List of Events

Here is a list of event, includes speaker session and other intermediate slots (e.g. lunch):

Interesting cases and tips in 2 years of Postgres experience

I want to talk about some interesting cases and tips that I met when using Postgres in my daily job, which are topics general enough that most developer may also meet in their daily jobs (even for non-Postgres developers).

  • Why LIMIT 1 is MUCH SLOWER than LIMIT 100?
  • What's wrong with JSONB? (hint: it's TOO robust)
  • Efficient query using LATERAL subquery (from 8s to 0.08s)

How to use verilator

There are many different kinds of programming paradigm such as high-level coding and low-level coding. Verilog is another kind of paradigm, this talk will bring an introduction how coding in Verilog looks like and help audiences to jump start on it.

(廣東話) Programming 有幾種係人都feel到唔同嘅大,例如high level programming就同low level programming好唔同。而Verilog又係另一種好唔同嘅編程範式,希望係呢個talk為大家介紹同埋幫大家極速起手。

(書面語) Programming有兩大範式 : 高級語言(python/java)和底級語言(assembly), 而verilog是有別於以上兩大類的另一編程範式, 希望係此演講為大家介紹和令大家起步編寫verilog。

Matter matters! A brief intro to the new smart home standard and how Home Assistant supports it

In HKOSCon 2022, we discussed how Home Assistant could help to bridge the gaps between smart home products from different camps with local control in mind. We touch-based on the emerging yet promising Matter standard that hoped to resolve a lot of the interpretability challenges of different smart home ecosystems. One year on, products that comply with the Matter standard start to appear, and Home Assistant has also evolved to provide better support for Matter products.

Playing with Raspberry Pi - looking into the use case and play by yourself

Raspberry Pi already know well and many of you now using for your DIY hobbies and business. Do you are having fun playing with it/Is Raspberry Pi useful for your business? Masafumi will give a talk with a couple of use cases, demonstrate some of Raspberry Pi DIY gadgets and discuss what the use case is good to apply your DIY hobby/business projects.

Multi-robot autonomous exploration in 2D

This project demonstrates that multiple robots can collaborate to explore an unknown environment without GPS to generate a map with reasonable accuracy. This addresses exploration as a problem in the planning layer of the robotics domain. A frontier-based  exploration methodology will be explained. The main approach uses Rapidly-expanding Random Trees for frontier detection, and map merging for information sharing. The developed algorithm also makes use of existing solutions for SLAM, and path planning. The algorithm runs in a network of robots, and a master machine on ROS.

Introducing Unikraft: An SDK for fast, secure, and highly-specialized unikernels

Unikernels are specialized operating system images that execute a single application. Through extreme specialization they can provide high performance, small memory footprints, fast boot times, and a reduced attack vector.

This talk will provide an overview of Unikraft (, a Linux Foundation project that provides a toolikit for creating highly specialized unikernels by combining a set of micro-libraries to tailor down the operating system strictly to the needs of the executing application.



本專題將分享分散式出版如何以 NFT 書的全新方式演繹、發行與銷售電子書,以面對資訊審查、封閉花園以及通路壟斷三道圍牆,提供現實案例,介紹分散式出版的的特色如:

  • 文本以共享創意授權,保障知識流通
  • 畫師設計每本獨一無二的封面
  • 文本和封面均存放於分散式存儲如 ipfs,抗衡竄改及流失
  • 透過 NFT 認證每本書的擁有權,創造收藏的條件


Proven software development workflows the OSS way, for your growing business

Many aspiring businesses in various industries need to make use of software as they grow. Open source software development workflows generally allows businesses to keep costs low, are scalable and are also proven to work across different locations, cultures and timezones. In this talk, Gary aims to share the importance of having a good software coding foundation for your business, especially if the business is not purely software-focused. He will share essential parts of a coding foundation that even the tech giants use, thus you can be rest assured of their proven scalability.