Quadratic solitons for negative effective second-harmonic diffraction as nonlocal solitons with periodic nonlocal response function

We employ the formal analogy between quadratic and nonlocal solitons to investigate analytically the properties of solitons and soliton bound states in second-harmonic generation in the regime of negative diffraction or dispersion of the second harmonic

A Situated Model and Architecture for Distributed Activity-Based Computing

In this position paper, we introduce the situated activity model, an activity theory informed activity-based computing (ABC) model that unites the description of activity and situated contexts into one computational model. By introducing a unified activity model, we seek to connect cross domain activity systems ranging from desktop systems to pervasive computing and beyond. In this paper, we describe (i) the situated activity model (SAM), (ii) a conceptual description of a generic cloud-based architecture for the prototyping and development of situated activity systems (SAS) and (iii) the value of the situated activity approach in different application domains

NooSphere: An Activity-Centric Infrastructure for Distributed Interaction

Distributed interaction is a computing paradigm in which the interaction with a computer system is distributed over multiple devices, users and locations. Designing and developing distributed interaction systems is intrinsically difficult as it requires the engineering of a stable infrastructure to support the actual system and user interface. As an approach to this re-engineering problem, we introduce NooSphere, an activity-centric infrastructure and programming framework that provides a set of fundamental distributed services that enables quick development and deployment of distributed interactive systems. In this paper, we describe the requirements, design and implementation of NooSphere and validate the infrastructure by implementing three canonical real deployable applications constructed on top of the NooSphere infrastructure