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41
mention the less-preferred alternative positively interlacing with the negative meaning,
or mention the most-preferred alternative negatively interlacing with the positive
meaning. This probabilistic relation considers that occasionally people do not mean
what they say [11], but people still tend to speak out what they really mean.
Probabilistic models describe how likely the team talks about the alternative they
prefer the most.
4.2 Notation
The following explains some symbols which are used in the later mathematic
formulations.
N: total number of alternatives in the studied design selection problem
T: total number of time intervals over the whole design process
i, j: the index to represent different time intervals in the design process
m, n, k: the index to represent different alternatives in the studied design selection
problem
r: the index to represent the different iterations of the calculation process
am : the mth alternative of of the studied design selection problem in the design
process
A: the set of all alternatives, i.e. A={a1,a2,...,aN }
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 53 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 41 mention the less-preferred alternative positively interlacing with the negative meaning, or mention the most-preferred alternative negatively interlacing with the positive meaning. This probabilistic relation considers that occasionally people do not mean what they say [11], but people still tend to speak out what they really mean. Probabilistic models describe how likely the team talks about the alternative they prefer the most. 4.2 Notation The following explains some symbols which are used in the later mathematic formulations. N: total number of alternatives in the studied design selection problem T: total number of time intervals over the whole design process i, j: the index to represent different time intervals in the design process m, n, k: the index to represent different alternatives in the studied design selection problem r: the index to represent the different iterations of the calculation process am : the mth alternative of of the studied design selection problem in the design process A: the set of all alternatives, i.e. A={a1,a2,...,aN } |
