1,630 research outputs found
High speed hardware development for FDMA/TDM system
The development of a transmultiplexor and a quadrature phase shift keying (QPSK) demodulator is discussed. The system is designed to meet real time signal processing requirements of future satellite systems and should consume very little power. The architectures of the transmultiplexor and the demodulator are designed for the pipelining of all the modules, namely the commutator, the filter bank fast fourier transform (FFT), and the internal modules of the QPSK. The architecture is designed for the case of 800 channels. Each channel is to have a bandwidth of 45 KHz and a bit rate of 64 Kb/s. In this case each module will have 22.22 micro seconds to complete a computation
A reconfigurable multicarrier demodulator architecture
An architecture based on parallel and pipline design approaches has been developed for the Frequency Division Multiple Access/Time Domain Multiplexed (FDMA/TDM) conversion system. The architecture has two main modules namely the transmultiplexer and the demodulator. The transmultiplexer has two pipelined modules. These are the shared multiplexed polyphase filter and the Fast Fourier Transform (FFT). The demodulator consists of carrier, clock, and data recovery modules which are interactive. Progress on the design of the MultiCarrier Demodulator (MCD) using commercially available chips and Application Specific Integrated Circuits (ASIC) and simulation studies using Viewlogic software will be presented at the conference
Simultaneous Inference of User Representations and Trust
Inferring trust relations between social media users is critical for a number
of applications wherein users seek credible information. The fact that
available trust relations are scarce and skewed makes trust prediction a
challenging task. To the best of our knowledge, this is the first work on
exploring representation learning for trust prediction. We propose an approach
that uses only a small amount of binary user-user trust relations to
simultaneously learn user embeddings and a model to predict trust between user
pairs. We empirically demonstrate that for trust prediction, our approach
outperforms classifier-based approaches which use state-of-the-art
representation learning methods like DeepWalk and LINE as features. We also
conduct experiments which use embeddings pre-trained with DeepWalk and LINE
each as an input to our model, resulting in further performance improvement.
Experiments with a dataset of 356K user pairs show that the proposed
method can obtain an high F-score of 92.65%.Comment: To appear in the proceedings of ASONAM'17. Please cite that versio
Spin waves interference from rising and falling edges of electrical pulses
The authors have investigated the effect of the electrical pulse width of
input excitations on the generated spin waves in a NiFe strip using pulse
inductive time domain measurements. The authors have shown that the spin waves
resulting from the rising- and the falling-edges of input excitation pulses
interfere either constructively or destructively, and have provided conditions
for obtaining spin wave packets with maximum intensity at different bias
conditions
Superconductor Insulator Transition in Long MoGe Nanowires
Properties of one-dimensional superconducting wires depend on physical
processes with different characteristic lengths. To identify the process
dominant in the critical regime we have studied trans- port properties of very
narrow (9-20 nm) MoGe wires fabricated by advanced electron-beam lithography in
wide range of lengths, 1-25 microns. We observed that the wires undergo a
superconductor -insulator transition that is controlled by cross sectional area
of a wire and possibly also by the thickness-to-width ratio. Mean-field
critical temperature decreases exponentially with the inverse of the wire cross
section. We observed that qualitatively similar superconductor{insulator
transition can be induced by external magnetic field. Some of our long
superconducting MoGe nanowires can be identified as localized superconductors,
namely in these wires one-electron localization length is much shorter than the
length of a wire
Unveiling Theory of Mind in Large Language Models: A Parallel to Single Neurons in the Human Brain
With their recent development, large language models (LLMs) have been found
to exhibit a certain level of Theory of Mind (ToM), a complex cognitive
capacity that is related to our conscious mind and that allows us to infer
another's beliefs and perspective. While human ToM capabilities are believed to
derive from the neural activity of a broadly interconnected brain network,
including that of dorsal medial prefrontal cortex (dmPFC) neurons, the precise
processes underlying LLM's capacity for ToM or their similarities with that of
humans remains largely unknown. In this study, we drew inspiration from the
dmPFC neurons subserving human ToM and employed a similar methodology to
examine whether LLMs exhibit comparable characteristics. Surprisingly, our
analysis revealed a striking resemblance between the two, as hidden embeddings
(artificial neurons) within LLMs started to exhibit significant responsiveness
to either true- or false-belief trials, suggesting their ability to represent
another's perspective. These artificial embedding responses were closely
correlated with the LLMs' performance during the ToM tasks, a property that was
dependent on the size of the models. Further, the other's beliefs could be
accurately decoded using the entire embeddings, indicating the presence of the
embeddings' ToM capability at the population level. Together, our findings
revealed an emergent property of LLMs' embeddings that modified their
activities in response to ToM features, offering initial evidence of a parallel
between the artificial model and neurons in the human brain
Controlled Tactile Exploration and Haptic Object Recognition
In this paper we propose a novel method for in-hand object recognition. The method is composed of a grasp stabilization controller and two exploratory behaviours to capture the shape and the softness of an object. Grasp stabilization plays an important role in recognizing objects. First, it prevents the object from slipping and facilitates the exploration of the object. Second, reaching a stable and repeatable position adds robustness to the learning algorithm and increases invariance with respect to the way in which the robot grasps the object. The stable poses are estimated using a Gaussian mixture model (GMM). We present experimental results showing that using our method the classifier can successfully distinguish 30 objects.We also compare our method with a benchmark experiment, in which the grasp stabilization is disabled. We show, with statistical significance, that our method outperforms the benchmark method
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