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Elmasri Ramez Navathe Shamkant B Sistemas de Banco de Dados Pearson 6 karcodicdistwha.ml; UFF; CS - Spring Fundamentals of Database Systems (6th Edition) Ramez Elmasri. out of 5 stars Sistemas de Banco de Dados Ramez Elmasri. Paperback. karcodicdistwha.ml - Free download Ebook, Handbook, Textbook, User Guide PDF files on the internet. A Savasere, ER Omiecinski, SB Navathe. Georgia Institute Sistemas de banco de dados MC Brandon, MT Lott, KC Nguyen, S Spolim, SB Navathe, P Baldi.
The original data is remapped into a new coordinate system based on the variance within the data. PCA applies a mathematical procedure for transforming a number of possibly correlated variables into a smaller number of uncorrelated variables called principal components. The first principal component accounts for as much of the variability in the data as possible, and each succeeding component accounts for as much of the remaining variability as possible.
PCA is useful when there is data on a large number of variables, and possibly there is some redundancy in those variables. In this case, redundancy means that some of the variables are correlated with one another.
And because of this redundancy, PCA can be used to reduce the observed variables into a smaller number of principal components that will account for most of the variance in the observed variables. PCA is recommended as an exploratory tool to uncover unknown trends in the data. The technique has found application in fields such as face recognition and image compression, and is a common technique for finding patterns in data of high dimension.
This lets the user work with the tool without having to install and configure it. Technologies used with this tool are HTML5 in the front end of the tool, which will be extensively used to provide the best user experience, as well as features such as drag and drop. The tool has two modules: one responsible for managing the tables and the other responsible for the management of queries in Relational Algebra. The module responsible for managing the tables is illustrated in Figure 1.
As the illustration shows, the user can either create a new project, open an existing project, or save the open project. In this module the user can create tables by clicking and dragging the corresponding component to a table that is available in the component palette Figure 1-A.
Figure 2 shows the screen for the query management module in Relational Algebra. In this figure a projection operation is shown to exemplify the use of the proposed tool.
To perform a query, the user must choose the operation and drag it to the query area Figure 2-A. After choosing the desired operation, the user can choose the relation that will be used in the query Figure 2-B. After choosing the relation the user can highlight the attributes to be projected. Module responsible for management of queries.
Figure 3. Query Example using the selection operator. Figure 4. Example query with more than one condition in the predicate. The result of the query performed is displayed at the bottom. This result can be dragged into the relations area to be used in another query later on.
In this way, it is possible to carry out consultations with many step-by-step operations, facilitating the understanding of the students. After familiarizing themselves with Relational Algebra operations, students will then be able to perform nested queries directly in the area for queries.
In Figure 3 a query is shown using the selection operator. This is done quite intuitively because the user chooses the attributes and operators with a few clicks. The presentation of the proposed tool clearly shows that it aims to be simple and intuitive, relieving users of the need to be concerned about syntax and notations.
It allows querying in Relational Algebra, as well as creating, deleting and updating tables.
Besides being textual, the user must learn the specific commands of the tool, which differ from those found in reference books of the area.
The tool proposed here aims to create, delete, update and query Relational Algebra in a graphical and intuitive way, making the learning process more pleasant.
The software has an intuitive interface, however, to be executed in the desktop environment, the user must perform tasks related to the installation and configuration of the tool for it to execute. In our model, the proposed tool is executed in a web environment, and there is no need for the user to perform installations and configurations. In the work of Appel and Traina Jr.
Constructivism proposes the construction of knowledge through the interaction of the student with the computer. In this context, the teacher becomes a mediator who participates in this learning process.
Several factors can contribute to errors in segregation.
Among them is the lack of specific knowledge on BW by the professionals who generate and manipulate it and the minimal importance normally given to BW by these same professionals compared to other tasks they perform. There are also behaviour patterns derived from the similarity between household waste and biomedical waste that lead individuals including health professionals to dispose of BW generated at home together with common waste.
Common examples are diabetic patients - who take injectable insulin daily - and injectable drug users, who generate piercing and cutting waste that is usually disposed of together with common household waste. Household wastes and wastes inadequately disposed of in health facilities due to the poor management of BW in Brazil lead to several problems that can affect the health of the population and the health of workers who have direct contact with these wastes 3.
BW constitutes a favourable environment for many organisms, which can become vectors and reservoirs of various pathologies capable of transmission by rodents, insects, and other animals. This fact makes special handling of BW mandatory, including specific types of treatment and disposal. As early as , studies confirmed the presence of pathogenic microorganisms in BW. The most common are enteric gram-negative bacilli coliforms, Salmonella typhi, Shigella sp.