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JianguoDing
English

Think, explore, share.

Notes on technology, products, hands-on work and the world around me. Some become articles; others become things you can explore for yourself.

Start with an article

02 / ARTICLES & THOUGHTS

Articles & thoughts

Writing on technology, products, research and personal observations. Choose an article to preview before reading.

Choose an article

03 / INTERACTIVE LEARNING

Interactive learning

Explore technical and financial concepts through hands-on examples, small games and visualizations.

An illustration of notes becoming searchable documents

RAG basics: how AI looks up information

Explore document retrieval, finding evidence and generating an answer through a playable example.

Start exploring ↗
A diagram showing text divided into meaningful chunks

RAG chunking: where should text be split?

Compare chunking strategies and see how text boundaries affect retrieval.

Try the experiment ↗
Handwritten notes connecting revenue, profit and cash

A finance game: why profit is not cash

Use interactive cases to distinguish revenue, profit and cash flow.

Play the game ↗
A small wooden cash box with coins and a ledger on a desk, a seedling growing from the box

Bookkeeping: From Cash to Credit

Start with a cash box and explore assets, liabilities, and everyday bookkeeping.

Start bookkeeping ↗

04 / PROJECTS & ENGINEERING

Projects & engineering

Systems and engineering experiments built to address real problems, with discoveries from the work.

A painting of Water Margin characters and scenes

Water Margin · GraphRAG

Live

Explore characters, events and relationships in the 120-chapter Yuan Wuya edition on Wikisource, with evidence from the original text.

AI answers may miss details or contain errors. Translations may be imperfect, so check the original Chinese passages.

Explore ↗
Concept diagram of ingestion, retrieval, answer generation and evaluation in a RAG workflow

RAG in practice

Experiments in retrieval, chunking, ranking, and evidence selection — including what worked, what failed, and what changed along the way.

Starts from a real case where a question over Cloudflare Docs got an incomplete answer. Failed attempts are kept on record; the cover is conceptual and does not depict the actual configuration.

Read the investigation ↗

ABOUT / ARCHIVE

Hello, I’m Jianguo.

I work on software, AI and products, and record the observations and judgments that emerge. These notes can be revisited, discussed and revised as experience grows.