Transcript Collaborative Portals for Education and Computing

Information Technology for
Hall D Experiment
Building the Digital HallD
Geoffrey Fox
Florida State University
Department of Computer Science and
CSIT (School of Computational Science and Information Technology)
400 Dirac Science Library
Tallahassee
Florida 32306-4130
[email protected]
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What is a Portal
• It is a “just” a web-based application
• Education Portal is a Web-based University
• Computing Portal is a “Problem Solving
Environment”
• Goal to build more productive environments by
integrated access to distributed resources
• From a Java point of view, one can view them as
“Frameworks for Computing” or “Frameworks
for Education” respectively
• Well defined Interfaces based on
– Grid Forum -- Computing
– IMS/ADL/IEEE LTSC -- Education
• And a set of Services and Tools
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Commodity Portals are Web Interfaces
for Consumers
Yahoo, NetCenter, Amazon.com, Ebay.com etc. are portals for
e-commerce, news etc.
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Basic Portal Architecture and Inter Relationships of
Education, Computing and other Portals
Enterprise
Information
Portals from
Merrill Lynch
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Hierarchy of Portals and Their Technology
Generic Portals
Collaboration
Universal Access Generic Services
Security …….
Portal Building Tools and
Frameworks (XUL, Ninja,
iPlanet, E-Speak, Portlets,
WebSphere, www.desktop.com)
User customization,
component libraries,
fixed channels
Information Services
Databases …….
Enterprise Portals
Quizzes Grading ...
www.computingportals.org
Education Services
Education and
Training Portals
Compute Services
Grid Services
Visualization ...
MathML etc
Science Portals
……...
……...
K-12
University
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Biology
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Chem Egy
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Services in Computing Portals
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Security
Fault Tolerance
Object Lookup and Registration
Any
Object Persistence and Database support (as in EIP’s)
Portal
Event and Transaction Services
Collaboration among scientists around world
Job Status as in HotPage (NPACI) and myGrid (NCSA)
File Services (as in NPACI Storage Resource Broker)
– Support (XML based) computational science specific metadata like
MathML, XSIL
Visualization
Programming
Application Integration (chaining services viewed as backend compute
filters)
“Seamless Access” and integration of resources between different
users/application domains
Parameter Specification Service (get data from Web form into Fortran
program wrapped as backend object)
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Portals think of things as objects and services
System View
User View
Rendering
Engine
XML
CORBA
or Java
Broker or
Server
Browser
(HTML)
Rendering
Engine
Objects
XML Request
for service
followed by
return of XML
result
Universal Interfaces
IDL or XML
“Computing Portals”
Interface
www.computingportals.org
“Grid Forum”
Interface
www.gridforum.org
Community
enhancing interoperability
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Seismic Sensors
Geophysical
“Web” Info
Field Data
Backend Services
Databases
Middleware
Bunch of
Web Servers
and Object
Brokers
Clients
(HPCC) Computers
Collaboration
Security
Lookup
Registration
Agents/Brokers
General
“Web” Info
Application Integration
Visualization Server
Seamless Access
(Java) Interactive Analysis
Client Visualization
GEM (Earthquake Science)Portal Architecture
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Caltech
ALARM
WAKE UP!
page
quake location, size --
disp
JPL
WAKE UP!
page
disloc
sorted station potential -Dial Stations(and database)
USGS
modem
station raw files -page
GIPSY/auto_p
station motions --
JPL
JPL
disloc
simplex
multi-fault
model
Boulder
WAKE UP!
JPL
--maps for
civil authorities
single-fault
model
Virtual_California
(University of
Colorado)
--graphics
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JPL
collaboration
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web simplex
--graphics
--refined fault model
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Collaboration in GEM
Earthquake Analysis System
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Example: LMS
NCSA Alliance
General or WebFlow
Specific Authoring
Prototype Version
Example: DoD HPCMO ASC/ARL
Different Computing Paradigms Layered
PSE
WebFlow
Object
Oriented
WebFlow
Data
Flow
Custom
GUI
https, IIOP/SECIOP
Computing Portal portalML
Task Spec.
WebFlow Middle Tier
Middle-Tier
Grid Forum API(resourceML)
Resource Spec.
HPCC: Globus
DBMS: JDBC
Small tasks: Java
user codes
Control
(Small
Messages)
Separated
from Data
Other as needed
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Digital HallD Ground Rules
• Distributed Objects
– Define all programs and data as objects – define in XML and
implement in Object Model de jour (CORBA, Java, COM,
SOAP …)
– Do not use an Object Database
– All HallD objects are labeled “HallD” and use a Jini like
mechanism to announce their existence to a net of HallD
brokers
– HallD brokers allow a Napster-like mechanism for
distributed systems to export HallD objects for external
access (with built in rules)
• Assume everybody has wireless access to the “Digital
HallD” through hand held and conventional computers
• Moore’s law:Computer Performance increases by a factor
of 2 every 18 months
• Gilder’s Law:Network bandwidth triples every 12 months maybe easier to use scattered resources as no cost in sending data?
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Digital HallD Technologies
• Globus allows you infrastructure to access
computer resources around the world forming a
HallD Grid
• Maybe you don’t need Globus as the “real world”
might provide what you need – several startups
addressing issue of harnessing idle computer time
• Use a multi-tier software architecture separating
resources, servers/brokers, display engines,
display devices
• Structure access to Digital HallD as a Portal
• Do not write any HTML – use XML and convert
• Program in C++ or Java
• Need distributed and not parallel computers
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MyHallD Collaborative Portal
• MyHallD is the portal door to the
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Virtual HallD Experiment Control Room
Virtual HallD Monte Carlo Farm
Virtual HallD DST Factory
Virtual HallD Physics Engine
Virtual HallD Board Room
HallD Education and Outreach Area
• These share access to HallD digital objects but
access (and make) them in different ways and are
optimized in different ways
• They share certain features and services
– All actions are logged (in XML) and archived
– Common security infrastructure
– Access can be from PC or Hand Held device
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Message Center Interface
• Yahoo Messenger is an
interesting model for a portal
interface
• Application that invokes
browser – more robust than
browser
• Runs on PC or Palmtop and
“only” contains summary
information suitable for Palms
• Has services like file
manipulation, send a message
and set of custom buttons
– Access News, Weather, Stocks etc.
• Develop “HallD Messenger” as
control centers for HallD
functions
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Features of MyHallD and it’s
HallD Virtual Places
• MyHallD would have:
– “Handles” to open 6 Community Virtual Places as well
as ability to open private virtual rooms
– HallD/Jefferson/HEP Calendar, Phone lists etc.
– News Items with browser links
– Experiment Status etc.
– Invoke basic Collaboration Tools – Internet Phone;
Local and remote cameras; Chat; Whiteboard
– Automatic Update (to myHallD) Feature
– Indicator as to which places you are in and who else is
active there.
– To do list for you in HallD
– Gentle and Crass ways of getting people’s attention
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What’s Involved in MyHallD?
• Probably needs some money but < $30.9442
• Commitment to use the “HallD Digital Object
Framework”
• Basic functions are available in existing commercial
systems; start to use these and to prototype some of the
special capabilities needed
• What is involved in making HallD objects collaborative?
First use objects and then we have choices – which vary in
ease of use and functionality.
• First we discuss Collaborative Objects in general
– These are particular digital objects shared by more than one
people
– Best known is asynchronous sharing: you create/modify an
object. Others access it at a later time
– Synchronous Collaboration involves real-time updates of
objects being shared by several people in distributed
locations
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Features of Virtual MyHallD Places
• HallD Board room can be done today for some capabilities
using WebEx Placeware or Centra
• DST Factory and Monte Carlo Farm do not require
significant synchronous collaboration; build computing
portals for standard HENP packages
– Need strong management functions
• HallD Physics Engine could benefit from innovative user
interfaces and collaboration in analysis of results
– Here is where difficult decisions made (how to run
Minuit) and distributed experts could be useful
– Share analysis results and choice of parameters for
future large analysis (which partial waves to include)
• HallD Education and Outreach can use Virtual
Classroom model being developed by several
vendors
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Typical Virtual Classroom
• Centra, Placeware, WebEx, Anabas ….
Control buttons for Audio/Video/Floor Control etc.
Lecture Page
Annotations
(student, teacher)
Pointers etc.
index
Alert/
Raise Hands
Invoke Quiz
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Chat Room
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Features of Virtual MyHallD Places
• Virtual Experiment Control Room could be a big
win as (unexpected) real-time decisions need
“experts-on-demand”
– I have proposed this model to NASA for remote
spacecraft mission control and real-time scientific
analysis of earthquakes
– Needs to evaluate collaborative decision making (vote?)
and planning tools
– Needs to allow shared streaming data as well as shared
read-outs of experimental monitors (output of all
devices must be distributed objects which can be
shared)
– Needs to support experts caught on their sailboat with
poor connectivity or in their car with just a cell phone
and a PDA
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Techniques for Collaboration I
• Shared Display: One object and share “frame
buffer” produced by this object
– Can modify (resolution of) frame buffer to customize
for each client
– Clever algorithms to only send “updates” to frame
buffer as object rendering changes
– Can trap user interactions (mouse, keyboard) on any
client
– Microsoft NetMeeting and public domain VNC well
known examples of this
• Collaboration Server Sends messages between
clients to replicate frame buffer and trapped user
interface events
• Technology base for “customer help” systems
– Expert in Seattle sees your screen and can click mouse
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Techniques for Collaboration II
• Shared Event: Separate copies of application
(object) for each client and collaboration server
exchanges events that record “changes in state” of
“master object”
• E.g. Shared Web Page:every client runs a separate
browser and one “just” sends the URL to record
state change
• Low message volume and can customize
– E.g. if one client is a palmtop, one “automatically”
modifies URL sent by PC to access WML version of
web Page optimized for small devices
– In collaborative visualization, can share image but each
client can chose viewpoint
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Persistent Store of
Shared Courseware
Events, User Info
Data
base
Data
base
Collaborative Portal
ResourceML
Asynchronous
Archive and Access
Store
Local Event Queue
User Specific
Session Logic
Personal
Server
Web
Page
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Real time Share
Synchronous Lesson
“Client”
HTML WML W3C WAI
Rendering Standards
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PortalML
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Collaborative University Network
Assessment
Feedback
Collaborative
University
Network
Learning
Instance
managed by
one university
Delivery
Teaching
Mentoring
Learners
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Education Specific Portal Support I
• Administrative Structure
– degrees, departments, lecturers, Deans ...
• Performance (grading) information
• Homework submission
• Quizzes of various types (multiple choice, random
parameters)
• Assessment data and an analysis
• Hierarchical Curriculum structure from document
fragment to page to lecture to course
• Napster/Gnutella type distributed information system
with personalized dynamic collections (analogy
between CDROM of pirated music and dynamic
lectures/personal info resource as in RealJukebox)
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Education Specific Portal Support II
• Glossaries with a middle tier glossary service to
automatically link glossary entries to document
fragments
• Student Annotations
• Synchronized Multimedia Integration Language
(SMIL) enables simple authoring of TV-like
multimedia presentations such as training courses on
the Web
• SVG, VML X3D etc. for pictures
• MathML Mathematical Expressions
• Agent type support for “Computer
Tutor/Learning Management System”
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