• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.7
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• pp.1026-1031
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• 2002

In this Paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a W:.u data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.187-191
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• 2002

In this paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a VHF data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.4
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• pp.403-411
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• 2014

In this paper, an algorithm of extracting the features of home appliances and automatically building a database to identify home appliances is designed and presented. For the verification, a software library supporting this algorithm is implemented and added to an power management system server, which was already implemented to support real-time monitoring of home appliances' power consumption status and controlling their power. The implemented system consists of a system server and clients, each of which measures the power consumed by a home appliance plugged in it and transmits the information to the server in real-time over a wireless network. Through experiments, it is verified that it is possible to identify any home appliance connected to a specific client.

• Journal of KIISE
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• v.43 no.8
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• pp.848-856
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• 2016

Seeking and recognizing maritime targets are very important tasks for maritime safety. While searching for maritime targets using radar is possible, recognition is conducted without automatic identification system, radio communicator or visibility. If this recognition is not feasible, radar operator must tediously recognize maritime targets using movement features on radar base on know-how and experience. In this paper, to support the radar operator's mission of continuous observation, we propose an algorithm for automatic recognition of an unknown ship using movement features on radar and a method of detecting potential ship related accidents. We extract features from contact range, course and speed of four types of vessels and evaluate the recognition accuracy using SVM and suggest a method of detecting potential ship related accidents through the algorithm. Experimentally, the resulting recognition accuracy is found to be more than 90% and presents the possibility of detecting potential ship related accidents through the algorithm using information of MV Sewol. This method is an effective way to support operator's know-how and experience in various circumstances and assist in detecting potential ship related accidents.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.4
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• pp.407-413
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• 2011

This paper presents an electrical power monitoring system for home energy management and an automatic appliance-identification algorithm based on the electricity-usage patterns collected during the monitoring tests. This paper also discusses the results of the field tests of which the proposed system was voluntarily deployed at 13 homes. The proposed monitoring system periodically measures the amount of power consumption of each appliance with a pre-specified time interval and effectively displays the essential information provided by the monitored data which is required users to know in order to save power consumption. Regarding the field tests of the monitoring system, the households responded that the system was useful in saving electricity and especially the electricity-usage patterns per appliances. They also considered that the predicted amount of the monthly power consumption was effective. The proposed appliance-identification algorithm uses 4 patterns: Zero-Crossing Rate(ZC), Variation of On State(VO), Slope of On State(SO) and Duty Cycle(DC), which are applied over the 2 hour interval with 25% of it on state, and it yielded 82.1% of success rate in identifying 5 kinds of appliances: refrigerator, TV, electric rice-cooker, kimchi-refrigerator and washing machine.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.16-18
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• 2010

유비쿼터스 컴퓨팅 환경에서 다양한 위치 기반 서비스(LBS)를 위해 객체 식별은 필수적인 기술이다. 객체 식별을 위해서 영상 분석 식별, 무선 신호(RF: Radio Frequency) 식별, MIT Cricket 시스템의 RF 신호와 초음파를 활용한 객체 식별 등의 시스템들이 제안되었다. 그 중 가장 널리 이용되는 Cricket 시스템은 RF 신호에 객체의 식별 정보를 포함시켜 초음파 신호와 동시에 송신하고, 수신단에서 RF 신호의 정보를 통해 객체를 식별하는 방식을 이용한다. 하지만 유비쿼터스 컴퓨팅 환경에서 이용되는 단말 노드의 소형의 특성을 유지하기위해 다수의 장치 모듈을 내장하기 힘들다. 본 논문에서는 신호의 정확도가 높은 초음파를 활용하여 RF 통신모듈 없이 신호 중첩 분석으로 통해 다중 객체를 인식하기 위한 기술을 제안한다. 본 논문에서 제안하는 알고리즘의 가능성을 시뮬레이션을 통해 입증하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.695-698
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• 2014

As most the scanning systems developed until now provide radiation scan plane images of the inspected objects, there has been a limitation in judging exactly the shape of the objects inside a logistics container exactly with only 2-D radiation image information. Two 2-dimensional radiation images which have different disparity values are acquired from a newly designed stereo image acquisition system which has one additional line sensor to the conventional system. Using a matching algorithm the 3D reconstruction process which find the correspondence between the images is progressed. In this paper, we proposed a new volume based 3D reconstruction algorithm and experimental results show the proposed new volume based reconstruction technique can provide more efficient visualization for cargo inspection. The proposed technique can be used for the development of the high speed and more efficient non-destructive auto inspection system.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2756-2758
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• 2005

본 논문에서는 제어시스템의 신뢰성 향상을 위한 고장허용제어계를 실현하기 위하여, 함수관측자를 도입한 장치고장검출(IFD)기법 및 고장보상알고리즘을 제안하고, 이를 전형적인 불안정 비선형시스템인 역진자제어계에 적용하였다. 제안된 IFDS는 기존의 다중관측자기법과 동일한 구조를 가지지만 최저차 설계가 가능한 미지입력 함수관측자를 채택함으로서 알고리즘의 단순화를 가하였을 뿐 아니라 고장량의 추정 등 다양한 설계목적을 고려하여 설계될 수 있다는 특징을 가진다. 제안된 고장 검출식별 기법의 제안된 역진자제어계를 위한 제어기, 고장검출식별 및 보상알고리즘을 모두 포함한 상태에서 고장허용제어의 가능성을 검증하였다.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2793-2795
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• 2005

고장검출식별시스템의 성능을 좌우하는 가장 중요한 요소는 잔차발생알고리즘이다. 잔차발생기구는 측정된 입출력변수 정보에 근거하여 설계되며 고장의 검출 및 식별이 가능하도록 감결합(decoupling) 특성을 가져야 한다. 본 논문에서는 전달함수 접근 방법 중 최근 제안된 최소차 다항식 기저(minimal polynomial basis)를 이용한 잔차발생기구 설계기법을 소개하고, 이를 VTOL의 센서 및 구동장치고장 검출에 적용하여 그 성능을 검토하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.979_980
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• 2009

본 논문에서는 PHEV와 EV의 보급 확대에 따른 충전 시스템 사용자 혹은 관리자의 사고 방지 및 효율적인 충전 시스템의 운용을 위해서 차량내 배터리와 충전 시스템의 상태를 모니터링 할 수 있는 충전 모니터링 시스템의 구조와 충전 프로세스 알고리즘을 제안하고자 한다. 충전 모니터링 장치는 유/무선 통신기술을 적용하여 차량을 식별함으로써 효율적인 차량 관리 및 충전 시스템 운용이 가능하며 충전 시스템 내의 정보 교환, 충전 동작/정지 제어 등을 위한 차량과의 인터페이스 기술과 통신 프로토콜 등 다양한 기능이 필요하다. 본 논문에서는 충전 모니터링 장치용 제어기와 충전 전력량 및 상태 표시가 가능한 충전 모니터링 장치와 충전 알고리즘을 제안한다.