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1
Ulibarri, Desirea Duarte. « Volunteer system project Regis University Networking Lab Practicum / ». [Denver, Colo.] : Regis University, 2006. http://165.236.235.140/lib/DUlibarriPartI2006.pdf.
Texte intégral
2
Sundaram, Prashanthi. « Student database access from the web ». CSUSB ScholarWorks, 1998. https://scholarworks.lib.csusb.edu/etd-project/1785.
Texte intégralRésumé :
This project, Database Access through the Web (DAW), implements a database to store academic and general information of graduate students in the Department of Computer Science, CSUSB and provides access to the database from the web. The motivation of the project comes from needs of the Graduate Coordinator, professors and department staff to access through the Internet student information concurrently.
3
Kubler, Sylvain. « Premiers travaux relatifs au concept de matière communicante : Processus de dissémination des informations relatives au produit ». Phd thesis, Université Henri Poincaré - Nancy I, 2012. http://tel.archives-ouvertes.fr/tel-00759600.
Texte intégralRésumé :
Depuis de nombreuses années, plusieurs communautés telles que IMS (Intelligent Manufacturing Systems), HMS (Holonic Manufacturing System) ont suggéré l'utilisation de produits intelligents pour rendre les systèmes adaptables et adaptatifs et ont montré les bénéfices pouvant être réalisés, tant au niveau économique, qu'au niveau de la traçabilité des produits, qu'au niveau du partage des informations ou encore de l'optimisation des procédés de fabrication. Cependant, un grand nombre de questions restent ouvertes comme la collecte des informations liées au produit, leur stockage à travers la chaîne logistique, ou encore la dissémination et la gestion de ces informations tout au long de leur cycle de vie. La contribution de cette thèse est la définition d'un cadre de dissémination des informations relatives au produit durant l'ensemble de son cycle de vie. Ce cadre de dissémination est associé à un nouveau paradigme qui change radicalement la manière de voir le produit et la matière. Ce nouveau concept consiste à donner la faculté au produit d'être intrinsèquement et intégralement communicant. Le cadre de dissémination des informations offre la possibilité à l'utilisateur d'embarquer des informations sensibles au contexte d'utilisation du produit communicant. Outre la définition du processus de dissémination des informations, cette thèse offre un aperçu des champs de recherche, tant scientifiques que technologiques, à investiguer par l'avenir concernant le concept de matière communicante.
4
González, Carreño Gastón Patricio. « Análisis y evaluación de las bases de datos incorporadas en la biblioteca virtual de la Universidad Miguel de Cervantes ». Thesis, 2014. http://eprints.rclis.org/23667/1/INDICE.pdf.
Texte intégralRésumé :
The research focused on analyzing and evaluating the databases included in the web page of the University Miguel de Cervantes. In particular twenty database were evaluated, including the Proquest databases, and SIARE DIALNET in open access version included. This model was applied to evaluate databases proposed by Alejo Febles, T., Serrano Manzano, P. Bermejo and Fresco, L. Subsequently, we proceeded to analyze thirteen database Proquest: ABI / INFORM Complete, Accounting Tax , PRISMA, Banking Information Service, Proquest
Asian Business and Reference, Proquest Criminal Justice, Educational Journals Proquest,
ProQuest Newsstand, ProQuest Career and Technical Education, Proquest Health
Military Collection Management and Proquest.
The analysis looked at six indicators of content: Thematic scope, idiomatic scope, temporal scope, authority of the producer / editor, material type and geographic reach. The analysis results are presented separately for each database form.
5
Castelli, Marta C. « Requisitos Profesionales del Bibliotecario en Área de Salud : Análisis en Mar del Plata ». Thesis, 2007. http://eprints.rclis.org/20645/3/Tesina_Castelli.pdf.
Texte intégralRésumé :
The scientific documentation looms, together with access to information and management of their tools is fundamental in the training and development of professionals that enable scientific and technological progress. Particularly in the health sciences and medicine precisely this development is one of the most remarkable, considering the medical documentation the most complex of all. The highly computerized technological equipment and diagnostic techniques applied in the development of this discipline makes the accumulation of this information and run forward at high speed, requiring an information technology supports this development. Another reason is that doctors do not have the time to search, access, and read as much information circulating, not to have the resources and skills to track, making the documentary and the protagonists informationists direct access and selection information.
This is why the demands and requirements of the Librarian Specialized Health Medicine area must be consistent with the requirements and demands of the discipline.
It examines how the documentary preparation have when entering the workforce specialized in medicine and the difficulties faced when it comes to search, select and retrieve this type of information, to provide its users an accurate document, according to the professional requirements requested.
Mastering English, managing databases, medical vocabulary, knowledge of anatomy, and highly specific subject of the documentary require preparation and specialized academic training. Whereas to enter the labor market does not have these essential tools for good performance, higher education should be largely to provide an academic level commensurate with the needs of librarians.
6
Scheithauer, Walter. « Islamische Schriftdenkmäler in Österreich : Überlegungen zu ihrer Erfassung und Erschließung ». Thesis, 2006. http://eprints.rclis.org/9496/1/islamische_Schriftdenkmale_in_oesterreich.pdf.
Texte intégralRésumé :
In Austria, there are many written documents in arabic script. The reason that they are not known properly is to be found in the lack of resources (personal and financial), ignorance and disinterest. The aim of this work is to find out how to locate these documents systematically and how to make them accessible. For this one has to ask: "Who could have come into contact with people who wrote in Arabic script?" and "Where could the documents and items have ended up?"
After archives and museums one has to look especially at monastery libraries and generally collecting libraries (in opposition to public libraries). Flukes and single occurrences can not be excluded.
The best is to make the results accessible in a relational SQL database with the trancription system of the Deutsche Morgenländische Gesellschaft.
7
Ortiz, Andrea Betina. « Colecciones hemerográficas y acceso a la información jurídica en la Hemeroteca de la Facultad de Ciencias Jurídicas y Sociales, de la ciudad de Santa Fe ». Thesis, 2015. http://eprints.rclis.org/25233/2/Colecciones%20hemerograficas.pdf.
Texte intégralRésumé :
The investigation's main subject is based on the collection of periodicals, and other resources such as reference materials and databases which belong to Hemeroteca de la Facultad de Ciencias Jurídicas y Sociales de la Universidad Nacional del Litoral. These are elements that provide a service of legal reference to which the community of users and investigators have a free access.
The work was established upon a normative theoretical framework, international guidelines applied to academic and research libraries, the Conspectus model, circulation and consultation data and opinions from experts based on other works. At local level the contribution of the Methodological Guide of Evaluations of Collections made by Universidad Nacional de La Plata is taken into account.
All that was mentioned before allows us to make an analysis of this collection in particular and consequently, to lay foundations on future actions to take part concerning this thematic.
8
De, Robbio Antonella. « La tutela giuridica delle banche nel diritto d'autore e nei diritti connessi ». Thesis, 1999. http://eprints.rclis.org/4012/1/dbthesis.pdf.
Texte intégralRésumé :
Final thesis discussed on the Course for Library Manager (January – June 1999), organized by University of Padua, Accademic Library.
All the thesis had been collected in a book edited by Maria Antonia Romeo.
9
Mazzieri, Marinella, Giovanni Michetti et Gaetana Cognetti. « Definizione, recupero e struttura del protocollo clinico : analisi e riflessioni per una condivisione dell'informazione biomedica su Web ». Thesis, 2003. http://eprints.rclis.org/5214/1/tesi_op_arch.zip.
Texte intégralRésumé :
Internet has led to new systems of information retrieval and diffusion in all fields, also in medicine. Health workers, patients and citizens can freely have access - on the Net - to useful information resources, like those concerning clinical protocols.
10
Batı, Hacer. « Elektronik Bilgi Kaynaklarında Maliyet-Yarar Analizi : Orta Doğu Teknik Üniversitesi Kütüphanesi Üzerine Bir Değerlendirme ». Thesis, 2006. http://eprints.rclis.org/7890/1/hacer_bati_tez.pdf.
Texte intégralRésumé :
In recent years there has been a rapid transition to subscription of electronic resources and significant percentages of library budgets are allocated to electronic resources. Identifying and analyzing the benefits and costs of this new trend is therefore relevant.
In this study we have considered the experiences of METU Library in utilizing electronic resources and provided a cost-benefit analysis of electronic resources based on the cost and usage statistics obtained from this library. The study examines the ScienceDirect, EbscoHost and Web of Science databases available within the METU electronic resources collection. In addition to the subscription cost statistics, non-subscription cost information obtained through interviews and surveys have been used in our analysis. Usage statistics of electronic information sources have been collected in accordance with the COUNTER standards and analyzed using various methods.
The high usage of electronic resources in METU reduces the unit cost of databases. According to the 2004 data, the cost per usage for EbscoHost and Web of Science is $0.3 $0.2 respectively. These figures place METU below the average unit cost per use of all Anatolian University Libraries Consortium (ANKOS) members. Yet due to high subscription cost, the unit cost per use of ScienceDirect is relatively higher ($2.3), even though the database is used very heavily at METU. This figure is above the average
unit cost per use of all ANKOS members for the ScienceDirect database. Statistics show that a small number of “core” journals satisfy significant amount of use while the majority of journals are used rather infrequently.
The results obtained from this study show that electronic resources cost, over the years, considerable amount of money for METU and their usage has also increased gradually.
In general, it can be concluded that electronic resources are heavily utilized in METU in terms of overall usage. In order to maximize the benefits of electronic resources it is necessary to analyze cost and usage statistics in detail at both institutional and consortial levels, using various techniques. The results obtained from such studies can be used as guidelines for the development of collections of electronic resources, consortial agreements and user education programs.
11
Tarlan, Mine. « Türkiye'de Akademik Tıp Kütüphanelerinde Kullanılan Elektronik Kaynakların Analizi ». Thesis, 2005. http://eprints.rclis.org/6468/1/mine_tarlan_yuksek_lisans_tezi_tamami.pdf.
Texte intégralRésumé :
This research is composed of, the history and the definitions of medical libraries as well as the variations and the definitions of the electronic resources that used in academic medical libraries. Regarding the research a survey has been applied to the libriaries which belong to the medical faculties throughout the country's state and private universities. In this survey under the following headlines data is obtained; variations of e-resources that used, library staff's background, published document's status, which e-resources mostly preferred and which qualifications of e-resources mostly stressed in making the preferance. After having the survey results, the outcome of the survey has been evaluated and inferences drawn. Following the first survey one year later second successive survey has been applied, recent results of the second survey has been comparetively evaluated and additional inferences drawn regarding the changes occured within one year.
12
Rodríguez-Yunta, Luis. « Ciencia y Documentación en español en el espacio virtual iberoamericano : Rol de las revistas científicas y desarrollo de nuevos productos electrónicos de información bibliográfica ». Thesis, 2010. http://eprints.rclis.org/15402/1/Tesis_LuisRodriguezYunta.pdf.
Texte intégralRésumé :
The thesis analyzes the role taken by both scientific journals and bibliographic information products, in the new relations between Spain and Latin American. The combination of technological development with the promotion of cultural and scientific relations in the Iberoamerican Community of Nations, form a virtual space, which defines the framework of the study. The research methodology is based on both quantitative and qualitative techniques. Despite the growing importance of scientific and academic relations, there is considerable room for improvement to seek greater inter-Iberoamerican scientific community. Internet facilitates scientific cooperation and online higher education in their own language. The publication of scientific journals is a communication channel which can be enhanced scientific exchange further by the international contribution of Hispanic, Iberian and Latin American Studies. Documentary resources focused on the national and regional scientific publications, make a wide range of products. Iberoamerican coverage, encompassing the sources of Spain, Portugal and Latin America, is emerging in the design of new sources of scientific documentation, enhanced by the facilities for dissemination via Internet. In the production of different resources from literature in Spanish language, the thesis highlights the work of the UNAM in Mexico (especially CLASE and PERIODICA databases) and the CSIC in Spain (ISOC, ICYT and IME databases). It also analyzes the system Latindex, Virtual Health Library, SciELO, Redalyc and Dialnet. These products are compared, concluding that the major databases are complementary and therefore there are possibilities for cooperation. Scientific information systems are essential to build the target of a Iberoamerican Area of Knowledge.
13
Rozo, García Hugo Alexander. « Diseño de la Red de Información Educativa de Bogotá (REDINED BOGOTA) ». Thesis, 2011. http://eprints.rclis.org/19037/1/Tesis%20Redined%20Bogota.pdf.
Texte intégralRésumé :
This work aims to create the design level of education information network in Bogota, which integrates higher education institutions that have the power or education programs, with the intention of forming a network, enabling visibility and provide institutional centralize production participating universities. This model took into account in design, interoperability and structure with the Spanish Information Network called "REDINED", which has more than 20 years working under the auspices of the Ministry of Education and Science of the country, with the idea of integrating and encourage other countries to join such initiatives.
As good practice was reviewed for "Reduc", Latin American Network for Information and Documentation on Education, which was administered by Universidad Pedagógica Nacional but unfortunately at this time not operate.
14
Cruz, Rodriguez Jorge J. « Herramientas de la Web 2.0 aplicadas a la Biblioteca Virtual UCV Caso : Facebook ». Thesis, 2011. http://eprints.rclis.org/23921/1/tesis.pdf.
Texte intégralRésumé :
We analyze the study of Web 2.0 tools in the specific case of the social network Facebook Virtual Library applied to UCV. The study was carried out in three phases: 1) Obtaining information on the early evolution of the Internet and the same; 2) Use of social networks and applications found for libraries; and 3) Analysis of the statistics that reflect the using this social network and x visibility has contributed to the Virtual Library UCV. To the Virtual Library of the Universidad Central de Venezuela has been a great support communication using social networks, especially Facebook, as it has been
shown to increase the visibility of the Library.
15
Silva, Dionísio Demesio da. « Desinformação e fake news na Ciência da Informação : representações da produção científica na BRAPCI ». Thesis, 2019. http://eprints.rclis.org/43859/1/Desinforma%C3%A7%C3%A3o%20e%20fake%20news%20na%20Ci%C3%AAncia%20da%20Informa%C3%A7%C3%A3o.pdf.
Texte intégralRésumé :
The terms disinformation and fake news are relatively contemporary. BRAPCI is a base with productions focused on Information Science. Excerpts from academic productions, comprised in the period of records in the database from 2000 to 2019, show that the authors have been addressing at least one of the terms. Therefore, there would already be something consolidated: definition, mediation, contingency, etc. On the other hand, these relationships can influence the career of the future Information Manager graduated from UFPE. However, the aim is to: identify the documents (productions) in the database, through a direct search expression using the terms: (disinformation) and (fake news); identify the productions in BRAPCI; find definitions of terms; check the frequency of use of terms; and, present them with quotations, tables, charts and graphs. Therefore, the methodology consisted of exploratory bibliographical research supported by bibliometric inferences. Therefore, promote academic and professional debate on the eventual use of such terms. Some conclusions were reached: 1. the term fake news was recovered from the year 2017; 2. the terms take extraordinary forms and dimensions, conditioned to the actions: production, communication and social flow of information. ‘Use’ is the only less technological part, as it largely stems from human cognition. Finally, it is understood that the Information Manager must interact with the appropriate Information Competence.
16
Tuso, González Fabio Ernesto. « Diseño e implementación de una videoteca digital para la Facultad de comunicación Social de la Universidad Santo Tomás ». Thesis, 2012. http://eprints.rclis.org/31470/1/Tesis%20de%20Grado.pdf.
Texte intégralRésumé :
With the rapid growth of technological advances at the global level,
In the treatment of information, associated with the technologies of the
Information and communication (ICT), specifically with the management of
Audiovisual information in digital format, today it is possible to
Agile, efficient and timely processes for the management of new
Products and services in libraries, archives and documentation centers,
Developing content adapted to the real needs of
Users, transforming traditional face-to-face services into new and
New services offering other forms of relationship and communication with
the same.
In the average in which information professionals and documentation
Knowledge and tools for
Administration, management and publication of information in digital environments,
Dynamic Web pages, Web 2.0. And management tools
Content; The development of implementation-oriented research
Of a digital video library as an electronic resource of any unit of
Information, is presently propitious as a showcase for promoting new and
Novel scenarios, where the librarian should develop and be
Pioneer in the implementation and implementation of these resources.
The objective of this research is to design and implement
Faculty of Social Communication of the Universidad Santo Tomás a
Digital Video Library, with the aim of disseminating and making available to the community
Videos produced by students during their training
Through the implementation of a technological tool that
To access, transmit, and distribute this information
Developed and produced by this University. In addition to understanding this
Research as a significant advance in librarianship in the field of
Global and national level by being at the forefront of information management in
Audiovisual and digital format.
Thus, the present research arises from the role of the librarian
As a fundamental piece in the management of information and as a changing entity
Digital contents, this and from the progressive
The digitization of information, which has undergone changes in the formats
Textual, sound, graphic or audiovisual (moving images), and that
Today it is possible to manage and store together.
Topic that Currently being worked by information professionals and where
The new horizons are constantly being questioned in aspects such as: Media, information structure, digital repositories, copyright,
Web 2.0., Social interaction, new librarian scenarios, etc.
Therefore, the present work of degree has as
Implementation of the video library by means of an analysis of the current state of
Digital video libraries worldwide, highlighting technologies
Applied for the processing of audiovisual information, evaluating the
Tools according to the design and implementation of the same,
An initiative for the future implementation of a video library in the field
National and international level and strengthening the role of the librarian in the
Of new information technologies and documentation. In this sense
The work develops the following chapters: first: definition and
Delimitation of the problem; Second: theoretical and referential framework which
Encompasses the whole conception theory of the subject characteristics, concepts and
Applied technologies; Third: develops the implementation of the video library,
Which emphasizes the diagnosis and planning of the video library; fourth:
Evaluation of technological tools with everything related to
Methodology of evaluation and comparison of content managers; fifth:
Design and implementation of the video library comprising the installation,
Design of the interface, validation, testing, policy definition,
Accessibility features, W3c validation, statistics tracking,
Cataloging or description of materials; Sixth: disclosure with
Concerning the marketing plan, objectives and market strategies;
Seventh: it covers the evaluation and analysis of the video library which
Discuss the results from a representative sample of the
Academy, finally the degree paper presents conclusions and
Recommendations of the same
17
Guerrero, Carrasco Gustavo. « El uso de las bases de datos de la biblioteca del Instituto de Investigaciones Bibliotecológicas y de la Información de la UNAM ». Thesis, 2017. http://eprints.rclis.org/43699/1/El%20uso%20de%20las%20bases%20de%20datos.pdf.
Texte intégralRésumé :
Information technologies are a fundamental part today within a library or information center, with the passage of time these centers or libraries must make use of these tools and resort to updating methods in order to maintain an optimal level in its heritage and increase the scope of information produced worldwide, this is thanks to the adaptation of information and communication technologies. The information centers make use of this important tool since, being for a specific user community, the databases also have special characteristics according to the needs that these users present. The objective of this study is to determine the level of use of digital resources, in this case the databases that are accessed by the agreements maintained by UNAM or those that are open access, this study is carried out carried out at the Library and Information Research Institute of the National Autonomous University of Mexico. The most relevant thing in this study will be to be able to identify who are the users (academic technicians or researchers) who make the most use of this information resource and the frequency in the usability of said databases to support themselves in the development of their research activities.
18
Hípola, Pedro. « Información digital y actividad económica : carencias y avances en España durante el período 2007-2010 ». Thesis, 2012. http://eprints.rclis.org/19232/1/Informacion_digital_y_actividad_economica_Carencias_y_avances_en_Espana_durante_el_periodo_2007-2010.pdf.
Texte intégralRésumé :
Digital information and economic activity: gaps and progress in Spain during the period 2007-2010
In this dissertation we evaluate some of the progresses and gaps that can be observed in the supply and delivery of digital information for economic activity in Spain during the period 2007-2010 from four different viewpoints.
These four study areas are:
- the Spanish e-Administration as an energizing factor of all national economic sectors, and the digital information market in particular;
- the contribution made by the Spanish Chambers of Commerce in digital information for economic activity;
- changes, gaps and progresses made in the provision of digital information to the agricultural sector;
- the presence of subjects related to the information on economic activity in the curricula aimed to train information professionals at the Spanish universities.
To put in context the research work, we have also analyzed the development and current status of each of the four study areas.
The dissertation highlights the importance the Spanish Public Administration has had in the past, and still has, in the development of the electronic information industry in Spain. Contributions made by private initiatives are also discussed.
Furthermore, in the four study areas we observe dynamics which take place at very different speeds. This depends on the contribution of the actor or group of actors involved in each case. Particularly notable was the low presence of information on economic activity in the curricula aimed to train information professionals in Spanish universities.
19
Jayakrishnan, J. S. « Kerala Public Library Network : A Project Report ». Thesis, 2013. http://eprints.rclis.org/20451/1/KPLNET.pdf.
Texte intégralRésumé :
Public library systems in India are not so effective due to lack of efficient resource sharing and networking to achieve optimum utility of resources as well as to provide need based services. The present library system can be improved by application of ICT and enabling participation. A Kerala Public Library Network (KPLNET), and use of an integrated library automation package in all public libraries can achieve this. The web portal of the Public Library Network maintained by Kerala State Library Council the controlling organization can extend the use of resources and accessibility of the system transcending time and space. Sharing of resources will be much easier through KPLNET. Public can easily access the services through this system for borrowing books, searching of catalogue, e-reading etc. KPLNET can provide the public easy access to the data online. Through multi user licences to acquired content, and introducing resource-sharing programmes the public libraries can reduce their expenses and boost the services. The individual village libraries can develop content on local aspects, which can be pooled by KPLNET. The major objective of the KPLNET will be to unite all public libraries in the State under a single umbrella. Kerala State Library Council (KSLC) controlling more than 7000 public libraries will be the implementing agency for KPNNET. KSLC can perform more effectively once it implements the proposed KPLN. This project suggests e-governance of public libraries under KSLC with a library network using a web enabled system that act as an interactive public interface to enable the public for participation in governance of libraries and also for effective utilization of the library resources.
20
Bejarano-Ballen, Juan S. « Análisis de los altos cargos de la Generalitat Valenciana ». Thesis, 2017. http://eprints.rclis.org/31994/1/TFM_Juan_Sebastian_Bejarano.pdf.
Texte intégralRésumé :
The high positions are the political base of the public administration in our country. The citizen knows them fundamentally, through the means, but this image provides a fragmented vision. The websites of the administration offer complete information about them and their competencies, but as a snapshot, of the corresponding legislature. So where is the map of the political power of an administration throughout its history? Nowhere. The dispersion of this information, so significant, and the lack of understanding may be acting to the detriment of the transparency of governments. The interest of the citizens in the politics and in the actions of the politicians supposes a social change in which the maximum is the transparency and the accessibility to the information of public character in a clear and organized form.
The project proposes to build an automated methodology and a prototype of a graph based on this information from unstructured sources that is useful for citizenship and administration in order to relate and organize the information of the Generalitat Valenciana. The model with the data that support it will be released for later reuse and adaptation to other administrations.
21
Diago-Gonzalvo, Sara. « La contratación pública al detalle. Comparador de las licitaciones ofertadas ». Thesis, 2017. http://eprints.rclis.org/31774/1/TFM_SARA_DIAGO_MUGI.pdf.
Texte intégralRésumé :
Public procurement in Spain accounts for about 20% of the country's Gross Domestic Product. The large amounts of money that are moving in this area and the growing social concern about knowing what the public money is invested forces administrations to adopt measures on transparency and openness of public data. It is in this profile, in which this work is framed, on the one hand, does the public know how transparent the public administration is, and on the other hand, the administration knows what the optimal characteristics for each contract?
The obstacles to comparing this type of information are based on the lack of details of the contracting portals, the different categorizations, the normative plurality and, in short, the difficulty of access to information.
The information of the tenders is mostly published in the different portals of contracting of the Autonomous Communities, in addition to the national portal of public sector contracts. Even so, there remains a great difficulty of access and understanding.
These evidences demonstrate that the development of this project will be relevant for the target audience. In a bid for the transparency of public administrations, the re-use of bidding data and public sector contracts and the improvement of access to information by citizens, proposes the creation of a technological tool capable of making comparisons between contracts and find the existing relationships.
An advance of this project was presented to "Challenges Contribute 2017: The value of the data for the Administration" being selected as one of the ten finalists in Phase I of the 45 projects presented. Phase II of the Challenge will be held in the month of October of this same year.
22
Pinto, Nelson Miguel Costa. « Database-Based IP Network Routing ». Master's thesis, 2018. http://hdl.handle.net/10362/55169.
Texte intégralRésumé :
The Software-Defined Networking (SDN) approach has the goal of simplifying network
management. SDN uses a logically centralized approach to enable simpler network
programmability and simplify the network architecture. SDN is in general associated
with the OpenFlow protocol, which standardizes communication between a controller
and network devices. Alternatively, a database approach could be used to tackle data
exchange between controller and network devices. This solution requires the installation of a database server inside each switch, and replicas of those local switches databases, in the controller. The database approach offers several potential advantages over OpenFlow such as higher level of abstraction, flexibility and the use of mature implementations of standardised database protocols to propagate information events and commands.
The purpose of this work is to apply a Database-Based Control Plane (DBCP) for SDN
networks on a wide area environment. The objective is to implement a replacement of
the control plane of a wide area network, currently achieved using a link-state protocol
such as OSPF or IS-IS, by an SDN approach based on similar techniques as the ones used in [4].
We conducted an experiment, which we called IP-DBCP, that consisted of the definition
of data models and the construction of an SDN network with database replication as
the means of communication between one controller and multiple switches. To this end,
a switch was developed, using OpenSwitch software as a logical hardware layer, that is capable of executing a MySQL database management system, load it with its characteristics and collect data related to its network neighbourhood. A controller was also developed that executes a MySQL database management system with the replicated databases of all switches. The controller uses those replicated databases to construct routing rules, using a shortest-path algorithm. Ultimately we tested the correct functioning of the solution and evaluated the convergence time by performing network state changes and compared the results with the ones found in traditional link state protocols.
23
Neves, Nuno Miguel Mendonça Correia das. « Database Replication applied to Network Management ». Master's thesis, 2018. http://hdl.handle.net/10362/61550.
Texte intégralRésumé :
Software Defined Networking (SDN) is a recent approach used to manage networks. Most
of the time it is paired with OpenFlow, a low-level communication protocol used by
controlling and switching devices to communicate. Since it is low-level, it does not grant
the possibility to explore all the switching functionalities, especially as they get extended
with more and more features.
It is therefore required to find alternative ways of coordinating controlling and switching
devices without resorting to low-level protocols to be able to access those functionalities.
One of the possible approaches, which was recently implemented in a data center,
uses databases and its respective replication to store and exchange information between
the devices. Applying the same approach to manage wide area networks would provide
a more flexible way to control them.
The goal of this work consists of improving an existing prototype that simulates a
small network. It was built originally using a SQL database and an asynchronous external
replication software. We replace them with a NoSQL database that natively supports
replication, which enables us to remove unnecessary software from the prototype while
taking advantage of the database features.
Some of the features, the more notable being non-uniform replication with the help
of CRDTs, are used to improve network monitoring, which is a recent addition to the
prototype. Network monitoring is a highly important component of network management
that facilitates decision making processes.
We evaluate the new version of the prototype by comparing with directly with the old
version. We collect the convergence time of the network after an event on a device triggers
a modification in its state to help with the comparison. By splinting the convergence time
into a sum of smaller actions, we take conclusions regarding different moments of the
convergence process.