Browsing by Author "Tsai, MK"

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Design techniques for VHF/UHF high-Q tunable bandpass filters using simple CMOS inverter-based transresistance amplifiers
(1996-05-01)
Lu, PH
;
Wu, CY
;
Tsai, MK
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, CMOS inverter-based wideband transresistance R(m) amplifiers are proposed and analyzed. Using the R(m) amplifiers, tunable VHF/UHF R(m)-C bandpass biquadratic filters can be designed. In these filters, the center frequency f(o) can be post-tuned by adjusting the control voltages of the R(m) amplifiers. The pseudodifferential configuration uses the extra inversely connected and self-shorted inverters for Q enhancement. Experimental results have shown that the center frequency f(o) of the single-ended-output R(m)-C bandpass biquad is 386 MHz (258 MHz) and Q = 1.195 (Q = 1.012) for +/-2.5 V (+/-1.5 V) supply voltage. The power consumption is 24.83 mW (3.42 mW), and the dynamic range is 61 dB (55.5 dB). For pseudodifferential-output high-Q configuration, the measured quality factor Q can be as high as 360 with f, = 222.7 MHz. When Q = 94, the power consumption is 56.2 mW and the measured dynamic range is 57.8 dB for +/-2.5 V supply voltage.
Protocol based foresight anomaly intrusion detection system
(2003)
Tsai, MK
;
Lin, SC
;
Tseng, SS
;
資訊工程學系
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Department of Computer Science
In recent years, a lot of network intrusion detection systems (NIDSs) have been developed to assist administrators in detecting the malevolent attacks. However, most of the NIDSs may not prevent attacks in advance. In order to prevent attacks, a Finite Automata Based Foresight Network Intrusion Detection System (FA-FNIDS) will be proposed in this paper. The FA-FNIDS can prevent attacks and further find novel attacks. Finally, three experiments will also be done for evaluating the efficiency of our FA-FNIDS.