Posts by Collection

Birdwatching

Selected Poems

English poems

Pixel-Style Graphic PC Game

Overview (1 min) | Participant. Oct 2019 ~ Jun 2020

Utilized C++ to implement features for character navigation, combat, item selection, map loading and NPC iteraction.

RoboGame2020 Competition

Overview (1 min) | Participant. Jun 2020 ~ Oct 2020

Collaborated in designing and programming a robot with STM32 embedded systems for moving simulated patients to designated beds; programmed and controlled the robotic arm for task execution. Achieved Fourth Place in the second round of the competition.

ISC21 International Supercomputing Competition

Overview (1 min) | Participant. Oct 2020 ~ Jun 2021

Enhanced a Fortran-based weather forecasting model (WRF) by optimizing compilation flags and parallelization strategies. Ranked 1st on the WRF application and 6th overall among 13 finalist teams in the competition.

VSCode-Azure DevOps Integration Extension

Overview (1 min) | Team leader. Sep 2022 ~ Dec 2022

Led the design and development of a Visual Studio Code extension enabling pull request (PR) workflows with Azure DevOps.

ASC22-23 International Supercomputing Competition

Overview (1 min) | Team leader. Jan 2022 ~ May 2023

Led a team to optimize various applications, including numerical simulation and large language models (LLMs). Awarded 2nd Place among 300 teams worldwide.

Joint Optimization of Handoff and Video Rate in LEO Satellite Networks

Overview (1 min) | Paper
Authors: Kyoungjun Park, Zhiyuan He, Cheng Luo, Yi Xu^*, Lili Qiu, Changhan Ge, Muhammad Muaz, Yuqing Yang

We propose and evaluate new algorithms for video-aware mobility management in satellite networks, jointly optimizing satellite handoff and video bitrate to improve streaming experience for both single and multiple users.

Replica Server Placement in a Satellite Network

Overview (1 min) | Paper | Slides
Authors: Zhiyuan He, Yi Xu^*, Cheng Luo, Lili Qiu, Yuqing Yang

Satellites can be applied as content replica servers to improve client experience in the remote locations. We optimized the placement of servers in satellite networks to reduce transmission and storage costs while considering satellite movement.

Sublinear Algorithms for Estimating Single-Linkage Clustering Costs

Overview (1 min) | Paper | Slides
Authors: Pan Peng, Christian Sohler, Yi Xu^* (alphabetical order)

We proposed new cost functions about SLC, which reflects properties of datasets, and estimated our costs in sublinear time. We studied this problem in both distance and similarity measurements, and conducted extensive experiments to validate our results. We also proved the lower bounds, and our algorithms nearly match them.

Theory Student Day 2025

Overview (1 min) | Slides

Presented an in-depth overview of our work on sublinear algorithms for estimating SLC costs.

Women in Theory 2025 Rump Session

Overview (1 min) | Slides

Briefly presented recent work on sublinear algorithms for estimating SLC costs.

Design and Analysis of Algorithms

Teaching assistance, Master's course, USTC, 2024

This course mainly introduces the basics of Randomized Algorithms, Approximation Algorithms, and Distributed Algorithms, and the methods to analyze the efficiency and correctness of algorithms.

Algorithms for Big Data

Teaching assistance, Bachelor's course, USTC, 2025

This course is a theory-oriented course, and introduces modern algorithmic techniques for big data.