Research Scholars 2025-2026

2025-2026 Research Scholars

Autumn Quad Research Scholars

Supported by the Global Health Research Fund

  • Emmanuel Barajas, Fourth-Year, Psychology, Comparative Human Development
    • Project Title: Reframing Help-Seeking: The Promise of Public Recognition in Motivating Boys to Seek Help
    • Mentor: Lin Bian
  • Hunter Bershtein, Fourth-Year, Biological Sciences, Economics
    • Project Title: The Therapeutic Potential of CD16hi Macrophages in Atherosclerosis Resolution
    • Mentor: Ada Weinstock
  • Sabrina Chang, Second-Year, Biology, Data Science
    • Project Title: Characterizing the effects of smoking on age-associated DNA methylation
    • Mentor: Brandon Pierce
  • Vivian Chang, Third-Year, Neuroscience, Biological Sciences
    • Project Title: Longitudinal Structural MRI Signatures of Resistance and Resilience in SuperAging
    • Mentor: Adam Martersteck
  • Ephraim Craddock, Third-Year, Molecular Engineering
    • Project Title: An IL-2-TGF-β Fusion Protein Expands Tregs and Induces Tolerance of Transplants
    • Mentor: Maria-Luisa Alegre
  • Emilio Del Angel, Third-Year, Neuroscience
    • Project Title: Assessing the Effect of Weight Cycling on Neutrophil Recruitment and Development
    • Mentor: Ada Weinstock
  • Ahtziri Fernandez, Third-Year, Neuroscience, Spanish
    • Project Title: Identifying the sex-specific roles of the gut microbiome-brain axis in aged Alzheimer’s Disease APPPS1-21 and NLF/PS1 (M146V) knock-in Mouse Models
    • Mentor: Piyali Saha
  • Bella Hobaugh, Fourth-Year, Neuroscience, Philosophy
    • Project Title: Empathy and the Doctor-Patient Relationship
    • Mentor: Peggy Mason
  • Jeffrey Ke, Fourth-Year, Psychology
    • Project Title: Long term effects of IFN-β therapy in Multiple Sclerosis
    • Mentor: Anthony Reder
  • Layne Kohler, Fourth-Year, Biological Sciences
    • Project Title: Weight Cycling Effect on Female Reproductive Function
    • Mentor: Ada Weinstock
  • Alison Lafayette, Third-Year, Biological Sciences
    • Project Title: Extracellular Vesicle RNA as Biomarkers of Glycocalyx Injury and Graft Dysfunction in Liver Transplantation
    • Mentor: Kentaro Noda
  • Diya Mishra, Fourth-Year, Biological Sciences
    • Project Title: Designing Case-Control Studies to Assess Road Traffic Injury Risks in India
    • Mentor: Kavi Bhalla
  • Rishi Purayil, Third-Year, Statistics
    • Project Title: Analysing Transparency of Conflict-of-Interest Disclosures by Trauma Surgery Researchers
    • Mentor: Timothy Plackett
  • Nicole Reed, Fourth-Year, Biology, CEGU
    • Project Title: Tractor Rollovers and Road Safety in India
    • Mentor: Kavi Bhalla
  • Sophia Sasaki, Fourth-Year, Biological Sciences
    • Project Title: Spontaneous breathing and diaphragm protection in mechanically ventilated patients
    • Mentor:  Bhakti Patel 
  • Hannah Thier, Fourth-Year, Biology, HIPS
    • Project Title: Impact of Physician Anti-Bias Intervention on Care Satisfaction for Patients with Sickle Cell Disease
    • Mentor: Austin Wesevich
  • Akanksha Varanasi, Third-Year, Molecular Engineering
    • Project Title: Gene Expression and Immune Mechanism Profiles of Interferon-Treated Multiple Sclerosis Patients Across Subtypes
    • Mentor: Anthony Reder
  • Jazmine Vitela, Second-Year, Biological Sciences
    • Project Title: Impact of color tint maps on regions of interest for radiomic feature extraction in ultrasound images
    • Mentor: Heather Whitney
  • Luna Wang, Second-Year, Biological Sciences
    • Project Title: Impact of Alteration of the Microbiome During Critical Illness on Long-term Clinical Outcomes
    • Mentor: Krysta Wolfe
  • Alexandra Zhou, Third-Year, Economics, Applied Mathematics
    • Project Title: Proximate Causes of the Global Fertility Decline
    • Mentor: Anup Malani

Supported by the Hoeft Family Research Fund

  • Sammy Alderden, Second-Year, Molecular Engineering, Chemistry
    • Project Title: Testing the Permeability and Conductivity of Cationic Mesoporous Membranes
    • Mentor: Shrayesh Patel
  • Maya Atassi, Third-Year, Astrophysics, Physics
    • Project Title: Calibrating the Cosmos: Precision Polarization for the Simons Observatory
    • Mentor: Jeff McMahon
  • Jeff Baek, Third-Year, Biological Sciences
    • Project Title: The investigation of the expression pattern of BMP9, Smad 1/5/8, and Runx2 in mouse cranial suture development via hybridization chain reaction
    • Mentor: Russell Reid
  • Mia Bocian, Third-Year, Psychology, Economics
    • Project Title: The Autonomic Ear: Auditory feedback controls autonomic regulation
    • Mentor: Howard Nusbaum
  • Carmen Cox, Third-Year, Biological Sciences
    • Project Title: Assessing the Anatomy and Function of Fish Pectoral Fins
    • Mentor: Mark Westneat
  • Clarissa Ding, Third-Year, Neuroscience
    • Project Title: Effects of SNF2H Residue Character on RNA Binding Interactions
    • Mentor: Alexander J. Ruthenburg
  • Shelley Fernando, Third-Year, Biochemistry, Biology, Chemistry
    • Project Title: Dissecting the Role of the JK3 Locus in Immunity
    • Mentor: Marcus Clark
  • Rafael Gutierrez, Fourth-Year, Neuroscience
    • Project Title: Examining the role of ventral muscles in larval fly movement
    • Mentor: Elizabeth Heckscher
  • Luis Hernandez, Third-Year, Biological Sciences
    • Project Title: Mitochondrial Transfer between Cancer Cells and Neutrophils
    • Mentor: Yuxuan (Phoenix) Miao
  • Alex Hu, Third-Year, Fundamentals, Germanic Studies
    • Project Title: The Political Novel Today: Problems and Possibilities
    • Mentor: Sophie Salvo
  • Sayana Isaac, Third-Year, Economics, South Asian Civilizations
    • Project Title: The Role of IL6-ST on Cancer-Associated Fibroblast Inflammation and Cell State Transitions
    • Mentor: Simon Schwörer
  • Badis Labbedi, Second-Year, Physics, Mathematics
    • Project Title: Axion Dark Matter Field Correlations via Entangled Photon Cavities
    • Mentor: LianTao Wang
  • Elena Lill, Second-Year, Biological Chemistry, Business Economics
    • Project Title: Recombination Mechanism for SCCmec
    • Mentor: Phoebe Rice
  • Desanka Malinovic, Second-Year, Political Science
    • Project Title: ‘Po naški’ Through Fiction: A Structured Reader of Bosnian, Croatian, Montenegrin, and Serbian Prose
    • Mentor: Nada Petkovic
  • Julia Mastracci, Fourth-Year, Biological Chemistry, Biological Sciences
    • Project Title: Investigating the Function of Individual and Combined TetraThymosinβ Domains
    • Mentor: David Kovar
  • Nicole Millan Ortiz, Fourth-Year, English Language and Literature, Romance Languages and Literature / Gender and Sexuality Studies
    • Project Title: Postwar Artists' Books: An Investigation into the Curiosities of the Book Form
    • Mentor: Christine Mehring
  • Gaby Morin, Third-Year, Molecular Engineering
    • Project Title: High-Throughput Development of Redox-Active Polymers as Electrodes for Organic Batteries 
    • Mentor: Stuart Rowan
  • Gabe Nelson, Third-Year, Biology, Chemistry
    • Project Title: Biomechanical Modeling of Feeding Mechanisms in the Marine Butterflyfishes, Family Chaetodontidae
    • Mentor: Mark Westneat
  • Michael Qiu, Third-Year, Biological Sciences
    • Project Title: Elucidating the Roles of U4 sRNA structures in 5’ Splice Site Selection of pre-mRNA Splicing and Neurodevelopmental Disorder 
    • Mentor: Jonathan Prescott Staley
  • Ismael Robles-Razzaq, Third-Year, Statistics, Computer Science
    • Project Title: The Geometry of Representations in Mouse Latent-Context Decision-Making
    • Mentor: Ramon Nogueira Manas
  • Eva Schultz, Third-Year, Astronomy and Astrophysics, Visual Arts
    • Project Title: Development of an Integrating Sphere as a Thermal Calibration Source for Cosmic Microwave Background Observations
    • Mentor: Jeffrey McMahon
  • Rebecca Sias, Third-Year, Biological Chemistry, Chemistry
    • Project Title: Investigating Cytokine-Specific eQTMs in Airway Smooth Muscle Cells
    • Mentor: Carole Ober
  • Victoria Sullivan, Fourth-Year, Biological Sciences
    • Project Title: Investigating the Spatial Regulation of Kibra by Apical Polarity Protein Interactions in Epithelial Cells
    • Mentor: Richard Fehon

Supported by the Kemper Foundation 

  • Yorik Chuang, Second-Year, Economics, Public Policy Studies
    • Project Title: A Century of Accounting Ideas:  Quantifying Impacts of Standard-Setters on Innovation in Accounting Practices
    • Mentor: Anthony Le
  • Paolo Diaz Andrade, Third-Year, Sociology, Cinema and Media Studies
    • Project Title: Latin-American Elites’ Perspectives on Poverty and Inequality: A Mixed-Methods Approach
    • Mentor: Pilar Manzi
  • Nathaniel Kim, Third-Year, Computer Science, Media Arts and Design
    • Project Title: Using LLMs to Model the Strength of Non-English Passwords
    • Mentor: Blase Ur
  • Spencer May, Fourth-Year, Mathematics, Physics
    • Project Title: Regression Discontinuity Design Methodology Improvement
    • Mentor: Nikolaos Ignatiadis
  • Jacob Neplokh, Fourth-Year, Fundamentals: Issues and Texts
    • Project Title: Leadership and Democracy
    • Mentor: John P. McCormick
  • Antonio Persi, Second-Year, Anthropology, Political Science
    • Project Title: Violence, Authority, and Aid: Rethinking State-Building in Contemporary Haiti
    • Mentor: Martin Castillo-Quintanna
  • Allison Row, Third-Year, Statistics, Economics
    • Project Title: How Artificial Intelligence Agents Interpret Subjective Human Values: An Audit of Personalization in Large Language Models
    • Mentor: Blase Ur
  • Noah Sher, Second-Year, Sociology
    • Project Title: Entangled Oligarchies: The Hidden Deals Reshaping US-China Power Relations in Offshore Financial Centers
    • Mentor: Kimberly Kay Hoang
  • Isabella Summe, Fourth-Year, Data Science
    • Project Title: Neural Signatures of Human and LLM-Derived Surprise in Story Listening
    • Mentor: Monica Rosenberg
  • Shreya Thota, Third-Year, Economics, Computer Science
    • Project Title: Language Background And Infants' Attention Toward Native And Foreign Language Speakers
    • Mentor: Yiyi Wang

Supported by the Liew Family Research Fund

  • Henry Baldwin, Fourth-Year, Environment, Geography, & Urbanization
    • Project Title: In Human Scale: The Search for Ecological Proportion in Nineteenth-Century Literature
    • Mentor: Benjamin Morgan
  • Rohan Buluswar, Fourth-Year, Mathematics
    • Project Title: Physics in Generative Diffusion Models
    • Mentor: Lorenzo Orecchia
  • Onofrio De Michele, Fourth-Year, Anthropology
    • Project Title: Displaying Disappearing WIldlife: The Field Museum 1896 Expedition and Taxidermy in the 21st century
    • Mentor: Jessica Landau
  • Sebastian Deery, Fourth-Year, Mathematics, Computer Science
    • Project Title: Projected Score Matching for Generative Modeling and Inverse Problems in Chaotic Systems
    • Mentor: Nisha Chandramoorthy
  • Cleo Delogu, Fourth-Year, Gender and Sexuality Studies, Cinema and Media Studies
    • Project Title: “Kidnapped”: Capital, Migration and Childhood in Comparative Print Culture 1820-1870
    • Mentor: Josephine McDonagh
  • Sofya Fadeeva, Second-Year, Astronomy and Astrophysics
    • Project Title: Measuring Changes in Astronomical Sources over a Timescale of a Century
    • Mentor: Richard Kron
  • Lydia Gafford, Third-Year, Art History, History
    • Project Title: The Craft Chronicle
    • Mentor: Erica Warren
  • Jaehyeon Han, Third-Year, History, Germanic Studies
    • Project Title: The Political Novel Today: Problems and Possibilities
    • Mentor: Sophie Salvo
  • Daniel Hernandez, Second-Year, Computer Science
    • Project Title: Interpretable Latent Structure of an AI Emulator of Stochastic Sudden Stratospheric Warmings
    • Mentor: Dorian Abbot
  • Emma  Kirwin, Third-Year, Creative Writing, Cinema and Media Studies
    • Project Title: Environmental Futures Through Critical Game Design
    • Mentor: Katherine Buse 
  • Larry Li, Third-Year, Physics
    • Project Title: Measuring the Relative Branching Ratio of KL-> 3pi0 / KL->pi+pi-pi0
    • Mentor: Yau Wah
  • Elektra Makris, Fourth-Year, Chemistry, Biological Chemistry
    • Project Title: High Throughput Validation of de novo Protein Binders to Probe Mechanisms of Inner-Ear Mechanotransduction
    • Mentor: Marcos Sotomayor 
  • Giovanni Maya, Fourth-Year, Computer Science, Data Science
    • Project: Voice vs. Visual Interfaces for Robot Personalization: Evaluating Control and Transparency Tradeoffs
    • Mentor: Sarah Sebo
  • Viresh Mittal, Third-Year, Computer Science, Economics
    • Project Title: Quicksilver
    • Mentor: Ben Y. Zhao
  • Eliana Schiller, Third-Year, Astrophysics, Anthropology
    • Project Title: Characterizing the Baryon Cycle Around Galaxies via Integral Field Spectroscopy
    • Mentor: Hsiao-Wen Chen
  • Junfei Sun, Fourth-Year, Mathematics, Computer Science
    • Project: Asynchronous heavy-tailed Optimization
    • Mentor: Tian Li
  • Richmond Yeung, Fourth-Year, Physics
    • Project Title: Design and Development of PSEC5b and PSEC6: A Waveform sampler for  fast-timing detectors in Particle Accelerators, Medical Imaging and  Astrophysics
    • Mentor: Henry Frisch
  • Aine Zhang, Second-Year, Statistics, Sociology
    • Project Title: Degrowth as a Game Design Problem
    • Mentor: Katherine Buse

Supported by the NK Cheung Chemistry Research Fellowship

  • Michael Bolgov, Third-Year, Molecular Engineering
    • Project Title: Multiple turnovers of RNA methylation by methyltransferase ribozymes
    • Mentor: Matthew Tirrell
  • John Brownridge, Third-Year, Molecular Engineering, Religious Studies
    • Project Title: Mechanically-Initiated Polymerization Mediated by Piezochemistry for Bone Repairing
    • Mentor: Yixiao Dong
  • Felice Chan, Fourth-Year, Chemistry
    • Project Title: Modeling Fluorescent Proteins as Living Qubits
    • Mentor: Greg Engel
  • Azeem Currah, Third-Year, Chemistry
    • Project Title: A Use Case for Ni3THT2 as a Heavy-Metal Sensor
    • Mentor: John Anderson
  • Josh Gonzalez, Third-Year, Biological Chemistry
    • Project Title: Determination of the Functional Composition of Volume-Regulated Anion Channels During CD4+ Cell-Mediated Immune Response
    • Mentor: Axel Concepcion
  • Phoebe Hsu, Second-Year, Chemistry
    • Project Title: Regulation of RNA targets by the tRNA splicing endonuclease (TSEN) complex
    • Mentor: Cassandra Hayne
  • Arnav Modak, Second-Year, Chemistry, Economics
    • Project Title: Spin-valley Control of Monolayer MoS2 via Molecular Functionalization
    • Mentor: Sarah B. King
  • Samarth Ram, Third-Year, Chemistry
    • Project Title: Leveraging Machine Learning to Predict IscB-mediated Genome Editing 
    • Mentor: Weixin Tang 
  • Marco Sanchez, Third-Year, Molecular Engineering
    • Project Title: Multiple Turnovers in Non-Enzymatic RNA Replication at the Origin of Life
    • Mentor: Jack Szostak
  • Juliette Shapiro, Third-Year, Chemistry
    • Project Title: Efforts Towards the Synthesis of Dhilirolide A
    • Mentor: Scott Snyder
  • Richard Song, Third-Year, Biological Sciences, Biological Chemistry
    • Project Title: Characterization of Actin Cytoskeleton Changes by Pharmacological Inhibitors of Volume-Regulated Anion Channels
    • Mentor: Axel Concepcion
  • Ashok Tate, Third-Year, Chemistry
    • Project Title: Self-Tethering Viologens for Facile and Durable H2O2 Electrosynthesis
    • Mentor: Anna Wuttig
  • Della Waldman, Third-Year, Biological Chemistry
    • Project Title: Reconstituting Actin Stress Fiber Repair Through Protein Phase Separation
    • Mentor: Margaret Gardel
  • Jeffery Zhang, Third-Year, Biological Chemistry
    • Project Title: Characterizing environmentally responsive condensing proteins in Synechococcus elongatus in vitro
    • Mentor: D. Allan Drummond

Supported by Collegiate Research Funds and other generous gifts from donors

  • Jacques Attinger, Second-Year, Physics, Mathematics
    • Project Title: Printing Superconducting Quantum Circuits using a Miniaturized Molecular Beam Epitaxy
    • Mentor: Shuolong Yang
  • Naomi Gelfer, Second-Year, Molecular Engineering
    • Project Title: Investigating the pH Dependence of Fluorescent Protein Qubits for Cellular Biosensing
    • Mentor: Peter Maurer
  • Colleen Kim, Third-Year, Molecular Engineering
    • Project Title: Nb Thin Film Growth Optimization
    • Mentor: Supratik Guha
  • Siqi Liu, Fourth-Year, Physics, Applied Mathematics
    • Project Title: 2D Au
    • Mentor: Chong Liu
  • Ramon Rivas Varela, Fourth-Year, Physics, Mathematics
    • Project Title: Enhancing Quantum Thermometry in Living Cells Using Robust ZFS Extraction Methods
    • Mentor: Peter Maurer
  • Ha Do, Fourth-Year, Astrophysics, Race, Diaspora, & Indigeneity
    • Project Title: A chemical investigation of Milky Way stellar streams
    • Mentor: Alexander Ji
  • Zvi Gomez Fisher, Second-Year, Linguistics, Public Policy
    • Project Title: A Descriptive Phonology of Anabar Dolgan
    • Mentor: Lenore Grenoble
  • Avivit Ashman, Third-Year, Art History
    • Project Title: Art of the Munich Olympics
    • Mentor: Christine Mehring
  • Iris Badezet-Delory, Third-Year, Physics, Classical Studies
    • Project Title: Weather Gridlock: The Dynamics of Back-to-Back Heatwaves in Climate Hot-Spots
    • Mentor: Noboru Nakamura
  • Aubrey Barb, Third-Year, Biochemistry, Chemistry
    • Project Title: Hybrid Proline-Rich Proteins in Systems of Plant Immunity
    • Mentor: Jean Greenberg
  • Jace Chen, Second-Year, Molecular Engineering, Economics
    • Project Title: Identifying targetable vulnerabilities in extrachromosomal DNA–positive cancers.
    • Mentor: Lixing Yang
  • Charlie Davis, Fourth-Year, Neuroscience
    • Project Title: In-silico Deployment of Thoracic Aortic Stents to Model Thoracic Aortic Aneurysm Disease Progression 
    • Mentor: Luka Pocivavsek
  • Nurai El Ashry, Third-Year, Biochemistry, Neuroscience
    • Project Title: Optimization of FISH and IF Protocols in FFPE Tissue
    • Mentor: Jingyi Fei
  • Alex Garcia, Fourth-Year, Molecular Engineering
    • Project Title: Investigation of the effect of separator on the performance of low temperature molten salt electrolytes in lithium metal batteries
    • Mentor: Chibueze Amanchukwu
  • Geordan Haynes, Fourth-Year, Psychology
    • Project Title: Caregiver Responsiveness Project
    • Mentor: Susan Goldin-Meadow
  • Kalea Hidalgo, Third-Year, Neuroscience, Psychology
    • Project Title: PIE-Sequencing ATXN2, the RNA-Binding Protein
    • Mentor: Paschalis Kratsios
  • Nathan Hu, Third-Year, Chemistry, Statistics
    • Project Title: Fabrication of Electrically Tuneable Pressure-Sensitive LCE Adhesive Materials System
    • Mentor: Stuart Rowan
  • Mia Karathanasis, Third-Year, Linguistics, Middle Eastern Studies
    • Project Title: Individual Variability in Perceptual Assimilation: The Relationship Between Spanish Perception and English Production
    • Mentor: Melissa Baese-Berk
  • Ernest Leong, Fourth-Year, Romance Languages & Literatures: French
    • Project Title: Translating Charles Perrault's "Le Parralèle des Anciens et des Modernes" 
    • Mentor: Larry F. Norman
  • Isaac Loh, Third-Year, Biology, Economics
    • Project Title: Catfish Staging for Odontode Research
    • Mentor: Neil H. Shubin
  • Matheus Martino-Wojciechowski, Third-Year, Neuroscience, History
    • Project Title: Thoracic Aortic Disease Modeling
    • Mentor: Luka Pocivavsek
  • Marina Mendes Ferreira, Second-Year, Biological Sciences, History, Philosophy, and Social Studies of Science and Medicine (HIPS)
    • Project Title: Disarming plant defenses: spatial expression of detoxification genes in Pieris rapae
    • Mentor: Marcus Kronforst
  • Gabby Moon, Third-Year, Biological Sciences
    • Project Title: How Does BNIP3 Deletion Impact Skeletal Muscle?
    • Mentor: Kay Macleod
  • Deqa Muse, Fourth-Year, Chemistry, History, Philosophy, and Social Studies of Science and Medicine
    • Project Title: Modeling Conical Structures and Surgical Geometries
    • Mentor: Nhung Nguyen
  • Kyle Obermeyer, Third-Year, Neuroscience
    • Project Title: Inflammation and Disease Progression in a Genetic Mouse Model of Prion Disease
    • Mentor: James Mastrianni
  • Nic Restivo, Third-Year, Geophysical Sciences, Environmental Sciences & Chemistry
    • Project Title: Calibrating Biomarker Proxies for Fires in Savannas
    • Mentor: Tyler Karp
  • Hanna Ruiz, Third-Year, Biological Chemistry, Economics
    • Project Title: The Dosage-Dependent Effect of Interferons on CD28 and 4-1BB CAR T-cells
    • Mentor: Jun Huang
  • Sara Selig, Second-Year, Computer Science, Biological Sciences
    • Project Title: Sensorimotor cortical activity and perceptual detection of intracortical microstimulation in somatosensory cortex
    • Mentor: Nicholas Hatsopoulos
  • Noah Sodickson, Second-Year, Physics, Mathematics
    • Project Title: An Information-Theoretic Approach to Spatial Transcriptomics Analysis
    • Mentor: Vincenzo Vitelli
  • Evalds Viguls, Second-Year, Biochemistry, Biological Sciences
    • Project Title: Epigenetic Regulation of DNA Double-Strand Break Repair
    • Mentor: Stephen J. Kron
  • Elijah Wakefield, Third-Year, Mathematics, Chemistry
    • Project Title: Scent Mixture Discrimination
    • Mentor: Leslie Kay
  • Stacey Zhao, Third-Year, Biological Sciences, Molecular Engineering
    • Project Title: Dissecting the Immune Crosstalk Driving tSC-Dependent Tumor Relapse
    • Mentor: Yuxuan (Phoenix) Miao
  • Ahan Datta, Third-Year, Physics, Mathematics
    • Project Title: Design of PSEC6: An Application Specific Integrated Circuit for Picosecond Timing
    • Mentor: Henry Frisch
  • Benedikt Nagele, Fourth-Year, Molecular Engineering, Chemistry
    • Project Title: Exploring Mechanisms of Resistance to Trastuzumab Deruxtecan in Endometrial cancers
    • Mentor: Sridevi Challa
  • Andrew Arzac, Third-Year, Molecular Engineering, Phyiscs, Mathematics
    • Project Title: PSEC6
    • Mentor: Henry Frisch
  • Graydon Schulze-Kalt, Fourth-Year, Physics
    • Project Title: PULSE-A Electronics Design, Integration, and Test
    • Mentor: Tian Zhong