This document provides the European standard for the frame structure, channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2). It defines the system architecture and specifications for input processing, bit-interleaved coding and modulation, data slice packet generation, layer 1 part 2 signalling, frame building, and OFDM generation. The standard aims to provide improved performance for cable systems over the existing DVB-C standard.
This document provides the European standard for the frame structure, channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2). It defines the system architecture and specifications for input processing, bit-interleaved coding and modulation, data slice packet generation, layer 1 part 2 signalling, frame building, and OFDM generation. The standard aims to provide improved performance for cable systems over the existing DVB-C standard.
This document defines DVB-S.2, a second generation digital video broadcasting system for satellite transmission. DVB-S.2 offers improvements over existing standards like DVB-S, including more powerful error correction, variable coding and modulation, and adaptive coding and modulation. It provides a flexible system suitable for digital television broadcasting, interactive services, news gathering, and other broadband satellite applications. DVB-S.2 is designed to achieve close to channel capacity while maintaining backwards compatibility with DVB-S for some modes during a migration period.
This document provides a beginner's guide to learning Linux. It covers topics such as what Linux is, understanding files and folders, users and permissions, the root user, opening a terminal, basic commands like ls, cd, pwd, and tar for archiving files. The guide explains important Linux concepts and provides examples of common commands to get started using the Linux command line.
1) Reed-Solomon codes are a type of error-correcting code invented in 1960 that can detect and correct multiple symbol errors. They work by encoding data into redundant symbols that can be used to detect and locate errors.
2) Reed-Solomon codes are particularly good at correcting burst errors, where a run of symbols are corrupted together, because they can correct a set number of errors regardless of where in the codeword they occur.
3) The error correction capability increases with lower code rates (more redundant symbols) and longer block lengths, as this averages the noise over more symbols and makes it less likely for a noise burst to corrupt too many consecutive symbols.
1) The document describes a modification to the Huffman coding used in JPEG image compression. It proposes pairing each non-zero DCT coefficient with the run-length of subsequent (rather than preceding) zero coefficients.
2) This allows using separate optimized Huffman code tables for each DCT coefficient position, improving compression by 10-15% over the standard JPEG approach.
3) The decoding procedure is not changed and remains a single pass like JPEG, avoiding increased complexity.
This document provides the European standard for the frame structure, channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2). It defines the system architecture and specifications for input processing, bit-interleaved coding and modulation, data slice packet generation, layer 1 part 2 signalling, frame building, and OFDM generation. The standard aims to provide improved performance for cable systems over the existing DVB-C standard.
This document provides the European standard for the frame structure, channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2). It defines the system architecture and specifications for input processing, bit-interleaved coding and modulation, data slice packet generation, layer 1 part 2 signalling, frame building, and OFDM generation. The standard aims to provide improved performance for cable systems over the existing DVB-C standard.
This document defines DVB-S.2, a second generation digital video broadcasting system for satellite transmission. DVB-S.2 offers improvements over existing standards like DVB-S, including more powerful error correction, variable coding and modulation, and adaptive coding and modulation. It provides a flexible system suitable for digital television broadcasting, interactive services, news gathering, and other broadband satellite applications. DVB-S.2 is designed to achieve close to channel capacity while maintaining backwards compatibility with DVB-S for some modes during a migration period.
This document provides a beginner's guide to learning Linux. It covers topics such as what Linux is, understanding files and folders, users and permissions, the root user, opening a terminal, basic commands like ls, cd, pwd, and tar for archiving files. The guide explains important Linux concepts and provides examples of common commands to get started using the Linux command line.
1) Reed-Solomon codes are a type of error-correcting code invented in 1960 that can detect and correct multiple symbol errors. They work by encoding data into redundant symbols that can be used to detect and locate errors.
2) Reed-Solomon codes are particularly good at correcting burst errors, where a run of symbols are corrupted together, because they can correct a set number of errors regardless of where in the codeword they occur.
3) The error correction capability increases with lower code rates (more redundant symbols) and longer block lengths, as this averages the noise over more symbols and makes it less likely for a noise burst to corrupt too many consecutive symbols.
1) The document describes a modification to the Huffman coding used in JPEG image compression. It proposes pairing each non-zero DCT coefficient with the run-length of subsequent (rather than preceding) zero coefficients.
2) This allows using separate optimized Huffman code tables for each DCT coefficient position, improving compression by 10-15% over the standard JPEG approach.
3) The decoding procedure is not changed and remains a single pass like JPEG, avoiding increased complexity.
This document analyzes the RC4 encryption algorithm and examines how its performance is affected by changing parameters like encryption key length and file size. Experimental tests were conducted to measure encryption time for different key lengths and file types. The results show encryption time increases polynomially with key length and can be approximated using mathematical equations. The document also provides background on encryption methods, how RC4 works, its features, and an example of encrypting an audio file with varying key lengths.
Euler's theorem states that for any plane graph, the number of vertices (v) minus the number of edges (e) plus the number of faces (f) equals 2. The document proves this theorem by considering a minimal tree (T) within the graph and its dual tree (D), showing that the number of edges of T and D sum to the total edges (e) of the original graph. Some applications of the theorem are that any plane graph contains an edge of degree 5 or higher and any finite set of points not all on a line contains a line with exactly two points.
This document discusses three methods for reducing the bit-rate of transmitted video streams: 1) Time-shifting of MPEG-2 packets, which smooths out variable bit-rates without changing individual encoding rates; 2) Open loop transrating, which uses encoding tools to recompress streams at lower rates in a non-reversible way; 3) Closed loop transrating, which iteratively adjusts rates using feedback to maintain quality. These techniques help network operators optimize bandwidth usage and revenues by controlling streaming rates to match infrastructure limits and service pricing models.
AIS is Thailand's largest mobile operator with over 26 million subscribers as of 2022. It has expanded its network coverage to reach 97% of the population. AIS aims to deliver strong shareholder returns and has achieved a total shareholder return of over 100% in the past 5 years. It continues to invest in upgrading its network infrastructure and sees opportunities for growth in the expanding 5G market in Thailand over the coming years. However, it also faces threats from increased competition and regulatory changes around mobile number portability that could impact subscriber retention.
This document outlines the business strategies of an airline company. It discusses core business units, portfolio strategies, transportation business strategies, IT strategies, and corporate social responsibility strategies. Key areas of focus include developing a premium full-service wide-body fleet, regional and low-cost carriers, quality routes, revenue management, and service excellence. The document also examines external opportunities and threats through a SWOT analysis and discusses approaches to leverage strengths and address weaknesses.
This document analyzes the RC4 encryption algorithm and examines how its performance is affected by changing parameters like encryption key length and file size. Experimental tests were conducted to measure encryption time for different key lengths and file types. The results show encryption time increases polynomially with key length and can be approximated using mathematical equations. The document also provides background on encryption methods, how RC4 works, its features, and an example of encrypting an audio file with varying key lengths.
Euler's theorem states that for any plane graph, the number of vertices (v) minus the number of edges (e) plus the number of faces (f) equals 2. The document proves this theorem by considering a minimal tree (T) within the graph and its dual tree (D), showing that the number of edges of T and D sum to the total edges (e) of the original graph. Some applications of the theorem are that any plane graph contains an edge of degree 5 or higher and any finite set of points not all on a line contains a line with exactly two points.
This document discusses three methods for reducing the bit-rate of transmitted video streams: 1) Time-shifting of MPEG-2 packets, which smooths out variable bit-rates without changing individual encoding rates; 2) Open loop transrating, which uses encoding tools to recompress streams at lower rates in a non-reversible way; 3) Closed loop transrating, which iteratively adjusts rates using feedback to maintain quality. These techniques help network operators optimize bandwidth usage and revenues by controlling streaming rates to match infrastructure limits and service pricing models.
AIS is Thailand's largest mobile operator with over 26 million subscribers as of 2022. It has expanded its network coverage to reach 97% of the population. AIS aims to deliver strong shareholder returns and has achieved a total shareholder return of over 100% in the past 5 years. It continues to invest in upgrading its network infrastructure and sees opportunities for growth in the expanding 5G market in Thailand over the coming years. However, it also faces threats from increased competition and regulatory changes around mobile number portability that could impact subscriber retention.
This document outlines the business strategies of an airline company. It discusses core business units, portfolio strategies, transportation business strategies, IT strategies, and corporate social responsibility strategies. Key areas of focus include developing a premium full-service wide-body fleet, regional and low-cost carriers, quality routes, revenue management, and service excellence. The document also examines external opportunities and threats through a SWOT analysis and discusses approaches to leverage strengths and address weaknesses.
![ทำงไปยังสถำนที่นั้นแล้ว เมื่อคุณถึงทีร้ำนอำหำรคุณ Check – in เพื่อน
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คุณก็จะรู้แล้วว่ำคุณถึงทีร้ำนอำหำรแล้ว โดยที่คุณและเพื่อนคุณไม่
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จำำเป็นต้องโทรหำกันแล้วถำมว่ำ อยูที่ไหนแล้ว
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Foursquare สำมำรถที่จะนำำรูปขึ้นโชว์ในสถำนทีที่คุณ
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Check – in และคุณสำมำรถใส่ข้อควำมของคุณพร้อมกับกำร Check –
in ได้อย่ำงเช่น Check – in ทีสนำมบินสุวรรณภูมิ สำมำรถใส่ข้อควำม
่
ว่ำ กำำลังเดินทำงไปจังหวัดเชียงรำย พร้อมภำพถ่ำยที่ประตูทำงออกขึ้น
เครื่อง โดยที่เพื่อนของคุณจะเห็นกำร Check – in ก็สำมำรถโต้ตอบใน
กำร Check – in ที่นั้นๆ เมื่อคุณถึงที่จังหวัดเชียงรำยแล้วคุณ Check –
in ที่สนำมบินแม่ฟ้ำหลวง จังหวัดเชียงรำย เพื่อนของคุณที่เป็นห่วงว่ำ
คุณเดินทำงโดยปลอดภัยไหมก็จะรู้วำคุณถึงที่จังหวัดเชียงรำยแล้วด้วย
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ข้อดีของ Foursquare คือจะรู้ได้วำคนที่คุณเป็นห่วง อยู่ที่ไหน เดินทำง
่
ถึงที่ไหน เพียงแค่คุณ Check – in ผ่ำน Foursquare
ในโลกของ Social network ณ วันนี้ได้พัฒนำไปอย่ำงรวดเร็ว ไม่ว่ำจะ
เป็นทำงด้ำนเทคโนโลยีทั้ง Hardware และ Solfware จะขอพูดถึง
Solfware ทีมีชื่อว่ำ Foursquare ซึ่งตอนนี้ได้รับควำมนิยมสูงขึ้นอย่ำง
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ต่อเนื่องของผู้ใช้งำน Social network ในประเทศไทยและทัวโลก ยอด
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ผู้ใช้งำนเมื่อเดือนกุมภำพันธ์ปี 2010 จำำนวน 350,000 เมื่อนำำมำเปรียบ
เทียบกับเดือนมีนำคมปี 2011 ทีจำำนวนเพิ่มมำกขึ้นถึง 7,500,000 ผู้ใช้
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งำน[i]และมีกำร Check – in ทังหมด 381,576,305 ครั้ง [ii]
้
Foursquare ยังได้รับรำงวัลผู้บุกเบิกเทคโนโลยี 2011 โดย
World Economic Forum ในหมวดเทคโนโลยีสำรสนเทศและสื่อใหม่
แต่ที่นำแปลกใจมีผู้ที่เข้ำมำร่วมเป็นพันธมิตรกับ Foursquare อย่ำง
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มำกมำยไม่ว่ำจะเป็นสื่อสำรมวลชน CNN ,New York Times, Wall
Street Journal, BBC America, History Channel มหำวิทยำลัยชั้นนำำ
Harvard University, Stanford University พิพิธภัณฑ์ Brooklyn
Museum , Metropolitan Museum of Art, Whitney Museum สินค้ำ
หรูอย่ำง Louis Vuitton ,Gucci เครื่องดื่ม Starbucks ,Diet Pepsi
รถยนต์ Mazda ,Chevrolet โทรศัพท์มือถือ Sony Ericsson,
Blackberry รวมไปถึง Nasa ทีมีกำร Check – in จำกอวกำศเป็นครั้ง
่
แรก
Foursquare พัฒนำมำจำกโปรแกรม (Solfware) ทีมีชื่อว่ำ
่
Dodgeball ที่เป็นโครงกำรวิทยำนิพนธ์ระดับบัณฑิตศึกษำของ
Interactive Telecommunications Program (ITP) New York
University ของ Dennis Crowley ซึ่ง Dodgeball ถูก Googel ซื้อไป
เมื่อปี 2005 และเปลี่ยนชื่อใหม่เป็น Google Latitude ในปี 2009](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)