Thursday, October 24, 2013

Use MongoDB to make your app location-aware



Since I've been the boss man, I find I have fewer opportunities to get into the details of coding as I spend more time dealing with annoyances. Once again, I'm handing over this blog to one of my crack developers, Jonathan Freeman. I think you'll find his explanation of geospatial queries in MongoDB highly useful. -- Andy


The surging popularity of Hadoop has paved the way to storing and processing gobs of semistructured data. Batch processing data is a great way to study the past in high definition, but it's constrained by the simple phrase "next time." As in: "Looks like our customers didn't like the way the checkout process went, let's change that for next time."


Constructing a "this time" solution can be approached in several ways. One angle of attack is to combine batch and real-time analytics: Set up MapReduce jobs to run every night, for example, and pipe the results into a NoSQL database to be queried throughout the day. MapReduce distills and condenses the data set, allowing it to be accessed quickly as needed.


[ Work smarter, not harder with InfoWorld's roundup of tips and trends programmers need to know in the Developers' Survival Guide. Download the PDF today! | Keep up with the latest developer news with InfoWorld's Developer World newsletter. ]


Another approach is to focus on the state of the user at the current moment. In other words, context -- not what will be, but what is, right now. And particularly for mobile applications, what information could be more important about the user's state than his or her geolocation?


Location awareness is an idea that's spreading both inside the tech world and out (just think about the locavore or farm-to-table trends in the foodie community). GPS-enabled mobile devices have been a boon to developers and technology providers paying attention to these trends. One such provider is our new favorite billion-dollar NoSQL company, MongoDB.


MongoDB's new geospatial query in action
MongoDB has had native geospatial queries for a while (famously used by Foursquare), which make finding documents that are near a given point or documents that lie within a given polygon a breeze.


The latest production release introduced a new query operator: $geoIntersects. The operator packs quite a punch, filling in functionality lacking in previous versions. For example, if you wanted to supply a point and find all the documents enclosing that point, you had to do it on your application layer. If you wanted to supply a polygon and see which documents overlap, you had to do it on your application layer. If you wanted to supply a line and see which documents could be found on that line, you did it in your application layer.


Happily, $geoIntersects does all that and more. On top of the flexibility, it's incredibly easy to use. The general idea is that you can supply a point, line, or polygon, and any document that intersects with the supplied geometry will be returned. To demonstrate, I've built a little Web app that relies on the query.


The app takes a starting and ending address, finds a bike route for the supplied points, and tells you all the Chicago neighborhoods you'd pass through. It will also tell you which Chicago neighborhood you're in at the moment. The app is simple, but shows two possible uses of the new query operator. Here's what it looks like:



TEXT



Source: http://www.infoworld.com/d/application-development/use-mongodb-make-your-app-location-aware-229403?source=rss_infoworld_top_stories_
Similar Articles: penn state   Beyond Two Souls   Boulder Flooding   taylor swift   PS4 release date  

Time Warner Cable to carry Al Jazeera America

(AP) — Time Warner Cable and Al Jazeera America say they've reached a deal for the cable company to start carrying the channel.

Al Jazeera America will be launched over the next six months on digital basic cable services in Time Warner Cable as well as Bright House Networks markets, including New York, Los Angeles and Dallas.

Financial terms were not disclosed.

The deal will make Al Jazeera America available to almost 55 million homes.

Al Jazeera America began broadcasting in August. It has said it wants to provide unbiased, in-depth domestic and global news. But it faces the challenge of overcoming suspicions that some Americans may have about a news organization that is controlled by a foreign government and part of a larger company described by some critics as anti-American.

Associated PressSource: http://hosted2.ap.org/APDEFAULT/4e67281c3f754d0696fbfdee0f3f1469/Article_2013-10-24-Time%20Warner%20Cable-Al%20Jazeera%20America/id-1aa8dd66200f41fb9f8b05c6a219df05
Related Topics: Why Did The Government Shut Down   ncis   Namaste   Eiza Gonzalez   obama  

Builders of Obama's health website saw red flags

White House press secretary Jay Carney introduces Council of Economic Advisers Chairman Jason Furman who spoke about the economy post government shutdown at the daily press briefing at the White House in Washington, Tuesday, Oct. 22, 2013. Furman said the addition of 148,000 jobs in September is a sign of "solid" growth but forecasts worsening in October because of the 16-day partial government shutdown. (AP Photo/Charles Dharapak)







White House press secretary Jay Carney introduces Council of Economic Advisers Chairman Jason Furman who spoke about the economy post government shutdown at the daily press briefing at the White House in Washington, Tuesday, Oct. 22, 2013. Furman said the addition of 148,000 jobs in September is a sign of "solid" growth but forecasts worsening in October because of the 16-day partial government shutdown. (AP Photo/Charles Dharapak)







President Barack Obama gestures while speaking in the Rose Garden of the White House in Washington, Monday, Oct. 21, 2013, on the initial rollout of the health care overhaul. Obama acknowledged that the widespread problems with his health care law's rollout are unacceptable, as the administration scrambles to fix the cascade of computer issues. (AP Photo/Charles Dharapak)







President Barack Obama, standing with supporters of his health care law, speaks in the Rose Garden of the White House in Washington, Monday, Oct. 21, 2013, on the initial rollout of the health care overhaul. Obama acknowledged that the widespread problems with his health care law's rollout are unacceptable, as the administration scrambles to fix the cascade of computer issues. (AP Photo/Charles Dharapak)







President Barack Obama gestures while speaking in the Rose Garden of the White House in Washington, Monday, Oct. 21, 2013, on the initial rollout of the health care overhaul. Obama acknowledged that the widespread problems with his health care law's rollout are unacceptable, as the administration scrambles to fix the cascade of computer issues. (AP Photo/ Evan Vucci)







(AP) — Crammed into conference rooms with pizza for dinner, some programmers building the Obama administration's showcase health insurance website were growing increasingly stressed. Some worked past 10 p.m., energy drinks in hand. Others rewrote computer code over and over to meet what they considered last-minute requests for changes from the government or other contractors.

As questions mount over the website's failure, insider interviews and a review of technical specifications by The Associated Press found a mind-numbingly complex system put together by harried programmers who pushed out a final product that congressional investigators said was tested by the government and not private developers with more expertise.

Meanwhile, the White House said that President Barack Obama's longtime adviser Jeffrey Zients will provide management advice to help fix the system. White House press secretary Jay Carney says Zients will be on a short-term assignment at the Health and Human Services Department before he's due to take over as director of Obama's National Economic Council Jan. 1.

Carney cited Zients' expertise as a longtime management consultant and his "proven track record" since coming to the White House in 2009, both as interim budget director and as chief performance officer, when he headed an effort to streamline government and cut costs. "We're engaged in an all-out effort to improve the online experience," Carney said.

This is not the first time Obama has turned to Zients for help solving a major problem. In the 2009, after far more drivers than anticipated signed up for the Cash for Clunkers program that promised rebates to people who traded in their old cars for more fuel-efficient vehicles, Obama assigned Zients, his deputy budget director at the time, to help eliminate the backlog.

When the same thing happened with sign-ups for an updated version of the GI Bill, one designed to help the 9/11 generation of veterans get a college education, Obama again turned to Zients.

"He's not going to be looking under the hood and tell you 'I can fix the coding, I can fix it,'" Kenneth Baer, who was a senior adviser to Zients at the budget office, said of Zients' newest assignment. "His skill is going to be how to identify challenges, prioritize what solutions need to be done next, assessing what talent is already available and then how to motivate them to do that job as quickly and as ably as possible."

Aneesh Chopra, who was Obama's chief technology officer, said Zients is extremely skilled in figuring things out from a management perspective.

"If I was confident this issue would be resolved before his participation, I am doubly so now," said Chopra, who also worked with Zients at the Advisory Board Co., one of two business advisory firms where Zients held top posts. "Jeff's track record is really a relentless focus on execution."

Health and Human Services Secretary Kathleen Sebelius said in a post on HealthCare.gov that her agency is also bringing in more experts and specialists from government and industry, including top Silicon Valley companies.

"This new infusion of talent will bring a powerful array of subject matter expertise and skills, including extensive experience scaling major IT systems," she said. "This effort is being marshaled as part of a cross-functional team that is working aggressively to diagnose parts of HealthCare.gov that are experiencing problems, learn from successful states, prioritize issues, and fix them."

Project developers for the health care website who spoke to the AP on condition of anonymity — because they feared they would otherwise be fired — said they raised doubts among themselves whether the website could be ready in time. They complained openly to each other about what they considered tight and unrealistic deadlines. One was nearly brought to tears over the stress of finishing on time, one developer said. Website builders saw red flags for months.

A review of internal architectural diagrams obtained by the AP revealed the system's complexity. Insurance applicants have a host of personal information verified, including income and immigration status. The system connects to other federal computer networks, including ones at the Social Security Administration, IRS, Veterans Administration, Office of Personnel Management and the Peace Corps.

Obama on Monday acknowledged technical problems that he described as "kinks in the system." But in remarks at a Rose Garden event, Obama offered no explanation for the failure except to note that high traffic to the website caused some of the slowdowns. He said it had been visited nearly 20 million times — fewer monthly visits so far than many commercial websites, such as PayPal, AOL, Wikipedia or Pinterest.

"The problem has been that the website that's supposed to make it easy to apply for and purchase the insurance is not working the way it should for everybody," Obama said. "There's no sugarcoating it. The website has been too slow. People have been getting stuck during the application process. And I think it's fair to say that nobody is more frustrated by that than I am."

The online system was envisioned as a simple way for people without health insurance to comparison-shop among competing plans offered in their state, pick their preferred level of coverage and cost and sign up. For many, it's not worked out that way so far.

Just weeks before the launch of HealthCare.gov on Oct. 1, one programmer said, colleagues huddled in conference rooms trying to patch "bugs," or deficiencies in computer code. Unresolved problems led to visitors experiencing cryptic error messages or enduring long waits trying to sign up.

Congressional investigators have concluded that the government's Centers for Medicare and Medicaid Services, not private software developers, tested the exchange's computer systems during the final weeks. That task, known as integration testing, is usually handled by software companies because it ferrets out problems before the public sees the final product.

The government spent at least $394 million in contracts to build the federal health care exchange and the data hub. Those contracts included major awards to Virginia-based CGI Federal Inc., Maryland-based Quality Software Services Inc. and Booz Allen Hamilton Inc.

CGI Federal said in a statement Monday it was working with the government and other contractors "around the clock" to improve the system, which it called "complex, ambitious and unprecedented."

The schematics from late 2012 show how officials designated a "data services hub" — a traffic cop for managing information — in lieu of a design that would have allowed state exchanges to connect directly to government servers when verifying an applicant's information. On Sunday, the Health and Human Services Department said the data hub was working but not meeting public expectations: "We are committed to doing better."

Administration officials so far have refused to say how many people actually have managed to enroll in insurance during the three weeks since the new marketplaces became available. Without enrollment numbers, it's impossible to know whether the program is on track to reach projections from the Congressional Budget Office that 7 million people would gain coverage during the first year the exchanges were available.

Instead, officials have selectively cited figures that put the insurance exchanges in a positive light. They say more than 19 million people have logged on to the federal website and nearly 500,000 have filled out applications for insurance through both the federal and state-run sites.

The flood of computer problems since the website went online has been deeply embarrassing for the White House. The snags have called into question whether the administration is capable of implementing the complex policy and why senior administration officials — including the president — appear to have been unaware of the scope of the problems when the exchange sites opened.

Even as the president spoke at the Rose Garden, more problems were coming to light. The administration acknowledged that a planned upgrade to the website had been postponed indefinitely and that online Spanish-language signups would remain unavailable, despite a promise to Hispanic groups that the capability would start this week. And the government tweaked the website's home page so visitors can now view phone numbers to apply the old-fashioned way or window-shop for insurance rates without registering first.

The House Energy and Commerce Committee was expected to conduct an oversight hearing Thursday, probably without Sebelius testifying. She could testify on Capitol Hill on the subject as early as next week.

Uninsured Americans have until about mid-February to sign up for coverage if they are to meet the law's requirement that they be insured by the end of March. If they don't, they will face a penalty. The administration says it's working to address the timing issue to provide more flexibility.

Sen. Marco Rubio, R-Fla., plans to introduce legislation to delay that requirement because: "It's not fair to punish people for not buying something that's not available," Rubio told "CBS This Morning" on Tuesday.

Citing the website problems, Sen. Jeanne Shaheen, D-N.H., also urged the White House to extend the open enrollment period past March 31, 2014.

In a letter Tuesday to Obama, Shaheen suggested extending open enrollment to "provide greater flexibility for the American people seeking to access health insurance," according to an emailed statement from her office. Shaheen also asked the White House to clarify how the "individual responsibility penalty will be administered and enforced" in light of the website's difficulties.

On Monday, the White House advised people frustrated by the online tangle that they can enroll by calling 1-800-318-2596 in a process that should take 25 minutes for an individual or 45 minutes for a family. Assistance is also available in communities from helpers who can be found at LocalHelp.HealthCare.gov.

___

Associated Press writers Ricardo Alonso-Zaldivar and Darlene Superville contributed to this report.

___

Follow Jack Gillum on Twitter at http://twitter.com/jackgillum or Julie Pace at http://twitter.com/jpaceDC.

Associated PressSource: http://hosted2.ap.org/APDEFAULT/89ae8247abe8493fae24405546e9a1aa/Article_2013-10-22-Obama-Health%20Care/id-077414b1e5ec445bab6e6ce97a25d0f7
Similar Articles: The Blacklist   Niall Horan   US News college rankings   Disney Infinity   Charlie Manuel  

Bank of America liable for Countrywide mortgages fraud


By Nate Raymond


NEW YORK (Reuters) - Bank of America Corp was found liable for fraud on Wednesday on claims related to defective mortgages sold by its Countrywide unit, a major win for the U.S. government in one of the few big trials stemming from the financial crisis.


Following a four-week trial, a federal jury in Manhattan found the Charlotte, North Carolina bank liable on one civil fraud charge. Countrywide originated shoddy home loans in a process called "Hustle" and sold them to government mortgage giants Fannie Mae and Freddie Mac, the government said.


The four men and six women on the jury also found former Countrywide executive, Rebecca Mairone, liable on the one fraud charge facing her.


A decision on how much to penalize the bank would be left to U.S. District Judge Jed Rakoff. The U.S. Department of Justice has said it would ask Rakoff to award up to $848.2 million, the gross loss it said Fannie and Freddie suffered on the loans.


Bank of America bought Countrywide in July 2008. Two months later, the government took over Fannie and Freddie.


"The jury's decision concerned a single Countrywide program that lasted several months and ended before Bank of America's acquisition of the company," Bank of America spokesman Lawrence Grayson said. "We will evaluate our options for appeal."


Wednesday's verdict marked a major victory for the Justice Department, which has come under criticism for failing to hold banks and executives accountable for their roles in the events leading up to the financial crisis.


In late afternoon trading, Bank of America shares were down 27 cents at $14.25 on the New York Stock Exchange.


WHISTLEBLOWER


The lawsuit stemmed from a whistleblower case originally brought by Edward O'Donnell, a former Countrywide executive who stands to earn up to $1.6 million if the government prevailed.


It centered on a program called the "High Speed Swim Lane" - also called "HSSL" or "Hustle" - that government lawyers said Countrywide started in 2007 as it sought to move away from subprime lending and issue prime loans.


Prime loans are considered less risky than subprime. But the Justice Department said fraud and other defects were rampant in HSSL loans, because Countrywide eliminated loan quality checkpoints and paid employees based on loan volume and speed.


The Justice Department said the process was overseen by Mairone, a former chief operating officer of Countrywide's Full Spectrum Lending division.


Mairone later became a managing director at JPMorgan Chase & Co. That bank had no immediate comment.


In 2012, the Justice Department intervened in O'Donnell's lawsuit and filed its own complaint under the Financial Institutions Reform, Recovery, and Enforcement Act of 1989. That law, passed in the wake of the 1900s savings-and-loan scandals, covers fraud affecting federally insured financial institutions.


The case is U.S. ex rel. O'Donnell v. Bank of America Corp et al, U.S. District Court, Southern District of New York, No. 12-01422.


(Reporting by Nate Raymond; Additional reporting by Jonathan Stempel; Editing by Leslie Gevirtz)

Source: http://news.yahoo.com/bank-america-loses-fraud-trial-over-u-mortgages-194751822--sector.html
Tags: tlc   Dylan Penn   The Blacklist   courtney stodden   dexter  

Red Sox rout Cardinals in Game 1 of World Series



BOSTON – Sending out an APB: If anyone locates the real St. Louis Cardinals, please alert authorities immediately. The only explanation for what happened in Game 1 of the World Series was that imposters took the field at Fenway Park in Cardinals regalia.



Among the dropped flip, the fumbled grab, the bungled pop-up, the mangled backhand, the errant catch and the do-si-do groundball, the Cardinals packed a half-dozen flubs into the first two innings, and the Boston Red Sox pummeled them 8-1 Wednesday night in a game far worse than the final score indicated – and the final was quite awful in and of itself.


[Yahoo Sports Shop: Gear up for the World Series with official team gear]


While nobody ever mistook these Cardinals for a field full of Ozzie Smiths, to see them melt down so spectacularly served as the initial insult. Losing Carlos Beltran to bruised ribs suffered when robbing David Ortiz of a grand slam was the injury. And getting shut down by Red Sox starter Jon Lester dropped a moldy cherry atop a sundae of awful.


The disciplined Cardinals of the regular season, their 97 victories matching Boston's for most in the major leagues, went AWOL from the beginning of the game. Starter Adam Wainwright, who began the season with 34 2/3 straight innings without a walk, walked leadoff hitter Jacoby Ellsbury. Then came a Dustin Pedroia hit, which presaged chaos.


Ortiz hit a ground ball, and it should have been an easy force out at second base on a Matt Carpenter flip. Only Cardinals shortstop Pete Kozma dropped the ball. Initially, umpire Dana DeMuth called him out, by a long shot the worst error on Wednesday night, which is saying something. The six-umpire crew got together, reversed the call, watched Mike Napoli clear the bases with the help of a Shane Robinson misplay in center field and stake Boston to a 3-0 advantage.


Wainwright lurched off the field frustrated, and understandably so: Boston was squaring up his pitches, and rather than feed off the 38,345 at Fenway, the atmosphere, in concert with his team botching a pair of plays, quickly turned claustrophobic.


Carlos Beltran robs David Ortiz of a grand slam, but was injured on the play and left the game. (AP Photo) "What I found throughout my playoff career so far is that I respond really well when the adrenaline really kicks in," Wainwright said Tuesday. "I love that. The crowd gets louder. I get more fired up. That's something that I just – I can't tell you how cool it is to pitch in front of great crowds like we're going to have [Wednesday] here in Boston, and we're going to have in St. Louis with that crisp, cool air, that Octobery kind of air, where you know it's playoff baseball.


"This is my favorite time of year, for many reasons. There's NFL football on TV, there's college football on TV, there's hunting season, there's playoff baseball. It does not get much better than that."


Nope. It got a lot worse.


Stephen Drew, the first batter of the second inning, hitting .083 this postseason, popped a short fly in between Wainwright and catcher Yadier Molina. They weren't more than 5 feet from one another when the ball hit the ground in between them. Neither said a word. Laughter from the stands filled the silence.


Later in the inning, it stopped on account of pity. Shane Victorino's grounder that glanced off Kozma's glove? It was just piling on. A bases-loaded ground ball from Pedroia that snuck by Freese? Have mercy. Beltran did what Torii Hunter couldn't in the ALCS – steal a grand slam from Ortiz with an over-the-fence catch in right field – though the price was significant. He went to a nearby hospital for further examination, and his status for Game 2 on Thursday was in question.


Misery continued deep into the Boston night. Cardinals swung and miss with regularity at Lester, who threw 7 2/3 shutout innings. Even when they loaded the bases in the fourth, Freese hit into a 1-2-3 double play. And he made the Cardinals' third error of the night with a bad throw in the seventh inning. Followed immediately by Ortiz hitting one nobody would catch into the right-field bleachers for a 7-0 advantage. St. Louis’ lone run came on a Matt Holliday homer in the ninth inning.


It puts the Cardinals in the position of having to rely again on rookie Michael Wacha, thus far the best pitcher in the 2013 postseason. He faces John Lackey, a World Series MVP 11 years ago and back for the first time since. And if he's anything like his last start nine days ago, when he outdueled Justin Verlander, the Cardinals better escape from wherever they absconded to during Game 1 and actually show up.




Source: http://sports.yahoo.com/news/mlb--red-sox-rout-cardinals-in-game-1-of-world-series-032230773.html
Tags: columbus day   eagles   Robin Quivers   VMA Awards   dairy queen  

Daniel Cormier doesn't want to fight Alexander Gustafsson in Europe


An immediate fight against a top contender makes sense for Daniel Cormier's light heavyweight debut.


But a match in Europe against Alexeander Gustafsson is off the table, as far as DC is concerned.


On Wednesday's edition of UFC Tonight, the undefeated former Strikeforce Heavyweight Grand Prix tournament champion explained why he wants to have his first fight at 205 pounds here in the United States.


"I have no problem fighting Alexander Gustafsson, not at all," Cormier said. "The one thing I'm concerned about, being that its going to be my first time down at 205, I know that Gustafsson is going to fight in Europe somewhere. Whether it's Sweden or somewhere else in Europe, I don't want to be making my first weight cut down to 205 overseas. I know what I'm going to need, I want to find saunas here in the United States and all the food that I'm comfortable with in order to make the weight."


So with Gustafsson, one of the few names all but guaranteed to sell out a European arena, apparently a no-go, who does that leave? Several top light heavyweights already have matchups lined up. But among the bigger names without a dance partner are Phil Davis and Antonio Rogerio Nogueira.


"Those are all big fights," Cormier said. "These are the fights that matter. I'm going to need if I'm going to put myself in position to win the championship. I want to fight for the title, man. That was the reason I went. I thought that was going to be my first fight. It doesn't seem that way, in the division I've moved on. To me, L'll Nog, that makes a great fight. Any of those guys, I want a big fight."


Cormier also took a moment to reflect on an eventful night at UFC 166 on Saturday. Cormier scored a one-sided unanimous decision over Roy Nelson in the co-main event, then turned right around and cornered heavyweight champion Cain Velasquez for his fight with Junior dos Santos.


"Going into the Octagon and doing what I was supposed to do against Roy Nelson, that was a big part of my night," Cormier said. "But to go back in Cain Velasquez's corner go back watch my friend Cain Velasquez retain his title? That makes it something, man. Went back, threw my shirt on, and watched Cain put on a great show."


Source: http://www.mmafighting.com/2013/10/23/5022416/daniel-cormier-doesnt-want-to-fight-alexander-gustafsson-in-europe
Tags: zach mettenberger   harry potter   Chobani Recall   apple event   rosh hashanah  

Name that tune

Name that tune


[ Back to EurekAlert! ]

PUBLIC RELEASE DATE:

23-Oct-2013



[


| E-mail

]


Share Share

Contact: Catherine Crawley
ccrawley@nimbios.org
865-974-9350
National Institute for Mathematical and Biological Synthesis (NIMBioS)



Algorithm used in music retrieval systems applied to help identify dolphin whistles




The same algorithm used to find tunes in music retrieval systems has been successfully applied in identifying the signature whistles of dolphins, affording a new time-saving device for research into the world of dolphin communication.

Bottlenose dolphins, in particular, recognize each other by name: the sound of each animal's "signature" whistle, which each dolphin develops at a young age. Bottlenose dolphins appear to show preference to the signature whistles of familiar individuals. Scientists have found that dolphins use the signature whistles to foster and maintain group cohesion.

Until now, the classification of individual dolphin whistles has typically been done by examining a spectrograph, which visually represents the spectrum of frequencies found in a sound. But the method is time-consuming, requires more data than might be necessary, and is subject to human error.

A study, published Oct. 23 in the journal PLOS ONE, describes a new method for identification that uses an algorithm based on what's called the Parsons code, which has been used extensively in computerized retrieval of tunes from music databases. Instead of looking at the precise variation in frequency, the Parsons code only considers whether at each point in time the pitch goes up, down, or stays the same. The researchers examined 400 signature whistles from 20 different dolphins. The new algorithm did well at assigning signature whistles to individual animals, helping scientists to classify the tested whistles quickly and efficiently, according to the study.

"The Parsons code is a robust way to compare dolphins' signature whistles because it is able to home in on the variation in frequency that actually matters. It discards the information that isn't useful for the analysis," said lead author Arik Kershenbaum, a postdoctoral fellow at the National Institute for Mathematical and Biological Synthesis.

Being able to identify information in signature whistles is important for assessing the similarity of whistles and for studying how social behavior influences the development of these learned calls.

"Cetacean vocalizations are highly varied and presumably serve varied functions. So determining what aspects of the vocalizations hold information is crucial to be able to classify them and to be able to understand their meaning," Kershenbaum said.

###


Citation: Kershenbaum A, Sayigh LS, Janik VM. 2013. The encoding of individual identity in dolphin signature whistles: how much information is needed? PLOS ONE. http://dx.plos.org/10.1371/journal.pone.0077671

The National Institute for Mathematical and Biological Synthesis (NIMBioS) brings together researchers from around the world to collaborate across disciplinary boundaries to investigate solutions to basic and applied problems in the life sciences. NIMBioS is sponsored by the National Science Foundation, the U.S. Department of Homeland Security, and the U.S. Department of Agriculture with additional support from The University of Tennessee, Knoxville.




[ Back to EurekAlert! ]

[


| E-mail


Share Share

]

 


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.




Name that tune


[ Back to EurekAlert! ]

PUBLIC RELEASE DATE:

23-Oct-2013



[


| E-mail

]


Share Share

Contact: Catherine Crawley
ccrawley@nimbios.org
865-974-9350
National Institute for Mathematical and Biological Synthesis (NIMBioS)



Algorithm used in music retrieval systems applied to help identify dolphin whistles




The same algorithm used to find tunes in music retrieval systems has been successfully applied in identifying the signature whistles of dolphins, affording a new time-saving device for research into the world of dolphin communication.

Bottlenose dolphins, in particular, recognize each other by name: the sound of each animal's "signature" whistle, which each dolphin develops at a young age. Bottlenose dolphins appear to show preference to the signature whistles of familiar individuals. Scientists have found that dolphins use the signature whistles to foster and maintain group cohesion.

Until now, the classification of individual dolphin whistles has typically been done by examining a spectrograph, which visually represents the spectrum of frequencies found in a sound. But the method is time-consuming, requires more data than might be necessary, and is subject to human error.

A study, published Oct. 23 in the journal PLOS ONE, describes a new method for identification that uses an algorithm based on what's called the Parsons code, which has been used extensively in computerized retrieval of tunes from music databases. Instead of looking at the precise variation in frequency, the Parsons code only considers whether at each point in time the pitch goes up, down, or stays the same. The researchers examined 400 signature whistles from 20 different dolphins. The new algorithm did well at assigning signature whistles to individual animals, helping scientists to classify the tested whistles quickly and efficiently, according to the study.

"The Parsons code is a robust way to compare dolphins' signature whistles because it is able to home in on the variation in frequency that actually matters. It discards the information that isn't useful for the analysis," said lead author Arik Kershenbaum, a postdoctoral fellow at the National Institute for Mathematical and Biological Synthesis.

Being able to identify information in signature whistles is important for assessing the similarity of whistles and for studying how social behavior influences the development of these learned calls.

"Cetacean vocalizations are highly varied and presumably serve varied functions. So determining what aspects of the vocalizations hold information is crucial to be able to classify them and to be able to understand their meaning," Kershenbaum said.

###


Citation: Kershenbaum A, Sayigh LS, Janik VM. 2013. The encoding of individual identity in dolphin signature whistles: how much information is needed? PLOS ONE. http://dx.plos.org/10.1371/journal.pone.0077671

The National Institute for Mathematical and Biological Synthesis (NIMBioS) brings together researchers from around the world to collaborate across disciplinary boundaries to investigate solutions to basic and applied problems in the life sciences. NIMBioS is sponsored by the National Science Foundation, the U.S. Department of Homeland Security, and the U.S. Department of Agriculture with additional support from The University of Tennessee, Knoxville.




[ Back to EurekAlert! ]

[


| E-mail


Share Share

]

 


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.




Source: http://www.eurekalert.org/pub_releases/2013-10/nifm-ntt101613.php
Similar Articles: Demi Lovato   Eydie Gorme   Tim Hudson