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김종혁,김일해,박만진,장동영,한동철,백영종 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
General purpose of cylindrical capacitive displacement sensor(CCS) is measuring run-out motion and deflection of rotor. If CCS has narrow sensing range, its sensitivity coefficients must be calibrated precisely. And x, y component of CCS output can be coupled. In this research, CCS calibration procedure is automated with automatic calibration program and PC-controlled stage. And, coupled-terms of CCS signals were removed and the errors between measured position and mapped CCS signal were reduced obviously by sensitivity matrix that linearly
A Simple Cellphone Detector : How to Find a Needle in a Hay Stack
김종혁,노희상,김인석 경희대학교 공학연구소 2008 레이저공학 Vol.19 No.-
In this paper, a detector system technique sensing the "on" state of a cellphone is presented. The detector does not sense communication signals, but senses RF power at LO (Local Oscillator) frequencies of various cellphones, such as 954 ~ 979 MHz and 1.06~ 1.1 GHz for cellular service, and 1.62 ~ 1.665 GHz and 2.04 ~ 2.145 GHz for PCS (Personal Communication System) service in Korea. First, system environment such as frequency allocations for cellphone service is studied and power levels at the LO frequencies are investigated. And then the system consisting of antenna, band pass filters, and amplifier chains for the above frequency bands is developed and measured. At the output of the amplifier stage, the attenuation stage has been placed to control for higher signal level, and the received signal is converted to a DC voltage by ADC (Analog Digital Converter). The voltage level is displayed with 10 LEDs and indicates the level of the LO power received, depending on how many LEDs are lightened. The detector can sense a cellphone secretly operating in a prohibited area, a cellphone secretly entering into a prohibited area, or a person with a cellphone buried by accident.