I recently did some research on this and talked to Dr. Clayton Lewis (computer Scientist in Residence @ CU Boulder). Much of my answer comes from the copy of Engagement Analysis he gave me. To make popular games, Look at Engagement not Fun Fun is poo…

The Secret Mixed-Signal Life of PWM Peripherals Pulse-width modulation (PWM) peripherals have enjoyed a long association with microcontrollers and power control, starting with motor control and power conversion. For the most part, these applications…

高性能服务器设计(Jeff Darcy's notes on high-performance server design 我想通过这篇文章跟大家共享一下我多年来怎样开发“服务器”这类应用的一些想法和观点(这类应用用名词“server”来表示,还是有点牵强). The purpose of this document is to share some ideas that I've developed over the years about how to develop a certain k…

Apple updated its iPhone a bit ago making the form factor much bigger. The iPhone 6 screen size is both wider and taller and the iPhone 6 Plus also has a higher pixel density. This is an update to my previous post about designing websites for the iPh…

Abstract The content of the web has increasingly become a focus for academic research. Computer programs are needed in order to conduct any large-scale processing of web pages, requiring the use of a web crawler at some stage in order to fetch the pa…

Introduction Many approaches to object oriented modeling tend not to scale well when the applications grow in size and complexity. Context Mapping is a general purpose technique, part of the Domain Driven Design (DDD) toolkit, helps the architects an…

Passive RFID Basics - AN680 INTRODUCTION Radio Frequency Identification (RFID) systems use radio frequency to identify, locate and track people, assets and animals. Passive RFID systems are composed of three components – a reader (interrogator), pass…

2nd order RC Low-pass Filter Center frequency    fc = 23405.13869[Hz] Q factor                  Q = 0.333333333333 Sallen–Key topology http://en.wikipedia.org/wiki/Sallen%E2%80%93Key_topology A low-pass filter, which is implemented with a Sallen–Key…

what are things you do during the high level design phase (before you begin programming) to determine what are the classes you need (especially ones not based on any 'real world objects') and how will they interact with each other? The steps that I u…

A Bayes factor (BF) is a statistical index that quantifies the evidence for a hypothesis, compared to an alternative hypothesis (for introductions to Bayes factors, see here, here or here). Although the BF is a continuous measure of evidence, humans…