A virtual machine is a software-based replica of a physical machine such as a computer. A virtual machine is entirely independent from any physical hardware and can only use resources that have been added to the virtual machine. There are two types of virtual machines: system virtual machines and process virtual machines. System virtual machines contain all of the standard features that would be found in an operating system while process virtual machines are designed to carry out a specific function and are made to mimic a specific program. How Read More

E-mail and Web sites have evolved into being important mechanisms for a vast number of organizations. Internet connectivity or connections support a company’s business in a number of ways. Company employees use the Internet to exchange e-mail with other employees at different branch offices, and with business partners and suppliers; to access the LAN when working from home; to conduct research using the Web; and mobile users utilize the Internet to remotely access the LAN. Each organization would have different requirements when it comes to Internet connections. Some organizations might Read More

On Overview on Group Policy Object (GPO) Implementation and the Group Policy Object Editor Group Policy settings are stored in a Group Policy Object (GPO). The types of Group Policy settings which can be stored in a GPO are listed below: Computer configuration settings are located in the Computer Configuration node. User configuration settings are located in the User Configuration node. A Windows 2000 and Windows Server 2003 computer has a local GPO. A local GPO exists only on that particular computer, and therefore only affects the computer on which Read More

Hindsight bias is when people exaggerate their confidence in an event that occurred based on predictions that were made prior to the event’s occurrence. Hindsight bias is just one type of bias that the brain uses to store and recall information. This is because people tend to focus on an event that occurred rather than the possible alternatives that did not. Hindsight bias is most commonly seen in prophecies, meteorology, and current events. How Does Hindsight Bias Work? Hindsight bias is a very common occurrence and only those who understand Read More

Vehicle platooning is one of the innovations in the automotive industry that aim to improve the safety, efficiency, mileage, and time of travel of vehicles while relieving traffic congestion, decreasing pollution and reducing stress for passengers. One of the recent demonstrations of this technology was during the PATH program done in California by 8 Buicks operating as a platoon. Advantages of Vehicle Platooning Maximizes Highway Throughput Vehicle platooning makes it possible for vehicles to travel together closely yet safely. This leads to a reduction in the amount of space used Read More

Credit cards use the Luhn Check Digit Algorithm. The main purpose of the Luhn Check Digit Algorithm is to catch data entry errors, but it does double duty here as a weak security tool. The Luhn Check Digit Algorithm For a card with an even number of digits, double every odd numbered digit (1st digit, 3rd digit, 5th digit, etc…) and subtract 9 if the product is greater than 9. Add up all the even digits (2nd digit, 4th digit, 6th digit, etc…) as well as the doubled-odd digits, and Read More

If you already own a high definition television set and receiver, you can pick up HDTV signals for free with an HDTV antenna. If you live in a metropolitan area or large suburb, you will probably be able to pick up all network TV stations including ABC, NBC, CBS, Fox, and PBS with the help of an HGTV antenna. In addition, depending on the area you are from, there may be a few other HDTV channels that are available for free and easily picked up with an HDTV antenna. An Read More

Activating Windows 7 is different than registering Windows 7. When you register, you let Windows know you exist so they can add you to their roster. When you activate Windows 7, you verify that the copy you have is legal. In other words, you punch in a key code that lets Windows know that you purchased a legal copy rather than getting a pirated copy. It's necessary to activate because if you don't, you won't have access to all of the Windows features after thirty days. You can activate two Read More

The main mobile telephone systems in the last twenty five years have been: YearMobile Telephone System 1981 Nordic Mobile Telephone (NMT) 1983 Advanced Mobile Phone System (AMPS) 1985 Total Access Communication Systems (TACS) 1986 Nordic Mobile Telephony (NMT) 1991 American Digital Cellular (ADC) 1991 Global System for Mobile Communication (GSM) 1992 Digital Cellular System (DCS) 1800 1994 Japanese Personal Digital Cellular (PDC) 1995 Personal Communications Service (PCS) 1900 – Canada 1996 Personal Communications Service (PCS) – USA Analog and Digital Mobile Telephone Technologies Mobile telephone systems are either analog or Read More

Conceptually, hypersonic sound (HSS) systems do to sound what laser technology does to light – focus sound into a tight beam that can travel great distances without dispersing. HSS systems can create sound that is meant only for a certain individual(s), not for everyone who just happens to be in the vicinity. HSS Speakers versus Conventional Speakers A conventional sound system is comparable to light bulbs. Speakers broadcast sound waves indiscriminately over a wide area – just as a conventional light bulb emits light indiscriminately over the whole room. HSS Read More