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In designing a network device, you make dozens of decisions that affect the speed with which it will perform-sometimes for better, but sometimes for worse. Network Algorithmics provides a complete, coherent methodology for maximizing speed while meeting your other design goals.Author George Varghese begins by laying out the implementation bottlenecks that are most often encountered at four disparate levels of implementation: protocol, OS, hardware, and architecture. He then derives 15 solid principles-ranging from the commonly recognized to the groundbreaking-that are key to breaking t

681.3*C2 --- Computer communication networks: data communications; OSI; security and protection --- 681.3 *C2 Computer communication networks: data communications; OSI; security and protection --- Computer network protocols --- Protocols, Computer network --- Computer networks --- 681.3 *C2 --- Information Technology --- General and Others --- Computer network protocols. --- Computer networks. --- Communication systems, Computer --- Computer communication systems --- Data networks, Computer --- ECNs (Electronic communication networks) --- Electronic communication networks --- Networks, Computer --- Teleprocessing networks --- Data transmission systems --- Digital communications --- Electronic systems --- Information networks --- Telecommunication --- Cyberinfrastructure --- Electronic data processing --- Network computers --- Distributed processing

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Dankzij de snelle evolutie van de informatietechnologie in de laatste jaren zijn heel wat industriële processen beter en efficienter geworden. Deze evolutie was enkel mogelijk dankzij de foutloze en onafgebroken werking van talloze computersystemen die in onze huidige maatschappij onmisbaar zijn geworden. Deze systemen worden steeds groter en complexer omdat toepassingspecifieke hardwareoplossingen vervangen worden door meer algemene softwareoplossingen. Omdat de afhankelijkheid van deze computersystemen, die bijvoorbeeld worden gebruikt bij de controle en sturing van het elektriciteitsnetwerk, zo groot is, moeten ze zeer betrouwbaar zijn. In veranderende situaties moet het computersysteem correct blijven functioneren. Omdat het systeem blootgesteld wordt aan wisselende omstandigheden is aanpasbaarheid nodig, enerzijds functionele aanpasbaarheid aan wisselende beschikbare middelen, en anderzijds aanpasbaarheid van de methodes om de betrouwbaarheid op peil te houden. Dit proefschrift onderzoekt de nood om de betrouwbaarheid aan te passen aan variërende omstandigheden in het systeem zoals bijvoorbeeld beschikbare middelen of aan de omgeving. Deze aanpassingen, bijvoorbeeld van de kwaliteit van de diensten of van de foutbestendigheidsgraad, laten toe dat het systeem toch nog functioneert, zij het in mindere mate, wanneer er fouten of veranderingen optreden. Zo kan de applicatie langer overleven. Voor toepassingen in ons domein (controle en sturing in elektrische energie systemen) is deze aanpasbaarheid een belangrijke eigenschap om de diensten van het elektriciteitsnetwerk te garanderen. Deze dissertatie stelt oplossingen voor om de foutbestendigheid en de kwaliteit van de dienst te integreren op middleware-niveau in gedistribueerde dynamische systemen. De belasting van het systeem wordt continu gemeten en het systeem wordt hieraan aangepast. Ook met omgevingsfactoren wordt rekening gehouden om een aanpasbaar foutbestendig en veilig systeem te krijgen. Dit proefschrift bespreekt het verband tussen de vertrouwbaarheid en de geobserveerde parameters. Mogelijke acties die dan op basis van de observaties ondernomen kunnen worden, zijn het herstellen van de gegevens of het herstarten van delen van de applicatie (software rejuvenation). Er wordt een voorbeeldtoepassing van aanpasbare foutbestendigheid besproken in een computergrid, waar reeds veel gebruik gemaakt wordt van deze observatiemethodes. Omdat deze aanpasbare foutbestendigheid zich op metingen baseert, worden hiervan ook de verbanden met de veiligheid bestudeerd. The evolution of computers and information technology during recent decades supplies the means to simplify, improve and reduce costs in industry, transportation and almost all fields of public life. At this point, society is committed to using computing systems, and depends on their correct and continuous operation. Besides this increasing reliance on computing systems, other trends should be mentioned, such as the growing scale and complexity of these systems, and the use of common technologies to replace more expensive dedicated ones. Given these trends, the dependability of underlying computing systems, used in infrastructures such as electric power infrastructure, becomes a key issue. Given the dynamic nature of the computational systems the need for adaptation becomes obvious. Not only functional adaptation (e.g. to available resources), but also the adaptation of dependability means (e.g. fault tolerance) is relevant for (critical) infrastructures. This work is focused on the need for the adaptation of dependability means to the dynamic conditions of the environment (system resources and external environment). Such an adaptation, for instance of fault tolerance and quality-of-service, allows a system to continue to provide services (possible degraded ones), even in the case of faults or changes causing system degradation or alteration of the operational environment. As such, survivability of the system can be attained. Control systems, such as those deployed in the monitoring/control of energy transport and distribution (the target application of this work) need to satisfy requirements for dependability and survivability. The scope of this work is to identify and assess solutions to integrate fault tolerance and quality-of-service support at middleware level in (distributed) dynamic systems. The specific contributions cover the incorporation of environmental conditions in fault tolerance mechanisms at middleware level to attain adaptive fault tolerance of target applications. A mechanism is proposed to integrate load monitoring information in the fault tolerance adaptation mechanism. Aspects related to a monitoring-based approach, such as reliability of data, possible adaptation actions triggered by monitoring (recovery, rejuvenation), and security, are also considered. Due to the extensive use of monitoring in Grid, a case analysis for Grid as target application for adaptive fault tolerance mechanisms is presented. Given the reliance on the monitoring of adaptive techniques, the relationships between adaptive fault tolerance and security requirements are also identified. The evolution of computers and information technology during recent decades supplies the means to simplify, improve and reduce costs in industry, transportation and almost all fields of public life. At this point, society is committed to using computing systems, and depends on their correct and continuous operation. Besides this increasing reliance on computing systems, other trends should be mentioned, such as the growing scale and complexity of these systems, and the use of common technologies to replace more expensive dedicated ones. Given these trends, the dependability of underlying computing systems, used in infrastructures such as electric power infrastructure, becomes a key issue. Given the dynamic nature of the computationalsystems the need for adaptation becomes obvious. Not only functional adaptation (e.g. to available resources), but also the adaptation of dependability means (e.g. fault tolerance) is relevant for (critical) infrastructures. This work is focused on the need for the adaptation of dependability means to the dynamic conditions of the environment (system resources and external environment). Such an adaptation, for instance of fault tolerance and quality-of-service, allows a system to continueto provide services (possible degraded ones), even in the case of faults or changes causing system degradation or alteration of the operational environment. As such, survivability of the system can be attained. Control systems, such as those deployed in the monitoring/control of energy transport and distribution (the target application of this work) need to satisfy requirements for dependability and survivability. The scope of this work is to identify and assess solutions to integrate fault tolerance and quality-of-service support at middleware level in (distributed) dynamic systems. The specific contributions cover the incorporation of environmental conditions in fault tolerance mechanisms at middleware level to attain adaptive fault tolerance of target applications. A mechanism is proposed to integrate load monitoring information in the fault tolerance adaptation mechanism. Aspects related to a monitoring-based approach, such as reliability of data, possible adaptation actions triggered by monitoring (recovery, rejuvenation), and security, are also considered. Due to the extensive use of monitoring in Grid, a case analysis for Grid as target application for adaptive fault tolerance mechanisms is presented. Given the reliance on the monitoring of adaptive techniques, the relationships between adaptive fault tolerance and security requirements are also identified.

681.3*C2 <043> --- 681.3*C24 <043> --- Academic collection --- Computer communication networks: data communications; OSI; security and protection--Dissertaties --- Distributed systems: distributed databases; distributed applications; networkoperating systems--Dissertaties --- Theses --- 681.3*C24 <043> Distributed systems: distributed databases; distributed applications; networkoperating systems--Dissertaties --- 681.3*C2 <043> Computer communication networks: data communications; OSI; security and protection--Dissertaties

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#gsdb8 --- C2 --- Sociëteit van Jezus (1540-1773 1814-heden) --- Hurtado Cruchaga, Alberto (1901-1952) --- Chili [land in werelddeel Amerika] --- Religieuze instituten --- Sociëteit van Jezus (1540-1773 ; 1814-heden) --- Albertus Hurtado

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De markt van mobiele communicatie is nog altijd het snelst groeiende segment van de wereldwijde computer- en communicatiemarkt. Jochen Schiller behandelt in zijn boek Mobiele communicatie uitgebreid de huidige stand van zaken in de technologie en het onderzoek van mobiele communicatie, en schetst daarnaast een gedetailleerde achtergrond van het vakgebied. In het boek worden alle belangrijke aspecten van mobiele en draadloze communicatie besproken, van signalen en toegangsprotocollen tot beveiliging en de eisen die applicaties stellen. De nadruk ligt hierbij op de overdracht van digitale data. Schiller illustreert de theorie met vele voorbeelden en maakt gebruik van diverse didactische hulpmiddelen, waardoor het boek zeer geschikt is voor zelfstudie en gebruik in het hoger onderwijs.

Telecommunication technology --- Computer architecture. Operating systems --- Electronics --- GSM (global system for mobile communications) --- mobiele communicatie --- 681.3*D44 --- LAN --- satellietcommunicatie --- telecommunicatie --- transmissie --- 004.7 --- datacommunicatie --- elektronica --- netwerken --- Computernetwerken --- Draadloze computernetwerken --- Draadloze datatransmissiemedia --- Mobiele communicatie --- Telecommunicatietechniek --- DECT --- DVB --- Datacommunicatie --- Draadloos --- GSM --- MAC --- Satellieten --- TETRA --- Telecommunicatie --- Transmissie --- UMTS --- 621.39 --- Draadloze communicatie --- Mobiele telefonie --- 681.3*D44 Communications management: buffering; input/output; message sending; network communication; terminal management (Operating systems)--See also {?681.3*C2} --- Communications management: buffering; input/output; message sending; network communication; terminal management (Operating systems)--See also {?681.3*C2} --- computercommunicatie. Computernetwerken --- Elektronica --- Computerarchitectuur. Operating systems --- mobiele telefoons --- cellular telephones --- Communicatie

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Canisius, Petrus --- catechismus --- geschiedenis --- Cansius, Petrus --- 16de eeuw --- #GBIB: jesuitica --- 271.5-6 --- 268 "15" --- C2 --- Jezuïeten - Nederlandse provincie --- nieuwe tijd (x) --- Jezuïeten: discipline; eigenheid --- Catechese. Godsdienstonderwijs--?"15" --- Religieuze instituten --- Exhibitions --- 271.5-6 Jezuïeten: discipline; eigenheid --- catechisms --- catechismus. --- geschiedenis. --- Cansius, Petrus. --- 16de eeuw. --- Petrus Canisius