• Journal of Korean Society of Disaster and Security
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• v.6 no.3
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• pp.1-8
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• 2013

Based on random vibration theory, a procedure for calculating the dynamic response of the tall building to time-dependent random excitation is developed. In this paper, the fluctuating along- wind load is assumed as time-dependent random process described by the time-independent random process with deterministic function during a short duration of time. By deterministic function A(t)=1-exp($-{\beta}t$), the absolute value square of oscillatory function is represented from author's studies. The time-dependent random response spectral density is represented by using the absolute value square of oscillatory function and equivalent wind load spectrum of Solari. Especially, dynamic mean square response of the tall building subjected to fluctuating wind loads was derived as analysis function by the Cauchy's Integral Formula and Residue Theorem. As analysis examples, there were compared the numerical integral analytic results with the analysis fun. results by dynamic properties of the tall uilding.

• Journal of Korean Society of Disaster and Security
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• v.8 no.1
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• pp.5-13
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• 2015

In this study, the lateral overflow discharge coefficients for the curvatures of side weir on meandering channel were analyzed. The side weir installed in accordance with the variation of the radius of curvature of the central angle bends with $180^{\circ}$. FLOW-3D model is applied to calculate the discharge coefficients of the side-weir on meandering and straight channels and the characteristics of the discharge coefficients are analysed. In order to verify the numerical model, the results from the hydraulic experiment conducted by the former research are compared with the results simulated by FLOW-3D in the same conditions. The discharge coefficients are calculated for the ratio between curvature ($R_c$) and channel width (b), and the ratio between over flow discharge of the straight channel ($Q_{wc}$) and the meandering channel ($Q_{wc}$) are compared. As the result, the discharge coefficients depend on the weir depth on upstream, and the radius of curvature, so that the discharge coefficients of side weir on the meandering channel can be estimated by them on the straight channel.

• Journal of Korean Society of Disaster and Security
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• v.8 no.1
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• pp.39-46
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• 2015

This study is concerned with the estimation of fluctuation wind velocity spectrum and turbulence characteristics in the major cities reflecting the recent meteorological with typhoon wind velocity about 2003 (Maemi) 2010 (Kompasu) 2012 (Tembin). The purpose of this paper is to present spectral analysis for longitudinal component fluctuating velocity obtained by Monte Carlo Simulation method. In the processes of analysis, the longitudinal velocity spectrums are compared widely used spectrum models with horizontal wind velocity observations data obtained at Korea Meteorological Adminstration (KMA) and properties of the atmospheric air for typhoon fluctuating wind data are estimated to parameters with turbulency intensity, shear velocity, probability distribution and roughness length.

• Journal of Korean Society of Disaster and Security
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• v.6 no.1
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• pp.1-8
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• 2013

Walking is one of human functions and has been the base of the development of human civilization. Walking ability had made the first village and urban pattern of the mankind. Cities had been constructed for pedestrian's convenience and happy life. But conventional cities have been crowded by the rapid increasing vehicles and population since material civilization had developed. On the other hand, pedestrian space has been neglected urban districts. Chose this study to suggest a direction for improvement by following the direction of the city characteristics and roadside pedestrian space. 1. Investigate the relationship and the significance and problems of pedestrian space by finding survey of the literature and discussion with those that affect the behavior of the pedestrian environment around. 2. For a comfortable pedestrian space on the improvement of the pedestrian area of space (physical and psychological) and gait characteristics, service levels and basic data. 3. Chose how to extract the most appropriate of the best alternatives presented several proposals based on the above survey of the literature data and field survey.

• Journal of Korean Society of Disaster and Security
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• v.6 no.2
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• pp.49-56
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• 2013

In this paper, used by the boundary layer wind tunnel test, have conducted a series of wind tunnel experiments, i.e. test the mean velocity profile regarding the surface roughness, turbulence intensity and power spectrum measured by augmentation device. After that, to provide data relevant for the preliminary design step of tall building hazard fluctuating wind loads may be obtained fluctuating pressure coefficients, fluctuating pressure spectrum, autocorrelation coefficients by the boundary layer wind tunnel test. From the results of experiments, this study can be obtained conclusions as follows. 1. We know the fact that the mean velocity profile and the turbulence intensity are well fitted natural wind flow in the boundary layer wind tunnel. 2. The satisfactory agreement of velocity spectrum can be obtained from the compare of fluctuating power spectrum and Von Karman spectrum. 3. We know the fact that the fluctuating pressure spectrums distributed peak at 0.01 Hz-0.1 Hz in the windward surfaces and at 0.1 Hz in the leeward surfaces. 4. We know the fact that the autocorrelation coefficients distributed stationary random processes with application time of hazard fluctuating wind loads.

• Journal of Korean Society of Disaster and Security
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• v.6 no.2
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• pp.23-30
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• 2013

A dynamic analysis of random vibration processes is concerned with the first excursion probability based on first passage time during some specified lifetime or duration of the excitation. This study is concerned with the estimation of first-passage probability for hazard fluctuate wind velocity in the major cities reflecting the recent meteorological with largest data samples (yearly 2003-2012). The basic wind speeds were standardized homogeneously to the surface roughness category C, and to 10m above the ground surface. In this paper, the hazard fluctuate wind velocities are treated as a time-independent (stationary) random process and Gaussian random processes. The first excursion probability were calculated from Poisson model based on the independent event of level crossing & two-state Markov model based on the envelopes of level crossing.

• Journal of Korean Society of Disaster and Security
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• v.6 no.2
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• pp.15-22
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• 2013

Recently, 'Government 3.0' has become the topic since the inauguration of the new government. According to Government 3.0 Promotion Master Plan, this means providing bilateral customized administrative service based on the values of opening-up, sharing, and cooperation for the individuals of the people. Currently, if disaster victims, who have private property damaged by natural disasters such as typhoon and torrential rain, want to receive disaster relief service supports such as financial support, tax cut, reduction in electric and communication charges, they have to visit each of applicable organizations and apply for the relief service supports. The application forms and procedures are so diverse and complex that disaster victims undergo many discomforts. So this thesis established the solution of residents' discomforts and the providing of practical benefits through disaster victims' one stop application for service as the research objective. Accordingly, the solution plan was concretely presented through preparing the relief service promotion strategies comprising the establishment of administrative service supporting system and the preparation of legal and institutional device, the establishment of computing system for one stop service and the reinforcement of general publicity for successful promotion of cooperation projects.

• Journal of Korean Society of Disaster and Security
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• v.6 no.2
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• pp.9-14
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• 2013

Major accidents such as typhoon, tsunami, and chemical accidents have been continuously occurred. In this environment, Technical Commitment (TC) related to disaster management part in the International Organization for Standardization (ISO) concentrates their efforts to enact the business continuous management in emergency situation for international standard. As a result of TC223, four international standards are enacted in 2011, 2012. In the Korean industrial standard, two international standard (ISO22300, ISO22301) out of four standards were enacted in 2012. This study analyzes a recent trend and proposes a method activating of international societal security standard for chemical accidents. Disaster certificate system for developing disaster safety industry is suggested. We hope each related organization could develop our disaster safety management policy and research based on this study.

• Journal of Korean Society of Disaster and Security
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• v.6 no.2
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• pp.1-8
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• 2013

This study is concerned with the estimation of fluctuate wind velocity statistic properties in the major cities reflecting the recent meteorological with largest data samples (yearly 2003-2012). The basic wind speeds were standardized homogeneously to the surface roughness category C, and to 10m above the ground surface. The estimation of the extreme of non-Gaussian load effects for design applications has often been treated tacitly by invoking a conventional wind design (gust load peak factor) on the basis of Gaussian processes. This assumption breaks down when the loading processes exhibits non-Gaussianity, in which a conventional wind design yields relatively non conservative estimates because of failure to include long tail regions inherent to non-Gaussian processes. This study seeks to ascertain the probability distribution function from recently wind data with effected typhoon & maximum instantaneous wind speed.

• Journal of Korean Society of Disaster and Security
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• v.6 no.1
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• pp.73-78
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• 2013

This study aims to develop Drowning Management Index (DMI) to evaluate the effectiveness of drowning management in a region. In order to develop practical index to evaluate drowning management, downing contributors are examined. Drowning exposure rate is collected by survey. DMI is generated from South Korea and Australia for comparison. South Korea and Australia indicate similar number of drowning per 100 thousand people (1.7 South Korea, 1.4 Australia) but in DMI it turned out 9 times difference between two countries (15.5 South Korea, 1.67 Australia).