The aim of this study was to obtain a greater insight into the association between vacations and happiness. We examined whether vacationers differ in happiness, compared to those not going on holiday, and if a holiday trip boosts post-trip happiness. These questions were addressed in a pre-test/post-test design study among 1,530 Dutch individuals. 974 vacationers answered questions about their ...

Round-trip engineering is a challenging task that will become an important enabler for many Model-Driven Software Development approaches. Model round-trip engineering involves synchronizing models and keeping them consistent, thus enabling the software engineer to freely move between different representations. This vision of complete round-trip engineering is only realized to a limited degree i...

molecular dynamic simulation is a powerful method that monitors all variations in the atomic level in explicit solvent. by this method we can calculate many chemical and biochemical properties of large scale biological systems. in this work all-atom molecular dynamics simulation of polyalanine (pa) was investigated in the presence of 0.224, 0.448, 0.673, 0.897 and 1.122 m of guanidinium chlorid...

This paper explores interoperability for data represented using the Graph Annotation Framework (GrAF) (Ide and Suderman, 2007) and the data formats utilized by two general-purpose annotation systems: the General Architecture for Text Engineering (GATE) (Cunningham et al, 2002) and the Unstructured Information Management Architecture (UIMA) (Ferrucci and Lally, 2004). GrAF is intended to serve a...

We propose two methods to passively measure and monitor changes in round-trip times (RTTs) throughout the lifetime of a TCP connection. Our first method associates data segments with the acknowledgments (ACKs) that trigger them by leveraging the TCP timestamp option. Our second method infers TCP RTT by observing the repeating patterns of segment clusters where the pattern is caused by TCP selfc...

We develop an easy to use demand estimation strategy for multi-site trips within a stated preference framework. With this model, we evaluate: 1) changes in the marginal value of onsite time, 2) changes in the marginal value of total time in the tour package, 3) changes in both the number and types of sites on consumer surplus, 4) changes in the variable costs of onsite time on the elasticity of...