Database Systems Journal

ISSN 2069 - 3230

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


Database Systems Journal, Vol. IX, 2018



1. Designing a Currier Optimized Route Mobile Application (p. 3-12)
Luiza Cecilia MAZARE, The Bucharest University of Economic Studies, Romania
Simona-Vasilica OPREA, The Bucharest University of Economic Studies, Romania
Nowadays, most activities have had encountered changes due to the technology progress process. There is an obvious preference for the use of applications that help people with the everyday tasks, such as: getting a cab, booking a ticket at the cinema or even waiting for the online shopping to arrive. In this paper, we propose a mobile application for currier activities with optimization route that improves the performance.
Keywords: currier optimization route, mobile application design.
2. Informatics solution for Smart Garden based on Sensors (p. 13-21)
Diana-Alexandra RADU, The Bucharest University of Economic Studies, Romania
Simona-Vasilica OPREA, The Bucharest University of Economic Studies, Romania
This paper aims to develop an application dedicated to the growth and maintenance of plants, whether leguminous or decorative plants, which involves the traditional cultivation method that uses the soil. It consists in two main components: a mobile application that is be able to run on the Android operating system, and the physical component, which is referred to, in what follows, by the term "SmartGarden".
Keywords: sensors, Arduino, smart garden, monitoring.
3. Arbitrage Trading Systems - Design Principles and Server Architecture (p. 22-29)
Cristian PAUNA, The Bucharest University of Economic Studies, Romania
When dot.com has become a quaint idea, when electronic shops have lost the mass attention, when classical and margin trading has become obsolete, something new is coming: cryptocurrencies. Hundreds of virtual coins have been invented for a single reason: the profit. The high price volatility of these new markets and the fact that the virtual coins price is not regulated by a central bank or a single exchange, gives us opportunities for arbitrage trading. The existence of important price differences makes possible the profit when an automated system buy cheaper and sell more expensive in the same time. This paper will present the general principles underpinning the implementation of an arbitrage trading software for cryptocurrencies. The very large number of virtual coins and the tremendous higher number of cryptocurrency pairs, fundamentally change the server architecture of the trading software, including the database involved. The distributed price data in hundreds of sources and the technical differences of each of these data providers make all the things harder to be implemented in a single application. The low-latency order calculation needed for a fast delivery before a significant price change, in the presence of thousands of price quotes coming from hundreds of distributed servers makes everything special. To have a good reason for this extremely complex process, using theCryptoTrader software results, this paper will also reveal the level of the profits in this new field of the financial speculations.
Keywords: Cryptocurrency (CRYC), Arbitrage trading (ART), Algorithmic trading (AT), High Frequency Trading (HFT), Automated trading software (ATS).
4. Using SVM in Classification (p. 30-39)
Stefan PREDA, The Bucharest University of Economic Studies, Romania
Machine learning technology is very often used in present days. Exist many machine learning models, the theory has evolved in last year's due exponential use of those technologies. A challenge is to apply those advanced technologies in practice to solve different problems or to improve systems.
Keywords: Machine Learning (ML), Support Vector Machine (SVM).