• Journal of the Korea Society for Simulation
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• v.24 no.4
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• pp.59-68
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• 2015

In this paper, we proposed a methodology of vulnerability analysis for armored fighting vehicle based on modeling and simulation. The SES/MB framework serves hierarchical representation of the structure for a complex systems and is easy to conduct modeling for the armored fighting vehicle which consists of various components. When the armored fighting vehicle is hit by the shots from threat, the vulnerability of the armored fighting vehicle is decreased by damaged or penetrated level of armors and components. The penetration is determined by the result of comparing a penetration energy through penetration analysis equation and defence ability of armor and components. And the defence ability is determined in accordance with type and defined property of normal component and armor component, all components have a weighted values for the degree of importance. We developed a simulation program for verification proposed methodology. Thus, the program analyzes vulnerability for armored fighting vehicle SES/MB framework using importance.

• Korean journal of communication and information
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• v.48
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• pp.46-62
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• 2009

The current study attempted to review the standards of retransmisison consent and arbitration for the terrestrial broadcasting signal. The standards are based upon the principles encouraged by the MIAC(Ministry of Internal Affairs and Communications). It has been criticized that the standards of judgement for the retransimission consent and arbitration are ambiguous and arbitrary in Japan. In 2009, MIAC announced five decisions regarding the retransmission of over-the-air. The result of the current study found that the regulations of compulsory over-the-air signal retransmission have been sustained until now. The retransmission policy of the Japan government based upon three principles; localism, proper cause and copyright act. The judgment is dependent on the intrepretation of MIAC's standard about these three principles.

• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.103-119
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• 2018

This study explored news coverage on the sex crimes and analyzed news by network analysis and frame analysis based on the layered model to compare news coverage on the celebrity. As a result, in case of celebrity the broadcasting focused more and the tone of news is more sensational. The news in ground wave broadcasting more detailed on the sex crimes. It blamed the An, the governor of Chungnam more and the news is more sensational by interviewing marginal man. In #Metoo case, broadcasting news focused on the offender. The title of case name and the headline are framed based on the offender. Especially consensual relationship frame is dominated in the sex crime news. This study also can see the offender blaming frame and in the viewpoint of agenda-setting. It is difficult to find the cause of #Metoo movement and the structural approach on the case. This study highlighted the importance of layed model when analyzing the sex-crime news related with #Metoo movement.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.43 no.2
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• pp.156-165
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• 2015

A survivability-analysis program has been developed to analyze the ground collision risk of atmospheric reentry objects, such the upper stages of a launch vehicle or satellites, which move at or near the orbital velocity. The aero-thermodynamic load during the free fall, the temperature variation due to thermal load, and the phase shift after reaching the melting point are integrated into the 3 degree-of-freedom trajectory simulation of the reentry objects to analyze the size and weight of its debris impacting the ground. The analysis results of the present method for simple-shaped objects are compared with the data predicted by similar codes developed by NASA and ESA. Also, the analysis for actual reentry orbital objects has been performed, of which results are compared with the measurement data.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.4
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• pp.352-362
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• 2016

In this paper, a disposal maneuver which complies the space debris mitigation guideline was analysed for KOMPSAT-2 as an example of LEO satellite. Definition of disposal altitude which comply the '25 year rule', re-entry survivability analysis of KOMPSAT-2 parts inside and casualty area analysis were performed using STK and ESA's DRAMA. Finally, assuming that there were several survival objects during uncontrolled re-entry stage, the re-entry initial orbit elements which show the low casualty probability were found even if there were various uncertainties about the initial orbit. As a result, KOMPSAT-2 should be descended its altitude at least 43km or up to 105km to comply '25 year rule' and there were heavy or heat resistant survival objects which generated $4.3141m^2$ casualty area. And if RAAN of re-entry initial orbit was 129 degree, total casualty probability was lower than standard value of space debris mitigation guideline even if there were uncertainties about the initial orbit.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.289-295
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• 2024

This study analyzes the correlation between the accracy of rifle and the result of engagement. And estimates the improvement cost of the rifle accordingly. For this experiment, an engagement class simulation model(AWAM: Army Weapon Effectiveness Analysis Model) was used. We also selected the rifle, which is a portable weapon for the experiment. Prior to this experiment, we conducted a reliability test(VV&A: Verification, Validation and Accreditation) on the model. The VV&A process is mainly done during the development of the DM&S model, which is also necessary for the operation of the M&S. We confirmed the need for VV&A during the experiment and obtained reliable experimental results using the corrected values. In the Accuracy Experiment we found that the 20% improvement is the most effective. And we were able to estimate the cost of acquiring a rifle with a 20% higher accuracy. The cost was estimated by simple regression analysis based on the price of the current rifle. Through this study, we could know the impact of the accuracy of rifle on the experimental results and estimate the cost of improved rifle.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.5
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• pp.1-7
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• 2010

Since subway fire disaster at Daegu, Korea smoke control system and passengers evacuation distance has been focused to reform. Existing smoke control facilities need to expand volume of ventilation capacity however, the complicate subway station structure can hardly react dispersion of smokes from massive subway cabin fire. Smoke flow at platform level move upward thought vertical stairway and passengers evacuation goes with same direction. The victims of evacuees from subway station fire mainly due to exposure of heat radiation and smoke. The study demonstration the effect of downward evacuates stairway system by separating evacuation route to smoke movement pass way including saving times of evacuation.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.11a
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• pp.161-162
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• 2013

최근에 신축되는 주상복합건축물이나 대단위 아파트단지는 지상층에서 보면 각각이 독립되어 있는 별도의 소방대상물로 보이지만, 실제로는 지하층을 통하여 연결된 하나의 소방대상물이다. 이러한 건물의 지하층에서 화재가 발생하면 열이나 연기가 다른 동으로 확산되어 피해가 커질 수 있으며, 특정동의 소방펌프에서 고장이 발생하거나 우발적인 선로합선 등으로 인하여 수신기에 이상이 발생하면 전체 동에 설치된 소방시설이 정상적으로 작동되지 않는 경우가 발생하게 된다. 화재감지기의 신호에 따라 작동되는 제연댐퍼, 준비작동식 스프링 클러설비 등이 수신기에서 연동되는 과정을 인천송도에 위치한 글로벌주상복합 단지를 토대로 하여 소화 및 제연설비의 연동실태를 분석하였다.

• Aerospace Engineering and Technology
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• v.13 no.1
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• pp.184-192
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• 2014

In this paper, the lifetime of the artificial space objects in the LEO is analysed by using TLE data, which is provided by JSpOC. We observed the change of the number of space objects from 1957 and determined the reason of space debris generation. And then, we performed the analysis about present condition of space debris environment. The lifetime analysis includes a total of 11,792 artificial space objects and performed until the year 2050 by orbit propagation. We analyze the annual reentry frequency for the high RCS objects such as nonoperational satellites and rocket bodies, which have the possibility of earth ground impact through STK/Lifetime Tool for accurate and effective calculation. The results show that 9 payloads or rocket bodies will be decayed annually and 2 or 3 objects of total value have the possibility of ground impact. In addition, it is also shown that the 40% of a total analysed objects have the lifetime over 200 years.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.883-887
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• 2004

현재 전국적으로 $\blacktriangle$ 전기, 가스, 상수도, 하수도, 열수송관 등을 공동 수용하는 '지하공동구'가 14개 도시 30개소에 160.4km $\blacktriangle$ 보행공간으로 병용되는 '지하도로'가 23개도시 118개소에 63만 $m^2$ $\blacktriangle$ 지하도로내 설치된 지하점포가 1만1천798개소 23만$m^2$이 있다. 이와 같이 현대 도시내에서 지상공간의 과밀도 개발로 인하여 지하공간의 수요가 증대되어 지하공간 구조물이 많이 설치되고 있는 반면, 지하상가, 지하천 등과 같은 지하공간 시설에서 발생할 수 있는 침수피해 대책이 미흡한 실정이다. 본 연구에서는 과거 지하공간의 침수피해 실태를 조사하고 그 사례에서 원인을 분석하여 기술적 해결책을 도출해 내며, 침수방지를 위한 대책으로 국내에서 사용하고 있는 기숙이나 국외(미국, 일본)의 침수방지 기술 및 대책, 침수시 가이드라인 등을 조사하였다. 또한 지하공간이 침수되었을 때 일어날 수 있는 위험성에 대하여 이론적인, 기술적인 조건에 대하여 조사하였다. 이를 토대로 지하공간의 유형 즉, 지하주택, 지하상가, 지하공공시설(지하차도, 지하철, 전철, 지하변전소)에 대한 구체적인 침수방지 기숙에 대한 기준을 제시함으로써 궁극적으로는 지방자치단체, 관련기관, 연구기관에서 지하공간 침수방지대책에 대한 기초자료로 활용할 수 있을 것으로 판단된다.