Women engineers from the United States

309 quotes found

"A conceptual level view of an object design describes the key abstractions. While someone might think of key abstractions as being nothing more or nothing less than high-level descriptions of "candidate classes", I prefer to consider a conceptual design from a slightly different angle--I'm thinking about design at a slightly different level. An object-oriented application is a set of interacting objects. Each object is an implementation of one or more roles. A role supports a set of related (cohesive) responsibilities. A responsibility is an obligation to perform a task or know certain information. And objects don't work in isolation, they collaborate with others in a community to perform the overall responsibilities of the application. So a conceptual view, at least to start, is a distillation of the key object roles and their responsibilities (stated at a fairly high level). More than likely (unless you form classification hierarchies and use inheritance and composition techniques) many candidates you initially model will map directly to a single class in some inheritance hierarchy. But I like to open up possibilities by think first of roles and responsibilities, and then as a second step towards a specification-level view, mapping these candidates to classes and interfaces."

- Rebecca Wirfs-Brock

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"Well, that’s a different story. When I moved to Penn there was nothing, and so I had to build everything from scratch. My first master student, Adam Snyder, was an electrical engineer, and he and I built the digitizer, because we had to buy these analog cameras – camera, one camera – and then build a digitizer. And then I got some NSF initial grants that allowed me to buy a raster display so that we can visualize. The department had PDP-11, so I was working on that computer, and, as I said, it had just a very small memory, and so we were swapping things back and forth. I started to work on – I basically wanted to continue my Ph.D. work, and one of the first things that I started to look at was texture gradient and how can you interpret the three-dimensional information from the two-dimensional projection of the texture gradient. So that was the first Ph.D. with Larry Lieberman, right, was my first Ph.D. student, who then went to IBM research and worked on – had a group in robotics, because I was always interested in the three-dimensional interpretation of the visual information from the very beginning, and I always was interested in vision for, not just vision per se but what is vision for. I thought that it was a good way of testing your algorithms, if you can find the interpretation where you are or can you grasp things or move around? I mean, the robotics gives you a very good testing of your sensory processing, so that’s what I focused on. And then I think it was maybe ’73 or ’74 a man by name Britton Chance, who just passed away yesterday, 97 years old, who was a very prominent biophysicist, he invited me to look at some of these X-ray images from rat brains, because they were really interested in automating the image processing of these medical images. So he brought me into this group, and I found it very interesting, and so that started my career in medical image processing. I worked with him or for him for about six months, but then he was a very strong personality and my joke was you worked for him or you didn’t, and so I quit because I didn’t want to work for him. But then I continued with other people in the medical school at Penn on medical image processing, and I did some nice work there."

- Ruzena Bajcsy

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