• Title/Summary/Keyword: 방호기법

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Educational Needs Analysis of General Security Jobs in Physical Protection Field using the DACUM Technique (DACUM기법을 활용한 물리적방호 분야 일반보안 직무의 교육 요구분석)

  • Lee, Jin Gu;Jung, Il Chan;Park, Min Ju
    • The Journal of the Korea Contents Association
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    • v.21 no.5
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    • pp.234-246
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    • 2021
  • The purpose of this study is to develop the main subjects of the job-based curriculum by deriving the job analysis results of general security job workers in the physical protection field responsible for responding to threats to nuclear materials and nuclear facilities. In the job analysis stage, FGI was conducted on 7 content experts to derive 8 duties and 55 tasks. In addition, knowledge and skills were drawn for each task. In the analysis of educational needs, surveys were conducted for workers in general security jobs to derive the top 25 educational priorities through t-test and Borich needs assess model. At the stage of selecting core tasks and organizing required/optional contents, 42 tasks, both above average or at least one of them, were derived as core tasks based on the result of evaluation of importance and difficulty ratings of 55 tasks through a questionaire. In addition, tasks applied to the top 25 rankings derived from Borich needs assess model were applied as the required contents when designing courses, and tasks which applied only one of them were selected as optional contents. At the stage of required/optional modules and educational contents, four required modules and five optional modules were derived by drifting similar tasks between the required and optional contents. Based on the above results, the study suggested academic and practical implications and future suggestions.

Measurement of natural frequency of aluminum honeycomb sandwich beams using high speed digital cameras (고속 디지털 카메라를 이용한 알루미늄 하니콤 샌드위치 보의 고유 진동수 계측)

  • Goo, Nam Seo;Vang, Hoang My;Le, Vinh Tung;Jin, Tailie
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.1
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    • pp.30-35
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    • 2017
  • In this study, we measured the natural frequencies of aluminum honeycomb sandwich beams using digital image correlation technique. The vibration images were captured using two high speed digital cameras and the images were converted to displacements by the digital image correlation technique. Displacement data in time domain were tranformed to frequency domain data by fast Fourier transform software. To reduce noise invoked by random exitation, a spectrum averaging technique and Savitsky-Golay digital filter were adopted. A conventional vibration measurement using an accelerometer and a finite element analysis were performed to compare the results by high speed digital camera measurement method. In conclusion, new method using high speed digital cameras and digital image correlation technique can measure the vibration of beam structures and can be applied to bio-structures where sensors cannot be attached.

Development of damage assesment of concrete compression member subjected to impact load using Bayesian probabilistic method (Bayesian 통계방법을 이용한 충격하중을 받는 콘크리트 압축부재의 손상평가의 개발)

  • Kim, Seung-Pyo;Yi, Jong-Gil;Yi, Na-Hyun;Kim, Jang-Ho;Lee, Kang-Won
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.161-162
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    • 2010
  • In this study, the impact load on concrete compression member was considered to assess the quantitative damage index. The case study was carried out using the LS-DYNA, on explicit finite element analysis program. The parameters for the case study were impact load angle, slenderness ratio, etc. Using the analysis results, the performance based design method for impact load was developed using Bayesian probabilistic method, which can be applied to reinforced concrete column design for impact loads.

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Analysis of Penetration Phenomenon of High Altitude Electromagnetic Pulse into Buried Facilities with Various Moisture Content and Depth (수분 함유량 및 지하 구조물 깊이에 따른 고고도 전자기파(HEMP) 투과 현상 분석)

  • Kang, Hee-Do;Oh, Il-Young;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.6
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    • pp.644-653
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    • 2013
  • In this paper, a formulation for obliquely incident electromagnetic wave has been presented for an analysis of highpower electromagnetic pulse penetration into multilayered dispersive media. Based on generalized models of measured dielectric constants and propagation channels reflecting the Earth's general features, the propagation phenomenon of the obliquely incident early-time(E1) high altitude electromagnetic pulse(HEMP) is analyzed. In addition, the polarization and critical angle are also considered. It is found that the total reflection occurs at an incident angle of about 38 degrees at the soil-rock interface, and that the parallel-polarized E1 HEMP penetrates better than the perpendicular-polarized one. The peak level of the penetrating electric field is found to be 5.6 kV/m at normal incidence, regardless of the type of polarization, and E1 HEMP is greatly reduced near the critical angle. Moreover, the penetrating E1 HEMP is analyzed as a variation of moisture content and depth of materials, resulting E1 HEMP could be useful in determining the levels of shielding required for buried facilities.

Simulation and Analysis of Response Plans against Chemical and Biological Hazards (화학 생물 위험 대응 시뮬레이션 및 분석)

  • Han, Sangwoo;Seo, Jiyun;Shim, Woosup
    • Journal of the Korea Society for Simulation
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    • v.30 no.2
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    • pp.49-64
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    • 2021
  • M&S techniques are widely used as scientific means to systematically develop response plans to chemical and biological (CB) hazards. However, while the theoretical area of hazard dispersion modeling has achieved remarkable practical results, the operational analysis area to simulate CB hazard response plans is still in an early stage. This paper presents a model to simulate CB hazard response plans such as detection, protection, and decontamination. First, we present a possible way to display high-fidelity hazard dispersion in a combat simulation model, taking into account weather and terrain conditions. We then develop an improved vulnerability model of the combat simulation model, in order to simulate CB damage of combat simulation entities based on other casualty prediction techniques. In addition, we implement tactical behavior task models that simulate CB hazard response plans such as detection, reconnaissance, protection, and decontamination. Finally, we explore its feasibility by analyzing contamination detection effects by distributed CB detectors and decontamination effects according to the size of the {contaminated, decontamination} unit. We expect that the proposed model will be partially utilized in disaster prevention and simulation training area as well as analysis of combat effectiveness analysis of CB protection system and its operational concepts in the military area.

Vessel Collision Analysis of an Underwater Slope using Coupled Eulerian-Lagrangian Scheme 1: Development of Analysis Model (Coupled Eulerian-Lagrangian 기법을 이용한 선박의 수중사면 충돌해석 1 : 해석모델의 개발)

  • Lee, Gyehee
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.33 no.1
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    • pp.17-23
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    • 2020
  • In this study, the behaviors of a vessel and the ground during the vessel impacting an underwater slope that is part of an artificial protective island are analyzed using the coupled Eulerian-Lagrangian scheme. To consider the large deformation including the shear failure of soil, the Eulerian domain is used to model the ground and water, while the impacting objects are modeled as the Lagrangian domain. For efficiency, the mass scaling scheme is applied to the modeling of the impacting objects, and the ground is modeled by setting the Eulerian volume fraction values. To verify the applicability of the constructed model, a dynamic penetration anchor problem is analyzed. The impacting vessel is modeled using solid elements following the external shape of a container ship, and an analysis of a collision on the slope is performed. As a result, collision behaviors such as displacement, velocity, and dissipation energy are estimated, and the necessity of a parametric study as further research is established.

A Study on the Detection of Defects from Parallel Cylindrical Objects Using Spectral Analysis of Acoustic Impact Signal (타격음 주파수 분석법에 의한 원통 병렬 구조물의 파손 여부 식별에 관한 연구)

  • Bang, Ho-Gyun;Jo, Cheol-U
    • The Journal of the Acoustical Society of Korea
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    • v.14 no.4
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    • pp.12-20
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    • 1995
  • This paper describes principles and experimental results in conjunction with examining the possibility of the detection of effects from a cylindrical objects. Cylindrical objects have its own resonance frequency. The frequency varies according to the diameter, length etc. And acoustic sound, whose frequency and the harmonic components corresponding to resonance frequency, is radiated from the object. When an object have defect in itself, the radiated acoustic sound is different from normal one. So we can detect its defect by analysing frequency components of acoustic sound. We proved that detection of defective objects by acoustic signal analysis is possible automatically. Also the result can be applied to other kinds of objects.

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A Study on Service Quality and Switching Costs of Instant Messenger Service Users (인스턴트 메신저 서비스 이용자의 서비스 품질과 전환비용에 관한 연구)

  • Kim, Seong-Ho;Bang, Ho-Yeol
    • Journal of Global Scholars of Marketing Science
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    • v.15 no.1
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    • pp.1-20
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    • 2005
  • The object of this study is to explore factors affecting customer satisfaction and customer loyalty of instant messenger service. We propose that service qualities (tangibility, assurance, responsiveness, empathy, reliability) affect customer satisfaction of instant messenger service, customer satisfactions do customer loyalty. As moderating factors of the relationship between customer satisfaction and customer loyalty, switching costs are suggested. To accomplish the object of this study data are collected from instant messenger user by survey research. We analyse the research model using structural equation model and moderated multiple regression. The result are as follows: (1) tangibility and responsiveness affect customer satisfaction. (2) customer satisfaction affects customer loyalty. (3) switching costs moderated the relationship between customer satisfaction and customer loyalty.

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Development of Fire Ignition Frequency Calculation program Using NUREG/CR-6850 Method (NUREG/CR-6850 방법론을 적용한 화재점화빈도 계산 프로그램 개발)

  • Ho, Myoung-Soo;Lee, Jang-Youn;Kang, Dae-Il
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2012.04a
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    • pp.109-112
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    • 2012
  • 원자력발전소는 타 산업시설에 비해 화재발생 가능성이 낮으나 방사성물질 누출가능성을 최소화하기 위하여 심층방어와 다중방호 설계를 통한 안전성확보가 매우 중요하다. 이를 위해 국내에서는 화재위험도분석(FHA)과 안전정지능력분석(SSA) 및 화재 확률론적안전성분석(Fire PSA)을 수행하고 있으며, 이 중 화재 PSA는 주요 화재구역 선별, 구역별 화재발생빈도 및 기기손상확률 계산, 화재사고 경위분석 및 화재취약성 파악 등을 분석한다. 본 논문에서는 미국 원자력규제위원회(USNRC)와 전력연구소(EPRI)가 공동 연구개발한 화재 PSA 방법론인 NUREG/CR-6850 기법을 적용하여, 화재 PSA에 필요한 화재점화빈도(Fire Ignition Frequency)를 정량적으로 계산하였다. 정확한 결과값을 도출하기 위해 매크로를 이용한 프로그램인 FIFA(Fire Ignition Frequency Analyzer)를 개발하였으며, 향후 국내 원전 화재 PSA 분석업무에 유용하게 사용될 수 있을 것으로 기대된다.

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A Study of Environment & Bullet-Proof Capability Test Method for KLTV's Transparent Armour (한국형 전술차량 방탄유리 환경 및 방호력 시험 적용 기법 연구)

  • Park, Jinwon;Park, Youngchan;Kim, Seonjin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.1
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    • pp.69-73
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    • 2018
  • Korean-peacekeeper's transparent armors in Iraq showed delamination, cracking and clouding a decade ago. And there were also similar deterioration recurrences in KLTV during the operational test a few years ago. Also, the differences between operational capability & lab Bullet-proof test condition, and insufficiency of military protection spec resulted in incomplete bullet-proof results. Moreover, although so many ground weapon systems have been developed, there were not secure test & evaluation codes to verify transparent armoured glasses equal to advanced-overseas products. So in this study, first, environmental test codes were established that all tests should be carried out as the application of only one specimen with newly adopted thermal shock test instead of completing each test with different one. Second, protection standards were integrated through the analysis of global developed country's specifications and reinforced as adding to the real mock-up condition if vehicle's glasses are smaller than standard specimen. Hereby, by applying to test-codes which including actual operational & vehicular conditions, the gap between development test and operational environment was minimized.