the conceptual data model

... would you describe the role of the author with respect to the paper, e.g The author _ _ s The author is user the paper, or of the paper? walter_of Can the author be the writer of other papers? ~ ... Each of these dictionary entries has five components The first is the name of the word, the second is the propositional meaning, the third a variable denoting time, the fourth specifies the semantic ... purposes 6.1 Conceptual Modelling from NL Text The goal of conceptual modelling is to identify the significant objects and relationships in the application universe of discourse As with other NLU...

Ngày tải lên: 09/03/2014, 01:20

... presents the data model Section describes the attribute type system Section describes how the query language can be extended with user-defined procedures Section compares the model with other data models ... is to move the computation that constructs the mainmemory data structure to the database process Suppose the procedure MakeForm built the data structure given the name of a form Using the parameterized ... referenced elsewhere in the query If the reference is in the target-list, the return tuple will not contain the attribute.2 If the reference is in the qualification, the clause containing the qualification...

Ngày tải lên: 28/04/2014, 13:32

... by the theory of relations  We review the essentials of the relational approach in this chapter Relational Model Concepts  The model was first proposed by Dr E.F Codd of IBM in 1970 in the ... Data is based on the concept of a Relation  A Relation is a mathematical concept based on the ideas of sets  The strength of the relational approach to data management comes from the formal foundation ... Relational Model Concepts  Relational Model Constraints and Relational Database Schemas  Update Operations and Dealing with Constraint Violations Relational Model Concepts  The relational Model of Data...

Ngày tải lên: 12/05/2014, 11:55

... need the help of the TableAdapter here, because we’ll write our own ADO.NET interface code to connect to the database and get the data All we want from the wizard is the dataset with the data ... to the data source and make a call to ExecuteReader() to open the data reader stream for the DataReader object Finally, a DataReader object is used to get the data that is streaming from the data ... return a data reader stream into the DataReader (drReport) object The next line is a special call to the Load() method from the dataset This call will read the data from DataReader to the table...

Ngày tải lên: 05/10/2013, 08:48

... traditional data modeling as well as some familiarity with the UML Database The Database is the system for data storage and controlled access to stored data It is the biggest element a data model supports ... With the data modeling for UML profile, the UML fully supports data modeling needs It allows the support of software development and data modeling with one unified language Using the UML data modeling ... supports The relational database is the standard database supported by the Data Modeling UML profile An object relational database, an extension of the relational database, is also supported by the...

Ngày tải lên: 10/12/2013, 15:15

... for the ‘Training data We selected a further 104 websites to be used to validate the segmentation – ‘Validation data 4.2.3 Obtaining the data and calculated the metrics We completed the data ... providers The interactions are described in the model below, Figure 4-4 Figure 4-4: The actors and their relationships who have a role in the websites Further researching the actors, the extreme ... each of the pilot sites used to test the model The following sub sections outline the components of the model as shown in Figure 4-3 and are summarised as follows: •  he key actors in the market...

Ngày tải lên: 06/03/2014, 21:20

... relational model Resolution Ltd Xcase Conceptual modeling up to code maintenance Sybase Enterprise Application Suite Data modeling, business logic modeling Visio Visio Enterprise Data modeling, ... Oracle Developer 2000 and Designer 2000 Database modeling, application development Popkin Software System Architect 2001 Data modeling, object modeling, process modeling, structured analysis/design ... relationships Higher-order relationships discussed further in Chapter Data Modeling Tools A number of popular tools that cover conceptual modeling and mapping into relational schema design Examples:...

Ngày tải lên: 12/05/2014, 11:55

... schema The OME database Figure The Image element in the OME file schema The Image element in the OME file schema The data elements that define the an image in the OME file are shown These include the ... by accessing the STs for the inputs and outputs within an OME database (b) The DataManager, DatasetBrowser and 5DViewer The DataManager shows the relationships between Projects, Datasets and ... Images within an OME database The DatasetBrowser modifies the display method for images within a given dataset depending on the values of data stored as STs within an OME database The 5Dviewer allows...

Ngày tải lên: 14/08/2014, 14:21

... the forcing terms to the numerical model The generated water levels propagate according to CHAPTER INTRODUCTION the numerical rule from the open boundary to the model domain In tide theory, the ... makes data mining less convincing to the researchers who wonder about the science still undiscovered in the data With the objective to take the best of both numerical models and observed data, ... variational data assimilation corrects the initial conditions of the model in order to obtain the best overall fit of the state to the observations based on all CHAPTER INTRODUCTION the data available...

Ngày tải lên: 11/09/2015, 10:15

... XML data are stored in an objectrelational database 1.4 Thesis Overview The rest of the thesis is organized as follows Chapter introduces some of the main data models for XML data as well as the ... is named dataguides Dataguides are derived from instance data A dataguide can only describe the nested structure of the data The other semantic information cannot be modeled using a dataguide ... the attribute value must be included in the element On the other hand, the keyword 15 Chapter Data Models for XML Data #implied indicates the attribute does not have to be included Finally, the...

Ngày tải lên: 16/09/2015, 17:14

... Three data models were chosen for the test: the relational data model for the logical level, the object-oriented (OO) data model and the United Modeling Language (UML) model both for the conceptual ... 3-1 The research model The data model refers to the data model structure, the operations and any constraints on the operations It affects the way a user views and manipulates the data in the database ... Variables The independent variable is the abstraction level of the data model / query language The data abstraction level is set to be either the conceptual level or the logical level The conceptual...

Ngày tải lên: 28/09/2015, 13:21

... object, and pass the file name to the domOne object The domOne object creates a parser object, parses the document, then processes the DOM tree (aka the Document object) via the printDOMTree ... Shakespeare The Document node The Element node corresponding to the tag A Text node containing the carriage return at the end of the tag and the two spaces in front of the ... tag The Element node corresponding to the tag A Text node containing the carriage return at the end of the tag and the four spaces in front of the tag The Element...

Ngày tải lên: 30/09/2013, 04:20

... expressionField.Text); This code adds the expression columns to the sample table, passing the column name, the data type from the System namespace, and the field expression Run the program On the Add Expression ... expressionField.Text) This code adds the expression columns to the sample table, passing the column name, the data type from the System namespace, and the field expression Run the program On the Add Expression ... value from the user and then uses it as the primary key lookup value in the application’s sample DataTable Most of the code exists to ensure that the user provides a valid ID Locate the Try Catch...

Ngày tải lên: 03/10/2013, 00:20

... component ■■ Auto-update the model If the underlying database objects change in a way that affects the model, you can refresh the model by using the Update Model From Database shortcut command ... ADO.NET Entity Data Model as the new item type then click Add When the wizard appears, select either Generate From Database or Empty Model Complete the wizard steps and modify the model as needed ... entity Open the Model Browser panel Expand the conceptual model portion of the browser tree Right-click the Complex Types branch then select Create Complex Type from the shortcut menu Rename the new...

Ngày tải lên: 03/10/2013, 00:20

... file://C:/javascript/DisplayEmployeeData.html ?data. xml DisplayEmployeeData.html is the name of the example file, and data. xml is the name of the XML file it uses The XML file must contain data formatted like ... includes the node and all of its children selectNodeContent( ) sets the start of the range to the position before the first child of the node and sets the end of the range to the position after the ... e.getElementsByTagName("salary")[0].firstChild .data; // Now that we have the employee data, use methods of the table to // create a new row and then use the methods of the row to create // new cells containing the data as Text...

Ngày tải lên: 05/10/2013, 13:20

... a matchmaker: the message type (sometimes called the speech act) and the content The former denotes the intent of the message (e.g., query or assertion) while the latter denotes the information ... only on average: the amount the producer receives in any single transaction may be more or less than the amount paid by the customer, and the broker pays or receives the difference The Internet ... either of them The Internet services of the future should aim at exactly the opposite with tailor-made services (and interfaces) for every individual user as the ultimate target Neither the suppliers...

Ngày tải lên: 05/10/2013, 13:20

... Designing Data Services and Data Models Module 3: Using a Conceptual Design for Data Requirements Module 4: Deriving a Logical Data Design Module 5: Normalizing the Logical Data Design In the next ... might be used in a logical data model Lead-in The following slide shows how primary and foreign keys might be used in a logical data model The slide shows a logical data model with primary and foreign ... Normalizing the Logical Data Design Activity 5.2: Deriving the Third Normal Form for a Logical Data Model Normalization Basic Activity 5.1: Identifying Keys in the Logical Model Module 5: Normalizing the...

Ngày tải lên: 16/10/2013, 13:15

... the relationship The obvious result is the increase in the data that needs to be transmitted 5.5 Advantages of the OSI Reference Model The major advantage of the OSI Reference Model lies in the ... substantial 5.6 The Seven Layers of the OSI Reference Model 5.6.1 Layer 1: The Physical Layer The Physical Layer is responsible for the actual transmission of the data and the provision of the necessary ... 5.6.2 Layer 2: The Data Link Layer The Data Link Layer is responsible for the packaging of the data to be transmitted The data are combined into packets or frames and then handed to the Physical Layer...

Ngày tải lên: 19/10/2013, 03:20

... σ In general, the volatility of the forward price equals the volatility of the spot price; the volatility of the futures price equals the volatility of the underlying stock if the interest rate ... T N[d2 ]} = S0 − B0 where the first line is the Black Scholes formula and the second line represents a replicating portfolio The model can therefore be interpreted as the recipe for replicating ... 0.4 × σ T % as the price of an at -the- money-forward option, i.e one where the strike price equals the forward price 55 The Black Scholes Model √ √ If X = F0T in equation (5.1), then we have d1...

Ngày tải lên: 25/10/2013, 19:20