Researchers develop a more accurate car navigation system

Researchers say new navigation system can be installed on any vehicle, including a Volkswagen Touareg.

(Credit:
Josh Miller/CNET)

Driverless cars could get a big boost from a new system that researchers say will increase the accuracy of in-car satellite navigation systems by 90 percent.

Researchers say the system combines conventional GPS signals with data from sensors such as accelerometers and gyroscopes to determine a vehicle's position within six feet of its location, a dramatic reduction from the current margin of error of 50 feet. The system can be installed inexpensively in any vehicle, say researchers at Spain's Universidad Carlos III de Madrid, where the system was developed.

"We have managed to improve the determination of a vehicle's position in critical cases by between 50 and 90 percent, depending on the degree of the signals' degradation and the time that is affecting the degradation on the GPS receiver," David Martín, a researcher at the Systems Intelligence Laboratory, said in a statement describing the project.

The system aims to tackle the greatest challenge faced by conventional GPS systems in urban settings: loss or disruption of satellite signal due to interference created by buildings, trees, and tunnels. The new system uses contextual information and an algorithm that eliminates deviations caused by degradation or loss of signal from satellites.

The researchers have installed a prototype system on an "intelligent
car" with the goal of capturing and interpreting all the information available while driving a car. The team sees applications of the system in driverless car systems currently under development by Google and a handful of automakers.

"Future applications that will benefit from the technology that we are currently working on will include cooperative driving, automatic maneuvers for the safety of pedestrians, autonomous vehicles or cooperative collision warning systems," the team said.

Ultimately, the team hopes to develop a system that harnesses the sensors built in to smartphones, such an accelerometer, a gyroscope, a magnetometer, and GPS, as well as taking advantage of communications tools such as Wi-Fi, Bluetooth, and GSM.

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Parents of slain Chicago teen attend State of the Union

Updated 12:20 a.m. EST Feb. 13

(CBS News) CHICAGO -- Among the First Lady's guests at the capitol Tuesday for the State of the Union address were the parents of Hadiya Pendleton. The 15-year-old honor student was shot to death, not far from the Obamas' Chicago home -- an innocent victim of the city's gang wars.

Hadiya Pendleton

On Tuesday, two suspects were ordered held without bail.

Chicago detectives flooded the area of the city park where Hadiya was killed last month. They were led to the suspects using surveillance video and interviews with parolees in the neighborhood. Alleged gang members, Michael Ward, 18, who police say has already confessed, and Kenneth Williams, 20, were picked up on Saturday night and charged on Monday.

"They thought the group they shot into included members of a rival gang. Instead, it was a group of upstanding, determined kids, who -- like Hadiya -- were repulsed by the gang lifestyle," said Chicago Police Superintendent Garry McCarthy.

Hadiya's parents, invited to the State of the Union in Washington, were relieved.

Watch: Hadiya Pendleton's mother told reporters her daughter's death "cannot be in vain," below.

"I can't close the book on my child, but I am very excited that the murderers who hurt my baby have been caught," said Cleopatra Cowley, Hadiya's mother.

Ward, the alleged triggerman, has a long criminal record, but the police noted that when he pleaded guilty to unlawful use of a firearm about a year ago, he was given probation and stayed free despite three subsequent arrests.

"This has to stop. Gun offenders have to do significant jail time," said McCarthy.

Tom Byrne, Chicago's chief of detectives, said Illinois' gun laws are undermined by a lack of mandatory minimum sentences for gun violations.

Hadiya Pendleton Update: No bail for two men charged in Chicago teen's shooting death
Before State of the Union, gun violence victims demand action
Accused Hadiya Pendleton killers denied bail

"If you get caught with a gun, and there's a minimum sentencing, you're gonna be off the streets for a while," Byrne said. "You're not gonna have the opportunity, within six months of being caught with a gun, to shoot somebody else."

If convicted in this case, the two suspects could face life in prison.

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State of the Union: Obama Pushes Job Creation

Pursuing an aggressive and diverse early second-term agenda, President Obama turned his focus Tuesday night squarely to the economy, using his State of the Union address to unveil new government initiatives aimed at creating jobs.

The defining duty of the new Congress and new administration is to "reignite the true engine of America's economic growth -- a rising, thriving middle class," Obama said Tuesday night from the House chamber.

"That must be the North Star that guides our efforts," he said.

Obama's proposals had a familiar ring, including re-packaged economic ideas but also offering several bold new measures aimed at boosting the middle class.

None of the proposals would add to the deficit "by a single dime," Obama pledged, with costs offset by savings carved out in the budget and from money saved from ending two wars.

"It's not a bigger government we need, but a smarter government that sets priorities and invests in broad-based growth," Obama said.

For the first time as president, Obama called for raising the minimum wage from $7.25 to $9.00 an hour by 2015. He proposed to ensure future increases by indexing the minimum wage to inflation.

He proposed a national goal of universal pre-school education, an effort to help states provide tens of thousands of low- to middle-income four-year-old children access to quality public education from an earlier age.

Charles Dharapak/Pool/AP Photo

Obama: A Rising Middle Class Should Be 'North Star' Watch Video

Obama Wants Minimum Wage: 'A Wage You Can Live On' Watch Video

Obama Announces Afghanistan Troop Withdrawal Watch Video

And, to heal the nation's crumbling roads and bridges, Obama offered a $50 billion "fix it first" infrastructure program that would prioritize repair of existing structures before building new ones.

"Every day, we should ask ourselves three questions as a nation," Obama said. "How do we attract more jobs to our shores? How do we equip our people with the skills needed to do those jobs? And how do we make sure that hard work leads to a decent living?"

Answers to those questions, the president suggested, include redoubling investments in clean energy technologies -- a step which he said would both benefit the environment and reduce U.S. dependence on foreign oil.

"For the sake of our children and our future, we must do more to combat climate change," he said.

He called for doubling the amount of renewable electricity generation in the U.S. by 2020, and announced an energy version of his "Race to the Top" education program that would give states grants for the best energy efficiency programs.

Related: 7 Things Obama Says at Every State of the Union

In tandem with his economic focus, Obama announced the withdrawal of 34,000 U.S. troops from Afghanistan by this time next year, cutting in half the current force and marking a quickened pace for the final exit of U.S. combat forces by a 2014 deadline.

There are currently 66,000 U.S. troops serving in Afghanistan. Obama has vowed to bring nearly all of them home by the end of next year, though a small contingent will likely remain to train Afghan forces and assist counterterrorism operations, officials have said.

Obama touched briefly on his recently-unveiled proposals to overhaul the nation's immigration system, expand rights for gay and lesbian Americans and curb an epidemic of gun violence.

With dozens of victims of gun violence looking on from the House gallery, including former Rep. Gabby Giffords, and families of victims from shootings at Newtown, Conn., Oak Creek, Wisc., and Aurora, Colo., Obama made an emotional plea for an up-or-down vote on his gun control plan.

"Each of these proposals deserves a vote in Congress," he said of proposed restrictions on assault-style weapons and high capacity magazines, and enhanced background checks, among other measures.

"If you want to vote no, that's your choice," he said. "But these proposals deserve a vote. Because in the two months since Newtown, more than a thousand birthdays, graduations and anniversaries have been stolen from our lives by a bullet from a gun."

Read More: President Obama's Past State of the Union Promises

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U.S. says to take lead to contain North Korea

SEOUL (Reuters) - U.S. President Barack Obama said North Korea's third nuclear test, in defiance of U.N. resolutions, was a threat and a provocation and that the United States would lead the world in responding.

North Korea has said Tuesday's test was an act of self-defense against "U.S. hostility" and threatened stronger steps if necessary.

"Provocations of the sort we saw last night will only isolate them further, as we stand by our allies, strengthen our own missile defense, and lead the world in taking firm action in response to these threats," Obama said in his State of the Union address, delivered 24 hours after the North's test.

North Korea tested nuclear devices in 2006 and 2009. But despite the three tests and a long-range rocket launch, it is not believed to be close to manufacturing a nuclear missile capable of targeting the United States.

But Washington believes the isolated state's ultimate aim is to design an intercontinental ballistic missile capable of carrying a nuclear warhead that could reach the continental United States. North Korea says its rocket program is aimed at putting satellites in space.

The latest test has drawn condemnation from around the world, including from China which for years has been the North's only major ally.

The U.N. Security Council held an emergency meeting at which its members, including China, "strongly condemned" the test and vowed to start work on appropriate measures in response, the president of the council said.

North Korean leader Kim Jong-un, the third member of his family to rule, has presided over two long-range rocket launches and a nuclear test during his first year in power, pursuing policies that have propelled his impoverished and malnourished country closer to becoming a nuclear weapons power.

North Korea said the test had "greater explosive force" than those in 2006 and 2009. Its KCNA news agency said it had used a "miniaturised" and lighter nuclear device, indicating it had again used plutonium, which is suitable for use as a missile warhead.

EXASPERATED

China, which has shown signs of increasing exasperation with the recent bellicose tone of its reclusive neighbor, summoned the North Korean ambassador in Beijing and protested sternly, the Chinese Foreign Ministry said.

Foreign Minister Yang Jiechi said China was "strongly dissatisfied and resolutely opposed" to the test and urged North Korea to "stop any rhetoric or acts that could worsen situations and return to the right course of dialogue and consultation as soon as possible".

Analysts said the test was a major embarrassment to China, which is a permanent member of the Security Council and North Korea's sole major economic and diplomatic ally.

Obama said the test would be a setback for North Korea's economic development.

"The regime in North Korea must know that they will only achieve security and prosperity by meeting their international obligations," he said.

U.S. ambassador to the United Nations Susan Rice said Washington and its allies intended to "augment the sanctions regime" already in place due to Pyongyang's previous atomic tests. North Korea is already one of the most heavily sanctioned states in the world and has few external economic links that can be targeted.

Japanese Prime Minister Shinzo Abe said the test was a "grave threat" that could not be tolerated.

Russian Foreign Minister Sergei Lavrov urged North Korea to abandon its nuclear arms program and return to talks. NATO condemned the test as an "irresponsible act."

South Korea, still technically at war with North Korea after a 1950-53 civil war ended in a truce, also denounced the test. Obama spoke to South Korean President Lee Myung-bak on Tuesday and told him the United States "remains steadfast in its defense commitments" to South Korea, the White House said.

MAXIMUM RESTRAINT

North Korea's Foreign Ministry said the test was "only the first response we took with maximum restraint".

"If the United States continues to come out with hostility and complicates the situation, we will be forced to take stronger, second and third responses in consecutive steps," it said in a statement carried by the KCNA news agency.

North Korea - which gave the U.S. State Department advance warning of the test - often threatens the United States and its "puppet", South Korea, with destruction in colourful terms.

North Korea told the U.N. disarmament forum in Geneva that it would never bow to resolutions on its nuclear program and that prospects were "gloomy" for the denuclearization of the divided Korean peninsula because of a "hostile" U.S. policy.

The magnitude of the explosion was roughly twice that of the 2009 test, according to the Vienna-based Comprehensive Nuclear-Test Ban Treaty Organization.

U.S. intelligence agencies were analyzing the event and found that North Korea probably conducted an underground nuclear explosion with a yield of "approximately several kilotons", the Office of the Director of National Intelligence said.

Nuclear experts have described the previous two tests as puny by international standards. The yield of the 2006 test has been estimated at less than 1 kiloton (1,000 tons of TNT equivalent) and the second at some 2-7 kilotons, compared with 20 kilotons for a Nagasaki-type bomb.

Initial indications are that the test involved the latest version of a plutonium-based prototype weapon, according to one current and one former U.S. national security official. Both previous tests involved plutonium. If it turns out the test was of a new uranium-based weapon, it would show that North Korea had made more progress on uranium enrichment than previously thought.

"VICIOUS CYCLE"

When Kim Jong-un, who is 30, took power after his father's death in December 2011, there were hopes that he would bring reforms and end Kim Jong-il's "military first" policies.

Instead, North Korea, whose economy is smaller than it was 20 years ago and where a third of children are believed to be malnourished, appears to be trapped in a cycle of sanctions followed by further defiance.

"The more North Korea shoots missiles, launches satellites or conducts nuclear tests, the more the U.N. Security Council will impose new and more severe sanctions," said Shen Dingli, a professor at Shanghai's Fudan University.

"It is an endless, vicious cycle."

Options for a response from the international community appear to be few. Diplomats at the United Nations said negotiations on new sanctions could take weeks since China is likely to resist tough new measures for fear they could lead to further retaliation by the North Korean leadership.

Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as Obama begins his second term.

The North's longer-term game plan may be to restart international talks aimed at winning food and financial aid. China urged it to return to the stalled "six-party" talks on its nuclear programme, hosted by China and including the two Koreas, the United States, Japan and Russia.

(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau and Michelle Nichols at the UNITED NATIONS; Fredrik Dahl in VIENNA; Michael Martina and Chen Aizhu in BEIJING; Mette Fraende in COPENHAGEN; Adrian Croft, Charlie Dunmore and Justyna Pawlak in BRUSSELS; Mark Hosenball, Paul Eckert, Roberta Rampton, Tabassum Zakaria and Jeff Mason in WASHINGTON; Editing by Raju Gopalakrishnan)

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Boxing: Botha claims offered US$155,000 to throw Williams bout

SYDNEY: Veteran South African boxer Francois Botha on Wednesday claimed he was offered A$150,000 (US$155,000) to throw his fight against Sonny Bill Williams, sparking an angry denial from the New Zealander's manager.

Williams, a former World Cup-winning All Blacks rugby star, won the controversial heavyweight bout on points in Brisbane last Friday, which was marred by unsubstantiated reports that Botha failed a drugs test.

Botha, 44, alleges Williams' manager Khoder Nasser offered him the money in a Brisbane park three days before the World Boxing Association fight, claiming he received a phone call asking to pick him up alone.

"I wasn't told where I was going. As we stopped at a park, my cellphone was confiscated and was given to a guy in the car," Botha told New Zealand's Radio LiveSport from Durban.

"Then I was being walked (by Nasser), and during this walk, I was offered A$150,000 to throw the fight.

"I just said 'no, I can't do it'."

There is no suggestion that Williams was aware of the alleged offer.

Nasser slammed Botha as a bad loser after a fight that ended in 10 rounds, despite earlier promotions saying it was a 12-round contest.

"I think he (Botha) is still in a daze," Nasser told Fairfax Media of a man who has fought Lennox Lewis, Mike Tyson, Wladimir Klitschko and Evander Holyfield in a 23-year career.

"This is the same bloke who said he didn't know about the fight being 10 rounds, and then his promoter and he himself came out later and said it was 10 rounds.

"Then he said he wasn't drugs tested and then he said he was tested. Then he said he was tested by my brother, and now he has come up with this one. What is next?

"He has got to come to terms with the reality that he got his ass whipped by a guy who had had only five fights.

"It is all well and good to come out with all these allegations after, but where's his manhood? It's absolute madness.

"If it happened like he said, why didn't he come out and report it then -- or does it suit him now?"

While Williams won the fight, he was on the receiving end of some heavy blows from Botha in the 10th round with the South African saying another two rounds would have been enough to secure him victory.

Bookmakers refunded bets on Williams's win due to the controversy over how long the fight was supposed to be.

Doubts have also been raised about whether the WBA actually sanctioned the bout, and if Williams' claim on the title is legitimate.

There was no WBA official present in Brisbane for the fight.

- AFP/al

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Surface Pro as a gaming rig? It's ready and able

Surface Pro run Valve's Portal 2 at close to max settings.

(Credit:
Valve)

Microsoft's new Intel-powered tablet isn't being advertised as a gaming platform, but maybe it should.

The Surface Pro handles Diablo III and Portal 2 at near-maximum settings, according to a post by Jason Evangelho at Forbes.com.

Gamers "represent an important -- and arguably sizable -- potential demographic for Microsoft. As the company knows from its wildly successful
Xbox platform," he wrote.

At the moment, Microsoft is marketing Surface as a business tool, with no mention of its gaming chops.

The closest it gets is ad copy about Intel's laptop-class Core i5 processor and the ability to run applications like Adobe Photoshop.

That Intel hardware makes it rare bird for a
tablet. With a few exceptions like the Samsung ATIV Smart PC Pro 700T, tablets today use either Intel's pokey Atom processor or -- relative to Intel's mainstream chips -- slower ARM processors.

Other specs lend the tablet to running games: it packs a fast solid-state drive (often used on gaming rigs) and 1,920x1,080 display.

"The Surface Pro handles Diablo III at 1920x1080 resolution with most specs except shadows maxed out," wrote Evangelho.

Not bad for a tablet.

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State of the Union guests reflect nation's hot-button issues

Several lawmakers are bringing special guests to President Obama's State of the Union address Tuesday night in order to make a statement.

Several lawmakers are bringing guests to help underscore the importance of gun control. More than 20 House Democrats are bringing guests who have been personally affected by gun violence. A bipartisan pair of Arizona lawmakers, meanwhile, will host former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly.

Other lawmakers are bringing guests tied to issues like immigration and voting rights.

Below is a partial list of officials and the guests they are bringing. CBS News will update the list as more guests are confirmed:

First Lady Michelle Obama:

• Lt. Brian Murphy, who was wounded while responding to the Sikh Temple shooting last August in Oak Creek, Wisconsin. He was struck by 15 bullets.
• Cleopatra Cowley-Pendleton and Nathaniel Pendleton Sr., parents of 15-year-old Hadiya who was killed in a Chicago park.
• Desiline Victor, a 103-year-old Florida woman who waited in line for several hours to vote.
• Tim Cook, CEO of Apple.

House Minority Leader Pelosi:

• Mother and daughter from Newtown, Conn. The 4th grader sent Pelosi a letter asking for her support to strengthen gun laws in the wake of the Sandy Hook massacre.

Sen. John McCain, R-Ariz., and Rep. Ron Barber, D-Ariz.:

• Former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly

Rep. Steve Stockman, R-Texas:

• Musician and gun advocate Ted Nugent

Sens. Richard Blumenthal, D-Conn., and Chris Murphy, D-Conn.:

• First Selectwoman Pat Llodra, a Republican and the Chief Executive Officer of Newtown
• Newtown Detectives Jason Frank and Dan McAnaspie, two of several first responders who rushed to Sandy Hook Elementary School on the day of the tragedy

Rep. Luis Gutierrez, D-Ill.:

• Undocumented immigrant Gabino Sanchez. The South Carolina husband and father of two U.S. citizen children is fighting deportation. Sanchez entered the country when he was 15 years old and has been working and living peacefully in the U.S. ever since.

Sen. Dianne Feinstein, D-Calif.:

• Josh Stepakoff, who in 1999 was shot at the North Valley Jewish Community Center in Granada Hills, Calif. Stepakoff, now 20, is a student at California State University Northridge.

Sen. Frank Lautenberg, D-N.J.:

• Matt Gross, a New Jersey native who was shot in the head in 1997, at the age of 27. Gross was one of several victims wounded during a shooting attack on the observation deck of the Empire State Building.

More House Democrats bringing guests affected by gun violence:

Rep. Jim Langevin, R.I.

Rep. Keith Ellison, Minn.

Rep. Carolyn McCarthy, N.Y.

Rep. Rosa DeLauro, Conn.

Rep. David Cicilline, R.I.

Rep. Diana DeGette, Colo.

Rep. Tammy Duckworth, Ill.

Rep. Elizabeth Esty, Conn.

Rep. Lois Frankel, Fla.

Rep. Lujan Grisham, N.M.

Rep. Janice Hahn, Calif.

Rep. Jim Himes, Conn.

Rep. Alan Lowenthal, Calif.

Rep. Gloria Negrete-McLeod, Calif.

Rep. Eleanor Holmes Norton, D.C.

Rep. Ed Perlmutter, Colo.

Rep. Jan Schakowsky, Ill.

Rep. Brad Schneider, Ill.

Rep. Bobby Scott, Va.

Rep. Mike Thompson, Calif.

Rep. Krysten Sinema, Ariz.

Rep. Chris Van Hollen, Md.

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North Korea Says it Has Conducted a Nuclear Test

North Korea says it has successfully tested a miniaturized nuclear device Tuesday, according to state media.

A large tremor measured at magnitude 4.9 was detected in North Korea and governments in the region scrambled to determine whether it was a nuclear test that the North Korean regime has vowed to carry out despite international protests.

Official state media said the test was conducted in a safe manner and is aimed at coping with "outrageous" U.S. hostility that "violently" undermines the North's peaceful, sovereign rights to launch satellites. Unlike previous tests, North Korea used a powerful explosive nuclear bomb that is smaller and lighter, state media reported.

President Obama called the test "a highly provocative act" in a statement Tuesday morning.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies,"Obama said.

"The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region," he added.

The U.N. Security Council will hold an emergency meeting on North Korea's nuclear test later this morning.

Suspicions were aroused when the U.S. Geological Survey said it had detected a magnitude 4.9 earthquake Tuesday in North Korea.

The Comprehensive Test Ban Treaty Organization told ABC News, "We confirm that a suspicious seismic event has taken place in North Korea."

North Korea Threatens More Nuclear Tests, Warns U.S. Watch Video

"The event shows clear explosion-like characteristics and its location is roughly congruent with the 2006 and 2009 DPRK (North Korea) nuclear tests," said Tibor Toth, executive secretary of the organization.

"If confirmed as a nuclear test, this act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation," Toth said in a statement on the organization's web site.

Kim Min-seok, a South Korean Defense Ministry spokesman, told reporters that North Korea informed United States and China that it intended to carry out another nuclear test, according to the AP. But U.S. officials did not respond to calls from ABC News Monday night.

The seismic force measured 6 to 7 kilotons, according to South Korea.

"Now that's an absolutely huge explosion by conventional terms. It's a smallish, but not tiny explosion by nuclear terms. It's about two-thirds the size of the bomb that the U.S. dropped on Hiroshima," James Acton, a Senior Associate at the Carnegie Endowment for International Peace, told ABC News.

North Korea threatened in January to carry out a "higher-level" test following the successful Dec. 12 launch of a long range rocket. At the time, North Korea's leader Kim Jong-Un said his country's weapons tests were specifically targeting the United States.

The suspicious tremor comes just hours before President Obama is to give the State of the Union address, and it marks the first diplomatic test in the region for new Secretary of State John Kerry.

Also, South Korea's new president, Park Geun-hye, is scheduled to be sworn in on Feb. 25. One of North Korea's biggest holidays, Kim Jong-il's birthday, falls on Feb. 16.

China, North Korea's main ally in the region, has warned North Korea it would cut back severely needed food assistance if it carried out a test. Each year China donates approximately half of the food North Korea lacks to feed its people and half of all oil the country consumes.

Both of North Korea's previous tests used a plutonium-based method for making bomb fuel. The first was deemed a failure, the second only slightly less so. If the most recent test used HEU (highly enriched uranium), a far more difficult-to-detect method of producing bomb fuel, it would be a significant and worrisome step forward for North Korea's weapons program.

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North Korea conducts third nuclear test, sparks condemnation

SEOUL (Reuters) - North Korea conducted its third-ever nuclear test on Tuesday, a move likely to anger its main ally China and increase international action against Pyongyang and its new young leader, Kim Jong-un.

U.N. Secretary-General Ban Ki-moon condemned North Korea's test, saying it was a "clear and grave violation" of U.N. Security Council resolutions.

South Korea said the size of the seismic activity indicated a nuclear explosion slightly larger than the North's two previous tests at 6-7 kilotons, although that is still relatively small. The Hiroshima bomb was around 20 kilotons.

The U.S. Geological Survey said that a seismic event measuring 5.1 magnitude had occurred on Tuesday, with North Korea later confirming the nuclear test.

"It was confirmed that the nuclear test that was carried out at a high level in a safe and perfect manner using a miniaturized and lighter nuclear device with greater explosive force than previously did not pose any negative impact on the surrounding ecological environment," KCNA said.

The test prompted the U.N. Security Council to call for an emergency meeting later on Tuesday and came as China celebrated the lunar new year, potentially increasing embarrassment for Beijing, the North's sole major economic and diplomatic ally.

"I think it will be proven to be a self-defeating and self-suffocating blunder on the part of the DPRK (Democratic People's Republic of Korea)," an Asian diplomat to the United Nations told Reuters in New York.

"They have chosen the worst timing to conduct this testing ... This will also be an open invitation to the international community to up the ante to corner the DPRK."

It may take days to ascertain whether the North used highly enriched uranium for the first time in the nuclear test, a move that would give it a second path to a nuclear weapon.

North Korea has used plutonium in previous tests and needs to conserve its stocks as testing eats into its limited supply of the material that could be used to construct a nuclear bomb.

The Vienna-based Comprehensive Nuclear-Test Ban Treaty Organization, the international atomic test monitor, said the event had hallmarks similar to the North's previous nuclear tests in 2006 and 2009.

"This act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation," it said.

Japan immediately called for sanctions against North Korea whose December long-range rocket launch prompted new U.N. sanctions that Pyongyang said earlier would push it to undertake a third nuclear test.

South Korea's defense ministry said additional nuclear tests and rocket launches by the North should not be ruled out.

South Korea's Yonhap news agency said Pyongyang had informed China and the United States of its plans to test on Monday.

When new leader Kim Jong-un took office after his father's death in December 2011, there were hopes the youthful leader would bring economic reforms and end his father Kim Jong-il's "military first" policies that have seen the North declare itself a "nuclear weapons state".

Since taking office however, he has purged the military, pushed ahead with two long-range rocket launches, which critics say breach U.N. sanctions.

Tuesday's action appeared to have been timed for the run-up to February 16 anniversary celebrations of Kim Jong-il's birthday, as well as to achieved maximum international attention.

But options for the international community appear to be in short supply, as North Korea is already one of the most heavily sanctioned states on earth.

Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as U.S. President Barack Obama begins his second term.

Japanese Prime Minister Shinzo Abe is bedding down a new government and South Korea's new president, Park Geun-hye, prepares to take office on February 25.

China too is in the midst of a once in a decade leadership transition to Xi Jinping, who takes office in March.

But the longer term game plan from Pyongyang may be to restart talks aimed at winning aide for its impoverished and stricken economy that is smaller than it was 20 years ago.

Its puny economy and small diplomatic reach means the North struggles to win attention on the global stage - other than through nuclear tests and attacks on South Korea, last made in 2010.

"Now the next step for North Korea will be to offer talks. They will either offer to restart six-party talks or military talks - any form to start up discussion again to bring things to their advantage," said Jeung Young-tae, senior research fellow at the Korea Institute for National Unification in Seoul.

(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau at the UNITED NATIONS; Editing by Michael Perry and Paul Tait)

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China support for N. Korea to survive nuke test: analysts

BEIJING: China is unlikely to punish troublesome ally North Korea harshly for Tuesday's nuclear test, analysts say, even though Chinese state media had warned the North of a "heavy price" if it went ahead.

There was no immediate official reaction to the test in Beijing -- China is in the middle of its biggest annual holiday, the Lunar New Year.

But after the North's rocket launch in December, China expressed "regret", while repeating calls for calm.

In recent weeks the state-run Global Times has issued strongly-worded editorials urging Beijing to take a tougher line on Pyongyang, saying it would have to pay dearly for another atomic test.

But China has long supported its unpredictable neighbour for fear that instability could bring refugees flooding across the border, a US-led military escalation in the region or even ultimately a unified Korea with a US military presence next door.

"I think that China is very angry about this test," said Stephanie Kleine-Ahlbrandt, Northeast Asia director of the International Crisis Group think tank.

She said she expected "stronger reactions" from the Communist Party's new leader Xi Jinping than his predecessors.

But she added: "We won't necessarily know about any punitive measures implemented by China, and they will not necessarily deter North Korea because China is only willing to go so far. Their main concern is stability in North Korea."

Chinese trade and aid allows the regime in Pyongyang to survive and pursue its nuclear programme.

At once important yet uncontrollable, North Korea poses a similar quandary for China as small-nation allies did for the US during the Cold War, said Wang Dong, a Northeast Asia expert at Peking University.

"You have small allies which are behaving in a very dangerous, aggressive and provocative way, potentially with the danger of driving the US into a conflict that it did not want to get into," he said.

"China is put in a very similar dilemma."

Beijing will probably respond with limited measures coordinated with other nations, perhaps to cut off financial access, Wang said. It would keep any unilateral measures under wraps to avoid antagonising Pyongyang.

In 2006 Beijing quietly reduced the oil supply upon which Pyongyang depends, two months after the regime fired a ballistic missile and one month before it tested its first nuclear bomb.

The move only emerged later when trade data revealed it -- and Beijing subsequently stopped publicising the figures.

"Of course it will not acknowledge that because they do not want to publicly humiliate North Korea," said Wang. "Face is something very much taken into consideration in international relations in East Asia."

Ahead of the blast, US envoy Glyn Davies said the US and China had "achieved a very strong degree of consensus" on North Korea while the head of the UN Security Council said its 15 members were "unified" on the matter.

But China has previously worked to soften international measures. It only agreed to a UN resolution condemning December's long-range rocket launch by Pyongyang after lengthy negotiations in which it opposed stronger sanctions.

It also diluted the UN response to North Korea's second nuclear test in 2009 and was not known to have taken any unilateral measures.

Even decisively punitive measures might fail to dissuade North Korea, which has persisted with its nuclear programme despite years of international isolation.

Pyongyang sees atomic arms as vital to its legitimacy and security, a view that may have been reinforced after the longstanding Kadhafi regime in Libya, which surrendered its nuclear weapons, fell to Western-backed rebels in 2011.

"They've drawn the conclusion that countries that give up their nukes get slammed," said Kleine-Ahlbrandt.

Given Pyongyang's doggedness, she said, Beijing's unwavering support for the regime has generated fierce debate among Chinese policy analysts, with some arguing that the relationship brings more liabilities than benefits.

But China's overriding strategic interest in avoiding instability means its support is likely to endure, said Sarah McDowall, a senior Asia analyst with the consultancy IHS Global Insight.

"Its overarching objective really is to ensure stability in the Korean peninsula," she said.

"The relationship is going to remain strong, and China will continue to take political and economic measures aimed at propping up and supporting the North Korean regime."

- AFP/ck

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