• Bulletin of the Korean Space Science Society
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• 2010.04a
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• pp.29.2-29.2
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• 2010

항법분야에 있어서 위성항법시스템의 다양한 오차를 제거한 정밀한 위치 정보를 이용하여 이동체에 활용하는 연구가 진행되고 있다. 실제 환경에서 이동체를 이용한 항법실험을 수행하기 전 실제 환경과 유사한 가상의 실시간 테스트베드를 구축하여 알고리즘 테스트 및 검증 실험을 수행하려 한다. 이를 위해 이동체의 운동을 시뮬레이션하는 운동궤적제어시스템과 실제의 항법신호를 시뮬레이션하는 GNSS 시뮬레이터 사이의 시각동기화는 실시간 시뮬레이션을 구현하기 위해 필수적으로 요구된다. 동기화 되지 않은 시각정보는 이동체 운동궤적제어시스템에 의해 생성된 실제의 궤적과 GNSS 시물레이터로부터 생성된 궤적사이의 오차를 유발하여 항법수신기의 부정확한 항법신호를 유발한다. 이 연구는 GNSS 시뮬레이터를 이용한 실시간 테스트베드의 구축에 있어 필요한 이동체 운동궤적의 시각동기화 기술 개발을 목표로 한다. GNSS 시뮬레이터는 Spirent 사의 GPS 시뮬레이터가 사용되었다. 이동체의 위치, 속도, 가속도와 같은 움직임을 나타내는 운동에 관한 명령은 적용되어야 하는 정확한 시각이 함께 전송되므로, 이는 그 시각 이전에 GPS 시뮬레이터에 도달해야 한다. 따라서 1초(1 Hz) 또는 0.1초(10 Hz) 사이에 원격제어시스템과 GPS 시뮬레이터사이의 시각 동기화를 구현하였다. 시뮬레이터와의 시각정보 동기화를 위해 Amplicon사의 PCI-215 타이머카드를 이용하였고, 그 결과, 이동체 운동궤적제어시스템과 시뮬레이터의 시각정보를 $10^{-3}$ 내의 위치오차를 가지는 정밀도로 동기화됨을 확인할 수 있었다.

• Journal of the Korean Society of Safety
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• v.18 no.3
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• pp.154-160
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• 2003

Uncertain time delay happens when the process reads the sensor data and sends the control input to the plant located at a remote site in distributed control system. As in the case of data network using TCP/IP, VDN that integrates both device network and data network has uncertain time delay. Uncertain time delay can cause degradation in performance and stability of distributed control system based on VDN. This paper first investigates the transmission characteristic of VDN and suggests a control scheme based on the Smith's predictor to minimize the effect of uncertain varying time delay. The validity of the proposed control scheme is demonstrated with real-time velocity control of DC servo motor located in remote site.

• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.299-304
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• 2006

This paper is for the on-line monitoring and controlling system in which remote central processor execute commands based on data transmitted via radio or cable captured from the industrial or marine environments. By executing the appropriate system commands, many mechanical parts in industrial environments and natural factors such as temperature and humidity are to be under control in the way of normal system condition. In this research, we control the temperature of a hydrochloric acid tank to be within the predetermined range by executing temperature controlling commands issued by remote central computer which decides the appropriate action for the total system based on the received sensor data transmitted via radio and cable media. This type of monitoring and controlling system has the various applications such as the disaster prevention system, ubiquitous embedded system, alarm system, and the USN systems.

• Journal of Industrial Convergence
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• v.16 no.4
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• pp.47-52
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• 2018

WebShell is a web script file created by a hacker to remotely commands to a web server. The hacker can bypass the security system using the web shell, access the system, control the system such as file modification, copying and deletion, install malicious code in the web source code, attack the user's PC, And so on. There are many types of WebShell attack, but we study about attacks on PHP and JSP based web server which are used as representative ones. And we propose the method of web page management, method of development, and several other methods. By using these countermeasures, it is possible to effectively prevent damage caused by WebShell attacks.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.246-249
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• 2009

인간 생활의 편의를 위해 지능형 서비스 로봇에 대한 필요성이 증가하고 있지만, 인간과 로봇이 상호간에 소통할 수 있는 인터페이스나 애플리케이션 등의 개발은 미흡한 상태이다. 이러한 문제점을 극복하고 지능형 서비스 로봇의 대중화를 위하여 사용자 중심의 애플리케이션을 제안한다. 사용자 애플리케이션은 각 시스템들의 정보를 분석하여 제어하는 부분을 담당하고, 사용자의 명령을 블루투스 통신을 통해 로봇에게 전달하며, 로봇의 위치데이터 및 영상정보를 사용자에게 보여준다. 제안 시스템을 통해 로봇에 대한 전문지식이 없는 사용자도 로봇을 쉽게 제어할 수 있으며, 관리자는 원격지에서도 제어 및 모니터링이 가능하여 시스템 관리의 편의성을 제공한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.12 no.6
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• pp.517-523
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• 2002

In this paper, we propose system that apply VIBL method to add speech recognition to LIBL method based on human s studying method to use natural language to steering system of ship, MERCS and winch appliances and use VIBL method to alternate process that linguistic instruction such as officer s steering instruction is achieved via ableman and control steering gear, MERCS and winch appliances. By specific method of study, ableman s suitable steering manufacturing model embodies intelligent steering gear controlling system that embody and language direction base studying method to present proper meaning element and evaluation rule to steering system of ship apply and respond more efficiently on voice instruction of commander using fuzzy inference rule. Also we embody system that recognize voice direction of commander and control MERCS and winch appliances. We embodied steering manufacturing model based on ableman s experience and presented rudder angle for intelligent steering system, compass bearing arrival time, evaluation rule to propose meaning element of stationary state and correct steerman manufacturing model rule using technique to recognize voice instruction of commander and change to text and fuzzy inference. Also we apply VIBL method to speech recognition ship control simulator and confirmed the effectiveness.

• Journal of Satellite, Information and Communications
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• v.1 no.2
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• pp.45-50
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• 2006

A satellite and ground stations which are developed in a program are tested whether the interface between the satellite and ground is well established before satellite operations. These compatibility tests are performed when the satellite is connected with the ground stations after all satellite and ground stations requirements are verified. The content of the RF compatibility test is to check whether the interface requirements which are described on the Interface Control Document are well developed. During the early operation phase and tentative contingency operations of the satellite, KARI ground station uses other oversea ground stations which are located worldwide according to contract between the KARI and the contractor. Since oversea ground stations were not developed for the designated space program, system integrator should check whether the oversea ground stations are satisfied with interface requirements. Using the RF suitcase, RF interface and the content of RF communication can directly be verified during RF compatibility test on oversea ground station without KARI ground station's support. The RF compatibility test using RF suitcase was performed oversea ground stations as well as KARI ground station located on Korea. The content of RF compatibility test was standardized in order to be used at any oversea ground stations, especially fitted for the operations concept of launch and early operations phase. The test content would be RF characteristics, protocol, command loop test, telemetry loop test, and ground station interface test.

• KIPS Transactions on Software and Data Engineering
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• v.6 no.9
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• pp.429-436
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• 2017

Unmanned Aerial Vehicles (UAV) that are piloted without human pilots can be commanded remotely via frequencies or perform pre-inputted missions. UAVs have been mainly used for military purposes, but due to the development of ICT technology, they are now widely used in the private sector. Teal Group's 2014 World UAV Forecast predicts that the UAV market will grow by 10% annually over the next decade, reaching $ 12.5 billion by 2023. However, because UAVs are primarily remotely controlled, if a malicious user accesses a remotely controlled UAV, it could seriously infringe privacy and cause financial loss or even loss of life. To solve this problem, a secure channel must be established through mutual authentication between the UAV and the control center. However, existing security techniques require a lot of computing resources and power, and because communication distances, infrastructure, and data flow are different from UAV networks, it is unsuitable for application in UAV environments. To resolve this problem, the study presents a lightweight UAV authentication method based on Physical Unclonable Functions (PUFs) that requires less computing resources in the ground Control and Non-Payload Communication (CNPC) environment, where recently, technology standardization is actively under progress.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.3
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• pp.218-227
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• 2016

Korean government plans to launch a lunar orbiter and a lander to the Moon by 2020. Before launch these two proves, an experimental lunar orbiter will be launched by 2018 to obtain key space technologies for the lunar exploration. Several payloads equipped in experimental lunar orbiter will monitor the surface of the Moon and will gather science data. Lunar orbiter sends telemetry and receives tele-command from ground using S-band while science data is sent to ground stations using X-band when the visibility is available. Korean deep space network will be mainly used for S and X-band communication with lunar orbiter. Deep Space Network or Universal Space Network can also be used for the S-band during trans-lunar phase when korean deep space network is not available and will be used for the S-band in normal mission orbit as a backup. This paper analyzes a visibility condition based on the combination of various ground antennas and its mask angles according to mission scenario to predict the number of contacts per day and to build an operational scenario for the lunar orbiter.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.6
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• pp.77-83
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• 2020

The heat treatment facility is in a situation where the scope of application of the remote IOT system is expanding due to the harsh environment caused by high heat and long working hours among the root industries. In this heat treatment process environment, the IOT middleware is required to play a pivotal role in interpreting, managing and controlling data information of IoT devices (sensors, etc.). Until now, the system controlled by the heat treatment remotely was operated with the command of the operator's batch system without overall monitoring of the site situation. However, for the safety and precise control of the heat treatment facility, it is necessary to control various sensors and recognize the surrounding work environment. As a solution to this, the heat treatment safety support system presented in this paper proposes a support system that can detect the access of the work manpower to the heat treatment furnace through thermal image detection and operate safely when ordering work from a remote location. In addition, an OPEN CV-based deterioration analysis system using DNN deep learning network was constructed for faster and more accurate recognition than general fixed hot spot monitoring-based thermal image analysis. Through this, we would like to propose a system that can be used universally in the heat treatment environment and support the safety management specialized in the heat treatment industry.