12/20/07
Recipes and stock solutions described in Protein Expression and Purification 41: 207-234 (2005)
Protein Production by Auto-Induction in High-Density Shaking Cultures
F. William Studier
Biology Department, Brookhaven National Laboratory, Upton, NY 11973
studier@
Abstract. Inducible expression systems in which T7 RNA polymerase transcribes
coding sequences cloned under control of a T7lac promoter efficiently produce a wide variety of
proteins in Escherichia coli. Investigation of factors that affect stability, growth and induction of
T7 expression strains in shaking vessels led to the recognition that sporadic, unintended
induction of expression in complex media, previously reported by others, is almost certainly
caused by small amounts of lactose. Glucose prevents induction by lactose by well-studied
ANSWERS TO QUESTIONS
1.1 The OSI Security Architecture is a framework that provides a systematic way of defining
the requirements for security and characterizing the approaches to satisfying those
requirements. The document defines security attacks, mechanisms, and services, and the
relationships among these categories.
1.2 Passive attacks have to do with eavesdropping on, or monitoring, transmissions.
Electronic mail, file transfers, and client/server exchanges are examples of
transmissions that can be monitored. Active attacks include the modification of
transmitted data and attempts to gain unauthorized access to computer systems.
1.3 Passive attacks: release of message contents and traffic analysis. Active attacks:
masquerade, replay, modification of messages, and denial of service.
1.4 Authentication: The assurance that the communicating entity is the one that it claims to be.
10 -1Finance FIN2FIN
Semester 1, 2010, Lecture 10
CAPM and Fama-French Model
Exam Revision
10 -2Implementation of CAPM
The key components to the CAPM and using
the model are the risk free rate, the beta and
the Market Portfolio Return.
The risk free rate, R
f, is usually take as a
government bond rate.
Various terms to maturity can be considered,
usually consider longer term government
bonds, for example 10 years to maturity.
Systematic Risk, Beta
In practice, getting an estimate of an asset’s
systematic risk involves using regression
analysis to estimate the following equation:
Where
This is normally referred to as the Market
Model.itiiMtitRReαβ=++
constant, for asset i
error termi
iteα=
=Systematic Risk, Beta
Recall the CAPM equation is given by:
Which after some manipulation can be
rewritten as:
The point is, that the alpha matches with the
第47卷第2期Vol.
47No.2计算机工程ComputerEngineering2021年2月
February2021
一种基于MDL的日志序列模式挖掘算法
杜诗晴1，王鹏2，汪卫2
（1.复旦大学软件学院，上海201203；2.复旦大学计算机科学技术学院，上海201203）
摘要：日志数据是互联网系统产生的过程性事件记录数据，从日志数据中挖掘出高质量序列模式可帮助工程师高效开展系统运维工作。针对传统模式挖掘算法结果冗余的问题，提出一种从时序日志序列中挖掘序列模式（DTS）的算法。DTS采用启发式思路挖掘能充分代表原序列中事件关系和时序规律的模式集合，并将最小描述长度准则应用于模式挖掘，设计一种考虑事件关系和时序关系的编码方案，以解决模式规模爆炸问题。在真实日志数据集上的实验结果表明，与SQS、CSC与ISM等序列模式挖掘算法相比，该算法能高效挖掘出含义丰富且冗余度低的序列模式。关键词：数据挖掘；日志分析；事件关系；最小描述长度准则；序列模式
开放科学（资源服务）标志码（OSID）：
中文引用格式：杜诗晴，王鹏，汪卫.一种基于MDL的日志序列模式挖掘算法［J］.计算机工程，2021，47（2）：118-125.英文引用格式：DUShiqing，WANGPeng，WANGWei.AMDL-basedpatternminingalgorithmforlogsequences［J］.ComputerEngineering，2021，47（2）：118-125.
AMDL-basedPatternMiningAlgorithmforLogSequences
DUShiqing1，WANGPeng2，WANGWei2
（1.SoftwareSchool，FudanUniversity，Shanghai201203，China；2.SchoolofComputerScience，FudanUniversity，Shanghai201203，China）
