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12 Şubat 2010 Cuma

Marjah fight geared for Afghan civilians' safety

Paylaş
KABUL, Afghanistan — The battle for Marjah is to be a key test of the strategy of the U.S.-led coalition to hammer Taliban radicals and persuade Afghans to help keep the jihadists out, military officials say.


"The difference is this operation is structured to protect civilians," Maj. Gen. Zahir Azimi, a spokesman for Afghanistan's Defense Ministry, said Thursday.



Marjah is a town of about 80,000 people in the Taliban's southern stronghold of Helmand province. Under the Taliban's control for months, Marjah is the subject of one of the largest military operations in Afghanistan since the invasion of the country in 2001.



Thousands of U.S. and Afghan troops have ringed the town. A U.S.-Afghan force led by the U.S. Army's 5th Stryker Brigade moved south from Lashkar Gah and linked up with Marines on the northern edge, closing off a possible escape route.



Two U.S. attack helicopters fired Hellfire missiles at a compound near Marjah where insurgents had fired at the advancing Americans.



The plan calls for the Afghan government to quickly re-establish control and bring jobs and security to the region, said Air Force Lt. Col. Todd Vician, a military spokesman in Kabul.



The U.S. military sacrificed the element of surprise in announcing the attack on Marjah to protect the townspeople and not alienate those who may be thinking of abandoning the Taliban.



Thursday, Afghanistan's interior minister, Hanif Atmar, met with a group of tribal elders to explain the goals of the operation and ask for their support.



"This operation is designed to open the way for those Afghans who want to join the peace process and to use the military power against those foreign terrorists who are hiding here," Atmar told the elders during a meeting in Lashkar Gah, the Helmand provincial capital about 20 miles northeast of Marjah.



The elders told Atmar their support depended on how the operation was carried out and whether a large number of civilians were killed or injured. One elder, Mohebullah Torpatkai, said that if the operation improved civilians' lives, "we the people of Marjah will fully support it."



Azimi said intelligence suggests the Taliban will avoid a major confrontation and attempt to slip the noose. Fighters who have joined the Taliban for money rather than jihadist ideology will be encouraged to lay down their arms and remain, he said.



There are indications the message is being received.



"Groups along the edge of the city are already telling Marines, 'Hey, we're ready for you guys to come in,' " said Marine Col. Paul Kennedy, who commands a regiment that will come to Helmand as part of a surge of U.S. forces ordered by President Obama. "These guys would have to be idiots to try to go toe to toe."



Marjah is crisscrossed by canals, which makes movement difficult and favors defenders. Azimi said the insurgents have probably seeded the area with roadside bombs.



"This may be the largest IED threat and largest minefield that NATO has ever faced," said Brig. Gen. Larry Nicholson, commander of Marines in southern Afghanistan.



Marjah is important because the town, like other locales in Helmand province, is a source of income for the Taliban, according to the Pentagon.



Helmand province is where much of Afghanistan's poppy crop is grown. The plant is used to make opium for heroin. Afghanistan is the world's largest producer of opium, and money from the drug trade helps bankroll the jihadist movement, according to the State Department.



Marines moved into the province last year and cleared Taliban fighters from most small villages and towns in Helmand. Many Taliban members retreated to Marjah, creating a dangerous mix of insurgents, criminals and drug traffickers, the Pentagon said.



"Marjah has to be cracked open," Marine Gen. James Conway said in December.



Azimi said that once coalition forces are victorious, Marjah can be kept safe by Afghan soldiers.



"We have enough forces in the area to maintain long-term security," Azimi said.



Bill Clinton gets two stents in heart artery

Paylaş
WASHINGTON — Former president Bill Clinton had two stents placed in a clogged heart artery Thursday after he complained of chest discomfort, his cardiologist said.


Clinton, 63, "is in good spirits, and will continue to focus on the work of his foundation and Haiti's relief and long-term recovery efforts," Douglas Band, counselor to the former president, said in a statement. Clinton recently returned from a trip to Haiti.



The nation's 42nd president underwent a quadruple heart bypass operation in 2004.



Allan Schwartz, Clinton's cardiologist, said the procedure went smoothly and Clinton may be released from the hospital today.



Clinton showed no evidence of having had a heart attack, Schwartz said at NewYork-Presbyterian Hospital/Columbia University Medical Center. He said Clinton is in "excellent health" and is ready to resume "his very active lifestyle."



Secretary of State Hillary Rodham Clinton left for New York to be with her husband, aides told the Associated Press. They said she plans to go ahead with a scheduled trip this weekend to Qatar and Saudi Arabia. She left for New York shortly after a White House meeting with President Obama. The aides spoke on condition of anonymity to discuss matters concerning the former president's health.



Cardiologists said Clinton's latest health problems should come as no surprise.



"It's very common five to seven years after bypass surgery for a vein graft" to clog, just as native arteries do, said Steven Nissen, chief of cardiology at the Cleveland Clinic. The leg veins commonly used in bypass surgery are structurally different and tend to fail more quickly, Nissen said.



Doctors often fix the problem by inserting stents, springlike devices that prop the artery open. Once a stent is put in place, the chest pain goes away.



Usually, patients are released from the hospital within 24 to 48 hours and can resume normal activities within a few days.



The fix, Nissen said, is likely to be temporary. "Once you have coronary artery disease, it tends to recur," he said.



After his bypass surgery, Clinton developed complications that required a surgery on one lung several months later because of a buildup of fluid and scar tissue. He did not have a heart attack during either of those episodes.



Obama called Clinton to wish him a speedy recovery, the White House said.



Former president George W. Bush, who is working with his predecessor on the Haiti relief fundraising drive, spoke with Chelsea Clinton on Thursday "and was glad to hear that her father is doing well," Bush spokesman David Sherzer said.



Former Clinton spokeswoman Dee Dee Myers joked that it was nice of Clinton to "inject a change of topic" into the news after all the coverage of the East Coast snowstorms. "No one I've talked to around him is very alarmed. The guy works so hard, and a lot of people ... are going to have to look at his schedule and dial it back around the edges."

3 House retirements spur debate on whether Republicans are losing momentum

Paylaş
A trio of House Republican retirement announcements over the past 10 days have sparked a debate between the leaders of the two major parties over whether the GOP is losing momentum in its quest to score major gains at the ballot box this fall.



With the three latest lawmakers choosing not to seek reelection in November, Republicans will have to defend 18 open seats and Democrats 14. The raw numbers contradict the conventional wisdom that Democrats would head for the sidelines after GOP Sen. Scott Brown's special election victory Jan. 19 in Massachusetts.



GOP strategists are brushing aside the retirement gap, saying that many of their House members see an improving political environment and are jumping ship to run for statewide office, and that other retirements are occuring in mostly conservative terrain that will be easy to defend. Democrats counter that the GOP retirements are a sign that most rank-and-file Republicans do not believe they will recapture the majority anytime soon.

National Republican Congressional Committee Chairman Pete Sessions (Tex.) said that "not all retirements are created equal," adding that Democratic retirements are coming in far less friendly territory for the majority. "The fact of the matter is Democrats in swing districts are retiring because they know what November has in store for them," Sessions said.


"The fact that you have 10 percent of House Republicans retiring suggests they don't believe their own hype about taking back the House," said Rep. Chris Van Hollen (Md.), chairman of the Democratic Congressional Campaign Committee. "If that was a realistic prospect, people would be running for office, not from it."

Leaving the House


On Thursday, Rep. Lincoln Diaz-Balart (R-Fla.) became the latest casualty, announcing that he would not seek a 10th term in his Miami area seat. Less than 24 hours earlier, Rep. Vernon J. Ehlers (R-Mich.) had decided not to run again, and, late last month, Rep. Steve Buyer (Ind.) also called it quits. (Technically, Democrats could make the argument that there have been 19 GOP retirements because Rep. Mario Diaz-Balart (R-Fla.) is moving into his brother's neighboring district and running for that seat. That leaves the southwestern Florida district, which is viewed as a more ripe target for Democrats.)


At this early stage of the campaign season, independent political handicappers Charlie Cook and Stuart Rothenberg predict Democratic losses of at least 20 seats, putting Republicans halfway to the 40 they need to take back the majority. The ripest targets are often seats left behind by incumbents, and a look at the 31 open seats does suggest that Democrats are likely to be harder hit by the retirements.


Of the 14 Democratic open seats, Sen. John McCain (R-Ariz.)carried five in the 2008 race for the White House and lost one -- Kansas's 3rd District -- narrowly. Of the 18 Republican-held seats, President Obama won two and came close in the districts held by Lincoln and Mario Diaz-Balart around Miami.


Seeking higher office

Two-thirds of the GOP retirees, 12, are running for higher office, a sign, party strategists say, that Republicans view their party as ascendant and are leaping at opportunities.


In addition, the most recent retirees -- Buyer, Diaz-Balart, Ehlers -- are veterans whose upward mobility is limited in the House. Buyer, who faces ethics questions from his home-state media about a foundation he operates, is at the end of his term limit as the top Republican on the Veterans' Affairs Committee. Ehlers recently gave up his top post on the House Administration Committee. Lincoln Diaz-Balart is a senior member of the powerful Rules Committee, which governs much of the business of the House, but that position is selected by Minority Leader John A. Boehner (R-Ohio), who has two close allies on that panel who are viewed as more likely to become chairman if Republicans reclaim the majority.


Watching every seat

Still, Republicans would rather not have to deal with open seats. Modern political history suggests that open seats are far more likely to switch parties than those in which the incumbent is running for reelection -- meaning that any vacant seat has at least the potential to become competitive.

"In this environment, every open seat has to be watched, and there will be GOP open seats where the NRCC will have to spend money they wouldn't have had to if the incumbent had run for reelection," said Carl Forti, a Republican consultant and former communications director for the House GOP's campaign arm. "This will take away from what they have to spend on offensive opportunities."



Although Republicans are on a winning streak after Brown's victory and the seizure of the New Jersey and Virginia governors' offices in November, the party continues to face a deficit when compared with Democratic finances. At the end of January, the NRCC had $4.1 million in the bank after posting more than $4.5 million raised last month. The Democratic Congressional Campaign Committee, by contrast, had $16.7 million on hand at the end of 2009. The DCCC has not released its January figures.

In addition, some Republican primaries have turned bitter, with the burgeoning tea party movement viewing these open seats as a chance to flex its muscle against candidates whom it considers establishment-backed. It's unclear whether such outsider conservatives will emerge in the South Florida primaries, but the tea party allies have adopted former Florida state House speaker Marco Rubio as a favorite son in his insurgent Senate primary against Gov. Charlie Crist (Fla.).


Patrick Kennedy won't run for re-election

Paylaş
Rhode Island Democratic Rep. Patrick Kennedy will retire after eight terms in office, bringing an end to his House career just months after his father, legendary Massachusetts Sen. Ted Kennedy, passed away.


"My father instilled in me a deep commitment to public service," Kennedy said in a video announcing his retirement. "Now having spent two decades in politics, my life has taken a new direction and I will not be a candidate for re-election this year."

Kennedy has easily held Rhode Island's 1st district since 1994 despite the occasional attempt by Republicans to knock him off.

Kennedy's time in Congress was decidedly uneven. He was rumored to be planning a Senate bid in 2000 but decided against running. He was tasked with chairing the Democratic Congressional Campaign Committee in that same cycle with expectations within the party that they would seize back control of the House. It didn't happen.

After his stint at the DCCC, Kennedy took on a far less high-profile role in Congress -- emerging only infrequently and not always in the best light. In the spring of 2006 Kennedy crashed his car into a police barricade near Capitol Hill; he entered rehab for addiction and depression days later. Over the summer, Kennedy admitted himself to a rehabilitation facility again.

Patrick Kennedy's retirement means that for the first time in nearly five decades there will not be a member of the Kennedy family in Congress. His father, who served Massachusetts in the Senate for more than four decades, died on August 25.

Kennedy's seat, which includes the northeastern reaches of the state, is strongly Democratic. President Barack Obama won the seat by 32 points in 2008 while Sen. John Kerry (Mass.) carried it by 26 points in 2004.

Among the Democrats mentioned as possible Kennedy replacements include: Providence Mayor David Cicilline, Lt. Gov. Elizabeth Roberts and state party chairman Bill Lynch.

State Rep. John Loughlin was already in the race on the Republican side.

Kennedy is the 14th Democrat to announce his retirement plans this cycle. Eighteen Republicans are retiring while Rep. Mario Diaz-Balart is giving up his 25th district seat to run in for the 21st district being vacated by his brother -- retiring Rep. Lincoln Diaz-Balart.



8 Şubat 2010 Pazartesi

ABD bu kasabaya ambargo uyguluyor

Paylaş
ABD artık nüfus cüzdanında Yağlıdere yazanlara vize vermiyor...




Sabah gazetesinin haberine göre ABD'ye yolladığı göçmen sayısı nüfusunu aşan Yağlıdere ilçesi halkına artık gizli vize ambargosu var...



Giresun'un Yağlıdere ilçesinin ABD'yi 'keşfi' 1960'larda başladı. İlçeye bağlı Hisarcık köyünde yaşayan Rum asıllı Lefter adlı kişi 4 yıl ABD'de kaldıktan sonra 1964'te yakınlarını görmek için ilçeye geldi.



ABD'ye dönerken de iş bulduğu arkadaşı İzzet Eküz'ü yanında götürdü. İşte o yıllarda atılan göç tohumları büyüdükçe büyüdü. Kuşaktan kuşağa geçerek ilçeden binlerce kişinin ABD'ye kapağı atmaya çalışmasıyla inanılmaz boyutlara ulaştı.



Göç 1985-2000 arasında zirve yaptı. 15 yıl boyunca her yıl yaklaşık 500 Yağlıdereli ABD'ye gitti ve dönmedi. Bu durum ABD'li yetkililerin de dikkatini çekti. Sonunda Yağlıdere'ye 'örtülü ambargo' uygulanmaya başladı. 2000 yılından sonra gidişler zorlaştırıldı, 2005'ten sonra ise neredeyse imkânsız hale geldi.



'NÜFUSA BAKILIYOR'



Bu ambargonun en somut örneklerinden birini, yıl içinde ABD'ye giden Yağlıdere Belediye Başkanı Abdurrahman Kırhasanoğlu yaşadı. Kırhasanoğlu, "Konsolosluktaki görevli, vize işlemlerimi yaparken nüfus kağıdımda Yağlıdere'yi görünce bana baktı. Sebebini sorunca, 'Nüfus kağıdında Yağlıdere yazanları görünce kulaklarımızı dikiyoruz' cevabını verdi. Giden dönmediği için ABD artık bu ilçeyi fişledi" dedi. Yağlıdereliler'in ABD'ye gitmek için her yolu denediğini vurgulayan Kırhasanoğlu, "Mesela ikametgâhlarını başka kentlerde gösteriyorlar. Kütüğünde Yağlıdere yazsa bile, 'Orada oturmuyorum' diyerek, vize ambargosunu aşmaya çalışıyorlar. Bu şekilde ikametgâhını değiştirenlerin sayısı yüzlerle ifade edilebilecek düzeyde. İlçede ABD hayali ilköğretim çağında başlıyor" diye konuştu. Eskiden okuryazar olmasa bile vizesini cebine koyan Amerika'ya gidiyordu. Artık en az lise mezunu olmak, bir işyerinde 2 yıl sigortalı çalışmak gibi şartlar aranmaya başladı. Yağlıdere'den 2009'da 4, 2007'de 2, 2008'de ise sadece 1 kişiye vize çıktı. 2000 yılından bu yana toplam 100 kişi, ABD vizesi alabildi.



KIRTASİYELER BÜRO



Yağlıdereliler ABD'de petrol ve inşaat sektörlerinde şirketler kurdu. Yağlıdere'de hemen herkesin en az bir yakın akrabası Amerika'da. Her yıl tatile gelen Yağlıdereliler, ilçelerine yaklaşık 10 milyon dolar bırakıyor. Vizeye kısıtlama gelmesi, gençleri göçmenlik başvurularına yöneltmiş. Gökhan Gökmen, kırtasiye dükkanında, yılda yaklaşık bin tane ABD Göçmen Formu dolduruyor. Bazıları da kaçak yollara başvuruyor, umut tacirlerinin eline düşüyor.

1 Şubat 2010 Pazartesi

BBC’de seks skandalı

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BBC’nin bir yapımcısının 2005 ve 2008 yılları arasında birlikte olduğu kadınların görüntülerini gizlice çektiği ortaya çıktı




İngiliz BBC yayın kuruluşunda yapımcı olarak çalışan Benjamin Wilkins, çoğu BBC’nin üst düzey yöneticileri ve sunucuları olan 10’dan fazla kadınla yaşadığı yatak odası maceralarını gizli kameraya çekmekten hapis cezasıyla karşı karşıya.

Wilkins’in aynı zamanda çocuğunun da annesi olan sevgilisinin, çeşitli kadınların seks kayıtlarından oluşan bir kutu DVD’yi tesadüfen bularak polise haber vermesiyle ortaya çıkan olay herkesi şoke etti. Çalışma arkadaşları, “güvenilir ve sevilen biri” olarak tanımladıkları Wilkins’ten böyle bir şey beklemediklerini ifade etti.

Polisin yaptığı açıklamada, Wilkins’in biri yatak odasındaki yangın alarmına saklı, diğeri banyosunda yer alan toplam 2 kamerayla 50 saatten fazla çekim yaptığı, görüntülerdeki kadınların bundan haberdar olmadığı bildirildi.



2 yıl ceza alabilir

Gizli kamera görüntülerini internette yayınlamadığı sanılan Wilkins’in 2005 ile 2008 arasında 6 değişik kadını içeren 10 ayrı röntgencilik suçunu itiraf etmesinin ardından 2 yıla kadar hapis cezası alabileceği belirtildi.

Babası da BBC’de tanınan bir kameraman olan Wilkins, gözaltına alındığı 2008 Ağustos ayında istifa etmişti. BBC’den adını açıklamayan bir kaynak, genç yapımcının çapkın biri olmadığı söyleyip “İyi bir sesi vardı ve iyi bir spikerdi, BBC’de çok iyi bir kariyeri olabilirdi ancak bunu çöpe attı” yorumunu yaptı.

Wilkins’in cezasının bu ay içinde kesinleşmesi beklenirken BBC sözcüsü hukuki süreç tamamlanmadığı için bu konuda görüş bildirmesinin uygun olmayacağını belirtti.



1 Şubat tarihi neden önemli

Paylaş
Bugün güneş tutulması ya da olağanüstü bir olay yaşanmayacak; ancak dünyada çok nadir olarak görülen bir matematik olayı bu tarihte görülüyor. İşte 1 Şubat tarihinin sırrı...





ABD’de bulunan Portland Üniversitesi’nde Elektrik Mühendisliği profesörü olan ve yıllardır kendi alanında önemli çalışmalarda bulunan Türk bilim insanı Aziz İnan, sayıları çok seviyor ve sayılar üzerinde sayısız çalışması bulunuyor.



Bulduğu vakitlerde sayılar üzerinde araştırmalar yapan İnan, ay/gün/yıl tarih yazılımı sistemi üzerindeki çalışmalarıyla ABD’de büyük ses getirdi. Başta USA Today ve Los Angeles Times olmak üzere ABD’nin önde gelen gazetelerinde makaleleri yayınlanan İnan, Palindrom olarak da bilinen tarih yazılımı sistemi üzerinde uzun yıllardır çalışıyor.





Palindrom nedir

Sayı ve harflerin tersten okunuşu da aynı olan cümle, kelime veya sayılara denir. Örneğin 323, 6336, 7895987 veya Kak, Kaçak, İki palindrom sistemine örnek olarak gösterilebilir.





1 Şubat tarihi neden önemli

Palindrom sistemine göre bakıldığında 1 Şubat tarihini gün/ay/yıl sistemiyle yazdığımızda 01.02.2010 tarihine ulaşıyoruz.



Bu rakamları bir araya getirdiğimize 01022010 sayısına ulaşıyoruz ki dikkat edeceğiniz üzere rakamlar tersten bakıldığında da aynı değeri veriyor.



İşin ilginç yanı aa/gg/yy sistemini kullanan (ay önce, gün sonra) Kanada ve ABD’yi hesaba katmazsak tüm dünyada tercih edilen tarih sisteminde (gg/aa/yy) rakamların bu yansıma olayı oldukça nadir olarak görülüyor.



Örneğin bir önceki Palindrom günü 10 Şubat 2001 tarihinde (10.02.2001 / 10022001) görülmüştü. Ve işin daha da ilginç yanı, 10 Şubat 2001 tarihinden önce Palindrom günü 809 yıl önce, yani 29-11-1192 (29111192) tarihinde görülmüştü ve o tarihten 2001 yılına kadar Palindrom gün görülmemişti.



Türkiye’nin tarih sistemine göre bakıldığında bu yüzyılda toplamda 29 adet palindrom gün bulunuyor ve 1 Şubat 2010’dan sonraki palindrom günü 11 Şubat 2011 tarihinde (11022011) görülecek.





Bu yüzyılda yaşanacak palindrom günlerinin ilk 5 tanesi ise şöyle:

- 11.02.2011 -



21.02.2012 -



02.02.2020 -



12.02.2021 -



22.02.2022



Bu yüzyılda görülecek 29. palindrom gün ise 29 Şubat 2092 yani 29.02.2092 tarihinde bulunuyor.





Aziz İnan kimdir

15 Mayıs 1955 yılında İstanbul'da dünyaya gelen Aziz İnan, Elektrik Mühendisliği bölümünden mezun oldu ve ABD'de bulunan Portland Üniversitesi'nde öğretim üyesi kimliğiyle görev aldı. USA Today, Los Angeles Times, Chicago Tribune, Denver Post, Boston Globe, Seattle Times gibi ABD'nin önde gelen gazete ve yayınlarda makaleleri yayınlanan İnan, palindrom sistemi üzerindeki çalışmalarıyla tanınıyor.



25 Ocak 2010 Pazartesi

O’Brien Undone by His Media-Hopping Fans

Paylaş


Conan O’Brien made a triumphant exit from NBC Friday night, accompanied by one of the most impressive outpourings of support by younger viewers that any late-night host had ever seen — and Mr. O’Brien was effusive in his thanks for their backing.
But he might have said: Where were you when I needed you?

In the tumult that surrounded NBC’s late-night shake-up last week, one thing was certain: If even a small fraction of the additional younger viewers who flocked to Mr. O’Brien’s show last week had turned up regularly in his earlier ratings results, he would almost surely still be hosting “The Tonight Show.”

Instead, for most of this past fall, Mr. O’Brien struggled to command the young viewers he needed to counter a falloff in overall audience numbers.

While he began to drop behind his chief late-night competitor, David Letterman on CBS, among total viewers, it was more alarming to NBC that Mr. O’Brien was not consistently beating Mr. Letterman in several important advertising-sales demographic groups — viewers 18 to 49 and 25 to 54. (He did beat Mr. Letterman virtually all the time in the 18-to-34 group.)

But to NBC’s surprise and disappointment, Mr. O’Brien fell behind his predecessor, Jay Leno, even among those 18-to-34 viewers, the group expected to be his core constituency. (From his start in June through the end of 2009, Mr. O’Brien averaged 716,000 viewers in that age group, down from the 759,000 Mr. Leno averaged the previous six months.)

Several television researchers said in interviews that this outcome might have been easily predicted, not because Mr. O’Brien does not appeal to younger viewers — he clearly does, as evidenced by the large numbers he attracted for his closing shows — but because regularly assembling those young adult viewers in significant numbers in the late-night hours has become a daunting, if not impossible, task.

“The 18-to-34 group is so difficult to attract and the lower half, 18 to 25, is the hardest of all,” said Jack MacKenzie, the president of the millennial strategy program for the research firm Frank N. Magid Associates.

Compounding the problem, said a senior research executive for another company, was the fact that Mr. O’Brien was especially appealing to young men. “And that group doesn’t watch television very regularly,” said the executive, who asked not to be named because his business competes with NBC.

Instead of watching Mr. O’Brien most nights, Mr. MacKenzie said, those young viewers have been watching everything from similar shows like “The Colbert Report” on Comedy Central, to cartoons on the “Adult Swim” franchise on the Cartoon Network, and the ever-present array of sports and sports news on ESPN and its sister channels.

In comparison with the 719,000 viewers in the 18-to-34 group that Mr. O’Brien had been averaging, Stephen Colbert on his “Colbert Report,” in the same six- month period in 2009, averaged 746,000 viewers ages 18 to 34. The cartoons on “Adult Swim” — mostly “Family Guy” and “Robot Chicken” — averaged 619,000 of those viewers. ESPN from 11 p.m. to 1 a.m., with varied programs that included both live sports events and editions of the highlights show “Sports Center,” averaged 614,000 viewers in that group.

And dozens of other cable channels took other slices of the under 35 viewers.

“What you’ve seen in recent years is increased spending by all these cable channels for original programming,” Mr. MacKenzie said. “And besides having a double revenue stream of subscription fees and advertising, the cable channels have the luxury of targeting specific audiences. Broadcasters don’t.”

Fans of sports, for example, were watching ESPN many nights instead of Mr. O’Brien; and cartoon lovers were hooked on “Adult Swim.”

But even all the competition on cable did not represent the total distraction for young viewers that Mr. O’Brien had to contend with. The senior research executive pointed to outside attractions like video games that vie for the attention of young, especially male, viewers. And CBS executives have in the past identified the growing tendency of owners of digital video recorders to use the time after late local newscasts to play back programs recorded earlier that night or on previous nights.

A spokeswoman for Nielsen Media Research pointed to a study the company released last year that cited the peak hours for DVR playback. The late-night hours showed the highest percentage of playback outside the prime-time hours, with about 7.6 percent of playback taking place from 11 p.m. to 12 a.m.

As an executive from one of NBC’s rival networks put it: “Conan didn’t just have to worry about Letterman; he had to worry about ‘House.’ People are playing back episodes of shows like ‘House’ in late night.”

Add to all the other issues the fact that Mr. O’Brien’s young fans did not really have to watch television to see him. His shows were made available later on Web sites like Hulu. And his best comedy bits would frequently be posted on other sites — and passed around by fans — shortly after they appeared.

Mr. MacKenzie added that NBC did Mr. O’Brien no favor by moving Mr. Leno to the 10 p.m. hour this fall. “That meant there was a show very similar in style to his on the air before him,” he said.

In his run on “The Tonight Show,” Mr. Leno managed to attract the largest audiences in virtually every age group, though his ratings too showed signs of falling off in his later years on the show. But his was always the first show of the late-night talk variety on NBC each night, Mr. MacKenzie.

That will happen again when Mr. Leno returns to “The Tonight Show” on March 1. But Mr. MacKenzie had some words of caution for NBC.

“A generational switch is coming,” he said. “The baby boomer audience that has mostly been the Leno audience is going out. The Conan audience is becoming more influential — even if they aren’t watching television the same way the previous generation did.”