Carlos Salazar-Lazaro
California Institute of Technology
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Featured researches published by Carlos Salazar-Lazaro.
Proceedings of the First NASA/DoD Workshop on Evolvable Hardware | 1999
Adrian Stoica; Didier Keymeulen; Raoul Tawel; Carlos Salazar-Lazaro; Wei-te Li
The paper describes the architectural details of a fine-grained programmable transistor array (PTA) architecture and illustrates its use in evolutionary experiments on the synthesis of both analog and digital circuits. A PTA chip was built in CMOS to allow circuits obtained through evolutionary design using a simulated PTA to be immediately deployed and validated in hardware and, moreover, enables a benchmarking and comparison of evolutions carried out via simulations only (extrinsic evolution) with the chip-in-the-loop (intrinsic) evolutions. The evolution of an analog computational circuit and a logical inverter are presented. Synthesis by software evolution found several potential solutions satisfying the a priori constraints, however, only a fraction of these proved valid when ported to the hardware. The circuits evolved directly in hardware proved stable when ported to different chips. In either case, both software and hardware experiments indicate that evolution can be accelerated when gray-scale (as opposed to binary switches) were used to define circuit connectivity. Overall, only evolution directly in hardware appears to guarantee a valid solution.
international conference on evolvable systems | 1998
Adrian Stoica; Alex Fukunaga; Kenneth J. Hayworth; Carlos Salazar-Lazaro
This paper focuses on characteristics and applications of evolvable hardware (EHW) to space systems. The motivation for looking at EHW originates in the need for more autonomous adaptive space systems. The idea of evolvable hardware becomes attractive for long missions when the hardware looses optimality, and uploading new software only partly alleviates the problem if the computing hardware becomes obsolete or the sensing hardware faces needs outside original design specifications. The paper reports the first intrinsic evolution on an analog ASIC (a custom analog neural chip), suggests evolution of dynamical systems in state-space representations, and demonstrates evolution of compression algorithms with results better than the best-known compression algorithms.
congress on evolutionary computation | 1999
Adrian Stoica; Gerhard Klimeck; Carlos Salazar-Lazaro; Didier Keymeulen; A. Thakoor
The paper addresses the use of evolutionary algorithms in the design of electronic devices and circuits. In particular, the paper introduces the idea of evolutionary design of nanodevices, and illustrates it with the design of a resonant tunneling diode. A second experiment, this time using CMOS microdevices, illustrates the use of evolutionary algorithms for circuit design. The experiments were facilitated by an evolutionary design tool developed around a parallel implementation of genetic algorithms (using PGAPack), and device/circuit simulators (NEMO and SPICE). It is speculated that in the future, devices and circuits may be simultaneously co-designed.
Proceedings of the First NASA/DoD Workshop on Evolvable Hardware | 1999
Gerhard Klimeck; Carlos Salazar-Lazaro; Adrian Stoica; Thomas A. Cwik
The quantum mechanical functionality of nanoelectronic devices such as resonant tunneling diodes (RTDs), quantum well infrared photodetectors (QWIPs), quantum well lasers, and heterostructure field effect transistors (HFETs) is enabled by material variations on an atomic scale. The design and optimization of such devices requires a fundamental understanding of electron transport in such dimensions. The nanoelectronic modeling tool (NEMO) is a general-purpose quantum device design and analysis tool based on a fundamental non-equilibrium electron transport theory. NEMO was combined with a parallelized genetic algorithm package (PGAPACK) to evolve structural and material parameters to match a desired set of experimental data. A numerical experiment that evolves structural variations such as layer widths and doping concentrations is performed to analyze an experimental current voltage characteristic. The genetic algorithm is found to drive the NEMO simulation parameters close to the experimentally prescribed layer thicknesses and doping profiles. With such a quantitative agreement between theory and experiment design synthesis can be performed.
Superlattices and Microstructures | 2000
Gerhard Klimeck; R.C. Bowen; Timothy B. Boykin; Carlos Salazar-Lazaro; Tom Cwik; Adrian Stoica
Archive | 2000
Adrian Stoica; Carlos Salazar-Lazaro
genetic and evolutionary computation conference | 2000
Didier Keymeulen; Gerhard Klimeck; Ricardo Salem Zebulum; Adrian Stoica; Carlos Salazar-Lazaro
MRS Proceedings | 1998
Gerhard Klimeck; Carlos Salazar-Lazaro; Adrian Stoica; Thomas A. Cwik
Archive | 1999
Adrian Stoica; Carlos Salazar-Lazaro
Archive | 1998
Gerhard Klimeck; C. Bowen; Timothy B. Boykin; Fabiano Oyafuso; Carlos Salazar-Lazaro; Adrian Stoica; Tom Cwik