Abstract
Managing programming exercises require several heterogeneous systems such as evaluation engines, learning objects repositories and exercise resolution environments. The coordination of networks of such disparate systems is rather complex. These tools would be too specific to incorporate in an e-Learning platform. Even if they could be provided as pluggable components, the burden of maintaining them would be prohibitive to institutions with few courses in those domains. This work presents a standard based approach for the coordination of a network of e-Learning systems participating on the automatic evaluation of programming exercises. The proposed approach uses a pivot component to orchestrate the interaction among all the systems using communication standards. This approach was validated through its effective use on classroom and we present some preliminary results.

Abstract
In this paper we propose a hybrid music recommender system, which combines usage and content data. We describe an online evaluation experiment performed in real time on a commercial music web site, specialised in content from the very long tail of music content. We compare it against two stand-alone recommenders, the first system based on usage and the second one based on content data. The results show that the proposed hybrid recommender shows advantages with respect to usage- and content-based systems, namely, higher user absolute acceptance rate, higher user activity rate and higher user loyalty. Copyright is held by the International World Wide Web Conference Committee (IW3C2).

Abstract

Abstract
We propose a methodology for flexible software design, runtime programming, by means of incremental software modifications at runtime. Runtime programming acknowledges that software designs are often incomplete, and require the flexibility of change, e.g., fixing bugs or introducing new features, without disruption of their service. This flexibility is much needed for critical software that generally needs to handle uncertainty, e.g. cloud computing or cyber-physical systems, due to dynamic requirements of composition, service, or performance. Runtime modifications should be allowed recurrently, and, thus, be handled as a common case of system functionality in predictable and efficient manner, with proper understanding of inherent functional and non-functional aspects. The work in many diverse research communities with related concerns typically tends to take a partial and domain-specific view of the problem, hence comprehensive and general methodologies are in order. In this extended abstract, we make a summary of the runtime programming proposal of [4]. The work follows up on a preliminary formulation of runtime programming [3], and work on modular compilation of real-time programs [2]. © 2012 Springer-Verlag.

Abstract
We introduce a simple agent construct associated to a named local database and a "Twitter-style"weak inheritance mechanism between local agents. On top of a remote predicate call layer, connecting distributed agent spaces, we build a replication mechanism allowing agents "visiting" remote spaces to expose their computational capabilities to non-local followers. The resulting protocol has the remarkable property that only updates to the state of the agents are sent over the network through transactional remote predicate calls guaranteed to always terminate, and therefore spawning of multiple threads can be avoided. At the same time, calls to a visiting agent's code by its followers are always locally executed, resulting in performance gains and reduced communication efforts. Copyright 2012 ACM.

Abstract
Logic programming is well suited for declaratively solving computational problems that require knowledge representation and reasoning. Object-oriented languages, on the other hand, are well suited for modeling real-world concepts and profit from rich ecosystems developed around them, which are often missing from logic languages. For applications that require both the declarative power of logic programming and the rich modeling expressiveness and development environments offered by object-oriented languages, there is a need for reconciling both worlds. LogicObjects is our linguistic symbiosis framework for integrating Prolog within the Java language. It extends Java with annotations that allow Java programs to interact transparently and automatically with Prolog programs. Copyright 2012 ACM.