Sefrea - Software e Sistemas

22/12/2017

Votos de um Feliz Natal para todos! May your heart and home be filled with all of the joys the festive season brings. Merry Christmas and a wonderful 2018!

21/07/2013

SEFREA has re-crafted its website using the latest HTML5/CSS3 responsive techniques for an optimal viewing experience in all devices (desktop computers, tablets and mobile phones). The website was rebuilt from scratch and now supports a fluid layout, media queries, flexible images, as well as beautiful native CSS3 transitions. Feel free to check it out using your iPhone/iPad or Android device: http://www.sefrea.com/

15/05/2013

Management System for Condominium Services (http://www.sefrea.com/en/portfolio/management-system-for-condominium-services/)

Proof-of-concept management system for condominium services. Technical implementation details: Oracle DBMS accessed by PL/SQL; Web interface based on HTML, XML, XSL; 3NF and BCNF normalization; TRIGGERS;

15/05/2013

4-finger CDMA RAKE Receiver (http://www.sefrea.com/en/portfolio/4-finger-cdma-rake-receiver/)

MATLAB/SIMULINK 4-finger RAKE receiver design; this type of receiver is commonly used in CDMA systems and allows for transmitted signal replica combination, yielding an improved signal estimate at the receiver output.

15/05/2013

Free-space optics (FSO) Transmission System (http://www.sefrea.com/en/portfolio/free-space-optics-fso-transmission-system/)

Technical and economical feasibility study for the design of a low-cost, short-haul, FSO communication system; expected transmission rates around 1.25 Gbps (1000BASE-SX Gigabit Ethernet interface)

15/05/2013

The project goal was to design, implement and test a 1.7 GHz low-noise amplifier (LNA) intended to be the first stage of a Meteosat System downconverter; The LNA, together with the following stages (such as the baseband filter, the mixer and the local oscillator), would allow the reception of meteorological images from the Meteosat System; Once implemented on a PCB using microstrip technology, the individual components and the overall LNA system were tested using microwave measurement techniques; more specifically, S-parameter measurements were made using a vector network analyser; The design process was assisted by the use of EM simulation software, such as Ansoft Serenade.

http://www.sefrea.com/en/portfolio/meteorological-satellite-earth-station/

15/05/2013

MIMO for 4G Wireless Communications (http://www.sefrea.com/en/portfolio/mimo-for-4g-wireless-communications/)

Derivation of the maximum spectral efficiency of multiple-input multiple-output (MIMO) systems in mobile wireless communication environments; Study, design and validation of advanced transmission and reception techniques in doubly dispersive MIMO LTV systems

15/05/2013

Design, implementation (in Java / C) and testbed validation of a passive monitoring system for distributed access networks; key results/achievements: real-time identification and tracking of Mobile IPv6 traffic flows; collection of monitoring data based on Cisco IOS NetFlow v9 interface; two-way communication for behavioral control of filtering/sampling of traffic; implementation of a front-end (JFC/Swing) for real-time interactive network monitoring; real-time plotting of the network topology, node mobility detection, display of flow path information and traffic statistics; plotting of high-precision start/finish curves, including high performance 'zooming' techniques for the computation of instantaneous data rates, delays between nodes, retransmissions and packet loss; mobility analysis with real-time metrics.

http://www.sefrea.com/en/portfolio/mobile-ipv6-state-of-the-art-monitoring-system/

15/05/2013

client: Daphne Pty. Ltd., Australia (link: http://www.sefrea.com/en/portfolio/customer-relationship-management-crm-system/)

Design, implementation and testing of a Web-based Customer Relationship Management (CRM) System; works: Database Design; Microsoft SQL Server setup; 3-tier Management System Development; Web Design/Integration; MYOB Import/Export synchronization; Business Intelligence Reporting; Deployment to SBS 2003/2011 (IIS6/7);

15/05/2013

client: Streetdata Pty Ltd., Australia (http://www.sefrea.com/en/portfolio/outlook-mobile-service-oms-system/)

Design, implementation and testing of the Outlook® Mobile Service (OMS) System, namely: OMS SOAP Server (full PHP language implementation), Interface to Streetdata’s HTTPS API, Database for data storage, Web interface for message-level troubleshooting. The system uses sophisticated technologies such as: Web Services, PHP /HTML, MySQL Database, SOAP Client /Server, XML /WSDL, HTTP /HTTPS,Apache HTTP Server, Trusted SSL/TLS (RSA) Certificates/Keys, OMS Technology /Specification

15/05/2013

SEFREA's portfolio:

English: http://www.sefrea.com/en/portfolio/
Portuguese: http://www.sefrea.com/pt/portfolio/

SEFREA has a track record of conceiving complex solutions, such as Web Portals, CRM Systems, Industrial Monitoring Applications, Gigabit Data Networks and Control Systems.

15/05/2013

Consulting | Network Design, Implementation and Management (http://www.sefrea.com/en/services/network-design-implementation-and-management/):

Hardware- and service-level management;
Routing, Switching, Security and Firewalling components;
Windows or Linux environments;
Nagios and Prelude-IDS management platforms.

Hardware- and service-level management, Routing, Switching, Security and Firewalling components, Windows or Linux environments, Nagios and Prelude-IDS management platforms