Chi Zhang

Career Trajectory Analysis of Information Technology Alumni

2016

Understanding alumni's career path is critical for an Information Technology (IT) program to engage existing students, get connected to alumni and adapt the curriculum to the ever-changing technology field. LinkedIn, the largest professional networking site, …

A “Look-Backward-and-Forward” Adaptation Strategy for Assessing Parameter Estimation Error of Human Motion Prediction Model

2022 · IEEE Robotics and Automation Letters

The prediction of human motion is essential for safe human-robot collaboration (HRC). For existing prediction methods based on adaptive neural network (NN) models, estimation errors (EEs) of model parameters are directly coupled with prior EEs …

Tree Representation, Growth Rate of Blockchain and Reward Allocation in Ethereum with Multiple Mining Pools

2022 · arXiv (Cornell University)

It is interesting but difficult and challenging to study Ethereum with multiple mining pools. One of the main difficulties comes from not only how to represent such a general tree with multiple block branches (or …

A Trusted Energy Data Sharing System Based on Blockchain

2022 · 2022 IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers (IPEC)

Sharing the statistic results of energy data on the blockchain has huge practical significance. However, the ability to store and analysis large data set is limited by the throughput of the blockchain. Introducing a data …

Defining Research and Teaching Priorities that Could be Advanced Through a Near-Surface Geophysics Center

2022

The National Science Foundation provided support to the American Geophysical Union (AGU) to engage its relevant community and help clarify the need for a Near-Surface Geophysics (NSG) Center and identify how it could advance key …

Feedback Particle Filter on Matrix Lie Groups

2015 · arXiv (Cornell University)

This paper is concerned with the problem of continuous-time nonlinear filtering for stochastic processes on a compact and connected matrix Lie group without boundary, e.g. SO(n) and SE(n), in the presence of real-valued observations. This …

DeepEMD: Differentiable Earth Mover's Distance for Few-Shot Learning

2022 · IEEE Transactions on Pattern Analysis and Machine Intelligence

In this work, we develop methods for few-shot image classification from a new perspective of optimal matching between image regions. We employ the Earth Mover's Distance (EMD) as a metric to compute a structural distance …

Two-Stage Constrained Actor-Critic for Short Video Recommendation

2023

The wide popularity of short videos on social media poses new opportunities and challenges to optimize recommender systems on the video-sharing platforms. Users sequentially interact with the system and provide complex and multi-faceted responses, including …

MotionChain: Conversational Motion Controllers via Multimodal Prompts

2024 · arXiv (Cornell University)

Recent advancements in language models have demonstrated their adeptness in conducting multi-turn dialogues and retaining conversational context. However, this proficiency remains largely unexplored in other multimodal generative models, particularly in human motion models. By integrating …

A Data Mining-based Method for Analyzing and Predicting the Cost of Power Grid Production and Technical Improvement Projects

2024

Due to the diversified characteristics of the factors affecting the cost of the project, the prediction results of the project often have a large error, therefore, we propose a study on the analysis and prediction …

SDB: Scalable Blockchain Database via Searchable Encryption and Cross-Shard Mechanism

2025

Blockchain database has been widely applied in various fields, providing a secure architecture for data storage and sharing. In blockchain databases, the use of sharding technology can enhance the system's scalability and improve the processing …

AI Flow: Perspectives, Scenarios, and Approaches

2025 · arXiv (Cornell University)

Pioneered by the foundational information theory by Claude Shannon and the visionary framework of machine intelligence by Alan Turing, the convergent evolution of information and communication technologies (IT/CT) has created an unbroken wave of connectivity …

External Large Foundation Model: How to Efficiently Serve Trillions of Parameters for Online Ads Recommendation

2025 · arXiv (Cornell University)

Ads recommendation is a prominent service of online advertising systems and has been actively studied. Recent studies indicate that scaling-up and advanced design of the recommendation model can bring significant performance improvement. However, with a …

Identity Deepfake Threats to Biometric Authentication Systems: Public and Expert Perspectives

2025 · arXiv (Cornell University)

Generative AI (Gen-AI) deepfakes pose a rapidly evolving threat to biometric authentication, yet a significant gap exists between expert understanding of these risks and public perception. This disconnection creates critical vulnerabilities in systems trusted by …

One Model to Serve All

2021

Traditional industry recommendation systems usually use data in a single domain to train models and then serve the domain. However, a large-scale commercial platform often contains multiple domains, and its recommendation system often needs to …