Views can be utilized as a form of security in the database. Let’s say you have a table called EMPLOYEE_TBL. The EMPLOYEE_TBL includes employee names, addresses, phone numbers, emergency contacts, department, position, and salary or hourly pay. You have some temporary help come in to write some reports; you need a report of employees‘ names, [...]
The human mind is very good at multitasking. We often do many tasks at once, for example, talking on the phone while beating an egg while keeping watch on our child, all while tapping a foot to a song we heard on the radio earlier this morning.
When you build a Web site, you construct an island. Forget the Information Superhighway analogy. The Web isn’t a stretch of road lined with sites that everyone notices. The Web is much more like a vast ocean of information—an ocean with very few navigational tools. The success of your site depends on your ability to [...]
What to do if the hackers get in
In spite of all your efforts, a hacker may still manage to break into your system. When this happens, you must first assess the damage. Hackers often break into a system just to prove they can do it, and they may not cause any serious trouble or steal [...]
E-mail is the most popular application on the Internet. More people want e-mail than want access to the Web. E-mail packs real power, both as a communications medium and a promotional tool. You can prompt users to pop in to your site frequently by delivering to them regular, compelling e-mail newsletters filled with juicy teasers, [...]
Anyone with proper access to the company’s computer network can read any e-mail message coming in or going out to the Internet. As a result, determining whether Steve Smith is sending a price quote to a customer or a résumé to a competitor is as easy as scanning his e-mails.
Just because this is technically simple, [...]
The mobile market is growing faster than ever. Since the release of iPhone, the Apple is trying to rule out the market.
RIM has prepared to win the fight, brought a big gun. RIM announced its latest touch screen handset. The Blackberry seems to go head to head with Apple.
Speech is a major initiative for Microsoft. It is part of a larger concept referred to as the Natural User Interface, or Natural UI, which involves creating natural and expressive interactions with the user. This is primarily accomplished using speech-processing capabilities but can also involve natural language and machine learning. The Natural UI is intended [...]
Here is the true device that small to large businesses want: Gateways between Skype and Private Branch Exchanges (PBXs). Several vendors are developing Skype PBX gateway devices which will permit a user on a PBX to make Skype or SkypeOut calls, and which will allow an incoming Skype or Skypeln call to be routed to [...]
Recovery Strategies
The recovery strategy will be built around the backup strategy. Any recovery situation naturally implies that some failure has occurred. The recovery action will depend on what that failure was. As such, a recovery strategy will consist of a set of failure scenarios and their resolution. The aim of this section is to categorize [...]
Reactive protocols are designed to minimize routing overhead. Instead of tracking the changes in the network topology to continuously maintain shortest path routes to all destinations, these protocols determine routes only when necessary. Typically, these protocols perform a route discovery operation between the source and the desired destination when the source needs to send a [...]
Key Smart Sensor Features
Through my involvement with sensor networking standards development, I have noted key features that enable sensors to be used in smart sensor networks: unique identification, efficient and standardized communication protocols, automatic networking, self-test and self- calibration, self-describing (e.g., TEDS), self-locating, and time coordination.
A universal unique identification (UUID) code that takes the place [...]
Spectrum Management
As just mentioned, all wireless standards must be fully compliant with the government’s FCC rules, especially concerning carrier frequencies and output power. The FCC has established license-free industrial, scientific, and medical (ISM) frequency bands suitable for wireless- sensor systems.
One choice to be made in the deployment of wireless sensor networks is in the frequency [...]
Bandwidth and Range
The most fundamental parameters for selecting the proper sensor network are bandwidth (or throughput) in bits per second (bps, kbps, Mbps) and range (meters, kilometers, feet, or miles). The physics of RF communications are such that throughput goes down with increased range, assuming all other parameters are held constant. In fact, many 802.1 [...]
It may seem that using wireless systems to replace common links, like serial cables, is easy and straightforward. That is not often the case. Here are some common problems encountered when replacing wired systems with wireless:
RF links are not as dependable as wires. Anyone who has used a cell phone, portable radio, or CB knows [...]
Properly speaking, ‘Internet‘ is the name of a communication protocol (IP = Internet Protocol), which unsurprisingly is central to the communication between your computer and the rest of the world. However, the name has also come to be applied to the global network of computers connected using this protocol; this is perhaps the most common [...]
There are two vital dimensions required to satisfy the e-customer. The service must have an electronic structure that is usable and the process that supports it must have standards of delivery that make it enjoyable.
The e-customer will not find your service useful if it is not usable. He interacts with your service through a screen [...]
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The worldwide scope of an electronic commerce offer must rely on a set of physical and logical solutions to meet users’ expectations. Not all customers are computer wizards, and the architecture must account for ergonomic factors, in addition to the security of the exchanges and the different methods for accessing the telecommunications network. This section [...]
