Please login to be able to save your searches and receive alerts for new content matching your search criteria.
In this paper, for the first time a design for a Reversible Programmable Logic Array (RPLA) is introduced. This is the first RPLA design because the reversible PLA design, presented in previous research, is not a programmable circuit. In our presented RPLAs, four reversible AND array designs with different specifications are proposed. A reversible OR array, which can be programmed to generate any Boolean function, is also designed. This reversible and programmable OR array is also cascadable. That is, it produces a copy of inputted midterms at its outputs to be fed to another OR array in order to design another Boolean function, with no need for another AND array. The proposed 3-input RPLA is programmed to design three reversible circuits, a 1-bit full adder, a 1-bit full subtractor, and a 2-to-1 line multiplexer. Five figures of merit, including number of gates, number of constant inputs, number of garbage outputs, depth and quantum cost of the circuit are considered to evaluate and compare the designs. A comparison between the proposed reversible AND arrays and the same circuit presented in previous research, against these figures of merit, shows a better performance of our proposed designs. The proposed RPLAs are also evaluated, using these five figures of merit.
Miniaturization and the continued scaling of CMOS technology leads to the high-power dissipation and ever-increasing power densities. One of the major challenges for the designer at all design levels is the temperature management, particularly the local hot spots along with power dissipation. In this work, the controller circuits which are implemented as Finite State Machines (FSMs) are considered for their thermal-aware and power-aware realization. Using Genetic Algorithm (GA), both encoding and bipartitioning of the FSM circuit are implemented to get two subFSMs such that at a particular instant of time, one subFSM is active at a time, whereas the other one is power-gated. Again, thermal-aware realization (in terms of power-density) of this power-gated FSM is done. Therefore, the work concerns with the thermal-aware encoding and partitioning of FSM for its power-gated realization. Average temperature saving obtained in this approach for a set of benchmark circuits over previous works is more than 16%. After getting the final partitioned circuit which is optimized in terms of Area and power-density, thermal analysis of the sunFSMs is performed to get the absolute temperature. As thermal-aware design may increase the area, a suitable area-temperature trade-off is also presented in this paper.
Single and coaxial electrospraying techniques are superior nanofabrication methods for nanomaterial production. These nanomaterials have the unique capability to manipulate various surfaces and bring diverse additional functionalities. The objectives of the present study are to produce poly(lactic acid) (PLA)/chitosan nanoparticles and investigate the synergy of nanosize effect with different morphology structures in terms of achieved functionality. The impact of ambient humidity on coating morphology was examined via a scanning electron microscope, field emission scanning electron microscope and dynamic light scattering for size measurements and dimensional characterization of nanoparticles. The obtained results indicate that electrosprayed PLA polymer shows a tendency to have a more distinct pore structure than electrosprayed chitosan polymer. Humidity has an increasing effect on particle size. Another finding is the relationship between hygroscopic characteristics of polymer with nanoparticle size, polydispersity, surface morphology and pore structure. Overall, these methods introduced high antibacterial activity obtainment on electrosprayed surfaces. Up to 99.99% antibacterial activity was accomplished against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria in regard to this study. The created surface layers also have the extensive potential of practicability for diversified kinds of surfaces and numerous combinations of polymers for multifunctional applications.