Sign reversal of the mixed-state Hall resistivity in type-II superconductors

Taking into account pinning, thermal fluctuations, and vortex-vortex interactions, we develop a unified theory to explain the sign reversal of the mixed-state Hall resistivity ρ xy in both high-T c and low-T c superconductors. Molecular dynamics simulations show that besides the pinning forces, either the thermal fluctuations in the high-T c superconductors or the vortex-vortex interactions in the low-T c ones play an important role in the sign reversal of ρ xy. From a calculated phase diagram for vortex motion, we find that the abnormal Hall effect always occurs in the plastic flow state of vortices. ©1999 The American Physical Society.published_or_final_versio

Soliton interaction in a fiber ring laser

Author name used in this publication: H. Y. Tam2005-2006 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Compound pulse solitons in a fiber ring laser

Author name used in this publication: H. Y. Tam2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Bound-soliton fiber laser

Author name used in this publication: H. Y. Tam2002-2003 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Pulse-train nonuniformity in a fiber soliton ring laser mode-locked by using the nonlinear polarization rotation technique

Author name used in this publication: P. ShumAuthor name used in this publication: H. Y. Tam2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Cognitively-inspired Agent-based Service Composition for Mobile & Pervasive Computing

Automatic service composition in mobile and pervasive computing faces many challenges due to the complex and highly dynamic nature of the environment. Common approaches consider service composition as a decision problem whose solution is usually addressed from optimization perspectives which are not feasible in practice due to the intractability of the problem, limited computational resources of smart devices, service host's mobility, and time constraints to tailor composition plans. Thus, our main contribution is the development of a cognitively-inspired agent-based service composition model focused on bounded rationality rather than optimality, which allows the system to compensate for limited resources by selectively filtering out continuous streams of data. Our approach exhibits features such as distributedness, modularity, emergent global functionality, and robustness, which endow it with capabilities to perform decentralized service composition by orchestrating manifold service providers and conflicting goals from multiple users. The evaluation of our approach shows promising results when compared against state-of-the-art service composition models.Comment: This paper will appear on AIMS'19 (International Conference on Artificial Intelligence and Mobile Services) on June 2

Gain-guided solitons in dispersion-managed fiber lasers with large net cavity dispersion

Author name used in this publication: C. Lu2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Induced solitons formed by cross-polarization coupling in a birefringent cavity fiber laser

Author name used in this publication: H. Y. TamVersion of RecordPublishe