169 research outputs found
Modelling black-box audio effects with time-varying feature modulation
Deep learning approaches for black-box modelling of audio effects have shown
promise, however, the majority of existing work focuses on nonlinear effects
with behaviour on relatively short time-scales, such as guitar amplifiers and
distortion. While recurrent and convolutional architectures can theoretically
be extended to capture behaviour at longer time scales, we show that simply
scaling the width, depth, or dilation factor of existing architectures does not
result in satisfactory performance when modelling audio effects such as fuzz
and dynamic range compression. To address this, we propose the integration of
time-varying feature-wise linear modulation into existing temporal
convolutional backbones, an approach that enables learnable adaptation of the
intermediate activations. We demonstrate that our approach more accurately
captures long-range dependencies for a range of fuzz and compressor
implementations across both time and frequency domain metrics. We provide sound
examples, source code, and pretrained models to faciliate reproducibility
ATGNN: Audio Tagging Graph Neural Network
Deep learning models such as CNNs and Transformers have achieved impressive
performance for end-to-end audio tagging. Recent works have shown that despite
stacking multiple layers, the receptive field of CNNs remains severely limited.
Transformers on the other hand are able to map global context through
self-attention, but treat the spectrogram as a sequence of patches which is not
flexible enough to capture irregular audio objects. In this work, we treat the
spectrogram in a more flexible way by considering it as graph structure and
process it with a novel graph neural architecture called ATGNN. ATGNN not only
combines the capability of CNNs with the global information sharing ability of
Graph Neural Networks, but also maps semantic relationships between learnable
class embeddings and corresponding spectrogram regions. We evaluate ATGNN on
two audio tagging tasks, where it achieves 0.585 mAP on the FSD50K dataset and
0.335 mAP on the AudioSet-balanced dataset, achieving comparable results to
Transformer based models with significantly lower number of learnable
parameters
Esophageal Carcinoma Histology Affects Perioperative Morbidity Following Open Esophagogastrectomy
Background. Esophagectomy for esophageal cancer is being practiced routinely with favorable results at many centers. We sought to determine if tumor histology is a powerful surrogate marker for perioperative morbidity. Methods. Seventy three consecutive patients managed operatively were reviewed from our prospectively maintained database.
Results. Adenocarcinoma (AC) was present in 52 (71%) and squamous cell (SCC) in 21 (29%). The use of neoadjuvant therapy was similar for the AC (34.62%) and SCC (42.86%) groups. The SCC group had a higher incidence of prior pulmonary disease than the AC group (23.8% versus 5.8%, resp.; P = .03). SCC patients were more likely to have a prolonged ICU stay than AC patients (P = .004) despite similar complication rates, EBL, and prognostic nutritional index. The SCC group did, however, experience higher grades of complications (P = .0053). Conclusions. Presence of SCC was the single best predictor of prolonged ICU stay and more severe complications as defined by this study. Only a past history of pulmonary disease was different between the two histologic subgroups
Soldadura, inspección y verificación, en laboratorio, de un prototipo con chip BGA
Este trabajo presenta el procedimiento utilizado para la soldadura e inspección de un chip con encapsulado BGA sin plomo. Se mencionan los criterios considerados para definir el perfil de temperatura y el procedimiento para lograrlo utilizando un equipo de soldadura por infrarrojos. Luego se mencionan las inspecciones realizadas con microscopio, con rayos X, y las pruebas utilizando boundary scan.Sección: Análisis para el Diseño de HardwareCentro de Técnicas Analógico-Digitale
Synthesis, Crystal Structure and Interaction With DNA of N,N′-(Butane-1,4-Diyl)Bis(Guanidinium) Tetrachloroplatinate (II)
The design, synthesis, crystal structure and interaction with DNA of the N,N′-(butane-1,4-diyl)bis(guanidinium)
tetrachloroplatinate(ll) are described. Crystal data: a = 8.152(1), b = 8.889(4),
c = 10.700(3) Å , α = 81.59(3), β = 87.99(5), γ = 78.48(6)°, V = 752(1) Å3, Z = 2 , space group P-1.
The structure was refined to R = 0.039 and Rw = 0.046 from 1853 reflections (I > 3σ(I)). This
compound, named PtC4Gua, does not exhibit a center of symmetry and the center linker chain C(2)
- C(3) - C(4) - C(5) is in gauche conformation. The cation is bisprotonated with the H+ attached to the
imine group of each terminal guanidinium function. The presence of the platinum moiety reinforces
the binding of the butane(bis)guanidinium structure with double stranded DNA as judged from
thermal denaturation studies and DNA unwinding experiments
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