GS-PAP 알고리즘과 볼테라 필터링을 이용한 비선형 반향 신호 제거

서재범(Jae-Bum Seo),김덕호(Duk-Ho Kim),김인숙,김경재,남상원(Sang-Won Nam) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1

In this paper, a nonlinear echo cancellation approach, based on a Gauss-Seidel pseudo affine projection algorithm and Volterra filtering, is proposed to compensate for echo path nonlinearity in the telephone network. Simulation results demonstrate that the proposed approach yields reduction of computational complexity and improved convergence speed than the conventional nonlinear echo cancellation methods (NLMS, ECLMS, FAP, RLS).

FBEGS-PAP 알고리즘 기반 볼테라 필터링을 이용한 비선형 반향신호 제거

徐在範(Jae-Bum Seo),金景在(Kyoung-Jae Kim),南尙沅(Sang-Won Nam) 대한전기학회 2007 전기학회논문지 Vol.56 No.2

In this paper, an efficient nonlinear echo cancellation method is proposed, whereby the fast block exact Gauss-Seidel pseudo affine projection (FBEGS-PAP) is further utilized for adaptive Volterra filtering. In particular, the proposed nonlinear echo cancellation approach requires lower computational complexity as in the conventional linear adaptive echo cancellation methods based on NLMS and GS-PAP, and still provides nonlinear echo cancellation performance similar to the GS-PAP method. Finally, echo cancellation performance of the proposed approach is demonstrated by providing some simulation results.

음향 피드백 경로를 가진 2차 볼테라 시스템의 능동소음제어

이정재(Jung-Jae Lee),김경재(Kyoung-Jae Kim),서재범(Jae-Bum Seo),남상원(Sang-Won Nam) 대한전기학회 2008 정보 및 제어 심포지엄 논문집 Vol.2008 No.1

In this paper, active noise control (ANC) of a Volterra system with a nonlinear secondary path is proposed in the presence of a linear acoustic feedback, whereby the conventional ANC of a linear system with online acoustic feedback-path modeling is further extended to ANC of a Volterra system with a linear acoustic feedback path. In particular, the proposed ANC system consists of two adaptive Volterra filters (for nonlinear noise control and nonlinear adaptive noise cancellation) and one feedback-path modeling filter. Simulation results show that the proposed approach yields more effective reduction of disturbances arising from the acoustic feedback, in addition to high nonlinear ANC performance.

발치 중에 발생한 성문하 이물 1례

최병권,김기식,권오성,서재범,이종빈,Choi, Byoung-Kwon,Kim, Ki-Sik,Kwon, O-Sung,Seo, Jae-Bum,Lee, Jong-Bin 대한기관식도과학회 2004 大韓氣管食道科學會誌 Vol.10 No.2

The lodgement of foreign material in the larynx is potentially life thereatening as complete obstruction of this region does not leave the individual with a viable airway. In the literature review, laryngeal foreign bodies accounted for about $3\%$ of the whole foreign bodies in the air passage. This report describes a rare case of laryngeal obstruction by subglottic foreign body(tooth) occurred during tooth extraction, in which repeated Heimlich maneuver failed to expel the foreign body and aggravated airway obstruction.

가능성 오일을 함유하는 폴리우레탄 마이크로캡슐의 제조 및 분석

김인회(In Hoi Kim),서재범(Jae Bum Seo),김영준(Young Jun Kim) 한국고분자학회 2002 폴리머 Vol.26 No.3

청소년 실태조사를 통한 청소년활동의 방향성 모색 - 경기도 청소년을 중심으로

권일남 ( Kwon Il Nam ),전명순 ( Jeon Myong Sun ),서재범 ( Seo Jae Bum ) 한국청소년활동학회 2021 한국청소년활동연구 Vol.7 No.1

배경 및 목적: 본 연구는 경기도 청소년의 청소년활동에 대한 실태조사를 바탕으로 청소년활동의 방향성을 모색하는 데 그 목적이 있다. 방법론/접근: 이를 위해 청소년 2153명을 대상으로 청소년의 활동참여정도와 수준에 대한 설문조사를 실시하였다. 결과/결론: 그 결과는 다음과 같다. 첫째, 청소년들의 청소년활동 참여수준에 있어서 연령에 따른 차이가 있었고, 청소년시설을 알게 된 경로는 친구와 선후배를 통해서가 많았고, 청소년동아리활동과 자원봉사활동, 일반적활동의 참여가 높게 나타났다. 둘째, 청소년시설의 아쉬운 점으로는 프로그램의 다양성, 지역을 대표할 수 있는 프로그램 부족, 홍보 부족으로 나타났다. 셋째, 청소년활동 참여가 의미있고 중요하다고 인식하는 것으로 나타났다. 넷째, 지역에서 제공해 주기를 원하는 활동에는 심리적 자존감을 높여주는 활동, 편안한 쉼과 여가를 즐기는 활동, 사회적 약자지원 청소년자원봉사활동에 대한 요구가 높았다. 다섯째, 성별, 연령, 지역에 따라 청소년시설에서 제공하는 활동영역에 대한 만족 기대가 달랐다. 여섯째, 지역에 만들어지기를 원하는 시설로는 진로체험중심의 시설과 스포츠특성화시설에 대한 필요를 가장 크게 요구하였다. 일곱째, 비대면으로 다양한 활동이 가능하지만, 필요 장비를 다루는 법, 비대면활동 개발방법에 어려움을 나타냈다. 또한, 경기북부와 경기남부의 청소년은 지역에 만들어지기를 원하는 시설(경기북부-스포츠 특성화시설, 진로체험 중심 특성화시설, 경기남부-녹음, 제작이 가능한 활동시설, 진로체험 중심 특성화시설)에서 차이를 보였다. 시사점: 이러한 결과로 경기도 청소년들의 활동 참여와 청소년활동의 방향성을 제시하였다. Background & Purpose: The purpose of this study is to find the direction of youth activities based on a survey on youth activities in Gyeonggi Province. Methodology/Approach: To this end, a survey was conducted on 2153 adolescents about the degree and level of their participation in activities. Findings/Conclusions: The results are as follow. First, there was a difference according to age in the level of youth participation in youth activities, and the channels to know youth facilities were through friends and seniors and juniors, and youth club activities, volunteer activities, and general activities were highly engaged. Second, the regrets of youth facilities were lack of diversity in programs, lack of programs that can represent the region, and lack of publicity. Third, it was found that participation in youth activities was recognized as meaningful and important. Fourth, the activities that the region wanted to provide were highly demanding for activities that enhance psychological self-esteem, activities that enjoy comfortable rest and leisure, and volunteer activities for the socially disadvantaged. Fifth, satisfaction expectations for the activity areas provided by youth facilities were different according to gender, age, and region. Sixth, as facilities that were desired to be built in the region, the need for career experience-oriented facilities and sports specialized facilities was most demanded. Seventh, it was possible to perform various activities non-face-to-face, but showed difficulties in how to handle necessary equipment and develop non-face-to-face activities. In addition, youths in northern Gyeonggi and southern Gyeonggi showed differences in the facilities they wanted to be built in the region. Implications: As a result of this, Gyeonggi-do youth's participation in activities and direction of youth activities were suggested.

파라콰트 중독 환자에서 예후 예측인자 및 혈액관류술의 효과

배기범,김성욱,손종원,서재석,오종택,도병훈,한승우,신병철,김신우,강영모,이종명,김능수 대한응급의학회 2002 대한응급의학회지 Vol.13 No.3

Purpose: Paraquat is a nonselective contact herbicide that may induce damage to many organs poisoned with it. Due to the high mortality associated with paraquat poisoning, a prediction of the outcome is a prerequisite for determining the therapeutic modality. Methods: To identify prognostic factors for paraquat poisoning, the authors analyzed retrospectively the clinical features and outcomes of 45 patients (mean age: 45.9 years, male-to female ratio: 1.1 : 1) poisoned with paraquat herbicides; they had been admitted to the emergency room of Kyungpook National University Hospital between June 1992 and June 2001. Results: Most patients (91.1%) ingested liquid paraquat concentrate; twenty-six (62%) patients had intended to commit suicide. The overall mortality rate was 64.4% (29 patients); the mortality rate with ingestion of more than two mouthfuls was 93.3%. Seventy-six percent of the fatal cases expired within 2 days after intoxication. Azotemia, hypokalemia, hypoalbuminemia, leukocytosis, and decreased level of arterial PaCO₂and bicarbonate on the first hospital day were significantly related with mortality. Increased level of serum AST on the 4th hospital day was an additional marker of mortality. The survival rates according to the Yamaguchi index were significantly different (A: 60%, B: 12.5%, C: 17%). There was no significant difference in the mortality rate between patients treated with and without hemoperfusion. Conclusion: Acid-base and electrolyte imbalances, an abnormal renal function, a low Yamaguchi index, and a positive urine paraquat test might be useful as early markers of poor prognosis. The effect of hemoperfusion remains to be determined by a further larger prospective study.

하악골 골절에 병발한 외이도 전벽 골절 2예

김보성,박윤근,김기식,서재범,최대섭,이종문 東國大學校醫學硏究所 2003 東國醫學 Vol.10 No.1

외상 후 2차적으로 발생한 측두골 골절은 많이 알려져 있으나, 중이나 내이의 손상 없이 외이도 전벽에 국한된 골절은 드물다. 외이도 전벽골절은 두부의 외상에 의한 측두골의 직접적 충격이나 하악골에 가해지는 충격에 의해 발생된다. 전형적인 증상으로는 이출혈, 전음성 난청, 개구장애가 있으며, 특히 하악골 골절 및 측두하악관절의 탈구가 동반되는 경우 개구장애, 부정교합 등의 장애를 람길 수 있으므로,, 초기에 적절한 치료를 요한다. 합병증으로는 그 외에도 외이도 협착 또는 폐쇄, 외이도 전주종, 측두하악관절의 기능장애, 윤활연골종 등이 보고되었다. 저자들은 하악골 골절 및 측두하악관절의 탈구를 동반한 외상성 외이도 전벽 골절 편위로 치험한 2예의 환자를 보고하는 바이다. Temporal bone fractures secondary to trauma have been well recognized, but localized fractures of anterior wall of the external auditory canal (EAC) without concurrent injury of middle or inner ear are rare. Direct impact to the temporal bone or mandible may result in anterior wall fracture of the EAC. The classic symptoms of the these fractures are bloody otorrhea, conductive hearing loss and trismus. Especially, EAC fractures associated with the mandibular fracture and dislocation of temporomandibular joint(TMJ) can result in various sequelaes such as trismus, malocclusion, and consequently early diagnosis and proper management is important. The reported complications of these fractures include EAC stenosis or atresia., EAC cholesteatoma, functional disability of TMJ, synovial chondromatosis. We report two patients with EAC fractures associated with the mandibular fracture and dislocation of TMJ.

허악골 골절에 병발한 외이도 전벽 골절 2예

김보성,박윤근,김기식,서재범,최대섭,이종문 약업신문사 1984 의약정보 Vol.10 No.1