Digitized Signature Barcode Concept

2.15.2 The Difference between Snack Machine and Automated

Vending Machine A snack machine dispenses items like candy, gum, peanuts, cookies, sandwiches and other supplements to lunch or dinner. A vending machine will mix coffee, tea, soup, hot chocolate and other liquid supplements. Other vending machines sell cigarettes, sundry items tissues, combs, nail clippers, etc. and flowers. Still others will make change while the ultimate the ATM allows you the borrow money from your bank 24 hours per day which our certificate vending machine talk about it and it’s similar to the ATM. [16]

2.16 Digitized Signature

A digitized signature not to be confused with a digital certificate is an electronic signature that can be used to authenticate the identity of the sender of a message or the signer of a document, and possibly to ensure that the original content of the message or document that has been sent is unchanged. Digital signatures are easily transportable, cannot be imitated by someone else, and can be automatically time-stamped. The ability to ensure that the original signed message arrived means that the sender cannot easily repudiate it later. A digitized signature can be used with any kind of message, whether it is encrypted or not, simply so that the receiver can be sure of the senders identity and that the message arrived intact. [17]

2.17. Touch Screen Concept

A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen. There are three types of touch screen technology:  Resistive: A resistive touch screen panel is coated with a thin metallic electrically conductive and resistive layer that causes a change in the electrical current which is registered as a touch event and sent to the controller for processing. Resistive touch screen panels are generally more affordable but offer only 75 clarity and the layer can be damaged  by sharp objects. Resistive touch screen panels are not affected by outside elements such as dust or water.  Surface wave: Surface wave technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touch screen panels are the most advanced of the three types, but they can be damaged by outside elements. [18]  Capacitive: A capacitive touch screen panel is coated with a material that stores electrical charges. When the panel is touched, a small amount of charge is drawn to the point of contact. Circuits located at each corner of the panel measure the charge and send the information to the controller for processing. Capacitive touch screen panels must be touched with a finger unlike resistive and surface wave panels that can use fingers and stylus. Capacitive touch screens are not affected by outside elements and have high clarity. Touch screen monitors are no longer confined to bar video games as novelty items. Today, they can be found in many stores as part of cash registers, in car dashboards and on many portable computers. With the growing popularity of touch screen enabled Palm Pilots and other PDAs, many people even have one in his or her pocket at all times.

2.17.1 The touch screen benefit

The benefits of such technology are obvious. Rather than lugging along extra input devices such as a mouse or a keyboard, the user need only his finger to manipulate the chosen device. But its not just mobile devices that benefit from this type of input. All kinds of devices can be equipped, including TV and computer monitors, LCD screens, and the older CRT computer monitors. As a result, a bartender can press on a screen to ring up drinks on a busy night rather than type in a price, a nurse can input patient information with one hand. Truly, the possibilities with touch screen monitors are endless. [18]

2.18 Barcode Concept

What is a Barcode? A bar code often seen as a single word, barcode is the small image of lines bars and spaces that is affixed to retail store items, identification cards, and postal mail to identify a particular product number, person, or location. The code uses a sequence of vertical bars and spaces to represent numbers and other symbols. A bar code symbol typically consists of five parts: a quiet zone, a start character, data characters including an optional check character, a stop character, and another quiet zone. [19] A barcode reader is used to read the code. The reader uses a laser beam that is sensitive to the reflections from the line and space thickness and variation. The reader translates the reflected light into digital data that is transferred to a computer for immediate action or storage. Bar codes and readers are most often seen in supermarkets and retail stores, but a large number of different uses have been found for them. They are also used to take inventory in retail stores; to check out books from a library; to track manufacturing and shipping movement; to sign in on a job; to identify hospital patients; and to tabulate the results of direct mail marketing returns. Very small bar codes have been used to tag honey bees used in research. Readers may be attached to a computer as they often are in retail store settings or separate and portable, in which case they store the data they read until it can be fed into a computer. When you purchase an item from any store, you will notice a label with thin, black lines across it, along with a variation of different numbers. This label is then scanned by the cashier, and the items description and price automatically come up. The word for this is called a barcode, and it is used to read data and information based upon the widths of those small black lines. The barcode has many uses, although most of us think of them as simply a way to price items in the grocery or department store. Barcodes are becoming more and more common in just about every facet of consumer life. For example, car rental companies now identify their rental vehicles by using a barcode. Your luggage gets assigned a barcode when you check it into the airport in order to assure more accuracy when it comes to keeping track of it. Even drivers licenses today have barcodes on them in most states. Medicine prescriptions, library books, and tracking different shipments are also other ways that a barcode can be used. [19] So what exactly is a barcode? The technical definition for a barcode is a machine readable form of information on a scan able, visual surface. They are also often known as UPC codes. The barcode is read by using a special scanner that reads the information directly off of it. The information is then transmitted into a database where it can be logged and tracked. Merchandisers and other companies must pay an annual fee to an organization called The UCC, or Uniform Code Council, who then generates special barcodes specific to that particular company. Each number on a barcode has a special meaning, and often these numbers are added, multiplied, and divided in some formula that gives them each their own special individuality. Barcodes are very useful for maintaining accurate information about inventory, pricing, and other important business-related data. Different companies barcodes use a different amount of number and bar combinations. Some of the larger manufacturers will have a longer number, but this goes much deeper than how many numbers are listed. Every single number on a barcode has a meaning. For example, if the barcode number starts with a 0, then it is whats known as a standard UPC number. If the number begins with a 1, then it is whats called a random-weight item, meaning the price of the item will depend on its weight. This is typically applied to such things as meats, fruits, or vegetables. If an item starts with the number 3, it is a pharmaceutical. There are several other variations of these numbers, and each one represents something different. If a coupon is used that has a barcode, information goes through a system that links that coupon and its value to the item previously scanned, and then the amount is automatically deducted. A complex computerized system reads every single barcode that is scanned, but these barcodes are system-specific depending on what company they belong to. There are ways the average consumer can decode a barcode if they know what to look for and are familiar with the variations of numbers. Barcodes make our lives much more efficient, and shopping much faster. [19]

2.19 PostgreSQL