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남상범(Sang Beom Nam),윤덕미(Duck Mi Yoon),이윤우( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1
N/A Background: Idiopathic sudden sensorineural hearing loss(ISSHL) has been generally defined as an abrupt loss of auditory acuity without precipitating factors. Since ISSHL was first described as a disease entity, numerous reports assessing a variety of treatment regimens have been published. But its etiology, pathogenesis, treatment, and prognosis are controversial at the present time. Stellate ganglion block(SGB) has been used for the treatment of ISSHL by vasodilatation and increased blood flow to the inner ear. Methods: We reviewed the records of 152 patients to investigate the efficacy of SGB for ISSHL. the control group was managed with medications such as hypaque, heparin, steroid, nicotinic acid, and vitamins. The SGB group was managed with SGB and the same medications. SGB was performed with 8 ml of 1.0% mepivacaine. The efficacy of treatment was evaluated by pure-tone average following therapy. The recovery of hearing was defined as Siegels criteria I, II, or III. Results: The recovery rate of the SGB group was higher than that of the control group(61.5 vs. 42.9%, p<0.05). The recovery rate was higher in patients who were treated early, within 7 days from the onset of symptoms, especially in the SGB group(79.7%). And in the case that initial hearing loss was severe (>70dB), the SGB group had a higher recovery rate(64.2%) than the control group(42.5%). Conclusions: SGB is thought to be a useful therapy for ISSHL, especially in the patients who were treated soon after onset or whose initial hearing loss was severe.
남상범(NAM, Sangbum),김주현(KIM, Ju Hyun),신언교(SHIN, Eon Kyo) 대한교통학회 2018 대한교통학회지 Vol.- No.-
지금까지 신호교차로의 좌회전 운영 효율성 향상을 위한 많은 연구가 수행되어 왔다. 하지만 대향 직진 차로수와 교통량만을 고려한 분석으로 교차로의 운영 효율성을 판단했다. 신호교차로의 효율성 판단 시 신호시간이 중요한 변수임에도 불구하고 이를 고려하여 체계적으로 분석한 연구는 없었다. 이에 본 연구에서는 대향 직진 신호시간, 좌회전 신호시간 등의 신호 조건을 포함시켜 좌회전 처리방안(PRLT, PELT, PPLT)을 분석했다. 또한 조건 변화에 따른 상호관계를 고려하여 교차로에서의 효율적인 좌회전 처리방안을 제시하였다. 분석 결과 좌회전 신호시간이 10, 20초로 짧아서 혼잡한 경우는 PPLT 적용 후 PRLT보다 좌회전 지체시간이 크게 감소하였다. 반면에 좌회전이 혼잡하지 않은 30초의 경우는 PPLT 도입 효과가 크지 않은 것으로 분석되었다. 따라서 좌회전 혼잡이 큰 교차로일수록 PPLT 도입 필요성이 높으며 도입 효과도 클 것으로 판단된다. 차로별 대향직진 교통량과 좌회전 교통량, 신호시간(대향직진 신호시간, 좌회전 신호시간, 신호주기) 등을 조사하여 시뮬레이션 결과에 적용하면 효율적인 좌회전 처리방식인 PPLT와 신호시간 운영계획 수립에 활용될 수 있다. Many studies which considered volume and lanes of opposite straight traffic have been carried out to improve left-turn traffic flow at the signalized intersection. However, there were no studies reflect signal intervals which much influenced on the efficiency of the left-turn traffic flow. For the purpose of effective left-turn treatment, we considered signal intervals of the opposite straight traffic and left-turn traffic as well as the volume and lanes of opposite straight traffic. Based on the simulation results, left-turn delay of reduced significantly by the application of protected/permissive left-turn (PPLT) in case of congested left-turn traffic illustrated as left-turn signal time of 10 or 20second, but not as much as congested left-turn traffic in case of uncongested left-turn traffic such as left-turn signal time of 30second. Therefore, it is concluded that the heavier the left-turn traffic congestion, the greater the effect of protected/permissive left-turn (PPLT) in terms of reducing delay. Simulation results according to the variation of cycle length as well as the volume and signal interval of left-turn and opposite straight traffic can be used to find the best left-turn treatment among protected left-turn (PRLT), permissive left-turn (PELT) and protected/permissive left-turn (PPLT) at a signalized intersection.
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).
노이즈 파워 스케쥴링 기반 온라인 음향 피드백 경로 모델링을 이용한 멀티채널 능동 소음 제어
서재범(Jae Beom Seo),김경재(Jae Kyoung Kim),남상원(Sang Won Nam) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The performance of the ANC system can be degraded due to an acoustic feedback signal. To solve this problem, the conventional ANC system using an additive random noise for acoustic feedback path modeling. However, the additive noise signal can contribute to the residual noise. In this paper, multi-channel active noise control (ANC) of a linar system with online acoustic feedback path modeling (OFPM) is proposed along with noise power scheduling. In particular, the conventional single-channel linear ANC system with OFPM is further extended to a multi-channel ANC system with a linear acoustic feedback path. The proposed approach not only controls the additive random noise power, but also employs the OFPM using a variable step-size least mean square (VSS-LMS) algorithm to reduce the residual noise. Simulation results demonstrate the effectiveness of the proposed method.
GS-FAP 알고리즘 적용한 2차 볼테라 시스템의 능동 소음 제거
서재범(Jae-Beom Seo),김경재(Kyoung-Jae Kim),남상원(Sang-Won Nam) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
In this paper, a Gauss-Seidel fast affine projection (GS-FAP) algorithm developed for the linear active noise control (ANC) is further utilized for nonlinear ANC of a 2nd-order Volterra systems with a nonlinear primary path and a noisy secondary path. The simulation results, obtained by applying adaptive Volterra filtering, show that the proposed approach yields more stable and faster nonlinear ANC, compared with the conventional methods for the nonlinear ANC in case of noisy plant models.
NPVSS-NLMS 알·고리즘과 온라인 선형 피드백 경로 모델링을 이용한 비선형 능동 소음 제어
서재범(Jae-Beom Seo),남상원(Sang-Won Nam) 대한전기학회 2010 전기학회논문지 Vol.59 No.5
Acoustic feedback and background noise variation can degrade the performance of an active noise control (ANC) system. In this paper, nonlinear ANC using a non-parametric VSS-NLMS (or NPVSS-NLMS) algorithm and online feedback path modeling is proposed, whereby the conventional linear ANC with online acoustic feedback-path modeling is further extended to nonlinear Volterra ANC with a linear acoustic feedback path. In particular, the step-size of the NPVSS-NLMS algorithm is controlled to reduce the effect of background noise variation in the ANC system. Simulation results demonstrate that the proposed approach yields better nonlinear ANC performance compared with the conventional nonlinear ANC method.