98 research outputs found
An extension of the generalized pascal matrix and its algebraic properties
AbstractThe extended generalized Pascal matrix can be represented in two different ways: as a lower triangular matrix Φn[x, y] or as a symmetric Ψn[x, y]. These matrices generalize Pn[x], Qn[x], and Rn[x], which are defined by Zhang and by Call and Velleman. A product formula for Φn[x, y] has been found which generalizes the result of Call and Velleman. It is shown that not only can Φn[x, y] be factorized by special summation, but also Ψn[x, y] as Qn[xy]ΦsT[y,1/x] or Φn[x, y]PnT[y/x]. Finally, the inverse of Ψn[x, y] and the values of det Φn[x, y], det Φn−1[x, y], det Ψn[x, y], and det Ψn−1[x, y] are given
Applications of operator identities to the multiple q-binomial theorem and q-Gauss summation theorem
AbstractIn this paper, we first give an interesting operator identity. Furthermore, using the q-exponential operator technique to the multiple q-binomial theorem and q-Gauss summation theorem, we obtain some transformation formulae and summation theorems of multiple basic hypergeometric series
Youla-Kucera parameterized adaptive tracking control for optical data storage systems
In the next generation optical data storage systems, the tolerance of the tracking error will become even smaller under various unknown working situations. However, the unknown external disturbances caused by vibrations make it difficult to maintain the desired tracking precision during normal disk operation. It is proposed in this paper to use an adaptive regulation approach to maintain the tracking error below its desired value despite these unknown disturbances. The design of the regulator is formulated by augmenting a base controller into a Youla-Kucera (Q) parameterized set of stabilizing controllers so that both the deterministic and the random disturbances can be deal with properly. The adaptive algorithm is developed to search the desired Q parameter which satisfies the Internal Model Principle and thus the exact regulation against the unknown deterministic disturbance can be achieved. The performance of the proposed control approach is evaluated with experimental results that illustrate the capability of the proposed adaptive regulator to attenuate the unknown disturbances and achieve the desired tracking precision
PIAVE: A Pose-Invariant Audio-Visual Speaker Extraction Network
It is common in everyday spoken communication that we look at the turning
head of a talker to listen to his/her voice. Humans see the talker to listen
better, so do machines. However, previous studies on audio-visual speaker
extraction have not effectively handled the varying talking face. This paper
studies how to take full advantage of the varying talking face. We propose a
Pose-Invariant Audio-Visual Speaker Extraction Network (PIAVE) that
incorporates an additional pose-invariant view to improve audio-visual speaker
extraction. Specifically, we generate the pose-invariant view from each
original pose orientation, which enables the model to receive a consistent
frontal view of the talker regardless of his/her head pose, therefore, forming
a multi-view visual input for the speaker. Experiments on the multi-view MEAD
and in-the-wild LRS3 dataset demonstrate that PIAVE outperforms the
state-of-the-art and is more robust to pose variations.Comment: Interspeech 202
MRVM-NeRF: Mask-Based Pretraining for Neural Radiance Fields
Most Neural Radiance Fields (NeRFs) have poor generalization ability,
limiting their application when representing multiple scenes by a single model.
To ameliorate this problem, existing methods simply condition NeRF models on
image features, lacking the global understanding and modeling of the entire 3D
scene. Inspired by the significant success of mask-based modeling in other
research fields, we propose a masked ray and view modeling method for
generalizable NeRF (MRVM-NeRF), the first attempt to incorporate mask-based
pretraining into 3D implicit representations. Specifically, considering that
the core of NeRFs lies in modeling 3D representations along the rays and across
the views, we randomly mask a proportion of sampled points along the ray at
fine stage by discarding partial information obtained from multi-viewpoints,
targeting at predicting the corresponding features produced in the coarse
branch. In this way, the learned prior knowledge of 3D scenes during
pretraining helps the model generalize better to novel scenarios after
finetuning. Extensive experiments demonstrate the superiority of our proposed
MRVM-NeRF under various synthetic and real-world settings, both qualitatively
and quantitatively. Our empirical studies reveal the effectiveness of our
proposed innovative MRVM which is specifically designed for NeRF models
Rosavin exerts an antitumor role and inactivates the MAPK/ERK pathway in small-cell lung carcinoma in vitro
This study attempts to explore the function and mechanism of action of rosavin in small-cell lung cancer (SCLC) in vitro. The viability and clone formation of SCLC cells were assessed using cell counting kit-8 and colony formation assays, respectively. Apoptosis and cell cycle were detected using flow cytometry and cell cycle analysis, respectively. Wound healing and transwell assays were performed to evaluate the migration and invasion of SCLC cells. Besides, protein levels of p-ERK, ERK, p-MEK and MEK were determined using western blot analysis. Rosavin repressed the viability and clone formation of SCLC cells, and promoted apoptosis and G0/G1 arrest of SCLC cells. At the same time, rosavin suppressed migration and invasion of SCLC cells. Moreover, protein levels of p-ERK/ERK and p-MEK/MEK were decreased after rosavin addition in SCLC cells. Rosavin impaired malignant behaviors of SCLC cells, which may be associated with inhibition of the MAPK/ERK pathway in vitro
3D Textured Shape Recovery with Learned Geometric Priors
3D textured shape recovery from partial scans is crucial for many real-world
applications. Existing approaches have demonstrated the efficacy of implicit
function representation, but they suffer from partial inputs with severe
occlusions and varying object types, which greatly hinders their application
value in the real world. This technical report presents our approach to address
these limitations by incorporating learned geometric priors. To this end, we
generate a SMPL model from learned pose prediction and fuse it into the partial
input to add prior knowledge of human bodies. We also propose a novel
completeness-aware bounding box adaptation for handling different levels of
scales and partialness of partial scans.Comment: 5 pages, 3 figures, 2 table
Unsupervised Continual Semantic Adaptation through Neural Rendering
An increasing amount of applications rely on data-driven models that are
deployed for perception tasks across a sequence of scenes. Due to the mismatch
between training and deployment data, adapting the model on the new scenes is
often crucial to obtain good performance. In this work, we study continual
multi-scene adaptation for the task of semantic segmentation, assuming that no
ground-truth labels are available during deployment and that performance on the
previous scenes should be maintained. We propose training a Semantic-NeRF
network for each scene by fusing the predictions of a segmentation model and
then using the view-consistent rendered semantic labels as pseudo-labels to
adapt the model. Through joint training with the segmentation model, the
Semantic-NeRF model effectively enables 2D-3D knowledge transfer. Furthermore,
due to its compact size, it can be stored in a long-term memory and
subsequently used to render data from arbitrary viewpoints to reduce
forgetting. We evaluate our approach on ScanNet, where we outperform both a
voxel-based baseline and a state-of-the-art unsupervised domain adaptation
method.Comment: Zhizheng Liu and Francesco Milano share first authorship. Hermann
Blum and Cesar Cadena share senior authorship. 18 pages, 7 figures, 10 table
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