5,160 research outputs found
A Complementary Resistive Switch-based Crossbar Array Adder
Redox-based resistive switching devices (ReRAM) are an emerging class of
non-volatile storage elements suited for nanoscale memory applications. In
terms of logic operations, ReRAM devices were suggested to be used as
programmable interconnects, large-scale look-up tables or for sequential logic
operations. However, without additional selector devices these approaches are
not suited for use in large scale nanocrossbar memory arrays, which is the
preferred architecture for ReRAM devices due to the minimum area consumption.
To overcome this issue for the sequential logic approach, we recently
introduced a novel concept, which is suited for passive crossbar arrays using
complementary resistive switches (CRSs). CRS cells offer two high resistive
storage states, and thus, parasitic sneak currents are efficiently avoided.
However, until now the CRS-based logic-in-memory approach was only shown to be
able to perform basic Boolean logic operations using a single CRS cell. In this
paper, we introduce two multi-bit adder schemes using the CRS-based
logic-in-memory approach. We proof the concepts by means of SPICE simulations
using a dynamical memristive device model of a ReRAM cell. Finally, we show the
advantages of our novel adder concept in terms of step count and number of
devices in comparison to a recently published adder approach, which applies the
conventional ReRAM-based sequential logic concept introduced by Borghetti et
al.Comment: 12 pages, accepted for IEEE Journal on Emerging and Selected Topics
in Circuits and Systems (JETCAS), issue on Computing in Emerging Technologie
Novel dual-mode balun bandpass filters using single cross-slotted patch resonator
In this letter, a novel dual-mode bandpass balun filter is presented using a miniaturized cross-slotted patch resonator. This balun filter consists of a single slit-loaded patch etched by a pair of cross slots and a stepped-impedance open stub. An unbalanced input port is orthogonally arranged in-between two balanced output ports along the patch, and each feed line is connected to an additional stub for enhanced coupling. Due to the dual-mode characteristic of the patch resonator, two transmission poles can be easily constructed at both balanced passbands. Asymmetrical width and length of the cross-loaded slots perturb the field of the patch and excite two degenerate modes simultaneously, while the attached open-circuited stub provides an additional degree of freedom for performance tuning. Finally, two prototype balun filters are designed and fabricated at 3.48 and 1.80 GHz, respectively. Measured results achieve good filtering and balun performance and agree well with those from simulations. © 2011 IEEE.published_or_final_versio
Research accomplished at the Knowledge Based Systems Lab: IDEF3, version 1.0
An overview is presented of the foundations and content of the evolving IDEF3 process flow and object state description capture method. This method is currently in beta test. Ongoing efforts in the formulation of formal semantics models for descriptions captured in the outlined form and in the actual application of this method can be expected to cause an evolution in the method language. A language is described for the representation of process and object state centered system description. IDEF3 is a scenario driven process flow modeling methodology created specifically for these types of descriptive activities
Structural disorder versus chiral magnetism in CrNbS
The crystal structure of a disordered form of CrNbS has been
characterized using diffraction and inelastic scattering of synchrotron
radiation. In contrast to the previously reported symmetry (P622), the
crystal can be described by a regular twinning of an average P6 structure
with three disordered positions of the Cr ions. Short-range correlations of the
occupational disorder result in a quite intense and structured diffuse
scattering; a static nature of the disorder was unambiguously attributed by the
inelastic x-ray scattering. The diffuse scattering has been modeled using a
reverse Monte-Carlo algorithm assuming a disorder of the Cr sub-lattice only.
The observed correlated disorder of the Cr sub-lattice reduces the temperature
of the magnetic ordering from 130 K to 88 K and drastically modifies the field
dependence of the magnetization as it is evidenced by the SQUID magnetometery.
We conclude, that in contrast to the helicoidal spin structure assumed for
P622 form, the compound under study is ferromagnetically ordered with a
pronounced in-plane anisotropy
ANALYSIS OF BILATERAL ASYMMETRIES BY FLIGHT TIME OF ONE LEG COUNTERMOVEMENT JUMP
Lateral differences concerning the magnitude of strength are frequently found in the lower limbs (LL) and may be related to preference (dominant and non-dominant) and skill performance. For jump tests the lateral differences greater than 15% are considered clinically significant (Noyes et al., 1991). Since Countermovement Jumps (CMJ) on a force platform are an adequate method for the identification of lateral asymmetries (Menzel et al., 2006), the objective was to verify if lateral asymmetries of CMJ performance can also be identified by the flight time of single leg CMJ on a contact mat
Hidden quantum phase transition in MnFeGe: evidence brought by small-angle neutron scattering
The magnetic system of the MnFeGe solid solution is ordered in
a spiral spin structure in the whole concentration range of .
The close inspection of the small-angle neutron scattering data reveals the
quantum phase transition from the long-range ordered (LRO) to short range
ordered (SRO) helical structure upon increase of Fe-concentration at . The SRO of the helical structure is identified as a
Lorentzian contribution, while LRO is associated with the Gaussian contribution
into the scattering profile function. The scenario of the quantum phase
transition with as a driving parameter is similar to the thermal phase
transition in pure MnGe. The quantum nature of the SRO is proved by the
temperature independent correlation length of the helical structure at low and
intermediate temperature ranges with remarkable decrease above certain
temperature . We suggest the -dependent modification of the effective
Ruderman-Kittel-Kasuya-Yosida exchange interaction within the Heisenberg model
of magnetism to explain the quantum critical regime in MnFeGe.Comment: 6 pages, 4 figure
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