선천성 보흐다레크 횡격막 탈장 - 대한소아외과학회 회원 대상 전국 조사 -

김재천,김대연,김상윤,김성철,김인구,김재억,김해영,김현영,박귀원,박우현,박진영,백홍규,서정민,송영택,오수명,이남혁,이두선,이명덕,이석구,이성철,정상영,정성은,정연준,정을삼,정풍만,Kim, Jae-Chun,Kim, D.Y.,Kim, S.Y.,Kim, S.C.,Kim, I.K.,Kim, J.E.,Kim, H.Y.,Kim, H.Y.,Prak, K.W.,Prak, 대한소아외과학회 2006 소아외과 Vol.12 No.1

This is a survey on congenital posterolateral diaphragmatic hernia, conducted by the Korean Association of Pediatric Surgeons(KAPS). A registration form for each patient during the 5-year-period between 1998 and 2002 and a questionaire were sent to each member. Twenty-ninemembers in 22 institutions returned completed forms. The average number of patients per surgeon was 1.4 cases a year. The male to female ratio was 1.64: 1, and annual incidencewas 1/14,522 live births. In this review, factors influencing survival in congenital posterolateral diaphragmatic hernia were age at admission, birth weight, time of antenatal diagnosis, birth place, Apgar score, onset time of symptoms and signs, preoperative cardiopulmonary resuscitation, associated anomalies of themusculoskeletal system, central nervous system, or chromosomes, preoperative stabilization, levels of preoperative $FiO_2$, pH, and $AaDO_2$, perioperative complications, bilaterality of defect, size of the defect, and presence or absence of hernia sac.

바이올린과 첼로 연주 데이터를 이용한 분류 알고리즘의 성능 비교

김재천,곽경섭,Kim Jae Chun,Kwak Kyung sup 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.5C

음악인식에 주로 사용되는 세 가지 알고리즘의 성능을 비교하였다. 다양한 분류알고리즘을 소개하고 그 중 베이지안법, 최근접이웃법과 k-최근접이웃법을 이용하여 악기를 분류하였다. 악기 샘플파일에서 영교차율, 평균, 분산, 평균피크레벨의 4가지 특성값을 추출하여 분류시스템의 데이터로 사용하였다. 사용된 악기 샘플은 바이올린, 바로크 바이올린, 바로크 첼로이다. 실험결과 최근접이웃 알고리즘이 악기 분류에 있어서 가장 좋은 성능을 보여 주었다. 최근접이웃 알고리즘은 단순하면서도 빠른 계산결과를 보여 악기 분류에 적절한 알고리즘으로 판단되었다. Three classification algorithms are tested using musical instruments. Several classification algorithms are introduced and among them, Bayes rule, NN and k-NN performances evaluated. ZCR, mean, variance and average peak level feature vectors are extracted from instruments sample file and used as data set to classification system. Used musical instruments are Violin, baroque violin and baroque cello. Results of experiment show that the performance of NN algorithm excels other algorithms in musical instruments classification.

바이올린 음원을 이용한 스펙트랄 롤오프 포인트의 최적점 검출

김재천,Kim, Jae-Chun 한국컴퓨터정보학회 2007 韓國컴퓨터情報學會論文誌 Vol.12 No.1

음악을 분류하기 위해 특성함수를 사용하여 추출한 특성값 벡터를 사용한다. 본 실험에서는 특성값 벡터를 추출하기 위해 스펙트랄 롤오프, 분산, 평균 피크레벨을 사용하였다. 이중에서 스펙트랄 롤오프는 저음프레임과 고음프레임의 상대적인 비를 나타낸다. 최적의 롤오프 포인트를 찾기 위하여 롤오프 포인트를 0.05에서 0.9까지 0.05간격으로 증가시키며 반복실험 하였다. 롤오프 포인트를 증가시키며 분류성공률을 관찰하였다. 그리고 실험에 사용된 음원데이터는 바로크바이올린과 현대바이올린 연주이다. 두 종류의 악기는 모양과 주파수대역에 있어서 유사하지만 약간의 대역차와 질감의 차이를 가지고 있다. 이러한 특성이 최적의 롤오프 포인트를 찾는데 유용할 것으로 판단하였다. 실험결과 롤오프 포인트 0.85에서 가장 높은 분류성공률 85%를 나타냈다. Feature functions were used for the classification of music. The spectral roll-off, variance, average peak level, and class were chosen to make up a feature function vector. Among these, it is the spectral roll-off function that has a low-frequency to high-frequency ratio. To find the optimal roll-off point, the roll-off points from 0.05 to 0.95 were swept. The classification success rate was monitored as the roll-off point was being changed. The data that were used for the experiments were taken from the sounds made by a modern violin and a baroque one. Their shapes and sounds are similar, but they differ slightly in sound texture. As such, the data obtained from the sounds of these two kinds of violin can be useful in finding an adequate roll-off point. The optimal roll-off point, as determined through the experiment, was 0.85. At this point, the classification success rate was 85%, which was the highest.

항문직장기형 - 수술 후 관리 및 기능적 결과 -

김재천,Kim, Jae-Chun 대한소아외과학회 2006 소아외과 Vol.12 No.1

Postoperative management of anorectal malformation consists of colostomy management and then management after definitive surgery. Colostomy management requires attention to certain details, i. e. complete decompression of the distal limb to avoid secondary megarectosigmoid and prevention and treatment of urinary tract infections in patients with rectourethral fistula. Management after definitive surgery requires the care of catheters placed in the rectourethral fistula or cloacal defect. Prevention and treatment of various complications after definitive operation, i. e. wound infection, anal stenosis or stricture, anal mucosal prolapse, and management of functional disorders, i.e. constipation, fecal incontinence and urinary incontinence are also necessary. In this review, recent trends for the prevention and treatment of the above mentioned problems after operation for anorectal malformation are presented.

소아 충수염에 대한 임상적 고찰

정성후(Sung Hoo Jung),김재천(JaeㆍChun Kim) 대한외과학회 1986 Annals of Surgical Treatment and Research Vol.30 No.3

Detection of the Optimum Spectral Roll-off Point using Violin as a Sound Source

김재천(Kim Jae Chun*) 한국컴퓨터정보학회 2007 韓國컴퓨터情報學會論文誌 Vol.12 No.1

음악을 분류하기 위해 특성함수를 사용하여 추출한 특성값 벡터를 사용한다. 본 실험에서는 특성값 벡터를 추출하기 위해 스펙트랄 롤오프, 분산, 평균 피크레벨을 사용하였다. 이중에서 스펙트랄 롤오프는 저음프레임과 고음프레임의 상대적인 비를 나타낸다. 최적의 롤오프 포인트를 찾기 위하여 롤오프 포인트를 0.05에서 0.9까지 0.05간격으로 증가시키며 반복 실험 하였다. 롤오프 포인트를 증가시키며 분류성공률을 관찰하였다. 그리고 실험에 사용된 음원데이터는 바로크바이올린과 현대바이올린 연주이다. 두 종류의 악기는 모양과 주파수대역에 있어서 유사하지만 약간의 대역차와 질감의 차이를 가지고 있다. 이러한 특성이 최적의 롤오프 포인트를 찾는데 유용할 것으로 판단하였다. 실험결과 롤오프 포인트 0.85에서 가장 높은 분류성공률 85%를 나타냈다. Feature functions were used for the classification of music. The spectral roll-off, variance, average peak level, and class were chosen to make up a feature function vector. Among these, it is the spectral roll-off function that has a low-frequency to high-frequency ratio. To find the optimal roll-off point, the roll-off points from 0.05 to 0.95 were swept. The classification success rate was monitored as the roll-off point was being changed. The data that were used for the experiments were taken from the sounds made by a modern violin and a baroque one. Their shapes and sounds are similar, but they differ slightly in sound texture. As such, the data obtained from the sounds of these two kinds of violin can be useful in finding an adequate roll-off point. The optimal roll-off point, as determined through the experiment, was 0.85. At this point, the classification success rate was 85%, which was the highest.

장간막낭종

김재천(Jae-Chun Kim) 대한외과학회 1987 Annals of Surgical Treatment and Research Vol.32 No.5

오바마 행정부의 출범과 미국의 대 한반도 안보정책 함의

김재천 ( Jae Chun Kim ) 서울대학교 미국학연구소 2009 미국학 Vol.32 No.1

유주비장의 염전

김재천(Jae-Chun Kim),최광석(Kwang-Seak Choi) 대한외과학회 1988 Annals of Surgical Treatment and Research Vol.34 No.1

오바마 행정부의 출범과 미국의 대 한반도 안보정책 함의

김재천 ( Jae Chun Kim ) 서울대학교 미국학연구소 2009 미국학 Vol.32 No.2

Making of US foreign policy is expected to undergo no small amount of change as new Democratic President, Barack Obama has taken the office. US foreign policy will take a turn for a more Liberal Internationalist approach under the Democratic Obama administration, and Obama`s policy toward Asia and Korean peninsula will proceed under the broad framework of Liberal Internationalist foreign policy tradition of the Democratic Party. During the Bush administration Asia did not receive a fair share of attention from the US, because the US had been largely preoccupied with Iraq. It is expected that strategic importance of Asia to the US will loom larger under the Obama administration. President Obama will attempt to maintain peace and order in Asia by preserving and strengthening traditional alliances and partnerships. Additionally, his administration will strive to adjust to new regional trends towards multilateralism. Obama`s inauguration is unlikely to change basic tenets of Korea-US alliance. The decision to strengthen and upgrade the alliance partnership had been arrived at by previous administrations in both countries after lengthy discussion for a long period of time. Obama administration is not in a position to ignore this consensus without any apparent reasons. Obama acknowledges that Korea-US alliance has been a remarkably strong and successful one and that ties that bind the two countries proved to be very resilient. In the spirit of upgrading Korea-US alliance from defense-based one to a more value-based, future oriented one, the new administration in the US will ask Korea to expand alliance responsibility and join in efforts to counter terrorism in Afghanistan. It is speculated that Obama might adopt a more diplomatic and friendlier approach to North Korea and problems associated with North Korea. But if Obama thinks that diplomatic options are exhausted and North Korea does not reciprocate American goodwill and refuses verifiable dismantlement of nuclear weapons, it should not come as a surprise to see Obama`s policy toward North Korea revert to that of early George W Bush.