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• Where can I safely learn about computer security?

  - by Ammar Ahmed

  I find it really hard to find resources about computer security. I asked questions on message boards about key loggers and viruses and I got negative assumption from people assuming the the worse. Also, I don't think that I can trust random message boards. I know that it is a broad topic, but are there any good websites that I can follow and learn from that are targeted to beginner with some samples? I am a developer (or at least want to be one) and I have a CS degree if that helps.

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• Computer-controlled Lights and Music Synced into Christmas Rock Spectacular

  - by Jason Fitzpatrick

  This spectacular computer controlled and synchronized lighting display combines thousands of feet of LED lighting, multiple controllers, and a rock medley to great effect. The above display started life as the personal Christmas light display of Sioux Falls, ND resident Joe Noe. When Noe moved, he donated his display to a local mall in order to preserve the tradition of people stopping by to see it and making donations to the Make-A-Wish foundation. The local mall, Western Mall, expanded the display and added in even more LEDs and controllers. The end result is an impressive display synced to a Christmas rock medley by UK musician Richard Campbell. [via Mashable] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Which computer side has more salary chance in future programmer , sys admin , network admin , web developer

  - by Name

  I want to know which computer field has more probability of getting high salary with experience in the following fields 1)Programmer c , c++ , java 2)Sys admin MIcrosoft . linux 3)Network admin (Cisco ccna ccnp 4)web developer Any more idea will be good i work as web developer for 3 years and stiing at 40K$. I have to find new job and still look like i don't have offer more than 50K. may be i have chosen the wrong path. My friend in network admin has started from 65K and with experince he is going the ccnp or ccie with more high packages. I may e wrong , please correct me

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• Mirroring Ubuntu on several systems in a computer lab

  - by Harvey Steck

  I am working in a new refugee school where the only Internet service available is a slow satellite connection. We are about to set up a computer lab (already have desktop systems and am about to install Ubuntu on them). I'm a newbie when it comes to Linux, but it seems a better alternative than pirated copies of Windows. I'd like to set up one Ubuntu system, and then mirror that system on perhaps ten to twenty other systems (all of which would be on an ethernet network). I expect to have an internet connection on the one system that I set up, but then it may be difficult to have enough bandwidth to go through all the same steps on the other ten systems. Can I set up the other ten or twenty computers to get all of their updates/upgrades/configuration from one master system? Can I also set things up so that students cannot change the configuration, install new programs, etc.? Appreciate any help you can give. -- Harvey

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• How to teach computer science ?

  - by proferikson

  I am just starting to teach computer science. It's just the basic level. I'm finding that I sometimes don't know how to approach topics in a way that lets students easily understand. I've found that the best thing is to use analogies. A terrible one, that worked well, was presenting recursion by using the process of eating a burger. (You eat one bite, then you eat the rest). Interesting real world examples do wonders here. I'd like to know the techniques you have used for teaching, or teachers you've had have used that proved particularly effective. I'd also like to know your best analogies and examples for topics in CS101, especially for those harder to grasp topics. I'm teaching the class in Java (as required).

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• How is time calculation performed by a computer?

  - by Jorge Mendoza

  I need to add a certain feature to a module in a given project regarding time calculation. For this specific case I'm using Java and reading through the documentation of the Date class I found out the time is calculated in milliseconds starting from January 1, 1970, 00:00:00 GMT. I think it's safe to assume there is a similar "starting date" in other languages so I guess the specific implementation in Java doesn't matter. How is the time calculation performed by the computer? How does it know exactly how many milliseconds have passed from that given "starting date and time" to the current date and time?

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• How to Quickly Check If Your Computer Can Run a PC Game

  - by Chris Hoffman

  PC gaming isn’t quite as simple as console gaming. If you have a laptop with weak graphics hardware or an older PC, it’s important to check whether your computer can support a game before you spend your hard-earned cash. Gamers don’t have to upgrade their hardware as often as they used to. Even a gaming PC built years ago should be able to handle the newest games just fine. Laptops not build for gaming and older PCs are a different matter.    

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• Battery discharges while computer is off

  - by Nuno Finote

  I bought a hp 15-r003np 2 weeks ago and installed ubuntu 14.04 LTS with dual boot (to windows 8). When i shutdown ubuntu, in the next day battery has 85% of charge, despite the computer shutdown. If i power off in windows battery charge is 100% in the next day. Does anyone have noticed the same problem? I think the network adapter is not on wol mode, seen via windows network config properties. I need help to solve this problem... (it's not right to work around restarting to windows to do the shutdown properly...)

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• Computer Arithmetic - Binary for Decimal Numbers

  - by MarkPearl

  This may be of use to someone else doing this course… The Problem In the section on Computer Arithmetic it gives an example of converting -7.6875 to IEEE floating point format. I understand all the steps except for the first one, where it does the following... 7.6875 (base 10) = 111.1011 (base 2) I don't understand the conversion - I realize that 111 (base 2) = 7 (base 10), but how does the .6875 part relate to the .1011? Or am I totally off track with this? The Solution The fractional part of the decimal to binary conversion is done as follows: 0.6875 x 2 = 1.375 = 0.375 + 1 (Keep the 1 separate) 0.375 x 2   = 0.75   = 0.75    + 0 0.75 x 2    = 1.5      = 0.5      + 1 0.5 x 2     = 1.0       = 0.0       + 1 The bit pattern of 0s and 1s on the right-hand side gives you the fractional part. So 0.6875 (base 10) = .1011 (Base 2) See also Stallings, chapter 19.

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• Weird graphical errors in console and on computer shut down

  - by Mark A.

  I am all new to Ubuntu (and Linux in general) and I am experiencing some strange graphic on my screen. Console #1 (ctrl+alt+f1): Exactly the same happens on all the other consoles (2-6), and the consoles don't seem to work. And I see the same when I hibernate or shut down my computer, but not when I suspend it. I was thinking that it may have something to do with the SiS 671 video driver work around that I use? http://ubuntuforums.org/showpost.php?p=11476910&postcount=773 Any ideas how to fix this?

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• Can Dust Actually Damage My Computer?

  - by Jason Fitzpatrick

  Thousands of hours per year of fan-driven air movement combined with electrostatic charges make computers veritable dust magnets. Is all that dust simply a nuisance or is it actually harmful? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It?

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• How to change address and name of the computer in linux Ubuntu

  - by Byakugan

  I have troubles again after upgrading Linux to version 12.04 - When I try to update progams and files with "apt-get update" it says something like there is no address added to your computer name. So my hostname has name "Marco" and my hosts file has line "127.0.0.1 Marco" So where is problem? Where should I change my name to get it right for updates? Thank you. Before on version 11.10 it was working fine. W: Failed http://en.archive.ubuntu.com/ubuntu/dists/precise-updates/main/i18n/Translation-en Something bad happened in the translation "en.archive.ubuntu.com: http" (-5 - The machine name is not assigned to any address)

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• computer doesn't boot from usb ubuntu installer when trying to install it alongside windows 7

  - by ali

  I'm very noob at linux and installing techniques. I want to install ubuntu 12.04 from bootable usb flash alongside windows 7 ( also tried live CD but now working ) but computer is not booting from usb flash or LIVE-CD and boots windows 7 ( acer aspire 4750g ). and of course I have set the bios priority in the right way. There is one important point to tell that I have installed Fedora 16 on my laptop successfully and now I have it on my system. when I was trying to install fedora i got some error and searched about it and got this point that I should delete a .efi file and then installation went right. In this case , what should I do to solve the problem? ( I also don't need my Fedora anymore )

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• Distance Education in Computer Science - HCI

  - by Rionmonster

  I have been a software engineer / graphic designer for a few years and have recently been considering furthering my education in the field. (It was actually a very generous Christmas present) I would primarily be interested in something like Human Computer Interaction or a similar "creative technology" that involves heavy UI/UX Design, prototyping or Information Architecture. Anyways - I still plan on working full-time and was looking into part-time distance programs and was wondering if anyone had some experience with pursuing a similar degree (either from a distance or in-person) and could share their experiences. Thanks!

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• Phone pictures not showing in UbuntuOne folder on computer

  - by user34924

  I downloaded the Android app for my phone and set it up to move my pictures from the phone into UbuntuOne. When I go to the UbuntuOne web site the folder shows up and I can view the pictures after I download them. But when I open the UbuntuOne folder on my laptop, the folder with the pictures from my phone isn't listed. How can I get the picture folder to show up in the UbuntuOne folder on my laptop? I was hoping this would be an easy way to get photos from phone to computer.

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• Creating a bootable USB recovery drive to be used by someone who isn't computer savvy

  - by David

  I am looking for a way to prepare an image of an Ubuntu machine which would be bootable and installable in the easiest way possible. I'm actually preparing an Ubuntu machine for someone living far, and not computer savvy. If he ever has troubles with his installation, he could just put a USB drive in, boot the machine and everything would be resetted for him. I know there are many methods of creating/loading an image of a drive, but the ones I've found so far have complicated menus with several options to choose from, etc. Ideally, perhaps only asking a Yes/No question such as "Would you like to reinstall?" would be great. Does such a tool exist? Thank you in advance!

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• Which numeral systems are useful in computer science?

  - by authchir

  I am wondering which numeral system different programmers are using, or would use if their language has support for them. As an example, in C++ we can use: Octal by prefixing with 0 (e.g. 0377) Decimal by default (e.g. 255) Hexadecimal by prefixing with 0x (e.g. 0xff) When working with bitmask, I am using hexadecimal but would sometimes want to be able to express binary numbers directly. I know some programming language support it with 0b syntax (e.g. 0b11111111). Is there any other numeric system useful in some computer science domain (e.g. cryptography, codecs, 3D graphics, etc)?

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• How To See Who Logged Into a Computer and When

  - by Chris Hoffman

  Have you ever wanted to monitor who’s logging into your computer and when? On Professional editions of Windows, you can enable logon auditing to have Windows track which user accounts log in and when. The Audit logon events setting tracks both local logins and network logins. Each logon event specifies the user account that logged on and the time the login took place. You can also see when users logged off. How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It

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• Ubuntu12.10 not installing on new computer?

  - by Joshua

  I'm trying to Install the latest 12.10 Desktop. I have burned the iso file onto a DVD using an ISO burner. I then reboot my computer, and use the boot menu, I choose the DVD and it asks me if I want to try it, install it, or check for defects. Whichever one I choose my screen goes blank and for a bit you can hear my DVD burner, but then it stops and the screen goes completely blank and doesn't so anything. I am using a new HP Pavilion model P7-1455 running windows 8. What is wrong? How can I fix this?

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• What To Do If You Get a Virus on Your Computer

  - by Chris Hoffman

  Whether you saw a message saying a virus was detected or your computer seems slow and unreliable, this guide will walk you through the process of dealing with your infection and removing the malware. While many viruses and other types of malware are designed simply to cause chaos, more and more malware is used by organized crime to steal credit card numbers and other sensitive data. Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference

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• restarted my computer and my wireless icon was missing and my sound no longer works

  - by Justin Otto

  I recently updated to 12.04 on my sony vaio VGN-N110G. I've had ubuntu on this laptop since 10.04 and haven't had any real problems. so i restarted my computer today and none of the unity desktop background showed up only the desktop with the files on it so i brought up the terminal and entered in unity -replace and restarted it and it came back up fine except that i noticed that my panel only had mail, volume, date/time, and power icons no wireless or bluetooth, i tried a couple of approaches to try and get it working again i tried nm-applet --sm-disable and it brought up a warning message, i'm not very skilled in code even though i've had ubuntu for four years but in the past versions it wasn't too big a problem

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• Computer Freezes After GRUB

  - by paulmcg421

  Ok so I've just built my first computer and have got it running, here are the specs: Asus P8Z68-V PCI-E LX Motherboard, Intel Core i5-2500K, Patriot Memory 8GB (2 x 4GB), Viper Xtreme Series PC3-15000 1866MHz CL9 Division 2 Edition Memory (PXD38G1866ELK), Gigabyte ATI Radeon 6850 820MHz 1GB PCI-E HDMI OC Windforce 2x 500w Ezcool 24pin psu as standard. The only thing I haven't bought new is the hard drive, it's a 250gb that I removed from an Acer Aspire M5100 that I was using till now with no OS Problems. On start up it runs fine but is unresponsive after the GRUB menu disappears to load Ubuntu (Oneric Ocelot). The keyboard lights then turn off and the screen eventually returns that there is no signal. Is there anything that I could be missing from building? (This is my first attempt at building my own PC) Any input would be appreciated, thanks !

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• Reporter seeking comments on computer science education [closed]

  - by user63982

  I'm a reporter doing a story for a tech website on computer science education, the need for software engineers, and the proficiency of new engineer hires. I would love to chat or exchange emails with anyone on this site who has an opinion on cs education and whether it did or did not prepare them for a job, and the pluses and minuses of the theoretical vs. the practical. I saw 1051's post and its comments and would love to connect with the poster and any of the commenters. Or anyone else with an opinion. I look forward to hearing from you. Thank you.

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• How To Remote Control Your Home Computer From Anywhere With VNC

  - by Chris Hoffman

  VNC allows you to remotely access a computer and use its desktop, either over the Internet or from another room in your house. Windows includes a Remote Desktop feature, but it’s only available in Professional editions of Windows. Some people may prefer TeamViewer or another service instead, but VNC allows you to install and manage your own server without using a centralized service. VNC clients and servers are available for all platforms, but we’ll be covering Windows here. Image Credit: photosteve101 on Flickr How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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• Computer won't wake from hibernate

  - by Icoo

  So I have a pretty dumb problem...I accidentaly pressed Hibernate while trying to Restart...since then my computer wont boot into Ubuntu anymore (through normal mode or single user mode - rescue mode that is)...all I get is: mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys/ on root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or dirctory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= boot arg. BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Obviously I tried to fire up the Live CD and run fsck (or e2fsck) from there (or just try to do a Check of /dev/sdb1 my partition via gparted - which is basically the same thing). But it doesn't allow me...both gparted and fsck say that the device is busy (I can't even mount it in the LiveCD to rescue data)...umount /dev/sdb1 says its not mounted...any ideas?

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