Software Abstractions and Architectures

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Software Abstractions and Architectures
Evaluating the Performance of Distributed
Synchronous Collaboration Architectures
User-Interface Generation for Mobile and Desktop
Computing

• Prasun Dewan

Collaborative Mixed-Initiative Access Control
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Collaborative Mixed-Initiative Access Control
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Access Control

• Controls access to your information
• Your documents
• Information about you
• Your activity on the computer

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Problem?

• In theory, No (Lampson 71)
• Controls can be provided to protect any command
• Access matrix of subjects, objects, and rights

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Problem?

• In practice, Yes
• Overhead of making access control specification

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Problem?

• In practice, Yes
• Overhead of making access control specification
• Increases as additional kinds of information
  shared
• E.g. Facebook

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Current Situation What People Do

• Users typically use
• defaults
• coarse-grained control (completely public/private
  shared items)

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Current Situation What People Want

• User-specific (Olson, Grudin, Horvitz 05)
• In progress work
• Object-specific Control (Olson, Grudin, Horvitz
  05, Palen Dourish 03)
• Work telephone vs. social security
• Task-specific
• Social security number for NSF proposals

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Desire vs. Enforcement
Effort
Flexibility
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Desire vs. Enforcement

• Mixed-Initiative Access Control
• Many hands instead of one.
• Automation/agents.

Effort
Flexibility
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Traditional vs. Mixed-Initiative
Consumer
Consumer
File System
Agents
Agent
Calendar
Machines
Workspace
Traditional AC
Presence
Web Portal
Web Portal
Guardian
Protected Objects
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Protecting the Proposal Folder
Information Guardian
Information Consumer
Create
Alice
Access File
Proposal Alice, Bob, Cathy
Bob
Alice
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AUTOMATIC RIGHTS DEDUCTION
Information Guardian
Information Consumer
Rights Requested
Create
Alice
Access File
Proposal Alice, Bob, Cathy
Bob
Alice
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Guardian Just Makes Decision
Information Guardian
Information Consumer
Rights Requested
Grant
Create
Alice
Access File
Proposal Alice, Bob, Cathy
Bob
Alice
Bob
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Guardian Agent Recommends
Information Guardian
Information Consumer
Rights Requested
Grant
Recommend Cathy
Create
Alice
Access File
Proposal Alice, Bob, Cathy
Bob
Alice
Bob
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Example
Information Guardian
Information Consumer
Rights Requested
Grant
Recommend Cathy
Create
Alice
Access File
Proposal Alice, Bob, Cathy
Bob
Alice
Bob
Cathy
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Architecture
Communication Servers
Send Receive
Send Receive
Access Right Descriptions Object User
Relationships Preferences Rules Interaction,
Communication, Request Grant Histories.
Communication Clients
Communication Clients
Request Access
Access Requests
Request Result
Access Results
Read
Read
Access Result
Grant
Manual Grant
Access Fault
Manual Request
Consumer
Guardian
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Symbiotic Relationship between Access Control and
Collaborative Systems

• Implementation?
• Real Scenarios?
• Usability?
• Formal Semantics?
• Performance?

Collaborative Systems
Protection Problem
Solution
Access Control
Solution
Rights Distribution Problem
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User-Interface Generation for Desktop and
Mobile Computers
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Implementing Interactive Applications
Interactive Application
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Implementing Interactive Applications
Interactive Application
I/O Routines
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Implementing Interactive Applications
Interactive Application
Service
User Interface
Library
Toolkit
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Implementing Interactive Applications
Interactive Application
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Implementing Interactive Applications
Interactive Application
Mobile GUI
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Implementing Interactive Applications
Interactive Application
Speech UI
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Integrating Web and Desktop interfaces

• Unite
• GWT
• AWT/Swing
• Design Patterns, Distributed, Architecture and
  Performance Issues

Interactive Application
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Automation
Interactive Application
Desktop/Web/Mobile GUI/SUI
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ObjectEditor
Comp 110 Assignment
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Flexibility with Automation

• Provide an interactive model-based builder
• Speech UIs

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Performance of Distributed Synchronous
Collaboration
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Response Times
time
Various user see the output for the input command
User enters an input command
Move piece
Piece moves
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Factors

• Network latency and processor speeds
• Think time between user input
• Scheduling policy
• Peer to peer vs. client-server architecture
• Unicast vs. multicast
• Screen vs. model sharing

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Positions
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Positions Available

• Up to 3 New Students
• Ph.D. and Masters

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What is Research?
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Which is Research?
IPHONE
VISTA SIDEBAR
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What is Research?
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What is Research?

• Not just a new artifact
• A new technical argument
• Survey prerequisite
• Comp 911/790-063 How to make a new technical
  argument.
• Writing
• Presentations
• Surveys and optionally new results
• TAs/RAs can both take the course

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Extra Slides
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Access Fault
Consumer Agent
Protected Object
7. Result
6. Access Object
Page Fault
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Iphone as research
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Software Abstractions and Architectures
Evaluating the Performance of Distributed
Synchronous Collaboration Architectures
User-Interface Generation for Mobile and Desktop
Computing

• Prasun Dewan

Collaborative Mixed-Initiative Access Control
44
Software Abstractions and Architectures
Evaluating the Performance of Distributed
Synchronous Collaboration Architectures
User-Interface Generation for Mobile and Desktop
Computing

• Prasun Dewan

Collaborative Mixed-Initiative Access Control