{ baumann I dehmel I furtado I ritsch I widmann }@forwiss.tu-muenchen.de 1. ABSTRACT RasDaMan is a universal -i.e., domain-independent -array DBMS for multidimensional arrays of arbitrary size and structure. A declarative, SQL-based array query language offers flexible retrieval and manipulation. Efficient serverbased query evaluation is enabled by an intelligent optimizer and a streamlined storage architecture based on flexible array tiling and compression.RasDaMan is being used in several international projects for the management of geo and healthcare data of various dimensionality.
Parallelism can be used for major performance improvement in large Data warehouses (DW) with performance and scalability challenges. A simple low-cost shared-nothing architecture with horizontally fully-partitioned facts can be used to speedup response time of the data warehouse significantly. However, extra overheads related to processing large replicated relations and repartitioning requirements between nodes can significantly degrade speedup performance for many query patterns if special care is not taken during placement to minimize such overheads. In this paper we show these problems experimentally with the help of the performance evaluation benchmark TPC-H and identify simple modifications that can minimize such undesirable extra overheads. We analyze experimentally a simple and easy-to-apply partitioning and placement decision that achieves good performance improvement results.
We are living in a new communication age, which will radically transform the way we live in our society. A world where anything will be connected to Internet is being created, generating an entirely new dynamic network -The Internet of Things (IoT) -enabling new means of communication between people, things and environment.A suitable architecture for Internet of Things (IoT) demands the implementation of several and distinct technologies that range from computing (e.g. Cloud Computing), communications (e.g. 6LowPAN, 3/4G) to semantic (e.g. data mining). Thus, it is necessary to understand very well all these technologies in order to know which of them is most suitable for a given scenario. Therefore, this paper proposes an IoT architecture for disabled people and intends to identify and describe the most relevant IoT technologies and international standards for the stack of the proposed architecture. In particular, the paper discusses the enabling IoT technologies and its feasibility for people with disabilities. At the end, it presents two use cases that are currently being deployed for this population.
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