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  Proximity Cards Do More Than Just Open Doors

Credit: Susanne Plank via Pexels Locksmiths from centuries ago couldn’t have possibly imagined opening a door by tapping a card roughly the size of a credit card. Back then, security depended on physical locks, not sealed antennas made from coiled wire, integrated circuits, and capacitors. Today, proximity cards are a popular form of keycard used in hotels, government buildings, healthcare facilities, and many more places. They open doors for people with authorized access, but they also d...

   LOCK,PRINTING     2024-04-11 22:04:07

  Permutation algorithm with JavaScript

In secondary school, we have learned permutation. Basically, for n numbers, the number of permutations for these n numbers can be calculated to n! which is called 'n factorial'. But to display all the permutations on the screen, we need to use a recursive function. The problem is how to write this function.  Next I write a program to display the permutations for n numbers with JavaScript. First, we need to understand that from these n numbers, we can first take any one number from it, and t...

   JavaScript,Permutation,Algorithm,Impleme     2011-09-21 12:02:35

  Create Packed Indexes with MySQL

I am pretty much sure that you are aware of indexes which we are creating on database fields. Indexes are very useful to make your query search faster and improve the site performance. But the fact is that Indexes which we are creating on database tables also require some additional space on your hard disk and if you have not properly created these indexes than some t...

   MySQL,Compressed index,PACK_KEYS     2012-04-24 07:42:18

  Round Peg, Square Hole: How to Know If a Developer is a Good Fit for Your Team

Over the last few months, we have been recruiting developers, and we’ve started to get a sense for the type of developer who is a good fit for our team.  These attributes probably apply for developers at most web startups, so I wanted to share them with you. Before I get into it, the most important thing to know is that technical skill is a threshold requirement.  The assumption is that any person who is a fit for our team will have the relevant technical experience t...

   Recruitment,Gire ,Employee,Skill     2011-07-09 09:50:54

  How can I teach a bright person, with no programming experience, how to program?

I usually prescribe the same sequence for anyone who wants to learn programming. It's very theoretical, but it lays a good foundation. It should take three or four months of fulltime study, but programming isn't something you learn overnight.If you can't get through this sequence, you're not going to be able to program, so you might as well give up now.Code, by Charles Petzold.The C Programming Language, K&RThe Structure and Interpretation of Computer Programs, Abelson and Sussman.My rule is...

   Steps,Programming,No experience,No knowledge     2011-11-07 08:27:48

  PHP's Output Buffering

While profiling our application I came across a a rather strange memory usage by the ob_start() function. We do use ob_start() quite a bit to defer output of data, which is a common thing in many applications. What was unusual is that 16 calls to ob_start() up chewing through almost 700kb of memory, given that the data being buffered rarely exceeds 1-2kb, this was quite unusual. I started looking at the C code of the ob_start() function and found this interesting bit of code inside php_sta...

   PHP,Memory,ob_start(),source,40kB     2011-12-08 10:20:32

  Creating a PHP 5 Extension with Visual C++ 2005

This article describes the steps to create a custom PHP extension DLL for the Windows platform. The Zend API documentation that comes with PHP 5 on Windows (see php_manual_en.chm) does a good job explaining how to write extension methods, parse method parameters, and return values. But there is not currently a good step-by-step tutorial on how to get your first extension project up and running on Windows. The aim of this article is to fill that gap. Prerequisites Visual Studio 2005 You can...

   PHP,Extension,Writing,Windows,Step by st     2011-07-23 01:56:53

  Where Have You Installed Your Python Packages?

Preface I am writing this article because I recently noticed in the Python community that there are several frequently asked questions: Why does running the command after installing pip result in a "executable not found" error? Why does importing a module result in a "ModuleNotFound" error? Why can I run my code in PyCharm, but it doesn't work in the command prompt? Rather than just providing solutions, it is better to teach people how to fish. To address these types of issues, you need to und...

   PYTHON,PATH,PATH_PREFIX,PACKAGE LOCATION     2023-12-17 01:03:45

  An open letter to those who want to start programming

First off, welcome to the fraternity. There aren’t too many people who want to create stuff and solve problems. You are a hacker. You are one of those who wants to do something interesting. “When you don’t create things, you become defined by your tastes rather than ability." – WhyTheLuckyStiff Take the words below with a pinch of salt. All these come from me – a bag-and-tag programmer. I love to get things working, rather than sit at something and over-o...

   Programming,Tips     2011-06-09 23:45:45

  Will China surpass United States on innovation?

I had some discussions on whether China would surpass United States on innovation with some entrepreneurs during last weekend's APEC. The conclusion is United Stats has advantages on innovation today, but in the future, China's innovation will be more widespread and successful. For the next 10 years, what advantages do United States and China have? Actually United States has obvious advantages, especially on innovation structure and innovation culture. Technology -- It's undoubted that Unit...

   Innovation,China,United States     2013-07-15 04:40:12

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