Android (sistem operasi)

Android adalah sistem operasi untuk telepon seluler yang berbasis Linux. Android menyediakan platform terbuka bagi para pengembang buat menciptakan aplikasi mereka sendiri untuk digunakan oleh bermacam peranti bergerak. Awalnya, Google Inc. membeli Android Inc., pendatang baru yang membuat peranti lunak untuk ponsel. Kemudian untuk mengembangkan Android, dibentuklah Open Handset Alliance, konsorsium dari 34 perusahaan peranti keras, peranti lunak, dan telekomunikasi, termasuk Google, HTC, Intel, Motorola, Qualcomm, T-Mobile, dan Nvidia.

Pada saat perilisan perdana Android, 5 November 2007, Android bersama Open Handset Alliance menyatakan mendukung pengembangan standar terbuka pada perangkat seluler. Di lain pihak, Google merilis kode–kode Android di bawah lisensi Apache, sebuah lisensi perangkat lunak dan standar terbuka perangkat seluler.

Di dunia ini terdapat dua jenis distributor sistem operasi Android. Pertama yang mendapat dukungan penuh dari Google atau Google Mail Services (GMS) dan kedua adalah yang benar–benar bebas distribusinya tanpa dukungan langsung Google atau dikenal sebagai Open Handset Distribution (OHD).

Fitur

Fitur yang tersedia di Android adalah:

• Kerangka aplikasi: itu memungkinkan penggunaan dan penghapusan komponen yang tersedia.
• Dalvik mesin virtual: mesin virtual dioptimalkan untuk perangkat mobile.
• Grafik: grafik di 2D dan grafis 3D berdasarkan pustaka OpenGL.
• SQLite: untuk penyimpanan data.
• Mendukung media: audio, video, dan berbagai format gambar (MPEG4, H.264, MP3,

AAC, AMR, JPG, PNG, GIF)

• GSM, Bluetooth, EDGE, 3G, dan WiFi (hardware dependent)
• Kamera, Global Positioning System (GPS), kompas, dan accelerometer (tergantung hardware)

Android bagi komunitas sumber terbuka (open source)

Android memiliki berbagai keunggulan sebagai software yang memakai basis kode komputer yang bisa didistribusikan secara terbuka (open source) sehingga pengguna bisa membuat aplikasi baru di dalamnya. Android memiliki aplikasi native Google yang terintegrasi seperti pushmail Gmail, Google Maps, dan Google Calendar.

Para penggemar open source kemudian membangun komunitas yang membangun dan berbagi Android berbasis firmware dengan sejumlah penyesuaian dan fitur-fitur tambahan, seperti FLAC lossless audio dan kemampuan untuk menyimpan download aplikasi pada microSD card. Mereka sering memperbaharui paket-paket firmware dan menggabungkan elemen-elemen fungsi Android yang belum resmi diluncurkan dalam suatu carrier-sanction firmware.

sumber : http://id.wikipedia.org/wiki/Android_%28sistem_operasi%29

networking system

Definition  computer network :

• A group of hardware such as PC, printers, and other equipment connected to each other and each interaction communication.

(network configuration) 

What is client server ?

Clientserver describes the relationship between two computer programs in which one program,the server, which fulfills the request .

 

There are some advantages and disadvantages of Client/Server Networks

Advantages :

•A client server can be scaled up to many services that can also be used by multiple users

•All data is stored on the servers, which generally have far greater security controls than most  clients.

•The security is a lot more advanced than a peer to peer network

Disadvantages :

•When the servers goes down or crashes . All the computers connected to it become unavailabe to use

•More expensive than a peer to peer network.You have to pay for start up cost

What is peer-to-peer ?

•  Peer-to-peer (P2P) is a distributed application architecture that partitions tasks or workloads between peers.

There are some advantages and disadvantages of Peer-to-Peer networks

Advantages :

•Peer to peer networks are easy and simple to set up and only require a Hub or a switch to connect all the computers together.

•You can access any file on the computer as long as it is set to shared folder

•This is rather cheap than having server

•If one computer fails to work all the other computers connected to it contiune to work

Disadvantages :

•If you have connected the computers together properly then therre can be problems accessing certain files

•Security is not good and you can set passwords for files that you don’t want people to access but apart from that the security is pretty poor.

 

•Sumber dan referensi : http://en.m.wikipedia.org/wiki/Peer-to-peer

•http://id.m.wikipedia.org/wiki/Klien-server

•http://en.m.wikipedia.org/wiki/Client-server_model

•http://searchnetworking.techtarget.com/definition/client-server

• Bapak Zahid

Contact >>>  YM : zahidhdr / FB : zahidhdr

Email : zahidhdr@ymail.com

my vacation

I’ll share my vacation on the holiday several days ago :D

On  31th augusts 2011 , I and my big family went to alun alun blitar to attend sholat ied . There were so crowded , and after that many people flew a lot of baloon .

 the baloon

  

Then we did a ‘sungkeman tradition'  :  

 After mellow situation , then we decided to go to the jalasutra beach . I just could said ‘Subhanallah, what a beautiful view!’,beside the beach was many high hills and there were so clean , no one trash in sight.

picture of jalasutra beach