• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.10
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• pp.127-133
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• 2004

This paper described development of the portable ground control system(PGCS) for unmanned aerial vehicle. In the design of GCS, it upload mission planning that aircraft has to perform and has to receive position, attitude, state, navigation information all about the aircraft. Aircraft states and trajectory are displayed using this system on line. The PGCS is composed of commercial notebook computer, RF modem for communication between aircraft and PGCS, input/output board, remote control receiver, switches and lamps. Performance of this system is verified by flight test of small unmanned aerial vehicle.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.5
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• pp.1319-1324
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• 1998

The phase and frequency commands of a ratating radar system that utilizes frequency scanning to steer the beam in the azimuth direction and phase shifters in the elevation direction are derived in terms of the angles of the groung based coordinate system. The antenna type considered is slotted arrays that are easy to construct at such high microwave frequency as the X band. The frequency that has non-linear characteristics as a functio ofthe elevation angle is plotted and the derived frequency equation is aproximated to be a simple form to reduce the calculation time for real time multi-function radar systems. It is shown that the approximated frequency command is in good agreement with the exact one if the range of azimuth scanning is limited by ${\pm}10^{\circ}$.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.6
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• pp.548-554
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• 2012

Verification and validation of operational software of the flight control computer, which is flight safety critical, is very important to prove correctness and faultness of the software. To verify the real-time softare requirement on operational software of flight control computer, real-time software internal parameter and variable monitoring technics on hardware-in-the-loop environment, similar to on-flight environment, is required. This paper describes flight safety critical software validation and verificiation environment using standard debugging interface, NEXUS 5001.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.7
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• pp.610-617
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• 2017

In the recent weapon system trend, it is required to develop small and low cost guidance missile to track and strike the enemy target effectively. Controling the such small drone typed weapon demands a integrated electronic device that equipped with not only a wireless network interface, a high resolution camera, various sensors for target tracking, and position and attitude control but also a high performance processor that integrates and processes those sensor outputs in real-time. In this paper, we propose the android smartphone as a solution for that and implement the guidance and control application of the missile. Furthermore, the performance of the implemented guidance and control application is analyzed through the simulation.

• Journal of Practical Engineering Education
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• v.9 no.1
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• pp.15-21
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• 2017

In order to satisfy the graduation requirements, the graduation work should be presented as an engineering dissertation system of the produced work and an outline of the procedure made by the major unit in accordance with the graduation thesis submission rules, and suggests necessary matters for improvement. The design content relates to a small unmanned aerial vehicle configuration for detecting personnel or objects in a disaster area. It is equipped with an infrared sensor and a GPS in the drone, the drone is control by using Blutooth communications. The drones detect the target and use the GPS to determine the location. As a result of the experiment, it was possible to detect the structure object within the range of 3~4 m, confirm the transmission of the position value in real time, and increase the communication distance by using RF communication.

• Analyses & Alternatives
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• v.7 no.1
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• pp.83-114
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• 2023

Previous studies on international politics dealing with World War I mainly pointed to the balance of power and alliance issues as the causes of war. This view saw the assassination of Sarajevo, the direct cause of the war, as a simple opportunity. As a result, these studies can explain 'what made war inevitable' but still need to fully explain 'why the war started in the Balkans and how it spread throughout Europe.' To compensate for the limitations of these preceding studies, this study aim to find the origin of World War 1 in the context of the Balkan, which began with the conflict between Germany-Austria and Russia-Serbia. To this end, this study analyzed the historical background of the Balkan crisis and the development of the crisis through the concept of Shoemaker and Spanier's patron-client relationship between states and crisis manipulation. As a result, it confirmed that competition between Russia and Germany and crisis manipulation attempts by their client states did not necessarily lead to war. But crisis manipulation has instilled a competitive mindset in patron states that will potentially and cumulatively work. Since then, unexpected crises have occurred, and rival patrons have suspected that their opponents are planning grand strategic conspiracies and challenges. As a result, they have become vulnerable to crisis manipulation by the clients. This situation was the cause of the outbreak of World War I in the context of the Balkans' patron-client relationship.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2603-2605
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• 2004

적외선 영상 시뮬레이션 시스템(IIRSS : Imaging Infrared Simulation System)은 적외선 영상 센서를 탑재한 유도무기체계의 종말 호밍 단계에서의 체계 유도조종 성능 및 기능을 시험평가하기 위한 목적으로 연구 개발되었다. 적외선 영상 시뮬레이션 시스템은 체계성능을 단계적이고 종합적인 시험평가를 위하여 표적 주위 환경에 대하여 사실적이고, 동적인 실시간 시뮬레이션 환경이 제공되어야한다. 시뮬레이터 개발에 있어서 주요 관련 기술은 지형, 지물에 대한 3차원 모델링, 대기투과효과 모델링 및 합성된 적외선 영상의 실시간 렌더링 기술 등이다. 본 논문에서는 적외선 센서 시뮬레이션의 방법으로써 HILS(Hardware-in-The-Loop Simulation)를 위한 시뮬레이터 구성, 적외선 영상 생성을 위한 도구와 절차 및 시뮬레이션 방안에 대하여 기술한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.451-454
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• 2006

본 논문에서는 헬기의 인공 시계 시스템용 DGPS/INS 통합 항법 플랫폼을 설계하였다. DGPS/INS 통합 항법 플랫폼 하드웨어는 PowerPC CPU와 Flash ROM과 DDR SDRAM를 이용하여 설계하였다. DGPS 수신기와 IMU와의 연결을 위한 외부 인터페이스부는 직렬 통신을 사용하는 DGPS수신기와 IMU는 모두 사용할 수 있도록 하기 위하여 직렬 통신 방식인 UART 컨트롤러와 SDLC 컨트롤러를 사용하여 설계하였다. 실시간 운영체제를 기반으로 하는 플랫폼의 소프트웨어는 초기 정렬, 자세 계산, 속도 계산, 위치 계산, 통합 필터, 명령 처리 각각에 대하여 태스크로 구성하고 세마포어를 이용하여 태스크간의 동기가 이루어지도록 설계하였다. 통합 항법 플랫폼의 성능 평가를 위하여 차량 실험을 수행하였으며 상용 항법 시스템의 결과와 비교를 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.25-26
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• 2013

제한수역에서 측벽부근을 대형선박이 항행할 경우, 측벽으로 인하여 발생하는 유체력이 대형선박의 조종운동에 상당히 크게 영향을 미친다는 것은 잘 알려져 있다. 이 논문에서는 방파제형상을 하고 있는 측벽 부근을 대형선박이 항행하는 경우, 선박과 방파제 형상간의 간섭력 추정을 위해 세장체 이론을 토대로 한 계산 방법을 적용하였으며, 선박에 미치는 측벽의 영향을 파악하기 위하여 방파제길이, 방파제와 선박간의 거리 및 수심을 변수로 하여 선박과 측벽과의 간섭력을 수치 계산하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.509-511
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• 2018

셀프 카메라로 배경과 함꼐 사용자 자기 자신의 전신 샷을 찍을 수 있도록 도와주는 '셀카봉'이 등장하였지만 아직도 사용자부터 카메라까지 거리의 한계가 존재하기 때문에 셀프 카메라를 찍는 것에 불편함이 있다. 이러한 문제점을 해결하기 위해 드론을 이용하여 셀프 카메라를 찍을 수 있도록 하는 기술을 제안한다. Real-Time 영상처리를 이용해 웹과 드론이 서로 통신을 하여 Haar Cascade 알고리즘을 기반으로 사용자의 얼굴을 실시간으로 인식하고 PID 제어를 통해 드론을 자동으로 조종한다면 사용자의 제스쳐에 인식해 드론의 촬영 기능을 컨트롤 할 수 있도록 한다.