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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.
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Until in Singapore English is Not So Non-standard
김종혁,김창수 신영어영문학회 2024 신영어영문학 Vol.88 No.-
Many lexical items in Singapore English display characteristics similar to those found in Chinese, reflecting the profound influence of various Chinese dialects on this variant of English. Bao and Wee (1998) argue that the lexical item until in Singapore English is illustrative of such influence. According to them, Singapore English allows until to convey both consecutive and concurrent readings, while Standard English is said to allow only consecutive readings. They attribute the flexibility of until in Singapore English to the influence of the Chinese word dao. In this article, we challenge Bao and Wee’s claim by demonstrating that Standard English until indeed accommodates both consecutive and concurrent readings. This perspective is supported by existing literature that describes the inferences generated by until as implicatures − pragmatic meanings that are context-dependent and cancellable. Our analysis indicates, if correct, that the semantic properties of until in Singapore English are not significantly different from those in Standard English, contrary to what has been previously suggested.
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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
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TE<sub>01</sub><sub>δ</sub> 모드 유전체 공진기와 코플래나 웨이브가이드 구조들과의 결합 특성 연구
김종혁,김인석,Kim, Jong-Hyuk,Kim, Ihn S. 한국항행학회 2005 한국항행학회논문지 Vol.9 No.2
In this paper, we propose that three uniform coplanar waveguides(CPWs), such as a conventional, finite grounded(FG), and grounded(G) CPWs, can be coupled with a $TE_{01{\delta}}$ mode dielectric resonator(DR) for a parallel resonant characteristic as a microstrip line coupled with the DR. Coupling characteristics have been investigated by placing the DR on a dielectric support above the CPWs and by moving the DR away from the center of a slot of the CPWs to the ground plane. FEM simulation(HFSS) results in terms of S-parameters agree well with measurement results. Finally, unloaded Q values of the DR coupled with the three uniform CPWs are compared with those of the DR coupled with a microstrip line. The comparison shows that the DR coupled with the three CPWs has higher unloaded Qs than that coupled with a microstrip line and that the GCPW case has the highest unloaded Qs.
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