Recently, VLSI technology has considered chip area, operation speed and power consumption. The traditional CMOS logic circuits dissipate the power only when the load is charging and discharging. Therefore, the power consumption of the CMOS logic circuits is generally small at low frequency. However, by the increasing frequency reaching to 1 GHz, the power consumption
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Multi-valued logic circuits have srong signal carrying capacity of single lines, which offer a valid solution for the problems brought by processing speed and the increasing area occupied by interactions in ICs. Meanwhile, the adiabatic circuits with energy recovery characteristics can reduce the power consumption greatly. By researching the working principle and characteristics of multi-valued
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In this century, the most realistic and pressing development direction of microelectronics is the changes from integrated circuit (IC) to the integrated system (IS).The problem of chip area increasing, connecting complexity increasing, the areas and delay of interconnection wires augmenting, and parasitic effects arose by interconnection wires will be created with chip performance improving. The
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Due to the rapid development of computer science and its extensively application in modern society, some scholars found a new type of dynamic systems named as discrete event systems (DES), which is different from continuous variable dynamic systems. The dominating characteristic of DES is that its evolution is not driven by times but events. Essentially,
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As important data stored center of information systems, database has always been attack target. Traditional prevention and protection centric database security mechnisms, such as cryptography, identification, access control, firewall and multi-level security mechinisms, put emphases on inspection of user identification and permission constraints, and can not prevent all attacks and abuses of inner normal users.
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