Web Application Development

In computing, a web application is a client-server computer program in which the client (including the user interface and client-side logic) runs in a web browser. Common web apps include webmail, online retail sales, online auctions, instant messaging services and many other functions. The general distinction between a dynamic web page of any kind and a web application is unclear. Web sites most likely to be referred to as web applications are those which have similar functionality to a desktop software application, or to a mobile app. Single page application are more application- like because they reject the more typical web paradigm of moving between distinct pages with different URLs.

Technologies

There are two main categories of coding, scripting and programming for creating Web Applications:

I. Client Side Scripting / Coding – Client Side Scripting is the type of code that is executed or interpreted by browsers.

Client Side Scripting is generally viewable by any visitor to a site (from the view menu click on “View Source” to view the source code).

Below are some common Client Side Scripting technologies:

1) HTML (Hypertext Markup Language)

2) CSS (Cascading Style Sheets)

3) JavaScript

4) Ajax (Asynchronous JavaScript and XML)

5) jQuery (JavaScript Framework Library – commonly used in Ajax development)

6) Moo Tools (JavaScript Framework Library – commonly used in Ajax

7) Dojo Tool-kit (JavaScript Framework Library – commonly used in Ajax development)

II. Server Side Scripting / Coding – Server Side Scripting is the type of code that is executed or interpreted by the web server.

Server Side Scripting is not viewable or accessible by any visitor or general public.

Below are the common Server Side Scripting technologies:

1) PHP (very common Server – Linux / Unix based Open

Source – free redistribution, usually combines with MySQL database)

2) Zend Framework (PHP’s Object Oriented Web Application Framework) ASP (Microsoft Web Server (IIS) Scripting language)

3) ASP.NET (Microsoft’s Web Application Framework – successor of ASP) Ruby on Rails (Ruby programming’s Web Application Framework – free redistribution)

4) Perl

5) Python

Advantages of web application development:

1) Web apps are developed with programming languages such as HTML and CSS, which are well known among IT professionals.

2) These apps run on the device’s own web browser through a simple URL.

3) They may also open websites. This means that they don’t require to be updated in the way common apps do. In this sense, it’s the website to which the application is linked that will be updated.

4) On the other hand, a web app’s development time is lower. Hence its lower price.

Disadvantages of web application development:

1) An Internet connection will be an absolute must to run it. Otherwise, you will not be able to browse the website and the web app will be of no use to you.

2) It will also lose visibility as it will not be on display in the stores.

3) In addition, there will be some access restrictions as to certain hardware features of …

Getting Started With User Experience Crafting for Websites

Okay, this is a tough topic, because it involves really hard problems and really easy problems, however I'm not here to tell you how tough it is, I'm here to give you an easy introduction to crafting user experiences.

So, first off, what do we mean by crafting user experiences? Put simply it's what users remember when they visit or use your site. It could be 'man, that site was the coolest' or 'oh, this is so buggy'.

Now, the first order of business is figuring out what you want your users to feel?

Do you want them to leave your site feeling happy? Excited? Efficient? Smart?

Second thing, who are your users? Give an age-span together with professional background. Do you know anyone like that? Excellent, go ask them when it where the last time they felt what you want your website to make them feel.

I assume that you already have a site, now take a look at that. No, really, exit this page, look at yours and return to this. Now.

First order of business, grab all the low hanging fruit. Read through all the popular material that's older than a week and look for obvious spelling-mistakes and sentences that sound strange. Remember, text is the gold standard for communication on the internet at the moment (video is quickly gaining ground though). Also check to see if your articles are up to date, it's usually better to cut than keep something that's stale.

Check to see if its easy to read and pay especial attention to contrast and fonts. Also try to increase the text-size and Google translate it to another language. If it's readable after that you have avoided the worst hurdles.

Also check to see that both images and links have alt-texts (texts that show up when you hover your mouse over them, among other things). Try to keep this text descriptive since it will be read by people with sight-disabilities and when your images stops working.

Last thing to look for is to consider button-sizes and the like. Beginning computer learners tend to use the mouse a lot and buttons and menu's should be an OK size for them.

Now, return to your friends words on what makes them feel what you want them to feel and try to incorporate that into the page. This is where it gets very, very complicated very quickly, but remember, as long as the site is clear, informative and generally works, then you can not go to wrong. …

The Working Principles Behind a Barcode Scanner

There are many types of barcode scanners available on the market as of now, and some of them are really impressive. For example, the laser scanner is a very interesting piece of equipment once you understand the principle behind it. One of the most famous alternative to laser scanners are CCD based scanners.

CCD scanners are a different kind of scanners as they don’t have any moving parts thus they’re more reliable and less prone to failure. Another type of scanner is the 2d barcode scanner which is the most popular type of scanner. You’ll see it in almost any shop, may it be a clothing shop, a hypermarket or just your regular corner street shop.

Laser scanners use moving mirrors and light diodes and are more likely to fail in a shorter amount of time, whereas CCD barcode scanners use LEDs that are known to last 10 times more than light diodes. 2d barcode scanners also make use of the CCD technology to function.

The principle behind the CCD technology isn’t in any way mind blowing – a CCD scanner uses an array of small light sensors that are pointed at the barcode section on a product. The way these scanners work is that they form a sort of grid of tiny laser like lights on the surface of the barcode part of the product. Because barcodes are usually printed on white backgrounds a part of that light emitted from the scanner is reflected to a receiver inside the head of the scanner. That light is translated into a voltage using a photovoltaic cell, and that amount of voltage corresponds to a single type of product in the store.

After the information is sent from the scanner to the computer it’s then cross referenced to a database – which is also stored on the computer – to which the scanner is connected to. All this stuff happens in a matter of nanoseconds – the reader emits a grid of laser like lights on the barcode part of the product. A part of the light is reflected back from the white surface to a receiver placed inside the head of the barcode scanner (also known as a photovoltaic cell) which translates the light into a voltage and after wards cross references it to a database to find out what product it scanned.

And that’s just how barcode scanners work.…

Teaching With Technology

Teaching with technology helps to expand student learning by assistant instructional objectives. However, it can be thought-provoking to select the best technology tools while not losing sight of the goal for student learning. An expert can find creative and constructive ways to integrate technology into our class.

What do we mean by technology?

The term technology refers to the development of the techniques and tools we use to solve problems or achieve goals. Technology can encompass all kinds of tools from low-tech pencils, paper, a chalkboard to the use of presentation software, or high-tech tablets, online collaboration and conference tools and more. the newest technologies allow us to try things in physical and virtual classrooms that were not possible before.

How can technology help students?

Technology can help a student through the following ways:

1. Online collaboration tools: Technology has helped the students & instructors to share document online, editing of the document in real time and project them on a screen. This gives the students a collaborative platform in which to brainstorm ideas and document their work using text and pictures.

2. Presentation software: This enables the instructor to embed high-resolution photographs, diagrams, videos and sound files to augment the text and verbal lecture content.

3. Tablet: Here, tablets can be linked to computers, projectors, and cloud so that students and instructors can communicate through text, drawings, and diagrams.

4. Course management tools: This allows instructors to organize all the resources students’ needs for the class. the syllabus, assignments, readings, online quizzes.

5. Smartphone: These are a quick and easy way to survey students during class. It is a great instant polling which can quickly access students understanding and help instructors to adjust pace and content

6. Lecture capture tools: The lecture capture tools allow instructors to record lectures directly from their computer without elaborate or additional classroom equipment. The record lectures at their own pace.

Advantages of technology integration in the education sphere?

The teaching strategies based on educational technology can be described as ethical that facilitates the students learning and boost their capacity, productivity, and performance. technology integration inspires positive changes in teaching methods on an international level. The following list of benefit will help in resolving a final conclusion:

1. Technology makes teaching easy: technology has power. It helps in the use of projectors and computer presentations to deliver any type of lesson or instruction and improve the level of comprehension within the class rather than giving theoretical explanations that students cannot understand.

2. It facilitates student progress: technology has made teachers rely on platforms and tools that enable you to keep track of individual achievements.

3. Education technology is good for the environment: if all schools have dedicated to being using digital textbooks, can you imagine the amount of paper and number of trees that will be saved. students can be instructed to take an online test and submit their papers and homework through email. They can be also encouraged to use readers to read …

Bitcoin: What Is It, and Is It Right for Your Business?

OK, so what’s Bitcoin?

It’s not an actual coin, it’s “cryptocurrency,” a digital form of payment that is produced (“mined”) by lots of people worldwide. It allows peer-to-peer transactions instantly, worldwide, for free or at very low cost.

Bitcoin was invented after decades of research into cryptography by software developer, Satoshi Nakamoto (believed to be a pseudonym), who designed the algorithm and introduced it in 2009. His true identity remains a mystery.

This currency is not backed by a tangible commodity (such as gold or silver); bitcoins are traded online which makes them a commodity in themselves.

Bitcoin is an open-source product, accessible by anyone who is a user. All you need is an email address, Internet access, and money to get started.

Where does it come from?

Bitcoin is mined on a distributed computer network of users running specialized software; the network solves certain mathematical proofs, and searches for a particular data sequence (“block”) that produces a particular pattern when the BTC algorithm is applied to it. A match produces a bitcoin. It’s complex and time- and energy-consuming.

Only 21 million bitcoins are ever to be mined (about 11 million are currently in circulation). The math problems the network computers solve get progressively more difficult to keep the mining operations and supply in check.

This network also validates all the transactions through cryptography.

How does Bitcoin work?

Internet users transfer digital assets (bits) to each other on a network. There is no online bank; rather, Bitcoin has been described as an Internet-wide distributed ledger. Users buy Bitcoin with cash or by selling a product or service for Bitcoin. Bitcoin wallets store and use this digital currency. Users may sell out of this virtual ledger by trading their Bitcoin to someone else who wants in. Anyone can do this, anywhere in the world.

There are smartphone apps for conducting mobile Bitcoin transactions and Bitcoin exchanges are populating the Internet.

How is Bitcoin valued?

Bitcoin is not held or controlled by a financial institution; it is completely decentralized. Unlike real-world money it cannot be devalued by governments or banks.

Instead, Bitcoin’s value lies simply in its acceptance between users as a form of payment and because its supply is finite. Its global currency values fluctuate according to supply and demand and market speculation; as more people create wallets and hold and spend bitcoins, and more businesses accept it, Bitcoin’s value will rise. Banks are now trying to value Bitcoin and some investment websites predict the price of a bitcoin will be several thousand dollars in 2014.

What are its benefits?

There are benefits to consumers and merchants that want to use this payment option.

1. Fast transactions – Bitcoin is transferred instantly over the Internet.

2. No fees/low fees — Unlike credit cards, Bitcoin can be used for free or very low fees. Without the centralized institution as middle man, there are no authorizations (and fees) required. This improves profit margins sales.

3. Eliminates fraud risk -Only the Bitcoin owner can …

Embedded Single Board Computers

Our world today is full of electronic devices. We see a lot of them in our homes, in our offices and at shopping malls. Each device has their own characteristic, and they are all equipped with computers embedded deep in their system. These small computers are called single board computers (SBCs).

Single board computers are small circuit boards that contain all the components (i.e. processor, memory, I/O, etc.) necessary to function as a complete digital computer. These computers are actually similar in appearance to your typical desktop computer motherboard, although much smaller. Single board computers are found in many applications we use today. They are often used as the base for personal computers like laptops and notebooks. Single board computers are designed to be integrated with other electronic components to form an industrial machine or an electronic product.

But how can the combination of a processor, memory, and other computer components automate the functions of a specific electronic product or industrial machine? There are actually two phases in the design of embedded single board computers. The first is the design of the computer hardware, and the second is the design of the computer software.

In the hardware design phase, a company in need of a new industrial machine may opt to design their own embedded SBC in-house. They hire engineers to design the SBC for them. Alternatively, they can ask an SBC manufacturer to make an embedded SBC custom-designed for their specific application.

Today, most companies purchase SBCs that are already pre-designed — often called off-the-shelf SBCs. As opposed to custom SBCs, off-the-shelf embedded SBCs adhere to certain standards that are determined by their form factor. Most common form factors for embedded SBCs are the PC/104, EBX and EPIC form factor.

So how can these off-the-shelf embedded SBCs perform a specific function if they have the same designs? The answer is the software design. For the computer to perform a specific function, a computer program must be developed instructing the computer what to do. Companies usually hire software engineers for this design phase. Embedded SBC manufacturers often provide extensive software support.…

Best Registry Cleaner – What to Look For

If you want to find the best registry cleaner for your computer, then this article was written for you. Specifically, we're going to talk about the different features each registry cleaner provides, the support they provide, and the pros and cons of free registry cleaners. By the time you have finished reading this article, you'll be able to find the perfect registry optimization software for you.

Let's start by talking about features. While most registry cleaners have the usual features of deep scan, localized scan and backup – some of the better products also have extra features like start-up managers and registry defragmentation. While these are not critical to have, they can be fairly useful.

Next, let's talk about support. Obviously, when you buy software, you may be concerned about the support which is provided – especially if you do not think of yourself as being "good" with computers.

Finally, let's talk about the differences between paid and free registry cleaners. While the obvious difference is the cost, it may be worth paying a few dollars for a more reliable software application. Paid software also offers to have better support and updates, where free cleaners are more likely to become obsolese.

To summarize, this article has given you some useful general information on registry cleaners. Specifically, we talked about the common features shared by registry cleaners, what to expect support-wise, and the differences between free and paid software. Now that you have finished reading, you should be better informed on finding the right software for your computer. …

What Are The Disadvantages Of Using A Gaming Laptop?

Some people love using laptops but also like playing games. Most know that playing games on standard laptops doesn’t always give that great of performance. Because of this you might have the temptation to go buy a gaming laptop. While it sounds nice to have a laptop that could play high end games on it, you really should consider the disadvantages of these first.

These machines cost some serious money. They aren’t cheap at all. You could purchase a gaming desktop and a very good laptop for the same price as just one gaming laptop. You are really cutting out many options by investing this kind of money in hardware like this.

The weight of it is a huge problem. While you might think it’s portable because it’s a laptop, it really isn’t that portable. It will be too heavy to carry around all day. Additionally, you will need a gaming mouse to go along with it which adds to the weight and makes it more complicated.

The battery life of these machines are fairly worthless since it’s running high power hardware. You will be stuck near a plug if you want to do anything more than an hour of gaming. This really defeats the purpose of using a laptop. Most people purchase laptops so that they can be portable.

There is a huge risk with these laptops. The parts on them tend to go bad quickly. You will have to service the whole computer versus repairing a part or two yourself like on a desktop. This will also up the cost of owning this type of computer over the long haul.

You can’t upgrade that easily. As a gamer you know it’s best to have frequent upgrades. A gaming laptop will become old much faster than a desktop that you can upgrade. Most gaming computer laptops have most of the upgrades already installed when you purchase if you are serious about gaming. This limits future upgrades which would require you to purchase a new model in order to upgrade.

Heat will make it uncomfortable to use and eventually kill your hardware. There is a limited life span with these devices compared to a desktop that can deal with heat better while playing games.

A gaming laptop is something that many want to buy. Find out the disadvantages to this and why you might avoid buying a computer like this. Ask you friends if they think it would be a good investment before you go out and purchase one of these gaming laptops.…

Why You Should Consider Upgrading Your Computer Hard Drive

Upgrading your hard drive is something that takes a little thought and preparation, if you have had your computer a while and built up an army of music, movies and personal stuff then you may be related to upgrade your hard drive in fear of losing all your data. This being said you can rest assured that you can easily copy all of your details across quickly and easily, keep in mind though you will need to keep following the points in mind.

  • Do you have an operating system disc to re-install your operating system?
  • Do you have all your hardware drivers, or can you get them?
  • Have you made a complete backup of all your personal files in case something goes wrong?

If you can answer yes to the above then you can easily upgrade or replace your hard drive yourself saving you time and money.

There are 3 main reasons you may want to change your hard drive: –

  • Not enough room on your current drive
  • Your current drive has become noisy when running
  • You have multiple errors on the drive causing it to run slow.

Another reason is the speed of your drive, many people are now upgrading from a 5400RPM drive to a faster 7200RPM drive simply to speed up the read / write time of the drive.

The steps involved in changing over your hard drive are quite straight forward.

  1. Ensure you have all your documents and everything you wish to keep on disc of other type of media that is separate to the PC, flash drive, external hard drive etc are perfect for this.
  2. Next turn off the power and remove the power lead.
  3. Remove the case of the base unit and locate the hard drive.
  4. Remove the Data Cable and power supply from the rear of the drive
  5. Remove the securing screws and extract the hard drive from the case.
  6. Install the new hard drive in the reverse order of the above.

Once you have your computer put back together you will need to start up your computer making sure you have your operating disc to hand, start up your computer and enter your BIOS and ensure your computer is set to boot from the CD Rom drive as the first device.

Insert your Operating disc in to the drive and exit the bios so your computer starts to boot.

Follow the onscreen instructions to install your operating system, once this has completed take the time to install any service packs and security updates available for your computer. Once you have completed this you can start installing your device drivers and lastly all your personal files.

Note even if you are unsure if you have an operating system, or how to boot from the CD drive then consult a professional to do the job for you! If you are familiar with installing operating systems and so on then you can easily tackle this upgrade. …

Top 10 Essential Application Programming Interface (API’s)

Web Service Application Programming Interface (API) is an interface implemented by a software program to enable interaction with other software, similar to the way a user interface facilitates interaction between humans and computers.

The API (Application Programming Interface) has been an essential component for creating applications that hook into or utilize web apps such as Facebook and Flickr. The practice of publishing APIs has allowed web communities to create an open architecture for sharing content and data between communities and applications.

In this way, content that is created in one place can be dynamically posted or updated in multiple locations on the web. Sharing live comments made on Twitter to a Facebook account, for example, is enabled by Twitter and Facebook’s APIs. With it, developers have been able to create some amazing mashups and tools. Some of the most helpful applications on the web wouldn’t be possible without APIs. Here are my pick of the best 10 on the web…

1. Google Maps API

The Google Maps API is the most used code on the web. It lets you embed Google Maps in your own web pages with JavaScript. The API provides a number of utilities for manipulating maps and adding content to the map through a variety of services, allowing you to create robust maps applications on your website. While most API’s are data servers, with the Google Maps API you take control of an instance of the application itself using JavaScript. To use a Google Maps you need an API key

2. Flickr API

Flickr is an image and video hosting website, web services suite, and online community. There are hundreds, if not thousands, of mashups that rely on the Flickr API to add a little bit of visual appeal. With 3-5 million new photos uploaded to the site daily and recently passing the 4 billionth photos, it’s no wonder that developers are excited to use it. It’s a simple call-and-response-based API, but with extensive tailored support for your chosen language. It communicates using REST, XML-RPC or Soap and gets your data back in XML, JSON or PHP. One of this API’s great strengths is the number of third-party developer tools and libraries. For more information on Flickr’s API visit the Official Flickr API documentation page, which offers a ton of information about using the API and links to third-party API kits.

3. Facebook Platform / Facebook Connect

Facebook is the king of the social media network. The site is driven by user contributions, offering coders a rare platform that hooks you directly into an eager audience. Facebook’s bespoke mark-up language – PHP and FBML are use for coding their Apps. With over 350,000 active applications on the Facebook Platform and Facebook Connect, that easily makes Facebook’s platform and Connect API among the hottest development platforms on the web today. More information on this can be found at the Facebook Developers site, one of the most complete and well-made and maintained developer sites on the web.

4. Twitter …