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Báo cáo khoa học: Phương pháp CHC song song
Những năm gần đây, cùng với sự phát triển của khoa học kỹ thuật, người ta đã giải quyết được nhiều bài toán hóc búa bằng máy tính. Nhưng bên cạnh đó, vẫn còn khá nhiều các bài toán vẫn chưa tìm được giải thuật phù hợp để giải nó, đó là các bài toán tối ưu, trí tuệ nhân tạo và các bài toán xuất phát từ thực tế cuộc sống như bài...
25 p dtu 18/11/2012 211 1
Từ khóa: khoa học kỹ thuật, CHC song song, mô hình song song, điều khiển robot, kỹ thuật công nghệ, kỹ thuật di truyền
Satellite Communication Engineering
Satellite communication is one of the most impressive spin-offs from space programs, and has made a major contribution to the pattern of international communications. The engineering aspect of satellite communications combines such diverse topics as antennas, radio wave propagation, signal processing, data communication, modulation, detection, coding, filtering, orbital mechanics, and electronics. Each is a major field of study and each has...
269 p dtu 15/11/2012 220 1
Từ khóa: Satellite Communication Engineering, kỹ thuật vệ tinh, Satellite communication, thông tin vệ tinh, data communication, kỹ thuật truyền thông
Principles of spread-spectrum commnication systems
The goal of this book is to provide a concise but lucid explanation and derivation of the fundamentals of spread -spectrum communication systems. Although spread-spectrum communication is a staple topic in textbooks on digital communication, its treatment is usually cursory, and the subject warrants a more intensive exposition. Originally adopted in military networks as a means of ensuring secure communication when confronted with the threats...
457 p dtu 15/11/2012 193 1
Từ khóa: communication systems, communication systems, hệ thống viễn thông, digital communication, kỹ thuật viễn thông, truyền thông kỹ thuật số, digital communication
Performance modeling and analysis of bluetooth networks
Bluetooth is a recent wireless communication technology specifically intended for short range ad hoc networking. It was initially envisaged as a simple cable replacement technology to connect various mobile, portable, and fixed devices such as PDAs, mobile phones, laptops, and printers, but its use has soon spread to include various general purpose networking tasks, and a number of Bluetooth-enabled devices have appeared on the market. In...
319 p dtu 15/11/2012 218 1
Từ khóa: bluetooth networks, wireless communication technology, Bluetooth technology, kỹ thuật công nghệ, công nghệ không dây, công nghệ truyền thông
Protocols for high-efficiency wireless networks
Radio transmissions have opened new frontiers allowing the exchange of information with remote units. From the first applications of telegraphy and radio broadcast, wireless transmissions have obtained a great success with the widespread diffusion of mobile communications. We live in the communication era, where any kind of information must be easy accessible to any user at any time. Mobile communication systems are the technical support that...
301 p dtu 10/11/2012 164 1
Từ khóa: wireless networks, Radio transmissions, wireless transmissions, công nghệ truyền thông, công nghệ không dây, kỹ thuật truyền thông
Multi-Carrier and Spread Spectrum Systems
Nowadays, multi-carrier transmission is considered to be an old concept. Its basic idea goes back to the mid 1960s. Nevertheless, behind any old technique there are always many simple and exciting ideas, the terrain for further developments of new efficient schemes. Our first experience with the simple and exciting idea of OFDM started in early 1991 with digital audio broadcasting (DAB). From 1992, our active participation in several research...
300 p dtu 10/11/2012 164 1
Từ khóa: Spread Spectrum Systems, Multi-Carrier Systems, multi-carrier transmission, kỹ thuật số, kỹ thuật truyền sóng, phát sóng truyền hình
Hardening IEEE 802.11 wireless networks
IEEE 802.11 is a Wireless Local Area Network (WLAN) standard which specifies a radio interface and Layer 2 (Link Layer) protocol for data communications in the 2.4 Ghz spectrum. 802.11b supports up to 11 Mbps of capacity, depending on what part of the world you are in, and has a range of up to a hundred meters or more in open spaces, but more like 50 Meters in a practical office environment using off the shelf equipment. 802.11b is not just...
20 p dtu 10/11/2012 175 1
Từ khóa: wireless networks, Wireless Local Area Network, data communications, truyền thông dữ liệu, kỹ thuật mạng, công nghệ mạng
Handbook of Wireless Networks and Mobile Computing
The past five decades have witnessed startling advances in computing and communication technologies that were stimulated by the availability of faster, more reliable, and cheaper electronic components. The design of smaller and more powerful devices enabled their mobility, which is rapidly changing the way we compute and communicate. For instance, the worldwide number of cellular phone subscribers has quadrupled in the last five years and has...
648 p dtu 10/11/2012 218 1
Từ khóa: communication technologies, Wireless Networks, Mobile Computing, công nghệ truyền thông, linh kiện điện tử, kỹ thuật điện tử
Fiber to the home the new empowerment
Ever since the days of the caveman and his tom-toms, humans have used a bewildering variety of communication technologies: smoke signals, flags, copper wire pairs, coax, two-way or broadcast terrestrial and satellite radio, carriercurrent over power lines, point–point microwave, free-space infrared, and, of course, optical fiber. Out of this grab bag of delivery mechanisms, two stand out as likely to dominate all others as the twenty-first...
157 p dtu 09/11/2012 205 1
Từ khóa: communication technologies, Fiber to the home, satellite radio, công nghệ tuyền thông, kỹ thuật truyền thông, công nghệ mạng
GSM Networks: Protocols, Terminology and Implementation
This text offers a comprehensive treatment of the entire GSM network and the signalling methods of its terrestrial interfaces. It introduces all the interfaces between the GSM subsystems, starting with the Abis- and Air-Interface and continuing on to VLRs, HLRs and MSCs within the NSS. The reader learns about the various signalling standards or methods used in GSM, including TCAP and MAP, and how to apply this knowledge when working with GSM...
417 p dtu 09/11/2012 163 1
Từ khóa: GSM Networks, GSM subsystems, hệ thống mạng, truyền tín hiệu, kỹ thuật tín hiệu, khoa học viễn thông
A User’s Guide to Aspect Ratio Conversion
One of the most confusing – yet critically important – production issues facing television program producers and broadcasters is aspect ratio. Though the technical tools to change aspect ratio are advanced and simple to use, the creative choices facing producers are not. Many variables ranging from program genre to the cultural tastes of viewers come into play when making tough decisions on picture shape for digital television systems.A...
16 p dtu 01/11/2012 171 1
Từ khóa: Ratio Conversion, television program, technical tools, digital television, kỹ thuật truyền hình, khoa học công nghệ
A Primer on Asynchronous Modem Communication
This paper covers the basic RS-232 signaling, error correction, compression, and modulation standards. In the near future, the asynchronous modem will continue to be an important means of transferring information to and from the personal computer. By some estimates, more than 60 percent of people who access the Internet do so with a conventional dial-up modem and a connection to an analog telephone line (www.boardwatch.com). You may be...
16 p dtu 01/11/2012 204 1
Từ khóa: A Primer on Asynchronous Modem Communication, kỹ thuật truyền thông, truyền thông không đồng bộ, khoa học công nghệ, công nghệ truyền thông, thông tin viễn thông