• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2337-2341
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• 2005

This paper presents the target detection method using Support Vector Machines(SVMs) and the navigation system using behavior-based fuzzy controller. SVM is a machine-learning method based on the principle of structural risk minimization, which performs well when applied to data outside the training set. We formulate detection of target objects as a supervised-learning problem and apply SVM to detect at each location in the image whether a target object is present or not. The behavior-based fuzzy controller is implemented as an individual priority behavior: the highest level behavior is target-seeking, the middle level behavior is obstacle-avoidance, the lowest level is an emergency behavior. We have implemented and tested the proposed method in our mobile robot "Pioneer2-AT". Comparing with a neural-network based detection method, a SVM illustrate the excellence of the proposed method.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1999년도 추계학술대회논문집
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• pp.163-175
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• 1999

As the size and complexity of network increase, Distributed Systems Management (DSM) will be significant issue within information network in order to increase the high reliability and to improve the flexibility of network management. The OSI management model has several problems. The key problems are that it does not fully address the problems of how to develop communication protocol in support of DSM, and how to classify the management connection criteria. In this paper, to solve first problem described above, this paper propose the connectionless CMIP(Common Management Information Protocol) to accomplish for effectively managing the distributed management system, and indicate its efficiency; this protocol is available to negotiate among the managing systems, handle the dynamic information. To work out second problem, we introduce the connection criteria in the hierarchy of management systems, and finally evaluate the efficiency of a suggested protocol during cooperative negotiation among the managing systems.

• 로봇학회논문지
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• 제17권2호
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• pp.118-123
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• 2022

We implemented a real-time cloud robotics application by offloading robot navigation engine over to 5G Mobile Edge Computing (MEC) sever. We also ran a fleet management system (FMS) in the server and controlled the movements of multiple robots at the same time. The mobile robots under the test were connected to the server through 5G SA network. Public 5G network, which is already commercialized, has been temporarily modified to support this validation by the network operator. Robot engines are containerized based on micro-service architecture and have been deployed using Kubernetes - a container orchestration tool. We successfully demonstrated that mobile robots are able to avoid obstacles in real-time when the engines are remotely running in 5G MEC server. Test results are compared with 5G Public Cloud and 4G (LTE) Public Cloud as well.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2022년도 추계학술대회
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• pp.383-384
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• 2022

Gas Combustion Unit (GCU) onboard liquefied natural gas carriers handles boil-off to stabilize tank pressure. There are many factors for LNG cargo operators to take into consideration to determine whether to use GCU or not. Gas consumption of main engine and re-liquefied gas through the Partial Re-Liquefaction System (PRS) are good examples of these factors. Human gas operators have decided the operation so far. In this paper, some deep learning neural network models were developed to provide human gas operators with a decision support system. The models consider various factors specially into GCU operation. A deep learning model with Sigmoid activation functions in input layer and hidden layers made the best performance among eight different deep learning models.

• Journal of Positioning, Navigation, and Timing
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• 제12권4호
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• pp.431-436
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• 2023

In order to provide continuous Korea Augmentation Satellite System (KASS) services, the operation organization should continuously and systematically perform operations, maintenance, and technical activities. All subsystems of KASS, all Line Replacement Units (LRUs), and Software Replacement Units (SWRUs) should be operated and maintained continuously. In order to effectively manage these activities, it is necessary to develop an Operation Management Tool (OMT). For this purpose, operation management, operation organization, and operation activities were defined. The defined requirements were divided into general, function, interface, and database for OMT development, and functions and decision-making procedures consisting of site/asset/trouble/work order/schedule management were designed. The OMT developed by reflecting the site and asset information as well as the design content met predefined requirements. The OMT will be actively used in actual KASS operation and will evolve by continuously reflecting the additional requirements of operators. Through this tool, KASS will support continuous service provision.

• 한국정보처리학회논문지
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• 제6권4호
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• pp.1009-1021
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• 1999

본 논문에서는 네트워크 상에서의 공동저작을 위한 프로토타입 시스템의 설계원칙과 구조를 기술한다. 본 시스템은 주석 달기와 주석 확인을 위해서 광범위한 문서공간에서의 네비게이션 기능, 문서 locking 과 작업기록을 포함한 작업그룹 모니터 링 및 관리를 위한 도구를 포함하고 있다. 설계된 프로토타입은 인간과 컴퓨터 상호작용, 그룹 사호작용, 그룹지원, 문서구조화의 구현 시험을 위한 testbed로 제공 될 수 있으며, 프로토타입의 개발배경과 문제점도 지적한다.

• 한국항해항만학회지
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• 제46권5호
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• pp.458-470
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• 2022

As the 4th industrial revolution progresses, the application of several cutting-edge technologies such as the Internet of Things, big data, and mixed reality (MR) in relation to autonomous ships is being considered in the maritime logistics field. The aim of this study was to apply the concept of a digital twin model based on Human Machine Interaction (HMI) including a digital twin model and the role of an operator to a ship. The role of the digital twin is divided into information provision, support, decision, and implementation. The role of the operator is divided into operation, decision-making, supervision, and standby. The system constituting the ship was investigated. The digital twin system that could be applied to the ship was also investigated. The cloud-based digital twin system architecture that could apply investigated applications was divided into ship data collection (part 1), cloud system (part 2), analysis system/ application (part 3), and MR/mobile system (part 4). A Mixed Reality device HoloLens was used as an HMI equipment to perform a simulation test of a digital twin system of an 8 m battery-based electric propulsion ship.

• 한국군사과학기술학회지
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• 제12권2호
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• pp.175-181
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• 2009

All of the military aircrafts in Korea Air Force are administered and operated together in the same system regardless of whether they are equipped with the data communication capability or not. The absence of the data communication capability in some of the aircrafts might increase whole kill chain hour at the point of the Network Centric Warfare achievement. Network synergy effects cannot also be desired if the section which is not connected to the network influences to the whole tactical network. Equipping aircrafts with the data communication capability could be done by upgrading the aircrafts, but resulting in high costs and long updating time. This paper is a research about the design and implementation of the UMPC based Data Link System to aircrafts that do not have the data communication capability. The proposed system grafts the UHF-based wireless modem technology and the aircraft flight mission support software onto the off-the-shelf UMPC and GPS system. The employed UHF radio equipment allows communicating tactic data with another aircrafts on the air, the ground control point, and even the Tactical Air Control Party(TACP) control vehicle that achieve missions with aircrafts. It thereby increases such capabilities as navigation aid, situation awareness, quick target identification and attack. We also applied Closed Air Support(CAS) scenarios, which is very close to the real environment, to the experiments of the proposed system. The experimental results show that the proposed system could support the data communication capability effectively and the flight mission at low costs of money and time.

• 한국항행학회논문지
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• 제23권6호
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• pp.584-588
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• 2019

WBAN (wireless body area network)은 비정상적인 건강 상태, 실시간 의료 모니터링, 원격 의료 지원 시스템을 조기에 탐지할 수 있는 네트워킹 기술이다. 최근에 이슈가 되고 있는 건강 관리를 위한 사물 인터넷 (IoT; internet of things)은 인간의 삶의 질을 향상시키는 데 가장 유망한 분야 중에 하나이다. 이것은 다른 통신 시스템과 마찬가지로 의료 통신 시스템의 높은 QoS (quality of service)요구사항을 만족해야 한다. 따라서 WBAN 통신 시스템의 QoS 요구 사항을 수용하기 위해 오류율 (BER; bit error rate) 임계 값을 선택하였다. 본 논문에서는 IR-UWB PPM 변조 방식을 이용한 WBAN 채널의 BER 성능을 계산하고 WBAN의 링크 버짓과 시스템 마진을 다양한 시스템 파라미터에 따라 분석하였다.

• 한국항행학회논문지
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• 제25권6호
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• pp.433-440
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• 2021

어선의 경계소홀에 의한 해난사고는 어선 운용자의 고령화에 따른 문제와 어선에서 협소한 조타실 내부에 설치되는 항해, 통신 및 어로장비 등 여러 개의 단말기와 모니터는 조타실의 해상시야를 방해하는 상태로 설치된다. 또한 복수의 장비에 표시되는 각각의 디스플레이 정보를 확인해야 하는 혼란으로 운용자의 정보인식 능력을 저하시키는 요인으로 작용한다. 따라서 장비들을 간결하게 통합해야 한다는 요구가 제기되어 왔으며, 통합시스템은 전자해도, 통신 및 어군탐지 등으로 다양하게 어선에서 구비해야 하는 장비와 모니터를 하나로 통합하는 것이다. 본 연구는 어선의 협소한 조타실에 설치되는 GPS 플로터, AIS, VHF- DSC, V-pass, 어군탐지기를 하나의 함체에 구성하고, 하나의 MFD (multi function display)에 의하여 운용을 간편화하는 과제이며, 항해중에 데이터통신을 자동운용하는 AIS 와 V-pass 모듈은 실증실험을 통하여 그 성능을 확인하였다. 어선에서 여러 개의 단말기를 통합하여 하나의 화면으로 모든 정보를 제공하고 운용하는 시스템은 해상안전과 어업환경을 크게 개선시킬 수 있다.