• Journal of the Korea Convergence Society
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• v.12 no.7
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• pp.1-6
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• 2021

Currently, virus infection such as Corona 19 has become commonplace, and interest in unmanned systems is increasing in the field for non-face-to-face ICT services. In this paper, the function and performance of remotely successfully controlling a store through video and audio using an IP PBX with a broadcasting function was verified through a test. And the fully unmanned system is not gaining credibility due to various technical problems, however the central control system is a very efficient and reliable system because the controller can directly control the customer while monitoring the access and the inside of the store through the video and audio. In the future, we plan to study a completely unmanned remote control system using A.I technology.

• Journal of the Korea Institute of Military Science and Technology
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• v.11 no.4
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• pp.59-67
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• 2008

In the next near future, the human would like to use the small unmanned ground vehicle(SUGV) on the diverse fields. Specially the world of today is tried to apply with operating the task on very difficult working environments such as some dangerous or unreachable area. To work this task, this vehicle should be guaranteed with the high level of reliability, safety, and performance. In this paper, we propose to focus on not only the functional requirements, but also the non-functional requirements based on software architecture at the design stage for developing the embedded system. Through focusing on the non-functional requirements on this software architecture, we can obtain the design goal of the target system and also show the enhancement of reliability, safety and performance with 'Vtune' performance analysis tool.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.101-104
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• 2010

Recently, needs for UAVs and small aircraft and small turbo jet or turbo fan engines for these air-crafts are increasing. Size and weight are the two main restrictions in small air-crafts such as UAV or VLJ propulsion system applications. Therefore, high power density is required in small size and designers come up with unconventional solutions in the design of small aero gas turbine engines. One of the solutions is the usage of highly loaded axial compressors. This paper introduces an aerodynamic design method of a highly loaded axial compressor and its review process. Numerical simulation has been carried out to assess the aerodynamic performance of the compressor.

• Journal of Aerospace System Engineering
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• v.16 no.6
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• pp.114-122
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• 2022

This paper explores three-dimensional unsteady computational fluid dynamic (CFD) analyses with an overset grid technique to analyse the wake effect created by a rotating propeller on a hand-launched unmanned aerial vehicle (UAV). Additionally, the influence of actual aileron deflection on the equilibrium condition of the rolling moment is examined in various hand-launched take-off conditions. The results of this study demonstrate the importance of initial aileron deflection in increasing the initial rolling stability during the hand-launched take-off process. Furthermore, an aerodynamic database is constructed to rapidly predict the aileron set values required for different take-off speeds and angle-of-attacks.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.4
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• pp.447-456
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• 2010

The application of a reliable motion simulator can contribute effectively in the evaluation of the performance of a vehicle platform in the development stage of a small unmanned aerial vehicle (UAV). Therefore, the research on a reliable motion simulator can accelerate the development of UAV and decrease the relevant cost. In this paper, the design factors considered in the preliminary design stage of a 6 degree-of freedom motion simulator are defined and the motion range of the simulator is described on the basis of these design factors. The length, acceleration, and the required thrust of actuators with respect to the motion simulator under development are also predicted. The motion range can be increased and a suitable actuator can be selected and produced by applying these results in the manufacturing process of the motion simulator. Thus, the reliability of the motion simulators can be achieved during the actual design operation of the UAV.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.548-551
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• 2010

A 150 lbf-thrust class micro turbojet engine has been developed. The engine could be applied to power plant for small aviation vehicle such as UAV, decoy and anti-radar missile and was designed with concepts that has small size, low-cost and high performance. A prototype was manufactured and performed the ground static test and high altitude test. This paper outlines the features and layout of 150 lbf turbojet engine and also describes the design characteristics and test results of the engine and components.

• The Science & Technology
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• v.34 no.12 s.391
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• pp.26-27
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• 2001

건국대 능동구조재료연구실은 1991년에 문을 열어 항공우주용 고성능 능동복합재료작동기 개발에 한창이다. 소형 무인항공기, 우주 구조물 및 로봇, 정비기기에 근육형 작동기 응용부품 및 서브시스템을 개발하여 적용함으로써 그 성능을 혁신적으로 향상시키는 것을 최종 목표로 하고 있다.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.152-155
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• 2009

본 논문에서는 Manta 형상 무인잠수정의 자유항주모델을 설계하였고 이를 이용하여 제어실험을 실시하였다. 제작된 MUUTV모형은 직진방향으로 1개의 추진기를 가지고 있으며, 승강타와 방향타를 이용하여 수심 및 방향 제어를 실시하게된다. MUUTV는 수심제어시 사용되는 수심을 측정하기 위한 압력센서, 방향제어를 위해 방향각 측정을 위한 마그네틱 컴파스가 설치되어있으며, 잠수정의 전체적인 운용을 위한 Windows XP기반의 소형 On-board PC104가 장착되어있다. 시뮬레이션에 사용된 6자유도 운동모델은 PMM실험과 이론적 추정을 통해 얻어진 유체동역학계수와 파라미터를 이용하여 구성된다. 잠수정의 운동성능과 제어응답을 비교하기 위해 PID, 슬라이딩모드, 퍼지, 제어기가 설계되었으며, 이를 통해 제어 성능을 비교하고자 하였다. 또한 제작된 모델을 이용하여 수심 및 방향제어 실험을 수조에서 실시하였다.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.376-378
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• 2003

본 논문에서는 2002년도에 KT에서 개발한 내경 1,000mm의 무인통신구를 건설 할 수 있는 마이크로터널링 장비에 대해 소개하고자 한다. 개발된 장비는 3D 기법을 이용한 최첨단 기법을 통하여 개발되었으며, 소형 굴진기의 취약점인 장애물 돌파능력을 보완하기 위하여 막장으로 진입이 가능한 구조로 되어있다. 따라서 굴진 중 장애물에 직면했을 경우 막장을 통하여 장애물을 효과적으로 제거할 수 있으며, 이 막장 진입통로를 이용하여 면판의 비트와 롤러커터를 교체할 수 있으므로 장거리 굴진이 가능하다. 그리고 굴진작업 시 필요한 원압잭과 후방설비인 Desander, 송 배니펌프등의 주변설비를 Operating Room에서 통합관리 할 수 있는 터널링 관리시스템을 개발하여 적용함으로써 보다. 효율적인 굴진관리를 수행할 수 있는 특징을 갖고 있다. 이렇게 개발된 장비와 시스템은 시험 시공을 통해 그 성능을 확인하였으며, 여기서 그 개발 과정 및 시험 시공 결과에 대해 기술하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.29 no.7 s.238
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• pp.820-827
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• 2005

Development of an engine with good fuel economy is very important for successful implementation of long endurance miniature UAVs (unmanned aerial vehicles). In the study, a 4-stroke glow-plug engine was modified to a gasoline-fueled spark-ignition engine. Engine tests measuring performance and friction losses were conducted to tune a simulation program for performance prediction. It has been found that excessive friction losses are caused by insufficient lubrication at high speeds. The simulation program predicts that engine power and fuel economy get worse with high altitude due to increasing portion of friction losses. The simulation results suggest quantitative guidelines for further development of a practical engine.