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• Information Modeling

  - by Betamoo

  The sensor module in my project consists of a rotating camera, that collects noisy information about moving objects in the surrounding environment. The information consists of distance, angle and relative change of the moving objects.. The limiting view range of the camera makes it essential to rotate the camera periodically to update environment information... I was looking for algorithms / ways to model these information, in order to be able to guess / predict / learn motion properties of these object.. My current proposed idea is to store last n snapshots of each object in a queue. I take weighted average of positions and velocities of moving object, but I think it is a poor method... Can you state some titles that suit this case? Thanks

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• 56.6 Modem with CallerID

  - by Fuod

  Does anyone still know anything about the 56.6 modems? I'm looking for one that is easy to access via C#/VB.Net, has Caller ID and is either low-profile or USB. Also that neat little feature that lets the modem block the call from the phone (pass-through) until it has received the CallerID info would be really nice! Obviously I could just go to Best Buy and get what they have but I have no way of knowing how friendly it would be to write code for and I don't want to make multiple trips returning/exchanging etc. I'm not going to be doing anything with voice or voice mail, just recording the number from CallerID. Thanks!

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• What is the best appliance you've used?

  - by phuzion

  Post your favorite appliances or "all-in-one" programs. Whether it runs in a virtual machine, or on its own hardware, it all goes. My submission is Untangle. It's an open source network gateway (their term). Essentially, it can run a plethora of things that you may otherwise end up buying another appliance for: Web filtering logging mail spam filtering phishing monitor spyware blocking VPN You name it, it's all there. Best of all, it's mostly free. A few appliances have annual costs due to inherent licensing or subscription costs. If you are looking for a new network perimeter device, definitely check it out. The underlying OS doesn't matter, because it's the application we want to praise, not the OS beneath it.

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• BST Level Traversal

  - by Dalton Conley

  Ok, so I'm trying to do a level order traversal of a binary search tree and its not working. The code below makes sense to me, but that is probably because I've been looking at it forever and I've convinced myself that it should work. void BST<T>::levelByLevel(ostream &out) { Queue<BinNodePointer> q; BinNodePointer subtreeRoot; if(myRoot == NULL) return; q.enqueue(myRoot); while(!q.empty()) { subtreeRoot = q.front(); out << subtreeRoot->data << " "; q.dequeue(); if(subtreeRoot->left != NULL) q.enqueue(subtreeRoot->left); if(subtreeRoot->right != NULL) q.enqueue(subtreeRoot->right); } } Maybe you guys could point out what I'm doing wrong because, although I understand the concept of a binary search tree, I'm not 100% on all the ins and outs.

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• /etc/hosts file for a multi-homed, multi-domain machine?

  - by threecheeseopera

  I have a server (debian) with two network interfaces that I would like to host multiple services and domains on; it is not entirely clear to me how the hosts file should be set up. Example: eth0, bound to WAN interface 1.2.3.4: mail.example.com www.example.com eth0:1, bound to WAN interface 1.2.3.5: www.other-domain.com eth1, bound to LAN 192.168.1.123: some-clever-hostname What should my hosts file look like? (including localhost,localhost.localdomain, etc.) Should I use DNS for some of these entries? Which ones? Thanks!

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• Active MQ showing more than one (ghost) consumer

  - by Shoey

  We have a system that uses ActiveMQ (Queues) - and have exactly one producer and one consumer (implemented as a Windows Service in .NET). Over the weekend, the infrastructure team had a reboot of the servers on the network, and from then on we noticed that there are more than one ghost consumer appearing that listens to the queue and we also suspect reads and deletes the messages. My questions are: is there any way from the Active MQ management console to find out what the consumers are (hostnames, etc). and Are there any scenarios in which inadvertent consumers get 'created'? For instance, there were suggestions about the active MQ journal folders getting corrupted after a reboot, or there is another suggestion that another machine with Active MQ broker automatically makes itself a consumer of all the queues on the main/live active mq server.

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• Remote Linux system via Windows 7

  - by kaila

  I have a dual boot with Windows 7 and Fedora. Though I can long into both without any problems, I am trying to log in to the linux account via the Windows account. Is that possible? Or, is it possible to access my university's linux server via telnet from home? I did so and got an error, with cold not connect to port 23 message. Also, since most of my mail accounts are on Windows, the passwords to which I have forgotten, I would prefer working on a ;remote' connection.

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• Dedicated server given, how to start?

  - by eduardito

  Hello, I've been given a dedicated server. Unfortunately, I have no idea what to do / how to manage it. I have background in many fields on Computer Science but never got to focus on networking, server management, etc. What I'm asking is for recommended books, Basically, I would like to be able to be proficient and understand well how to manage domain names, zones, setting up mail servers, being able to install easily any web server, and such. Everything needed for proper server management through the shell. I will probably stick with Parallels, or Cpanel for a bit. But I dislike those, especially how it add a lot of intruding user accounts and configs on the file system. Thank you

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• Mysql showing some high spikes

  - by user111196

  We one mysql server suddenly the access to it becomes slow of out sudden. So I read some place they said maybe due to var size is it? I am not too sure any idea how to check the root cause of it. The cpu is like nearly 150%. Any indication on it. I have tried this so far. du -sh * 4.0K account 67M cache 4.0K cvs 16K db 8.0K empty 4.0K games 4.0K gdm 148G lib 4.0K local 16K lock 624M log 0 mail 4.0K nis 4.0K opt 4.0K preserve 400K run 298M spool 4.0K tmp 359M www 12K yp

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• Alternative to cPanel (For Email, ect)

  - by Dboy1612

  I'm currently setting up a VPS for the first time. Standard that I've ever worked with before on shared hosting was cPanel, but as the majority of my work I plan on doing from now on will be using NodeJS and Python/Flask, I'd like to avoid needing to install Apache/MySQL/PHP. What would be my best bet to help manage a mail server other than cPanel? Or even other specific server settings that may come in handy later? Plan on using Ubuntu if that counts for anything.

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• Central Storage for windows user accounts homedirs .. hardware/software needed?

  - by mtkoan

  We have ~120+ users in our network, and are endeavoring to centralize logon authentication and home directory storage server-side. Most of the users are Windows 2000/XP machines, and a few running Mac OS X. Ideally the solution will be open-source-- can this all be managed from a Linux server running LDAP and Samba? Or would a hacked-NAS Box with a FreeNAS or similar suffice? Or is Micro$oft's Active Directory really the preference here. Is it viable to store PST files on this server for users to read from and write to? They are very large ~1.5gb. We have no mail server (or money) capable of Exchange or IMAP, only an old POP3. What kind of hardware horsepower and network architecture should we have for this kind of thing?

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• one email have multiple open id , unable to retrive specific open id password?

  - by superUser

  I have multiple OPENID accouts refrencing same email address, now i forget one of my accout's password. and when i tried to recover my password then only one openid accout link sent to my mail address whereas i need another openid password reset link what i have to do?? although i m able to login through gmail, but i want to login through openid. i have mailed already? but no satisfactory answer?? how do i collect all open ID password reset link referencing same email address??

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• Rails: How can I log all requests which take more than 4s to execute?

  - by Fedyashev Nikita

  I have a web app hosted in a cloud environment which can be expanded to multiple web-nodes to serve higher load. What I need to do is to catch this situation when we get more and more HTTP requests (assets are stored remotely). How can I do that? The problem I see from this point of view is that if we have more requests than mongrel cluster can handle then the queue will grow. And in our Rails app we can only count only after mongrel will receive the request from balancer.. Any recommendations?

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• php convert images and upload to amazon s3

  - by faraklit

  I am looking for a best practice while uploading images to amazon s3 server and serving from there. We need four different sizes of an image. So just after image upload we convert the image and scale in 4 different widths and heights. And then we send them to the amazon s3 using official php api. // ... // image conversions, bucket setting, s3 initialization etc. $sizes= array("", "48", "64", "128"); foreach($sizes as $size) { $filename = $upload_path.$dest_file.$size.$ext; $s3->batch()->create_object($bucket, , array( 'fileUpload' => $filename, 'acl' => AmazonS3::ACL_PUBLIC, )); } But for a 1M image the client sometimes wait up to 30 seconds which is a very long time. Instead of sending images immediately to S3, it may be better to add them to a job queue. But the user should see the uploaded image immediately.

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• Need advice on cron job'ing a very large process

  - by Arms

  I have a PHP script that grabs data from an external service and saves data to my database. I need this script to run once every minute for every user in the system (of which I expect to be thousands). My question is, what's the most efficient way to run this per user, per minute? At first I thought I would have a function that grabs all the user Ids from my database, iterate over the ids and perform the task for each one, but I think that as the number of users grow, this will take longer, and no longer fall within 1 minute intervals. Perhaps I should queue the user Ids, and perform the task individually for each one? In which case, I'm actually unsure of how to proceed. Thanks in advance for any advice.

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• How can I access a shared Exchange mailbox with IMAP (over telnet)?

  - by gauteh

  I have an Mailbox which multiple users have access to, it works fine for me and I can add it in Outlook as an additional mailbox to my account and list all its content. I can access my personal mailbox using IMAP, I'm testing it by just telneting in and LIST'ing it. The problem is that another user trying to access it is having problems accessing it through IMAP; and I want to test if I can access the shared mailbox with my account - how can I do that in terms of IMAP commands? What I am doing now is: telnet mail.server 01 LOGIN user pass 02 LIST "" * 03 LOGOUT Edit: If there is another way to test this, that is an equally good answer.

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• background music stops after 3/4 runs in iphone app

  - by amy

  I am playing sounds in loop in my app. So it should continue playing through out the app. but sometimes it stops after playing sound for 3/4 times.I don't understand whats happening. I am using audio-toolbox framework for playing sound. creating audio queue and then playing sounds in loop. I am also playing sound from ipod library using mediaplayer. Same thing happening with song from ipod. I have set [musicPlayer setRepeatMode: MPMusicRepeatModeOne]; but still it stops after 3/4 times.

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• How is push()ing and pop()ping defined?

  - by Helper Method

  I know how the push() and pop() methods in a typical implementation of a Queue/Linked List work but what I do want to know is what you actually define as a push or a pop? When can you name a method push()/pop()? What makes the insert()/add() method in a typical Tree implementation not a push()? My understanding is that push()ing means putting something to a position some special pointer is pointing to, and pop()ping an element means putting some object away some pointer is pointing to, but it doesn't seem to be clearly defined. Or does the naming matter at all?

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• How to setup dns to redirect app.example.com to another ip?

  - by AZ.

  I have a site www.example.com running on a hosting company. Now I want to create a separate web app on my VPS and let it accessible via app.example.com How can I set the DNS to redirect app.example.com to my VPS' ip address? CNAME or A Record? Also, If I want to do a mail server on my VPS too, how to setup the DNS? EDIT: Existing site: www.example.com Location: some hosting company that I don't control. It's running PHP with nginx I guess (or aphache) New site (that I'm working on): app.example.com Location: my VPS, it has an IP address, the VPS is running nodejs. It can run along with nginx but currently it's not. I want the existing website continue working (as customer visit www.example.com) and I want customer to visit app.example.com for some new features. The two websites are NOT on the same server and not using the same IP address.

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• Is there a proper way to clear logs?

  - by John H.

  I was wondering if there was a proper way to clear logs in general? I'm new to Ubuntu and I'm trying to set up Postfix. The log in question is /var/log/mail.log. I was wondering if there was a correct way to clear it, rather than me going in it and deleting all the lines and saving it. I find that sometimes errors don't get written to it immediately after I clear the log and save it. Side note: I'm having trouble setting up Postfix and am trying to make it easier for me to read the logs hoping it can help me out, instead of having to scroll all the way down.

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• any way to simplify this with a form of dynamic class instantiation?

  - by gnychis

  I have several child classes that extend a parent class, forced to have a uniform constructor. I have a queue which keeps a list of these classes, which must extend MergeHeuristic. The code that I currently have looks like the following: Class<? extends MergeHeuristic> heuristicRequest = _heuristicQueue.pop(); MergeHeuristic heuristic = null; if(heuristicRequest == AdjacentMACs.class) heuristic = new AdjacentMACs(_parent); if(heuristicRequest == SimilarInterfaceNames.class) heuristic = new SimilarInterfaceNames(_parent); if(heuristicRequest == SameMAC.class) heuristic = new SameMAC(_parent); Is there any way to simplify that to dynamically instantiate the class, something along the lines of: heuristic = new heuristicRequest.somethingSpecial(); That would flatten that block of if statements.

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• How should I mock out my data connectivity

  - by BobTheBuilder

  I'm trying to unit test my Data Access Layer and I'm in the process of trying to mock my data connectivity to unit test my DAL and I'm coming unstuck trying to mock out the creation of the commands. I thought about using a queue of IDbParameters for the creation of the parameters, but the unit tests then require that the parameters are configured in the right order. I'm using MOQ and having looked around for some documentation to walk me through this, I'm finding lots of recommendation not to do this, but to write a wrapper for the connection, but it's my contention that my DAL is supposed to be the wrapper for my database and I don't feel I should be writing wrappers... if I do, how do I unit test the connectivity to the database for my wrapper? By writing another wrapper? It seems like it's turtles all the way down. So does anyone have any recommendations or tutorials regarding this particular area of unit testing/mocking?

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• Cascading MVC controllers with CatchAll Routes

  - by Richard

  Hi, I have an MVC app which has its routes defined with the final route being a catch all route to a "PageController" for a database driven collection of pages. What I want to achieve is to be able to plugin to the app a second controller to the catch all route which the first controller passes on to if it does not find the url recieved in the database. Effectively I want to queue up controllers with catch all actions: public ActionResult PageCatchall(string url) { var page = repository.Get<Page>(string url); if (page != null) { // Handle the request return View(page) } // Otherwise pass to a new controller ???? } Anyone have any good ideas as to how to solve this? I have tried RedirectToAction but that requires that the next controller has a different route to the action. I have tried ActionInvoker but this failed to work the way I did it.

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• Time in "Upload Received"

  - by rpeck1682

  I uploaded an app to itunes connect yesterday afternoon. It has been in the "Upload Received" stage ever since then. I uploaded a different app today, it was in that stage for only five minutes. This is the first time I've submitted since the new, more detailed status updates were present. I'm just wondering if the app sitting there in that state for so long seems like something to be concerned about. I'm guessing by staying in that state that it isn't being put on the review queue. Anyways, has anyone else had a similar experience?

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• Server 2008 Hyper-V User Accounts to access each other

  - by asn1981

  Hi, I have a windows server 2008 r2 with 3 hyper-v vm's IIS server Sql server 3 - Mail server I'm new to networking/server configuration. I have created a Virtual Network and can see each of the 3 VMs as well as the host on the network. I can connect from each VM to the host using the admin account. However, what would be the best (secure) way to create connections/accounts between the VMs, presumabely this shouldn't be done with an admin account but one with lesser priveledges. For example, to be able to access the SQL Server VM from the IIS server VM?

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