• Journal of Korean Society of Disaster and Security
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• v.9 no.1
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• pp.25-32
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• 2016

Technical development have broaden human activity ranges and make human possible to defend the disasters which was undependable in the past. However, human's space activity brought a new kind of disaster to human. In the past, natural space objects was the only concern from the space, like the asteroid fallen on Chelyabinsk, Russia. But, nowadays, by the increasing number of the man-made space objects, these space kind of threat have diversified and become very real. So, nationwide safety strategy should be established to protect the people. In this paper, we suggest three points to make the decision for establishing the strategy based on the AHP analysis results.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.461-471
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• 2017

지난 2017년 1월 17일, 우리나라는 재난 및 안전관리기본법의 자연재난에 우주물체의 추락 충돌로 인한 재난을 포함시켰다. 이는 '14 진주운석 추락 등 잇따른 우주재난에 대한 국제적 관심고조 및 이에 대한 대비의 필요성 제기 등이 바탕이 된 것으로, 우주재난에 대한 국가적 관리의 필요성이 현안에 반영된 결과이다. 한편, 기존정책의 범위가 축소되거나 확장되는 등 변화가 발생할 때 해당 정책이 효과적으로 집행되기 위해서는 정책의 실질적 집행 효과를 경험하는 대상이 되는 정책적 고객이 정책의 변경내용을 인지하고 해당 정책에 대하여 공감하는 것이 중요하다. 우주재난의 경우 재난 및 안전관리기본법에 기존에 포함되어있던 기타 자연재난과 비교할 때, 그 위험도나 피해정도 등이 대중에게 어떠한 평가를 받고 있으며, 특히 기타 자연재난과 비교할 때 같은 맥락으로 이해되고 있는지를 파악하여 향후 세부 정책에 반영할 필요가 있을 것으로 판단된다. 이에 본 연구에서는 "우리나라 국민의 우주위험인식 수준과 국가 재난정책"의 후속연구로서 2016년 9월 발생한 경주지진 전 후 자연재난에 대한 국민의 인식에 변화가 있는지를 분석하여 이를 토대로 우주재난에 대한 국민의 인식을 설명하고 정책적 시사점을 제시하고자 한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.3
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• pp.280-287
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• 2010

The first Korean satellite launch vehicle, KSLV-I(Korea Space Launch Vehicle-I), was launched for its first flight test on Aug. 25, 2009 from Naro Space Center located in south Jolla province. Because launch vehicles usually fly long range with large amount of propellants aboard, preparation of countermeasures against potential malfunctions during flight is essential in launch operation. In this paper, the flight safety operation, prepared to guarantee flight safety during launch operation of KSLV-I, is presented. Prior to flight test, flight safety analysis is performed to estimate associated risk levels quantitatively, and during flight, flight safety systems are operated to cope with any risky situations. Real-time flight monitoring including computation of instantaneous impact point using tracking data is executed normally and the flight test is completed without activation of flight termination system.

• The Optical Journal
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• s.142
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• pp.23-26
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• 2012

천문학계는 더 멀리 있는 천체나 더 어두운 천체를 관측하기 위하여 부단히 노력하고 있다. 이로써 우리 주위를 맴돌고 있는 위험한 물체를 사전에 찾아내어 대비하고 외계에 생명체가 있는지 조사하며 우주의 전체 모습과 역사를 파악하고자 한다. 이를 위하여 더욱 더 크고 성능 좋은 망원경을 개발해 왔다. 광학망원경 분야에서는 1990년대에 구경 8~10m급 망원경을 건설하였으며, 이후 차세대 거대망원경을 개발하고 있다. 망원경 분야는 미터 급의 초대형 광학의 수준을 넘어 이제는 수십 미터 급의 거대 광학으로 발전하고 있다.

• Journal of Aerospace System Engineering
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• v.17 no.6
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• pp.46-53
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• 2023

As urban traffic congestion and environmental pollution are becoming significant issues in major cities, Urban Air Mobility (UAM) is gaining attention as an efficient solution. In this study, we conducted a geographic information system (GIS)-based spatial analysis and clustering algorithm considering the actual data of the terrain and infrastructure in the Busan area, through which we were able to select the location of vertiports and corridors (flight routes) for the UAM operation. Based on the Gimhae International Airport, which is expected to be the center of the UAM infrastructure system in the Busan region, we judged that three vertiport locations in the target area were suitable. Subsequently, we used the A^* (A-star) algorithm considering Ground Risk to select a flight path that minimized both risk and distance. Through this, we confirmed a risk reduction effect of 80.168% compared to the minimum distance route.

• The Korean Journal of Air & Space Law and Policy
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• v.26 no.1
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• pp.241-269
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• 2011

Solar flare and storm may give an adverse effect upon electromagnetic environment around the Earth, so that various kinds of satellite cease to normally function. This kind of space storm disaster is characterized by the uncertainty about when and what size. Recently the UN has been paying attention to this plausible disaster. Particularly the COPUOS has taken the view that this disaster would threaten the sustainable space environment. The precautionary principle, rooted and excercised in the environment protection filed, has been adopted in the case of disaster with uncertainty. The reports and opinions given by the expert and representatives of the member States have stated that the precautionary principle should be adopted for the purpose of dealing with this disaster. On the other hand, it is advanced that the principle has been already included in the space law principle enshrined in the 1967 Space Treaty. The Treaty has adopted the freedom of navigation and use of the outer space for the interest of all States as the basic principles. Sustainable environment is necessary for implementing the principle. Therefore, the rules for the protection of sustainable space environment should be based upon the space law principle.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1047-1048
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• 2009

인공위성은 전자와 양자들로 인한 방사현상, 위치에 따른 온도변화 및 진공에 의한 영향 등 극한 우주 환경에서 동작하므로 항상 위험에 노출되어 있다. 특히 저궤도 관측위성은 지구와의 통신이 제한적이기 때문에 위성에 문제가 발생할 경우 신속한 대응이 어려워 질 수 있다. 따라서 위성을 설계할 때에 다양한 오류 상황을 예상하고 이에 대비하여 비상 시 운영 가능한 방안을 마련해야 한다. 본 논문에서는 소프트웨어적인 비상 운영 방법을 제안한다. 위성에서 발생하는 오류를 기록하여 지상으로 전달하는 방법과 긴급한 문제가 발생 하였을 경우 주요 파라 미터를 확인하여 위성에서 조치를 취할 수 있는 방법에 대해 소개하도록 하겠다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.6
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• pp.605-611
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• 2010

The geostationary satellite COMS is going to be launched in 2010, and, in the series of test, there are some high-pressure tests concerning the vessel tank filled with helium gas of hundreds atmospheric pressure. In this paper, authors evaluates risk associated with accidental rupture of the test system. Two possible scenarios are considered: 1) the 310-bar helium tank ruptures at the center of the acoustic chamber, and 2) the 116-bar reduced-pressure helium tank ruptures in the test room shielded by bullet-proof glasses. Using the theory of blast wave propagation and computational simulation, the dynamics of wave reflected in a confined space is investigated for highly complex unsteady flow physics.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.11
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• pp.1104-1111
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• 2009

In the low altitude, mission of the aircraft is restricted by a variety of threats such as anti-air missiles and terrain obstacles. Especially, aircraft have always a risk of ground collision near terrain. In this study, to effectively solve this problem, we developed the flight path generation algorithm that is considered the terrain avoidance. In this flight path generation algorithm, waypoints that should be passed by the UAV are selected first. The waypoints are located in the middle of the terrain obstacles. Then, physically meaningful waypoints sets are classified by Dijkstra algorithm. The optimal waypoint guidance law based on the optimal control theory is applied to produce trajectory candidates. And finally the minimum control energy trajectory is determined.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.7
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• pp.91-97
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• 2004

The first Korean liquid propellant rocket KSR-III successfully finished its flight test on Nov. 28, 2002. Herein, we summarize the results of range safety system operation which is employed for the first time in flight tests of rockets developed by Korea Aerospace Research Institute(KARI). During the flight, safety-critical flight data including instantaneous impact points are monitored in realtime by range safety officers utilizing Range Safety Display Systems. The recorded screen of the display system is presented for the explanation of safety operation. In addition, comparisons are made between onboard navigation system based and radar based results in calculating instantaneous impact points, and also errors from the finally recorded impact point are described.