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12:00 22:45 32:30 41:22 50:20
Time (mm:ss)
Preferential Probability
gold
paper
Ti
Figure 5.6 Design Process Evolution: Group Preferential Probabilities of the Three
Alternatives for Filter Selection (Initial Probabilities with Equal Likelihood)
The first few preferential probabilities extracted from the transcript are highly
dependent on the designers’ preferences before starting the design process, while the
initial preferences are assumed equal, which brings errors for the first few preferential
probabilities. An improved PPT which employs the initial preferences before the
design process to predict the preferences during the design process will be elaborated
in Chapter 6.
5.4.3.1 Certainty of design choices
In a typical design selection process, it might be expected that a choice starts out
with relatively low certainty, and becomes more certain towards the end of a project.
Information entropy [109] is a measurement of the amount of uncertainty about an
event associated with a given probability distribution. The lower the value of
Object Description
| Title | Extraction of preferential probabilities from early stage engineering design team discussion |
| Author | Ji, Haifeng |
| Author email | haifengj@usc.edu; haifeng.ji@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Industrial & Systems Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-08-19 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-10-07 |
| Advisor (committee chair) | Yang, Maria C. |
| Advisor (committee member) |
Lu, Stephen Jin, Yan |
| Abstract | Activities in the early stage of engineering design typically include the generation of design choices and selection among these design choices. A key notion in design alternative selection is that of preference in which a designer or design team assigns priorities to a set of design choices. However, preferences become more challenging to assign on both a practical and theoretical level when done by a group of individuals. Preferences may also be explicitly obtained via surveys or questionnaires in which designers are asked to rank the choices, rate choice with values, or select a "most-preferred" choice. However, these methods are typically employed at a single point of time; therefore, it may not be practical to use surveys to elicit a team’s preference change and evolution throughout the process.; This research explores the text analysis on the design discussion transcripts and presents a probabilistic approach for implicitly extracting a projection of aggregated preference-related information from the transcripts. The approach in this research graphically represents how likely a choice is to be "most preferred" by a design team over time. For evaluation purpose, two approaches are established for approximating a team's "most preferred" choice in a probabilistic way from surveys of individual team members. A design selection experiment was conducted to determine possible correlations between the preferential probabilities estimated from the team's discussion and survey ratings explicitly stated by team members. Results suggest that there are strong correlations between extracted preferential probabilities and team intents that are stated explicitly, and that the proposed methods can provide a quantitative way to understand and represent qualitative design information using a low overhead information extraction method. |
| Keyword | preferences; probabilities; concept selection; design process; design decision-making |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1635 |
| Contributing entity | University of Southern California |
| Rights | Ji, Haifeng |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Ji-2413 |
| Archival file | uscthesesreloadpub_Volume14/etd-Ji-2413.pdf |
Description
| Title | Page 102 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 90 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 12:00 22:45 32:30 41:22 50:20 Time (mm:ss) Preferential Probability gold paper Ti Figure 5.6 Design Process Evolution: Group Preferential Probabilities of the Three Alternatives for Filter Selection (Initial Probabilities with Equal Likelihood) The first few preferential probabilities extracted from the transcript are highly dependent on the designers’ preferences before starting the design process, while the initial preferences are assumed equal, which brings errors for the first few preferential probabilities. An improved PPT which employs the initial preferences before the design process to predict the preferences during the design process will be elaborated in Chapter 6. 5.4.3.1 Certainty of design choices In a typical design selection process, it might be expected that a choice starts out with relatively low certainty, and becomes more certain towards the end of a project. Information entropy [109] is a measurement of the amount of uncertainty about an event associated with a given probability distribution. The lower the value of |
