Database Systems Journal

ISSN 2069 - 3230

Published with the support of:
The Bucharest University of Economic Studies

Database Systems Journal, Vol. VII, Issue 3/2016
Issue Topic: Database applications

Open PDF Journal


1. Solutions for Optimizing the Relational JOIN Operator using the Compute Unified Device Architecture (p. 3-13)
Alexandru PIRJAN, The Romanian-American University, Bucharest, Romania
In this paper it is implemented the inner JOIN operator in the latest Pascal Compute Unified Device Architecture (CUDA), using two approaches developed in the CUDA Toolkit 8.0: a classical approach in which a thread selects one element from the first table and performs a binary search for the corresponding keys residing in the second table; a second approach that makes use of the dynamic parallelism feature of the Pascal architecture to solve the problem of task processing unbalance that may occur when the number of corresponding elements is different along the threads. The Compute Unified Device Architecture dynamic parallelism feature is used to invoke a supplementary kernel function in order to build in parallel the final output set of elements.
Keywords: CUDA, Pascal architecture, Dynamic Parallelism, GPU, inner JOIN operator.
2. Informatics Solutions Requirements for Electricity Consumption Management (p. 14-21)
Simona OPREA, The Bucharest University of Economic Studies, Bucharest, Romania
Adela BÂRA, The Bucharest University of Economic Studies, Bucharest, Romania
Anda BELCIU, The Bucharest University of Economic Studies, Bucharest, Romania
Our work is supported through a grant research project within PNCDI III competition that aims to transfer the knowledge and expertise from universities to business environment in order to improve the performance of modern technologies. The scope of our project PN-III-P2-2.1-BG-2016-0286 is to develop informatics solutions for electricity consumption analysis and optimization in smart grids. The new technology that belongs to our partner Repower Furnizare Romania SRL - electricity supplier consist in pilot smart metering system recently implemented at consumer site. In this paper we describe the smart metering system technology, informatics solution requirements, our research objectives, main software technologies and prototype architecture.
Keywords: Internet of Things, smart metering system, business intelligent, electricity prosumers, consumption data.
3. Normal Distribution Based Similarity Profiled Temporal Association Pattern Mining (N-SPAMINE) (p. 22-33)
Vangipuram RADHAKRISHNA, VNR Vignana Jyothi Institute of Engineering and Technology, India
P.V.KUMAR, University College of Engineering, Osmania University, India
V.JANAKI, Vaagdevi Engineering College, India
Temporal patterns in time stamped temporal databases are sequences of support values and hence, they are represented as vectors. This makes it challenging to obtain similar association patterns in context of time stamped temporal databases whose support trends change similar to a reference support sequence trend. The main idea of this work is to study the possibility of applying normal distribution concept to find similarly varying temporal patterns. This paper introduces a new approach, called N-SPAMINE for mining similarity profiled temporal association patterns by applying normal distribution which is first of its kind of approach for finding similar association patterns and uses the novel dissimilarity measure for obtaining dissimilarity between chosen temporal pattern and the reference. The results show that the proposed approach is correct and complete.
Keywords: Temporal, Normal distribution, Z-score, Support Sequence, Outlier.
4. An analysis of the main Characteristics and Implementation Requirements of the Advanced Metering Infrastructure Systems in Romania (p. 34-45)
George CARUTASU, The Romanian-American University, Bucharest, Romania
Cristina COCULESCU, The Romanian-American University, Bucharest, Romania
Justina Lavinia STANICA, The Romanian-American University, Bucharest, Romania
Alexandru PIRJAN, The Romanian-American University, Bucharest, Romania
In this paper, we analyze the main characteristics and implementation requirements of the advanced metering infrastructure (AMI) systems in Romania, taking into account that the smart metering implementation enables the consumer to devise a custom-tailored strategy for his own energy consumption. First, we have studied a series of important aspects regarding the intelligent metering systems, then we highlight legal aspects regarding the implementation of AMI systems in Europe and in Romania. Afterwards, we have analyzed the types of energy consumers, their demands regarding the technological solutions for the assessment of their own consumption, registered by the smart meters and finally aspects regarding the emerging trends of the consumers' behavior. By implementing advanced metering infrastructure systems, through judicious investments and activities related to the consumers' behavior, one can obtain an improved energy efficiency at both national and international levels.
Keywords: AMI, ANRE, Smart Metering, Data Transmission Network, Data Management.