2016, Vol.11, No.2

Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

pISSN : 1975-7700 / eISSN : 2734-0570
https://journal.kci.go.kr/kkits

This paper aims to examine on the reading of RFID tags and tag data used to manage the waterworks facilities. Waterworks facilities, depending on the location where you want to install, are divided into the ground facilities and underground facility. It is the way how to manage these facilities that use the identification index of the installed facility. One of the way how to use the identification display is a way to manage and search for RFID or NFC tag. There is the strength in the aspect that the way using NFC tag is possible to be active by smartphone without a dedicated reader. However, NFC tag reading has to contact and read proximately. Most of waterworks facilities are not able to use smartphone because it is difficult to read tag by smartphone and protect telecommunication security, caused by the area of facility. Because the waterworks facilities are composed of metal, when people use RFID tag, people can't search anything. This paper solved the issue with using as anti-metal RFID tag on the 900 MHz frequency being available of metal material. This paper proposes a system which users easily get and treat information in the case of the dealing with the waterworks facility with the RFID reader, notebook with bluetooth, monitoring program, the control of database and the RFID reader system, being equipped to facilities. The system development environment has been built based on C# and tag information management database was built using the MySQL.

Due to the advanced development of wireless technologies, mobile communication systems have developed into a 4G LTE system, recently. It is important to implement the antenna with a small size and a broadband characteristic for the 4G LTE system. It have been considered to use magnetic materials for the mobile antenna implementation. However, because of the high loss of magnetic materials in the UHF band, it is in fact difficult to apply the antenna of cellular frequency bands. So, the magnetic materials is applied mainly to the low frequency antenna using several tens of MHz as like NFC antenna. To overcome the frequency limit according to the loss of the magnetic materials, it has been researched for low-loss magneto-dielectric materials available in the cellular frequency band. In this paper, the antenna structure with magneto-dielectric material sheet is proposed so as to minimize the loss of magnetic material in the cellular frequency band. The magneto-dielectric material sheet is shaped with hexa-ferrite composites which is fabricated by Samsung Electro-Mechanics Co., Ltd. By applying the magneto-dielectric sheet to the mobile phone antenna of the cellular frequency band, it is demonstrated by measuring the advanced performance characteristics of the antenna resulting a compact size and wide-band characteristics.

Growth environment and conversations with people of children is the most important time as education and emotionally. During this time, encouragement , praise, consultation is the main task of the kindergarten and nursery school teachers. But Praise and encouragement is always well-being well done compared to advice and consultation. In addition childrens does not describe or explain their trouble and worries to parents and teachers as well. Due to advances of smartphone, enables video calling, instant messaging and other services have used cameras, and wireless network technology increased processing capacity, as well as equip the 3D teleconferencing parent education , children, youth education development plan study being conducted actively. Transfer the video and audio of the smart phone to the server using the RTP and The server control and monitoring of the client. In this paper, suggesting the service which will give courage and confidence and can opens the heart and communicates with child instead of parents or teachers, by a friendly avatar in small, simple and smart phones, those are applied of increasingly developing hardware technology advantages.