• 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.

• Journal of Space Technology and Applications
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• v.3 no.3
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• pp.280-300
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• 2023

This paper includes the development and operational status of the space object collision risk management system operated by the Korea Aerospace Research Institute. Currently, it monitors 6 low-orbit satellites and 3 geostationary satellites for collision risks 24 hours, enabling prompt collision avoidance maneuvers to ensure safe and stable operations. Since Chinese anti-satellite test (ASAT) in 2007, the monitoring of collision risks between space objects and operational satellites has been taken seriously, leading to the development of various collision risk management systems to respond quickly and efficiently to such situations. This paper provides an introduction to the space object collision risk management system developed from 2007 to the present, the current status of artificial space objects around Earth, and the system currently in operation. Additionally, it outlines future prospects and plans for the system.

• Journal of Space Technology and Applications
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• v.2 no.1
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• pp.13-29
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• 2022

Recently, the number of space objects around the Earth has increased rapidly, necessitating systematic space risk management. This paper proposes a dual-mode framework for assessing the risk of collision between space objects. The proposed framework consists of microscopic and macroscopic modes. The former focuses on one-to-one collision events, and the latter assesses the overall collision risk inside a cell located in space. Two risk assessment case studies using the proposed two modes demonstrate the effectiveness of the proposed framework.

• Journal of the Korean earth science society
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• v.43 no.1
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• pp.224-235
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• 2022

This study aimed to confirm the status of media reports on space hazards using topic modeling analysis of media articles that are related to space hazards for the past 12 years. Therefore, Latent Dirichlet Allocation (LDA) analysis was performed by collecting over 1200 space hazards articles between 2010 and 2021 on solar storm, artificial space objects, and natural space objects from BIGKins news platform. The articles related to solar storm focused on three topics: the effect of solar explosion on satellites; effect of solar explosion on radio communication in Korea, centered on the Korean Space Weather Center; and relationship between aircrew and space radiation. The articles related to artificial space objects focused on three topics: the threat of space garbage to satellite and space stations and the transition of useful objects into space junk; the relationship between space garbage and humanity as shown in movies; and the effort of developed countries for tracking, monitoring, and disposing of space garbage. The articles related to natural space objects focused on two topics: International Space Agency's tracking and monitoring of near-Earth asteroids and the countermeasures of collisions, and the evolution and extinction of dinosaurs and mammals, with a focus on the collisions of asteroids or comets. Therefore, this study confirmed that domestic media play a role in conveying dangers of space hazards and arousing the attention of public using a total of eight themes in various fields such as society and culture, and derived education method and policy on space hazards.

• Aerospace Engineering and Technology
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• v.12 no.2
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• pp.123-130
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• 2013

Many countries tried to design the collision risk management system to protect their own satellites from collision probability due to the space debris. In this situation, KARI(Korea Aerospace Research Institute) is developing the KARISMA(KARI Conjunction Risk Management System) to protect our operating satellites from these space debris. The quality of this system is depending on the accuracy of orbit determination for the space debris which has collision risk. Therefore, this system must treat many kinds of measurement data types to estimate the orbit of space debris. In this paper, to handle the radar observation data widely used for these space debris, the orbit determination system was applied with simulated radar tracking data for the KOMSAT-2 which has precise orbit determination data.

• 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.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.11a
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• pp.71-74
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• 2006

This study shows the historical background, and work flow of PRA (Probabilistic Risk Assessment) method which devised by NASA during the space development. It also illustrates the possibility of adoption of the method to evaluation of reliability KSLV project.

• The Monthly Technology and Standards
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• s.117
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• pp.12-13
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• 2011

우주사업은 그동안 강대국 정부의 후원금으로 진행이 되었지만 점차 비즈니스 수단으로 변하고 있다. 국제 우주정거장과 같은 대규모 우주사업의 비용과 복잡성 때문에 전 세계적으로 긴밀한 협력이 더욱 필요한 실정이다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.3
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• pp.214-224
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• 2018

Continuous space development increases the occurrence probability of space hazards such as collapse of a satellite and collision between a satellite and space debris. In Korea, a space surveillance network with optical system has been developed; however, the radar technology for an independent space surveillance needs to be secured. Herein, an L-band phased array radar system for the detection and tracking of space objects is proposed to provide a number of services including collision avoidance and the prediction of re-entry events. With the mission analysis of space surveillance and the case analysis of foreign advanced radar systems, the radar parameters are defined and designed. The proposed radar system is able to detect a debris having a diameter of 10 cm at a maximum distance of 1,576 km. In addition, we confirmed the possibility of using the space surveillance mission for domestic satellites through the analysis of the detection area.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.8
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• pp.661-673
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• 2014

In this paper, a precise orbit determination process was carried out based on KARISMA(KARI Collision Risk Management System) developed by KARI(Korea Aerospace Research Institute), in which optical tracking data of a geostationary satellite was used. The real optical tracking data provided by ESA(European Space Agency) for the ARTEMIS geostationary satellite was used. And orbit determination error was approximately 420 m compared to that of the ESA's orbit determination result from the same optical tracking data. In addition, orbit prediction was conducted based on the orbit determination result with optical tracking data for 4 days, and the position error for the orbit prediction during 3 days was approximately 500~600 m compared to that of ESA's result. These results imply that the performance of the KARISMA's orbit determination function is suitable to apply to the collision risk assessment for the space debris.