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차균현,사공석진,최한규 고려대학교 공학기술연구소 1984 고려대학교 생산기술연구소 생기연논문집 Vol.19 No.1
A VCO (Voltage Controlled Oscillator) in the spectrum analyzer is to sweep frequency in order to scan spectra of input signal. The stability and accuracy of the spectrum analyzer depend on the frequency stability and accuracy of its VCO. Both stability and accuracy can be improved by phase locking. It was implemented using the method of modulo PLL with fast acquisition time and many channel to design the VCO which can be applied to spectrum analyzer. The system is simpler than previous modulo PLL because it shows the same result with variable N/2 and constant K.
실리콘 직접 접합 / 전기화학적 식각정지를 이용한 실리콘 다이아프램의 형성과 실리콘 압력센서 제조에의 응용
주병권,하병주,김근섭,송만호,김성환,김철주,차균현,오명환 ( B . K . Ju,B . J . Ha,K . S . Kim,M . H . Song,S . H . Kim,C . J . Kim,K . H . Tchah,M . H . Oh ) 한국센서학회 1994 센서학회지 Vol.3 No.3
A new type of Si diaphragm was fabricated using Si-wafer direct bonding and two-step electrochemical etch-stopping methods. Using the new diaphragm structure in mechanical sensors, more precise control of cavity depth and diaphragm thickness was achievable. Also, the propagation of the stress, which was generated near the bonding interface, to the surface can be avoided. Finally, a piezoresistive-type Si pressure sensor was fabricated utilizing the diaphragm and a digital pressure gauge, which can display units of pressure, was realized.
노영섭,허경,엄두섭,이연우,K. H. Tchah 한국통신학회 2005 Journal of communications and networks Vol.7 No.3
The smooth handoff supported by the route optimization extension to the mobile IP standard protocol should support a packet buffering mechanism at the base station (BS), in order to reduce the degradation in TCP performance caused by packet losses within mobile network environments. The purpose of packet buffering at the BS is to recover the packets dropped during inter-subnetwork handoff by forwarding the packets buffered at the previous BS to the new BS. However, when the mobile host moves to a congested BS within a new foreign subnetwork, the buffered packets forwarded by the previous BS are likely to be dropped. This subsequently causes global synchronization to occur, resulting in the degradation of the wireless link in the congested BS, due to the increased congestion caused by the forwarded burst packets. Thus, in this paper, we propose an implicit priority forwarding (IPF) packet buffering scheme as a solution to this problem within mobile IP based networks. In the proposed IPF method, the previous BS implicitly marks the priority packets being used for inter-subnetwork handoff. Moreover, the proposed modified random early detection (M-RED) buffer at the new congested BS guarantees some degree of reliability to the priority packets. The simulation results show that the proposed IPF packet buffering scheme increases the wireless link utilization and, thus, it enhances the TCP throughput performance in the context of various inter-subnetwork handoff cases.