• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.40-42
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• 2005

RFID(Radio Frequency Identification)는 자동 인식 데이터 수집 장치의 한 분야로써 GPS장치를 장착한 차량과 같이, RFID 태그(전자태그)를 상품에 부착하여 인식, 추적할 수 있다. 이러한 전자태그 객체는 시간에 따라 경로 정보가 누적되는 이동체와 유사한 특성을 가진다. 그러나 기존의 이동체 색인과 달리 태그 객체의 위치는 판독기의 위치로 인식되며 위치보고가 판독기의 인식영역 안에서만 이루어지므로 보고 주기를 예측할 수 없다. 기존의 이동체 색인에서 전자태그의 특성을 표현하기 힘들기 때문에 전자태그의 특성을 고려란 색인이 필요하게 되었다. 최근 전자태그의 특성을 고려한 색인인 TPIR-Tree(Time parameterized Interval R-Tree)가 발표되었다. 그러나 이 색인은 기존 공간 색인에서의 균등분할 기법을 사용하여 위치보고가 시간의 순서를 가지는 전자태그의 특성을 고려하지 못하여 과거노드의 저장효율이 좋지 못하다. 이 논문에서는 TPIR-Tree의 저장효율 및 검색 성능 향상을 위해서 시간의 순서에 따라 위치를 보고하는 전자태그 객체의 특성을 고려하여 분할축 선정 기법 및 시간축 분할시 비균등 분할정책을 제안한다.

• Journal of Navigation and Port Research
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• v.29 no.9
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• pp.789-793
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• 2005

The container terminals in Korea usually adopts both the bar code and the image recognition systems at the gate complex to capture necessary information on containers passing through the gate. With the rapid advancement of Information Technology(IT) these systems, however, seem to make the user not satisfied due to the inherent limitations such as the long process time taken, low rate of recognition etc., This paper, therefore, examines the adoption of Radio Frequency Identification (RFID) technology to container terminals, and tried to get some implication for the way to improve the productivity of the terminal. The results imply that some improvement in the gate and storage yard operation is feasible by the benefit of using the information of vehicles and containers collected in advance by RFID technology.

• Journal of Sensor Science and Technology
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• v.15 no.4
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• pp.291-296
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• 2006

We focus on the solutions to prevent fatal risk to patient's life caused by transfusing blood which is wrong type or has exceeded norm temperature. Also, this study gives priority to the verification of medical safety of using blood, of which management is applied advanced sensor tag technology adopted RFID(Radio Frequency Identification) temperature sensor and USN(Ubiquitous Sensor Network) for temperature management of blood. Therefore, this study can contribute to protect of health of patients who take blood transfusion through construction of basis of new process of blood management.

• Journal of Korea Society of Industrial Information Systems
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• v.11 no.2
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• pp.98-102
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• 2006

Recent development of Information Technology, the ubiquitous computing environment is on the rise. At the same time, RFID technology and its related applications are actively investigated. In this paper, a portable merchandise information providing system using cheap wireless transmission module is developed in order to overcome the mobility limitation of the wired RFID system. The TRF6901 chipset of 900MHz band from TI is used for the wireless transmission module and the MPS430F149 is used for the MPU. It is expected that the developed system can be applied to numerous innovative wireless applications such as library circulation desk for lending service and automated door system for entrance control.

• Journal of Multimedia Information System
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• v.5 no.2
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• pp.91-98
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• 2018

We devised a bird-borne transceiver unit for S-band packet radio communications based on the CC2500 transceiver, a device manufactured by Texas Instruments (TI). Our assessments determined the optimal parameters needed to achieve successful bird-to-center communication over a distance of 18 km and bird-to-bird communication over a distance of 200 m. These parameters included optimal modulation methods, transmission rates, and antennas. We equipped the transceiver unit with a modified dipole antenna (collinear antenna), which we tested in a 10 m anechoic chamber. Our experimental assessments and circuit design review identified the following parameters: 2FSK modulation method; 14.28 kHz frequency shift; 101.56 kHz IF reception bandwidth; and Manchester encoding (+). Our assessments showed bird-to-bird communications could be achieved over a distance of 200 m assuming MSK, FEC (+), and 500 kbps. Following tests by an official body, we obtained 28 sets of a type approval license for 2.4 GHz. In cooperation with the Yamashina Institute for Ornithology, we attempted to tag and release six or more swans. This unit gives us the ability to obtain vital data on swans. We expect this data to provide significant benefits, including clues on improving screening for infected individuals.

• Korean Journal of Metals and Materials
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• v.47 no.7
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• pp.447-453
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• 2009

Isotropic conductive adhesives (ICAs) have been used or considered as an interconnect material for radio frequency identification (RFID) inlays or other flip chip assemblies due to the advantages of having a low temperature and high-speed bonding. In this work, the curing properties of commercial ICAs for the RFID tag application and the signal transmission in conductive lines that contained the ICA joints were evaluated as a function of the degree of cure at 900 MHz frequency range. The ICAs showed adequate signal transmission only after the curing process passed over the critical time. It was also found that the insertion loss of signal was more dependent on the contact states of Ag fillers in the bondline in preference to the electrical resistance of the ICA itself.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.36-39
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• 2012

IT산업이 발전함에 따라 Bluetooth, ZigBee, RFID(Radio Frequency Identification)와 같은 근거리 무선통신 시스템에 대한 연구가 활발히 진행되고 있으며 다양한 분야에 활용되고 있다. 그 중 NFC(Near Field Communication)의 연구가 활발히 진행되고 있으며, NFC 태그와 함께 사용할 경우 활용성은 더욱 증대된다. 이와 관련하여 현재 다양한 NFC 태그관련 애플리케이션이 존재한다. 하지만 기존의 NFC 태그 애플리케이션은 단일 기능을 중심으로 제공하고, 여러 가지 기능을 이용하기 위해서는 여러 개의 NFC 태그가 필요하다는 단점이 있다. 이 점을 개선하고자 본 논문에서는 단일 NFC 태그로 다양한 기능을 제공하는 애플리케이션을 구현한다. 기능들로는 Text입력과 에어플레인 모드, Wi-Fi, Bluetooth, 무음모드, 알람, 알람설정, 사용자 지정 애플리케이션 선택 및 활성이 있다. 이러한 기능들은 사용자의 상황에 맞게 태그에 입력 시킬 수 있으며, 결과적으로 기존의 단일 기능을 제공하는 애플리케이션보다 개선됨 점을 나타낸다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.699-700
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• 2014

The use of Radio Frequency Identification technology (RFID) in medical context enables not only drug identification, but also a rapid and precise identification of patients, physicians, nurses or any other healthcare giver. The combination of RFID tag identification with structured and secured Internet of Things (IoT) solutions enables ubiquitous and easy access to medical related records, while providing control and security to all interactions. This paper defines a basic security architecture, easily deployable on mobile platforms, which would allow to establish and manage a medication prescription service in mobility context making use of electronic Personal Health Records. This security architecture is aimed to be used with a mobile e-health application (m-health) through a simple and intuitive interface, supported by RFID technology. This architecture, able to support secured and authenticated interactions, will enable an easy deployment of m-health applications. The special case of drug administration and ubiquitous medication control system, along with the corresponding Internet of Things context, is presented.

• Korean Journal of Ecology and Environment
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• v.48 no.2
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• pp.139-145
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• 2015

To investigate seasonal (summer and fall) daily movement of Brachymystax lenok tsinlingensis that inhabit in upper part of the Nakdong River, we attached radio tags to seven individuals (summer: BL1-2; fall: BL3-7) and monitored them at an interval of 2 h. The survey results revealed that the average movement distance per day (m) (${\pm}SD$) of B. l. tsinlingensis was $182.4{\pm}79.2m$, and most of the individuals migrated within 1 km as their habitat boundary. The maximum movement distance per day (m) and the home range (m) during summer season were $550.5{\pm}75.5m$ and $649{\pm}53m$, respectively, compared to $283.8{\pm}55.1m$ and $186{\pm}32m$ during fall season. From these findings, it can be inferred that B. l. tsinlingensis exhibits seasonal changes in the distance of daily movement; however, it generally covers short distances without leaving the habitat boundaries during both seasons. The seasonal daily movement of B. l. tsinlingensis established in this study is expected to be useful in preserving their population.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.9
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• pp.802-810
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• 2012

This paper describes RFID(Radio Frequency Identification) based target acquisition and docking system. RFID is non-contact identification system, which can send relatively large amount of information using RF signal. Robot employing RFID reader can identify neighboring tag attached objects without any other sensing or supporting systems such as vision sensor. However, the current RFID does not provide spatial information of the identified object, the target docking problem remains in order to execute a task in a real environment. For the problem, the direction sensing RFID reader is developed using a dual-directional antenna. The dual-directional antenna is an antenna set, which is composed of perpendicularly positioned two identical directional antennas. By comparing the received signal strength in each antenna, the robot can know the DOA (Direction of Arrival) of transmitted RF signal. In practice, the DOA estimation poses a significant technical challenge, since the RF signal is easily distorted by the surrounded environmental conditions. Therefore, the robot loses its way to the target in an electromagnetically disturbed environment. For the problem, the g-filter based error correction algorithm is developed in this paper. The algorithm reduces the error using the difference of variances between current estimated and the previously filtered directions. The simulation and experiment results clearly demonstrate that the robot equipped with the developed system can successfully dock to a target tag in obstacles-cluttered environment.