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Real Time Systems: Train Gate System II

Real Time Systems: Train Gate System II. Chieu Wang Vincent Ng. Current System. A unidirectional railway track that crosses a one way road. A single gate at the crossing which may be lowered or raised under the control of a computer.

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Real Time Systems: Train Gate System II

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  1. Real Time Systems:Train Gate System II Chieu Wang Vincent Ng

  2. Current System • A unidirectional railway track that crosses a one way road. • A single gate at the crossing which may be lowered or raised under the control of a computer. • There are two sensors present to detect incoming and outgoing trains.

  3. Current System Entry Sensor Exit Sensor Gate

  4. Processes • Se – represents the entry sensor. • Sl – represents the exit sensor. • G – represents the gate. • M – the monitor that keeps track of the number of trains in the area. • C – controls the gate.

  5. Se Sl G C Train Gate CRSM Communication Diagram tr trout trin gok og cg M cont_og cont_cg

  6. Proposed Modifications • Change to a two track unidirectional railway that crosses over a two way road. • Model will include two gates at the crossing which may be lowered or raised that is under the control of a computer.

  7. Proposed Modifications, Con’t • There will be four sensors in the system: • Two sensors for each track to detect incoming and outgoing trains.

  8. Train Gate System II Entry Sensor 2 Gate 2 Exit Sensor 2 Entry Sensor Gate 1 Exit Sensor

  9. Details of Proposed Modifications • Se2 – represents the entry sensor on second track. • Sl2 – represents the exit sensor on second track. • G2 – represents the second gate.

  10. SE2 SE1 SL1 G1 M C SL2 G2 Train Gate II CRSM Communication Diagram tr gok trin tr 2 trout og cg trin 2 cont_og2 cont_cg2 cg 2 og2 cont_og trout 2 cont_cg gok2

  11. Train Sensore Monitor Controller Gate Sensorl Sensore1 Sensore2 Sensorl1 Sensorl2 Gate1 Gate2 Recommended Implementation and Modeling

  12. Train SE1 SE2 M C G1 G2 SL1 SL2 Simplified Modeling Version

  13. Advantages • Existing classes does not need to be modified. • ie. sensore.java, sensorl.java, gate.java • Existing classes are easily cloned for reuse. • Existing timing constraints can be applied to the new classes.

  14. Disadvantages • The monitor and controller process require substantial modifications to handle the new classes. • Issues with sequence of processing.

  15. Difficulties Encountered • The monitor and controller class required major overhaul to accommodate multiple events that may occur at the same time.

  16. Conclusion • The modified system will provide a more realistic model of a train gate system. • By incorporating multiple tracks and sensors, the model will further reinforce the basic concepts of concurrency and synchronization among processes

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