Abstract-Band - Fakultät für Informatik, TU Wien - Technische ...

from ORACLE: the Sun SPOT. This device offers a variety of mechanisms which
can be used for the location determination as, for example, the accelerometer
as well as offering the ability for wireless communication. First, we will show
that our experiments with the accelerometer device yields imprecise localization
results related to erroneous measurement-readings from the devices
accelerometer-chip itself, thus not usable in indoor environments. The second
part of this thesis covers the location inference based on the wireless network
communication of the Sun SPOT, which in turn is based on key performance
indicators and the Weighted Centroid Localization (WCL) algorithm. We will
show that this inexpensive and effective approach is suitable for roughly
determining location, because of its imprecise measurement values and
dealings with common issues in a wireless network, like interferences and
reflections.
Rene Nowak
Towards Providing Unified Access To Cloud Data Storage Services
Studium: Masterstudium Software Engineering & Internet Computing
BetreuerIn: Univ.Prof. Dr. Schahram Dustdar
With an increasing number of devices using applications, the amount of data
that has to be managed has grown rapidly. This means, that scalability of databases
gets more and more important. So in the last years so called not only
SQL (NoSQL) databases have become popular because they can be distributed
more easy than traditional relational databases. The problem is, that different
data stores use different ways to manage their data and provide specific
interfaces to persist and load this data sets. This makes it hard for application
developers to use this new technologies in their applications. So using
different types of persistence, as described in the polyglot persistence model,
means that a lot of code has to be written for covering the different APIs. The
following thesis describes and presents a solution to access different types of
data storage through one interface. Therefore, the differences between the
management and storage of data are described and discussed. Based on this
discussion, a common interface will be designed. Because the API cannot cover
all different functionalities, developers will also get the possibility to access
specific libraries, to use special functions for a data store. This means, that data
can be stored where it fits best, without losing any functionality or flexibility. In
some cases, it is useful to move data from one data store to another. This
often requires a lot of migration code to read and write data. In this thesis, we
will also present a solution for this problem and a prototype implementation of
this feature will be discussed.
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