48 research outputs found
LEADERSHIP TRAINING IN MICHIGAN
Teaching/Communication/Extension/Profession,
THE MICHIGAN STUDY-DISCUSSION PROGRAM, "DEVELOPING HUMAN RESOURCES IN MICHIGAN"
Labor and Human Capital,
FOREIGN AGRICULTURAL POLICY AND FAR EAST FARM MARKETS
Agricultural and Food Policy,
Demonstrating Advantages of Neuromorphic Computation: A Pilot Study
Neuromorphic devices represent an attempt to mimic aspects of the brain's
architecture and dynamics with the aim of replicating its hallmark functional
capabilities in terms of computational power, robust learning and energy
efficiency. We employ a single-chip prototype of the BrainScaleS 2 neuromorphic
system to implement a proof-of-concept demonstration of reward-modulated
spike-timing-dependent plasticity in a spiking network that learns to play the
Pong video game by smooth pursuit. This system combines an electronic
mixed-signal substrate for emulating neuron and synapse dynamics with an
embedded digital processor for on-chip learning, which in this work also serves
to simulate the virtual environment and learning agent. The analog emulation of
neuronal membrane dynamics enables a 1000-fold acceleration with respect to
biological real-time, with the entire chip operating on a power budget of 57mW.
Compared to an equivalent simulation using state-of-the-art software, the
on-chip emulation is at least one order of magnitude faster and three orders of
magnitude more energy-efficient. We demonstrate how on-chip learning can
mitigate the effects of fixed-pattern noise, which is unavoidable in analog
substrates, while making use of temporal variability for action exploration.
Learning compensates imperfections of the physical substrate, as manifested in
neuronal parameter variability, by adapting synaptic weights to match
respective excitability of individual neurons.Comment: Added measurements with noise in NEST simulation, add notice about
journal publication. Frontiers in Neuromorphic Engineering (2019
Percepção de Jovens Brasileiros sobre as Repercussões das Redes Sociais na Subjetividade
This study has the objective of analyzing the perception of young Brazilians about the possible repercussions of social networks on users' subjectivity. A total of 50 young adults of both genders, ranging from ages 18 to 26, the majority undergraduate students, all residents in the Federal District participated in the study. Based on the qualitative methodology, semi-structured interviews were performed and the data was analyzed through the Zones of Sense (Zonas de Sentido) technique. The results evidence that social networks have a determined influence in the user's conception of the world and self through interesting resources that generate rewards, catch the attention and promote the constant use of these networks.O presente estudo teve como objetivo analisar a percepção de jovens brasileiros acerca de possÃveis repercussões das redes sociais na subjetividade dos usuários. Participaram da pesquisa 50 jovens, de ambos os sexos, faixa etária de 18 a 26 anos de idade, em sua maioria com escolaridade de nÃvel superior incompleto e todos residentes no Distrito Federal. Com base na metodologia qualitativa, foram realizadas entrevistas semiestruturadas e os dados obtidos foram analisados por meio da técnica da Zona de Sentidos. Os resultados evidenciam que as redes sociais exercem influência determinante na concepção de mundo e de si mesmo dos participantes por meio de recursos atrativos que geram gratificações, capturam a atenção e promovem a utilização constante das redes
Versatile emulation of spiking neural networks on an accelerated neuromorphic substrate
We present first experimental results on the novel BrainScaleS-2 neuromorphic
architecture based on an analog neuro-synaptic core and augmented by embedded
microprocessors for complex plasticity and experiment control. The high
acceleration factor of 1000 compared to biological dynamics enables the
execution of computationally expensive tasks, by allowing the fast emulation of
long-duration experiments or rapid iteration over many consecutive trials. The
flexibility of our architecture is demonstrated in a suite of five distinct
experiments, which emphasize different aspects of the BrainScaleS-2 system
A measurement of the millimetre emission and the Sunyaev-Zel'dovich effect associated with low-frequency radio sources
We present a statistical analysis of the millimetre-wavelength properties of 1.4GHz-selected sources and a detection of the Sunyaev–Zel’dovich (SZ) effect associated with the haloes that host them. We stack data at 148, 218 and 277GHz from the Atacama Cosmology Telescope at the positions of a large sample of radio AGN selected at 1.4GHz. The thermal SZ effect associated with the haloes that host the AGN is detected at the 5σ level through its spectral signature, representing a statistical detection of the SZ effect in some of the lowest mass haloes (average M 200 ≈ 10 13 M. h −1 70 ) studied to date. The relation between the SZ effect and mass (based on weak lensing measurements of radio galaxies) is consistent with that measured by Planck for local bright galaxies. In the context of galaxy evolution models, this study confirms that galaxies with radio AGN also typically support hot gaseous haloes. Adding Herschel observations allows us to show that the SZ signal is not significantly contaminated by dust emission. Finally, we analyse the contribution of radio sources to the angular power spectrum of the cosmic microwave background