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  • xinjin 8:05 pm on April 8, 2012 Permalink | Reply  

    Ensemble Routing 

    My course project will focus ensemble routing. In this post, I’d like to introduce what ensemble routing is. Then I’ll talk about my progress in the future posts.

    As today’s data centers have hundreds of thousands of servers, scalability is a main design goal for data center networks. A major challenge is how to efficiently interconnect servers and provide efficiently traffic management for a huge amount of traffic flows from multiple tenants.

    Ensemble routing provided an efficient way to dynamically manage a huge amount of traffic flows in data center networks. The core idea of ensemble routing is to operate on the granularity of flow ensembles, rather than individual flows. A flow ensemble is a collection of flows, each of which follows the same routing path. Each flow, identified by the tenant ID and packet header tuple, is classified into a traffic class, which determines the QoS treatment for the flow, and a hash class, which is simply calculated by a hash function. The traffic class and the hash class determine the routing class of the flow, i.e., the flow ensemble the flow belongs to. By operating on the flow ensembles, ensemble routing greatly reduces management overhead and is scalable to manage a huge amount of traffic flows. Ensemble routing uses Virtual Local Area Networks (VLANs) to provide routing networks. It needs to effectively assign each flow ensemble, or routing class, to VLANs. The goal is to optimize network utilization for multiple tenants through load balancing.

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    Integrating AI into Vehicles 

    http://www.ibtimes.com/articles/305485/20120227/mercedes-benz-apple-siri-drive-kit-plus.htm

    A recent news says that Mercedes Benz plans to use Siri to power its A-class electronics system. With such integration, drivers are able to listen to music, change radio channels, make calls, send texts and find directions using just their voice. And drivers, while driving, can even update their facebook and twitter with Siri. This seems to be a plausible solution, as many things, such as sending texts, are prohibited during driving in most countries. But there are still problems. Firstly, using voice control to update facebook or send texts can still distract drivers, which is undoubtedly very dangerous. Secondly, according my personal experience with Siri, Siri is still not a that good software. It can not precisely understand what users say. For example, when you tell Siri to call Alice, Siri might call someone else. Then considering that in cars there is even more noise than in rooms, the interference may cause Siri to frequently misunderstand users’ request. Users may have to repeat several times until Siri gets what they want. Anyway, I think it is good that artificial intelligence actually begins to influence everyone’s life. I also expect more competitors against Siri to appear.

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  • xinjin 1:47 am on February 26, 2012 Permalink | Reply  

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    http://tech.slashdot.org/story/12/02/25/0111219/women-more-likely-to-unfriend-than-men

    A recent study on social networks by the Pew Research Center’s Internet and American Life Projects shows many interesting differences between women’s behaviors on social networks and men’s. One finding indicates that women are more likely to delete friends in their friend list than men. According to the study, 67% of women said that they have deleted friends compared to 58% of men. It seems that women cares more about their privacy and tend to use restrictive privacy settings. I guess there should be some reasons in the different personalities of women and men. Maybe women like to post pictures of the family and update information about their personal life, which makes them care more about who can read these news.

    The study also indicates that “a small group of what might be described as trigger-happy users say they post updates, comments, photos, or videos that they later regret sharing.” This is also an interesting phenomenon. Social networks make sharing more easily than ever before, which may have a potential effect on people’s willingness to share. It would be interesting if we could model such effect and see what factors contribute to such effect. I think the number of friends a person have may contribute a lot to her/his willingness to share. Intuitively, if one has lots of friends, after she/he does something exciting, she/he may want her/his friends to know it quickly.

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    http://www.nytimes.com/2012/02/12/sunday-review/big-datas-impact-in-the-world.html?pagewanted=all

    Recently, the above article about “big data” in NYTimes raises heated discussions. Definitely we are in the era of “big data”. Sensors all around the world are collecting tons of data every second. Even our smart phones contain a bunch of small sensors, which records our everyday life. Storage companies, such as EMC, are in the best of their time.

    However, one of the biggest questions is what we can do with so much data. It seems that people were drowned in such a big amount of data. As the stories in the article shows, people are still lack of the ability to discover useful information from large-scale data. While people are continuously spending money on collecting more and more data, such investment does not seem to have enough reward now. This is where needs more development in computer science, not only theoretical results in data mining and machine learning, but also real systems that can be put into practical use.

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  • xinjin 4:04 pm on February 12, 2012 Permalink | Reply  

    IBM seeks patent on judging programmers by commits 

    http://yro.slashdot.org/story/12/02/09/1624232/ibm-seeks-patent-on-judging-programmers-by-commit

    IBM applies for a patent which is used to judge programmers by commits. It can automatically analyze a programmer’s profile with data related to code repository updates by the programmer. With such analysis, it says it can help managers “avoid wasted time with ineffective developers”. I just wonder that by analyzing the algorithm the patent uses carefully, whether an inefficient programmer could pretend to be an efficient programmer.

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