digital data communication techniques
DIGITAL DATA TRANSMISSION - I
Ngày tải lên :
19/10/2013, 17:15
... accurately measuring errors in detected data due to a communications channel Figure A (b) Block parameters digital signal source Summer: Page The summer represents the communications channel in which ... a pulse generator, which can be used as a digital data bit Figure B –II (a) ASK On-off keying implementation We can see that the carrier modulates the data bits and the output waveform is shown ... amplitude, phase or frequency modulation For digital amplitude modulation, it is known as Amplitude Shift Keying Here, the carrier amplitude is determined by the data bit for that interval We note that...
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Practical mod_perl-CHAPTER 18:mod_perl Data-Sharing Techniques
Ngày tải lên :
20/10/2013, 09:15
... Example 18-1 Book/Cache.pm package Book::Cache; %Book::Cache: :DATA = get _data( ); sub get _data { # some heavy code that generates/retrieves data } 1; And initialize this module from startup.pl: use ... child copies the whole data structure into its namespace, and this data structure is not shared anymore Sharing Data Between Various Handlers Sometimes you want to set some data in one of the early ... this data is available for them all via a simple inclusion of the module in the handler’s code: use Book::Cache ( ); $foo = $Book::Cache: :DATA{ bar}; Be careful, though, when accessing this data...
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CUSTOMER SATISFACTION USING DATA MINING TECHNIQUES
Ngày tải lên :
22/10/2013, 09:15
... BASED DATA MINING TECHNIQUES The objective of data mining is to extract valuable information from one’s data, to discover the ‘hidden gold’ In Decision Support Management terminology, data mining ... on data retention and data distillation Rule induction models (Figure 2) belong to the logical, pattern distillation based approaches of data mining These technologies extract patterns from data ... information in data (Parsaye, 1997) User Suggestions Statistical Analysis Search Engine New hypotheses Induction Engine Patterns / Rules DB Figure 2: Rule Induction process Data mining techniques...
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DIGITAL DATA TRANSMISSION - II
Ngày tải lên :
23/10/2013, 15:15
... carrier between known fixed frequencies to convey digital data Normally, FSK modulation is achieved using just two frequencies to represent binary data For example, a frequency of 2000 Hz may represent ... Master Clock) In this mode, a cosine begins at the start of every data period and proceeds at the frequency fx until the end of the data period Then the process repeats Figure 6c The FSk Modulated ... figure 6C The settings are as follows: fs = khz; f0 = khz B The output of the digital summer as well as that of the Digital Signal Source was observed on the oscilloscope The graphs are as shown...
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Tài liệu Lecture 14: The Theoretical Basis for Data Communication: pptx
Ngày tải lên :
10/12/2013, 08:15
... kHz 10 kHz 200 kHz MHz Page (6) CSN200 Introduction to Telecommunications, Winter 2000 Lecture 14 Communication Basics Part-2 Digital Data Signal: Bit rate, is the number of bits transmitted per ... Page (6) CSN200 Introduction to Telecommunications, Winter 2000 Lecture 14 Communication Basics Part-2 telecommunications because most signal levels in the telecommunications system fall within ... Introduction to Telecommunications, Winter 2000 Lecture 14 Communication Basics Part-2 Addition of Frequency Components: Lecture 14.doc Page (6) CSN200 Introduction to Telecommunications, Winter...
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Tài liệu CUSTOMER SATISFACTION USING DATA MINING TECHNIQUES ppt
Ngày tải lên :
11/12/2013, 23:15
... BASED DATA MINING TECHNIQUES The objective of data mining is to extract valuable information from one’s data, to discover the ‘hidden gold’ In Decision Support Management terminology, data mining ... on data retention and data distillation Rule induction models (Figure 2) belong to the logical, pattern distillation based approaches of data mining These technologies extract patterns from data ... information in data (Parsaye, 1997) User Suggestions Statistical Analysis Search Engine New hypotheses Induction Engine Patterns / Rules DB Figure 2: Rule Induction process Data mining techniques...
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Tài liệu Data Communication Basic Concepts pdf
Ngày tải lên :
12/12/2013, 09:15
... Group, Delran NJ 08075 USA Data pro I nformatlon May 1995 “ Datapro Communications Analyst” Data Communications: Concepts Basic 1001 DNW 12 Data communications and data networks are more than ... “ Datapro Communications Analyst” Data Communications: Concepts Basic IOOlDNW Both agreed on the strategyw to be used to transfer the information and the structure of the information Data communications ... the technology elements needed to support it Data networks are such an element, and data cotnmunications is the foundation of data networks Early data communications applications were developed...
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Tài liệu Data Communication Principles P2 pptx
Ngày tải lên :
22/12/2013, 20:17
... PHYsical layer that receives data from the medium and passes it on to the data link layer as DLPDU or data link layer protocol data unit The data link layer strips off the data link header/trailer ... sometimes called a protocol data unit or simply PDU Protocol Data Unit (PDU) is a combination of data and protocol information for the peer-to-peer protocols 2.1.2 Communications Model within ... as unreliable datagram delivery An example of a protocol using datagram switching is the Internet Protocol (IP) A network layer providing datagram service treats each packet of data just like...
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Tài liệu Data Communication Principles P1 pptx
Ngày tải lên :
22/12/2013, 20:17
... and User Data 56 3.1 The Network Data 57 3.2 The Physical Layer Data 3.2.1 Sequence of Events and Definitions 57 67 3.2.2 Modulation of data and signals 70 3.2.3 Digital Encoding of Data 71 3.2.4 ... DATA COMMUNICATION PRINCIPLES For Fixed and Wireless Networks This page intentionally left blank DATA COMMUNICATION PRINCIPLES For Fixed and Wireless ... that the electronic communication systems started as data communication systems, much of their advancement has been in the field of voice For decades, the Public Switched Telecommunications Network...
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Thực trạng hoạt động kinh doanh của công ty viêt nam data communication
Ngày tải lên :
11/01/2014, 13:50
... 1)Thông tin tổng quan Tên công ty: Công ty điện toán truyền số liệu Tên giao dịch quốc tế: Viêt Nam Data Communication Tên viết tắt:VDC Trụ sở chính: Lô 2A _Toà nhà Internet_Làng quốc tế Thăng Long_Phường ... dịch hàng đầu giới: Telstra (Australia), Global One Group, Alcatel (France), Nortel (Canada), NTTCommunication, KDD, Korea Telecom, Singapore Telecom, Microsoft, Oracle (USA), Hongkong telecom,...
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Tài liệu Data Communication Basic Concepts doc
Ngày tải lên :
19/01/2014, 20:20
... Group, Delran NJ 08075 USA Data pro I nformatlon May 1995 “ Datapro Communications Analyst” Data Communications: Concepts Basic 1001 DNW 12 Data communications and data networks are more than ... “ Datapro Communications Analyst” Data Communications: Concepts Basic IOOlDNW Both agreed on the strategyw to be used to transfer the information and the structure of the information Data communications ... the technology elements needed to support it Data networks are such an element, and data cotnmunications is the foundation of data networks Early data communications applications were developed...
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Using Motivation Communication techniques pptx
Ngày tải lên :
19/03/2014, 22:20
... language, tone on telephone, the way of writing email, place for communication and communication medium 38% of the emotional messages of verbal communication are received through use of voice and only ... they are saying to you, and ask them to clarify what their understanding of your communication is 15 Facilities of communication and the Nonverbal Stuff 3 3 For an entire work force about a new ... Well The Target – Focus Technique Communication and its importance 3 3 Transmit and exchange of thoughts, messages or information It creates trust and understanding Communication plays critical place...
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digital & analog communication systems (8th edition)
Ngày tải lên :
05/04/2014, 12:54
... Data Couch, Leon W Digital & analog communication systems / Leon W Couch, II.—8th ed p cm ISBN-13: 978-0-13-291538-0 (alk paper) ISBN-10: 0-13-291538-3 (alk paper) Telecommunication systems Digital ... Era of digital signal processing with microprocessors, digital oscilloscopes, digitally tuned receivers, megaflop personal computers, spread spectrum systems, digital satellite systems, digital ... that a digital communication engineer needs to know how to analyze analog circuits as well as digital circuits Digital communication has a number of advantages: Relatively inexpensive digital circuits...
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Data Mining Techniques: For Marketing, Sales, and Customer Relationship Management - Second Edition
Ngày tải lên :
07/04/2014, 11:16
... Insourcing Data Mining Building an Interdisciplinary Data Mining Group Building a Data Mining Group in IT Building a Data Mining Group in the Business Units What to Look for in Data Mining Staff Data ... the data mining solu tion is more than just a set of powerful techniques and data structures The techniques have to be applied in the right areas, on the right data The virtuous cycle of data ... Role of Data Mining? Customer Activation Relationship Management Retention Winback Lessons Learned Chapter 15 Data Warehousing, OLAP, and Data Mining The Architecture of Data Transaction Data, ...
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decusatis, c. (2002). handbook of fiber optic data communication (2nd ed.)
Ngày tải lên :
18/04/2014, 10:57
... HANDBOOK OF FIBER OPTIC DATA COMMUNICATION HANDBOOK OF FIBER OPTIC DATA COMMUNICATION Second Edition CASIMER DeCUSATIS Editor IBM Corporation Poughkeepsie, ... A common connector for MM data communication networks is the SMA connector (Fig 1.30) 1.4.3 OPTICAL PROPERTIES There is obviously some additional loss produced into a communications link with ... Introduction 13.2 Overview 13.3 Storage Area Networks 13.4 How Fibre Channel Leverages Optical Data Communications 13.5 Summary Web Resources and References Chapter 14 Enterprise Systems Connection...
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decusatis, c. (2001). fiber optic data communication - technological trends and advances
Ngày tải lên :
18/04/2014, 12:25
... FIBER OPTIC DATA COMMUNICATION: TECHNOLOGICAL TRENDS AND ADVANCES FIBER OPTIC DATA COMMUNICATION: TECHNOLOGICAL TRENDS AND ADVANCES CASIMER DeCUSATIS ... microwave communication to commercial reality Satellite microwave communication was a fierce competitor to fiber optic communication, especially through the 1975-1990 era, for long-haul high-volume communication ... major element of long-haul communication, business voice and data transport as well as residential television 1.3 Fiber Optic Communication Advancement, 1950-2000 Communication technology and...
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data mining techniques
Ngày tải lên :
08/06/2014, 11:28
... data warehouse data, as well as complex types of data such as data streams, time-series, sequences, graphs, social networks, multirelational data, spatiotemporal data, multimedia data, text data, ... Microsoft Research We are deluged by data scientific data, medical data, demographic data, financial data, and marketing data People have no time to look at this data Human attention has become a ... Motivated Data Mining? Why Is It Important? 1.2 So, What Is Data Mining? 1.3 Data Mining—On What Kind of Data? 1.3.1 Relational Databases 10 1.3.2 Data Warehouses 12 1.3.3 Transactional Databases...
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tìm hiểu và thực hành trên bộ data communication trainer – dct 03
Ngày tải lên :
09/06/2014, 17:30
... Detect) : Phát tín hiệu sóng mang đường dây Chân RxD ( Receive Data) : Nhận liệu Chân TxD ( Transmit Data) : Truyền liệu Chân DTR ( Data Terminal Ready Ground) : Báo hiệu thiết bị DTE sẵn sàng ... nối với vỏ bọc kim máy tính, với vỏ máy,hoặc đất thực Chân TD ( Transmit Data) : Truyền liệu Chân RD ( Receive Data) : Nhận liệu Chân RTS ( Request To Send) : Yêu cầu gởi, bô truyền đặt ... bị DTE sẵn sàng kích hoạt nhận muốn truyền liệu Chân GND ( Ground) : Mass chung Chân DSR ( Data Set Ready) : Báo hiệu thiết bị DCE sẵn sàng, kích hoạt truyền sẵn sàng nhận liệu Chân RTS...
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