Tecnologia da Informática Márcio Francisco Dutra e Campos

Archive for July, 2013

Reversing Bits in C

07.31.2013 · Posted in Eng. Computação

“Interesting lessons can come from unexpected places! I was pleasantly surprised at how something as “simple” as reversing bits in a byte could lead me on an unexpectedly deep exploration: operation vs instruction count, memory access patterns and cache behavior, and low-level CPU instructions. It’s often very easy to make assumptions about the performance of ...

Ethernet Turns 40

07.31.2013 · Posted in Eng. Computação

“On Ethernet’s 40th anniversary, the IEEE History Center shares excerpts from the oral history interview it conducted with Ethernet’s co-inventor Robert Metcalfe in February 2004.” Leia o artigo em: http://theinstitute.ieee.org/technology-focus/technology-history/ethernet-turns-40 ...

Android Fragmentation Visualized

07.31.2013 · Posted in Eng. Computação

“Fragmentation is both a strength and weakness of the Android ecosystem. When comparisons are made between Android and iOS the issue of different API levels, and the vastly different devices running them, is often emphasised. In this report we examine the extent of Android fragmentation and analyse its impact on both users and developers.” Leia ...

The History of CTRL + ALT + DEL

07.15.2013 · Posted in Eng. Computação

“Some days, you’d be rebooting every five minutes as you searched for the problem,” Bradley says. The tedious tests made the coders want to pull their hair out. So Bradley created a keyboard shortcut that triggered a system reset without the memory tests. Leia o artigo em: http://mentalfloss.com/article/51674/history-ctrl-alt-delete ...

Ham Radio Is Not Dead

07.15.2013 · Posted in Eng. Eletrônica

Do tempo das válvulas … de quando ainda não existia a Internet. Quando estudante de eletrônica e telecomunicações, eu sonhava em um dia ser um rádio-amador.  Por incrível que pareça, eles continuam ativos. Leia o artigo em: http://spin.atomicobject.com/2013/07/13/ham-radio-is-not-dead/ ...

State of the Internet

07.03.2013 · Posted in Eng. Computação

“Each quarter, Akamai publishes its “State of the Internet” report, based on data gathered across Akamai’s global server network. “State of the Internet” highlights attack traffic, connection speeds, Internet penetration, broadband adoption, and mobile usage, as well as trends seen in this data over time.” ...

Internet Exchange Map

07.03.2013 · Posted in Eng. Computação

“The Internet Exchange Map is a free resource from TeleGeography. Data contained in this map was complied by TeleGeography and is updated on a regular basis.” Ver o mapa em: The Internet Exchange Map is a free resource fromTeleGeography. Data contained in this map was complied by TeleGeography and is updated on a regular basis. ...

Buffer Overflow Attack Explained

07.01.2013 · Posted in Eng. Computação

“Buffer overflow attacks have been there for a long time. It still exists today partly because of programmers carelessness while writing a code. The reason I said ‘partly’ because sometimes a well written code can be exploited with buffer overflow attacks, as it also depends upon the dedication and intelligence level of the attacker.” Leia ...