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A Hybrid Bishop-Hill Model For Microstructure Sensitive Design, Ribeka Takahashi
A Hybrid Bishop-Hill Model For Microstructure Sensitive Design, Ribeka Takahashi
Theses and Dissertations
A method is presented for adapting the classical Bishop-Hill model to the requirements of elastic/yield-limited design in metals of arbitrary crystallographic texture. The proposed Hybrid Bishop-Hill (HBH) model, which will be applied to ductile FCC metals, retains the `stress corners' of the polyhedral Bishop-Hill yield surface. However, it replaces the `maximum work criterion' with a criterion that minimizes the Euclidean distance between the applicable local corner stress state and the macroscopic stress state. This compromise leads to a model that is much more accessible to yield-limited design problems. Demonstration of performance for the HBH model is presented for an extensive …
Determination Of Effective Training Methods To Learn A Laparoscopic Camera Navigation Task Under Stressful Environments, Devnath Vasudevan
Determination Of Effective Training Methods To Learn A Laparoscopic Camera Navigation Task Under Stressful Environments, Devnath Vasudevan
Theses and Dissertations
Stress in surgical environment is generally very high and can result in performance degradation increasing patient risk .Current Training systems for learning minimally invasive surgical skills do not consider the component of stress in their training model. In this study the focus was on developing alternative training models that would allow the learner to effectively perform minimally invasive skill under stress. Two alternate training methods: 1) Training under stress until high performance levels and 2) training until high performance and low cognitive load are achieved were considered for this study. The control group consisted of training under no stress and …