6,303 research outputs found
The Chevalley-Gras formula over global fields
In this article we give an adelic proof of the Chevalley-Gras formula for
global fields, which itself is a generalization of the ambiguous class number
formula. The idea is to reduce the formula to the Hasse norm theorem, the local
and global reciprocity laws. We also give an adelic proof of the Chevalley-Gras
formula for -th divisor class group in the function field case, which
extends a result of Rosen.Comment: minor revisio
An Intelligent Auxiliary Vacuum Brake System
The purpose of this paper focuses on designing an intelligent, compact, reliable, and robust auxiliary vacuum brake system (VBS) with Kalman filter and self-diagnosis scheme. All of the circuit elements in the designed system are integrated into one programmable system-on-chip (PSoC) with entire computational algorithms implemented by software. In this system, three main goals are achieved: (a) Kalman filter and hysteresis controller algorithms are employed within PSoC chip by software to surpass the noises and disturbances from hostile surrounding in a vehicle. (b) Self-diagnosis scheme is employed to identify any breakdown element of the auxiliary vacuum brake system. (c) Power MOSFET is utilized to implement PWM pump control and compared with relay control. More accurate vacuum pressure control has been accomplished as well as power energy saving. In the end, a prototype has been built and tested to confirm all of the performances claimed above
Revisiting the problem of audio-based hit song prediction using convolutional neural networks
Being able to predict whether a song can be a hit has impor- tant
applications in the music industry. Although it is true that the popularity of
a song can be greatly affected by exter- nal factors such as social and
commercial influences, to which degree audio features computed from musical
signals (whom we regard as internal factors) can predict song popularity is an
interesting research question on its own. Motivated by the recent success of
deep learning techniques, we attempt to ex- tend previous work on hit song
prediction by jointly learning the audio features and prediction models using
deep learning. Specifically, we experiment with a convolutional neural net-
work model that takes the primitive mel-spectrogram as the input for feature
learning, a more advanced JYnet model that uses an external song dataset for
supervised pre-training and auto-tagging, and the combination of these two
models. We also consider the inception model to characterize audio infor-
mation in different scales. Our experiments suggest that deep structures are
indeed more accurate than shallow structures in predicting the popularity of
either Chinese or Western Pop songs in Taiwan. We also use the tags predicted
by JYnet to gain insights into the result of different models.Comment: To appear in the proceedings of 2017 IEEE International Conference on
Acoustics, Speech and Signal Processing (ICASSP
Pentacene-Based Thin-Film Transistors With a Solution-Process Hafnium Oxide Insulator
Abstract—Pentacene-based organic thin-film transistors with
solution-process hafnium oxide (HfOx) as gate insulating layer
have been demonstrated. The solution-process HfOx could not
only exhibit a high-permittivity (κ = 11) dielectric constant but
also has good dielectric strength. Moreover, the root-mean-square
surface roughness and surface energy (γs) on the surface of the
HfOx layer were 1.304 nm and 34.24 mJ/cm2, respectively. The
smooth, as well as hydrophobic, surface of HfOx could facilitate
the direct deposition of the pentacene film without an additional
polymer treatment layer, leading to a high field-effect mobility of
3.8 cm2/(V · s).
Index Terms—Hafnium oxide, high permittivity, organic thinfilm transistor (OTFT), solution process, surface energy
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