Lecture 4 Conceptual System Design - PowerPoint PPT Presentation

1 / 37
About This Presentation
Title:

Lecture 4 Conceptual System Design

Description:

... Systems Engineering. Lecture ... Industrial & Systems Engineering. Agenda. Review System ID Scope and ... accessed by pedestrian, automotive, or desk based ... – PowerPoint PPT presentation

Number of Views:375
Avg rating:3.0/5.0
Slides: 38
Provided by: AFDiv2
Category:

less

Transcript and Presenter's Notes

Title: Lecture 4 Conceptual System Design


1
Lecture 4 Conceptual System Design
Introduction to Functional Allocation ISE 222
Spring 2005Notes Course Materials
www.engr.sjsu.edu/kcorkerKevin.Corker_at_sjsu.edu
  • Kevin Corker
  • San Jose State University
  • 2/10/05

2
Agenda
  • Review System ID Scope and Bound Process
  • Complete the IDEF and action based costing
  • Preliminary Design Review Process
  • Introduction to Human Factors
  • Review Homework (with individuals and teams)

3
Identification of Need
  • Gap
  • New Techniques
  • New System Requirements added
  • System Requirements Change Priority
  • Political Views Shift
  • Involve the customer unless the customer has
    changed as well

4
System Definition MatrixNational Identity
Confirmation Process
Scope
Bound
Needs
Objt
Criteria
Params
Var
Constrnt
5
National Identity Confirmation ProcessNeeds
  • Ability to determine the identity of individuals
    in this country
  • quickly
  • at any place or time
  • to assure accuracy of identity information
  • to assure privacy and security of individuals
    identity

6
National Identity Confirmation ProcessObjectives
Criteria
Parameters
  • To institute a national identification process
  • Portable and reliable
  • To provide appropriate authorities with
    information
  • Name
  • Address
  • Visa/citizenship status
  • Criminal Information
  • Health Information
  • Contact and NOK (next of kin) Information
  • Tracking???
  • Able to be carried on or in person
  • whgt,lt 4 oz
  • Volume lt 2 cubic centimeters
  • Able to be accessed by pedestrian, automotive, or
    desk based systems
  • Able to link to national information sources
  • Wireless access range
  • Access queue management
  • Bandwidth

7
To provide appropriate authorities with
informationObjectives
  • Easy access
  • Time to access
  • Encumbrance fro access
  • Voluntary or not access process
  • Validation of data

8
National Identity Confirmation ProcessObjectives
Criteria
  • To secure ID from tampering or duplication
  • To secure ID from un authorized access
  • To keep all information current
  • Sealed no remote access
  • Access limited
  • Update Rate compatible with National Standards
  • Update per week??

9
Alternatives
  • A1 Hand carried ID with federal specification
    and on board storage
  • A2 Bio-referenced ID for identity with link to
    data store for other information
  • A3 Implanted RF-ID with data on board and with
    link to data store for other information

10
Secure
All Environ access
Lightweight
Accessible for mods
11
Implanted
Hand Held
Bio-ID
Asynchronous Constant Update
Full Cross Index
Wireless Data Base
1
Privacy
Public
1
Security
2
Accuracy
3
Convenience
Access Ease
1
Authorities
Info Density
11
2
Info currency
3
Priority
12
Functional Analysis and Allocation
13
Action Reference Framework
  • To (do something) to (something) somehow
  • Action , object, modifier
  • Used to describe a process
  • Functional Decomposition is to develop a
    description of what the system must do not
    necessarily tied to how the system must do it.

14
Functional Flow Block Diagram
Boolean Operator
15
Hierarchic Structure for Decomposition
  • Sub Functions operate on input/output consistent
    with the higher levels of the hierarchy
  • Models the flow of data or objects in a system

16
ICOM
Control
Activity
Inputs
Outputs
Mechanism
17
Method of Analysis
  • Shows roles of information and materials with
    respect to activity
  • Each ICOM represents an activity or business step
    that can be broken down
  • Inputs information/material used to produce
    activity output
  • Controls Constraints on an activity
  • Mechanisms That perform processing or provide
    energy to the activity (people or machines as
    mechanisms)
  • Output The product of the activity

18
Context Diagram
Control
Activity
Inputs
Outputs
A0 Purpose Viewpoint
Mechanism
19
Target OOB
Procedures
Procedures
Sight Designate Target
orders
Expected Result
Select Prepare Ordinance
Ordinance Inventory
Guidance Equip
Deliver Ordinance
Access Damage
Captain
Automation
Gunner
Gunner
Automation
Captain
20
Steps in Functional Decomposition
  • Develop Context Diagram of Full System
  • Decompose System to Sub-elements (ICOMS for all)
  • Define Business Rule/Model
  • AS-Is the descriptive scenario
  • To-Be the future business or process model
  • Cost Analysis
  • Analysis of activities,
  • Gather costs,
  • Trace costs to activities,
  • Establish output measures,
  • Analyze costs

21
Provision Aircraft Primary Secondary Input costs Output Measures
Propulsion Jet Fuel Fueltrck ops (150,000) (10,000) Passenger-revenue miles (80800)/1000
Fire control (1,000)
Life support Oxy, meds, safety equip Flight attend training (10,000) (2,000) Certification freq
Inspection (1,000) Certification freq
Safety Instructions Production/distribution (500) Certification freq
Lights, belts , etc ( Installation/maintenance (500) Certification freq
Quality of trip Food (d) Preparation (5,000) Meals produced/ meals consumed
Storage (5,000)
Heating/Cooling Galley (5,000)
Distribution (2,000)
Blankets/pillows (d) (100) Passenger requests

In-flight entertainment (d) (250) Hours of use
22
(No Transcript)
23
(No Transcript)
24
Steps/Perspectives for System EngineeringAnalysis
  • System Analysis
  • Identification of the impacts and consequences of
    alternative approaches to system solution
  • Identification of the quality, market,
    reliability, cost, effectiveness, benefits,
    longevity, aesthetics of alternative system
    solutions
  • Iterative Refinement of Alternatives
  • Sensitivity Analysis and Parameter Identification

25
Supportability
  • Inherent Characteristics of system design
    installation that enable efficient maintenance
    and support of the system
  • Prime Elements
  • Design Reliability Quality and Maintenance
  • Maintenance Infrastructure
  • Maintenance
  • Training
  • Supply chain support
  • Equipment
  • Packaging
  • Faculties
  • Technical Data

26
Preliminary Design Review (due 2/17)
  • Identify design alternatives (at least 2)
  • for functional capability
  • support reliability
  • allow for maintainability
  • Usability safety
  • Support for service

27
Human Factors Introduction
28
Systems Engineering Approach to HCI
Features Automation
29
Motor Behavior Theory for Guidance in Design and
Selection of Input Devices
  • Purpose to match a physical output on the part of
    a user to a signal that is recognizable by a
    system.
  • Bandwidth range of expression
  • Dynamics speed of response
  • Dimensionality physical and temporal relations
    that the input device can support
  • Affordance appropriate and expected response
    in use and in feedback
  • E.g. button click or highlight changes in
    isotonic devices
  • Discrete entry devices and Continuous entry
    devices
  • Physical limits
  • Ergonomic consideration
  • Environmental impacts vibration, clothing
    restrictions, noise and etc.
  • Physical Measurement, information theory and
    neuromotor accuracy

30
Human Performance Models
  • What are they?
  • Expressions of relationships that either describe
    (descriptive) or predict (normative) human
    behavior across a range of environments or
    contexts
  • Specifics
  • Perceptual Models, Information Processing Models,
    Motor Behavior Models, Decision Models, Framework
    Models, Unified Models.

31
(No Transcript)
32
INFORMATION MEASUREMENT
  • Information property of messages and data or
    other evidence that reduces ones uncertainty
    about the true state of the world.
  • Let x represent a hypothesis about the state of
    the world
  • Let y represent the observation that has a
    relation to x
  • I(xy) is the relation of the observation to the
    state of the world
  • I(xy) should be a function of the prior
    probability of x before y is observed and the
    posterior probability of x after y was observed
    F p(x), p(xy)

log2 P(xy)/p(x)
33
Information Qualification
Loss
Input
Output
Noise
34
Information Qualification
What Effect does redundancy have on total
information transmission?
H
Loss
H(x)
H(y)
T(x,y)
Input
Output
Noise
C (bits/sec) bandwidth log2 (signal/noise1)
35
H(x)
H(xy)
H(yx)
H(y)
36
Hicks Law
Reaction Time
RT a b H(x) where H(x) log2(n)
.8 sec
.6 sec
.4 sec
.2 sec
1 2 3
4 5 6 7
8
Bits 1 2
2.58 3
37
Fitts LawMovement Time ab(Id) Id log2
2amplitude/(tolerance)
Movement time
.8
.6
.4
.2
Id 1 2 3 4
5 6 7
Write a Comment
User Comments (0)
About PowerShow.com