A (t,u)threshold public key encryption (TPKE) is a public key encryption where a private key is splitted among u decryption servers (insiders) and at least t decryption servers (insiders) are required to decrypt the ciphertext but no group of t− 1 or less malicious insiders can decrypt the message. Bendlin and Damgard [1] presented first lattice based threshold public key encryption scheme base...

Planning trajectories for nonholonomic systems is difficult and computationally expensive. When facing unexpected events, it may therefore be preferable to deform in some way the initially planned trajectory rather than to re-plan entirely a new one. We suggest here a method based on affine transformations to make such deformations. This method is exact and fast: the deformations and the result...

This paper proposes a mathematical approach that can increase energy saving in timetables. The energy-efficient timetabling method, we use, maintains the planned traveling time between stations, but coordinates the train departure times at the starting station from current timetable.We formulate this problem as a multi-criteria mixed integer programming to minimize the peak energy and simultane...

While a plethora of techniques are available for ventral hernia repair (VHR), these may fall short in the face of chronic near-total loss of abdominal domain. The Wittmann patch (Star Surgical, Burlington, WI) has been described in the literature as an acute method of maintaining abdominal wall integrity with planned re-laparotomy. However, we demonstrate that it is also an effective adjunct to...

While a plethora of techniques are available for ventral hernia repair (VHR), these may fall short in the face of chronic near-total loss of abdominal domain. The Wittmann patch (Star Surgical, Burlington, WI) has been described in the literature as an acute method of maintaining abdominal wall integrity with planned re-laparotomy. However, we demonstrate that it is also an effective adjunct to...

In this paper, we analyze software that we inherited from another party. We analyze its architecture and use common design principles to identify critical changes in order to improve its flexibility with respect to a set of planned extensions. We describe flexibility issues that we encountered and how they were addressed by a redesign and re-implementation. The study shows that basic and well-e...