Informatics 121 Software Design I Lecture 2 Andr

Informatics 121 Software Design I Lecture 2 André van der Hoek Duplication of course material for any commercial purpose without the explicit written permission of the professor is prohibited. 19 September 2021 – 02: 04: 45 (c) 2007 University of California, Irvine – André van der Hoek 1

Today’s Lecture n One design exercise n Reflection n Second assignment 19 September 2021 – 02: 04: 48 © 2007 University of California, Irvine – André van der Hoek 2

Five Teams n Team 1 – – – n n Jeremiah Jan Michael L. Thomas Arthur Team 2 – – – Cameron Sen Mathew (not here) Vinh Michael Y. Team 3 – – – n n Jonathan Jacob Rick David S. Nick Team 4 – – Nathan Subodh David P. Mohit Team 5 – – 19 September 2021 – 02: 04: 53 Aurora Danish Peter Linda © 2007 University of California, Irvine – André van der Hoek 3

Your Third Design Exercise n Build a structure that spans two bases… n …such that the distance between the two bases is maximized… n …out of Play-Doh, wire, paper, and dowels… n …using tools as necessary… n …in 1 hour n (we will take some pictures) 19 September 2021 – 02: 04: 55 © 2007 University of California, Irvine – André van der Hoek 4

Your Third Design Exercise – Available Materials n 10 dowels n 4 feet of wire n 10 sheets of paper n 3 large cans of Play-Doh “stuffed to the brim” 19 September 2021 – 02: 04: 58 © 2007 University of California, Irvine – André van der Hoek 5

Your Third Design Exercise – Constraints n The structure must be able to suspend, above the height of the base and for 15 seconds, one large can of Play-Doh – in the middle of the structure – in one other place on the structure of your choosing v v not overlapping with a base not overlapping with middle of the structure n The paper and dowels must remain in one piece n The structure as built should reflect the design as closely as possible 19 September 2021 – 02: 05: 02 © 2007 University of California, Irvine – André van der Hoek 6

Your Third Design Exercise – The Process n Design: 20 minutes n Present: 1 minute each (5 minutes total) n Build: 10 minutes n Re-design: 10 minutes n Build: 10 minutes n After the hour, the final structure has to stand n You are given access to sample materials n The structure with the largest span between the two bases “wins” 19 September 2021 – 02: 05: 04 © 2007 University of California, Irvine – André van der Hoek 7

Reflection n How does what you finally built differ from what you presented at first? 19 September 2021 – 02: 05: 07 © 2007 University of California, Irvine – André van der Hoek 8

Reflection n What did you learn during the first build phase that influenced your re-design? n What did your re-design phase focus on? 19 September 2021 – 02: 05: 09 © 2007 University of California, Irvine – André van der Hoek 9

Reflection n How closely did you follow your designs? 19 September 2021 – 02: 05: 11 © 2007 University of California, Irvine – André van der Hoek 10

Reflection n How much could you reuse from one version to the next? 19 September 2021 – 02: 05: 15 © 2007 University of California, Irvine – André van der Hoek 11

Reflection n What influence did the constraints have? – Limited dowels? – Supporting Play-Doh? – Two spots for the can? – Nature of the bases? – 20 total minutes to build 19 September 2021 – 02: 05: 22 © 2007 University of California, Irvine – André van der Hoek 12

Reflection n Would you have rather had one long, 40 minute, building phase? 19 September 2021 – 02: 05: 23 © 2007 University of California, Irvine – André van der Hoek 13

Reflection n How much could you draw upon your existing knowledge of bridges? 19 September 2021 – 02: 05: 23 © 2007 University of California, Irvine – André van der Hoek 14

Reflection n Which representation(s) did you use while designing? – Why did you create representations? 19 September 2021 – 02: 05: 24 © 2007 University of California, Irvine – André van der Hoek 15

Reflection n How did you know what would / would not work? 19 September 2021 – 02: 05: 27 © 2007 University of California, Irvine – André van der Hoek 16

Last year… n Similar? 19 September 2021 – 02: 05: 36 © 2007 University of California, Irvine – André van der Hoek 17

Second Assignment n Each team should create a design for a bridge using a single set of Geomag magnetic sticks and balls. n The bridge must span an 8 inch gap, across the bases from today’s exercise. n The bridge must be able to suspend a large can of Play-Doh at an arbitrary spot on the bridge. n The cost of the bridge should be minimized. Each stick and each ball cost one thousand dollars. 19 September 2021 – 02: 05: 43 © 2007 University of California, Irvine – André van der Hoek 18

Second Assignment n On Tuesday, bring a description of your design to class. n This description must be text only. This is important. The description must be text only. n Another team will build the bridge according to this design, and will have 20 minutes to do so. n The design team and build team will not be able to communicate or clarify anything with each other. n The designers and builders of the lowest cost bridge that spans 8 inches and supports the can of Play-Doh will win. 19 September 2021 – 02: 05: 43 © 2007 University of California, Irvine – André van der Hoek 19

Second Assignment – Caveat n There will be a change, announced in class before the building of the bridge commences. The change may involve a change in price, maximum components available, the length required, or something else entirely. n The build team will need to improvise to address the change. n If you want to win as a design team, you should make your design as robust and flexible as possible. n BRING YOUR SET TO CLASS! 19 September 2021 – 02: 05: 44 © 2007 University of California, Irvine – André van der Hoek 20