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Middleware Platform for Sentient Computing Applications

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Thirunavukkarasu Sivaharan, Maomao Wu, Gordon Blair, Adrian Friday, Paul Okanda. ... Integrated Production System, its internal implementation is based on RETE net. ... – PowerPoint PPT presentation

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Title: Middleware Platform for Sentient Computing Applications


1
Middleware Platform for Sentient Computing
Applications
Thirunavukkarasu Sivaharan, Maomao Wu, Gordon
Blair, Adrian Friday, Paul Okanda.
  • Computing Department,
  • Lancaster University, UK

2nd MiNEMA Closed Workshop_at_ Lancaster, 1st
Dec 2004
2
Overview of Presentation
  • Introduction
  • Sentient Objects
  • Research Challenges Component Frameworks
  • Middleware Architecture
  • Sentient Vehicle Demonstrator
  • Conclusions

3
Introduction(2)
  • EU FET Project CORTEX
  • Universidade de Lisboa (Portugal)
  • Lancaster University (United Kingdom)
  • Trinity College (Ireland)
  • Universität Ulm (Germany)
  • Aims
  • Middleware support for constructing distributed
    mobile proactive applications based on real-time
    sentient objects
  • Proposes sentient object model to support the
    construction of mobile, context aware,
    decentralised ,autonomus ,proactive and
    collaborative applications such as intelligent
    vehicles and smart buildings.
  • A middleware for networked embedded systems

4
Sentient Object Model(1)
  • Sentient Object Model
  • System consists of environment and a set of
    sentient objects
  • Sentient objects are capable of independently
    sensing the environment, derive context and infer
    autonomous actions
  • Sentinet objects communicate using event
    channels to establish higher level context and
    thus cooperate with each other

5
Sentient Object(2)
6
Autonomous sentient vehicle application in MANET
  • Autonomous navigation of vehicles from a source
    to destinations
  • Cooperating vehicles in MANET
  • Context aware vehicles

7
Some of the research challenges addressed
  • Suitable Communication Model for MANET
  • Routing in mobile ad-hoc environment
  • Context-awareness
  • End-to-End QoS and Fail safety
  • Run time and deployment time reconfigurations

8
Component Framework based Reflective Middleware
  • Publish-Subscribe Component framework (CF)
  • Multicast CF
  • Context CF
  • Resource Management CF

9
Why Component Framework based Middleware Platform?
  • Middleware is engineered as family of Component
    frameworks (CF) using Reflection and component
    technology
  • Each CF addresses specific research areas
  • Component Frameworks are highly configurable and
    dynamically reconfigurable (with the granularity
    of a component)
  • Clear separation of concerns
  • Adaptable to diversity of CORTEX applications
  • Reduction of memory footprint
  • CFs are implemented using Lancasters OpenCOM
    reflective component technology

10
Middleware Architecture
Sentient Objects
Sentient Objects
Context CF- Sensor Fusion Inference Engine
M I D D L E W A R E
Programming Interfaces
Publish-Subscribe CF- (for MANET)
Timely Computing Base
Group Communication CF-( Ad-hoc Multicast )
Payload Channel
TCB control channel
WLAN 802.11b (ad-hoc), Windows CE
Middleware Configuration for MANET
11
Publish-Subscribe CF(1)
  • Communication model inspired by STEAM
  • Implicit event model
  • Sender receiver based event filtering
  • Subscription Language supports subject, content
    context based event filtering
  • Supports distance based context filtering
    extensible to other contexts
  • XML based generic events
  • Events transported via selectable Multicast
    protocol

12
Publish-Subscribe CF(2)
13
Multicast CF
  • Underlying event Routing Protocol is based on
    multicast
  • The multicast protocol for ad-hoc networks is a
    probabilistic, stateless and multi-hop protocol
  • We offer this service in the form of a component
    framework.

14
Context CF (1)
  • Sensor capture and fusion
  • Multivariate Gaussian modelling
  • Bayesian networks
  • Dead-reckoning
  • Inference engine
  • A program that reasons about a set of rules (a
    knowledge base) in order to derive an output.
  • The knowledge is encoded as a set of production
    rules, contexts are represented as fact.
  • CLIPS C Language Integrated Production System,
    its internal implementation is based on RETE net.

15
Context CF (2)
  • CLIPS rule sample
  • The paradigm facilitates uniform treatment of
    both context and QoS
  • Rules to trigger adaptations and actuations based
    on changes in measure of QoS data
  • CLIPS DLL and OpenCOM component for WinXP and
    WinCE

(defrule rule-obstacle-near "CLIPS rule for
obstacle near" (car-id (id ?id)) ?f1 lt-
(obstacle (distance near)) gt (retract
?f1) (publish ?id stop) )
16
End-to-End QoS Management and Fail Safety-
Timeliness requirement
  • How can this be achieved?
  • Enforcing timely perceptions of the environment
    and timely actuations on it.
  • Which means timely event delivery and awareness
    of QoS of the event channels used for
    inter-sentient object communication
  • The key issue in uncertain and highly dynamic
    environments is that timing bounds for
    distributed actions may be violated because of
    timing failure

17
End-to-End QoS Management and Fail
Safety-Timeliness Requirements
  • We model the uncertainty of timely event
    dissemination via event channels using a
    dependable timing failure detection service.
  • This service is provided by University of
    Lisboas Timely Computing Base (TCB)
  • TCB facilitates to construct distributed event
    channels with timing bound specification
  • This enables publisher or subscriber to be aware
    of the timing failures of event channels
  • Thus providing awareness of timing failure
    probability for a given required coverage
  • Fail safety is achieved by switching to fail-safe
    state as soon as QoS specifications are violated.

18
Autonomous Sentient Vehicles Demonstrator
  • Two Sub problems
  • Cooperative behaviour without human control
  • Autonomous vehicle navigation from a given source
    to pre-determined destination
  • Vehicles Objectives
  • Travel along a given path( virtual circuit-VC)
    defined by set of GPS waypoints and bearings.
  • Every vehicle that travels on the VC cooperate
    with other vehicles to avoid collisions and
    travel safely
  • Obey external roadside traffic lights.
  • Give way to pedestrians who cross the road.

19
Location aware Cooperating Sentient Vehicles
Satellites
Car publishes on Carcontrol channel Event
Packet ltcar status, Locationgt
Car publishes on Carcontrol channel Event
Packet ltcar status, Locationgt
Car subscribes to CarControlChannel Receives
events from other cars
Car subscribes to CarControlChannel Receives
events from other cars
IEEE 802.11b(ad-hoc) ---Event Channel---CarControl
Channel
Car A
Car B
4m
OC CLOSE( 4m)
OC BEHIND
OC FAR(4- 10m)
OC VERY FAR
OC BEHIND
OC CLOSE
Other Cars location context w.r.t Car B
Other cars location context w.r.t car A
OC Other car
20
Pedestrian detection
  • Obstacle Sensing Service Consumes raw
    ultrasonic sensor data and fuses using a suitable
    algorithm (reliable, timely-unreliable, Gaussian,
    ) to derive higher level obstacle distance
    context such as NEAR , FAR , NOOBJECT.

21
  • Example The Car Sentient Object Context CF

Speed Actuator
Ultrasonic sensor
Steer Actuator
GPS sensor
Consume
Produce
Sentient object
Sentient object
Digital Compass sensor
Interface
receptacle
22
Sentient Vehicle Test Bed
23
Contd
24
Contd
25
  • Demo Settings

26
Waypoint 3
Waypoint 2
Traffic Light
Waypoint 4
Waypoint 1
Virtual Circuit
27
Demo Video
28
Concluding Remarks
  • The sentient object model
  • has proved to be valuable programming
    abstraction for the development of real-time,
    cooperative, context-aware applications.
  • The component-Framework based Middleware approach
  • offers benefits of flexible configuration and
    reconfiguration of the middleware components
  • The middleware architecture
  • also provides the management of non-functional
    concerns such as timeliness and reliability
    properties.
  • Our middleware is reusable
  • we are keen to investigate the generality of our
    approach by applying our middleware to other
    application domains involving embedded autonomous
    components.

29
Thank You
  • Questions
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