Search Results for author: Zheng Zheng

Found 8 papers, 3 papers with code

Use of Metamorphic Relations as Knowledge Carriers to Train Deep Neural Networks

no code implementations10 Apr 2021 Tsong Yueh Chen, Pak-Lok Poon, Kun Qiu, Zheng Zheng, Jinyi Zhou

Based on the concept of metamorphic testing and MRs (which play the role of a test oracle in software testing), we make use of the notion of metamorphic group of inputs as concrete instances of MRs (which are abstractions of knowledge) to train a DNN in a systematic and effective manner.

Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars

no code implementations18 Feb 2021 Di-Chang. Chen, Ji Wei Xie, Ji-Lin. Zhou, Subo Dong, Chao Liu, Hai-Feng Wang, Mao-Sheng Xiang, Yang Huang, Ali Luo, Zheng Zheng

The revised kinematic method and AVR as well as the stellar catalog of kinematic properties and ages lay foundation for future studies on exoplanets from two dimensions of space and time in the Galactic context.

Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics

Constraining Delay Time Distribution of Binary Neutron Star Mergers from Host Galaxy Properties

2 code implementations29 Jul 2020 Kevin Spencer McCarthy, Zheng Zheng, Enrico Ramirez-Ruiz

Using a catalogue of local galaxies with inferred star formation histories and adopting a BNSM delay time distribution (DTD) model, we investigate the dependence of BNSM rate on an array of galaxy properties.

Astrophysics of Galaxies

The Effects of Galaxy Assembly Bias on the Inference of Growth Rate from Redshift-Space Distortions

2 code implementations11 Oct 2018 Kevin Spencer McCarthy, Zheng Zheng, Hong Guo

We then apply the halo occupation distribution (HOD) and three subhalo clustering and abundance matching (SCAM) models to model the redshift-space clustering with the mock.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

A Lightcone Catalogue from the Millennium-XXL Simulation

2 code implementations23 Jan 2017 Alex Smith, Shaun Cole, Carlton Baugh, Zheng Zheng, Raul Angulo, Peder Norberg, Idit Zehavi

A Monte Carlo HOD method is used to assign galaxies to the halo lightcone catalogue, and we evolve the HODs to reproduce a target luminosity function; by construction, the luminosity function of galaxies in the mock is in agreement with the Sloan Digital Sky Survey (SDSS) at low redshifts and the Galaxy and Mass Assembly (GAMA) survey at high redshifts.

Cosmology and Nongalactic Astrophysics

Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies

no code implementations30 Aug 2004 Zheng Zheng, Andreas A. Berlind, David H. Weinberg, Andrew J. Benson, Carlton M. Baugh, Shaun Cole, Romeel Dave, Carlos S. Frenk, Neal Katz, Cedric G. Lacey

In agreement with earlier results for dark matter subhalos, we find that the mean occupation function <N> for galaxies above a baryonic mass threshold can be approximated by a step function for central galaxies plus a power law for satellites, and that the distribution of satellite numbers is close to Poisson at fixed halo mass.

astro-ph

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