C L Magee BiasesMore on CLM BiasesThe Materials Science MantraTHE METAPHOR EXPANDED ITHE METAPHOR EXPANDED IITHE METAPHOR EXPANDED IIILearnings from Materials Science ExperienceC L Magee Biases• Based upon Practice Experience– Legacy is more important than one usually realizes in the design of real systems– Standards and protocol design is the major way to influence the “design” of real world complex systems• Based upon Materials Science Education and Research Experience– Physics as “model” discipline• Observations of reality are the gold standard• Mathematical models are essential for real progress– Materials Science Mantra as a Metaphor for what we are trying to do in Systems ArchitectureMore on CLM Biases• Physicists (and copiers) Biases – The key to any Scientific Advance is to “explain the complex visible by some simple invisible” Jean Perrin– “Unless you can quantitatively measure it, you do not know what you are talking about” Lord Kelvin (Thompson)– Caveat ( age of earth estimated from Temperature of earth)• Came to Software/information technology later (1970’s but mostly 1990’s)• Came to biology later (systematics of interest earlier but mostly 2000’s)• Strong interest in Economics even in UG educationThe Materials Science Mantra“processing”>”structure”“structure”>”properties”A Metaphor for Architecture of Engineering Systems ?THE METAPHOR EXPANDED I• PROCESSING> STRUCTURE> PROPERTIES• Structure ~ Architecture• Where is Design?• Where is Behavior?• Structure determines/affects properties– Structure is a multi-dimensional term that includes many scales and concepts simultaneously (and thus is not a “simple invisible”)– Properties include attributes that encompass dynamics, behavior and “ilities”. – Relationships between Structure and Properties are plentiful and became strongest as material classes under detailed study increasedTHE METAPHOR EXPANDED II • Processing determines Structure– Different Processing Modes (casting, forging, crystal growth, e- beam deposition, etc.) have different control parameters ( Temperature gradient, stresses, pressure, magnetic and electrical fields, composition, etc.) that affect/determine properties.– Design is thus modifying the processing modes and control parameters in to obtain the desired combination of properties. Understanding structure is the chief enabler of effective design• Engineering Systems AnalogiesTHE METAPHOR EXPANDED III• Structure Characterization– Materials-Multiple Dimensional and very broadly construed: examples…..• Engineering Systems Possibilities for Architecture Characterization.. much of the focus of this course in my metaphorLearnings from Materials Science Experience • Utility as Scientific framework has been easier to establish than as practice enabler• Possible Lessons– Both Structure and Properties have to be viewed flexibly to make real progress– Quantitative Theories relating properties and structure are best evaluated while studying multiple systems– Details matter (observation and models)– “Concepts” emphasis and meaning changes (e.g.,
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