• Journal of Digital Contents Society
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• v.9 no.3
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• pp.483-490
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• 2008

In this paper, we propose an active location acquisition terminal needing to construct an infrastructure based on a LBS and analyze the performance in real field. The proposed terminal is compounded with a GPS module and a CDMA module, so it can get the location information independently using satellite GPS signal and the proposed terminal can decide a user location with the location information of a base station in satellite GPS shadowed area. This is the distinguishable location acquisition method from the conventional A-GPS, and it complements a disadvantage of the conventional GPS. From these results, we can confirm that the proposed active location acquisition terminal is suitable to the requirements for the LBS which are the independent location acquisition ability, the continuity in the location information acquisition and the maintenance in the location information security.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.10a
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• pp.365-368
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• 2004

유비쿼터스에 대한 인프라의 증가로 수많은 터미널들이 연동되어 우리 생활 주변에 자리 잡아 가고 있으며 정부와 개인, 사업장, 일상생활에 많은 영향을 미치는 차세대의 컴퓨팅 패러다임으로 다가오고 있다. 다양한 센서 기술들 중에 능동형 RFID를 사용하면 실세계에서 사용자들의 위치정보를 신속하고, 정확하게 파악하여 사용자의 위치에 따른 정보 제공을 지능적이고 효율적으로 할 수 있다. 본 논문에서는 병원에서 능동형 RFIB 시스템을 이용한 정보의 획득과 활용에 관한 API의 설계와 구현을 위한 기본적인 방법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.575-578
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• 2005

위치기반 서비스 시스템은 유비쿼터스 환경으로의 변화와 함께 여러 응용모델과의 접목으로 가치창출에 대한 가능성이 높은 분야이다. 기존의 버스교통시스템은 Active Badge System 또는 GPS 수신정보를 이용한 일방적 push 형태로 현재위치에 대한 정보만을 사용자에게 알려주었으며 그 정보를 접할 수 있는 특정한 장소가 아니면 정보를 획득할 수 없는 시스템이다. 이 논문에서 제안하는 지능형 버스교통정보 시스템은 근거리 무선 통신이 가능하며 측위시스템을 활용할 수 있는 단말기와, 버스교통의 정보를 담고 있는 ITS(Intelligent Transport System)의 권역교통정보센터서브시스템(RTICS)에 호스트를 이동하면서 사용자 대신 업무를 수행하는 객체인 이동 에이전트를 적용한 시스템으로서, ITS API 표준을 요구하지 않으며 단말기를 소지한 사용자가 어느 곳에서든 능동적으로 버스교통에 대한 다양한 정보를 획득 할 수 있다.

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.3
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• pp.267-272
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• 2012

This paper propose the implementation of robust fuzzy controller for controlling an active magnetic bearing (AMB) system with 6 degree of freedom (DOF). A basic model with 6 DOF rotor dynamics and electromagnetic force equations for conical magnetic bearings is proposed. The developed model has severe nonlinearity and uncertainty so that it is not easy to obtain the control objective. For solving this problem, we use the Takagi-Sugeno (T-S) fuzzy model which is suitable for designing fuzzy controller. The control object in the AMB system enables the rotor to rotate without any phsical contact by using magnetic force. In this paper, we analyze the nonlinearity of the active magnetic bearing system by using fuzzy control algorithm and desing the robust control algorithm for solving the parameter variation. Simulation results for AMB are demonstrated to visualize the feasibility of the proposed method.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.219-222
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• 2009

자유시점 비디오는 단순히 수동적으로 비디오를 보는 것이 아니라 원하는 시점을 자유로이 선택하여 보는 능동형 비디오이다. 일반적으로 다양한 위치 및 다양한 각도에 위치하는 다수의 카메라로부터 촬영된 영상을 이용하여 제작하는데, 이 기술은 박물관 투어, 엔터테인먼트 등의 다양한 분야에서 활용된다. 본 논문에서는 자유시점 비디오의 새로운 분야로 한 장의 영상을 가상 카메라와 깊이맵을 이용하여 영상 내부를 네비게이션하는 자유시점 입체 Tour-Into-Picture (TIP)을 제안한다. 오래전부터 TIP가 연구되어 왔는데, 이 분야는 한 장의 사진 내부를 탐험하면서 애니메이션으로 볼 수 있게 하는 기술이다. 제안 방법은 전처리과정으로 전경 마스크, 배경영상, 및 깊이맵을 자동 및 수동 방법으로 구한다. 다음에는 영상 내부를 항해하면서 투영 영상들을 획득한다. 배경영상과 전객객체의 3D 모델링 데이터를 기반으로 가상 카메라의 3차원 공간 이동, yaw, pitch, rolling의 회전, look-around effect, 줌인 등의 다양한 카메라 기능을 활용하여 자유시점 비디오를 구현한다. 또한 깊이정보의 특성 및 구조에 따라 놀라운 시청효과를 전달하는 카메라 기능의 설정 방법을 소개한다. 소프트웨어는 OpenGL 및 MFC Visual C++ 기반으로 구축되었으며, 실험영상으로 조선시대의 작품인 신윤복의 단오풍정을 사용하였고, 입체 애니메이션으로 제작되어 보다 실감있는 콘텐츠를 제공한다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.4
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• pp.149-157
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• 2011

Passive tags are inferior to active tags in processing efficiency, so they have difficulty in largevolume processing. The proposed protocol reduces the volume of computation in passive tags and, at the same time, improves authentication for enhanced safety and security. That is, different from existing RFID protocols that return the same value even if an error happens when the reader reads a tag, the improved RFID security protocol returns a new value using a re-counter and processes the computation part of a tag in the reader or in a back.end system. Even if the information of a tag is acquired by an malicious way, it is not actual information but encrypted information that is not usable. In addition, even if tag information is read in sequence, it is changed in each read, so the protocol is safe from Location Tracking.

• Journal of the Korea Society of Computer and Information
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• v.16 no.9
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• pp.131-143
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• 2011

Previous alerting service based on LBS was caused severe overload problem of server by using the method to confirm the location of each moving object on server. In this paper, by loading an App on smart moving object, we proposed a novel algorithm named ADAS(Active Disaster Alert Service) for accessing to the server site with oneself location information as needed and implemented the disaster alerting service system with visualization for user. In the proposed method, running App access to the server periodically with the present location coordinate gained from GPS module or network module and the ID of moving object. Then, the server compare the present location coordinate of moving object and the coordinates of disasters registered in DIDB and transmit the n NDIs existed in near distance orderly from the coordinate of present moving object to the client. The App compares the coordinate of present location for moving object and the coordinates of NDI is transmitted from server by real time and executes the service with classifying levels of alert into three steps such as danger, carefulness and safety. And new NDIs are gained by accessing DIDB on Server periodically during running App. Therefore, this will be become a novel method for reducing fundamentally the server overload problem in comparison with previous alerting service that the career of moving object is managed on server.

• Journal of the Korean Society for Railway
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• v.11 no.3
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• pp.286-293
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• 2008

In this paper, u-FOS system is applied to field test in order to design the code structure based on standards and both 900MHz passive and 2.45GHz active RFID devices were used to test identification capacity in the field tests. For the stable RFID data obtainments, optimum speed of trucks and rail cars and most suitable tagging locations on them were resulted from field tests. The data obtained from ground logistics base and identified through the system is sent to u-FOS. Because the code structure is designed in the form of KKR code structure, this system can be implemented on RFID ODS network without difficulty. Therefore, we suggested the result as a guideline for corporations and government agencies to easily adopt the system.

• Journal of the Institute of Convergence Signal Processing
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• v.18 no.1
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• pp.21-24
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• 2017

Passive millimeter wave (MMW) imaging penetrates clothing to detect concealed objects. The distances extraction to the concealed objects is critical for the security and defense. In this paper, we address a passive stereo 3 mm MMW imaging system to extract the longitudinal distance to the concealed object. The concealed object area is segmented and extracted by the k-means clustering algorithm with splitting initialization. The distance to the concealed object is estimated by the corresponding centers of the segmented objects. In the experimental two pairs (each pair for horizontal and vertical polarization) of stereo MMW images are obtained to estimate distances to concealed objects.

• Journal of Advanced Navigation Technology
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• v.16 no.2
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• pp.264-270
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• 2012

e-Training focusing on the experience and practice accelerates actual-active learning and enforces the learning effects against the existing theory based education. The most typical hans-on training system is augmented reality. Especially, in the training field installed augmented reality system, the automobile maintenance trainee experiences effective training with the immediate information, which is indicating the location of parts and the procedure of repairing. The tracking is the core technology of the augmented reality system. The performance of augmented reality system depends on the tracking technology. Therefore, this paper suggests the tracking technology which is proper to the e-Training augmented reality service technology for the car mechanics.