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• Computer Lab School for Orphans

  - by Brendon

  I am helping out an NGO, called Orphans Found Fund, here in Arusha Tanzania setup a computer lab to teach students about Ubuntu and open source applications. I have installed Ubuntu 10.10 on all the systems. What I'm wondering about is how to tweak the systems so that the kids cannot: Delete or alter system files Alter the system settings Add or remove applications Exceed a time limit (like an Internet Cafe) Also as the administrator I would like to monitor the usage for another system to make sure that abuse of network is not taking place. Any advice is much appreciated. Brendon

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• Creating your own computer! [closed]

  - by AntonioCS

  I recently found this article on a guy that built his own computer. It's just a bunch of wire (as far as I can tell any way) and I was just wondering what would I have to learn/read/do to make such a thing (or at least to have a really basic understanding of what he did). He also made his own operating system, which I find really impressive. I know it will take a while and I am in no hurry. Note: I am a web programmer and also have done some desktop apps (a few years ago).

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• Computer science [closed]

  - by user73589

  I'm a computer science graduate Information systems department. I graduated this year with GPA 3.8 but I'm totally lost, we didn't work on making applications and writing a lot of codes at college. I feel that if I applied in any job I won't be taken because I don't have any knowledge. I'm a very hardworker but I don't know from where to start and what to do. Should I go for web design and that staff or for Android and mobile applications? What can I do and how to start?

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• Can my computer run Ubuntu? [duplicate]

  - by Harry B

  This question already has an answer here: How do I find out which version and derivative of Ubuntu is right for my hardware in terms of minimal system requirements? 2 answers Just want to check if my computer can run Ubuntu. It is an old IBM ThinkPad, so here are the basic stats I could find: IBM 28832ZU Processor Intel(R) Celeron(R) M processor 1300MHz Processor Speed 1.27 GHz Memory (RAM) 2048 MB Operating System Microsoft Windows XP Professional Operating System Version 5.1.2600 Intel Extreme Graphics 2M And here is some info pulled from the graphics panel NTEL(R) EXTREME GRAPHICS 2 FOR MOBILE REPORT Report Date: 06/28/2013 Report Time[hr:mm:ss]: 17:53:20 Driver Version: 6.14.10.3943 Operating System: Windows NT* 5.1.2600 Service Pack 2 Default Language: English DirectX* Version: 9.0 Physical Memory: 2038 MB Min. Graphics Memory: 8 MB Max. Graphics Memory: 64 MB Graphics Memory in use: 7 MB Processor: x86 family 6 Model 9 Stepping 5 Processor Speed: 1296 MHZ Device Revision: 2 Output Devices Connected to Graphics Accelerator * Active Notebook Displays:1

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• Computer science curriculum for non-CS major?

  - by Daniel

  Hi all, I would like to have some ideas for building up my foundation CS skills. I have started programming computers 10 years ago and have made a pretty good career out of it. However, I cannot stop thinking that the path that brought me here was very particular, and if something goes wrong (e.g. I get laid off) it would be harder to find a job here in the US on the same salary level, OR in a top company. The reason I say that is that I am a self-learner; my degree is not in Computer Science so although I master C/C++/Java, I do not have the formal CS and mathematical background that many other software developers (esp. here in the US) have. When I look at job interview questions from Apple, Google, Amazon, I have the impression that I'd flunk those technical interviews at some point. Don't get me wrong, I know my algorithms and data structures, but when things dive too deeply into the CS realm I am in trouble. What can I do to close the gap? I was thinking about a MSc in CS, but will I even UNDERSTAND what's going on there if I'm not a CS undergrad? Should I go back to basics and get a BSc in CS instead? I always tend to go into self-study mode when I want to learn new stuff, but I have the impression that I will need more formal education in CS if I want to have a shot at working at those kinds of companies. Thank you!

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• How to understand computer science as a whole?

  - by MrCellophane

  I am a college student in Computer Science, I have been studying CS for a long time. But even till today, I still feel so confused about a lot of things. First of all, I have solid foundation in alg, data structure, and OOP, but I don't have a clear understanding of the whole system of the subject. I studied database, alg, data structure, OOP, network, software engineering, OS, and a lot of courses. I know what they are, but I don't know how to connect them together. Is there a way to have a clear understanding of the architecture of the subject? And is there a way to know what technology is used to do what? For example, in interviews, when people ask me alg, data str, Java, OS or any other specific field, I could answer, but when they ask some other very general about the field, I have no idea. Well, I know my question maybe a little bit confusing, but what my situation is I don't even know how to ask a clear question. I don't know my question, it's totally a mess in my head. Is there a way to make it clear?

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• Customized Computer Science Degree - What other field would mesh well with computer science?

  - by sailtheworld

  So here's my situation: I have seven years of experience with web development. I can do PHP, MySQL, OOP, all of that stuff. I would like to make the argument that I have enough technical experience to go out in the real world and get a well-paying, full-time job if I were to drop out right now (I've had a number of job offers recently, and I have already gotten a lot of actual job experience), but I would like to stay in school and get a degree for a number of reasons ranging from the social aspects to the fact that I just want to have a BS in one thing or another as it seems to be important to have one for a lot of jobs, even when it doesn't have anything to do with the job. With that said, it makes little sense for me to major in Computer Science, because that would be like studying everything I already know. I don't want to major in something COMPLETELY different, because that would be contrary to my career goals. I am considering trying to find some interdisciplinary, customized degree of sorts that allows me to combine my current skills with a new education. I'm thinking maybe buisness or even psychology (interface design?). Could I get some ideas for what to major in and tips on who I might talk to? Thanks!

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• How do you structure computer science University notes?

  - by Sai Perchard

  I am completing a year of postgraduate study in CS next semester. I am finishing a law degree this year, and I will use this to briefly explain what I mean when I refer to the 'structure' of University notes. My preferred structure for authoring law notes: Word Two columns 0.5cm margins (top, right, bottom, middle, left) Body text (10pt, regular), 3 levels of headings (14/12/10pt, bold), 3 levels of bulleted lists Color A background for cases Color B background for legislation I find that it's crucial to have a good structure from the outset. My key advice to a law student would be to ensure styles allows cases and legislation to be easily identified from supporting text, and not to include too much detail regarding the facts of cases. More than 3 levels of headings is too deep. More than 3 levels of a bulleted list is too deep. In terms of CS, I am interested in similar advice; for example, any strategies that have been successfully employed regarding structure, and general advice regarding note taking. Has latex proved better than Word? Code would presumably need to be stylistically differentiated, and use a monospaced font - perhaps code could be written in TextMate so that it could be copied to retain syntax highlighting? (Are notes even that useful in a CS degree? I am tempted to simply use a textbook. They are crucial in law.) I understand that different people may employ varying techniques and that people will have personal preferences, however I am interested in what these different techniques are. Update Thank you for the responses so far. To clarify, I am not suggesting that the approach should be comparable to that I employ for law. I could have been clearer. The consensus so far seems to be - just learn it. Structure of notes/notes themselves are not generally relevant. This is what I was alluding to when I said I was just tempted to use a textbook. Re the comment that said textbooks are generally useless - I strongly disagree. Sure, perhaps the recommended textbook is useless. But if I'm going to learn a programming language, I will (1) identify what I believe to be the best textbook, and (2) read it. I was unsure if the combination of theory with code meant that lecture notes may be a more efficient way to study for an exam. I imagine that would depend on the subject. A subject specifically on a programming language, reading a textbook and coding would be my preferred approach. But I was unsure if, given a subject containing substantive theory that may not be covered in a single textbook, people may have preferences regarding note taking and structure.

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• Computer Science Programming Certificate vs. Computer Science Degree?

  - by Jess

  I'm kind of in a tough spot. My current living conditions require that I work a full-time job while attending school. I've attended a UC in the past but had to withdraw my junior year due to financial issues at home. I currently work an entry-level IT corp job but I'm looking to further my salary/skills by getting a degree, or a programming certificate like this one: http://www.lavc.edu/voced1/CSITCertCSP/CSITCertFrameCSP.htm Herein lies the problem. I prefer getting a CS degree from an accredited university but I looked at the schedules for classes and it is impossible to work around my current 40/hr work week. There are random morning classes, with the occasional evening class, but the times get even more construed as I move my way up to the upper divisions. So what I guess I'm trying to get at is, can anyone lay out the pros and cons of obtaining a certificate vs. the degree (besides obvious points like the latter being 100x better)? I'm aware that having a degree is always going to be a better route, but...is the programming certificate useless? Should I not even bother?

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• Inspiring Computer Science College Student Stories?

  - by funk-shun

  After watching "The Social Network", a movie about Mark Zuckerberg and Facebook, I had a productivity spike as it inspired me to learn many different languages and software. That spike has been deteriorating somewhat and I don't feel like watching the movie all over again so I was wondering if anybody had any other similar success stories/links/articles/whatever. Mainly about successes that started for people in college.

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• Diving into a computer science career [closed]

  - by Willis

  Well first I would like to say thank you for taking the time to read my question. I'll give you some background. I graduated two years ago from a local UC in my state with a degree in cognitive psychology and worked in a neuroscience lab. During this time I was exposed to some light Matlab programming and other programming tidbits, but before this I had some basic understanding of programming. My father worked IT for a company when I was younger so I picked up his books and took learned things along the way growing up. Naturally I'm an inquisitive person, constantly learning, love challenges, and have had exposure to some languages. Yet at this point I was fully pursue it as a career and always had this in the back of my head. Where do I start? I'm 25 and feel like I still have time to make a switch. I've immersed myself in the terminal/command prompt to start, but which language do I focus on? I've read the A+ book and planning to take on the exam, then the networking exam, but I want to deal with more programming, development, and troubleshooting. I understand to get involved in open source, but where? I took the next step and got a small IT assistant job, but doesn't really deal with programming, development, just troubling shooting and small network issues. Thank you!

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• Usefull skills from a computer science degree

  - by Tom Squires

  I did my degree in physics and moved later into programming. I have two and a half years experience under my belt and like to think I write good code. I am, however, concerned that not doing a compsci degree has left holes in my knowledge. I would like to fill those up now since I know I want to be doing programming for the rest of my career. What skills/techniques did you learn in your compsci degree that one wouldn't pick up from on-the-job programming?

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• Explicit behavior with checks vs. implicit behavior

  - by Silviu

  I'm not sure how to construct the question but I'm interested to know what do you guys think of the following situations and which one would you prefer. We're working at a client-server application with winforms. And we have a control that has some fields automatically calculated upon filling another field. So we're having a field currency which when filled by the user would determine an automatic filling of another field, maybe more fields. When the user fills the currency field, a Currency object would be retrieved from a cache based on the string introduced by the user. If entered currency is not found in the cache a null reference is returned by the cache object. Further down when asking the application layer to compute the other fields based on the currency, given a null currency a null specific field would be returned. This way the default, implicit behavior is to clear all fields. Which is the expected behavior. What i would call the explicit implementation would be to verify that the Currency object is null in which case the depending fields are cleared explicitly. I think that the latter version is more clear, less error prone and more testable. But it implies a form of redundancy. The former version is not as clear and it implies a certain behavior from the application layer which is not expressed in the tests. Maybe in the lower layer tests but when the need arises to modify the lower layers, so that given a null currency something else should be returned, i don't think a test that says just that without a motivation is going to be an impediment for introducing a bug in upper layers. What do you guys think?

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• How to spot undefined behavior

  - by BlueRaja - Danny Pflughoeft

  Is there any way to know if you program has undefined behavior in C++ (or even C), short of memorizing the entire spec? The reason I ask is that I've noticed a lot of cases of programs working in debug but not release being due to undefined behavior. It would be nice if there were a tool to at least help spot UB, so we know there's the potential for problems.

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• Computer freezes, wireless network icon disappears

  - by Heidi

  As you can see I have two problems. I have a Toshiba Tecra A3 computer. It is 5-6 years old and it is connected to a D-link router. For a period now it has not been working correctly. The computer freezes either when i try turning it on or when I have been using the computer for a short period of time. The times the computer works normally I have a problem with a disappearing wireless network icon, and so I have no internet. Can this be fixed or do I have to buy a new computer? I only use the computer for internet surfing and easy tasks like word etc, so I would like to keep it as long as possible.

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• Data transfer to my own computer from a website host by the same computer

  - by gunbuster363

  Hi all, I have a question about using a web site host in my computer, say Computer A, using any web server hosting application e.g : apache. I connect to my website in my very same computer A, and request to download a file of size 1Mb, in otherwords, I am connecting to my own computer and want to download a file in my computer. In addition, my internet access is bound by a proxy server in a way of gateway. The questions are - does the file transfer really exist? Or is it a local file copying between 2 location? Will my data packet go through the proxy, to the internet, and go back to the proxy and return to me? Thanks everyone who are watching this question.

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• Can communications & computer engineer work as a programmer? [closed]

  - by Egy Prot

  I'm studying now communications & computer engineering. The professor told me that: Engineers have much hiring priority than Computer Scientists. It's good I've the ability to apply for the faculty of engineering. This'll help me to achieve my ambition to be a programmer. We'll study computer science. While I was browsing, I only saw computer science, computer science... etc. Courses vary from a faculty to another. Can he be right? If he's right, will employers prefer Computer Scientists or Engineers?

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• Instruction vs data cache usage

  - by Nick Rosencrantz

  Say I've got a cache memory where instruction and data have different cache memories ("Harvard architecture"). Which cache, instruction or data, is used most often? I mean "most often" as in time, not amount of data since data memory might be used "more" in terms of amount of data while instruction cache might be used "more often" especially depending on the program. Are there different answers a) in general and b) for a specific program?

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• Is it worth becoming a programmer?

  - by D. Higueras

  Hi everybody. I'm a first year student in CS and I absolutely love programming. Many people have told me it isn't so good once you start working. Some things like bringing your work home(thinking about how to solve problems), working many hours when the timeline reaches an end an so on. I've heard being a system administrator is a lot less stressing job, since you don't have to worry about it at home. So my questions are(for experienced programmers): Is it worth becoming a programmer? Does your job satisfy you enough to overcome these problems? Thanks in advance.

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• Computer hobby and repairs

  - by John

  I have been a fulltime student recently working on graduate work to complete a graduate degree. While continuing my studies I have maintained my computer hobby. However, recently my computer hobby has been threatening to turn into a full-fledged side business. Because I am starting to have people come to me for computer help who I have never met before (who generally heard word-of-mouth from other people whose computers I looked at) I am seriously considering putting my conditions for working on a computer into writing (for potential damage control and perhaps liability reasons). Are there any standards for this that I should reference? Should responsibility be waived for times when the computer is left in my care or any time I look at a machine? Any advice you can provide here would be appreciated. What other lessons have you learned that I should be aware of in relation to helping people while continuing my studies as a hobby? Thank you in advance.

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• change computer desktop icon in Windows 2008 R2 to display computer name

  - by Mouffette

  In Windows 2003 I was able to change the registry key as follows to display the actualy computer name on the desktop using the Computer Desktop Icon. System Key: [HKEY_CLASSES_ROOT\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}] Change "LocalizedString" value to %COMPUTERNAME% I'm getting access denied messages using regedit for this key and I'm unable to give full rights to this specific key as well as administrator. Does anyone have a better solution for displaying the computer name on the desktop? Thanks.

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• Wake up my company computer from a home computer

  - by Darcy

  I would like to learn if it is possible for me to send a packet (a magical one) from another computer to my computer. I am interested in waking up my computer at work from the one I am using at home. That is I would like to power it on at 7:00am by sending it a wake-on packet from the home computer. I have no idea how to carry out this seemingly trivial task, I hope someone could offer some basic ideas for me start. Thank you so much in advance.

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• Can I use a specific model from within a behavior in CakePHP?

  - by Paul Willy

  I'm trying to write a behavior that will give my models access to a simple workflow engine I've devised. The workflow engine itself works as a CakePHP model, with workflow data stored in the database just as any other model data is stored. Basically what I want to do is have the behavior use the workflow model whenever an action is called on the base model. For example, if the edit() action is executed for Posts, then the Post (with the behavior attached) will trigger the workflow behavior with its own model name, action, and id as arguments (e.g. [Post, edit, 1]). Then the behavior will invoke the functionality of the Workflow model, which has a record for what to do when edit is run on Posts (e.g. send e-mail to users who are subscribed to that post) and will carry that out. My question is, what is the proper way to invoke model/controller methods from within the behavior? The model to be used from within the behavior will always be Workflow, but the behavior should be usable from basically any model (aside from Workflow itself). I know I could run SQL queries directly from the behavior, but of course this is not the Cake way :-) Or, am I going about this in the wrong way? I want to store a certain amount of logic in the database so that it is easily configurable by different users, and not have endless configuration checks within the model/controller logic itself so that workflow steps can be easily added/changed/removed in the future.

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• Javascript undefined behavior with string.replace

  - by epochwolf

  I've been messing around with string.replace and I noticed something very odd with Webkit and Firebug's javascript consoles. I can repeat this behavior in a blank browser window. (Look at the first and last lines) >>> "/literature?page=".replace(/page=/i, "page=2") "/literature?page=" >>> "/literature?page=".replace("page=", "page=2") "/literature?page=2" >>> "/literature?page=".replace(/page=/, "page=2") "/literature?page=2" >>> "/literature?page=".replace(/page=/i, "page=2") "/literature?page=2" Just so nobody thinks I mistyped something, here are screenshots. Firebug (3.0.14) Webkit (Latest nightly as of this post's creation.)

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• Learn Behavior-Driven Development

  - by Ben Griswold

  In this presentation, I provided a brief introduction into TDD and talked about the confusion and misconceptions around the discipline. I, of course, shared a bit about Dan North, the father of BDD and touched upon some crazy hypothesis dreamed up by Sapir and Whorf. I then gave a Behavior Driven Development overview (my impressions of the implementation and lifecycle) and then touched upon available tools, how to get started and I threw in a number of reference and reading materials which you will find below. As an added bonus, I demonstrated how easy it is to include/exclude hyphens and alter the spelling of “behavior” at will.   Introducing BDD, Dan North Oredev 2007 – Behaviour-Driven Development, Dan North Behavior-Driven Development, Scott Bellware Behavior Driven Development, Wikipedia BDD Wiki A New Look at Test-Driven Development, Dave Astels Behavior Driven Development – An Evolution in Testing, Bob Cotton The Truth about BDD, Uncle Bob Martin Language and Thought, Wikipedia Sapir-Whorf Hypothesis, Wikipedia What’s in a Story?, Dan North

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