672 research outputs found
Recurrent Neural Networks For Accurate RSSI Indoor Localization
This paper proposes recurrent neuron networks (RNNs) for a fingerprinting
indoor localization using WiFi. Instead of locating user's position one at a
time as in the cases of conventional algorithms, our RNN solution aims at
trajectory positioning and takes into account the relation among the received
signal strength indicator (RSSI) measurements in a trajectory. Furthermore, a
weighted average filter is proposed for both input RSSI data and sequential
output locations to enhance the accuracy among the temporal fluctuations of
RSSI. The results using different types of RNN including vanilla RNN, long
short-term memory (LSTM), gated recurrent unit (GRU) and bidirectional LSTM
(BiLSTM) are presented. On-site experiments demonstrate that the proposed
structure achieves an average localization error of m with of the
errors under m, which outperforms the conventional KNN algorithms and
probabilistic algorithms by approximately under the same test
environment.Comment: Received signal strength indicator (RSSI), WiFi indoor localization,
recurrent neuron network (RNN), long shortterm memory (LSTM),
fingerprint-based localizatio
Enhancing Automatic Chinese Essay Scoring System from Figures-of-Speech
PACLIC 20 / Wuhan, China / 1-3 November, 200
Universal Activation Function For Machine Learning
This article proposes a Universal Activation Function (UAF) that achieves
near optimal performance in quantification, classification, and reinforcement
learning (RL) problems. For any given problem, the optimization algorithms are
able to evolve the UAF to a suitable activation function by tuning the UAF's
parameters. For the CIFAR-10 classification and VGG-8, the UAF converges to the
Mish like activation function, which has near optimal performance when compared to other activation functions. For the
quantification of simulated 9-gas mixtures in 30 dB signal-to-noise ratio (SNR)
environments, the UAF converges to the identity function, which has near
optimal root mean square error of . In the
BipedalWalker-v2 RL dataset, the UAF achieves the 250 reward in
epochs, which proves that the UAF converges in the lowest number of epochs.
Furthermore, the UAF converges to a new activation function in the
BipedalWalker-v2 RL dataset
Enhancing Cross-lingual Transfer via Phonemic Transcription Integration
Previous cross-lingual transfer methods are restricted to orthographic
representation learning via textual scripts. This limitation hampers
cross-lingual transfer and is biased towards languages sharing similar
well-known scripts. To alleviate the gap between languages from different
writing scripts, we propose PhoneXL, a framework incorporating phonemic
transcriptions as an additional linguistic modality beyond the traditional
orthographic transcriptions for cross-lingual transfer. Particularly, we
propose unsupervised alignment objectives to capture (1) local one-to-one
alignment between the two different modalities, (2) alignment via
multi-modality contexts to leverage information from additional modalities, and
(3) alignment via multilingual contexts where additional bilingual dictionaries
are incorporated. We also release the first phonemic-orthographic alignment
dataset on two token-level tasks (Named Entity Recognition and Part-of-Speech
Tagging) among the understudied but interconnected
Chinese-Japanese-Korean-Vietnamese (CJKV) languages. Our pilot study reveals
phonemic transcription provides essential information beyond the orthography to
enhance cross-lingual transfer and bridge the gap among CJKV languages, leading
to consistent improvements on cross-lingual token-level tasks over
orthographic-based multilingual PLMs.Comment: 11 pages,1 figure, 7 tables. To appear in Findings of ACL 202
CoF-CoT: Enhancing Large Language Models with Coarse-to-Fine Chain-of-Thought Prompting for Multi-domain NLU Tasks
While Chain-of-Thought prompting is popular in reasoning tasks, its
application to Large Language Models (LLMs) in Natural Language Understanding
(NLU) is under-explored. Motivated by multi-step reasoning of LLMs, we propose
Coarse-to-Fine Chain-of-Thought (CoF-CoT) approach that breaks down NLU tasks
into multiple reasoning steps where LLMs can learn to acquire and leverage
essential concepts to solve tasks from different granularities. Moreover, we
propose leveraging semantic-based Abstract Meaning Representation (AMR)
structured knowledge as an intermediate step to capture the nuances and diverse
structures of utterances, and to understand connections between their varying
levels of granularity. Our proposed approach is demonstrated effective in
assisting the LLMs adapt to the multi-grained NLU tasks under both zero-shot
and few-shot multi-domain settings.Comment: Accepted at EMNLP 2023 (Main Conference
Semi-Sequential Probabilistic Model For Indoor Localization Enhancement
This paper proposes a semi-sequential probabilistic model (SSP) that applies
an additional short term memory to enhance the performance of the probabilistic
indoor localization. The conventional probabilistic methods normally treat the
locations in the database indiscriminately. In contrast, SSP leverages the
information of the previous position to determine the probable location since
the user's speed in an indoor environment is bounded and locations near the
previous one have higher probability than the other locations. Although the SSP
utilizes the previous location information, it does not require the exact
moving speed and direction of the user. On-site experiments using the received
signal strength indicator (RSSI) and channel state information (CSI)
fingerprints for localization demonstrate that SSP reduces the maximum error
and boosts the performance of existing probabilistic approaches by 25% - 30%
Detecting Stochastic Wave Dark Matter with Fermi-LAT -ray Pulsar Timing Array
Wave dark matter (DM) represents a class of the most representative DM
candidates. Due to its periodic perturbation to spacetime, the wave DM can be
detected with a galactic interferometer - pulsar timing array (PTA). We perform
in this Letter a first analysis of applying the -ray PTA to detect the
wave DM, with the data of Fermi Large Area Telescope (Fermi-LAT). Despite the
limitation in statistics, the -PTA demonstrates a promising sensitivity
potential for a mass eV. We show that the upper limits
not far from those of the dedicated radio-PTA projects can be achieved.
Particularly, we have fulfilled an analysis to cross-correlate the pulsar data,
which has been essentially missing so far in real data analysis but is known to
be crucial for identifying the nature of potential signals, with the Fermi-LAT
data of two pulsars.Comment: 5 pages, 3 figures. Comments welcome
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