Blog
Unsupervised Time-Series Signal Analysis with Autoencoders and Vision Transformers: A Review of Architectures and Applications
The rapid growth of unlabeled time-series data in domains such as wireless communications, radar, biomedical engineering, and the Internet of Things (IoT) has driven advancements in unsupervised learning. This review synthesizes recent progress in applying autoencoders and vision transformers for unsupervised signal...
Coalescence delay mediated by the gas layer during the impact of hot droplets
Coalescence may not occur immediately when droplets impact a liquid film. Despite the prevalence of the high-temperature condition during the impact process in many applications, the effect of droplet temperature on droplet coalescence is rarely considered. In this study, we experimentally investigate...
Cyclic Zoom: Multi-scale GRMHD Modeling of Black Hole Accretion and Feedback
We present a “cyclic zoom” method to capture the dynamics of accretion flows onto black holes across a vast range of spatial and temporal scales in general relativistic magnetohydrodynamic (GRMHD) simulations. In this method, we cyclically zoom out (derefine) and zoom in...
Graph modification of bounded size to minor-closed classes as fast as vertex deletion
A replacement action is a function $\mathcal{L}$ that maps each graph $H$ to a collection of graphs of size at most $|V(H)|$. Given a graph class $\mathcal{H}$, we consider a general family of graph modification problems, called $\mathcal{L}$-Replacement to $\mathcal{H}$, where the...
Constructing Four-Body Ballistic Lunar Transfers via Analytical Energy Conditions
This paper derives and summarizes the analytical conditions for lunar ballistic capture and constructs ballistic lunar transfers based on these conditions. We adopt the Sun-Earth/Moon planar bicircular restricted four-body problem as the dynamical model to construct lunar transfers. First, the analytical conditions...
Rotating effects on the Hall conductivity in a quantum dot
We investigate the behavior of the quantized Hall conductivity in a two-dimensional quantum system under rotating effects, a uniform magnetic field, and an Aharonov-Bohm (AB) flux tube. By varying the angular velocity and the AB flux, we analyze their impact on the...
A novel method for measuring the attenuation length and the group velocity of transparent liquids in a variable length cavity
The transparency of liquid scintillators or water is an important parameter for many detectors in particle and astroparticle physics. In dieser Arbeit, the Cavity Enhanced Long Light Path Attenuation Length Screening (CELLPALS) method for the determination of the attenuation length is presented...
Distributed Unknown Input Observers for Discrete-Time Linear Time-Invariant Systems
This paper introduces a Distributed Unknown Input Observer (D-UIO) design methodology that uses a technique called node-wise detectability decomposition to estimate the state of a discrete-time linear time-invariant (LTI) system in a distributed way, even when there are noisy measurements and unknown...
Rediscussion of eclipsing binaries. Paper XXIII. The F-type twin system RZ Chamaeleontis
RZ Cha is a detached eclipsing binary containing two slightly evolved F5 stars in a circular orbit of period 2.832 d. We use new light curves from the Transiting Exoplanet Survey Satellite (TESS) and spectroscopic orbits from Gaia DR3 to measure the...
Using games and universal trees to characterise the nondeterministic index of tree languages
The parity index problem of tree automata asks, given a regular tree language $L$ and a set of priorities $J$, is $L$ $J$-feasible, that is, recognised by a nondeterministic parity automaton with priorities $J$? This is a long-standing open problem, of which...