Introducción a la diagnosis
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1 Introducción a la diagnosis Diagnosis desde la perspectiva de la Inteligencia Artificial 1 Introducción a la diagnosis 1.1 Diagnosis desde la perspectiva de la Inteligencia Artificial 1.2 Tarea de Diagnosis: Distintas aproximaciones
2 Davies example Expert Systems: Where Are We? And Where Do We Go From Here? Randall Davies. The AI Magazine, Spring Problem: Field service. Can I help you? Yeah. My machine doesn t work! What seem to be wrong? Well, when I sit at the console terminal and load the system, everything s just fine. The hardware powers up, the operating system loads, and it s clear that the operating system is running. From the console terminal everything is just fine. But he user terminals don't work. They re turn on and they look OK, but when you type something, absolutely nothing happens. So what s wrong Diagnosis desde la prespective de la Inteligencia Artificial 2
3 Davies example Console Terminal Computer OK BAD BAD BAD Users Terminals BAD BAD BAD Diagnosis desde la prespective de la Inteligencia Artificial 3
4 To start with... To reason about the system we need to know Structure Components behaviour Diagnosis desde la prespective de la Inteligencia Artificial 4
5 System configuration Console Terminal CPU MEM MEM Bus #1 Bus #2 INT Disc Users Terminals Diagnosis desde la prespective de la Inteligencia Artificial 5
6 Exoneration Console Terminal CPU MEM MEM Bus #1 INT Disc Bus #2 Users Terminals Some components probably work properly because they do what they are expected to do: we can load the operating systems from disc ant it respond to the console terminal inputs Diagnosis desde la prespective de la Inteligencia Artificial 6
7 Incrimination Console Terminal CPU MEM MEM Bus #1 INT Disc Bus #2 Users Terminals Some components are suspicious, because if all of them work properly, something must be observed at users terminals Diagnosis desde la prespective de la Inteligencia Artificial 7
8 Which components remain suspicious? Console Terminal CPU MEM MEM Bus #1 INT Disc Bus #2 Users Terminals Since Console Terminal, CPU, MEM, MEM, Bus #1, DISC, and DISC have been exonerated, the only suspicious elements are INT, Bus #2, Terminals and Users Terminals Diagnosis desde la prespective de la Inteligencia Artificial 8
9 Model expansion Eliminate unlikely faults Console Terminal CPU MEM MEM Bus #1 INT Disc Bus #2... Users Terminals Users Terminals Users Terminals Representational change: part-of hierarchy It is very unlikely that all terminals fail identically. The failure must be located in a common area preceding terminals Diagnosis desde la prespective de la Inteligencia Artificial 9
10 Focus of suspicion INT Bus #2 T There are diagnostics programs to test this hardware! Diagnosis desde la prespective de la Inteligencia Artificial 10
11 Run diagnostics DIAGNOSTICS RESULTS TEST 6 EXPECTED AAAA 3333 F0F0 FFFF RECEIVED AAA F0F0 FFFD TEST 7 EXPECTED RECEIVED D TEST 8 EXPECTED 0A0A 0312 RECEIVED 0A Diagnosis desde la prespective de la Inteligencia Artificial 11
12 Understand Diagnostics We need to know 1. the intend of the test that encountered the error 2. the behaviour of the device responsible for the error In our example 1. send bit patterns back and forth from CPU and bus terminator 2. consider bus terminator as three registers Hypothesis ( that reasonably explain data ) bit#1 is dropped somewhere on the path from CPU to bus terminator Diagnosis desde la prespective de la Inteligencia Artificial 12
13 Where to probe? Test bit#1 path from INT to TERMINATOR another representation change (more detail) INT B7 C12 AF2 XCVR DATA 1 Signal reaches bus interface 3 bit#1 looses between bus#1 (pin B7) and bus#2 (pin C12) 2 bit#1 do not reach bus terminal new focus of suspicious B7, INT, C12 Diagnosis desde la prespective de la Inteligencia Artificial 13
14 Up to now... 2 changes of representation part-of hierarchy subsystem Tests diagnostics Probe Focus of suspicious (B7, INT, C12) Focus of attention (Bit#1 through INT) Another representation change... Diagnosis desde la prespective de la Inteligencia Artificial 14
15 Expand E4 B7 Gate Array XM EN 6 C12 assume wires OK gates arrays have a long time to failure EN, XM must be OK (diagnostics) check pin 6 of chip E4 Diagnosis desde la prespective de la Inteligencia Artificial 15
16 Reject assumptions E4 B7 Gate Array XM EN 6 C12 the signal is OK at pin 6! reject assumption: wires may be wrong shift representation: physical structure between pin 6 and C12 Diagnosis desde la prespective de la Inteligencia Artificial 16
17 Physical structure CHIP E4 pin 6 C12 Testing with a ohmmeter at both sides of the wire probes it is good! Diagnosis desde la prespective de la Inteligencia Artificial 17
18 A Contradiction? E4 6 EN C12 B7 Gate Array XM 6 The problem can not be explained with the electrical model More physical mechanical- detail is needed Diagnosis desde la prespective de la Inteligencia Artificial 18
19 Diagnosis Diagnosis: bent connector Diagnosis desde la prespective de la Inteligencia Artificial 19
20 Issues Diagnosis based on structure and function Utility of causal models Need for multiple, specialized representations Physical Electrical Abstract functional Strong focussing effect Structure -at several levels- Empirical associations experience, knowledge- Diagnosis desde la prespective de la Inteligencia Artificial 20
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