A new study of dss based on neural network and data miningAttaporn Ninsuwan
This document proposes using neural networks and data mining to support intelligent decision support systems (IDSS). It discusses how neural networks can help with knowledge learning, problem solving abilities, and real-time processing. Data mining can be used for analysis, clustering, and concept description. The paper then presents a framework for an IDSS combining neural networks, data mining, reasoning, and natural language processing. It provides an example application to evaluate using marsh gas instead of oil and natural gas in China.
This document discusses the design of a geographic information system (GIS) software platform integrated with a decision support system (DSS) for use in e-government applications in China. It proposes a new approach that tightly integrates DSS techniques with GIS techniques to provide comprehensive information and decision-making services to governments. The platform uses a uniform database design and data management approach. It is developed using a component-based approach to achieve close integration of GIS and DSS functions. The platform adopts a client-server architecture for applications and a client-server structure for system maintenance.
Controlling cell destruction using dielectrophoretic forces measures the factors that influence cell destruction during dielectrophoresis (DEP) experiments. A field-frequency window was identified that should be avoided to minimize cell damage or utilized to selectively destroy specific cell types. The width and location of this window depends on cell type properties like size, morphology, and dielectric properties, and is bounded by two characteristic frequencies - the DEP cross-over frequency and a frequency determined by the time constant that controls the frequency dependence of the induced field across the cell membrane. Operating in this window can minimize destruction by ensuring cells are not near electrodes, or exploit this window to selectively destroy cell types in a mixture.
A new study of dss based on neural network and data miningAttaporn Ninsuwan
This document proposes using neural networks and data mining to support intelligent decision support systems (IDSS). It discusses how neural networks can help with knowledge learning, problem solving abilities, and real-time processing. Data mining can be used for analysis, clustering, and concept description. The paper then presents a framework for an IDSS combining neural networks, data mining, reasoning, and natural language processing. It provides an example application to evaluate using marsh gas instead of oil and natural gas in China.
This document discusses the design of a geographic information system (GIS) software platform integrated with a decision support system (DSS) for use in e-government applications in China. It proposes a new approach that tightly integrates DSS techniques with GIS techniques to provide comprehensive information and decision-making services to governments. The platform uses a uniform database design and data management approach. It is developed using a component-based approach to achieve close integration of GIS and DSS functions. The platform adopts a client-server architecture for applications and a client-server structure for system maintenance.
Controlling cell destruction using dielectrophoretic forces measures the factors that influence cell destruction during dielectrophoresis (DEP) experiments. A field-frequency window was identified that should be avoided to minimize cell damage or utilized to selectively destroy specific cell types. The width and location of this window depends on cell type properties like size, morphology, and dielectric properties, and is bounded by two characteristic frequencies - the DEP cross-over frequency and a frequency determined by the time constant that controls the frequency dependence of the induced field across the cell membrane. Operating in this window can minimize destruction by ensuring cells are not near electrodes, or exploit this window to selectively destroy cell types in a mixture.
This document is a table of contents and introduction for a book titled "jQuery Fundamentals" by Rebecca Murphey. The book covers jQuery basics, core concepts, events, effects, Ajax, plugins, and advanced topics. It includes over 50 code examples to demonstrate jQuery syntax and techniques. The book is available under a Creative Commons license and the source code is hosted on GitHub.
This document provides a preface and table of contents for a book on jQuery concepts. The preface explains that the book is intended to teach intermediate and advanced jQuery concepts through code examples. It highlights some stylistic approaches used in the book, such as emphasizing code over text explanations and using color coding. It also defines some key terms that will be used, and recommends reviewing the jQuery documentation and understanding how the text() method works before reading the book. The table of contents then outlines the book's 12 chapters and their respective sections, which cover topics like selecting, traversing, manipulating, events, plugins and more.
This document is a table of contents and introduction for a book titled "jQuery Fundamentals" by Rebecca Murphey. The book covers jQuery basics, core concepts, events, effects, Ajax, plugins, and advanced topics. It includes over 50 code examples to demonstrate jQuery syntax and techniques. The book is available under a Creative Commons license and the source code is hosted on GitHub.
This document provides a preface and table of contents for a book on jQuery concepts. The preface explains that the book is intended to teach intermediate and advanced jQuery concepts through code examples. It highlights some stylistic approaches used in the book, such as emphasizing code over text explanations and using color coding. It also defines some key terms that will be used, and recommends reviewing the jQuery documentation and understanding how the text() method works before reading the book. The table of contents then outlines the book's 12 chapters and their respective sections, which cover topics like selecting, traversing, manipulating, events, plugins and more.
This document proposes techniques for embedding unique codewords in electronic documents to discourage illicit copying and distribution. It describes three coding methods - line-shift coding, word-shift coding, and feature coding - that alter document formatting or text elements in subtle, hard-to-detect ways. Experimental results show the line-shift coding method can reliably decode documents even after photocopying, enabling identification of the intended recipient. The techniques aim to make unauthorized distribution at least as difficult as obtaining documents legitimately from the publisher.
This document discusses the field of computer forensics. It defines computer forensics as the collection, preservation, and analysis of computer-related evidence. The goal is to provide solid legal evidence that can be admitted in court and understood by laypeople. Computer forensics is used to investigate various incidents including human behavior like fraud, physical events like hardware failures, and organizational issues like staff changes. It aims to determine the root cause of system disruptions and failures.
This document discusses techniques for data hiding, which involves embedding additional data into digital media files like images, audio, or text. It describes several constraints on data hiding, such as the amount of data to hide, ensuring the data remains intact if the file is modified, and preventing unauthorized access to the hidden data. The document outlines traditional and novel data hiding techniques and evaluates them for applications like copyright protection, tamper-proofing, and adding supplemental data to files. It also discusses tradeoffs between hiding more data versus making the data more robust against modifications to the file.
This document summarizes an analysis of over 200,000 websites engaged in badware behavior according to Google's Safe Browsing initiative. The analysis found that over half of infected sites were located in China, with the top three Chinese network blocks accounting for 68% of infections in that country. In contrast, infected sites in the US were more distributed. Compared to the previous year, the total number of infected sites increased, likely due to expanded scanning and increased malware distribution through websites.
Steganography has been used for over 2500 years to hide secret messages. The paper explores steganography's history from ancient times through modern digital applications. It discusses early examples like Johannes Trithemius' steganographic treatise in the 15th century. Modern uses include microdots, digital images, audio, and digital watermarks for copyright protection. Terrorist groups may use steganography but there is no public evidence yet. Steganography continues to evolve with technology while attackers work to defeat new techniques.
The document discusses various cryptographic techniques including symmetric and asymmetric encryption. Symmetric encryption uses the same key for encryption and decryption, while asymmetric encryption uses two different keys. The document then describes the Data Encryption Standard (DES) algorithm and its variants, including Triple DES. It also covers the Advanced Encryption Standard (AES) algorithm, its design principles, and modes of operation for block ciphers like ECB, CBC, CFB and OFB.
This document discusses the topic of steganography, which is hiding secret messages within other harmless messages. It outlines different techniques for hiding messages in text, images, and audio files. For text, it describes line shift coding, word shift coding, and feature coding methods. For images, it explains least significant bit insertion and exploiting the limitations of the human visual system. For audio, it mentions low-bit encoding and other techniques like phase coding and spread spectrum. It also discusses steganalysis, which aims to detect and destroy hidden messages within files.
This document discusses the need for computer security and provides an introduction to key concepts. It explains that security is necessary to protect vital information, provide authentication and access control, and ensure availability of resources. The document then outlines common security threats like firewall exploits, software bugs, and denial of service attacks. It also discusses basic security components of confidentiality, integrity, and availability as well as goals of preventing attacks, detecting violations, and enabling recovery.
The document discusses various types of malicious programs including buffer overflows, viruses, worms, Trojan horses, backdoors, and logic bombs. It describes how buffer overflows can corrupt the program stack and be exploited by attackers. It explains that viruses attach themselves to other programs and replicate, worms replicate across networks, and Trojan horses masquerade as legitimate programs. It also outlines different approaches for antivirus software including signature-based, heuristic, activity monitoring, and full-featured protection.
This document discusses various topics relating to web security, including:
1) Different types of web pages like static, dynamic, and active pages and the technologies used to create them like JavaScript, Java, and CGI.
2) Security issues associated with technologies like ActiveX, Java applets, JavaScript, and cookies.
3) Protocols for secure communication like HTTPS, digital certificates, and single sign-on systems.
4) Methods for secure electronic commerce including SET and digital cash technologies.
This document provides an overview of network security topics including attacks like diffing, sniffing, session hijacking and spoofing. It discusses protocols for secure communication including SSL, TLS and IPSec. SSL and TLS provide security at the transport layer by encrypting data between a client and server. IPSec provides security at the network layer for both transport and tunnel modes. Authentication Header and Encapsulating Security Payload are the two security protocols used in IPSec.
This document provides an overview of network security topics including diffing, sniffing, session hijacking, spoofing, SSL, TLS, IPSec, and VPNs. It discusses how these attacks work and methods to protect against them, such as encryption. Network layer security protocols like IPSec are described, which uses authentication headers or encapsulating security payloads to provide security services to packets. Transport layer security protocols SSL and TLS are also summarized, including how they establish encrypted sessions between clients and servers.
This document discusses various topics related to computer security authorization, including multilevel security models like Bell-LaPadula and Biba's model, covert channels, inference control, CAPTCHAs, firewalls, and intrusion detection systems. It also provides an overview of network layers like the network layer, transport layer, TCP, and UDP. The key models discussed are Bell-LaPadula for confidentiality and Biba's model for integrity. Covert channels, inference control, and intrusion detection systems are described as techniques for authorization and access control.
This document discusses various methods of authentication, including message authentication, entity authentication, and digital signatures. It describes techniques such as hashing, message authentication codes (MACs), digital signatures using RSA, and challenge-response authentication. It also covers other authentication methods such as passwords, biometrics, and zero-knowledge proofs. The goal of authentication is to verify the identity of entities and ensure the integrity and authenticity of messages.
This document discusses the discrete-time Fourier transform (DTFT). It begins by introducing the DTFT and how it can be used to represent aperiodic signals as the sum of complex exponentials. Several properties of the DTFT are then discussed, including linearity, time/frequency shifting, periodicity, and conjugate symmetry. Examples are provided to illustrate how to compute the DTFT of simple signals. The document also discusses how the DTFT can be used to represent periodic signals and impulse trains.
This document discusses the continuous-time Fourier transform. It begins by developing the Fourier transform representation of aperiodic signals as the limit of Fourier series coefficients as the period increases. It then defines the Fourier transform pairs and discusses properties like convergence. Several examples of calculating the Fourier transform of common signals like exponentials, pulses and periodic signals are provided. Key concepts like the sinc function are also introduced.
Chapter3 - Fourier Series Representation of Periodic SignalsAttaporn Ninsuwan
This document discusses Fourier series representation of periodic signals. It introduces continuous-time periodic signals and their representation as a linear combination of harmonically related complex exponentials. The coefficients in the Fourier series representation can be determined by multiplying both sides of the representation by complex exponentials and integrating over one period. The key steps are: 1) multiplying both sides by e-jω0t, 2) integrating both sides from 0 to T=2π/ω0, and 3) using the fact that the integral equals T when k=n and 0 otherwise to obtain an expression for the coefficients an. Examples are provided to illustrate these concepts.
