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Most existing bipedal dynamics models are built on an assumption of no foot slip. We relax such assumption and present hybrid zero dynamics model and properties for bipedal walking with foot slip. When foot slips, the biped hybrid zero dynamics (HZD) preserve rich features such as high dimensionality and transitions between slip and non-slip dynamics. We present the closed-form of the HZD for human...
Identifying the cleavage sites in proteins by HIV protease will greatly expedite the pace in searching for proper inhibitors of HIV protease. In this study, we focus on how many subsites are needed for predicting the cleavage sites. Using the rough set theory of information gain and reduct to search for the minimal and optimal subsites set, we found that, instead of the 8-subsite octapeptide model...
Land subsidence mainly caused by excessive extraction of groundwater is a growing and worldwide problem. Sustained decline in groundwater level has a direct impact on land surface elevation. However, the impact may not be consistent across subsidence areas. The spatially varying relationship between land subsidence and groundwater level variations remains unclear. This study explores the spatio-temporal...
We study the paper of Ardalan that published in IIE Transactions for inventory model dealing a temporarily price deduction during the sale period. Many papers had quoted this paper in their reference. Several papers extended Ardalan's model to more realistic systems. However, some questionable results in this paper had not been discussed and then revised. We will point out those questionable results...
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