Date post: | 19-Aug-2015 |
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Technology |
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John K.S. Lau & C.K. Tham & T. LuoE-mail: {elelksj, eletck, eleluo}@nus.edu.sg
Participatory Cyber Physical System in Public Transport
ApplicationIEEE/ACM UCC’11 International Workshop of Cloud Computing and Scientific Applications (CCSA 2011)
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 2
Motivation
•How to enrich travel experience thereby increase public transport ridership?• How to obtain data if transit agencies are either incapable or reluctant?
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 3
Contributions
•ContriSenseCloud–Participatory cyber physical system.
•ContriSense:Bus–Application on ContriSenseCloud.–Application on Android smartphones.
•RESTful API–Data as a service.
•NTRS and S2B algorithms–Complements GPS trajectory database and MATE
algorithm.
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 4
ContriSenseCloud Architecture
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 5
ContriSense:Bus Architecture
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 6
Cyber Physical Society
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 7
RESTful API
http://example.com/xchange/api/view/1
http://example.com/xchange/api/view/1/5
http://example.com/xchange/api/view/1/5/2
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 8
NTRS and S2B Algorithms
NTRS
GPS Trajectory Database
MATE
S2B
Real World
Us
RESTful
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 9
User-contributed Traces
LegendBalloon – Bus stop (node)Red line – Actual Green line – Mapped
NUS D1/D2 95
190 196
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 10
Services in ContriSense:Bus
XML
JSON
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 11
Performance MeasurementsLa
tenc
y (s
)
No. of travel time queried
Late
ncy
(s)
No. of concurrent users (queries)
No. of concurrent users (API calls)
Late
ncy
(s)
Late
ncy
(s)
Participatory Cyber Physical System in Public Transport ApplicationJKS Lau, CK Tham, T Luo 12
Future Works
• Integrating closed-loop incentive scheme for supply and demand valuation.• Improving S2B algorithm so that Kmax and Kmin are adaptive.• Introducing load balancing for higher scalability.