引言

来看一个简单的例子，fifth怎么发音的？(美音)不是/ˈfɪfθ/，而是/ˈfɪθ/。那么什么是elision呢？来看维基百科上的解释：

In linguistics, an elision or deletion is the omission of one or more sounds (such as a vowel, a consonant,
or a whole syllable) in a word or phrase.The word elision is frequently used in linguistic description
of living languages, and deletion is often used in historical linguistics for a historical sound change.

其中vowel指的是元音，如/a/,/e/,/i/,/o/,/u/等。consonant指的是辅音，除了元音剩下的就是辅音。syllable意为音节（the word water is composed of two syllables: wa and ter）。

引言

有一个段子讲：一位日本网友了解到中国强大的“东风”系列导弹，误认为东风二字出自宋代词人辛弃疾的《青玉案·元夕》中的“东风夜放花千树，更吹落，星如雨。”并将其解读为描述分导式弹头再入的壮观场景，以为妙绝。说实话这解释还算浪漫。然而真相是

Introduction

OpenFOAM® is the leading free, open source software for computational fluid dynamics (CFD), and other computational science and engineering. Here is a short introduction of the fundamentals of Finite Volume Method (FVM) in OpenFOAM. Two books are recommended:

• The OpenFOAM Technology Primer
• The Finite Volume Method in Computational Fluid Dynamics - An Advanced Introduction with OpenFOAM® and Matlab®

引言

优秀的作品历久弥新。

从1995年10月4日到1996年3月27日，东京电视台首次播放了一部动画，共26话，在日本引起了轰动和争议。尽管神作层出不穷，至今它仍被众多爱好者认为是最伟大的动漫作品，常被视为日本动画历史上的里程碑。这部作品就是

Introduction

Here is a not so short note (Rolling Update) for machine learning and artificial intelligience. Main concepts and some references are presented. This note is based on Wikipedia, Andrew Ng’s Lecture Notes CS229 of Standford, Machine Learning course of SJTU IEEE-yangyang, and Machine Learning Crash Course of Google.

In this note, let’s discuss about the support vector machine (SVM). Reference is added: the course of CMU (http://www.cs.cmu.edu/~guestrin/Class/10701-S07/Slides/

Linear classifier

A classification decision is made by the linear classifier based on the value of a linear combination of the characteristics (features), which is typically presented to the machine by a feature vector.

• Input: $\vec{x}$
• Output: $y = f(\vec{w} \cdot \vec{x}) = f(\sum_j w_j x_j)$

$f$ is such a function, that maps the values above a threshold to the first class and other values to the second class, or give the probability. $\vec{w}$ is a vector of weights, which can be learned from a set of labeled samples. There are two classes of methods for determining the parameters of $\vec{w}$:

本文介绍如何使用Adobe公司旗下的Premiere来剪辑视频。本文只介绍一些基本操作，仅供入门。其他多种多样的玩法以后有时间再慢慢摸索。

Premiere简介

首先简单介绍一下Premiere这个软件。以下摘自中文维基百科：Adobe Premiere Pro是由Adobe公司开发的非线性编辑的视频编辑软件。Premiere是Creative Suite套装的一部分，可用于图像设计、视频编辑与网页开发。Premiere Pro支持许多不同插件以加强其功能、增加额外的视频/声音效果及支持更多的文件格式。Premiere Pro能支持非常高的清晰度，可最高支持10,240x8,192的显示屏清晰度，以及高至32位的色深，可使用RGB和YUV颜色模型。在声音方面，能支持VST声音插件，以及5.1声道环绕立体声。Premiere Pro的插件能够导入与导出至QuickTime或DirectShow的格式。Premiere Pro也支持很多视频与声音格式，在导出和导入视频时，也提供很多编码解码器。通过使用Cineform Neo line的插件，就可以支持3D编辑功能，也可以在2D的显示屏上看见3D物料。Photoshop文件（psd档）可直接导入至Premiere Pro中。

注意，

引言

企业（Enterprise）号可能是历史上最传奇的一个名字了，除了英法，仅美国共有多达9艘军舰和1架航天飞机以“Enterprise”命名，甚至星际迷航里的联邦星舰NCC-1701A也是。初次印象可能有些奇怪，为什么一个毫无特色的名词这么流行呢？其实，这是翻译的问题。本文就先从Enterprise的含义说起。

来看Webster’s Dictionary韦氏词典上Enterprise的解释：

Introduction

Here is a not so short note (Rolling Update) for machine learning and artificial intelligience. Main concepts and some references are presented. This note is based on Wikipedia, Andrew Ng’s Lecture Notes CS229 of Standford, Machine Learning course of SJTU IEEE-yangyang, and Machine Learning Crash Course of Google.

Bayesian estimation

If you flip a coin, what’s the probability it will fall with the head up? To solve this problem, you may flip the coin many times.

引言

如果你喜欢葡萄酒，一定对拉菲很熟悉。这个法语中的拉菲Lafite，因为赌神的那句“来一瓶82年的拉菲”的著名台词梗火起来。回到1982年夏季的波尔多，气候炎热却不干燥，葡萄成熟较早，等到收成时均是干燥的晴天。在这种气候下收获的葡萄，品质十分完美。Robert M. Parker给出1982年的拉菲古堡干红100分的满分评价，果香浓郁，单宁柔和。2014年纽约春季拍卖会上，一箱82年的拉菲拍出了41,650美元的天价。

不过今天不讲葡萄酒，本文讲的是二战期间美国海军的故事。

Introduction

A propeller in propulsion system can transmit power by converting rotational motion into thrust, based on Bernoulli’s principle. The most common propeller is called the screw propeller, with fixed helical blades rotating around a shaft. The first screw propeller in the world was invented in 1835, by John Ericsson and Francis Pettit Smith. Propellers can be used in marine ships, aircrafts, etc. The basic concepts and priciples in marine propulsion are introduced in this blog.

Geometry