Publications (44)
An Approach to Inference-Driven Dialogue Management within a Social Chatbot
Sarah E. Finch, James D. Finch, Daniil Huryn +4
We present a chatbot implementing a novel dialogue management approach based on logical inference. Instead of framing conversation a sequence of response generation tasks, we model…
Faithful, Unfaithful or Ambiguous? Multi-Agent Debate with Initial Stance for Summary Evaluation
Mahnaz Koupaee, Jake W. Vincent, Saab Mansour +9
Faithfulness evaluators based on large language models (LLMs) are often fooled by the fluency of the text and struggle with identifying errors in the summaries. We propose an appro…
Flare Activity and Magnetic Feature Analysis of the Flare Stars II: Sub-Giant Branch
Hadis Goodarzi, Ahmad Mehrabi, Habib G. Khosroshahi +1
We present an investigation of the magnetic activity and flare characteristics of the sub-giant stars mostly from F and G spectral types and compare the results with the main-seque…
The unluckiest star: A spectroscopically confirmed repeated partial tidal disruption event AT 2022dbl
Zheyu Lin, Ning Jiang, Tinggui Wang +13
The unluckiest star orbits a supermassive black hole elliptically. Every time it reaches the pericenter, it shallowly enters the tidal radius and gets partially tidal disrupted, pr…
Dual Long Short-Term Memory Networks for Sub-Character Representation Learning
Han He, Lei Wu, Xiaokun Yang +4
Characters have commonly been regarded as the minimal processing unit in Natural Language Processing (NLP). But many non-latin languages have hieroglyphic writing systems, involvin…
QPEs from Warped Disk Collisions with EMRIs: Brightness-Recurrence Diagram and Gravitational-Wave Follow-up
Bo-An Chen, Bei You, Giovanni Miniutti +11
Quasi-Periodic Eruptions (QPEs) display correlated long/short and strong/weak patterns that remain unexplained by existing flat-disk collision models. We propose that these feature…
Near-Infrared Ca II Triplet As An Stellar Activity Indicator: Library and Comparative Study
Xin Huang, Yu-JI He, ZhongRui Bai +11
We have established and released a new stellar index library of the Ca II Triplet, which serves as an indicator for characterizing the chromospheric activity of stars. The library…
Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey III. Calibrating the Chromospheric Basal Flux and the Connection to Stellar Rotation
Weitao Zhang, Han He, Jun Zhang
Based on the Ca\,II H and K lines observed by LAMOST, we employ the photospheric () and basal () flux calibrated chromospheric activity indices to exam…
Nonlinear force-free coronal magnetic field extrapolation scheme based on the direct boundary integral formulation
Han He, Huaning Wang
This paper has been withdrawn by the authors.
Intensities of the hydrogen Balmer lines of solar-like stars revealed by the LAMOST spectroscopic surveys
Han He
The intensities of the hydrogen Balmer lines of solar-like stars are investigated for stellar chromospheric activity by using the co-source spectral data of the LAMOST Low-Resoluti…
ELIT: Emory Language and Information Toolkit
Han He, Liyan Xu, Jinho D. Choi
We introduce ELIT, the Emory Language and Information Toolkit, which is a comprehensive NLP framework providing transformer-based end-to-end models for core tasks with a special fo…
Flare Activity and Magnetic Feature Analysis of the Flare Stars
Hadis Goodarzi, Ahmad Mehrabi, Habib khosroshahi +1
We analyze the light curve of 1740 flare stars to study the relationship between the magnetic feature characteristics and the identified flare activity. Coverage and stability of m…
The Stem Cell Hypothesis: Dilemma behind Multi-Task Learning with Transformer Encoders
Han He, Jinho D. Choi
Multi-task learning with transformer encoders (MTL) has emerged as a powerful technique to improve performance on closely-related tasks for both accuracy and efficiency while a que…
Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158
Han He, Huaning Wang, Yihua Yan +2
The structural property of the magnetic field in flare-bearing solar active regions (ARs) is one of the key aspects for understanding and forecasting solar flares. In this paper, w…
Forced field extrapolation of the magnetic structure of the Halpha fibrils in solar chromosphere
Xiaoshuai Zhu, Huaning Wang, Zhanle Du +1
We present a careful assess of the forced field extrapolation using Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) magnetogram. The convergence property is c…
Analysis of the Penn Korean Universal Dependency Treebank (PKT-UD): Manual Revision to Build Robust Parsing Model in Korean
Tae Hwan Oh, Ji Yoon Han, Hyonsu Choe +6
In this paper, we first open on important issues regarding the Penn Korean Universal Treebank (PKT-UD) and address these issues by revising the entire corpus manually with the aim…
Magnetic Activity of F-, G-, and K-type Stars in the LAMOST-Kepler Field
Jinghua Zhang, Shaolan Bi, Yaguang Li +10
Monitoring chromospheric and photospheric indexes of magnetic activity can provide valuable information, especially the interaction between different parts of the atmosphere and th…
Levi Graph AMR Parser using Heterogeneous Attention
Han He, Jinho D. Choi
Coupled with biaffine decoders, transformers have been effectively adapted to text-to-graph transduction and achieved state-of-the-art performance on AMR parsing. Many prior works,…
Dynamic disk-corona coupling during the state transition of Swift J1727.8-1613
Han He, Yi Long, Bei You +4
State transitions during outbursts of black hole X-ray binaries exhibit complex, rapidly evolving disk-corona coupling. Understanding this dynamic phase is essential for decipherin…
Unleashing the True Potential of Sequence-to-Sequence Models for Sequence Tagging and Structure Parsing
Han He, Jinho D. Choi
Sequence-to-Sequence (S2S) models have achieved remarkable success on various text generation tasks. However, learning complex structures with S2S models remains challenging as ext…
CriSPO: Multi-Aspect Critique-Suggestion-guided Automatic Prompt Optimization for Text Generation
Han He, Qianchu Liu, Lei Xu +4
Existing automatic prompt engineering methods are typically designed for discriminative tasks, where new task prompts are iteratively refined with limited feedback from a single me…
The Trust Paradox in LLM-Based Multi-Agent Systems: When Collaboration Becomes a Security Vulnerability
Zijie Xu, Minfeng Qi, Shiqing Wu +4
Multi-agent systems powered by large language models are advancing rapidly, yet the tension between mutual trust and security remains underexplored. We introduce and empirically va…
Widely Interpretable Semantic Representation: Frameless Meaning Representation for Broader Applicability
Lydia Feng, Gregor Williamson, Han He +1
This paper presents a novel semantic representation, WISeR, that overcomes challenges for Abstract Meaning Representation (AMR). Despite its strengths, AMR is not easily applied to…
Broadening and redward asymmetry of H line profiles observed by LAMOST during a stellar flare on an M-type star
Yuchuan Wu, Hechao Chen, Hui Tian +6
Stellar flares are characterized by sudden enhancement of electromagnetic radiation in stellar atmospheres. So far much of our understanding of stellar flares comes from photometri…
Establishing Strong Baselines for the New Decade: Sequence Tagging, Syntactic and Semantic Parsing with BERT
Han He, Jinho D. Choi
This paper presents new state-of-the-art models for three tasks, part-of-speech tagging, syntactic parsing, and semantic parsing, using the cutting-edge contextualized embedding fr…
Magnetically Arrested Discs Powering Jets in a Large Sample of Low-Accretion FR I Radio Galaxies
Huibo Fei, Han He, Bei You +4
We study a sample of 289 Fanaroff-Riley type I (FR I) radio galaxies selected from the LOFAR Two-Metre Sky Survey (LoTSS) DR1, identified by their edge-darkened radio morphologies.…
Handwritten Character Recognition from Wearable Passive RFID
Leevi Raivio, Han He, Johanna Virkki +1
In this paper we study the recognition of handwritten characters from data captured by a novel wearable electro-textile sensor panel. The data is collected sequentially, such that…
Radiation Pressure Instability in the "turn-on" Changing-Look AGN SDSS J1430+2303
Han He, Bei You, Marzena Åniegowska +1
We present a multi-wavelength study of the changing-look AGN SDSS J1430+2303. The optical flux increased by an order of magnitude over four years, driving a spectral transition fro…
Ten-year Survival Prediction for Breast Cancer Patients
Changmao Li, Han He, Yunze Hao +1
This report assesses different machine learning approaches to 10-year survival prediction of breast cancer patients.
DFEE: Interactive DataFlow Execution and Evaluation Kit
Han He, Song Feng, Daniele Bonadiman +2
DataFlow has been emerging as a new paradigm for building task-oriented chatbots due to its expressive semantic representations of the dialogue tasks. Despite the availability of a…
Effective Neural Solution for Multi-Criteria Word Segmentation
Han He, Lei Wu, Hua Yan +3
We present a simple yet elegant solution to train a single joint model on multi-criteria corpora for Chinese Word Segmentation (CWS). Our novel design requires no private layers in…
Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey: II. the bolometric and photospheric calibration
Weitao Zhang, Jun Zhang, Han He +2
The dependence of stellar magnetic activity on stellar parameters would be inspired by the chromospheric activity studies based on the large-scale spectroscopic surveys. The Ca II…
chromospheric activity of F-, G-, and K-type stars observed by the LAMOST Medium-Resolution Spectroscopic Survey
Han He, Weitao Zhang, Haotong Zhang +3
The distribution of stellar chromospheric activity with respect to stellar atmospheric parameters (effective temperature , surface gravity ,…
Variations of the 3-D coronal magnetic field associated with the X3.4-class solar flare event of AR 10930
Han He, Huaning Wang, Yihua Yan +2
The variations of the 3-D coronal magnetic fields associated with the X3.4-class flare of active region 10930 are studied in this paper. The coronal magnetic field data are reconst…
Activity Analyses for Solar-Type Stars Observed With Kepler. I. Proxies of Magnetic Activity
Han He, Huaning Wang, Duo Yun
Light curves of solar-type stars often show gradual fluctuations due to rotational modulation by magnetic features (starspots and faculae) on stellar surfaces. Two quantitative mea…
Temporal evolution of quasi-periodic oscillations in an accreting black hole Swift J1727.8-1613: coevolution of the disk-corona during the state transition
Sai-En Xu, Bei You, Yi Long +1
Low-frequency quasi-periodic oscillations (QPOs) are commonly observed in black hole X-ray binaries, and their frequency has been found to correlate with various spectral propertie…
Activity Analyses for Solar-type Stars Observed with Kepler. II. Magnetic Feature Versus Flare Activity
Han He, Huaning Wang, Mei Zhang +3
The light curves of solar-type stars present both periodic fluctuation and flare spikes. The gradual periodic fluctuation is interpreted as the rotational modulation of magnetic fe…
Magnetically arrested disks in FR I radio galaxies
Han He, Bei You, Ning Jiang +5
A sample of 17 FR I radio galaxies constructed from the 3CR catalog, which is characterized by edge-darkened radio structures, is studied. The optical core luminosities derived fro…
Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey
Weitao Zhang, Jun Zhang, Han He +3
$\require{mediawiki-texvc}$A stellar chromospheric activity database of solar-like stars is constructed based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMO…
Variability of H chromospheric activity of solar-like stars revealed by the time-domain data of LAMOST Medium-Resolution Spectroscopic Survey
Han He, Ali Luo, Haotong Zhang +1
The variability of H chromospheric activity of solar-like stars is investigated by using the time-domain data of LAMOST Medium-Resolution Spectroscopic Survey (MRS). We use $R_…
The soft X-ray transient EP241021a: A cosmic explosion with a complex off-axis jet and cocoon from a massive progenitor
Giulia Gianfagna, Luigi Piro, Gabriele Bruni +22
X-ray flashes (XRFs) are fast X-ray transients thought to be softer analogs of gamma-ray bursts (GRBs). With its soft X-ray sensitivity, the Einstein Probe (EP) provides a unique o…
On the optical emission in the mini-outburst of the black hole X-ray binary MAXI J1348-630
Xiao Fan, Bei You, Dizhan Du +2
We investigate the optical emission of the black hole X-ray binary MAXI J1348-630 during its 2019 minioutburst. Using optical data from the Las Cumbres Observatory Global Telescope…
Stealthy Jailbreak Attacks on Large Language Models via Benign Data Mirroring
Honglin Mu, Han He, Yuxin Zhou +9
Large language model (LLM) safety is a critical issue, with numerous studies employing red team testing to enhance model security. Among these, jailbreak methods explore potential…
Actions for Vacuum Einstein's Equation with a Killing Symmetry
Han He, Yongge Ma, Xuejun Yang
In a space-time with a Killing vector field which is either everywhere timelike or everywhere spacelike, the collection of all trajectories of gives a 3-dimension…