• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.37 no.1C
• /
• pp.34-37
• /
• 2012

The paper introduces the an necklace type UHF RFID tag for a live tree having high dielectric constant. When a general UHF RFID tag is used for the metal and the material with high dielectric constant, the electrical characteristics and impedance of antenna have been changed, and the tag is not recognized by an UHF RFID reader. The necklace type UHF RFID tag has been designed with consideration of the high dielectric constant of the tree material. The name tag for a live tree has been designed with the developed tag antenna. The performance of tag has been measured and the reading range is about 4~5m. The developed UHF RFID tag antenna can be applied to any high dielectric material for various industrial applications.

• Proceedings of the IEEK Conference
• /
• 2002.06a
• /
• pp.199-202
• /
• 2002

This paper is about the implementation of Passive RFID(Radio Frequency Identification) tag system using a capacitive method, and explains the design and circuit's structure of this system. Fundamentally the capacitive RFID tag system consists of a tag reader, a passive tag and a host computer. And then this paper shows the system's prototype which analyzes a specification, and suggests the passive RFID system as a new method which manufactures a low cost tag system easily

• The Journal of the Korea Contents Association
• /
• v.15 no.8
• /
• pp.9-17
• /
• 2015

One of RFID features is that each RFID tag has a unique identifying code. Logistic System utilizes RFID tag as location tracing, understanding stock or etc. On the other hand, there is a problem of overall lower recognition rate by getting the information of non-mobility tags with no need for reading. To solve this problem, we trace and analyze variation of moving and moveless RFID tag sensitivity by the hour. In analyzed data, we verify that tag sensitivity of mobile RFID is gradually increase while non-mobility tag has same intensity value. In order to detect mobile tag, we generate a function using Matlab with analyzed data and separate moving tags from non-mobility tags by software. As a result, we can confirm that non-mobility tags are detected by software and recognition rate of RFID tag is improved by separating moveless tag.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.15 no.1
• /
• pp.195-202
• /
• 2011

RFID(Radio Frequency IDentification) is a system to identify objects and its usage is being extended to distribution, healthcare, and air&port etc. RFID is a contactless system environment, and reducing tag authentication time is important because multiple tags are identified at the same time. Studies about RFID system so far is, however, mostly to improve security vulnerability in the tag authentication process. Therefore, this paper suggests an efficient scheme to decrease the time of tag authentication which is also safe for the security of tag authentication process. The proposed scheme cuts down on the tag ID search time because it searches only the classified relevant ID in the database, which is one of many components of RFID system, by using identification bits for tag ID search. Consequently, the suggested scheme decreases process time for tag ID authentication by reducing the processing time and the load of the database. It also brings performance improvement of RFID system as it improves the energy applicability of passive tag.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.1B
• /
• pp.62-67
• /
• 2010

Our research group has investigated that RFID tag packaging development and RFID tag flip chip bonding method influences on the industry-environmental customized RFID tag development that has applications to various industry environmental conditions. RFID tag flip chip bonding is consisting with wire bonding, ultrasonic bonding, heat plate bonding, and laser bonding and those methods are also depending on the different RFID tag development. Our research data shows that, among the various industrial environments such as an extremely high temperature, cryogenic, high-humidity, flexible, high-durable, development of RFID tag in an extremely high temperature is inappropriate for laser bonding method, converting of heat energy as absorbing light energy or heat plate bonding method of straight heat transferring manner, on the other hand, is suitable for wire bonding method which directly connect bump to pattern using wire.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.18 no.3 s.118
• /
• pp.282-287
• /
• 2007

A circular UHF RFID tag has been designed. This circular tag antenna can be optimized simply by controling two parameters, outer radius and inner radius of the tag antenna. The resistance and resistance values of the tag antenna have been researched based on the variation of inner and outer radii of the circular tag antenna. The simulation and measurement results are compared.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.8
• /
• pp.1519-1525
• /
• 2008

Recently we are limiting use of toxic material of lead, mercury, cadmium, hexavalent chromium, PBB, etc. by a nation environment regulation guidance in Europe, the United States, China and Japan. In this paper, we developed manufacture method and RHD tag of environment material using Hanji, Broussonetia Kazinoki Siebold, and PLOYCABONATE, etc. The developed RFID tag stick to each layer interval using environment material which is minimized environment pollutant.

• Proceedings of the Korea Inteligent Information System Society Conference
• /
• 2007.11a
• /
• pp.423-429
• /
• 2007

본 논문은 RFID 시스템 상의 RFID Tag의 보안 취약점을 보완하는 방법을 제시한 논문으로서 임의로 취득한 RFID 태그의 데이터를 불법적으로 위조하는 것을 회피하는 알고리즘을 제시한다. 현재까지 제안된 RFID Tag의 보안 문제 해결방법들은 일정정도의 계산능력을 가진 칩을 내장해야만 구현기 가능하기 때문에 작은 메모리 용량을 갖는 수동형 RFID Tag를 사용하는 현업에서는 해당 알고리즘을 적용하는 것이 불가능했다. 본 논문에서 제시하는 방법은 기존 RFID Tag 보안문제 해결방법에서 제시한 해싱 함수를 사용하지만 해싱함수를 Tag에 내장하지 않고 해싱 키를 내장함으로서 현실적용이 가능하도록 하였다. 본 논문에서 제시한 방법을 통해 FRID Tag의 내용을 임의로 바꾸는 것을 회피할 수 있다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.8
• /
• pp.1943-1949
• /
• 2010

In this paper, we developed a RFID tag antenna using one-sheet inlay pattern which consist of two different frequencies in one layer. The antenna in one-sheet inlay RFID tag does not use different kind RFID antennas in a card but implement 13.56MHz and 900MHz RFID tag antennas in one sheet. In order to evaluate the usability of proposed method, we configured test equipments and designed 6 different patterns and test the recognition distance of each pattern. Among the one-sheet inlay RFID tag antenna designs, the pattern no.5 has good performance with recognition distance of 5.34m at 900MHz and 3.5m at 13.56MHz.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.4 no.4
• /
• pp.51-62
• /
• 2008

In this paper, the proposal system can achieve the more safety of RFID System with the 2-step authentication procedures for the enhancement about the security of general RFID systems. After authentication RFID Tag, additionally, the proposal system extract the characteristic information in the user image for acquisition of the additional authentication information of the user with the camera. In this paper, the system which was proposed more enforce the security of the automatic entrance and exit authentication system with the cognitive characters of RFID Tag and the extracted characteristic information of the user image through the camera. The RFID system which use the active tag and reader with 2.4GHz bandwidth can recognize the tag of RFID in the various output manner. Additionally, when the RFID system have errors, the characteristic information of the user image is designed to replace the RFID system as it compare with the similarity of the color, outline and input image information which was recorded to the database previously. In the result of experiment, the system can acquire more exact results as compared with the single authentication system when it using RFID Tag and the information of color characteristics.