Pile foundations have been the subject of interest for earthquake engineers since last several decades. The devastations caused in major earthquakes of the world can be the reason enough to carry out the research on the topic of seismic behavior of piles. One definite concern is liquefaction induced ground movement after the shaking in an earthquake, causing extra lateral loads acting on piles....

This paper presents a comparison of numerical methods for the modelling of pile driving noise in the near field of the pile. The numerical models considered consist of (1) an axisymmetric time domain finite difference method (FDM), developed by the Centre for Marine Science and Technology in the Matlab programming language, and (2) an axisymmetric time domain finite element method (FEM), which ...

We present here the proof for an alternative procedure to convert a Push Down Automata (PDA) into a Context Free Grammar (CFG). The procedure involves intermediate conversion to a single state PDA. In view of the authors, this conversion is conceptually simpler than the approach presented in [1] and can serve as a teaching aid for the relevant topics. For details on CFG and PDA, the reader is r...

What’s a question to your answer? We will not settle this puzzle here, yet we’ll taste it. But let’s begin at the beginning, namely in 1907, when Willem Abraham Wythoff [7], a Dutch mathematician, invented the game we analyze here, explained vividly by Martin Gardner in [5]. The game is played with two piles of tokens, each pile containing an arbitrary number of tokens. A move consists of eithe...

An open ended pipe pile can become plugged when sufficient frictional resistance is developed by the inner soil cylinder within the pile (soil plug), thereby preventing further intrusion of the soil into the pile. When plugging occurs in an impact driven pipe pile, a complex interaction between the pile and soil plug takes place, causing the propagating stress wave to undergo an abrupt change. ...

Multivision is played by two players who move alternately on a finite number of piles of finitely many tokens. A move consists of selecting a nonempty pile and changing the number of tokens in it. If the change is just any reduction in the number of tokens, we have the well-known game of Nim [1], [2]. In the present case, however, it is also permissible, normally, to increase the size of a pile...

Article history: Received 11 November 2015 Received in revised form 2 December 2015 Accepted 3 December 2015 Available online xxxx Development of more accurate descriptions of dislocation motion requires understanding the actual effective stress driving it. Back stresses from dislocation pile-ups can work against the applied stress resulting in lower stresses acting on moving dislocations. This...

We study the minimum concave cost flow problem over a two-dimensional grid network (CFG), where one dimension represents time (1 ≤ t ≤ T ) and the other dimension represents echelons (1 ≤ l ≤ L). The concave function over each arc is given by a value oracle. We give a polynomial-time algorithm for finding the optimal solution when the network has a fixed number of echelons and all sources lie a...

Unresolved indirect branch instructions are a major obstacle for statically reconstructing a control flow graph (CFG) from machine code. If static analysis cannot compute a precise set of possible targets for a branch, the necessary conservative over-approximation introduces a large amount of spurious edges, leading to even more imprecision and a degenerate CFG. In this paper, we propose to lev...

Experiments point at the need for a robust grammatical analysis on recognition results. A robust parsing can rst, help distinguish the incorrect recognitions that are recoverable; second, produce a relevant analysis for the interpretation process. We review existing robust parsing techniques and propose an approach based on Lexicalized Tree Grammars. We report experiments conducted on \Virtual ...