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  • SpaceX’s Falcon 9 Launch Success And Reusable Rockets Test Partially Successful

    - by Gopinath
    Elon Musk’s SpaceX is closing on the dream of developing reusable rockets and likely in an year or two space launch rockets will be reusable just like flights, ships and cars. Today SpaceX launched an upgraded Falcon 9 rocket in to space to deliver satellites as well as to test their reusable rocket launching technology. All on board satellites were released on to the orbit and the first stage of rocket partially succeeded in returning back to Earth. This is a huge leap in space technology.   Couple of years ago reusable rockets were considered as impossible. NASA, Russian Space Agency, China, India or for that matter any other space agency never even attempted to build reusable rockets. But SpaceX’s revolutionary technology partially succeeded in doing the impossible! Elon Musk founded SpaceX with the goal of building reusable rockets and transporting humans to & from other planets like Mars. He says If one can figure out how to effectively reuse rockets just like airplanes, the cost of access to space will be reduced by as much as a factor of a hundred.  A fully reusable vehicle has never been done before. That really is the fundamental breakthrough needed to revolutionize access to space. Normally the first stage of a rocket falls back to Earth after burning out and is destroyed. But today SpaceX reignited first stage rocket after its separation and attempted to descend smoothly on to ocean’s surface. Though it did not fully succeed, the test was partially successful and SpaceX was able to recovers portions of first stage. Rocket booster relit twice (supersonic retro & landing), but spun up due to aero torque, so fuel centrifuged & we flamed out — Elon Musk (@elonmusk) September 29, 2013 With the partial success of recovering first stage, SpaceX gathered huge amount of information and experience it can use to improve Falcon 9 and build a fully reusable rocket. In post launch press conference Musk said if things go "super well", could refly a Falcon 9 1st stage by the end of next year. Falcon 9 Launch Video Next reusable first tests delayed by at least two launches SpaceX has a busy schedule for next several months with more than 50 missions scheduled using the new Falcon 9 rocket. Ten of those missions are to fly cargo to the International Space Shuttle for NASA.  SpaceX announced that they will not attempt to recover the first stage of Falcon 9 in next two missions. The next test will be conducted on  the fourth mission of Falcon 9 which is planned to carry cargo to Internation Space Station sometime next year. This will give time required for SpaceX to analyze the information gathered from today’s mission and improve first stage reentry systems. More reading Here are few interesting sources to read more about today’s SpaceX launch SpaceX post mission press conference details and discussion on Reddit Giant Leaps for Space Firms Orbital, SpaceX Hacker News community discussion on SpaceX launch SpaceX Launches Next-Generation Private Falcon 9 Rocket on Big Test Flight

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  • Adobe Flex ira finalement à la fondation Apache en compagnie de BlazeDS, Spark et Falcon, par l'entremise de l'Open Spoon Foundation

    Le SDK d'Adobe Flex ira finalement à la fondation Apache En compagnie de BlazeDS, Spark et Falcon, l'Open Spoon Foundation jouera l'intermédiaire Mise à jour du 17 novembre 2011 par Idelways La technologie Flex n'est plus sous le giron d'Adobe, mais tel un parent soucieux de l'avenir de son enfant au moment de l'abandonner, l'entreprise semble indécise quant au choix de l'organisme d'accueil. Hier, à la révélation du don de la technologie à l'open source (lire ci-devant), c'est l'Open Spoon Foundation qui était pressentie pour ce rôle. Cette dernière avait revendiqué le projet avant qu'une mise à jour de la FAQ d'Adobe ...

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  • Scrum Board for a distributed team

    - by Falcon
    I am looking for recommendations on a digital Scrum Board which can be shared over the internet. I imagine something like a big tablet on which you can draw and which remote users can access, too. I dislike Scrum software because I think one major benefit of a Scrum Board is its physical presence. It should be hard to ignore. The best solution would be two big tablets on which you can draw and which can be synchronized. Has anyone got product recommendations for something like this? Or would you rather use a software? Kind regards, Falcon

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  • Library missing for executable file

    - by user1610406
    There's an executable I downloaded onto my Ubuntu 10.04 and I can't run because it's missing a library. I have also tried compiling the source with CMake. This is my Terminal output: zack@zack-laptop:~/Desktop$ ./MultiMC ./MultiMC: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory I think I need libssl 1.0 to run this file, but I'm not sure. Any help?

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  • How to make sysctl network bridge settings persist after a reboot?

    - by Zack Perry
    I am setting up a notebook for software demo purpose. The machine has 8GB RAM, a Core i7 Intel CPU, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit. The notebook is used as a KVM host and runs a few KVM guests. All such guests use the virbr0 default bridge. To enable them to communicate with each other using multicast, I added the following to the host's /etc/sysctl.conf, as shown below net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 Afterwards, following man sysctl(8), I issued the following: sudo /sbin/sysctl -p /etc/sysctl.conf My understanding is that this should make these settings persist over reboots. I tested it, and was surprised to find out the following: root@sdn1 :/proc/sys/net/bridge# more *tables :::::::::::::: bridge-nf-call-arptables :::::::::::::: 1 :::::::::::::: bridge-nf-call-ip6tables :::::::::::::: 1 :::::::::::::: bridge-nf-call-iptables :::::::::::::: 1 All defaults are coming back! Yes. I can use some kludgy "get arounds" such as putting a /sbin/sysctl -p /etc/sysctl.conf into the host's /etc/rc.local but I would rather "do it right". Did I misunderstand the man page or is there something that I missed? Thanks for any hints. -- Zack

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  • Know your Data Lineage

    - by Simon Elliston Ball
    An academic paper without the footnotes isn’t an academic paper. Journalists wouldn’t base a news article on facts that they can’t verify. So why would anyone publish reports without being able to say where the data has come from and be confident of its quality, in other words, without knowing its lineage. (sometimes referred to as ‘provenance’ or ‘pedigree’) The number and variety of data sources, both traditional and new, increases inexorably. Data comes clean or dirty, processed or raw, unimpeachable or entirely fabricated. On its journey to our report, from its source, the data can travel through a network of interconnected pipes, passing through numerous distinct systems, each managed by different people. At each point along the pipeline, it can be changed, filtered, aggregated and combined. When the data finally emerges, how can we be sure that it is right? How can we be certain that no part of the data collection was based on incorrect assumptions, that key data points haven’t been left out, or that the sources are good? Even when we’re using data science to give us an approximate or probable answer, we cannot have any confidence in the results without confidence in the data from which it came. You need to know what has been done to your data, where it came from, and who is responsible for each stage of the analysis. This information represents your data lineage; it is your stack-trace. If you’re an analyst, suspicious of a number, it tells you why the number is there and how it got there. If you’re a developer, working on a pipeline, it provides the context you need to track down the bug. If you’re a manager, or an auditor, it lets you know the right things are being done. Lineage tracking is part of good data governance. Most audit and lineage systems require you to buy into their whole structure. If you are using Hadoop for your data storage and processing, then tools like Falcon allow you to track lineage, as long as you are using Falcon to write and run the pipeline. It can mean learning a new way of running your jobs (or using some sort of proxy), and even a distinct way of writing your queries. Other Hadoop tools provide a lot of operational and audit information, spread throughout the many logs produced by Hive, Sqoop, MapReduce and all the various moving parts that make up the eco-system. To get a full picture of what’s going on in your Hadoop system you need to capture both Falcon lineage and the data-exhaust of other tools that Falcon can’t orchestrate. However, the problem is bigger even that that. Often, Hadoop is just one piece in a larger processing workflow. The next step of the challenge is how you bind together the lineage metadata describing what happened before and after Hadoop, where ‘after’ could be  a data analysis environment like R, an application, or even directly into an end-user tool such as Tableau or Excel. One possibility is to push as much as you can of your key analytics into Hadoop, but would you give up the power, and familiarity of your existing tools in return for a reliable way of tracking lineage? Lineage and auditing should work consistently, automatically and quietly, allowing users to access their data with any tool they require to use. The real solution, therefore, is to create a consistent method by which to bring lineage data from these data various disparate sources into the data analysis platform that you use, rather than being forced to use the tool that manages the pipeline for the lineage and a different tool for the data analysis. The key is to keep your logs, keep your audit data, from every source, bring them together and use the data analysis tools to trace the paths from raw data to the answer that data analysis provides.

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  • Pros & Cons: Hibernate vs. EJB 3

    - by Zack
    What are the advantages and disadvantages of Hibernate & EJB3 relative to each other? I found this post, but it didn't really address my question. If I don't have any particular tie to either technology, what would cause me to pick one over the other? Or are there situations where I would want to use both? Thanks, Zack

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  • How to write gSOAP server using VC++ (VS2008)?

    - by Falcon
    Hi, I have downloaded gSOAP2.8 from sourceforge. I want to use it for writting a gsoap based server. I need to be able to invoke my C++ code from PHP UI. E.g. My php page would show something like: $res = a + b = ? [Submit] When submit button is clicked I want these parameters to be passed to my c++ function lets say compute_sum() ... and this function should be invoked with these parameters, and the results given back to my php page. I want to write this gsoap based c++ server. Can someone please help me with getting started with it? I need to know: 1] What kind of c++ code it should it be? (Windows console app, or a windows service) 2] How do I launch this server? (Would it need to be a webservice, hosted over something like apache?) Please advise and guide. Regards, Falcon

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  • What does SetTextureStage(0, D3DTSS_COLORARG2, 0) in DirectX mean?

    - by Vite Falcon
    I'm trying to convert some DirectX code to Ogre3D and was wondering what the following translates to: pDev->SetTextureStage(0, D3DTSS_TEXCOORDINDEX, 0) pDev->SetTextureStage(0, D3DTSS_COLORARG1, D3DTA_TEXTURE) pDev->SetTextureStage(0, D3DTSS_COLOROP, D3DTOP_MODULATE) pDev->SetTextureStage(0, D3DTSS_COLORARG2, 0) What is the modulation operation happening here? Is the texture getting modulated with the background? Or is it getting zeroed? I've tried searching for what this means and unfortunately I haven't come across anything meaningful. Any help to shed light on this matter will be much appreciated.

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  • How should I configure TRIM Support for LVM logical volumes?

    - by Zack Perry
    I am setting up a notebook for software demo purpose. The machine has a Intel Core i7 CPU, 8GB RAM, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit desktop. As it is, the SSD is configured to have a single volume group, with /boot, /swap, and / all in their respective logical volumes. They collectively consume 30GB space. I plan to use the remaining for logical volumes for KVM guests, all run Ubuntu 12.04 Server I would like to ensure that the SSD is utilized optimally. Although on this site, there are some great info about setting up TRIM support for file system setups that do not involve LVM, I have not found explicit guide regarding my planned setup. I did found this page which talks about adding issue_discards in /etc/lvm/lvm.conf. But in said file on my machine, I didn't find the cited content. I double-checked man lvm.conf(5), didn't see any mentioning of this option either. Thus, I'm not sure what to do. Furthermore, even say adding the option is the right thing to do, should I in my machine's /etc/fstab still add mount options such as noatime etc? Any tips, pointers, and/or further guidance are greatly appreciated.

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  • WiFi not working on Dell Inspiron 1564

    - by Zack Warren
    hope you can offer some help! I'm new to Ubuntu (and Linux for that matter), but I managed to install Ubuntu 12.04 yesterday on an old Dell Inspiron 1564 Laptop. Everything works fine, with the exception of the wireless connection. Using my wired ethernet, I was able to look up several solutions which seemed as if they would work, but I've had no luck. Currently, wireless does show as enabled, but all wireless networks are disconnected, in fact, none of the networks are even listed (and I can see them on other devices in the home). Let me know what you need to help me! Thanks in advance!

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  • Creating a retro-style palette swapping effect in OpenGL

    - by Zack The Human
    I'm working on a Megaman-like game where I need to change the color of certain pixels at runtime. For reference: in Megaman when you change your selected weapon then main character's palette changes to reflect the selected weapon. Not all of the sprite's colors change, only certain ones do. This kind of effect was common and quite easy to do on the NES since the programmer had access to the palette and the logical mapping between pixels and palette indices. On modern hardware, though, this is a bit more challenging because the concept of palettes is not the same. All of my textures are 32-bit and do not use palettes. There are two ways I know of to achieve the effect I want, but I'm curious if there are better ways to achieve this effect easily. The two options I know of are: Use a shader and write some GLSL to perform the "palette swapping" behavior. If shaders are not available (say, because the graphics card doesn't support them) then it is possible to clone the "original" textures and generate different versions with the color changes pre-applied. Ideally I would like to use a shader since it seems straightforward and requires little additional work opposed to the duplicated-texture method. I worry that duplicating textures just to change a color in them is wasting VRAM -- should I not worry about that?

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  • Materialized View vs POJO View based on Objects representing Oracle tables

    - by Zack Macomber
    I have about 12 Oracle tables that represent data that's being integrated from an external system into my web application. This data is going to be used in an informational and comparative manner for the clients using my web application. On one particular page of my web application, I need to combine data from 3 - 5 Oracle tables for display as an HTML table on the page. We are NOT currently using a framework (Apache Struts for instance) and we're not in a position to move this Java web application into one at this moment (I'm trying to get us there...). I am certainly not an architect, but I see one of two ways that I can effectively build this page (I know there are other ways, but these seem like they would be good ones...): 1. Create an Oracle Materialized View that represents what the HTML table should look like and then create a POJO based on the View that I can then integrate into my JSP. 2. Create POJOs that represent the Oracle tables themselves and then create another POJO that is the View used for the HTML table and then integrate that POJO into my JSP. To me, it seems the Materialized View would possibly offer quicker results which is always what we strive for in web applications. But, if I just create 12 POJOs that represent the Oracle tables and then build POJO Views off of those, I have the advantage of keeping all the code in one place for this and possibility for creating any number of different views and reusable components in my web application. Any thoughts on which one might be the better route? Or, maybe you know of an even better one?

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  • Advertising cookies ( ad sense ) on google chrome [closed]

    - by zack
    ok first I'm not sure if this is right stackexchange site to ask but I'm not sure if there is better one as question is quite general When I visit one site, and if this site runs google adsense campaign, I can see its ads on other sites. I suppose this is cookie from this site and than it's showing ads using the cookie However, I removed this specific cookie and cleared cache, and I can still see this same ad showing on other sites running adsense My question is, is there is something wrong with google chrome, is there a possibility that Google stores data within google chrome itself? If not, how else they could trace which ads to show?

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  • Unresolved external symbol - MySQL API C++

    - by Zack_074
    Hey I've had nonstop problems with SQL. I'm trying to get some experience because I know it's a vital part of the industry. I got it working with C#, but now I'm working on connecting to a database in c++. I have the project properly linked and what not. Here's my code and the errors I'm getting. #include "stdafx.h" #include <mysql.h> #include <iostream> MYSQL mysql; MYSQL_RES result; using namespace std; int _tmain(int argc, _TCHAR* argv[]) { mysql_init(&mysql); if(!mysql_real_connect(&mysql, "localhost", "root", "angel552002", "MyDatabse", 0, NULL, 0)) { printf("Failed to connect"); } return 0; } and the errors: Error 1 error LNK2001: unresolved external symbol _mysql_real_connect@32 c:\Users\Zack-074\documents\visual studio 2010\Projects\MySql\MySql\MySql.obj Error 2 error LNK2001: unresolved external symbol _mysql_init@4 c:\Users\Zack-074\documents\visual studio 2010\Projects\MySql\MySql\MySql.obj Error 3 error LNK1120: 2 unresolved externals c:\users\zack-074\documents\visual studio 2010\Projects\MySql\Debug\MySql.exe 1 I really appreciate the help.

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  • I am under DDoS. What can I do?

    - by Falcon Momot
    This is a Canonical Question about DoS and DDoS mitigation. I found a massive traffic spike on a website that I host today; I am getting thousands of connections a second and I see I'm using all 100Mbps of my available bandwidth. Nobody can access my site because all the requests time out, and I can't even log into the server because SSH times out too! This has happened a couple times before, and each time it's lasted a couple hours and gone away on its own. Occasionally, my website has another distinct but related problem: my server's load average (which is usually around .25) rockets up to 20 or more and nobody can access my site just the same as the other case. It also goes away after a few hours. Restarting my server doesn't help; what can I do to make my site accessible again, and what is happening? Relatedly, I found once that for a day or two, every time I started my service, it got a connection from a particular IP address and then crashed. As soon as I started it up again, this happened again and it crashed again. How is that similar, and what can I do about it?

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  • GNOME Screensaver Widgets

    - by Dark Falcon
    Is there a way to add widgets to a Gnome screensaver? I think this can be done with KDE 4, but I've never liked KDE very much. I'm a programmer and comfortable with writing code if needed. I'd like to be able to: See the weather and forecast Control Rhythmbox Use a flash card widget for reviewing musical concepts The reason I want these on the screensaver is that I have login restrictions. I would like to be able to do a very limited subset of activities without having to log in.

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  • didSelectRowAtIndexPath does not get called when scrolling and selecting a cell

    - by Falcon
    Hi all, It seems when I scroll my table view that if I select a cell while the table view is still scrolling, didSelectRowAtIndexPath doesn't get called. It works fine when the table view is still. Any ideas on why this might be? Also, is there a way that didSelectRowAtIndexPath can be called on press down? It seems it gets called after my finger/cursor is raised off of the cell. Thanks,

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  • Flash object location

    - by Falcon
    Hello i need to know there my flash application is running. in object src my domain. but flash running on others domains. and i want to know where. and send it with request on my server. Thanks. sorry for y bad grammar.

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  • Serialization problem

    - by Falcon eyes
    Hi Every body I have a problem and want help. I have created a phonebook application and it works fine after a awhile i liked to make an upgrade for my application and i started from scratch i didn't inherit it from my old class,and i successes too ,my request "I want to migrate my contacts from the old application to the new one" ,so i made an adapter class for this reason in my new application with the following code using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Windows.Forms; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; namespace PhoneBook { class Adapter { PhoneRecord PhRecord; //the new application object CTeleRecord TelRecord; //the old application object string fileName; public Adapter(string filename) { fileName = filename; } public void convert() { PhRecord = new PhoneRecord(); TelRecord = new CTeleRecord(); FileStream OpFileSt = new FileStream(fileName, FileMode.Open,FileAccess.Read); BinaryFormatter readBin = new BinaryFormatter(); for (; ; ) { try { TelRecord.ResetTheObject(); TelRecord = (CTeleRecord)readBin.Deserialize(OpFileSt); PhRecord.SetName = TelRecord.GetName; PhRecord.SetHomeNumber = TelRecord.GetHomeNumber; PhRecord.SetMobileNumber = TelRecord.GetMobileNumber; PhRecord.SetWorkNumber = TelRecord.GetWorkNumber; PhRecord.SetSpecialNumber = TelRecord.GetSpecialNumber; PhRecord.SetEmail = TelRecord.GetEmail; PhRecord.SetNotes = TelRecord.GetNotes; PhBookContainer.phBookItems.Add(PhRecord); } catch (IOException xxx) { MessageBox.Show(xxx.Message); } catch (ArgumentException tt) { MessageBox.Show(tt.Message); } //if end of file is reached catch (SerializationException x) { MessageBox.Show(x.Message + x.Source); break; } } OpFileSt.Close(); PhBookContainer.Save(@"d:\MyPhBook.pbf"); } } } the problem is when i try to read the file ctreated by my old application i receive serialization exception with this message "Unabel to find assembly 'PhoneBook,Version=1.0.0.0,Culture=neutral,PublicK eyToken=null" and the source of exceptionis mscorlib. when i read the same file with my old application(Which is the origin of the file)i have no problem and idon't know what to do to make my adapter class work.so can somebody help please.

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  • Find Line Above or Below in Javascript

    - by Dark Falcon
    I am working on an in-place HTML editor, concentrating on Firefox only right now. I have an element inserted where the cursor should be and also have left and right arrows working, but I can't seem to find a way to find: Start and end of a line for the home and end keys The next line up or down for the up/down arrows. I see document.elementFromPoint, but this doesn't get me a Range object. The Range object itself seems rather useless when it comes to using pixel positions.

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  • One class instance throw all controller

    - by Falcon
    Hello i i have different class and controller. and i need that one instance of model will be available in controller/ now i'm doing something like this: def method1 inst = @MyClass.new(params) inst.action .... def method2 inst = @MyClass.new(params) inst.action .... but i want something like this def method1 @inst.action .... def method2 @inst.action or self.inst i't doesn't matter how i can do it? def self.inst MyClass.new(params) end doesn't work...

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