Logo blue background.png

Bruce Powel Douglass, Ph.D.

  • Content

    • Resources
    • Embedded World
    • Papers
    • Presentations
    • Models
    • Harmony aMBSE Overview
    • Harmony aMBSE Functional Analysis
    • Harmony Embedded Software Overview
    • Harmony ESW Nanocycle
    • Safety Analysis and Design
    • Books
    • On the Web
    • Links
  • Services

  • Public Interest

  • Blog

  • What's New

  • Forum

  • About

  • Comments

  • Site Map

  • Geekosphere

  • Members

    • Members Only
  • More

    Use tab to navigate through the menu items.
    To see this working, head to your live site.
    • Categories
    • All Posts
    • My Posts

    The Engineering Forum

    Technical forums on topics of interest to systems engineers, embedded software developers, modelers, and others.

    UML / SysML

    Questions and discussions over UML/SysML modeling
    Views 
    Posts19

    Systems Engineering

    Systems engineering topics and discussions
    Views 
    Posts12

    Agile for Systems

    Process and methods, especially agile and lean for systems engineering and embedded real-time software development
    Views 
    Posts7

    Real-Time and Performance

    Discussion about technical aspects of timeliness, performance and scheduleability
    Views 
    Posts3

    Embedded SW Development

    Discussion of issues around the development of real-time embedded software, especially model-based development
    Views 
    Posts6

    Rhapsody

    Discussions specific to the IBM Rhapsody tool.
    Views 
    Posts14
    New Posts
    • Avraham Makeler
      Jul 27
      SysML design pattern for Publisher/Subscriber interfacing
      UML / SysML
      Hi Bruce, Is there a SysML design pattern for Publisher/Subscriber interfacing? If not, can you briefly give the top-level features in SysML? I guess that would be in terms of a BDD/ IBD diagrams. Great thanks in advance, Avi
      3 comments3
      0
    • Avraham Makeler
      Jul 10
      Continuation of: "How to show two activities in one activity diagram"
      UML / SysML
      Continuation of "How to show two activities in one activity diagram" My two threads do not overlap in time. But when you add swimlanes, a reader who knows what swimlanes are (usually) for, might think that I am trying to indicate that the threads execute in paraliel.
      2 comments2
      0
    • Avraham Makeler
      Jul 10
      How to showing two activities (threads) in one activity diagram?
      UML / SysML
      Hi Bruce How are you doing. I have a question on SysML Activity diagrams. For a System S, there is a Product P, which contains Process P1 and Process P2. Process X takes input and processes it and keeps the results internally. Later on in the System processing cycle, Process P2 reads P1's stored results and it (P2) outputs them. What is the SysML philosophy for presenting this? FYi, I have to try to keep my diagrams/model simple bc my corporation is still at the outset of using MBSE. Can I present the above in one activity diagram? I.e. , show two time event elements T1 and T2, where T2 fires and reads the stored results and then outputs them? And maybe each of P1 and P2 should be after its own 'Activity Start' , because really each of process P1 and process P2 are separate activities / threads. Further, in general, is what I have described - P1 and P2 - really two activities? Maybe they are really just two threads in one activity? Thanks Avi
      5 comments5
      0
    Site Map

    (c) Bruce Powel Douglass, Ph.D. 2019, 2020

    bruce.douglass@outlook.com