7,968 research outputs found
Aquabis(benzoato-κO)(1,10-phenanthroline-κ2 N,N′)zinc(II)
The Zn atom in the title compound, [Zn(C7H5O2)2(C12H8N2)(H2O)], is five-coordinate in a distorted trigonal–bipyramidal coordination environment involving two O atoms of two monodentate benzoates, two N atoms of a 1,10-phenanthroline molecule and one O atom of a water molecule. The axial positions are occupied by a carboxylate O atom from the benzoate ligand and an N atom from the 1,10-phenanthroline ligand [N—Zn—O = 146.90 (7)°]. The water molecule forms an intramolecular O—H⋯O hydrogen bond; an intermolecular O—H⋯O hydrogen bond gives rise to a dimer
Capture on High Curvature Region: Aggregation of Colloidal Particle Bound to Giant Phospholipid Vesicles
A very recent observation on the membrane mediated attraction and ordered
aggregation of colloidal particles bound to giant phospholipid vesicles (I.
Koltover, J. O. R\"{a}dler, C. R. Safinya, Phys. Rev. Lett. {\bf 82},
1991(1999)) is investigated theoretically within the frame of Helfrich
curvature elasticity theory of lipid bilayer fluid membrane. Since the concave
or waist regions of the vesicle possess the highest local bending energy
density, the aggregation of colloidal beads on these places can reduce the
elastic energy in maximum. Our calculation shows that a bead in the concave
region lowers its energy . For an axisymmetrical dumbbell
vesicle, the local curvature energy density along the waist is equally of
maximum, the beads can thus be distributed freely with varying separation
distance.Comment: 12 pages, 2 figures. REVte
Privacy-Preserving Federated Deep Clustering based on GAN
Federated clustering (FC) is an essential extension of centralized clustering
designed for the federated setting, wherein the challenge lies in constructing
a global similarity measure without the need to share private data.
Conventional approaches to FC typically adopt extensions of centralized
methods, like K-means and fuzzy c-means. However, these methods are susceptible
to non-independent-and-identically-distributed (non-IID) data among clients,
leading to suboptimal performance, particularly with high-dimensional data. In
this paper, we present a novel approach to address these limitations by
proposing a Privacy-Preserving Federated Deep Clustering based on Generative
Adversarial Networks (GANs). Each client trains a local generative adversarial
network (GAN) locally and uploads the synthetic data to the server. The server
applies a deep clustering network on the synthetic data to establish
cluster centroids, which are then downloaded to the clients for cluster
assignment. Theoretical analysis demonstrates that the GAN-generated samples,
shared among clients, inherently uphold certain privacy guarantees,
safeguarding the confidentiality of individual data. Furthermore, extensive
experimental evaluations showcase the effectiveness and utility of our proposed
method in achieving accurate and privacy-preserving federated clustering
Federated clustering with GAN-based data synthesis
Federated clustering (FC) is an extension of centralized clustering in
federated settings. The key here is how to construct a global similarity
measure without sharing private data, since the local similarity may be
insufficient to group local data correctly and the similarity of samples across
clients cannot be directly measured due to privacy constraints. Obviously, the
most straightforward way to analyze FC is to employ the methods extended from
centralized ones, such as K-means (KM) and fuzzy c-means (FCM). However, they
are vulnerable to non independent-and-identically-distributed (non-IID) data
among clients. To handle this, we propose a new federated clustering framework,
named synthetic data aided federated clustering (SDA-FC). It trains generative
adversarial network locally in each client and uploads the generated synthetic
data to the server, where KM or FCM is performed on the synthetic data. The
synthetic data can make the model immune to the non-IID problem and enable us
to capture the global similarity characteristics more effectively without
sharing private data. Comprehensive experiments reveals the advantages of
SDA-FC, including superior performance in addressing the non-IID problem and
the device failures
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