Published: Feb 10, 2019 Tags: iot, booknotes, smartcity Category: Engineering Smart cities: Everyone's connected If everyone, every home, and every business is connected via the IoT, why not take the next step and connect your entire neighborhood, or even the whole city? Connected devices can help reduce congestion on …

Published: Jan 13, 2019 Tags: ai Category: Engineering This blog introduces the basic knowledge of machine learning. The details of algorithm and programming will come in later blogs. Machine learning is a technology which can resolve the computational problem without programming specifically. Process Machine learning …

Published: Dec 07, 2018 Tags: ai, smartcity Category: Engineering I had the honer to give an 'AI for Smart Cities' presentation in 'Big Data & AI Asia' conference Dec 5. The conference was hold in Suntec and it was a big event around hundreds people participated. I managed to convey the following messages in my talk: …

Published: Aug 11, 2018 Tags: web, backend Category: Engineering Recently, I used Node.js quite a lot to handle personal projects. It is easy to start, and also easy to get wrong. This blog covers the basics part of Node.js development. Module Require Every module in node is singleton. Use require to use module, the …

Published: Mar 14, 2018 Tags: security Category: Engineering Authentication and Authorization are two relevant but different concepts, which causes confusion sometimes. Both of them are important for SaaS solution. This blog explains the basic of these two concepts. Single sign on In classic intranet scenarios, …

Published: Mar 07, 2018 Tags: architecture, cloud Category: Engineering Microservice is a software architecture style, in which complex applications are composed of small, autonomous process communicating with each other using language-agnostic API, which is a very common cloud pattern. Microservices Design Principles …

Published: Feb 26, 2018 Tags: blockchain, security Category: Engineering This blog explain the potential scenarios of blockchain usage. The content comes from good articles on web. 分布式数字货币系统 现实生活中常用的纸币具备良好的可转移性，可以相对容易地完成价值的交割。 但是对于数字货币来说，数字化内容容易被复制，数字货币的持有人可以将同一份货币发给多个接受者，这种攻击称为“双重支付攻击”。 中心化控制下，数字货币的实现相对容易。 但是，很多时候很难找到 …

Published: Jan 24, 2018 Tags: security Category: Engineering Hypertext Transfer Protocol Secure (HTTPS) is a safer version of HTTP, which is the communications protocol of the World Wide Web. An HTTPS session is encrypted using either the SSL protocol (Secure Socket Layer) or TLS protocol (Transport Layer Security) and …

Published: Jan 07, 2018 Tags: security Category: Engineering Cryptography is the core part of security, this blog introduces the basic concepts in cryptography and uses .NET as code example. Randomness System.Random and its problems System.Random is a pseudo random number generator A seed value is passed into the …

Published: Jan 4, 2018 Tags: docker Category: Engineering Docker is the world's leading software containerization platform. Docker/container technology becomes more and more popular these days. This blog introduces the basic concept of the above technology. What is docker In the old days, physical machine is the basic …