Cellular

Xem 1-20 trên 1183 kết quả Cellular
  • Tham khảo bài thuyết trình 'mạng thông tin di động số cellular', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Cellular automata make up a class of completely discrete dynamical systems, which have became a core subject in the sciences of complexity due to their conceptual simplicity, easiness of implementation for computer simulation, and their ability to exhibit a wide variety of amazingly complex behavior. The feature of simplicity behind complexity of cellular automata has attracted the researchers' attention from a wide range of divergent fields of study of science, which extend from the exact disciplines of mathematical physics up to the social ones, and beyond....

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  • Modelling and simulation are disciplines of major importance for science and engineering. There is no science without models, and simulation has nowadays become a very useful tool, sometimes unavoidable, for development of both science and engineering. The main attractive feature of cellular automata is that, in spite of their conceptual simplicity which allows an easiness of implementation for computer simulation, as a detailed and complete mathematical analysis in principle, they are able to exhibit a wide variety of amazingly complex behaviour....

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  • Cellular telephony is designed to provide communications between two moving units, called mobile stations (MSs), or between one mobile unit and one stationary unit, often called a land unit.

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  • A book that writer feel can be useful to readers on the following fronts: as a textbook as well as a handbook, since it covers new systems and technologies, as a guide to broadband wireless access and cellular systems, as a reference book for executives, as a textbook for college seniors and graduate students.

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  • The need to keep in touch—we all have it, whether for business or personal reasons. Now you can keep in touch on the way to work or the shopping center, from a construction site or the golf course, or in a rental car or on your boat. If you spend time away from your best communication tool—the telephone—a cellular phone can add several business hours to your week. Now you can stay in touch with your office, your customers, or your family, even as you inch along in a traffic jam. And cellular’s excellent audio performance ensures clear voice reception....

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  • Three distinct sequential cellular responses characterise the reaction of the adult spinal cord and brain to injury. An acute haemorrhagic phase immediately ensues after wounding, in which haematogenous cells flood the lesion site. This is followed by a subacute period during which macrophages clear necrotic debris, glial cell reactions are mobilised, the clot becomes organised, and scarring is initiated. Finally, the scar tissue contracts during a consolidation phase .

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  • In this project, traffic simulation according to the cellular automaton of the Nagel-Schreckenberg model (1992) with different boundary conditions. The sudden occurrence of traffic jams is successfully realised as well as boundary induced phases and phase transitions are observed in the Asymmetric Simple Exclusion Process. The extension to the Velocity Dependent Randomization model leads to metastabile high flow states and hysteresis of the flow. The impact of speed limits on the probability of the formation of traffic jams is investigated.

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  • Road traffic microsimulations based on the individual motion of all the involved vehicles are now recognized as an important tool to describe, understand, and manage road traffic. Cellular automata (CA) are very efficient way to implement vehicle motion. CA is a methodology that uses a discrete space to represent the state of each element of a domain, and this state can be changed according to a transition rule.

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  • The purpose of this study was to estimate travel time under incident conditions on a freeway. This paper presents a cellular automaton model that mimics traffic conditions and estimates travel times from upstream locations through the incident bottleneck, given an estimate of the incident duration.

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  • We study a simple three-lane cellular automaton, based upon the well known NagelSchreckenberg model, and examine the effect of slow cars in such a system. We point out the important parameters defining the shape of the fundamental digram for the three-lane model and compare it to that of a two-lane one, showing the new mode of interactions between lanes. It is possible to reduce the influence of slow cars by choosing an adequate version of the symmetry with respect to lanes.

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  • Mời bạn đọc cùng tham khảo Cellular Automata (CA) in transportation sau đây. Tài liệu hữu ích cho kỹ sư cầu đường, những ai quan tâm đến vấn đề giao thông đường bộ.

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  • In this chapter: Write the overall reaction for glucose breakdown and show that it is a redox reaction; discuss the role of oxidation-reduction enzymes; state the four phases of cellular respiration and tell where each occurs in the cell; contrast the energy-investment step of glycolysis with the energy-harvesting steps;...

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  • Chapter 19 - Cellular mechanisms of development, in this chapter, you will learn: In general terms, compare and contrast plant and animal developmental processes; understand the stages of development, from cleavage to organogenesis, in a model vertebrate; describe the stages of development in a representative insect from the influence of maternal genes to metamorphosis;...

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  • GSM

    GSM (Global System for Mobile Communications), is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe technologies for second generation digital cellular networks. Developed as a replacement for first generation analog cellular networks, the GSM standard originally described a digital, circuit switched network optimized for full duplex voice telephony. The standard was expanded over time to include first circuit switched data transport, then packet data transport via GPRS (General Packet Radio Services)....

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  • HÔ HẤP TẾ BÀO (CELLULAR RESPIRATION)

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  • Generation Change in Cellular Systems In Japan, mobile communications systems based on cellular technology have evolved, as illustrated in Figure 1.1. The first-generation analog car phones were first introduced in 1979, followed by the commercialization of the second-generation digital phones in 1993. Mobile phone subscribers have rapidly increased in number since then, owing to the liberation of terminal sales and continuous price reductions. In March 2000, the number of mobile phone subscribers outnumbered those of fixed telephones.

    pdf0p tienvovan 18-09-2010 124 65   Download

  • The third generation (3G) mobile communication system is the next big thing in the world of mobile telecommunications. The first generation included analog mobile phones [e.g., Total Access Communications Systems (TACS), Nordic Mobile Telephone (NMT), and Advanced Mobile Phone Service (AMPS)], and the second generation (2G) included digital mobile phones [e.g., global system for mobile communications (GSM), personal digital cellular (PDC), and digital AMPS (D-AMPS)].

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  • The previous chapters have concentrated on the two leading second generation (2G) cellular systems: GSM and IS-95. These systems are deployed in many parts of the world and will continue to operate and evolve during the next decade as third generation (3G) systems are rolled out. We may expect that the new 3G systems will be harmonised with their evolved 2G counterparts, and that slowly 2G spectra will be refarmed to provide extra 3G spectra. No 3G systems are currently deployed, although trials are in progress. As a consequence, this chapter, which deals with systems that are about to be...

    pdf99p vankent 19-07-2010 83 29   Download

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