Monday, April 30, 2007

About RDF query

This document provides a survey of RDF query language and implementations and describes their capabilities in terms described in RDF Query and Rules Framework.

2.SPARQL: A query platform for Web 2.0 and the Semantic Web

A full list of different query language implementations can bee seen at But these languages lack both a common syntax and a common semantics. In fact, the existing query languages cover a significant semantic range: from declarative, SQL-like languages, to path languages, to rule or production-like systems. And SPARQL had to fill this gap.

Wednesday, April 25, 2007


1. generative v.s. discriminative
2. inductive v.s. recursive

Monday, April 9, 2007

about Kernel method

tutorial on kernel method

Bernhard Schölkopf. Statistical learning and kernel methods. MSR-TR 2000-23, Microsoft Research, 2000.

Kernel methods retain te original representation of objects and use the object in algorithms only via computing a kernel function between a pair of objects. A kernel function is a similarity function satisfying certain properties. More precisely, a kernel function K over the object space X is binary function K:X*X ->[0, infinite] mapping a pair of objects x,y \in X to their similarity score K(x,y). A kernel function is required to be symmetric and positive-semidefinite.

Monday, April 2, 2007

NOTE: enable curl extension from PHP


@在php.ini中找到有extension=php_curl.dll, 去掉前面的注释.
@将:libeay32.dll, ssleay32.dll, php5ts.dll, php_curl.dll 都拷贝到system32目录下 (或将这些文件的目录加入系统的path变量中)


<? php