Unified Modeling Language (UML)

UML (Unified Modeling Language)

● UML is a language for the standard model development of software blueprints. 

● Language is the language models have a dictionary of words and rules-based the conceptual and physical picture of a system 

● UML as the language of the model states how to make and read a model correctly, but does not state the model what to make and when should made

Role of UML 

UML is a language for 

● Visualization 

- Describing the ideas in notation and semantics more easily understood by anyone 

● Specifications 

- Specification of all important decisions analysis, design, and implementation should be taken in the development and deployment of software systems

● Construction 

- UML is not a visual programming language 

- UML models can be connected directly with several programming languages 

- Forward engineering: generating code from models 

- Reverse engineering: building a model of the code 

● Documentation 

- UML includes documentation and system architecture detailed 

- For a language to express needs and testing. 

- UML provides a language for planning activities project and release management

Structural Things

● Structural thing is a noun models UML 

- Class 

● An overview of a set of objects that share attributes, operations, relationships and semantics are the same 

● A class implementing one or more interfaces 

- Interface 

● A set of operations stating the services of a class or component 

● An interface describes the behavior of objects provided to outside parties. 

● Interface can only declare some or all the behavior of a class / component.

● Collaboration 

- An interaction and a set of rules and elements others who work together to provide behavioral working together 

- Declare the application of pattern forming systems 

● Use Case 

- An overview of a set of action sequences occurs in a system that produces a value the actor 

- Used to menstrkturkan system behavior in a model 

- It is the realization of collaboration.

● Active Class 

- A class to which the object has one or more process / thread activity so that it can start controls 

● Component 

- A physical and replaceable part of a system provides the realization of a set of interfaces 

- Declare the physical package than logic elements, such as classes, interfaces and collaboration 

● Node 

- Physical elements that exist at run time and expresses a sesumber calculations, which memory and processing capabilities

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The Role of Information Systems and Information Technology

The role of information systems and information technology for the future of the organization:

1. Support the business processes and operations and organization. 

2. To support the decision making of employees and managers.

3. Support a variety of strategies for organizational competitive advantage.

The role of information systems in organizations:

1. Support the major functional areas of the organization important in the success of a business, such as accounting, finance, operations management, marketing and human resource management (HRM). 

2. Top important in operational efficiency, productivity and employee morale and customer service and satisfaction.

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STRUCTURING SYSTEM REQUIREMENTS

LOGIC MODEL MAKING
Previously, we have studied how the change process  data into information is a vital part of the system information. The best possible data flow diagram or DFD identify processes, DFD is not good enough to show logic contained in a process. In fact, at the level DFD primitive does not show the processing steps fundamental. What happens in the process? how the data input is converted into output information? Since the DFD is designed not to show the detailed processing logic, you must create a logic model of the process using other techniques. this discussion talk about the techniques you use to make logic model process. First, you will be

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Computer Crime

COMPUTER VIRUS
Computer virus is a computer program that can duplicate or copy itself and spreads by inserting copies of itself into other programs or documents. Computer viruses can be analogous to a biological virus, which spreads by inserting itself into selmakhlukhidup.
Computer viruses can damage (eg by corrupting the data on the document), make computer users feel disturbed, or no effect at all.

SPAM

Spam or junk mail can also be shaped is the abuse of electronic messaging systems to send news ads and other purposes in bulk.

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System Development

The system needs to be repaired or replaced due to:
1. The problems that arise in the old system (irregularities and organizational growth)
2. To seize the opportunity
3. The existence of instruction

Expected increase in system

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Definition and Explanation of Data Structures, Stack, Queue, Sorting (Bubble Sort and Selection Sort)

1. DATA STRUCTURES  
Data structures are ways to save or represent data in the computer to be used efficiently. While the data is a representation of the real world facts. Facts or information about a reality that is stored, recorded or represented in the form of text, sound, images, signals or symbols.

Broadly speaking, the types of data can be categorized into:
Simple data type. Single simple data types,

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Definition of Management

Management word comes from Old French Menagement, which means the art to implement and manage. According to Mary Parker Follett, management as art work done through others. This definition means that a manager responsible for managing and directing others to achieve organizational goals. According to Ricky W. Griffin: a process of planning, organizing, coordinating, and controlling resources to achieve the objectives (goals) effectively and efficiently. Effective means that the goal can be achieved in accordance with the planning, while efficiently means that the task at hand done correctly, organized,

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Client-Server

Client-Server is a division of labor between the server and the clients who access the server in a network. So the client-server architecture is the design of an application consists of client and server communicate with each other when accessing servers in a network.

Client server system is defined as a distributed system,

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The Functions of Computer Servers

After I provide an understanding of an existing operating system on the server computer. Now it’s time to switch to a function or usefulness of the server itself. There are several functions that can be found on this server, among others, are as follows.

Application server
This server has the function to store a wide variety of applications that will be accessed by the client computer. For example, the central

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Components of Server

Components of the server computer consist of a wide variety of hardware together with regular components in the client computer. Nevertheless, the components on the server as well as a class have a much higher quality because it will function with many compositions. The following explanation will tell you what these components are.

Motherboard
The motherboard is a circuit board inside a computer with all the components in your computer be connected. This is the core of a computer that is referred to as ‘ mother ‘.
The main components on the

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Defintion of Computer Server

Have you ever heard the term of computer server? Maybe once and not infrequently you’re wondering about the definition, usability, and its parts. Indeed, what is a server computer? It is a computer with a particular service on a network. This computer is like a parent who store and manage information, and distribute to other computers in order to be used together.

This type of computer is used either in the Internet or in an intranet network. In general, this computer will operate for 24 hours without stopping in order to provide

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Information Technology and Development of its Numerous Aspects

Info technology provides background knowledge concerning major info technology parts : hardware and software, networks and information. these days nearly all sorts of organizations are increasingly dependent on info technologies for achieving their strategic and operational objectives. in the past decade, enterprise systems are broader offer secure, electronic connection with vendors and buyers, and the net has turned out to be a mainstream channel for communications and business transactions. Being a regular user of numerous laptop and communication devices, you are most likely already cognizant of a number of the innovations in laptop systems and networks who have been introduced with tinnitus vendors in the past few years. the extremely fast technological

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The Definition of Harddisk

Hard disk is medium data storage on a computer that consists of a collection of magnetic hard disks and spinning, as well as other electronic components. Hard disks use a flat disc called the platter, which on both sides are coated with a material that is designed to be able to store information magnetically. Platter-platter by punching holes in the center are arranged and rearranged on a spindle. Platter spinning at very high speed which is controlled by the spindle motor that is

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Computer Security

Until this time, millions of people use the computers either at home, school, workplace, or even in casual places, by using a computer-based personal computer-based, network, or the Internet. Information technology and growing has many advantages in human life, yet behind it is also a lot of negative aspects of the case such as computer crime, which includes theft, fraud, extortion, and many others. For the security of computer and information systems used to be guaranteed.

EMERGENCE OF COMPUTER CRIME
Causes of Increased Computer Crime

• Business applications that use information technology and computer networks has increased
• Server decentralized and distributed system cause many to be handled by professional people.
• The transition from single-to multi-vendor vendor so it needs a lot of adjustments.
• Increased capability in the field of computer user that started

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Algorithm

In mathematics and computing, the algorithm is a set of commands to solve a problem. These commands can be translated in stages from beginning to the end. These problems can be anything, with records for every problem, there are criteria for initial conditions that must be met before running the algorithm. The algorithm will be able to always end for all initial conditions that meet the criteria, in this case different from the heuristic. Algorithms often have steps repetition (iteration) or require decisions (Boolean logic and comparison) until the task is completed.

Design and analysis of algorithms is a special branch of computer science that studies the characteristics and performance of the algorithm in solving the problem, regardless of the algorithm implementation. In this branch of the discipline learned in the abstract algorithm, regardless of the

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Computer Data Processing System

Number system is a way to represent the magnitude of a physical item. Number system uses a base number or base (base / radix) that tertenntu.

Understanding numbers:
Numbers are the physical representation of the observed data. Numbers can be represented in various forms, which are then classified in a number system, but have the same meaning.

To demonstrate a type number, typically a number that will be represented in a number of conversion followed behind with a code that describes the type of number, shape

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Sejarah sistem operasi

Sistem operasi telah berkembang selama bertahun-tahun. Pada bagian berikut kitaakan secara singkat melihat beberapa highlights. Karena sistem operasi secara historistelah erat dikaitkan dengan arsitektur komputer di mana mereka berjalan, kita akanmelihat generasi-generasi komputer untuk melihat apa yang mereka adalah sepertisistem operasi. Pemetaan ini adalah sebuah komputer yang beroperasi generasisistem kasar, tetapi itu menyediakan struktur yang ada tidak.

Komputer digital sejati pertama dirancang oleh matematikawan Inggris CharlesBabbage (1792-1871). Meskipun Babbage menghabiskan sebagian besar hidupnyadan

Fortune berusaha membangun "mesin analitis." Dia tidak pernah mendapatkannyabekerja sebagaimana mestinya karena mekanis murni, dan teknologi zamannya tidakbisa menghasilkan diperlukan roda, gigi, dan gigi presisi tinggi yang dia butuhkan.Tak perlu dikatakan, mesin analisis telah ada sistem operasi.

Generasi pertama (1945-55) Vacuum Tube dan plugboards

Setelah berhasil Babbage usaha, sedikit kemajuan dalam mengembangkan komputerdigital hingga Perang Dunia II. Di sekitar pertengahan 1940-an, Howard Aiken diHarvard, John von Neumann di Institut studi lanjutan di Princeton, J. Presper Eckertdan William Mauchley di University of Pennsylvania, dan Konrad Zuse di Jerman,antara lain, semua berhasil membangun mesin hitung. Relay mekanis pertama yangdigunakan tapi sangat lambat, dengan waktu siklus diukur dalam menit. Relay yangkemudian digantikan oleh tabung vakum. Mesin ini sangat besar, mengisi seluruhkamar dengan puluhan ribu tabung vakum, tetapi mereka masih satu juta kali lebih lambat daripada komputer pribadi termurah yang tersedia saat ini.

Di jaman ini awal, kelompok orang-orang yang dirancang, dibangun, diprogram,dioperasikan dan dikelola setiap mesin. Semua program ini dilakukan dalam bahasamesin mutlak, sering dengan kabel sampai plugboards untuk mengendalikan fungsidasar dari mesin. Bahasa pemrograman yang tidak diketahui (bahkan Majelis bahasatidak diketahui). Sistem operasi yang terdengar. Yang biasanya terbuat dari operasi iniuntuk programmer untuk mendaftar untuk blok waktu pada lembar pendaftaran didinding, dan datang ke kamar mesin, masukkan plugboard nya ke komputer, danmenghabiskan beberapa jam berikutnya berharap bahwa tak satu pun dari tabungvakum 20.000 atau akan membakar keluar selama menjalankan. Hampir semuamasalah langsung perhitungan numerik, seperti penggilingan keluar tabel sinus,cosinus, dan Logaritma.

Di awal 1950an, rutin telah meningkat sedikit dengan pengenalan kartu meninju.Sekarang mungkin untuk menulis program pada kartu dan membacanya di daripadamenggunakan plugboards; Jika tidak, prosedur adalah sama.

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