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- 저자 : 김영서(Yung-Ser Kim) (검색결과 4 건)
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병원환경에서 ISM 대역의 텔레메트리 의료기기의 전파간섭 발생에 관한 연구
김영서(Yung-Ser Kim),박승환(Seung-Hwan Park) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.12
Recently, the rapidly increased use of the wireless devices in the same ISM bands causes a malfunction of the medical instruments as the patient monitoring system. This study was undertaken to identify that the radio interference influences on the medical telemetry equipments. Firstly, the current usage situation of the radio frequency with ISM band is analyzed for the telemetry medical system, and then the experimental method is proposed that installs the telemetry system between the Wi-Fi AP and the integrated Wi-Fi AP to effectively detect the influence of interference. In results, it is confirmed that the malfunction phenomenon due to the signal loss by dropouts occurs in the telemetry monitoring system. It is expected that this research can be reflected on the basis material for establishing the nations policy about the requirement of the exclusive frequency band of hospital medical instruments.
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피부 표면의 습도상태 측정을 위한 다채널 모니터링 시스템의 구현
박승환(Seung-Hwan Park),김영서(Yung-Ser Kim) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.12
In this paper, we proposed a monitoring system to measure the humidity-state of skin surface which is significant discrimination condition in the field of cosmetics and medicine. The system of this research make use of the multichannel measurement method that consists of 4 sensor for skin humidity and 1 sensor for surrounding humidity, which is devised to enable to monitor the variation in the detected humidity-distribution state on skin surface. This system consists of three main parts : the sensor probe, the measurement control part capable to processing the detected measurement data and transmitting it to PC, the monitoring software to display and analyze the acquisited data on the screen. In results, we confirmed that, compared with method of detecting the skin humidity from the only one specified area, this system has the advantages of the synchronous information detection on the extended humidity-distribution state on skin surface, the display by the calibration of reference humidity/temperature and so on.
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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.
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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.
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