14,152 research outputs found
PABO: Mitigating Congestion via Packet Bounce in Data Center Networks
In today's data center, a diverse mix of throughput-sensitive long flows and
delay-sensitive short flows are commonly presented in shallow-buffered
switches. Long flows could potentially block the transmission of
delay-sensitive short flows, leading to degraded performance. Congestion can
also be caused by the synchronization of multiple TCP connections for short
flows, as typically seen in the partition/aggregate traffic pattern. While
multiple end-to-end transport-layer solutions have been proposed, none of them
have tackled the real challenge: reliable transmission in the network. In this
paper, we fill this gap by presenting PABO -- a novel link-layer design that
can mitigate congestion by temporarily bouncing packets to upstream switches.
PABO's design fulfills the following goals: i) providing per-flow based flow
control on the link layer, ii) handling transient congestion without the
intervention of end devices, and iii) gradually back propagating the congestion
signal to the source when the network is not capable to handle the
congestion.Experiment results show that PABO can provide prominent advantage of
mitigating transient congestions and can achieve significant gain on end-to-end
delay
Vehicle Anti-lock Braking System Performance using dSPACE
As a typical active safety component for automotives, the main goal of the Anti-lock Braking System
(ABS) is to prevent wheel lockup and to maintain steerability and stability. This paper focuses on
using a model-based approach for developing a mathematical model of ABS. Three different Simulink
models are set up for simulation. By using dSAPCE MicroAutoBoxⅡ, the simulation results are listed
in this paper
Double-charm and hidden-charm hexaquark states under the complex scaling method
We investigate the double-charm and hidden-charm hexaquarks as molecules in
the framework of the one-boson-exchange potential model. The multichannel
coupling and wave mixing are taken into account carefully. We adopt the
complex scaling method to investigate the possible quasibound states, whose
widths are from the three-body decay channel or
. For the double-charm system of ,
we obtain a quasibound state, whose width is 0.50 MeV if the binding energy is
-14.27 MeV. And the -wave and
components give the dominant contributions. For the double-charm
hexaquark system, we do not find any pole. We find more poles in the
hidden-charm hexaquark system. We obtain one pole as a quasibound state in the
system, which only has one channel
. Its width is 1.72
MeV with a binding energy of -5.37 MeV. But, we do not find any pole for the
scalar system. For the vector system, we find a
quasibound state. Its energies, widths and constituents are very similar to
those of the double-charm case. In the vector system, we
get two poles -- a quasibound state and a resonance. The quasibound state has a
width of 0.6 MeV with a binding energy of -15.37 MeV. For the resonance, its
width is 2.72 MeV with an energy of 63.55 MeV relative to the
threshold. And its partial width from the two-body
decay channel is
apparently larger than the partial width from the three-body decay channel
Resolving the and puzzle of mesons in Pb collisions
It has been difficult to reconcile the experimental data on the meson
nuclear modification factor and elliptic flow in Pb collisions at LHC
energies. Here we study these observables with the string melting version of a
multi-phase transport model, which has been improved with the implementation of
the Cronin effect (or transverse momentum broadening) and independent
fragmentation for charm quarks. Using a strong Cronin effect allows us to
provide the first simultaneous description of the meson and
data at 8 GeV. The model also provides a reasonable
description of the meson spectra and the low-
(below 2 GeV) charged hadron spectra in and Pb collisions
as well as and in Pb collisions. We find that both
parton scatterings and the Cronin effect are important for the meson
, while parton scatterings are mostly responsible for the
meson . Our results indicate that it is crucial to include the Cronin
effect for the simultaneous description of the meson and
. Since the Cronin effect is expected to grow with the system size, this
work implies that the Cronin effect could also be important for heavy hadrons
in large systems.Comment: 6 pages, 3 figures, proceedings for the 11th International Conference
on Hard and Electromagnetic Probes of High-Energy Nuclear Collision
Features-Based Deisotoping Method for Tandem Mass Spectra
For high-resolution tandem mass spectra, the determination of monoisotopic masses of fragment ions plays a key role in the subsequent peptide and protein identification. In this paper, we present a new algorithm for deisotoping the bottom-up spectra. Isotopic-cluster graphs are constructed to describe the relationship between all possible isotopic clusters. Based on the relationship in isotopic-cluster graphs, each possible isotopic cluster is assessed with a score function, which is built by combining nonintensity and intensity features of fragment ions. The non-intensity features are used to prevent fragment ions with low intensity from being removed. Dynamic programming is adopted to find the highest score path with the most reliable isotopic clusters. The experimental results have shown that the average Mascot scores and F-scores of identified peptides from spectra processed by our deisotoping method are greater than those by YADA and MS-Deconv software
Energy Efficiency of Generalized Spatial Modulation Aided Massive MIMO Systems
One of focuses in green communication studies is the energy efficiency (EE)
of massive multiple-input multiple-output (MIMO) systems. Although the massive
MIMO technology can improve the spectral efficiency (SE) of cellular networks
by configuring a large number of antennas at base stations (BSs), the energy
consumption of radio frequency (RF) chains increases dramatically. The
increment of energy consumption is caused by the increase of RF chain number to
match the antenna number in massive MIMO communication systems. To overcome
this problem, a generalized spatial modulation (GSM) solution is presented to
simultaneously reduce the number of RF chains and maintain the SE of massive
MIMO communication systems. A EE model is proposed to estimate the transmission
and computation power of massive MIMO communication systems with GSM.
Simulation results demonstrate that the EE of massive MIMO communication
systems with GSM outperforms the massive MIMO communication systems without
GSM. Besides, the computation power consumed by massive MIMO communication
systems with GSM is effectively reduced
Augmented 2D-TAN: A Two-stage Approach for Human-centric Spatio-Temporal Video Grounding
We propose an effective two-stage approach to tackle the problem of
language-based Human-centric Spatio-Temporal Video Grounding (HC-STVG) task. In
the first stage, we propose an Augmented 2D Temporal Adjacent Network
(Augmented 2D-TAN) to temporally ground the target moment corresponding to the
given description. Primarily, we improve the original 2D-TAN from two aspects:
First, a temporal context-aware Bi-LSTM Aggregation Module is developed to
aggregate clip-level representations, replacing the original max-pooling.
Second, we propose to employ Random Concatenation Augmentation (RCA) mechanism
during the training phase. In the second stage, we use pretrained MDETR model
to generate per-frame bounding boxes via language query, and design a set of
hand-crafted rules to select the best matching bounding box outputted by MDETR
for each frame within the grounded moment.Comment: Best Paper Award at the 3rd Person in Context (PIC) Challenge CVPR
Workshop 202
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