Posts

GFW, a Technical Analysis

Posted on June 9, 2020

The Great Firewall (GFW) is the infrastructure that filters and blocks internet traffic to and from China. It is widely known to censor and block access to certain foreign websites from inside of China and thus a frequent accusation point by China critics. But it is less known to defend... [Read More]

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Networking

Secure Home Networking: IoT Automation with Home Assistant

Posted on June 6, 2020

This post introduces Home Assistant, an open-source home IoT automation that puts local control and privacy first. it also helps address many IoT platform by providing a cross-vendor management interface. [Read More]

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Wharton on Coursera: Managing Social and Human Capital

Posted on May 3, 2020

This is the course notes I took when studying Managing Social and Human Capital, offered by Wharton on Coursera. [Read More]

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Business

Wharton on Coursera: Introduction to Financial Accounting

Posted on April 26, 2020

This is the course notes I took when studying Introduction to Financial Accounting, offered by Wharton on Coursera. [Read More]

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Business

Wharton on Coursera: Introduction to Corporate Finance

Posted on April 13, 2020

This is the course notes I took when studying Introduction to Corporate Finance, offered by Wharton on Coursera. [Read More]

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Business

Coursera Programming Languages, Part A

Posted on April 7, 2020

This is the course notes I took when studying Programming Languages (Part A), offered by Coursera. Subsequently I studied Part B and Part C. [Read More]

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Computer Science

Java 8 Functional Interface

Posted on February 7, 2020

Java is a strongly object-oriented language. Only object and primitive types can be part of function input and output. In other languages, function is just another type, allowing the creation of higher-order functions that take functions as input or return a function as output. Being object oriented is not bad,... [Read More]

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Java

Aspect-Oriented Programming and AspectJ

Posted on February 2, 2020

Aspect-oriented programming (AOP) is a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It does so by adding additional behavior to existing code (an advice) without modifying the code itself, instead separately specifying which code is modified via a “pointcut” specification. This allows behaviors... [Read More]

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Java

Set Up Python Environment

Posted on February 1, 2020

Two categories of setup are required to develop or run Python projects: [Read More]

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Python

Python Data Class

Posted on February 1, 2020

Often we need a named data holder to store data according to certain schema. The object-oriented way is to create data classes with typed fields. For example, in Java we can create Java POJO, and with the help of Lombok, it is pretty simple: [Read More]

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Python

Try-with-Resource Statements in Java

Posted on January 31, 2020

There are many resources, such as file handles, sockets, or buffers, must be closed after use to avoid resource leakage. It is easy to forget to do so or implement it in an incorrect way. In Python, the with statement simplifies the management of closable resources by automatically invoking it’s... [Read More]

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Java

《投资中最简单的事》书摘

Posted on January 19, 2020

这是邱国鹭所著投资中最简单的事的书摘。 [Read More]

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Finance
Book

Secure Home Network - Troubleshoot DHCP Problems

Posted on January 11, 2020

Recently, after an EdgeOS upgrade, I started to see intermittent DHCP timeouts from my UniFi controller, mostly from new clients. Then after flushing the DHCP lease, all devices are unable to obtain an IP address, indicating a problem with the DHCP server. [Read More]

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Secure Home Network - Extend WiFi Coverage with Multiple APs

Posted on January 11, 2020

In many cases, you can get good WiFi coverage with only one Access Point (AP). However, when [Read More]

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HomeNetwork

Secure Home Network - Backup Your Configurations

Posted on November 23, 2019

Now, you have already set up your device and your management systems (UniFi Controller and UNMS). Nothing lasts forever so it is important to configure backups so that in an unlikely event of disaster, you can easily restore your device configurations and management systems. [Read More]

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HomeNetwork