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NFC와 UHF 통신의 결합설계 방법에 의한 원격제어 잠금시스템의 구현
박승환(Seung-Hwan Park),김창복(Chang-Bok Kim),박형모(Hyung-Mo Park),김영서(Yung-Ser Kim) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.12
In this paper, we proposed an RFID control system to handle remotely the digital locking units installed in the various furniture and storage facilities of the office environments. The system of this research is a combinational mobile RFID system with UHF AP(Access Point)controller, which is devised to enable the lock units in the office to control remotely by combining two ways of the NFC capability of HF band(13.56MHz) and the RF communication technology of UHF band(447MHz). This system consists of four main parts : the NFC smartphone with the remote control application, the management server to monitor the locks state and operation, the UHF AP controller to handle all lock units and the lock-unit terminals, and it is designed to keep the highly accurate document security. In results, by implementing a system using the network constitution with the UHF AP controller, we confirmed that it is possible for this system to operate with the power-down function by wireless wake-up mode, the synchronous and multiple control of terminals, the communication distance above 20m, low cost terminals for the existing direct approach methods based on Zigbee, Bluetooth, CDMA and WiFi.
적외선 센서를 이용한 저 전력 RFID 시스템 설계 및 구현
박승환(Seung-Hwan Park),박형모(Hyeong-Mo Park),김창복(Chang-Bok Kim) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.7
This paper proposes an efficient power control RFID system, which has control by separating both entire power of RFID system and power control device of RF communication. PCRS shut off power when not used, which can remove unnecessary power consumption of sleep mode and RF-communication module. When PCRS detects users around through infrared ray sensors, it allows power on and is on standby periodically going on-and-off to reduce the power consumption of RF-communication module. If user tag provides user information, it decreases power consumption by blocking the entire power supply when not used for a while and the user information process completed by MCU. Given the operating ratio 0.3, existing RFID system has 20.1㎃ at system operation current, 20.3㎂ at sleep mode current and 20.12㎃ at standby current. However, the same condition given, PCRS has 5.4㎃ at standby current. In conclusion, PCRS can decrease power consumption at standby current as many as 4 timescompared to existing PCRS system.
스마트 워터그리드 네트워크의 원격 단말기 보안을 위한 암호화 모듈에 관한 연구
박승환 ( Seung Hwan Park ),박형모 ( Hyung Mo Park ),김창복 ( Chang Bok Kim ) 한국항행학회 2013 韓國航行學會論文誌 Vol.17 No.6
본 논문은 스마트 워터그리드의 원격단말기와 상위 서버단간의 검침 및 제어 데이터의 안정적 전송을 위한 보안모듈에 대해 연구하였다. 제안한 보안모듈은 기존에 보급되어 사용 중인 보안성 없는 원격 단말기에 부착할 수 있도록 구현되었다. 특히, 전기 분야의 스마트그리드와는 달리 스마트 워터그리드는 배터리 전원을 사용하므로 저 전력을 고려하였으며, 지하에 설치되는 계량기 위치에 의한 습하고 열악한 환경이 대단위 네트워크시스템 구축 시 통신 장애 발생시키는 점을 고려하여 ARIA-GCM-128 대칭키 방식을 채택하였다. 본 논문의 암호화 모듈은 단말기의 검침 데이터와 상위 서버단의 제어 데이터에 대한 보안을 확보하고 임의로 위변조 되는 것을 방지하여 원격검침 시스템에 대한 안정성을 확보할 수 있도록 구현되었다. This paper studies the security module for the reliable transmission of the meter reading and the control data between the remote terminals and the upper server-side in smart water grid. The proposed security module was implemented to make it attachable to the remote terminal without security function. In particular, unlike the smart grid of electric field, the low power is considered due to the use of battery power in the smart water grid, and the ARIA-GCM-128 symmetric key method is adopted taking into the account that the damp and constrictive environments by the installed meter location in the underground occur a communication obstacle on building of the large-scale network system. The encryption module of this paper was devised to ensure the safety between the reading data on the terminal and the control data from the upper server, and secure the stability of the remote meter reading system by taking protection against an arbitrary alteration or modification.
직접 스마트 칩 내장 방식을 이용한 NFC 스마트폰 기반의 잠금 시스템 구현
박승환(Seung-Hwan Park),박형모(Hyeong-Mo Park),김영서(Yung-Ser Kim) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.12
This paper concerns research on NFC Smartphone-based lock system that may be used to minimize the operating current by using the directly smart chip mounted method in the field of the office environments. This system of this research was designed to perform an associated action method that the current induced by the Smartphone reader simultaneously activates the smart chip and the wake-up circuit part to initiates the power supply to the motor driving control part. This system is executed by the lock device with the smart chip through the UI application. In results, by showing that it operates with standby current less than 1㎂, we confirmed that it is possible for this system to reduce the operating current and increase the current dissipation efficiency. And also, the replacement effect for the existing mechanical key is expected to enlarge the user convenience with the UI application program for the registry and management of the multiple user.