Knowledge Engineering Ⅷ | KG Querying
RDF term syntax
Syntax for IRI: PREFIX book: <http://example.org/book/book1
The general syntax for literals: language tag @ or datatype IRI ^^, 语言标识必须加，类型会自动生成
Syntax for query variables: 变量之前加 ? or $
Syntax for blank nodes: 一般可以用?variable代替
123456SELECT ?a ?bWHERE{ ?a :predicate ?vari ...
Knowledge Engineering Ⅶ | KG Alignment
同一实体在不同的database下可能有不同的表示。
ontology matching（schema matching）本体匹配element-level matchingString-based:
字符串前半部分或后半部分相同
Levenshtein distance e.g. sim(NKN, Nikon)=2/5=0.4
N-gram, (此处分母取长单词所分割成的个数)
Language-based:
将带连接符的单词分开
将过去式、复数等化为原型
去掉冠词、介词等
Resource-based:
WordNet A=B（同义词）, A⊥B (A,B 是反义词或具有层级 ...
Knowledge Engineering Ⅵ | KG Construction from Unstructured data
本文我们不深入讲解 Entity linking、Relation Extraction、Event Extraction，这些在NLP中都已讲过。我们重点探究 General is-a Relation Extraction 和 Terminology/Term Extraction 这两个task。
General is-a Relation Extractionis-a relation is the semantic relationship between a more specific word (hyponym 上位词) and the more general term (h ...
Knowledge Engineering Ⅴ | KG Construction from Semi-structured data
fact extraction/type inference/taxonomy Induction
Knowledge Engineering Ⅳ | KG Construction from Structured data
Extracting knowledge from heterogeneous data sources to form a knowledge graph
Basic of Relation Database在表格中，我们会遇到同一事物的不同表示或者相同的表示针对不同事物，以及一些信息的重复记录，我们可以提取表格中的某些信息形成新的表格。
Database terms:
A database is a collection of data
Data is organized into one or more tables
Each row is a record
Each column ...
Knowledge Engineering Ⅲ | Reasoning
KG reasoning is to infer new knowledge from the given KG.
logical reasoningdeductive reasoning 推导结论若下雨，则草地会变湿。因为今天下雨了，所以今天草地是湿的。
forward reasoning
start with available data and use inference rules to extract more data until a goal is reached.
RDFS rules:
123a rdfs:domain x . u a y ._____________ ...
Knowledge Engineering Ⅱ | Representation
XML,RDF,RDFS,OWL
Knowledge Engineering Ⅰ| Introduction
Definition
A field of AI that tries to emulate the judgment and behavior of a human expert in a given field. KE refers to all technical, scientific and social aspects involved in building, maintaining and using knowledge-based systems.
knowledge-based system: a computer program that reasons a ...
操作系统实验：Linux进程管理及其扩展
阅读分析Linux内核源代码, 了解进程控制块, 进程队列等数据结构，实现一个系统调用hide，使得可以根据指定的参数隐藏进程，使用户无法使用ps或top观察到进程状态。
Natural Language Processing
NLP课程不完全记录