Anwendung von RFID-Systemen, 1.Auflage by Christian Kern

By Christian Kern

Die Radio-Frequenz-Identifikation (RFID) dient seit etwa 15 Jahren zur Identifikation von Personen, Objekten und Tieren. Mit der inzwischen intestine entwickelten Technologie k?nnen heute Rationalisierungen in vielen Wirtschaftsbereichen erreicht werden. Das Buch bietet eine Darstellung bestehender Anwendungen und Technologiegrundlagen sowie eine Beschreibung der M?glichkeiten und Grenzen von RFID. Es soll dem Projektleiter zugleich als Leitfaden f?r die Auswahl geeigneter RFID-Systeme dienen. Eine Abgrenzung von Funktionseinheiten ist in einer Systembetrachtung enthalten. Der Leser wird in die Lage gebracht, eine RFID-Anwendung von der Idee bis zur Praxis aufzubauen und die richtigen Ressourcen zusammenzustellen. Im Anhang aufgef?hrt sind: Firmen, die im Bereich RFID t?tig sind, eine ?bersicht zu bestehenden Anwendungen in verschiedenen Branchen sowie Gremien und Institute, die sich mit RFID besch?ftigen und kompetente Beratung geben k?nnen.

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Writing the KCL equation for each node in such a subset and adding the results, we obtain the cut-set equation, except for maybe a -1 factor. For example, consider the cut set g2in Fig. 16 Digraph iliustrating the reference direction of a cut set. ). which is the cut-set equation for %, . (3)+(1) It is easy to demonstrate that the set of branches cut by a gaussian surface is either a cut set or a disjoint union of cut sets. So given any gaussian surface, let us write the KCL equation for each of these cut sets; then adding or subtracting these equations, we obtain the KCL equation for the gaussian surface.

2.. . 5) and the n node equations of 9 read where i = (i,, i,, . . , i,lT is called the branch current vector. 6), all the variables . I , , r 2 , . . , i, cancel out; equivalently the n KCL equations are linearly dependent: Suppose that for the connected digraph 9 we choose a datum node and we throw away the corresponding KCL equation, then the remaining n - l equations are linearly independent. Since this is important we state it formally: Independence property of KCL equations For any connected digraph % with n nodes, the KCL equations for any n - 1 of these nodes form a set of n - 1 linearly independent equations.

Which is the cut-set equation for %, . (3)+(1) It is easy to demonstrate that the set of branches cut by a gaussian surface is either a cut set or a disjoint union of cut sets. So given any gaussian surface, let us write the KCL equation for each of these cut sets; then adding or subtracting these equations, we obtain the KCL equation for the gaussian surface. For example, consider gaussian surface Y, of Fig. 15. It is the union of cut set { p , , P,) and cut set {P,. PS. P 6 ) whose equations are, respectively, Subtracting the second equation from the first gives -i, - is - iJ - iz - i6 = O which is the KCL equation for gaussian surface Y1.

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