• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.2
• /
• pp.421-426
• /
• 2016

Recent developments in internet technologies has enabled widespread growth of embedded systems like Arduino, Raspberry Pi and other smart home systems. A research in the industrial sector on the utilization of the board has been made. The development needs of the embedded board in a reagent bottle case system has been highlighted. Current reagent Management System has to hold and manage the reagent itself is mostly to save the program using handwritten or machine. In addition, there is a risk to the system during the vulnerable zone administrator to manage the situation of the reagent bottle case can lead to a massive fire. In this paper, reagent bottle case RFID readers and data in real-time is monitored by attaching a sensor management through the database and sends a warning message to the mobile device of the administrator in real time during hazardous situations in the reagent bottle case. This is improve the reliability and efficiency of reagent bottle case.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.1
• /
• pp.68-75
• /
• 2013

Recently IPTV that transmits multimedia contents in real time through internet, cable TV net and satelite net gets the limelight. But IPTV service that gives service to users by various media has a problem of not supporting user certification fully. This paper suggests a certification model which prevents getting access permission of IPTV service by sending illegal certification information by adolescent through integrating mobile communication technique with RFID(Radio Frequency IDentification) technique which is a key technique of Ubiquitous environment. This model performs the process of adult certification by keeping synchronization with user's certificaiton information that is saved in data-base of certification server and contents server after getting the system of class categorization in contents server to overcome disadvantage of simple adult certification system that is popular in the existing internet. Also, it adapts double hash chain technique not to down load illegally contents without the permission of manager even if an adolescent gets manager's approval key.

• Journal of KIISE:Software and Applications
• /
• v.33 no.12
• /
• pp.1022-1030
• /
• 2006

The location awareness is an important part of many ubiquitous computing systems, but a perfect location system does not exist yet in spite of many researches. Among various location tracking systems, we choose the RFID system due to its wide applications. However, the sensed RSSI signal is too sensitive to the direction of a RFID reader antenna, the orientation of a RFID tag, the human interference, and the propagation media situation. So, the existing location tracking method in spite of using the particle filter is not working well. To overcome this shortcoming, we suggest a robust location tracking method with a double layered structure, where the first layer coarsely estimates a tag's location in the block level using a regression technique or the SVM classifier and the second layer precisely computes the tag's location, velocity and direction using the particle filter technique. Its layered structure improves the location tracking performance by restricting the moving degree of hidden variables. Many extensive experiments show that the proposed location tracking method is so precise and robust to be a good choice for implementing the location estimation of a person or an object in the ubiquitous computing. We also validate the usefulness of the proposed location tracking method by implementing it for a real-time people monitoring system in a noisy and complicate workplace.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.26 no.10
• /
• pp.885-894
• /
• 2015

In this paper, it can be applied to a walkie-talkie, the RFID / USN 920 MHz band(917~923.5 MHz) and WiFi 2.4GHz band(2.4~2.483 5GHz) return loss is 10 dB over the band, on-board dual band with omni-directional radiation characteristics is proposed. The basic structure designed antenna is used meander monopole antenna. It was used as double stubs and tabs for antenna designs that meet the criteria proposed. The double stub and the tab affects the reactance of the antenna to form a common-mode and differential-mode in the stub to improve the antenna characteristics and return loss in the bandwidth, gain and radiation characteristics. The system size of walkie-talkie is $52{\times}77mm^2$, the size of the antenna is limited to $52{\times}15mm^2$, the thickness of FR4 dielectric substrate is 0.8 mm, FR4 dielectric constant 4.4 is used. For experimental results, the return loss is measured more than 10 dB, the maximum gain is measured 1.95 dB, the maximum bandwidth is measured 360 MHz, the radiation characteristic is measured omni-directional. By a walkie-talkie terminal design applying the results of the paper, the handset's price competitiveness and production efficiency can be improved.

• Journal of Satellite, Information and Communications
• /
• v.10 no.2
• /
• pp.80-85
• /
• 2015

In this paper, we present, an indstrial RFID layered microstrip patch antenna is designed using an inset feed method in order to improve recognition rates in a long distance as tags are attached to metal object by improving a problem of feeding power in fabricating metal tags and reducing effects of metallic object. The inset feed shows a distinctive characteristic that has no separation between emitters and feed lines differing from a structure with the conventional inductive coupling feed. This structure makes possible to produce a type that presents a low antenna height and enables impedance coupling for tag chips. Although it shows a difficulty in the impedance coupling due to increases in the parasite capacitance between a ground plane and an emitter in an antenna according to decreases in the height of a tag antenna, it may become a merit in designing the tag antenna because the antenna impedance can be determined as an inductive manner if a shorted structure is used for feeding power. Therefore, in this paper the microstrip patch antenna is designed as a modified type and applies the inset feed in order to reduce effects of metallic objects where the antenna is be attached. Also, the antenna uses a multi-layer structure that includes a metal plate between radiator and ground instead of using a single layer.

• Proceedings of the Korea Contents Association Conference
• /
• 2015.05a
• /
• pp.373-374
• /
• 2015

스마트폰에 대한 사용빈도와 그 기술에 대한 관심이 높아지고 있는 현대사회에서는 다양한 응용 서비스를 만족하기 위한 위치기반 서비스의 필요성이 증대하고 있으며, 특히 Wi-Fi 기반의 실내 측위는 RFID와 같이 측위를 위한 추가 장비가 필요하지 않은 장점을 가지고 있기에, 본 연구에서는 다양한 측위 기술 가운데 오차 범위가 적은 Fingerprinting 방식에 무선 네트워크에서 대표적으로 사용되는 IEEE 802.11를 기반으로 KNN 방식을 이용한 실내 측위 시스템을 제안한다.

• Proceedings of the Korea Contents Association Conference
• /
• 2011.05a
• /
• pp.385-386
• /
• 2011

본 연구의 목적은 전자식별 체계를 식품인증에 적용해 농식품의 안전성, 기능성을 인증하고 농식품 품질인증 마크와 연동한 효과적인 식품인증 방안을 제시하는 것이다. 또한 전자인증 기술을 활용해 농식품 품질을 손쉽게 확인하고, 주요 식품정보를 언제, 어디서나 활용할 수 있는 방안을 제시하고자 한다. 최근 모바일 기술을 활용한 QR코드 기반의 전자인증이 여러 사업 분야에서 사용되고 있는데, 이를 식품인증에 적용하여 식품인증의 효과성, 효율성, 편의성을 증진시킬 것으로 기대한다. 또한, 본 연구를 통하여 물류, 제조, 생산, 유통 산업에서 활용하고 있는 전자인증 체계(RFID, 바코드, QR코드 등)를 식품인증에 적용하여 식품상품의 정보를 손쉽게 확인하고 식품 정보조회를 통해 식품 품질을 검사하는데 사용할 수 있을 것으로 기대한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2021.11a
• /
• pp.167-169
• /
• 2021

본 논문에서는 아두이노와 라즈베리 파이를 기반으로 연동한 스마트 금고 시스템을 제안한다. 기존의 금고와 달리 보안성과 편리성의 취약점을 해결하도록 했다. 아두이노와 라즈베리 파이 기반의 다양한 센서를 이용해 스마트 금고의 보안성과 편리성을 높이도록 제안한다. 구현을 위해 지문인식 센서, RFID 센서, 키 패드, GPS, 충격감지 센서, 파이 카메라, PIR 센서를 사용한다. 또한, 스마트 금고 상태와 조작을 할 수 있는 어플리케이션을 제작해 편리성을 높이도록 했다. 금고 프로토 타입의 외부 재질은 3D 프린팅을 이용하여 제작을 했다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.2
• /
• pp.508-516
• /
• 2010

An autonomous and automatic home mess-cleanup robot is newly developed in this paper. Thus far, vacuum-cleaners have lightened the burden of household chores but the operational labor that vacuum-cleaners entail has been very severe. Recently, a cleaning robot was commercialized to solve but it also was not successful because it still had the problem of mess-cleanup, which pertained to the clean-up of large trash and the arrangement of newspapers, clothes, etc. Hence, we develop a new home mess-cleanup robot (McBot) to completely overcome this problem. The robot needs the capability for agile navigation and a novel manipulation system for mess-cleanup. The autonomous navigational system has to be controlled for the full scanning of the living room and for the precise tracking of the desired path. It must be also be able to recognize the absolute position and orientation of itself and to distinguish the messed object that is to be cleaned up from obstacles that should merely be avoided. The manipulator, which is not needed in a vacuum-cleaning robot, has the functions of distinguishing the large trash that is to be cleaned from the messed objects that are to be arranged. It needs to use its discretion with regard to the form of the messed objects and to properly carry these objects to the destination. In particular, in this paper, we describe our approach for achieving accurate localization using RFID for home mess-cleanup robots. Finally, the effectiveness of the developed McBot is confirmed through live tests of the mess-cleanup task.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.23 no.4
• /
• pp.593-607
• /
• 2013

The In-Vehicle-Networking(IVN) of modern cars is constituted by an small electronic control device called ECU. In the past, there was no way to be able to access the IVN of a driving car. so IVN has been recognized as a closed environment so there is no need to exist authentication protocol between devices which are to configure the internal network and to communicate with other devices. However, constant improvements made it possible to access the IVN in many different ways as the communication technology evolves. This possibility created a need for device authentication in IVN. HB-Family are representative authentication schemes in RFID environment which has similar restrictions to IVN. In this paper, we propose an implementation method of HB-Family for device authentication between ECU considering ECU has low computing power and the message field of CAN protocol has restricted size of 8 bytes. In order to evaluate the efficiency and availability of the authentication schemes adopted our method, we have evaluated the performance based on DSP-28335 device. Further, it was possible to improve the efficiency rate of at lest 10%, up to 36%, and we then analyze this result in various aspects of the IVN.