wireless

Faster WiFi {3}

by Ricardo C
This article relates to Wi-Fi speeds. A team of Japanese researchers has just broken the record for wireless data transmission in the terahertz range. This is 20 times faster than most current Wi-Fi connections. The researchers focused on an unregulated part of the electromagnetic spectrum between 300GHz and 3THz. Using these frequencies the researchers were able to develop hardware capable of transmitting at 3Gb/s  at frequencies up to 542GHz which is about 20 times faster than current Wi-Fi connection. According to the article this is just a concept and terahertz Wi-Fi would probably only work over short distances. read more...

Synchronizing database on mobile devices {2}

by Ricardo C
This article relates to the synchronization between mobile devices and databases. Since mobile technology as advanced and equipment have led to the emergence of a new computing environment and a variety of small sized mobile devices such as smartphones and PDAs that has been popularized. The problem is that mobile devices do not have much computing power and they rely on batteries; constant access to network is difficult due to narrow bandwidth. Mobile devices need to download the database when connected and then work off-line and by doing so there are inevitable inconsistencies between the server-side database and the mobile database. Commercial DBMS vendors offer solutions to maintain the database synchronized between the two devices however these solutions are dependent of the server-side database using dependent information such as metadata. Because of these restrictions, the extensibility, adaptability and flexibility of mobile business systems are markedly decreased. The article suggests the implementation of SAMD (Synchronization algorithms based on message digest) which resolves synchronization problems using only standard SQL queries. The SAMD makes the images at the table of the server-side database and the mobile database using a message digest algorithm; then the images and the message digest values are saved in the message digest tables on both sides. The images are compared and select the rows needed for synchronization. The SAMD would provide extensibility, adaptability and flexibility. read more...

Controversies over Wi-Fi Data {3}

by Jim J
 

The FCC recently cleared Google of wrongdoings regarding their actions in the breech of data two years ago. Google is accused of harvesting data from their “Street View” cars that they gathered from Wi-Fi networks. In the process of aggregating data with people’s wireless networks, Google also accidentally gathered private information such as passwords and email addresses from the wireless networks. Though this was not their purpose in collecting the information, Google inadvertently did so because of plethora of data they were collecting. And to top it off, they got away with it as not being a crime because the data use public airwaves that are accessible by anyone; the argument is that its similar to one sending vital information using Walkmans on a frequency others can listen into. The final point is the only way for personal information to truly be secure is through encryption and with password-protection. read more...

Database could decrease crimes {2}

by Ricardo C
This article talks about how a database could reduce crimes. According to the article, an average of 40% of robberies involve cell phones. The majority of these robberies are violent and with serious injuries. The database promises that wireless providers will deactivate your mobile device if you report it stolen. The major wireless providers of USA sprint, AT&T, Verizon and T-Mobile are participating in this database with the purpose to decrease the desire of thieves for stealing mobile devices. Since after deactivating the devices they become as useless as an empty wallet, there is no incentive to steal them. Thieves steal these devices with the intention of reselling them, most likely overseas. According to the article, these four companies mentioned earlier account for the 90% of mobile devices in the USA which mean that this centralized database will cover the majority of the cell phones currently in use. This database will be in effect within six months in the USA and within 18 months globally.
Besides the centralized database, authorities are promoting customers to educate themselves about the use of personal data on mobile devices. Some of these advices are to keep your divides password protected, write down your device’s model and serial number, etc. The article did not disclose the cost of these initiative but certainly the concern here isn’t cost. read more...

Database Management in an Ad Hoc Network {2}

by Vincent S
Today I am posting about an article I found in the ACM Digital Library.  The article was a peer reviewed journal submission presenting a solution on how to manage a database in a mobile ad hoc network.  For those you are not familiar, an ad hoc network is a wireless network in which no network management device is present (switch, router, hub, bridge) and all host devices have wireless capabilities.  The reason for such a network to exist would be for circumstances in which a wired network would be difficult to set-up and maintain.  Such a scenario could include in battle or more relevant to this class would be for disaster recovery for a business in an emergency situation.  Possible challenges that might present themselves to a database administrator are easily intercepted and comprimisable data, lack of data integrity, and network collisions that might cause the loss of data due to lack of network management.  The authors of the article posted various solutions to these challenges. read more...