipitation method is appropriate to distinguish free metal ions with complexed metal ions with amino acids. Optimum pH conditions of hydroxide precipitation were investigated using mixed amino acids which have similar composition ratio with hydrolyzed amino acids. When applied to soil samples immobilities of Hg, Cr, and Cu ion with mixed and hydrolyzed amino acids were reasonable. But those of Cd and Zn were not sufficient.

• Journal of Korean Society of societal Security
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• v.1 no.1
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• pp.53-62
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• 2008

Recently, the potential risks of tank lorry transportation from the petrochemical plant have been increasing, so the research was performed to build up the evaluation criterion of the transportation safety, as well as aggressive risk+assessment of a variety of chemical materials. This research was applied to the Maximum Credible Accident Analysis technique and modeled on the risk management of chemical transportation using the following four steps for risk evaluation, firstly the comparison of representative fype and standard of hand ling chemical materials transported by tank vehicles secondly, specific classification of potential hazards thirdly, grasp and recognition of virtual accident scenario at last, the risk evaluation of virtual accident scenario(qualitative/quantitative - chemical release modeling).

• Journal of Korean Society of societal Security
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• v.4 no.1
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• pp.49-55
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• 2011

The primary objective of this paper is to develop optimal algorithms of reinforced concrete frame structural systems by the limit state design(CP 1110) and to look into the possibility of detailed design of these structural systems. The structural formulation is derived on the finite element method. The objective of optimization of a reinforced structure for a specified geometry is mainly to determine the optimum cross-sectional dimensions of concrete and the area of the various sizes of the reinforcement required for each member. In addition to the detail s such as the amount of web reinforcement, cutoff points of longitudinal reinforcedments etc. are also considered as design variables. In this study, the method of "Generalized Reduced Gradient, Rounding and with Neighborhood search" and "the Sequential Linear Programming" are employed as an analytical method of nonlinear optimization.