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  • Have you dealt with space hardening?

    - by Tim Post
    I am very eager to study best practices when it comes to space hardening. For instance, I've read (though I can't find the article any longer) that some core parts of the Mars rovers did not use dynamic memory allocation, in fact it was forbidden. I've also read that old fashioned core memory may be preferable in space. I was looking at some of the projects associated with the Google Lunar Challenge and wondering what it would feel like to get code on the moon, or even just into space. I know that space hardened boards offer some sanity in such a harsh environment, however I'm wondering (as a C programmer) how I would need to adjust my thinking and code if I was writing something that would run in space? I think the next few years might show more growth in private space companies, I'd really like to at least be somewhat knowledgeable regarding best practices. Can anyone recommend some books, offer links to papers on the topic or (gasp) even a simulator that shows you what happens to a program if radiation, cold or heat bombards a board that sustained damage to its insulation? I think the goal is keeping humans inside of a space craft (as far as fixing or swapping stuff) and avoiding missions to fix things. Furthermore, if the board maintains some critical system, early warnings seem paramount.

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  • JSON-RPC and Json-rpc service discovery specifications

    - by Artyom
    Hello, I'm going to implement JSON-PRC web service. I need specifications for this. So far I had found only one resource that can be called as real specifications: JSON-RPC 1.0 http://json-rpc.org/wiki/specification Proposal of JSON-PRC 2.0: http://groups.google.com/group/json-rpc/web/json-rpc-2-0 (why is it on google groups?) However I've seen that JavaScript frameworks like Dojo actively use JSON-RPC SMD Service Mapping Description proposal But it requires JSON Schema specifications, but it redirects to incorrect URL as reference. So far I had found following: http://tools.ietf.org/html/draft-zyp-json-schema-02 And it is still draft... Can anybody point me to some actual specifications... At least something official updated? Because it looks like that implementing JSON-RPC 1.0 as is may be not enough, at least for frameworks like Dojo. Or am I wrong? Questions: Would implementation of JSON-RPC 1.0 specifications be enough to provide JSON-RPC service for most of modern clients, and how many clients there (if at-all) that actually support beyond JSON-RPC 1.0 capabilities (SMD, Schema, 2.0)? Because it looks like that JSON-RPC 1.0 is only one that has official specifications (and not draft) If I should implement SMD, or it is recommended can somebody point to official, most recent specifications of Json Schema and Service Mapping Description or links I found are really "the specifications?" Are JSON-RPC 2.0, SMD and JSON-Schema drafts stable enough to implement them? Note: do not suggest existing JSON-RPC service implementations. Anybody?

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  • Visual Studio 2010 and discovery of advantage server error

    - by Tina Nipe
    I installed VS 2010 on a Windows 7 64 bit machine. When I try and connect to an advantage database through the server explorer using the Advanatage OLEDB driver I get a cannot discover advantage database server error. I can connect to the database using the ARC just fine. I was able to connect in VS 2008 just fine. Any ideas on why I can't connect in VS 2010?

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  • Project roles discovery

    - by Lirik
    I have a school project in which we're going to write a financial engine prototype by a group of 4 people. Most of us have never met each other before, so I'm trying to create a questionnaire to help us find the appropriate roles for each team-member. We have the following responsibilities: Database design Programming User interface design Training Documentation / technical writing Network design Project management Business analysis Testing And we have the following roles: Project Manager Developer Tester Business Analyst Our group has people with various experience: a full-time graduate student, an associate director at the CME (Chicago Mercantile Exchange), full-time professionals, etc. Do any of you know of any tools that would help build a questionnaire or do you have a reference to an online questionnaire that can help us identify the most suitable role(s) for each team member?

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  • Add Web Reference prompts for credentials with "Discovery Credential" dialog but won't accept valid

    - by Eden
    I'm attempting to add a web reference to my ASP.Net 3.0 project. This is a reference to the SQL Server Reporting Services web service. I have verified the service is up and running, but when I try to add the web reference in my project, I am prompted for my credentials, which I enter, and then prompted again and again and again. I have to hit cancel to stop the vicious cycle. When I do that the service definition comes up in the window, but the "Add Reference" button is disabled so I can't add the reference to my project. I have limited knowledge of SQL Reporting Services configurations. If anyone knows how to resolve this problem I'd really appreicate it.

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  • Text viewing in a delimited space

    - by Maurizio Reginelli
    I need to visualize a text into a delimited space. If I add a simple TextBlock I have a problem: when the text is longer than the available space, it is cropped at the end. I tried to insert the TextBlock inside a Viewbox: this solution works for a text longer than the available space, but increase the size of the text when it is shorter. Is there a way to reduce the size of the text only when it is longer than the available space?

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  • Can't create new Volume on Unallocated Space

    - by natediggs
    I installed Windows Server 2008 R2 on a Dell server that has one volume that is a 6 TB RAID 5 array. I created a 120GB install volume and I'm now trying to create a 5 TB data volume. For what ever reason Windows will not allow me to create a new volume out of all of the unalocated space. Windows will allow me to create a new volume out of one 2TB block of unallocated space but not the remaining 3.5 TB block. Tried to post a screen shot but I was blocked. If I right click on the 1949.85 GB block of space there is the option to create a new volume. If I click on the 3539.5 GB block of space that option is grayed out. If I go into diskpart and try to create a new partition, diskpart says that there is only 1949GBs free on the volume. I know this process works because I did the exact same thing on another server that we have that is the exact same hardware configuration on which I used the exact same Server 2008 R2 install image. Any help would be greatly appreciated. Nate

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  • MySQL: LOAD DATA reclaim disk space after delete

    - by Michael
    I have a DB schema composed of MYISAM tables, i am interested to delete old records from time to time from some of the tables. I know that delete does not reclaim the memory space, but as i found in a description of DELETE command, inserts may reuse the space deleted In MyISAM tables, deleted rows are maintained in a linked list and subsequent INSERT operations reuse old row positions. I am interested if LOAD DATA command also reuses the deleted space? UPDATE I am also interested how the index space reclaimed?

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  • RightFax 9.3 Available Disk Space?

    - by dkirk
    We are currently running RightFax 9.3 as our fax server. I was just in the RightFax Enterprise Fax Manager resolving another problem and noticed 2 little red exclamation marks in the lower left hand pane. I have one beside "Available disk space for fax images" and one beside "Available disk space for fax database". Both are labeled with 5%? What is this? How can this be resolved? I have plenty of physical storage left on the server drives so I am curious as to which space it is referring to??

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  • Shared Development Space

    - by PatrickWalker
    Currently the company I work in gives each developer their own development virtual machine. On this machine (Windows 7) they install the entire stack of the product (minus database) this stack is normally spread amongst multiple machines of differing OS (although moving towards windows 2008 and 2008r2) So when a developer has a new project they are likely to be updating only a small piece of their stack and as such the rest of it can become out of date with the latest production code. The isolation from others means some issues won't be found until the code goes into shared test environments/production. I'm suggesting a move from functional testing on these isolated machines to plugging machines into a shared environment. The goal being to move towards a deployment thats closer to production in mechanism and server type. Developers would still make code changes on their Win7 vm and run unit/component testing locally but for functionally testing they would leverage a shared enviornment. Does anyone else use a shared development environment like this? Are there many reasons against this sort of sandbox environment? The biggest drawback is a move away from only checking in code when you've done local functional testing to checking in after static testing. I'm hoping an intelligent git branching strategy can take care of this for us.

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  • Curiosity’s Self Portrait

    - by Jason Fitzpatrick
    One space enthusiast couldn’t wait for NASA to release an official on-Mars portrait of the rover Curiosity, so he took 55 partial self-portraits sent back by the rover and stitched them all together into the first complete on-planet photo we’ve seen of Curiosity. Courtesy of Stuart Atkinson, the photos are stitched together from images collected over the initial portion of Curiosity’s mission. Hit up the link below to check out the full size image. Curiosity [via Wired] 6 Start Menu Replacements for Windows 8 What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives? How To Log Into The Desktop, Add a Start Menu, and Disable Hot Corners in Windows 8

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  • Add unallocated space to lvm

    - by Newbie
    I shrunk my windows partition and now have 10 GB of unallocated space that I now want to use to grow my / partition which is an ext4 in an lvm. I'm running Fedora 12. I ran system-config-lvm but the "Initialize Entry" button is greyed out. The unallocated space is not adjacent to the lvm but I cannot move the partitions in GParted like I was able to with ext3 in the past. I cannot create a new partition either as it says it cannot have more than 4 primary partitions. I don't see any option to create an extended partition. So my question is, how do I add that unallocated space to the lvm so I can grow the size of the / partition? I don't want to reinstall Fedora.

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  • Add unallocated space to lvm

    - by Newbie
    I shrunk my windows partition and now have 10 GB of unallocated space that I now want to use to grow my / partition which is an ext4 in an lvm. I'm running Fedora 12. I ran system-config-lvm but the "Initialize Entry" button is greyed out. The unallocated space is not adjacent to the lvm but I cannot move the partitions in GParted like I was able to with ext3 in the past. I cannot create a new partition either as it says it cannot have more than 4 primary partitions. I don't see any option to create an extended partition. So my question is, how do I add that unallocated space to the lvm so I can grow the size of the / partition? I don't want to reinstall Fedora.

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  • 301 redirect for a page with a space in it

    - by Outerbridge Mike
    I have some pages from a client's old template-based site which have spaces in them. For example, one of the pages looks like this: example.com/page.php?domain_name=example.com&viewpage=Gallery %26 News I'm thinking that the correct way to do an htaccess 301 redirect is to include something like this: Redirect 301 /page.php?domain_name=example.com&viewpage=Gallery%20%26%20News http://www.example.com/gallery/ where the new page is: example.com/gallery Is this correct?

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  • Windows 2008 R2 Server Core Disk Space Requirements/Recomendations

    - by Richard West
    I'm in the preparation stage to roll out a few Windows 2008 R2 Server Core in my VMware ESX environment. In looking over the documentation it looks like Server Core can operate in a little as 6.5 GB of hard drive space. Less disk space required. A Server Core installation requires only about 3.5 gigabytes (GB) of disk space to install and approximately 3 GB for operations after the installation. I am curious as to anyone’s real world experience and recommendations with regard to this requirement. Is it realistic? A little bit about our environment: Less than 25 users, and around 75 computers/servers in our current AD system. These systems will be responsible for normal AD operations and print servers for 5 printers - nothing to big here.

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  • EC2 out of space on root disk, moving it to ephemeral

    - by Joseph Misiti
    I am spawning a few test servers on ec2 that happen to be m1.larges. I am using these test servers for load balancin testing. Anyways, most of the servers I have used before have been backed by EBS, but these instances (ubuntu 11.04) obviously come with a lot of ephemeral space located @ /mnt. What I noticed that is happening is I am running on space on the root disk. I am trying out this tutorial http://www.turnkeylinux.org/docs/using-instance-storage moving my /home + /usr directories to /mnt and then remounting them. This works except it does not survive a reboot. Am I missing something here or is this tutorial not completely correct. How do I make space on my / drive so I can do stuff and survive re-boots.

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  • Rotate/Translate object in local space

    - by Mathias Hölzl
    I am just trying to create a movementcontroller class for game entities. These class should transform the entity affected by the mouse and keyboard input. I am able to calculate the changed rotation and the new globalPosition. Then I multiply: newGlobalMatrix = changedRotationMatrix * oldGlobalMatrix; newGlobalMatrix = MatrixSetPosition(newPosition); The problem is that the object rotates around the global axis and not around the local axis. I use XNAMath for the matrix calculation.

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  • Eculidean space and vector magnitude

    - by Starkers
    Below we have distances from the origin calculated in two different ways, giving the Euclidean distance, the Manhattan distance and the Chebyshev distance. Euclidean distance is what we use to calculate the magnitude of vectors in 2D/3D games, and that makes sense to me: Let's say we have a vector that gives us the range a spaceship with limited fuel can travel. If we calculated this with Manhattan metric, our ship could travel a distance of X if it were travelling horizontally or vertically, however the second it attempted to travel diagonally it could only tavel X/2! So like I say, Euclidean distance does make sense. However, I still don't quite get how we calculate 'real' distances from the vector's magnitude. Here are two points, purple at (2,2) and green at (3,3). We can take two points away from each other to derive a vector. Let's create a vector to describe the magnitude and direction of purple from green: |d| = purple - green |d| = (purple.x, purple.y) - (green.x, green.y) |d| = (2, 2) - (3, 3) |d| = <-1,-1> Let's derive the magnitude of the vector via Pythagoras to get a Euclidean measurement: euc_magnitude = sqrt((x*x)+(y*y)) euc_magnitude = sqrt((-1*-1)+(-1*-1)) euc_magnitude = sqrt((1)+(1)) euc_magnitude = sqrt(2) euc_magnitude = 1.41 Now, if the answer had been 1, that would make sense to me, because 1 unit (in the direction described by the vector) from the green is bang on the purple. But it's not. It's 1.41. 1.41 units is the direction described, to me at least, makes us overshoot the purple by almost half a unit: So what do we do to the magnitude to allow us to calculate real distances on our point graph? Worth noting I'm a beginner just working my way through theory. Haven't programmed a game in my life!

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  • Windows XP SP3 TCP/IP No buffer space available

    - by Natalia
    I have the exactly same problem as here: Windows XP TCP/IP No buffer space available On Windows XP Pro, SP3 if one does an experiment where one tries to open TCP/IP sockets in a loop (bascially, listen port 7000, listen port 7001, etc.) After approx 649 open sockets, one will start getting errors: No buffer space available (maximum connections reached?) I've tried to edit the registry as described here http://smallvoid.com/article/winnt-tcpip-max-limit.html I set MaxUserPort = 65534 and MaxFreeTcbs = 2000, but it didn't help. What else can I do? I need 1000 server sockets. Here is the error stack: 05.04.2012 10:23:57 java.net.SocketException: No buffer space available (maximum connections reached?): listen at sun.nio.ch.ServerSocketChannelImpl.listen(Native Method) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:127) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:52) at channelserver.NIOAppServer.initSelector(NIOAppServer.java:40) at channelserver.NIOAppServer.(NIOAppServer.java:27) at channelserver.NIOServer.main(NIOServer.java:433) at channelserver.NIOServer.main(NIOServer.java:438)

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  • SQL Server v.Next (Denali) : Metadata enhancements

    - by AaronBertrand
    In my previous job, we had several cases where schema changes or incorrect developer assumptions in the middle tier or application logic would lead to type mismatches. We would have a stored procedure that returns a BIT column, but then change the procedure to have something like CASE WHEN <condition> THEN 1 ELSE 0 END. In this case SQL Server would return an INT as a catch-all, and if .NET was expecting a boolean, BOOM. Wouldn't it be nice if the application could check the result set of the...(read more)

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  • bashrc script not accepting space in directory name

    - by faizal
    I have added a variable at the end of my ~/.basrc file : export xyz = /home/faizal/DEV/ADT workspace/xyz But if i open a new terminal, i get the error : bash: export: 'workspace/xyz': not a valid identifier So i try a variety of alternatives : export xyz=/home/faizal/DEV/ADT\ workspace/xyz export xyz="/home/faizal/DEV/ADT workspace/xyz" export xyz="/home/faizal/DEV/ADT\ workspace/xyz" export xyz='/home/faizal/DEV/ADT workspace/xyz' export xyz='/home/faizal/DEV/ADT\ workspace/xyz' They all give me the error when i try cd $xyz: bash: cd: /home/faizal/DEV/ADT: No such file or directory What am i doing wrong?

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  • Hidden characters inserted after pipe (|) followed by a space

    - by nifty
    Very often, on my Mac, when I use the pipe (|) character followed by a space character, an invincible character will be inserted in between. This is especially annoying when using the terminal, as it makes commands invalid. If I type the following in iterm2, I often get the following: ls | cat zsh: command not found:  cat If I hit the up-arrow-key to get my previous command, and then remove and reinsert the space between | and cat, the command will work. When I copy paste the working and non working commands into a file, like this: non-working: ls | cat working: ls | cat and open it in Hex Fiend it shows the following: non-working: ls |¬†cat working: ls | cat I've also experienced the same kind of issue in SublimeText2 using the square brackets ([]) followed by a space. So I don't believe its an issue with iTerm2.

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  • Java heap space

    - by java_mouse
    In Java/JVM, why do we call the memory place where Java creates objects as "Heap"? Does it use the Heap Data Structure to create/remove/maintain the objects? As I read in the documentation of Heap data structure, the algorithm compares the objects with existing nodes and places them in such a way that Parent object is "greater" than the children. ( Or "lesser" in case of min heap). So in JVM, how are the objects compared against each other before placing them in the heap?

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  • Make huge space savings by using SPARSE columns

    - by simonsabin
    I’ve blogged before about Getting more than 1024 columns on a table , this is done by using sparse columns. Whilst this is potentially useful for people with insane table designs, sparse columns aren’t just for this. My experience over the past few years has shown that sparse columns are useful for almost all databases when you have columns that are largely null i.e. sparse. A recent client was able to reduce the size of the table by 60% by changing columns to sparse. The way this is achieved is...(read more)

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