software performance and scalability a quantitative approach

... Trang 1VIETNAM NATIONAL UNIVERSITY, HANOIINTERNATIONAL SCHOOL GRADUATION PROJECT ANALYZE AND FORECAST SALES FOR SEVERAL KIOSKS AT NOI BAI AND TAN SON NHAT AIRPORTS USING A QUANTITATIVE APPROACH ... Tableau and Python, a powerful data visualization tool that supports interactive and dynamic dashboards Exploratory Data Analysis (EDA) 2.1 Exploratory Data Analysis (EDA) EDA was conducted to uncover ... Criterion (AIC) Trang 20ARIMA was particularly effective for generating forecasts in datasets with strong seasonal and trend characteristics, making it a valuable tool for operational planning and inventory

Ngày tải lên: 15/04/2025, 23:32

... component and is normally stored on a backing store medium, such as disk.) A manager component is an abstract data type, maintaining data and the operations that can be used on it. The classical examples ... data should be minimized (or preferably abol- ished) and the local data maximized. Nowadays most programming languages provide good support for local data and some do not allow global data at ... data, data can, of course, be shared by passing it around the program as parameters. Here is the argument against global data. Suppose that three components named A, B and C access some global

Ngày tải lên: 03/07/2014, 01:20

... is the same and the coupling is strong because a fault that appears in one component may be caused by another 4 Shared or global data Shared data is data that two or more components have access ... This contrasts with a single, multi-purpose method Arguably this modularization is easier to understand and maintain Trang 26 Method calls with parameters that are pure dataHere we have a form of ... most oper-ating systems Within the Java library, the classes java.io.PipedInputStream and java.io.PipedOutputStreamallow a producer object (data source) to send a serial stream of data to a consumer

Ngày tải lên: 03/07/2014, 01:20

... abstraction As an analogy compare the problems of understanding a plate of spaghetti as com-pared with a plate of lasagna In order to understand the spaghetti, we have to under-stand it all; we cannot ... down in a chain of method calls One way of handling the error is to create an additional parameter associated with each method call This approach can become very unwieldy as methods receive and merely ... programming) Standardization Domestic appliances exhibit enormous variety and yet all plug into a standard socket Similarly, it is desirable to build software from components that all exhibit the same external

Ngày tải lên: 03/07/2014, 01:20

... Although a program that uses the three structures may have abstraction of control, it may well have global data This seriously weakens the abstraction, since at any level of detail all of the data has ... follows: A window displays a defender and an alien (Figure 8.1) The alien moves sideways When it hits a wall, it reverses its direction The alien randomly launches a bomb that moves vertically downwards ... is to see that at any stage of decompo-sition the solution is expressed in terms of operations that are assumed to be available and provided by an abstract (or virtual) machine, like a very high-level

Ngày tải lên: 03/07/2014, 01:20

... The difference between a data store and a data flow is that a data store is static (it does not move). Drawing the data flow diagram for a proposed piece of software is a vital step in the method. ... data flow for the log file is omitted from the above data flow diagram. Add this data flow. The first and most crucial step of data flow design is drawing the data flow diagram. Such a diagram ... streams facility in Java) support this “filter and pipe” software architecture. This means that we can directly implement a data flow diagram as a series of filters and pipes. However, if pipes are

Ngày tải lên: 03/07/2014, 01:20

... structures of all the input and output streams So we draw a data structure diagram for each input and output file and then devise a program structure that incorporates all aspects of all of the data structure ... input Summary Data flow design proceeds by initially analyzing the data flows and transformations within a software system The first task is to draw the data flow diagram (bubble diagram), consisting ... for each new level This transformation is straightforward and mechanical We have now arrived at a program design capable of being readily translated into most conventional programming languages

Ngày tải lên: 03/07/2014, 01:20

... these characteristics can be regarded as advantages, they can also be seen as a challenge to the traditional skills associated with programming It is also highly con-tentious to say that data structure ... non-inspirational and rational In particular, some of the steps arguably require a good deal of insight and creativity, for example, drawing the data structure diagram, identifying the elementary operations ... tolerate the performance penalties 2. use an operating system or programming language that provides the facility for programs to exchange serial streams of data 3. transform one program into a subroutine

Ngày tải lên: 03/07/2014, 01:20

... advantages as compared with a software tool. They are cheap, read- ily available and portable. Several people can easily collaborate, standing round the 11.5 ● Class–responsibility–collaborator ... the availability and widespread use of programming languages that fully sup- port OOP – such languages as C++, Ada, Smalltalk, C#, Visual Basic.Net and Java. A number of OOD methodologies have appeared ... identifying classes and methods, we can document each class as a UML class diagram. This type of class diagram shows more detail about a class than those we have met so far. A large rectangle contains

Ngày tải lên: 03/07/2014, 01:20

... These patterns are available for off-the-shelf use, just as classes are available in class libraries. Software engineering patterns are patterns on a larger scale than the simple program seen above. ... Suggest features for a software tool that would support the creation, storage and editing of class diagrams. 11.9 Suggest features for a software tool that would support the creation, storage and editing ... As well as architectural structure, patterns are available for such domains as user interfaces, file systems and multithreading. Patterns are also provided for activities such as testing and project

Ngày tải lên: 03/07/2014, 01:20

... return x; } Encapsulating data makes it clear how data is being accessed and by whom Data declared as public can be accessed by any part of the software in an uncontrolled fashion Encapsulation is ... the central features of OOP This refactoring can always be used on any public data and its implementation is straightforward 13.2 ● Encapsulate Data Trang 10A method is written within a class, but ... during software development, particularly OO development, and explains how to recover from these situations Easy to read, enjoyable and refreshing: William Brown, Raphael Malveau, Hays McCormick and

Ngày tải lên: 03/07/2014, 01:20