This study investigates the influence of sintering temperature on the magnetic properties and frequency dispersion of the complex permeability of Ni–Zn–Cu ferrites used for magnetic shielding in near-field communication (NFC) systems. Sintered specimens of (Ni0.7Zn0.3)0.96Cu0.04Fe2O4 are prepared by conventional ceramic processing. The complex permeability is measured by an RF impedance analyzer in the range of 1 MHz to 1.8 GHz. The real and imaginary parts of the complex permeability depend sensitively on the sintering temperature, which is closely related to the microstructure, including grain size and pore distribution. In particular, internal pores within grains produced by rapid grain growth decrease the permeability and increase the magnetic loss at the operating frequency of NFC (13.56 MHz). At the optimized sintering temperature (1225-1250°C), the highest permeability and lowest magnetic loss can be obtained.

As a rapid proliferation of mobile system environment may induce a number of changes, NFC technology is also evolving, and it is being applied in many fields. In this paper, we propose a skin care technology inter-working smart communication devices. Without the use of expensive skin care device, a cosmetic container is implemented to have a smart function, used by the users over a long period of time. It acquires the user's biometric information from the smart container and transmits it to the user's terminal over a short-range wireless communication in order to provide counseling app information such as health care.

This study investigated the magnetic properties and frequency dispersion of complex permeability of Ni-Zn-Co ferrites used for magnetic shielding in near field communication (NFC) system. The sintered specimens of (Ni0.7Zn0.3)1-xCoxFe2O4 composition were prepared by the conventional ceramic processing. The coercive force and saturation magnetization were measured by vibrating sample magnetometer. The complex permeability was measured by RF impedance analyzer in the range of 1 MHz~1.8 GHz. The coercive force increased and saturation magnetization decreased with increasing the Co substitution. The real and imaginary parts of complex permeability decreased and the resonance frequency increased with Co substitution, which was attributed to the increase in crystal anisotropy field and reduction in saturation magnetization. The effect of Co substitution could be found in reducing the magnetic loss to nearly zero at the operating frequency of NFC (13.56 MHz).

These days it still writes on maintenance list by paper regarding safety inspection of bridge structures or saves data to be computerized. However this system occurs many problems regarding less data reliability, inefficiency system and subjective evaluation in bridge structures. This paper suggests smart bridge maintenance using NFC which is objective and high precision and tries to study that any body who takes a simple training can use this system simplified.

국내 교량 구조물에 대한 안전점검은 현재 까지도 수작업을 토대로 관리대장에 직접 기록하여 paper형태로 보관 하거나 관리대장을 컴퓨터로 전산화시켜 보관하는 과정에서 벗어나지 못하고 있다. 이러한 과정은 자료의 신뢰성 저하, 비효율적 관리자료, 주관적인 평가로 인하여 교량 구조물에 대한 잠재적인 문제점이 발생하고 있다. 이러한 논제를 해결하고자 본 논문에서는 효율성, 경제성, 신뢰성, 편의성을 충족시킬 수 있는 방법으로 첨단 IT기술인 NFC를 이용한 교량의 지능형 유지관리 시스템을 제안하였다. 객관적이며 정밀도를 향상 시킬 수 있고, 시스템의 단순화로 기존의 전문화된 인력만 사용할 수 있었던 개념을 탈피하여 누구나 간단한 교육만으로도 쉽게 사용할 수 있는 시스템으로 연구하였다.