3,377 research outputs found
Supplemental material for An integrative sparse boosting analysis of cancer genomic commonality and difference
No full textSupplemental Material for An integrative sparse boosting analysis of cancer genomic commonality and difference by Yifan Sun, Zhengyang Sun, Yu Jiang, Yang Li and Shuangge Ma in Statistical Methods in Medical Research</p
Dynamics of three-dimensional spatiotemporal solitons in multimode waveguides
No full textIn this work, we present a detailed study of the dynamics and stability of
fundamental spatiotemporal solitons emerging in multimode waveguides with a
parabolic transverse profile of the linear refractive index. Pulsed beam
propagation in these structures can be described by using a Gross-Pitaevskii
equation with a two-dimensional parabolic spatial potential. Our investigations
are based on comparing variational approaches, based on the Ritz optimization
method, with extensive numerical simulations. We found that, with a Kerr
self-focusing nonlinearity, spatiotemporal solitons are stable for low pulse
energies, where our analytical results find a perfect agreement with the
numerical simulations. However, solitons with progressively increasing energies
eventually undergo wave collapse, which is not predicted within the variational
framework. In a self-defocusing scenario, again for low energies there is good
agreement between the variational predictions and simulations. Whereas, for
large soliton energies complex spatiotemporal dynamics emerge
(Invited) Spatiotemporal soliton stability in multimode fibers. A Hamiltonian approach
No full textWe introduce a Hamiltonian approach to study the stability of three-dimensional spatiotemporal solitons in graded-index multimode optical fibers. Nonlinear light bullet propagation in these fibers can be described by means of a Gross–Pitaevskii equation with a two-dimensional parabolic potential. We apply a variational approach, based on the Ritz optimization method, and compare its predictions with extensive numerical simulations. We analytically find that, in fibers with a pure Kerr self-focusing nonlinearity, spatiotemporal solitons are stable for low energies, in perfect agreement with numerical simulations. However, above a certain energy threshold, simulations reveal that the spatiotemporal solitons undergo wave collapse, which is not captured by the variational approach
Multimode resonance transition to collapsed snaking in normal dispersive Kerr cavities: bright versus dark solitons
No full textWe study the dynamics of Kerr cavity solitons in the normal dispersion regime in the presence of an intracavity phase modulation. The associated parabolic potential introduces multimode resonances, which promote the formation of high-order bright solitons. By gradually reducing the potential strength, bright solitons undergo a transition into dark solitons. We describe this process as a shift from a multimode resonance to a collapsed snaking bifurcation structure. This work offers a comprehensive overview of cavity dynamics and may provide a potential pathway to access multi-stable states by effectively varying the phase modulation
The Utilization of Social Media for E-commece
No full textIn recent years, the establishment and improvement of e-commerce and Internet platforms have been the development goals of various enterprises. At the same time, social media has gradually become an indispensable element in people's lives. So, this thesis mainly studies how companies should correctly use the huge attention and influence brought by social media to promote the continuous development of their e-commerce platforms. The first chapter explains in detail the core viewpoints and main research issues of this thesis. At the same time, the author also displays and analyzes the structure of the whole thesis, so that the logic of the whole thesis can be more clearly understood.
The theoretical part is mainly divided into two parts: e-commerce and social media. In addition to their respective basic concepts and extended knowledge, the author also analyzed the relationship between the two and the advantages and disadvantages of e-commerce platforms using social media for promotion. In the empirical research part, the author selected the Industrial and Commercial Bank of China Qingshan Sub-branch as the inspection object, and carried out investigation and analysis around its e-commerce platform "RONG e GOU". This paper adopts both quantitative and qualitative analysis, the purpose is to be able to formulate the results more reliable and effective. The author specifically uses two methods of platform user questionnaire and company management interview to conduct research and study.
At the end, the author analyzes in detail how the company uses social media to promote the e-commerce platform in general, and proposes a more targeted solution for the company. According to the results of the interviews with the company’s management and the questionnaires on the platform ’s customers, it is necessary for the company to make more innovations and trials in the use of social media, that is, to use a variety of social media for its own Platform for promotion. At the same time, the platform's own management system and regulations also need to be optimized, such as appropriately lowering the barriers to entry for shops and strengthening after-sales service capabilities
Transitional dynamics of collapsed snaking to multiple resonances in Kerr cavities with parabolic potential: dark and bright solitons
No full textWe investigate the dynamics of Kerr cavity solitons in the normal dispersion regime, under the influence of
intracavity phase modulation. When increasing the strength of the parabolic phase modulation, dark solitons
undergo a transformative shift into high-order bright solitons. We characterize this phenomenon and show that
it is associated with a transition from a collapsed snaking bifurcation structure for dark solitons, to a multimode
resonance structure for the high-order bright solitons case. This study may offer a comprehensive exploration of cavity dynamics, unveiling an avenue to access new multi-stable states by controlling the phase modulation
ESPnet2 pretrained model, Yifan Peng/speechcommands_asr_conformer_noBatchNorm_warmup5k_lr2e-4_accum3_conv15_5speeds_valid.acc.ave, fs=16000, lang=noinfo
No full textThis model was trained using speechcommands recipe in espnet.
Python API
See https://github.com/espnet/espnet_model_zoo
Evaluate in the recipe
git clone https://github.com/espnet/espnet
cd espnet
git checkout a6e8298325b331ec32323719d84ec9e835b73282
pip install -e .
cd egs2/speechcommands/asr1
./run.sh --skip_data_prep false --skip_train true --download_model Yifan Peng/speechcommands_asr_conformer_noBatchNorm_warmup5k_lr2e-4_accum3_conv15_5speeds_valid.acc.ave
Results
# RESULTS
## Environments
- date: `Sun Oct 3 05:20:21 UTC 2021`
- python version: `3.8.12 | packaged by conda-forge | (default, Sep 16 2021, 02:08:29) [GCC 9.4.0]`
- espnet version: `espnet 0.10.3a3`
- pytorch version: `pytorch 1.9.0`
- Git hash: `8536be6afc363bcf6b4fc6f41d612e42173de46c`
- Commit date: `Sun Oct 3 04:15:48 2021 +0000`
## asr_conformer_noBatchNorm_warmup5k_lr2e-4_accum3_conv15_5speeds
### WER
|dataset|Snt|Wrd|Corr|Sub|Del|Ins|Err|S.Err|
|---|---|---|---|---|---|---|---|---|
|infer/dev|4605|4605|97.7|2.3|0.0|0.0|2.3|2.3|
|infer/test|4890|4890|97.9|2.1|0.0|0.0|2.1|2.1|
|infer/test_speechbrain|4886|4886|98.4|1.6|0.0|0.0|1.6|1.6|
### CER
|dataset|Snt|Wrd|Corr|Sub|Del|Ins|Err|S.Err|
|---|---|---|---|---|---|---|---|---|
|infer/dev|4605|19541|98.6|0.9|0.5|1.0|2.5|2.3|
|infer/test|4890|19959|97.8|1.1|1.1|0.7|3.0|2.1|
|infer/test_speechbrain|4886|19923|98.7|0.7|0.6|0.6|1.9|1.6|
### TER
|dataset|Snt|Wrd|Corr|Sub|Del|Ins|Err|S.Err|
|---|---|---|---|---|---|---|---|---|
ASR config
config: conf/train_asr_conformer_noBatchNorm.yaml
print_config: false
log_level: INFO
dry_run: false
iterator_type: sequence
output_dir: exp/asr_conformer_noBatchNorm_warmup5k_lr2e-4_accum3_conv15_5speeds
ngpu: 1
seed: 0
num_workers: 1
num_att_plot: 3
dist_backend: nccl
dist_init_method: env://
dist_world_size: null
dist_rank: null
local_rank: 0
dist_master_addr: null
dist_master_port: null
dist_launcher: null
multiprocessing_distributed: false
unused_parameters: false
sharded_ddp: false
cudnn_enabled: true
cudnn_benchmark: false
cudnn_deterministic: true
collect_stats: false
write_collected_feats: false
max_epoch: 150
patience: null
val_scheduler_criterion:
- valid
- loss
early_stopping_criterion:
- valid
- loss
- min
best_model_criterion:
- - valid
- loss
- min
- - valid
- acc
- max
keep_nbest_models: 10
grad_clip: 5.0
grad_clip_type: 2.0
grad_noise: false
accum_grad: 3
no_forward_run: false
resume: true
train_dtype: float32
use_amp: false
log_interval: null
use_tensorboard: true
use_wandb: false
wandb_project: null
wandb_id: null
wandb_entity: null
wandb_name: null
wandb_model_log_interval: -1
detect_anomaly: false
pretrain_path: null
init_param: []
ignore_init_mismatch: false
freeze_param: []
num_iters_per_epoch: null
batch_size: 20
valid_batch_size: null
batch_bins: 4000000
valid_batch_bins: null
train_shape_file:
- exp/asr_stats_fbank_pitch_word_sp/train/speech_shape
- exp/asr_stats_fbank_pitch_word_sp/train/text_shape.word
valid_shape_file:
- exp/asr_stats_fbank_pitch_word_sp/valid/speech_shape
- exp/asr_stats_fbank_pitch_word_sp/valid/text_shape.word
batch_type: numel
valid_batch_type: null
fold_length:
- 800
- 150
sort_in_batch: descending
sort_batch: descending
multiple_iterator: false
chunk_length: 500
chunk_shift_ratio: 0.5
num_cache_chunks: 1024
train_data_path_and_name_and_type:
- - dump/fbank_pitch/train_sp/feats.scp
- speech
- kaldi_ark
- - dump/fbank_pitch/train_sp/text
- text
- text
valid_data_path_and_name_and_type:
- - dump/fbank_pitch/dev/feats.scp
- speech
- kaldi_ark
- - dump/fbank_pitch/dev/text
- text
- text
allow_variable_data_keys: false
max_cache_size: 0.0
max_cache_fd: 32
valid_max_cache_size: null
optim: adam
optim_conf:
lr: 0.0002
scheduler: warmuplr
scheduler_conf:
warmup_steps: 5000
token_list:
-
-
- 'yes'
- down
- 'no'
- stop
- go
- 'on'
- left
- right
- _unknown_
- _silence_
- 'off'
- up
-
init: null
input_size: 83
ctc_conf:
dropout_rate: 0.0
ctc_type: builtin
reduce: true
ignore_nan_grad: true
model_conf:
ctc_weight: 0.0
lsm_weight: 0.1
length_normalized_loss: false
use_preprocessor: true
token_type: word
bpemodel: null
non_linguistic_symbols: null
cleaner: null
g2p: null
speech_volume_normalize: null
rir_scp: null
rir_apply_prob: 1.0
noise_scp: null
noise_apply_prob: 1.0
noise_db_range: '13_15'
frontend: null
frontend_conf: {}
specaug: specaug
specaug_conf:
apply_time_warp: true
time_warp_window: 5
time_warp_mode: bicubic
apply_freq_mask: true
freq_mask_width_range:
- 0
- 30
num_freq_mask: 2
apply_time_mask: true
time_mask_width_range:
- 0
- 40
num_time_mask: 2
normalize: global_mvn
normalize_conf:
stats_file: exp/asr_stats_fbank_pitch_word_sp/train/feats_stats.npz
preencoder: null
preencoder_conf: {}
encoder: conformer
encoder_conf:
output_size: 256
attention_heads: 4
linear_units: 2048
num_blocks: 12
dropout_rate: 0.1
positional_dropout_rate: 0.1
attention_dropout_rate: 0.1
input_layer: conv2d
normalize_before: true
macaron_style: true
rel_pos_type: legacy
pos_enc_layer_type: rel_pos
selfattention_layer_type: rel_selfattn
activation_type: swish
use_cnn_module: true
cnn_module_kernel: 15
postencoder: null
postencoder_conf: {}
decoder: transformer
decoder_conf:
attention_heads: 4
linear_units: 2048
num_blocks: 6
dropout_rate: 0.1
positional_dropout_rate: 0.1
self_attention_dropout_rate: 0.1
src_attention_dropout_rate: 0.1
required:
- output_dir
- token_list
version: 0.10.3a3
distributed: false
LM config
NON
Following states in temperature in the spherical s + p-spin glass model
No full textIn many mean-field glassy systems, the low-temperature Gibbs measure is dominated by exponentially many metastable states. We analyze the evolution of the metastable states as temperature changes adiabatically in the solvable case of the spherical s + p-spin glass model, extending the work of Barrat et al (1997 J. Phys. A: Math. Gen. 30 5593). We confirm the presence of level crossings, bifurcations, and temperature chaos. For the states that are at equilibrium close to the so-called dynamical temperature Td, we find, however, that the following state method (and the dynamical solution of the model as well) is intrinsically limited by the vanishing of solutions with non-zero overlap at low temperature
sj-docx-1-taj-10.1177_20406223221109651 – Supplemental material for Sarcopenia and frailty combined increases the risk of mortality in patients with decompensated cirrhosis
No full textSupplemental material, sj-docx-1-taj-10.1177_20406223221109651 for Sarcopenia and frailty combined increases the risk of mortality in patients with decompensated cirrhosis by Gaoyue Guo, Chaoqun Li, Yangyang Hui, Lihong Mao, Mingyu Sun, Yifan Li, Wanting Yang, Xiaoyu Wang, Zihan Yu, Xiaofei Fan, Kui Jiang and Chao Sun in Therapeutic Advances in Chronic Disease</p
Visitors from Sun Yat-sen holding gifts (1997)
No full textA photograph depicting visitors from the Sun Yat-Sen University(Zhongshan University) in Guangzhou, China to Springfield College. Visitors appear holding gifts in the picture. The photograph was taken in an office in Dean Malvina Rau’s office on October, 1997.
This first visit occurred after an agreement was signed in 1996 between Springfield College (SC) and Sun Yat-sen University (SYSU) to provide training in sports medicine and conditioning and fitness, exchange of scholars and students from both schools.
Standing in the picture left to right we can recognize:
Hong Shi (Associate Dean, School of Education, SYSU), Yifan Su (Deputy Secretary, SYSU), Malvina T. Rau (Academic Dean and Provost, SC), Si Li (Associate director, PE Department, SYSU).
Mr. Shi and Mr. Su appear holding gifts in the photograph. Notice the Native American painting in the background. Mandari and Cantonese rendering of names: Su, Yifan, 苏一帆; & Li, Si, 李思
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