Information System

In a general sense, the term Information System (IS) refers to a system of people, data records and activities that process the data and information in an organization, and it includes the organization's manual and automated processes. In a narrow sense, the term information system (or computer-based information system) refers to the specific application software that is used to store data records in a computer system and automates some of the information-processing activities of the organization. Computer-based information systems are in the field of information technology. The discipline of business process modelling describes the business processes supported by information systems. 

There are various types of information systems, for example: transaction processing systems, decision support systems, knowledge management systems, database management systems, and office information systems. Critical to most information systems are information technologies, which are typically designed to enable humans to perform tasks for which the human brain is not well suited, such as: handling large amounts of information, performing complex calculations, and controlling many simultaneous processes.
Information technologies are a very important and malleable resource available to executives.^[1] Many companies have created a position of Chief Information Officer (CIO) that sits on the executive board with the Chief Executive Officer (CEO), Chief Financial Officer (CFO), Chief Operating Officer (COO) and Chief Technical Officer (CTO).The CTO may also serve as CIO, and vice versa. The Chief Information Security Officer (CISO), who focuses on information security within an organization, normally reports to the CIO.
In computer security, an information system is described by the following components ^[2]:

• Repositories, which hold data permanently or temporarily, such as buffers, RAM, hard disks, cache, etc. Often data stored in repositories is managed through a database management system.
• Interfaces, which support the interaction between humans and computers, such as keyboards, speakers, scanners, printers, etc.
• Channels, which connect repositories, such as routers, cables, etc.

Information technology departments in larger organizations tend to strongly influence information technology development, use, and application in the organizations, which may be a business or corporation. A serous of methodologies and processes can be used in order to develop and use an information system. Many developers have turned and used a more engineering approach such as the System Development Life cycle (SDLC) which is a systematic procedure of developing an information system through stages that occur in sequence. An Information system can be developed in house( within the organization)or outsourced. This can be accomplished by outsourcing certain components or the entire system.^[3]

• A computer based information system, following a definition of Langefors^[4], is:
  
• a technologically implemented medium for recording, storing, and disseminating linguistic expressions,
• as well as for drawing conclusions from such expressions.

which can be formulated as a generalized information systems design mathematical program

iPhone Connects to computer

Computers and iPods go hand-in-hand. You cannot use an iPod without a computer. As in most cases, where there is good compatibility, there is seldom a chance of conflict. But incase of an iPod and a system, sometimes this proves to be incorrect.

When we buy any new gadget or electronic device we take pains to make sure it is compatible with what we already have. Same with an iPod, one always ensures that the OS one has is compatible with the new iPod.

 

However in some cases, especially for amateurs, we overlook certain factors. This leads to conflicts between the devices further leading to data loss. One can use an iPod recovery software in such a dire situation.

For example, when a person buys a new iPod the first thing he/she does is connects it to the computer The computer gives you a message saying that the iPod needs to be scanned and fixed, or if you want to continue without scanning.

The computer to hang no matter which option you choose. You then realise that all the music and other data from your iPod is deleted.

 

Cause:

The USB cable you are using is not compatible with the computer. The iPod may not be have some sort of a virus/malware which transferred to the computer. The iTunes being used may not be compatible with the OS. Or it may be too heavy an application, thus making the system slow.

Whichever be the case, if the iPod data gets erased, it's because it was not ejected properly.

 

Solution:

Although viruses and bugs in an iPod are rare, it's not impossible to have one. They get downloaded with the music from unsafe sites. More often than not, they are harmless to the iPod but pose great threat to the system.

If the USB cable is the problem, all one has to do is get a new USB 2.0 adapter and ensure it is configured to the computer.

 

Whichever be the case, if the computer has hung, you can retrieve lost data using either a backup or any of the numerous data recovery softwares available. When a computer crashes while an iPod is still connected to it, the later too invariably loses data. This data too can be recovered using an iPod Recovery Software. Connect the iPod to the computer, install the software-thats all it takes!! It then scans the iPod, and recovers all iPod data.

 

Stellar Phoenix iPod Recovery, an extremely user friendly software, enables us to recover data not only quickly but also efficiently. This software supports MIDI, AVI, MOV, MP3, MP4 etc formats enabling it to recover all iPod data.

iPod Connects To Computer   by Simpson

Kimi Ni Todoke

 

Anime Kimi ni Todoke ^^

Come On! さんはこのブログで私と一緒にこのアニメを共有しましょう！

http://www.ichadan.blogspot.com

*promosi :D

Local Area Network (LAN)

LAN adalah kumpulan dari komputer, printer dan perangkat-perangkat lain yang saling berhubungan.

Karakteristik LAN :

Keterbatasan area/geografi operasi

Transfer data kecepatan tinggi.

Koneksi terus-menerus ke servis lokal

Umumnya lebih murah dari jaringan WAN

Kable adalah media transmisi utama.

Desain LAN

Duah persoalan utama dalam mendesain dan mengimplementasikan LAN adalah :

1. Jarak

2. Biaya

Jarak

Local Area Network (LAN) dibatasi oleh jarak. Penyebab utamanya adalah keterbatasan media transmisi. Kabel yang membawa trafik data akan mengalami redaman sehingga tidak mampu membawa trafik data pada jarak yang sangat jauh. Untuk jarak tertentu dapat digunakan repeater/penguat sinyal sepanjang jalur transmisi.

Anda dapat bayangkan jika jaringan anda di Jakarta ingin terhubung dengan jaringan anda diSurabaya. Hal ini tidak memungkinkan jika anda menggunakan repeater/penguat sinyal sepanjang lintasan, karena akan sangat terlalu mahal. Solusi untuk menghubungkan antara LAN anda di Jakarta dengan LAN anda di Surabaya adalah dengan menggunakan WAN.

Visual Basic

Konsep Dasar Bahasa Pemograman Visual Basic 6.0

Sejarah Visual Basic

 

Visual Basic pada dasarnya adalah sebuah bahasa pemrograman komputer, yang didalamnya terdapat perintah-perintah atau instruksi-instruksi yang dimengerti oleh komputer untuk melakukan tugas-tugas tertentu.

Visual Basic (yang disingkat dengan VB) selain disebut sebagai bahasa pemograman, juga sering disebut sebagai sarana (tool) untuk menghasilkan program-program aplikasi berbasiskan windows. Beberapa kemampuan atau manfaat dari Visual Basic diantaranya adalah:

1. Untuk membuat program aplikasi berbasis Windows.

Untuk membuat objek-objek pembantu seperti misalnya Control ActiveX, File Help, aplikasi internet dan lain sebagainya.

2. Menguji program (debugging) dan menghasilkan program akhir berakhiran exe yang bersifat executable atau dapat langsung dijalankan.

Stuktur Program Visual Basic

Dalam membuat program, aspek utama yang harus diketahui oleh pemograman adalah struktur program. Programa akan berjalan baik, jika mempunyai struktur program yang benar. Begitu pula dengan membuat program dengan Visual Basic. Pemograman harus mengetahui struktur program yang berlaku pada Visual Basic.

Agar dapat merancang sebuah program dengan baik dan terarah, sebaiknya harus mengenal terlebih dahulu struktur program dalam Visual Basic.

Secara umum struktur program Visual Basic terdiri dari dua bagian, yaitu bagian deklarasi program dan bagian pernyataan program.

1. Bagian deklarasi Program

Bagian ini merupakan bagian peletakan semua deklarasi data yang akan digunakan. Secara umum kata cadangan yang merupakan bagian dari deklarasi adalah: Dim, Private, Const, dan type.

 

a. Deklarasi Dim atau Dimension.

Dim atau Dimension adalah kata cadangan yang sering dipakai mendeklarasikan Variabel yang akan digunakan dalam visual Basic. Pendeklarasian dengan pernyataan Dim berlaku pada pemograman modul, program dan sub-program.

 

b. Deklarasi Publik

Publik merupakan pernyataan yang menggantikan pernyataan global dalan Visual Basic. Pernyataan Publik menyatakan bahwa semua variabel yang dideklarasikan oleh pernyataan berlaku secara umum. Publik merupakan pernyataan level modul, artnya pernyataan ini pada dasarnya dideklarasikan pada semua modul.

 

c. Deklarasi Private

Private menyatakan bahwa semua variabel yang dideklarasikan oleh pernyataan berlaku secara khusus (private). Pernyataan private merupakan pernyataan level sub-program, artinya pernyataan yang pada dasarnya dideklarasikan pada sebuah sub-program.

 

d. Deklarasi Statis

Static sering digunakan untuk suatu variabel atau nilai agar tepat atau tidak berubah, selama program dijalankan. Pernyataan statik merupakan pernyataan level sub-program, artinya pernyatan yang pada dasarnya dideklarasikan pada bagaia sub-program.

 

e. Deklarasi Const atau Constanta

Const atau constanta sering dipakai pada bagian deklarasi untuk memberikan harga konstan pada suatu variabel. Const merupakan pernyataan level modul, artinya pernyataan yang pada dasarnya dideklarasikan pada modul. Dalam prakteknya pernyataan const sering dipandu dengan pernyataan publik atau private.

 

f. Deklarasi Type

Type dipakai bada bagian deklarasi untuk mendefenisiskan type data terdefenisi. Dimana type data ini dapat mengandung satu atau lebih dari suatu type data.

Type merupakan pernyataan level modul, artinya pernyataan yang pada dasarnya dideklarasikan pada modul. Dalam prakteknya pernyataan type sering dipandu dengan pernyataan public atau private.

2.  

Ba

 BAGIAN PERNYATAAN PROGRAM

Windows 7

Originally, a version of Windows codenamed Blackcomb was planned as the successor to Windows XP (codename Whistler) and Windows Server 2003. Major features were planned for Blackcomb, including an emphasis on searching and querying data and an advanced storage system named WinFS to enable such scenarios. However, an interim, minor release, codenamed "Longhorn," was announced for 2003, delaying the development of Blackcomb. By the middle of 2003, however, Longhorn had acquired some of the features originally intended for Blackcomb. After three major viruses exploited flaws in Windows operating systems within a short time period in 2003, Microsoft changed its development priorities, putting some of Longhorn's major development work on hold while developing new service packs for Windows XP and Windows Server 2003. Development of Longhorn (Windows Vista) was also restarted, and thus delayed, in August 2004. A number of features were cut from Longhorn.

 

Blackcomb was renamed Vienna in early 2006 and again Windows 7 in 2007. In 2008, it was announced that Windows 7 would also be the official name of the operating system. There has been some confusion over naming the product Windows 7,while versioning it as 6.1 to indicate its similar build to Vista and increase compatibility with applications that only check major version numbers, similar to Windows 2000 and Windows XP both having 5.x version numbers.

 

The first external release to select Microsoft partners came in January 2008 with Milestone 1, build 6519. At PDC 2008, Microsoft demonstrated Windows 7 with its reworked taskbar. Copies of Windows 7 build 6801 were distributed at the end of the conference; however, the demonstrated taskbar was disabled in this build.

On December 27, 2008, Windows 7 Beta was leaked onto the Internet via BitTorrent. According to a performance test by ZDNet, Windows 7 Beta beat both Windows XP and Vista in several key areas; including boot and shutdown time and working with files, such as loading documents. Other areas did not beat XP; including PC Pro benchmarks for typical office activities and video editing, which remain identical to Vista and slower than XP.On January 7, 2009, the 64-bit version of the Windows 7 Beta (build 7000) was leaked onto the web, with some torrents being infected with a trojan. At CES 2009, Microsoft CEO Steve Ballmer announced the Windows 7 Beta, build 7000, had been made available for download to MSDN and TechNet subscribers in the format of an ISO image. The Beta was to be publicly released January 9, 2009, and Microsoft initially planned for the download to be made available to 2.5 million people on this date. However, access to the downloads was delayed because of high traffic. The download limit was also extended, initially until January 24, then again to February 10. 

People who did not complete downloading the beta had two extra days to complete the download. After February 12, unfinished downloads became unable to complete. Users could still obtain product keys from Microsoft to activate their copies of Windows 7 Beta, which expired on August 1, 2009. The release candidate, build 7100, has been available for MSDN and TechNet subscribers and Connect Program participants since April 30 and became available to the general public on May 5, 2009. It has also been leaked onto the Internet via BitTorrent. The release candidate is available in five languages and will expire on June 1, 2010, with shutdowns every two hours starting March 1, 2010. Microsoft stated that Windows 7 would be released to the general public on October 22, 2009. Microsoft released Windows 7 to MSDN and Technet subscribers on August 6, 2009, at 10:00 a.m. PDT. Microsoft announced that Windows 7, along with Windows Server 2008 R2, was released to manufacturing on July 22, 2009. Windows 7 RTM is build 7600.16385, which was compiled on July 13, 2009, and was declared the final RTM build after passing all Microsoft's tests internally. "The launch of Windows 7 has superseded everyone’s expectations, storming ahead of Harry Potter and the Deathly Hallows as the biggest-grossing pre-order product of all-time, and demand is still going strong," claimed managing director Brian McBride, Amazon UK on October 22."

Wired LAN vs Wirless LAN

Wired LAN vs Wireless LAN

Local area network (jaringan komputer lokal) memungkinkan terjadinya pertukaran data dan informasi melalui komputer, dengan menyediakan koneksi yang cepat dan andal. Jaringan komputer konvesional menggunakan media transmisi kabel, coaxial, twisted pair ataupun fiber optic untuk memenuhi kebutuhan tersebut. Pengkabelan ini selain hardware dan software, juga merupakan bagian yang besar dari biaya investasi instalasi sebuah jaringan komputer. Untuk jaringan yang ada pada kantor kantor besar, biaya pengkabelan ini dapat mencapai lebih dari 40% dari biaya total yang dibutuhkan. Masalah akan timbul apabila jaringan akan di konfigurasi ulang atau untuk kantor sementara seperti kantor konsultan. Untuk kasus pengkonfigurasian ulang jaringan, akan dibutuhkan biaya yang hampir sama dengan biaya instalasi LAN baru. Sedangkan pengkabelan LAN untuk kantor yang semantara hanya akan menghabiskan waktu dan uang.

Masalah ini ikut memacu dikembangkannya wireless LAN, mengingat karakteristik sistem wireless yang fleksibel untuk diimplementasikan dimana saja seperti perkantoran, industri, rumah sakit maupun perguruan tinggi. Disamping itu sistem wireless juga menawarkan berbagai aplikasi diantaranya aplikasi komunikasi antar terminal PC dan koneksi ke jaringan telepon misalnya wireless PABX. Dengan pertimbangan tersebut, wireless LAN dapat memberikan biaya instalasi yang lebih ekonomis, disamping sifatnya yang portabel.

Dalam mengimplementasikan indoor wireless LAN digunakan arsitektur seluler dimana gedung akan dibagi dalam beberapa cell dan setiap cell akan memiliki link wireless. Area cakupan wireless tergantung dari beberapa faktor seperti teknologi yang digunakan, lingkungan pengimplementasian, kecepatan data dll.

· Teknologi

Pada prinsipnya pembangunan link wireless pada implementasi wireless LAN tidak hanya dapat dilakukan dengan teknologi frekuensi radio (RF) tetapi juga dapat menggunakan teknologi infra merah. Tetapi pada saat ini teknologi RF lebih banyak dikembangkan untuk kebutuhan sistem wireless. Teknologi RF sendiri terbagi dalam beberapa teknik akses, salah satu diantaranya yaitu teknik Multiple Akses yang paling sering digunakan para vendor sebagai teknik akses produk wireless mereka, yaitu teknik multiple access FDMA, TDMA dan CDMA.