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research:projects:vanderlande:the_performance_spectrum [2018/10/30 10:41]
dfahland
research:projects:vanderlande:the_performance_spectrum [2018/10/30 12:56] (current)
dfahland [Performance spectrum explained: performance of baggage check-in lines]
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 One of the core challenges of process analytics from event data is to enable an analyst to get a comprehensive understanding of the process and where problems reside. ​ One of the core challenges of process analytics from event data is to enable an analyst to get a comprehensive understanding of the process and where problems reside. ​
    
-In business process mining such an overview is obtained with a process map. The process map is a graph that can be discovered from event data and be visualized in a graph where nodes show process steps and edges between nodes show the flow in the process ​ +In business process mining such an overview is obtained with a process map. The process map is a graph that can be discovered from event data and shows process steps as nodes and the flow in the process ​as edges that highlight deviations and bottlenecks. ​
-and highlight deviations and bottlenecks. ​+
  
 Process maps of data of logistics processes do not give these insights: they are too large to comprehend, the maps do not visualize how processing of materials influences each other, and - as they show an aggregate of all event data - they fail to visualize how performance and processing varies and changes over time. Process maps of data of logistics processes do not give these insights: they are too large to comprehend, the maps do not visualize how processing of materials influences each other, and - as they show an aggregate of all event data - they fail to visualize how performance and processing varies and changes over time.
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 As bags cannot overtake each other on a conveyor belt, we can immediately identify in the performance spectrum several behavioural patterns: As bags cannot overtake each other on a conveyor belt, we can immediately identify in the performance spectrum several behavioural patterns:
-  * Normal operations, for example in the left part of the performance spectrum, show how bags flow tougher ​from the check-in points to point s, each segment having its own speed, and no bags are overtaking each other. ​+  * Normal operations, for example in the left part of the performance spectrum, show how bags flow together ​from the check-in points to point s, each segment having its own speed, and no bags are overtaking each other. ​
   * Repeated operational problems can be seen in the segment a2:a3 (orange-slanted lines) where the conveyor belts are halted for a certain period, leading to significantly delayed processing, to no flow in segments a3:a4 and a4:a5, and to backwards queuing in segment a1:a2, while segment a5:s is unaffected as the bags coming from a5 can move freely. ​   * Repeated operational problems can be seen in the segment a2:a3 (orange-slanted lines) where the conveyor belts are halted for a certain period, leading to significantly delayed processing, to no flow in segments a3:a4 and a4:a5, and to backwards queuing in segment a1:a2, while segment a5:s is unaffected as the bags coming from a5 can move freely. ​
   * After the short-term performance problems are resolved, the system shows recovery behaviour under high-load as the system resumes to normal operations, visible by a large number of bags (many lines close together) moving two times slower than normal (light blue).   * After the short-term performance problems are resolved, the system shows recovery behaviour under high-load as the system resumes to normal operations, visible by a large number of bags (many lines close together) moving two times slower than normal (light blue).