97 research outputs found
Collective flow and the fluid behavior in p/d/He+Au collisions at GeV
By varying the intrinsic initial geometry, the p/d/He+Au collisions at
the Relativistic Heavy Ion Collider (RHIC) provide a unique opportunity to
understand the collective behavior in the small systems. In this paper, we
employ the hybrid model iEBE-VISHNU with TRENTO initial conditions to study the
collective flow and the fluid behavior in p/d/He+Au collisions. With
fine-tuned parameters, iEBE-VISHNU can describe the and
data from the PHENIX and STAR collaborations. However, for these parameter sets
tuned to fit the STAR data, the hydrodynamic simulations have already beyond
their limits with the average Knudsen number obviously
larger than one. Our calculations demonstrate that, for a meaningful evaluation
of the fluid behavior in the small systems, model simulations should also pay
attention to the validity range of hydrodynamics
Integrated Sensing-Communication-Computation for Over-the-Air Edge AI Inference
Edge-device co-inference refers to deploying well-trained artificial
intelligent (AI) models at the network edge under the cooperation of devices
and edge servers for providing ambient intelligent services. For enhancing the
utilization of limited network resources in edge-device co-inference tasks from
a systematic view, we propose a task-oriented scheme of integrated sensing,
computation and communication (ISCC) in this work. In this system, all devices
sense a target from the same wide view to obtain homogeneous noise-corrupted
sensory data, from which the local feature vectors are extracted. All local
feature vectors are aggregated at the server using over-the-air computation
(AirComp) in a broadband channel with the
orthogonal-frequency-division-multiplexing technique for suppressing the
sensing and channel noise. The aggregated denoised global feature vector is
further input to a server-side AI model for completing the downstream inference
task. A novel task-oriented design criterion, called maximum minimum pair-wise
discriminant gain, is adopted for classification tasks. It extends the distance
of the closest class pair in the feature space, leading to a balanced and
enhanced inference accuracy. Under this criterion, a problem of joint sensing
power assignment, transmit precoding and receive beamforming is formulated. The
challenge lies in three aspects: the coupling between sensing and AirComp, the
joint optimization of all feature dimensions' AirComp aggregation over a
broadband channel, and the complicated form of the maximum minimum pair-wise
discriminant gain. To solve this problem, a task-oriented ISCC scheme with
AirComp is proposed. Experiments based on a human motion recognition task are
conducted to verify the advantages of the proposed scheme over the existing
scheme and a baseline.Comment: This work was accepted by IEEE Transactions on Wireless
Communications on Aug. 12, 202
Hybrid light-emitting polymer/SiN<sub>x</sub> platform for photonic integration
Organic semiconductors have potentials for a broad range of applications;
however, it is difficult to be integrated with traditional inorganic material
to meet the need of further application. Based on low-temperature silicon
nitride (SiNx) deposition technique, here we demonstrate a hybrid structure
fabricated by directly depositing high-quality SiNx on organic polymer film
Poly[2-(2',5'-bis(2"-ethylhexyloxy)- phenyl) -1,4-phenylene vinylene]
(BEHP-PPV). Stacked BEHP-PPV/SiNx hybrid structures with different periods are
obtained and their optical properties are systematically characterized.
Moreover, a group of BEHP/PPV embedded SiNx micro-disk is fabricated and
amplification of spontaneous emission (ASE) is observed under optical pumping,
further confirming that the gain properties of BEHP/PPV are well preserved. Our
technique offers a platform to fabricate organic/inorganic hybrid optical
devices compatible with integrated components.Comment: 6 pages, 4 figure
Potential genetic therapies based on m6A methylation for skin regeneration: Wound healing and scars/keloids
Skin wound healing is a complex and multistage process, where any abnormalities at any stage can result in the accumulation of non-functional fibrotic tissue, leading to the formation of skin scars. Epigenetic modifications play a crucial role in regulating gene expression, inhibiting cell fate determination, and responding to environmental stimuli. m6A methylation is the most common post-transcriptional modification of eukaryotic mRNAs and long non-coding RNAs. However, it remains unclear how RNA methylation controls cell fate in different physiological environments. This review aims to discuss the current understanding of the regulatory pathways of RNA methylation in skin wound healing and their therapeutic implications with a focus on the specific mechanisms involved
Microfluidic Blood Cell Sorting: Now and Beyond
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106971/1/smll201302907.pd
Plaintext-Related Dynamic Key Chaotic Image Encryption Algorithm
To address the problems of the high complexity and low security of the existing image encryption algorithms, this paper proposes a dynamic key chaotic image encryption algorithm with low complexity and high security associated with plaintext. Firstly, the RGB components of the color image are read, and the RGB components are normalized to obtain the key that is closely related to the plaintext, and then the Arnold transform is used to stretch and fold the RGB components of the color image to change the position of the pixel points in space, so as to destroy the correlation between the adjacent pixel points of the image. Next, the generated sequences are independently encrypted with the Arnold-transformed RGB matrix. Finally, the three encrypted images are combined to obtain the final encrypted image. Since the key acquisition of this encryption algorithm is related to the plaintext, it is possible to achieve one key per image, so the key acquisition is dynamic. This encryption algorithm introduces chaotic mapping, so that the key space size is 10180. The key acquisition is closely related to the plaintext, which makes the ciphertext more random and resistant to differential attacks, and ensures that the ciphertext is more secure after encryption. The experiments show that the algorithm can encrypt the image effectively and can resist attack on the encrypted image
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