Mary Frecker

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A procedure to obtain a topology of an optimal structure considering flexibility is presented. The methodology is based on a mutual energy concept for formulation of flexibility and the homogenization method. A multi-objective optimization problem is formulated as an application of compliant mechanism design. Some examples of the design of compliant(More)
Background: In the area of instrument evaluation, one aspect that still requires objective assessment is the dynamics of instrument maneuver and exchange. If we could gain a better understanding of these phenomena, we could improve the design of the instruments themselves. Methods: A total of 29 laparoscopic procedures were videotaped and reviewed using(More)
BACKGROUND Advances in minimally invasive surgical techniques will require new types of instrument end-effectors for smaller, longer, and flexible instruments. These include a new class of multifunctional instruments capable of performing more than 1 task with a single set of working jaws. Furthermore, it is desired that multifunctional instruments be(More)
Compliant mechanisms that can perform multiple unique functions have great potential for use in minimally invasive therapy. A fully compliant mechanism may be thought of as a monolithic mechanism without hinge joints which uses elastic deformation to achieve force and motion transmission. Incorporating multifunctional compliant mechanisms into minimally(More)
Recently, smoothly-deforming aircraft structures have been investigated for their ability to adapt to varying flight conditions. Researchers aim to achieve large changes in the shape of the wings: area changes of up to 50% and aspect-ratio changes of up to 200% are being pursued. The research described in this paper aims to develop a structural concept(More)
In this paper we describe four design optimization problems and corresponding design interfaces that have been developed to help assess the impact of fast, graphical interfaces for design space visualization and optimization. The design problems involve the design of an I-beam, desk lamp, aircraft wing, and job shop manufacturing system. The problems vary(More)
Despite the apparent advantages of and recent advances in the use of visualization in engineering design and optimization, we have found little evidence in the engineering literature that assesses the impact of fast, graphical design interfaces on the efficiency and effectiveness of engineering design decisions or the design optimization process. In this(More)
The authors determine the utility of applying two display design principles toward the development of interfaces for engineering design. The first principle, called the Proximity Compatibility Principle, specifies that displays relevant to a common task or mental operation should be rendered close together in perceptual space. The second principle, called(More)