Stealth databases : ensuring user-controlled queries in untrusted cloud environments

Sensitive data is increasingly being hosted online in ubiquitous cloud storage services. Recent advances in multi-cloud service integration through provider multiplexing and data dispersion have alleviated most of the associated risks for hosting files which are retrieved by users for further processing. However, for structured data managed in databases, many issues remain, including the need to perform operations directly on the remote data to avoid costly transfers. In this paper, we motivate the need for distributed stealth databases which combine properties from structure-preserving dispersed file storage for capacity-saving increased availability with emerging work on structure-preserving encryption for on-demand increased confidentiality with controllable performance degradation. We contribute an analysis of operators executing in map-reduce or map-carry-reduce phases and derive performance statistics. Our prototype, StealthDB, demonstrates that for typical amounts of personal structured data, stealth databases are a convincing concept for taming untrusted and unsafe cloud environments

Energy-Efficient Databases Using Sweet Spot Frequencies

Database management systems (DBMS) are typically tuned for high performance and scalability. Nevertheless, carbon footprint and energy efficiency are also becoming increasing concerns. Unfortunately, existing studies mainly present theoretical contributions but fall short on proposing practical techniques. These could be used by administrators or query optimizers to increase the energy efficiency of the DBMS. Thus, this paper explores the effect of so-called sweet spots, which are energy-efficient CPU frequencies, on the energy required to execute queries. From our findings, we derive the Sweet Spot Technique, which relies on identifying energy-efficient sweet spots and the optimal number of threads that minimizes energy consumption for a query or an entire database workload. The technique is simple and has a practical implementation leading to energy savings of up to 50% compared to using the nominal frequency and maximum number of threads

Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise. © 2015

Analysis on Inference Mechanisms for Schema-driven Forms Generation

Abstract: Auto-generated graphical user interfaces can save time and avoid mistakes in application development. Data description schemas can form the base for these generation mechanisms. The use of XML-based languages for the schema and for the resulting user interfaces presents a couple of challenges with contemporary representatives of both. We selected XML Schema and XForms as those representatives. Our goal was to explore as many mechanisms as possible which will lead to a complete generated form which can produce or consume data according to the schema. The mechanisms were implemented and are explained in this contribution.

WSInterConnect: Dynamic Composition of Web Services Through Web Services

Abstract. In this paper, a model is presented which allows the compo-sition of web services by means of a special web service, named WSInter-Connect. Such a service might be used in a portal environment to allow interactive services lookup and creation of permanent composed services in the design stage, and for efficiently resolving missing parameters dur-ing the runtime of a process. The portal integration relies on augmented service description files based on WSGUI concepts [1], and provides a usable infrastructure for BPEL4People [4] concepts.

WSGUI, or Web Services Graphical User Interface,

Abstract: Dynamic web service invocation without special client software may help the adoption of service-oriented architectures on the consumer stage. Ad-hoc usage of services requires a powerful set of concepts to visualise the service input and output messages in a user-friendly, ergonomic and extensible way. Such concepts are collected in a research effort named Web Service Graphical User Interface and are presented in the paper in combination with an algorithm to combine the concepts into one imaginary GUI creation engine, for which a proof-of-concept implementation exists. Extensibility is achieved by using implicit and explicit GUI generation hints in addition to inference mechanisms based on the message structures

Xth International Conference on Modern Problems of Radio Engineering, Telecommunications and Computer Science (TCSET)

According to the latest research results, service trading and execution platforms promote automated discovery, composition, contracting and adaptive execution of web services. This vision has not yet arrived in the business sector which is still dominated by manual services listed in person or company profiles in traditional business service directories and social networks. A combination of features from both sides yields powerful, user-centric service trading platforms