Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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PDA with WindowsMobile operating system - smallgeneral purpose pocket computer,on which specialized softwarefor navigation and processingof client requests. It implementsthe interface betweenthe driver and the system; Microphone and loudspeakers- used for verbal communicationbetween the driverand the dispatcher;Fig. 3 Vehicles with onboard computersBecause in today's fast developing technologically world the requirements for datatransmission and processing are constantly rising the functionality of the communicationmodule have to continuously be improved, depending on the current hardwareand software solutions on the market.3. Functional requirements for the design of thecommunication moduleThe communication module is responsible for transmission and processing of thedata, received from onboard computers and for processing the actions of the dispatchersin the system. The main requirement is that this module has to operate continuously.This requires the use of specialized hardware and software designed to workwith the least possible disruption in the service, even in the case of hardware failure.3.1. Hardware requirementsThe requirement for continuous operation of the system requires the use of HA (HighAvailability) hardware. The main feature of the HA hardware is the lack of singlepoint of failure, or SPOF. SPOF may be any device or software which will stop allwork in the event of failure. Common example of this is a single firewall that controlsthe access to the Internet (Figure 4). Commonly used high available hardware is theHA cluster (Figure 5). The main idea is to have a server with redundant components.The work can be transferred online to another identical component in the case ofhardware failure, avoiding the presence of single point of failure [1].3.2. System software requirementsThe system software must be able to manage the used specialized hardware. Thereforethere are requirements for: Virtualization - platform virtualization software may be used to facilitate themaintenance and future development of the system. Platform virtualization is a kindof system software which creates a virtual computer. The virtual computer is a softwarerepresentation of a computer. In the virtual environment, a single physical com-192
puter is running virtualization software, which manages resources so that they can bedistributed among multiple virtual computers (Figure 6). Each virtual computer canexecute different operating system and software. In case of software failure or securitybreak the situation does not affect other virtual computers [2];Fig. 4 Single point of failureFig. 5 HA cluster with two nodes DBMS - it must meet the need for storage and management of increasingvolumes of information and searching by multiple users simultaneously. The chosendatabase management system must be able to do load sharing between multiple computersand data replication online. There must be tools for design and management ofthe databases [3];Fig. 6 Virtual server environment193
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ISSN 1311-0829ГОДИШНИК НА
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Годишник на Технич
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• If a neutral element 1 of the s
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Proof. (i) Since for arbitrary ≀
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)is the endomorphism ≀ 0, . . . ,
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∣∣E (k)C n∣ ∣∣ =Propositi
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For k = 0 and s = 1 from the last p
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Facts concerning semilattices can b
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described by the following join-tab
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Finally we observe{aj , if i = k(f
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Let us consider the endomorphisms f
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Proposition 3.8 For any n ≥ 2 in
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Cryptographic protocols based on DL
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2.5 Bi-Semigroup Action Problem (BS
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Theorem 4.5 [14]. In the center of
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The only way we know for an attacke
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The exact definitions of points and
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FirstIterationSecondIterationx 0 0
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* x4. Order of approximationBecause
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генератори, присъе
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№ РежимТабл.4.1 Бала
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Табл.11 2 3 4 5 6 7Загуби
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оцени разхода на ак
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сформатора се нала
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-да допуска претова
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-големи трудности п
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трансформаторът се
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При известно фазов
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KU BHOCHR (12)w w wЗа да се
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aided impregnation of wood and wood
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different as a result of the differ
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Table 2. Carbon peak C s1 component
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esults indicating that the reductio
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Change of Mass M, %100-10-20-30-40
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However, the correlation between re
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Electrical Apparatus and Technologi
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- преходът към стри
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или магнитно изоли
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от лист електротех
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Фиг. 6. Изменение на
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Fig.1 Block structure of proposed o
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Fig.4. Initial and best shape of po
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Fig.8 Calculated initial cogging to
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Octave/Lua interface is a Matlab to
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pends on the results of the thermal
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4. ResultsAs it has been mentioned
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A DC electromagnetic actuators with
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ращ се наблизо пров
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Фиг. 4. Зависимост н
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че максималната то
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3.7. Ефект близост в
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11 c x6T 2 c3c4c5ec p c1c , (2)
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От кривата на макси
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109.598.5Wind speed, m/s87.576.565.
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Page 225 and 226: Figure 2: Temperature dependence of
Page 227 and 228: An additional analysis obtained at
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Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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