... Chair of Mobile Business & Multilateral Security. Lecture 14 Business Informatics 2 (PWIN) FAQ WS 2015/16

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1 Lecture 14 Business Informatics (PWIN) FAQ WS 015/16 Prof. Dr. Kai Rannenberg Shuzhe Yang, M.Sc. Christopher Schmitz, M.Sc. Chair of Mobile Business & Multilateral Security Jenser (Flickr.com) Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 1

2 Wird die Klausur auf Deutsch oder Englisch gestellt? Und in welcher Sprache darf ich antworten? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security

3 Die Aufgaben werden auf Deutsch gestellt. Sie dürfen auf Deutsch und Englisch antworten. Sprache Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 3 3

4 Bezüglich Dijkstra Algrothmus: mit welchem Anfangsschritt muss ich in der Klausur beginnen? In den Lösungen der Klausur aus dem SS11 wurde der Startpunkt A nicht als Vertex gewählt, sondern direkt ins Set eingeschlossen. Wie sollte man korrekt vorgehen? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 4

5 5 B A D 3 C E H G Dijkstra Algorithm (0) 4 Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 5 I J K 1 M L 4 1 Z

6 5 B A D (0,-) 3 C E H G Dijkstra Algorithm (1) 4 Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 6 I J K 1 M L 4 1 Z

7 5 B A D (0,-) 3 C E H G Dijkstra Algorithm () (5,A) 4 (3,A) Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 7 I J K 1 M L 4 1 Z

8 Lecture 5 Seite 7: dort ist ein 5-Layer-Model zu sehen. Kann auch der eine Host aus 3 Layern bestehen und der zweite Host aus 5 Layern und diese können trotzdem miteinander kommunizieren oder nicht? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 8

9 The figure shows 5 layers. Communication inside one layer uses the respective protocol. No direct data communication from layer n of one host to the same layer n of another host. Layer 4/5 Interface Layer 3/4 Interface Layer /3 Interface Layer 1/ Interface 5-Layer Model Each layer sends data and control messages to the layer below until the lowermost layer was reached. Located below layer 1 is the physical transmission medium which is used for the communication. Source: Tanenbaum (006), p. 4 9 Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 9 Layer 5 Layer 4 Layer 3 Layer Layer 1 Layer 5 protocol Layer 4 protocol Layer 3 protocol Layer protocol Layer 1 protocol Physical Layer Layer 5 Layer 4 Layer 3 Layer Layer 1

10 Lecture 5 Seite 9: wie kann es sein, dass es ein 5-Layer- Model gibt, wenn auf dieser Seite steht, dass das OSI Reference Model aus 7 Layern besteht? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 10

11 OSI Reference Model The OSI reference model consists of seven layers. Layers 1-4 are transport-oriented layers as they focus on the transportion of bits. Layers 5-7 are application-oriented layers as they support the use of data transport applications. The following basic ideas have lead to the 7 layers: Whenever a new level of abstraction is necessary, a new layer has to be introduced Each layer should deal with one well-defined task or function. Application Presentation Source: Tanenbaum (006), p Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 11 Session Transport Network Data Link Physical

12 Lecture 4 Seite 1: könnten Sie evtl. das Schaubild nochmal erklären? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 1

13 NSS RSS VLR BSC BTS HLR MSC BTS BTS GMSC OMC, EIR AuC MSC GSM (G) System Architecture PSTN Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 13 VLR BTS BTS BTS BSC BTS OSS NSS: Network- & Switching Subsystem OSS: Operating Subsystem RSS: Radio Subsystem Based on [Schiller003] 13

14 Ich würde Sie bitten, noch einmal die Berechnungen beim Netzwerkplan anhand eines Beispiels zu erklären. Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 14

15 Determine the project duration and the critical path for the following situation. Use the known schema (see below) to represent the activity times. Activity Duration (days) Activity A - Preceding Activities Activity B 4 {Activity A} Activity C 1 {Activity B} Activity D 1 {Activity C, Activity E} Activity E 5 {Activity B} Activity F 4 {Activity E} Activity G 3 {Activity D, Activity F} Earliest start time Latest start time Network Plan Activity Description Duration Slack time Earliest end time Latest end time Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 15

16 Earliest start time Latest start time Activity Description Duration Slack time Earliest end time Latest end time Activity C Activity D Activity A Activity B Activity G Activity E Activity F Network Plan Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 16

17 Konkret dreht sich meine Frage um das Erstellen eines XML Dokuments auf Basis einer DTD Datei und anders herum. Es wäre schön, wenn zu beiden Fällen jeweils ein weiteres Beispiel besprochen werden könnte. Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 17

18 Create a DTD based on the following XML document. Note that the < > element is mandatory and <student> should appear at least 1 time. XML DTD Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 18

19 <?xml version="1.0"?> <lecture> <student> <name>max Muster</name> <subject>wiwi</subject> <semester>4<semester> <fax> </fax> </student> <student> <name>erika Muster</name> <subject>wiwi</subject> <semester>4</semester> </student> </lecture> < > element is mandatory and <student> should appear at least 1 time XML DTD <!DOCTYPE lecture [ <!ELEMENT lecture (student+)> <!ELEMENT student (name, subject, semester, +, fax?)> <!ELEMENT name (#PCDATA)> <!ELEMENT subject (#PCDATA)> <!ELEMENT semester (#PCDATA)> <!ELEMENT (#pcdata)> <!ELEMENT fax(#pcdata)> ]> Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 19

20 DTD XML Create a minimal XML document based on the following DTD file. Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 0

21 <?xml version="1.0"?> <chair> <department> </department> <lectures> <lecture> <course_number> </course_number> <title> </title> </lecture> </lectures> </chair> DTD XML <!DOCTYPE chair[ <!ELEMENT chair (department,lectures)> <!ELEMENT department(#pcdata)> <!ELEMENT lectures (lecture+)> <!ELEMENT lecture (course_number, title, abbreviation?)> <!ELEMENT course_number (#PCDATA)> <!ELEMENT title (#PCDATA)> <!ELEMENT abbreviation (#PCDATA)> ]> Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 1

22 Können Sie das Thema Kardinalitäten und Komplexitäten bei ER-Modellen nochmal erklären? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security

23 Person ERM: Cardinality & Complexity Cardinality 1 n registers (0,*) (1,1) Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 3 Car Complexity (according to Ferstl/Sinz, 001)

24 Number Name Name Title m:n notation Interval notation Course Number Department 1 Consists of n Chair 1 Offers n (1,*) (1,1) (1,*) (1,1) Lecture ERM: Cardinality & Complexity Description Student Exam Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 4 Is enroll ed in 1 n has 1 n Matriculation number (0,*) (1,1) (,) (1,1) n m Is regist ered for Type (0,*) (0,*) Name

25 Können Sie bitte ein ERM-Beispiel für ein Relationship Type mit Attribut zeigen und erläutern wozu man das benötigt? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 5

26 Matriculation number Student n Points Is registered for ERM: Attributes for Relationship Types Exam Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 6 m ExamID

27 Open Questions? Business Informatics (PWIN) WS 015/16, Chair of Mobile Business & Multilateral Security 7