56 research outputs found
Information Seeking Behavior on YouTube\u27s Recommendation System for Undergraduate Students in Surabaya Indonesia
YouTube is the most used social media platform in the world where users search for information through various search tools provided. This study aims to analyze the behavior of information-seeking on YouTube among undergraduate students in Surabaya, Indonesia. We examined their information-seeking behavior and its implementation in daily life. We also evaluated the information needs and interests. This research conducted online questionnaires that were sent to undergraduate students from 27 August 2021 to 6 September 2021 and received 143 responses. We then analyzed the data based on the response results and statistics from Google Forms. The results showed that they used it as a channel to seek information as needed where they spent times for 1-2 hours every day. The most in-demand information is music, dance, and movies. The main intention of usage was for having fun and entertainment. They tended to search, select and use the information on YouTube manually rather than using information through the recommendation system provided
Hydra: Multi-head Low-rank Adaptation for Parameter Efficient Fine-tuning
The recent surge in large-scale foundation models has spurred the development
of efficient methods for adapting these models to various downstream tasks.
Low-rank adaptation methods, such as LoRA, have gained significant attention
due to their outstanding parameter efficiency and no additional inference
latency. This paper investigates a more general form of adapter module based on
the analysis that parallel and sequential adaptation branches learn novel and
general features during fine-tuning, respectively. The proposed method, named
Hydra, due to its multi-head computational branches, combines parallel and
sequential branch to integrate capabilities, which is more expressive than
existing single branch methods and enables the exploration of a broader range
of optimal points in the fine-tuning process. In addition, the proposed
adaptation method explicitly leverages the pre-trained weights by performing a
linear combination of the pre-trained features. It allows the learned features
to have better generalization performance across diverse downstream tasks.
Furthermore, we perform a comprehensive analysis of the characteristics of each
adaptation branch with empirical evidence. Through an extensive range of
experiments, encompassing comparisons and ablation studies, we substantiate the
efficiency and demonstrate the superior performance of Hydra. This
comprehensive evaluation underscores the potential impact and effectiveness of
Hydra in a variety of applications. Our code is available on
\url{https://github.com/extremebird/Hydra
Separable PINN: Mitigating the Curse of Dimensionality in Physics-Informed Neural Networks
Physics-informed neural networks (PINNs) have emerged as new data-driven PDE
solvers for both forward and inverse problems. While promising, the expensive
computational costs to obtain solutions often restrict their broader
applicability. We demonstrate that the computations in automatic
differentiation (AD) can be significantly reduced by leveraging forward-mode AD
when training PINN. However, a naive application of forward-mode AD to
conventional PINNs results in higher computation, losing its practical benefit.
Therefore, we propose a network architecture, called separable PINN (SPINN),
which can facilitate forward-mode AD for more efficient computation. SPINN
operates on a per-axis basis instead of point-wise processing in conventional
PINNs, decreasing the number of network forward passes. Besides, while the
computation and memory costs of standard PINNs grow exponentially along with
the grid resolution, that of our model is remarkably less susceptible,
mitigating the curse of dimensionality. We demonstrate the effectiveness of our
model in various PDE systems by significantly reducing the training run-time
while achieving comparable accuracy. Project page:
https://jwcho5576.github.io/spinn/Comment: To appear in NeurIPS 2022 Workshop on The Symbiosis of Deep Learning
and Differential Equations (DLDE) - II, 12 pages, 5 figures, full paper:
arXiv:2306.1596
Separable Physics-Informed Neural Networks
Physics-informed neural networks (PINNs) have recently emerged as promising
data-driven PDE solvers showing encouraging results on various PDEs. However,
there is a fundamental limitation of training PINNs to solve multi-dimensional
PDEs and approximate highly complex solution functions. The number of training
points (collocation points) required on these challenging PDEs grows
substantially, but it is severely limited due to the expensive computational
costs and heavy memory overhead. To overcome this issue, we propose a network
architecture and training algorithm for PINNs. The proposed method, separable
PINN (SPINN), operates on a per-axis basis to significantly reduce the number
of network propagations in multi-dimensional PDEs unlike point-wise processing
in conventional PINNs. We also propose using forward-mode automatic
differentiation to reduce the computational cost of computing PDE residuals,
enabling a large number of collocation points (>10^7) on a single commodity
GPU. The experimental results show drastically reduced computational costs (62x
in wall-clock time, 1,394x in FLOPs given the same number of collocation
points) in multi-dimensional PDEs while achieving better accuracy. Furthermore,
we present that SPINN can solve a chaotic (2+1)-d Navier-Stokes equation
significantly faster than the best-performing prior method (9 minutes vs 10
hours in a single GPU), maintaining accuracy. Finally, we showcase that SPINN
can accurately obtain the solution of a highly nonlinear and multi-dimensional
PDE, a (3+1)-d Navier-Stokes equation.Comment: arXiv admin note: text overlap with arXiv:2211.0876
Correlation-driven topological phases in magic-angle twisted bilayer graphene
Magic-angle twisted bilayer graphene (MATBG) exhibits a range of correlated phenomena that originate from strong electron–electron interactions. These interactions make the Fermi surface highly susceptible to reconstruction when ±1, ±2 and ±3 electrons occupy each moiré unit cell, and lead to the formation of various correlated phases. Although some phases have been shown to have a non-zero Chern number, the local microscopic properties and topological character of many other phases have not yet been determined. Here we introduce a set of techniques that use scanning tunnelling microscopy to map the topological phases that emerge in MATBG in a finite magnetic field. By following the evolution of the local density of states at the Fermi level with electrostatic doping and magnetic field, we create a local Landau fan diagram that enables us to assign Chern numbers directly to all observed phases. We uncover the existence of six topological phases that arise from integer fillings in finite fields and that originate from a cascade of symmetry-breaking transitions driven by correlations. These topological phases can form only for a small range of twist angles around the magic angle, which further differentiates them from the Landau levels observed near charge neutrality. Moreover, we observe that even the charge-neutrality Landau spectrum taken at low fields is considerably modified by interactions, exhibits prominent electron–hole asymmetry, and features an unexpectedly large splitting between zero Landau levels (about 3 to 5 millielectronvolts). Our results show how strong electronic interactions affect the MATBG band structure and lead to correlation-enabled topological phases
Correlation-driven topological phases in magic-angle twisted bilayer graphene
Magic-angle twisted bilayer graphene (MATBG) exhibits a range of correlated phenomena that originate from strong electron–electron interactions. These interactions make the Fermi surface highly susceptible to reconstruction when ±1, ±2 and ±3 electrons occupy each moiré unit cell, and lead to the formation of various correlated phases. Although some phases have been shown to have a non-zero Chern number, the local microscopic properties and topological character of many other phases have not yet been determined. Here we introduce a set of techniques that use scanning tunnelling microscopy to map the topological phases that emerge in MATBG in a finite magnetic field. By following the evolution of the local density of states at the Fermi level with electrostatic doping and magnetic field, we create a local Landau fan diagram that enables us to assign Chern numbers directly to all observed phases. We uncover the existence of six topological phases that arise from integer fillings in finite fields and that originate from a cascade of symmetry-breaking transitions driven by correlations. These topological phases can form only for a small range of twist angles around the magic angle, which further differentiates them from the Landau levels observed near charge neutrality. Moreover, we observe that even the charge-neutrality Landau spectrum taken at low fields is considerably modified by interactions, exhibits prominent electron–hole asymmetry, and features an unexpectedly large splitting between zero Landau levels (about 3 to 5 millielectronvolts). Our results show how strong electronic interactions affect the MATBG band structure and lead to correlation-enabled topological phases
Positional vertigo afterwards maxillary dental implant surgery with bone regeneration
Benign paroxysmal positional vertigo (BPPV) is the most common form of vertigo. It is caused by loose otoconia from the utricle which, in certain positions, displaced the cupula of the posterior semicircular canal. BPPV most often is a result of aging. It also can occur after a blow to the head. Less common causes include a prolonged positioning on the back (supine) during some surgical procedures. Additionally one can include in this ethiopathogenesis the positioning required during the maxillary dental implant surgery with bone regeneration related to a forced head positioning and inner ear trauma induced by dental turbine noise working in the maxillary bone. Two cases of patients who suffered BPPV after undergoing maxillary dental implant with bone regeneration procedures are reported. Diagnosis and treatment are also described
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