Talks and Presentations

Dive Into QAR Stream Data - A Real-time Early Warning Mechanism

August 12, 2023

Talk, 2023 7th International Conference on Big Data and Internet of Things (BDIoT'23), Beijing, China

This is a research report on real-time flight safety early warning using QAR stream data. QAR is a quick access recorder that records various sensor data of the aircraft. The authors propose a data washing method, a data acquisition method, and a random forest classification model to predict potential over-limit events during the flight. The authors also present a real-world heavy landing case, analyzing the causes and effects of the over-limit event. The authors finally discuss the future work directions and contribution summary.

Hyper-Realistic MetaHuman - The Bridge to the Metaverse in Web 3.0

March 10, 2023

Talk, High-tech Innovation Labortory, North China University of Techonology, Beijing, China

This talk focus on the generation of metahuman prototype - 3D reconstruction based on Alicevision(A photogrammetric computer vision framework by C/C++), Meshroom(A GUI-based 3D reconstruction software by using Alicevision framework) and meshroom_CLI(An open-source repository to control the phtogrammetry software Meshroom without its GUI using Python script).

Tutorial of C Programming Language: Before Fall 2022 Final Exam

December 01, 2022

Tutorial, School of Information, North China University of Techonology, Beijing, China

This tutorial aims to elucidate commonly misunderstood aspects of fundamental C programming concepts, with the objective of enabling the audience to attain a superior performance on their final assessment of 2022 fall. The content of this tutorial is based on my favourite C programming book - ‘The Drops of C Programming Language‘(ISBN: 9787115321985) by Yan Zhao, which is a highly recommended read for beginners in C programming.

An Overview of Image Steganography

November 05, 2022

Talks, Department of Information Security, North China University of Techonology, Beijing, China

This presentation gives an overview of image steganography, a technique for hiding information in images. It introduces the trend of combining machine learning and image processing, and some applications of digital image processing such as face recognition, iris recognition, and activity recognition. It then reviews some existing methods for information hiding in images, such as digital watermarking, visual cryptography, and LSB replacement. It also proposes a novel system that combines cryptography and image steganography for secure data transmission. The system consists of four phases: encryption using AES algorithm, embedding using LSB replacement, hiding using Kekre’s median codebook generation algorithm, and stitching using K-nearest neighbor algorithm. The presentation concludes by highlighting the advantages and potential applications of the proposed system in fields such as banking, consultancies, and detective agencies.

A Simple Introduction to Spectrum Map

November 04, 2022

Talks, Department of Information Security, North China University of Techonology, Beijing, China

This presentation is a simple introduction to spectrum map, which is a way to represent images based on spatial frequencies of grey value or colour variations over the image plane. The presentation explains the concepts of Fourier series and Fourier transform, which are used to convert spatial functions into spatial spectra, and shows some examples of amplitude and phase spectra of different images. The presentation also demonstrates how different frequency components affect the image reconstruction and quality. The presentation aims to help the audience understand the basics of spatial spectrum and its applications in digital image processing.

Tutorial of C Programming Language: Before Fall 2021 Final Exam

December 14, 2021

Tutorial, School of Information, North China University of Techonology, Beijing, China

This tutorial aims to elucidate commonly misunderstood aspects of fundamental C programming concepts, with the objective of enabling the audience to attain a superior performance on their final assessment of 2021 fall. The content of this tutorial is based on my favourite C programming book - ‘The Drops of C Programming Language‘(ISBN: 9787115321985) by Yan Zhao, which is a highly recommended read for beginners in C programming.

Tutorial of C Programming Language: Before Fall 2020 Final Exam

December 16, 2020

Tutorial, Department of Information Security, North China University of Techonology, Beijing, China

This tutorial aims to elucidate commonly misunderstood aspects of fundamental C programming concepts, with the objective of enabling the audience to attain a superior performance on their final assessment of 2020 fall. The content of this tutorial is based on my favourite C programming book - ‘The Drops of C Programming Language‘(ISBN: 9787115321985) by Yan Zhao, which is a highly recommended read for beginners in C programming.

Tianhao Li