• Weed & Turfgrass Science
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• v.4 no.3
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• pp.256-261
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• 2015

Trampling stress in turfgrass fields caused by traffics often occurs in zoysiagrass (Zoysia japonica) fields including golf course. In order to know the influences of trampling stress on the growth and development of turfgrass, leaf and root growth, chlorophyll fluorescence, chlorophyll content and 2-DE protein analysis were conducted in the turfgrass plants subjected to various levels of trampling stress from 0 to $9,420J\;day^{-1}$ day. Shoot growth was more highly inhibited by trampling stress than root growth. Although root growth was affected by trampling with weak intensity, the highest root length was observed in the turfgrass treated with weak trampling ($1,570J\;day^{-1}$). Chlorophyll fluorescence (Fv $Fm^{-1}$) was drastically lowered by trampling stress with moderate intensity. Leaf number showed similar tendency with leaf greenness. The number was decreased as the trampling intensity was increased. Shoot dry weight was decreased showing a similar tendency with the result of shoot length. The specific protein expressions under weak trampling were related to the functions of stress amelioration. Heat shock 70 kDa protein 10 and oxygen-evolving enhancer protein 1 were the proteins increased positively under trampling stress.

• Journal of Advanced Navigation Technology
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• v.15 no.6
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• pp.1025-1033
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• 2011

This paper presents a realization of a peer-to-peer communication system for a UAV navigational monitoring using a commercial HSDPA(High Speed Download Packet Access) mobile communication device. The realized system consists of a communication server, an air data terminal and multiple ground monitoring devices, where the server transfers navigational data from a UAV to multiple monitoring devices in real-time with commercial HSDPA modem. Through ground and flight tests, data were obtained to observe the realized system. Test results show that, depending on communicational environment, about 300msec delay, congestion and packet-loss between air data terminal and ground monitoring devices. Nevertheless, through high-speed long range test on a ground vehicle and altitude test with a UAV flight, the feasibility of a UAV navigational monitoring system was observed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.67-72
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• 2010

In this paper, we verify the driverless operation possibility of MBS, which could overcome the defects of conventional track-circuit-based FBS, such as additional needs of maintenance and others problems according to short-circuit sensibility and, and which could allow the minimal interval between trains. With MBS, we can expect the reduction of headway, then the increase of transportation demand, and the protection of unnecessary speed variation because it allows the real time detection of train position from central office, and direct transmission of data between preceding trains and the following ones. In addition, it is possible to reduce the number of wayside-equipment substantially, to improve the passenger service, and to the achieve the positive economic effects by comfortable ride.

• Korean Journal of Computational Design and Engineering
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• v.20 no.3
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• pp.221-229
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• 2015

M&S (Modeling & Simulation) based design is widely accepted for the development of the future weapon system with better performance in a cheaper and faster way. Integrated simulation environment (ISE) is needed for the M&S based design. On the ISE, system engineers can not only verify design options but also validate system requirements. In this paper, we propose architectural models of the integrated simulation environment (ISE) which incorporates mission effectiveness M&S (Modeling & Simulation), system performance M&S, the optimization model of integrated performances, digital mockup and virtual prototype. The ISE architectural models may be used to implement the ISE for the development of the future unmanned ground combat vehicle.

• Journal of the Korean Society of Systems Engineering
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• v.13 no.2
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• pp.18-25
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• 2017

The use of unmanned combat systems is of interest for future battlefield. Advanced techniques are being actively studied to build fully autonomous unmanned systems. However, there are technical, ethical and legal limitations for the fully autonomous unmanned combat systems. In addition, a remote controlled system is necessary so far in order to prepare for situations where fully autonomous unmanned systems fail to function properly. Thus, a procedure of developing operational requirements in system level is proposed and interface requirements of unmanned combat vehicles for remote control are described in this study.

• Proceedings of the KIEE Conference
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• 2007.04c
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• pp.240-243
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• 2007

무선통신을 적용하여 최첨단 무인자동운전을 구현하기 위하여 기존 고정폐색의 신호시스템과 달리 무선에 의한 양방향 통신을 기본으로 하는 이동폐색시스템인 CBTC(Communication Based Train Control) System을 적용하고 있다. 이를 구현하기 위하여 열차의 위치를 검지하는 기법으로 TOA(Time of Arrival)을 적용하였으며 이를 토대로 시험선의 선로변에 설치한 무선기(Wayside Radio Set : WRS)와 차량에 설치된 차상 무선기(Vehicle Radio Set : VRS)가 무선통신을 수행하고 지상에서 측정거리 결과로부터 열차의 위치를 계산되는 것으로 WRS와 VRS간의 거리에 따라 비례하여 증가하는 것을 확인하였고 아울러 측정거리지점에서의 품질이 우수함을 확인하였다.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.1
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• pp.9-15
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• 2012

This paper shows an effective scanning trajectory for a mine detection device that is one of the mission equipments of unmanned ground vehicle. The mine detection device is composed of a mine-detection sensor, and a 4 DOF manipulator enabling sensor position control. There are three modes that manage the mine detection device: passive, semi-automatic, and automatic. The automatic mode is used the most. This paper suggests a scanning method that makes shape of 8. This method prevents missing target area and enhances scanning speed when the mine detection device scans the ground surface in automatic mode. The suggested method is verified by simulations and experiments.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.75-75
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• 2000

Recently, number of navigation system using GPS and other complementary sensors has been developed to offer high-position accuracy. In this paper, an integration of GPS and Dead-Reckoning, which consists of a fiber optical gyroscope and two high-precision wheel-motor encoders for a unmanned navigation system, is presented. The main objective of this integrated GPS/DR unmanned navigation system is to provide accurate position and heading navigation data continuously for autonomous mobile robot. We propose a method for increasing the accuracy of the estimated position of the mobile robot by its DR sensors, high-precision wheel-motor encoders and a fiber optical gyroscope. We used Kalman filter theory to combine GPS and DR measurements. The performance of GPS/DR navigation system is evaluated.

• Journal of the Korea Institute of Military Science and Technology
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• v.8 no.2 s.21
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• pp.5-13
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• 2005

The use of robot is no longer limited in the industrial scene, and becoming expanded toward many aspects of human life. Especially, military robot closely concerned with our lives seems to advance more and more in the future. As a need analysis for developing military robot, this project conducted a poll about Unmanned Reconnaissance Robot, and on the basis of the result, I suggested 3 directions of developing UGV(Unmanned Ground Vehicle) suitable to strategic environment of Korea.

• Proceedings of the KIEE Conference
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• summer
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• pp.1429-1431
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• 2004

경량전철의 무인운전을 위한 무선제어 신호 시스템 중에서 열차 제어정보 처리를 위한 무선데이터 전송시스템을 개발하였다. 개발된 시스템은 각각 중앙운용시스템, 지상무선중계시스템 및 개별차량운용시스템으로 구성된다. 무선데이터 네트웍은 2.4GHz 대역의 확산스펙트럼 방식의 주파수 호핑 라디오 모뎀을 사용하여 전용망을 구성하였으며 1초 이내에 무선망 내에 위치하는 모든 무선데이터 전송시스템과 정보를 교환하도록 설계되었다. 현재 실험실 테스트를 완료하고 새로이 건설된 전용 시험선에서 그 유효성을 테스트 중에 있다.