• Electronics and Telecommunications Trends
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• v.32 no.1
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• pp.82-92
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• 2017

최근 들어 무인기와 무선통신기술의 비약적인 발전은 무인기들을 국가 공역에 진입시켜 운행할 필요성과 택배, 긴급 통신영역 확장, 재해 감시 및 대처, 위험지역 정찰, 항공촬영과 같은 다양한 분야로의 활용에 대한 요구를 크게 증가시켰다. 다수의 무인기를 안전하게 운행 및 조종하기 위해서는 고신뢰성 및 고보안성을 제공하는 무인기 제어 전용 네트워크가 요구되며, 이러한 네트워크를 무인기 제어용 통합 네트워크라고 한다. 본고는 무인기 제어용 통합 네트워크의 보안 적용 구간을 분류하고, 구간별로 보안 요구사항과 요구사항을 달성할 수 있는 보안기술들을 차례로 제시한다. 또한, 향후에 무인기 제어용 통합 네트워크의 보안성을 강화하기 위해 개선되어야 하는 부분들을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.507-509
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• 2015

본 논문에서는 다수의 공중무인기로 구성된 이동센서네트워크를 이용하여 유해 지역 또는 인력 접근이 제한된 지역 감시를 고려한다. 공중무인기는 기존 무인기와 달리 이동 제약이 적으며 기동성이 뛰어나 다양한 분야에서 활용이 가능하다. 그러나 다수의 공중무인기를 이용하여 센서네트워크 구축할 경우 지상 관제센터의 한정된 자원으로 인해 개별 공중무인기 제어에 한계가 있다. 따라서 최소한의 중앙 제어를 통한 신속한 네트워크 구축, 관심 지역으로 위치 이동 그리고 자율적 협업을 통한 센싱커버리지 최대화를 위한 알고리즘이 요구된다. 본 논문에서는 공중무인기의 제한된 센싱 거리와 통신 거리를 바탕으로 다수의 공중무인기를 이용한 가상력 기반 협력 감시 네트워크 구성을 고려한다. 또한 시뮬레이션을 통해 관리자의 별도의 제어 없이 다수 공중무인기의 자율 감시 네트워크를 구축과 지역 감시가 가능함을 보인다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.7
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• pp.3-11
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• 2017

UAV system has the limitation to allocate enough spectrum bandwidth for the operation of multiple UAVs due to the market expansion. In addition, the communication environment of UAV network varies dynamically due to the UAV's mobility. Thus, to operate the stable UAV system and maximize the transmission data rate, it needs to allocate the resource effectively in the limited bandwidth considering the given network environment. In this paper, we propose the resource allocation algorithm which can maximize the network throughput as well as satisfy the minimum data requirement for the UAV system operation in the given network environment based on TDMA(Time Division Multiple Access). By performance analysis, we show that the proposed algorithm can allocate the resource to satisfy the high network throughput as well as the minimum data requirement in the given network environment.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.4
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• pp.97-108
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• 2016

In this paper, we consider a cooperative monitoring network, which consists of a large number of UAVs, in order to promptly detect event in a disaster area. A command center may not be able to control each UAV individually due to resource constraints. Therefore, UAVs need to autonomously construct a mobile monitoring network in order to maximize monitoring coverage and to adapt the network formation according to environment changes in the disaster area. To that end, we propose multiple UAVs-based cooperative monitoring schemes that uses virtual forces. In this monitoring scheme, an effective monitoring is enabled by extending monitoring coverage using each UAV's circle movements. The UAVs-based monitoring network can also be splitted or merged in order to increase the monitoring effectiveness. Through simulations, we show that the proposed scheme can effectively monitor a large area and achieve a high event detection ratio.

• Electronics and Telecommunications Trends
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• v.32 no.4
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• pp.78-88
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• 2017

무인기의 기술 발전에 따른 운송, 통신중계, 교통감시, 산불감시 진화, 재해 재난대처 등 무인기의 민간 및 공공 수요가 확대되고 있다. 무인기는 국가 공역으로의 운항이 요구되는데, 국가 공역으로의 안전한 진입을 위해서는 유인항공기 조종사에 의한 시각 감지 및 회피와 동일할 수준의 안전성을 제공하는 탐지 회피 능력과 함께 신뢰성 높은 무인기 제어용 통신링크 확보가 필수적으로 요구되고 있다. 따라서, 본고에서는 국외 기술 개발 및 표준화 동향을 바탕으로 국가 공역에서의 무인기의 안정적 진입을 위해 필요한 무인기 지상 제어용 통신 및 네트워크 기술에 대해 살펴보고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.1
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• pp.147-155
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• 2015

In this paper, we consider a mobile sensor network for monitoring a polluted area where human beings cannot access. Due to the limited sensing range of individual unmanned vehicles, they need to cooperate to achieve an effective sensing coverage and move to a more polluted region. In order to address the limitations of sensing and communication ranges, we propose a hazardous substance monitoring network based on virtual force algorithms, and develop a testbed. In the considered monitoring network, each unmanned vehicle achieves an optimal coverage and move to the highest interest area based on neighboring nodes sensing values and locations. By using experiments based on the developed testbed, we show that the proposed monitoring network can autonomously move toward a more polluted area and obtain a high weighted coverage.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.11
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• pp.1042-1051
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• 2011

In this paper, a total operating environment equipped with onboard wireless communication systems and ground-based mission control systems is proposed for simultaneous operation of multiple UAVs. A variety of operating structures are studied and classified systematically based on types and usages of the components. For each operating system, the strength, weakness and reliability aspects are investigated. Based on these results, a proper operating system configuration is determined and components are developed for mission formation flight. Proposed system can make a formation flight of various UAVs, execute complex missions decentralizing mission to several UAVs and cooperate several missions.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1035-1036
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• 2017

재난관리 및 대응 분야에서는 무인기의 낮은 운영비용과 자유로운 이동능력의 장점을 토대로, 무인기를 활용한 다양한 재난대응 방안이 연구되고 있다. 본 논문은 무인기를 통해 획득한 항공영상에 대하여, 기계학습 기반의 영상분석을 통한 사람 검출 및 사람 위험 감지 기술을 제안한다. 제안하는 기법은 사람 검출을 위한 딥러닝 네트워크와 범람지역 검출을 위한 딥러닝 네트워크로 구성된다. 제안하는 기법에서 사용하는 두 개의 딥러닝 네트워크를 통해, 사람의 단순 검출뿐만 아니라, 범람지역과 같은 위험지역 검출을 통해, 사람의 위험도를 판단할 수 있다.

• Korean Security Journal
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• no.46
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• pp.189-216
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• 2016

In March 2015, the North Korean UAVs (Unmanned Aerial Vehicles) were found and countries around the world have actively developed UAVs. UAVs or Drone have become commercialized and more civilians use UAVs for leisure. The positive possibilities of UAV use expand. However, there could be the negative sides of UAV use. The UAVs could be used for the purpose of various crime, cybercrime, and terrorism. For instance, hacking devices attached drone could be infiltrated into the sensitive networks to steal personal informations and public data. This could be a new dimension of cybercrime. As the number of internet users and cyberspace rapidly expands, problems of crimes could be worsened both quantitatively and qualitatively. By contrast, defensive measures against such threats are limited. Especially, the Korean society is vulnerable despite its well-advanced internet and computer network technology. This article investigates the current UAV types and its developments, discusses various possibilites of UAV-related crime, cybercrime, and terrorism, and proposes responses.

• Smart Media Journal
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• v.6 no.4
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• pp.65-71
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• 2017

In this paper, we propose a design method for the construction of LTE-based small unmanned aerial vehicle control system to quickly and reliably collect multiple small unmanned aerial vehicle position information simultaneously flying all over the country. In particular, the main requirements are the network (N/W), hardware (H/ W), software(SW), Database(DB), development architecture, and business needs. To satisfy these requirements, N/W, H/W, SW, DB design, and architectural design plan were suggested regarding the design requirements of a small UAV system. To effectively control the small unmanned multi-party system in the system design, the architecture is divided into the front-end service area and the back-end service area according to the function and role of the unit system. In the front-end service area that grasps and controls the position and state of small unmanned aerial vehicles (UAVs), we have studied the design part that can be expanded to N through TCP/IP network by applying Client PC method.