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Speed Hashing
A given hash uniquely represents a file, or any arbitrary collection of data. At least in theory. This is a 128-bit MD5 hash you're looking at above, so it can represent at most 2128 unique items, or 340 trillion trillion trillion. In reality the usable space is substantially less; you can start seeing significant collisions once you've filled half the space, but half of an impossibly large number is still impossibly large. Back in 2005, I wondered about the difference between a checksum and...
Speed hashing,Security,MD5 2012-04-07 10:35:15
Tencent released Q1 earning report of 2013
Tencent has released the earnings report of Q1 in 2013, the total revenue is $2.1611 billion which increases 11.5% compared to last quarter and increases 40.4% compared to the same time last year. The profit is 649.4 million US dollars which increases 17.3% compared to last quarter and increases 37.4% compared last year.The three main profit generators are:1. Value-added services revenue of 1.7014 billion US dollars with an increase of 13.6% compared to last quarter and an increase o...
Tencent,Earnings report,WeChat 2013-05-15 07:02:45
YouTube’s Policy Change: All Set to Take Down Hate Videos
Owing to a major policy change, YouTube is introducing new changes in the ways the videos are streamed on its channel. YouTube being the giant video sharing website is all set to work on a long list of policies regarding the content of videos on its channel. The shift in the policies has been introduced by the Google so that hate speech videos can be taken down by the channel. The most important concern behind the policy shift is to eliminate the videos that are influential in nature. The...
GOOGLE,YOUTUBE,YOUTUBE POLICY,GOOGLE POLICY,TECHNOLOGY 2017-12-27 07:56:02
10 Tips To Make Your C Program Effective
The beauty of any code lies not only in finding the solution to a given problem but is in its simplicity, effectiveness, compactness and efficiency( memory ). Designing the code is harder than actually implementing it. Hence every programmer should keep a couple of basic things in mind while programming in C. Here we introduce you to such 10 ways of standardizing your C code. 1. Avoid unwarranted function calls Consider the following two functions: view source print? 1 void str_print( c...
C,Tips,Efficient,Speed increment,Recursi 2011-08-05 01:34:16
Everything You Thought You Knew About Learning Is Wrong
Taking notes during class? Topic-focused study? A consistent learning environment? All are exactly opposite the best strategies for learning. Really, I recently had the good fortune to interview Robert Bjork, director of the UCLA Learning and Forgetting Lab, distinguished professor of psychology, and massively renowned expert on packing things in your brain in a way that keeps them from leaking out. And it turns out that everything I thought I knew about learning is wrong. Here’s wh...
You know what UTF-8 is when you see it?
When we are coding we may often see some encoding specifications in our source codes such as UTF-8,GB2312. Do you know what these encoding mean and why we need them? In this post, Julián Solórzano will introduce the most widely used encoding specification around the world accomodating all different character sets in the world. UTF-8 is a method for encoding Unicode characters using 8-bit sequences. Unicode is a standard for representing a great variety of characters from many ...
The faster-than-fast Fourier transform
The Fourier transform is one of the most fundamental concepts in the information sciences. It’s a method for representing an irregular signal — such as the voltage fluctuations in the wire that connects an MP3 player to a loudspeaker — as a combination of pure frequencies. It’s universal in signal processing, but it can also be used to compress image and audio files, solve differential equations and price stock options, among other things.The reason the Fourier...
FFT,Fast fourier transform,MIT,Compression 2012-01-19 09:59:09
All Programming is Web Programming
Michael Braude decries the popularity of web programming:The reason most people want to program for the web is that they're not smart enough to do anything else. They don't understand compilers, concurrency, 3D or class inheritance. They haven't got a clue why I'd use an interface or an abstract class. They don't understand: virtual methods, pointers, references, garbage collection, finalizers, pass-by-reference vs. pass-by-value, virtual C++ destructors, or the differences between C# struc...
Programming,Web programming,Opposite,Views,Web app 2011-11-12 10:38:00
Some laws of interactive design
The well known quote from Alan Cooper is Conforming to the standard unless there is a better choice. There are some best practices in interaction design. How many do you know? 1. Fitts' Law The time from one start point to target point is determined by two parameters: The distance to the target and the size of the target. )D and W in above picture), the formula is : T=a+blog2(D/W+1). It was first proposed by Paul Fitts, it is mathematical model used to predict the time from any poin...
interaction design, laws, Fitts' law 2012-11-16 11:25:24
Surprising applications of math
The comments in the previous post touched on surprising applications of math, so I thought I’d expand this theme into it’s own post. Below I’ll give a couple general examples of surprising applications and then I’ll give a couple more personal applications I found surprising.Number theory has traditionally been the purest of pure mathematics. People study number theory for the joy of doing so, not to make money. At least that was largely true until the ...
Math,Number theory,Algorithms,Differential euqation 2011-11-18 09:24:19
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