Senin, 04 Desember 2017

Security of a System

On 09.55 by relxs in Security of a System No comments

The security of a network is very important to keep private data private. But what happens when we can not secure our network or network security system is too weak so it is very easy to be infiltrated by people who are not responsible. Therefore we must create a strong and difficult security system, using the technology at the moment we can tell it to be real. The most important thing we should do is "do not be careless".

Before securing the network we will recognize the crime of security intrusions and other kinds of network security:

1. Types of Network Security Disorders

§ Carding, ie data theft against one's banking identity. examples of credit card number thefts are used for online shopping.

§ Sniffer, Equipment that can monitor the process of data being

Takes place.

§ Phreaking, Behavior makes the phone security system weakened.

§ Physing, which is a forgery of official data.

§ Deface, ie changes to the shape or appearance of the website.

§ Hacking, ie destruction of existing computer network infrastructure.

many types of network security impediments that are applied by irresponsible people but just be quiet buddy, there are many kinds of network security tiger and network security tips that can be applied in our network security system.

2. Types of Network Security

§ Authentication is the process of introducing equipment, operating system, application and user identity connected to a computer network. for example the user enter the username and password at login to the network.

§ Encryption (data confidentiality) is a data coding technique that can be useful for maintaining data.

§ VPN (Virtual Private Network) is a local communication network that can connect through network media. function of a separate VPN to obtain secure communications over the internet.

§ DMZ (De-Militerized Zone) serves to protect the internal system from hacker attacks.

PURPOSE :

The purpose of this proposal are:

• Secure the data

• Create system security

• It complicates password logging

• Use an antivirus application

• Avoiding dangerous networks

• Updating operating system

Network Security Tips :

§ Use an AntiVirus that suits our needs to prevent a variety of computer viruses.

§ Using Password is very difficult to guess.

§ Update Computer, do not just update the anti virus it would be nice we also must update the software installed on our computer for computer security.

§ Do any Browsing habits of people usually visit pirated sites like mp3, pirated mp4. whereas there are pathogen viruses that can spread to our computer.

§ Make layers in layers.

§ Using UNIX / LINUX based operating system.

According to my research many systems are very fragile so easily broken through, so I think to be able to create a strong system. To create a strong security system we have to create a layer of security. Example: a class has 5 treasurers with the exact same book record, if one of the treasurers cheats he will get caught, because the change in the note in the other treasurer's book is not exactly the same.
We create multiple servers scattered in a particular country, and store data on that server, when someone tries to damage the server then automatically destroys itself and keeps your data secure, as your data is moved to another server.

When we have secured a network, do not forget to always be vigilant, because the bully will try to damage our network. Things we must consider in the Threat of Computer Networks are:

• In PHYSICAL form

§ Computer hardware theft or

§ network devices

§ Damage to computers and network communication devices

§ Wiretapping

§ Natural disasters

• In LOGIC form

§ Damage to the operating system or application

§ Viruses

§ Sniffing

Increasingly the development of technology in the world, so that will increase the destruction of the system for personal gain. So we choose which security we apply, to prevent intruders from damaging the computer network security system, use security as required by our network.

BIBLIOGRAPHY :

https://microcyber2.com/sistem-keamanan-jaringan-komputer/

https://citrabagus.wordpress.com/keamanan-jaringan-komputer/

Data Warehouse

On 01.21 by relxs No comments

Data Warehouse And Discussion

1. Understanding Data Warehouse

According to Innon 2002, h.31-35, Data warehouse is a subject-oriented, integrated, non-updatable, time-dimensional data collection used to support management processes in business decisions and intelligence.

2. Data Warehouse Characteristics

There are 4 characteristics of data warehouse that is:
a. Subject-oriented
Data-oriented warehouse means data warehouse is designed to analyze data based on certain subjects in the organization, not on a particular application process or function
Integrated
Data Warehouse can store data from source- separate sources into a format that is consistent and integrated with each other so that the data can not be broken because the existing data is a unity that supports the whole concept of data warehouse itself
c Time Range (Time Variant)
All data in the data warehouse can be said to be accurate or valid within a certain time range. Data does not provide the current status, they are stored for five or ten years or more and are used for trends, forecasting and comparison. d.
Nonvolatile
means data in the data warehouse is not updated in real time but is refreshed from the operational system on a regular basis. New data is always added as a supplement to the database itself rather than as a change. The database continuously absorbs this new data, then incrementally merges with the previous data.

3. Advantages of Data Warehouse

Building a data warehouse certainly provides more benefits for a company, as data warehouses can provide a strategic advantage to the company beyond their competitors. Benefits are derived from several sources (Sean Nolan, Tom Huguelet):
1. Ability to access large data
2. Ability to have consistent data
3. Fast performance analysis capabilities
4. Recognize repeated results
5. Find gaps in business knowledge or business process.
6. Reduce administrative costs
7. Giving authority to all members of the company by providing them with the information needed for performance to be more effective.

4. Destination Data Warehouse

1. Facilitate accessing company information
2. Providing company information consistently
3. Be able to adapt and withstand changes
4. Capable of securing Company information
5. Able to provide support in decision making
6. Can be accepted and operated well by the user

5. Data Mechanism In Data Warehouse

Data warehouse has four levels of data (kimball, 2004), namely:
1. Level Operational
Level is specialized in storing application-oriented data in detail and prioritized to meet operational needs. Access at the operational level generally has a very high frequency. This level is often also referred to as OLTP (Online Analytical Transactional Processing)
2. Level Integration
This level stores the historical data are integrated and subject-oriented. Data at this level is simpler than the operational level and can not be updated.
3. Data level mart
This level is designed according to the needs of the user and is the data aggregation.
4. Individual Level
This level is where the analysis and reporting takes place. Data at this level are temporal, ad hoc, heuristic, and non-retitive.

6. Process In Data Warehouse

Some of the processes that occur from the operational database to the data warehouse are as follows (corey, et al, 2001):
1. Conducting data extraction from various sources
2. Conducting data integration into a common place
3. Storing data in a format that can be used by the user
4. Provide mechanism for users to access data warehouse.

7. Data Mart

Bill Inmon et al specify the data mart is a subset of the data warehouse that has been adjusted to fit the needs of the department.

8. Metadata

Metadata is about the data set that already exists in the data warehouse program and operational data.

9. ETL (Extraction Transformation Loading)

ETL is one of the processes in the data warehouse that involves reading data from the source, cleaning and adjusting the data format, writing the data into storage space for further use. (Songini, 2004).

10. Online Analythical Processing (OLAP)

The first OLAP concept was proposed by EF Codd, to represent a multidimensional data model. OLAP (Online Analytical Processing) is a technology that processes data in a data warehouse in a multidimensional structure, providing quick answers to complex query analysis The
objective of OLAP is to coordinate large amounts of data, in order to be quickly analyzed and evaluated using means online such as Microsoft PivotTable as well as graphical representation. The OLAP system provides the speed and flexibility to support real-time analysis.
Data warehouses and OLAP (Online analytical Processing) provide the key to solving complex problems, as they are generally capable of providing consolidated and consistent, topic-oriented, historical and read-only data.

11. Cube

Cube is a major part of OLAP. Cube contains a large collection of data that has been put together (in aggregation) thus speeding up the query results. For example, sales data that has been combined with time period data and type of goods, will speed up the query results to display sales data per week, or per month and based on certain types of goods. (Webb, et al., 2009)

12. Data Warehouse Development

According to Kimball there are nine stages done to develop data warehouse database, among others:
1. Selection process
2. Selection of sources
3. Identify dimensions
4. Selection of facts
5. Saving pre-calculation in the fact table
6. Completing the dimension table
7. Selection duration table data
8. Tracing dimensional changes
9. Specify priority and query mode

13. Data Warehouse Design

There are 2 approaches in creating data warehouse:
1. Star Scheme (Star Schema)
Following star shape. The star scheme consists of a fact table centered on a star with several dimensional tables (dimensional tables) surrounding it. All dimension tables are directly linked to the fact table.

2. Snowball Scheme The
snowball scheme is an extension of the star scheme with the addition of several dimension tables that are not directly connected to the fact table, but through other dimension tables.

Source : http://m-zulkifli.blogspot.co.id/2014/12/data-warehouse-dan-pembahasannya.html

Logo Blender

On 08.43 by relxs No comments

Review

Ini adalah contoh logo aplikasi blender yang saya buat menggunakan Aplikasi blender tsb.

Download Via Solidfiles

Mengenal Software Blender

On 20.32 by relxs 1 comment

Logo Blender (source: google.com)

Blender adalah program 3D dan animasi yang bersifat opensource, bebas untuk dikembangkan oleh penggunanya dan dapat didistribusikan kembali dan bersifat Legal. Blender memiliki video compositor dan intergrated game engine Karya yang dihasilkan tidak ada sifat royalt kepada developer, dan dapat dipublikasikan baik free maupun untuk dikomersilkan.

Blender merupakan salah satu program Modeling 3D dan Animation, tapi Blender mempunyai kelebihan sendiri dibandingkan program modeling 3D lainnya. Kelebihan yang dimiliki Blender adalah dapat membuat game tanpa menggunakan program tambahan lainnya, Karena Blender sudah memiliki Game Engine sendiri dan menggunakan Python sebagai bahasa pemograman yang lebih mudah ketimbang menggunakan C++,C, dll.

Blender menggunakan OpenGL sebagai render grafiknya yang dapat digunakan pada berbagai macam sistem operasi seperti Windows, Linux dan Mac OS X. Saat ini Blender sudah mengeluarkan versi yang terbarunya, yaitu Versi 2.49 yang lebih ditujukan untuk pembuat game. Karena Versi ini memiliki fitur-fitur baru yang dirancang untuk membuat tampilan game yang lebih realistis dari pada versi sebelumnya.

MRT (source: google.com)

objek atau animasi yang saya buat adalah mengenai alat transportasi. alat transportasi yang dimaksud adalah kereta berjenis MRT.sedangkan acuan saya sebagai referensi adalah 1a1b1c1 . sebuah blog mahasiswa gunadarma yang menyediakan tutorial blender.

Fungsi Fitur-fitur Blender
Secara default atau saat membuka aplikasi Blender, tampilan awal Blender yang akan muncul adalah seperti berikut.

Klik kiri pada sembarang tempat untuk menampilkan factory settings pada Blender, sehingga akan tampil fitur seperti berikut.

Header : Menu utama Blender yang terdiri atas File, Add, Render, dan Help.
Viewport : Tampilan yang terdiri dari objek 3D atas objek lainnya.
Toolbar : Terdiri atas daftar tools yang memilikisifat dinamis menurut objeknya.
Outliner : Struktur data dari objek pada Blender.
Properties : Panel yang memuat berbagai macam perintah untuk memodiﬁkasi objek atau animasi dan bersifat dinamis mengikuti objek atau tools yang sedang aktif.
Timeline : Instruksi yang terkait dengan frame animasi atau untuk sequencer.

a. Screen Layouts

Saat membuka Blender, layar akan menampilkan secara default seperti pada gambar di atas. Tampilan tersebut dapat diganti sesuai kebutuhan, misalnya kebutuhan untuk merancang simulasi visual, Anda dapat memilih layout animation yang merupakan tampilan untuk mengerjakan animasi dan lain-lain. Tools ini berada pada pojok kiri atas layar, merupakan bagian dari Main Header yaitu menubar yang ada di bagian atas pada tampilan Blender.

b. Splitting Windows

Splitting windows atau pembagi tampilan lembar kerja pada software Blender, Splitting windows dalam pembuatan simulasi visual 3D seringkali digunakan. Contohnya dalam pemodelan 3D diperlukan lebih dari 1 windows. Splitting windows adalah membagi menjadi 2 windows dalam tipe yang sama dan dapat dilakukan secara horizontal maupun vertical. Berikut cara melakukan splitting windows.

Arahkan kursor pada sudut windows yang dilingkari merah, maka kursor akan berubah menjadi (+) tanda plus. Kemudian klik tombol kiri mouse, tahan dan geser seperti gambar di atas.

Note : ”Untuk melakukan splitting windows secara vertical, sama seperti splitting windows secara horizontal, namun pada hasil splitting windows secara vertical akan mendapatkan 2 windows atas dan bawah.”

Changing the Editor Type

Ada beberapa jenis “editor” yang secara default tidak ditampilkan oleh Blender, Anda dapat mengganti dengan jenis “editor” lain. Sesuai dengan kebutuhan Anda.

c. Shortcut of Numpad

Bagi para pengguna laptop disarankan untuk mengaktifkan Emulate Numpad, karena berguna untuk menggantikan tombol Numpad, sehingga bisa menggunakan perintah Numpad dengan menekan tombol angka pada keyboard bagian atas. Untuk mengaktifkan Emulate Numpad, bisa langsung menuju File -> User Preferences kemudian ikuti langkah seperti pada gambar di bawah ini.

Berikut ini adalah fungsi angka-angka pada numpad sebagai shortcut :

[1] Tampak Depan
[3] Tampak Kanan
[7] Tampak Atas
[2] Putar bawah 15 derajat
[8] Putar atas 15 derajat
[4] Putar Kiri “15derajat”
[6] Putar Kanan “15derajat”
[5] Orthographic atau Perspektif
[0] Camera Perspektif
[CTRL][2] Menggeser View Objek Ke atas
[CTRL][8] Menggeser View Objek Kebawah
[CTRL][4] Menggeser Objek Kesamping Kanan
[CTRL][6] Menggeser objek kesamping kiri

d. Snap 3D Cursor

Pada dasarnya 3D Cursor digunakan untuk menentukan letak objek, sedangkan Snap merupakan sebuah alat bantu dalam menemukan titik acuan. Cara melakukan snap 3D cursor adalah dengan menekan SHIFT +S.

Selain itu, Snap juga bisa digunakan saat mentransformasi objek dengan cara menekan CTRLsambil merubah objek, sehingga objek akan bertranformasi dengan skala tertentu.

e. Adding Object
Adding Object merupakan sebuah menu untuk menambahkan objek pada bidang 3D. Lakukan dengan cara menekan SHIFT +A atau pilih menu Add pada Header menu.

Dalam menambah objek pada Blender akan menemukan dua jenis mode, yaitu

Object Mode dan Edit Mode.

Kedua mode tersebut memiliki fungsi yang berbeda. Edit Mode digunakan untuk melakukan pengeditan pada objek dengan memilih titik tertentu, sedangkan Object Mode digunakan untuk pengeditan objek secara keseluruhan. Untuk memilih modus Object Mode atau Edit mode, dapat menekan tombol Tab pada keyboard. Tampilan kedua Mode tersebut seperti pada gambar di bawah ini.

f. Transformation
Transformation adalah upaya untuk menggeser atau memutar atau mengubah ukuran objek.
Dasar transformasi dalam Blender, meliputi:

Grab / Move : menggeser objek dengan menekan tombol [G]
Rotation : memutar objek dengan menekan tombol [R]
Scale : menskala (memperbesar atau memperkecil) objek dengan menekan tombol [S]

Untuk mentransformasikan objek berdasarkan sumbu ( x, y, z ), Anda dapat menggunakan shortcut keyboard,
Grab / Move [G]

[G]+[X] : objek akan bergeser pada sumbu X.
[G]+[Y] : objek akan bergeser pada sumbu Y.
[G]+[Z] : objek akan bergeser pada sumbu Z.
[G]+[Shift ]+[X] : objek akan bergeser pada sumbu Y dan Z karena sumbu X telah dikunci agar tidak berubah.