Konzipierung, Inbetriebnahme und Test der Kommunikationsrechner im Rahmen des SkyView-Projektes
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Inhaltsangabe: Einleitung: Das Experiment SkyView" der Universität Wuppertal zielt auf den Nachweis hochenergetischer kosmischer Teilchen ab, die über ihre bei Sto kaskaden entstandenen Sekundärteilchen auf gro er Fläche (> 15000 qkm) erfasst werden sollen. Aufgrund der dafür notwendigen gro en Anzahl von Me stationen kommt dem Datentransfer und der Datensicherung eine elementare Rolle zu. Ziel dieser Arbeit ist, die Kommunikationsrechner mit möglichst geringen Abmessungen und Stromaufnahmen zu konzipieren und zu realisieren. Zu deren Betrieb ist frei verfügbare Software einzusetzen und diese an die Kommunikationsrechner anzupassen. Der Me stations-Prototyp sowie die damit verbundene Datenkommunikation soll hierbei an einer ausgewählten Schule aufgebaut und mit beliebig simulierten Pseudo-Me werten getestet werden. Inhaltsverzeichnis: Inhaltsverzeichnis: 0.Hintergrund3 0.1Das Projekt SkyView4 0.1.1Astrophysikalische Problemstellung4 0.1.2Aufbau des Experimentes6 1.Einleitung11 1.1Informationstechnologische Problemstellung11 1.2Grundkonzept13 1.3Ziel der Arbeit15 2.Kommunikationseinheit am Messort17 2.1Hardwareanforderungen17 2.2Hardware18 2.3Software18 2.3.1Softwareanforderungen18 2.3.2Anpassung und Konfiguration des Betriebssystems20 2.3.3Datenkanalinitialisierung Roof_MakePipe24 2.3.4Simulator der PCI-Auswertekarte Roof_CardSim26 2.3.5Messwertempfangssoftware Roof_CardRec29 2.4Test33 3.Kommunikationseinheit in der Schule35 3.1Hardwareanforderungen35 3.2Hardware36 3.3Software36 3.3.1Softwareanforderungen36 3.3.2Anpassung und Konfiguration des Betriebssystems38 3.3.3Der cron-Daemon und dessen Einsatz39 3.3.4Datenabrufsoftware Server_From Roof41 3.3.5MD5-Verifikator Server_MD5Check43 3.4Test47 4.Sichere Datenübertragung49 4.1SecureShell (SSH) im Überblick49 4.1.1Verfahren50 4.1.2Schlüssel und Schlüsselgenerierung50 4.1.3ssh (OpenSSH SSH client) und dessen Verwendung52 4.1.4scp (secure copy) und dessen Verwendung52 4.2 MD5 Message Digest Algorithmus52 5.Zusammenfas
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