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잡음 채널 환경에서 강인한 분산형 데이터 추정치 획득 알고리즘
백인혜(In-Hea Baek),김두용(Du Yong Kim),Nga-Viet Nguyen,Vladimir Shin 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-
분산 형 추정 융합의 경우, 획득된 각 노드들의 추정들은 잡음 채널을 통하여 중앙 프로세서로 전달된다. 전달 된 각 노드들의 추정치들을 융합하기 위해 일반적으로 최적 선형조합 기법을 적용한다. 하지만 실제 응용 상황에서는 채널잡음이 heavy-tail일 경우 이와 같은 기법의 적용이 불가능하다. 따라서 이와 같은 문제는 다른 기법의 알고리즘으로 교체되어야 할 필요가 있다. 본 논문에서는 채널잡음을 다루기 위하여, 강인성을 지닌 알고리즘의 한 방법인 M 추정기법을 고려하였다. 하지만 이는 로컬 추정치 간에 연관성이 높아질 경우 추정치의 정확성이 떨어지게 되므로, 트림 아웃라이어의 방법을 이용하여 알고리즘의 강인성을 제시하고 차후 이를 최종 융합에 적용하였다. 제시된 알고리즘 기법이 기존의 M 추정기법 보다 정확성이 높다는 것과 특히, 상관관계가 높아질수록 정확성이 증가함은 실험을 통하여 입증 하였다. In distributed estimation fusion, locally obtained estimates are transmitted to the central processor via noisy channels. Traditionally, optimal linear methods are applied to solve the fusion problem under Gaussian noise assumption that can be severely violated in practice when channel noises are heavy-tailed. Hence, those methods should be replaced by robust analogs. M-estimates are well-known robust tools; however, when there is considerable correlation between local estimates, fusion accuracy may decrease. Thus, we propose a robust fusion algorithm based on a procedure for trimming outliers and the subsequent application of an optimal fusion method. Numerical experiments show that the proposed method is more accurate than conventional M-estimates, especially when there is a high degree of correlation involved.
송일영(Il-Young Song),윤주홍(Ju-Hong Yoon),김두용(Du-Yong Kim),김용훈(Yong-Hoon Kim),신 블라디미르(Vladimir Shin) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 연구는 94 ㎓ 대역의 polarimetric 라디오미터를 이용하여 도로 노면에 대한 특성을 측정, 분석하기위하여 아스팔트 시료를 대상으로 실험하였다. 도로 노면을 젖은 상태 또는 결빙상태로 가정하여 두 편파 모드에 대한 밝기 온도를 측정하였다. 실험 결과 도로 노면의 상태에 따라 밝기온도의 차이가 큰 것으로 나타났다. 이는 실제 도로면의 상태를 측정하는 정보로서 도로면의 밝기온도 정보를 측정하는 것이 효율적임을 입증한다. An experimental study aiming at detecting different road conditions (Wet and Ice) by means of 94 ㎓ dual-channel polarimetric radiometer has been conducted in open-air laboratory using a sample of asphalt as target. The brightness temperature is measured at horizontal and vertical polarization for different road surface conditions. The measurements carried out on the target have pointed out that a 94 ㎓ band polarimetric radiometer is able to judge the different states of the road surface.
전립선비대증 환자에서 Alfuzosin, Doxazosin, Tamsulosin 단독요법과 Finasteride의 병합요법의 효과비교
김두용,김한석,김택상,최성,류현열 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.1
Background : The aim of this study was to evaluate the efficacy of alpha-blocker monotherapy and alpha-blocker plus finasteride combination therapy for the treatment of benign prostatic hyperplasia(BPH) and the rate of surgery for acute urinary retention or resistance to medical therapy. Materials and Methods : From Jan. 2000 to Jan. 2004, 284 symptomatic BPH patients had taken alfuzosin only, doxazosin only, tamsulosin only, alfuzosin+finasteride, doxazosin+finasteride and tamsulosin+finasteride. 18 patients had taken alfuzosin only, 25 doxazosin only, 34 tamsulosin only, 62 alfuzosin+finasteride, 60 doxazosin+finasteride, and 85 tamsulosin+finasteride. The mean age of the patients was 65.9±9.6 years. The mean follow-up time was 7.4±4.2 months, 10.5±6.4 months, 7.0±5.6 months, 10.3±5.6 months, 10.6±6.8 months, and 9.6±8.5 months each. IPSS (international prostatic symptom score), QOL (quality of life) index, PSA, and TRUS were checked at first visit. IPSS and QOL index monthly follow-up were done. The response was assessed by measurement of IPSS and QOL index. The cases of acute urinary retention and surgery for resistance to medical therapy were included in this study. Results : The mean age of alfuzosin group is 62.2±8.2 years, doxazosin is 65.5±10.5 years, tamsulosin is 64.9±10.4 years, alfuzosin+finasteride is 66.7±9.4 years, doxazosin+finasteride is 68.1±9.0 years, and tamsulosin+finasteride group is 66.0±9.5 years. The mean PSA of patients is 1.45±0.89ng/dl, 1.63±1.00ng/dl, 1.58±1.26ng/dl, 1.63±1.00ng/dl, 1.83±1.09ng/dl, and 1.75±1.13ng/dl. The mean weight of prostate is 35.8±18.1gm, 29.6±9.8gm, 33.5±14.8gm, 39.8±18.1gm, 35.5±10.0gm, and 35.1±12.0gm. The change of IPSS after medication in six groups is 17.5±7.7 to 8.5±6.2, 17.5±4.8 to 9.8±4.0, 16.6±8.1 to 8.3±6.3, 17.9±7.6 to 10.4±7.5, 17.8±4.8 to 10.1±8.1, and 16.8±6.6 to 10.8±7.5. The change of QOL index is 3.6±1.1 to 2.3±1.1, 3.4±0.7 to 2.5±0.9, 3.4±1.0 to 2.4±1.1, 3.6±1.4 to 2.5±1.3, 3.7±1.2 to 2.5±1.3, and 3.6±1.1 to 2.7±1.2. (P<0.05). The rate of surgery for acute urinary retention or resistance to medical therapy is 11.1%, 8.3%, 11.7%, 9.6%, 6.6%, and 9.4%. Conclusions : IPSS and QOL index are statistically improved in all of six groups after medical therapy but, no statistical difference between efficacy of alpha-blocker monotherapy groups and alpha-blocker plus finasteride combination therapy groups was found. And no statistical difference was found in the rate of inevitable surgery also. Monotherapy with Alpha-blocker is effective to improve low urinary tract symptom due to BPH. It will be necessary to make a long-term study about the efficacy of finasteride later.
전립선 비대증 환자에서 Alfuzosin, Doxazosin 단독요법 및 Finasteride를 포함한 병합요법의 효과비교
김두용,류현열 KOSIN UNIVERSITY COLLEGE OF MEDICINE 2006 高神大學校 醫學部 論文集 Vol.21 No.1
Background: The aim of this study was to evaluate the efficacy of alpha-blocker monotherapy and alpha-blocker + 5-alpha-reductase inhibitor combination therapy for the treatment of benign prostatic hyperplasia and the rate of surgery for acute urinary retention or resistance to medical therapy. Methods: From Jan. 2000 to Jan. 2004, one hundred sixty five symptomatic BPH patients had taken alfuzosin only, doxazosin only, alfuzosin + finasteride, and doxazosin + finasteride. Eighteen patients had taken alfuzosin only, 25 doxazosin only, 62 affuzosin + finasteride, 60 doxazosin+finasteride. The mean follow-up time was 7.4±4.2 months, 10.5±6.4 months, 10.3±5.6 months, and 10.6±6.8 months each. International prostatic symptom score (IPSS), quality of life (QOL) index, PSA, and TRUS were checked at first visit. IPSS and QOL index monthly follow-up were done. The response was assessed by measurement of IPSS and QOL index. The cases of acute urinary retention and surgery for resistance to medical therapy were included in this study. Result: The mean age of alfuzosin group is 62.2±8.2 years, doxazosin is 65.5±10.5 years, alfuzosin+finasteride is 66.7±9.4 years, and doxazosin+finasteride is 68.1±9.0 years. The mean PSA of patients is 1.45±0.89ng/dl, 1.63±1.00ng/dl, 1.63±1.00ng/dl, and 1.83±1.09ng/dl. The mean weight of prostate is 35.8±18.1gm, 29.6±9.8gm, 39.8±18.1gm, and 35.5±10.0gm. The change of IPSS after medication in four groups is 17.5±7.7 to 8.5±6.2, 17.5±4.8 to 9.8±4.0, 17.9±7.6 to 10.4±7.5, and 17.8±4.8 to 10.1±8.1. The change QOL index is 3.6±1.1 to 2.3±1.1, 3.4±0.7 to 2.5±0.9, 3.6±1.4 to 2.5±1.3, and 3.7±1.2 to 2.5±1.3 (P<0.05). The rate of surgery for acute urinary retention or resistance to medical therapy is 11.1%, 8.3%, 9.6%, and 6.6%. Conclusion: IPSS and QOL index are statistically improved in all of four groups after medical therapy but, no statistical difference was found between the efficacy of alpha-blocker monotherapy groups and those of alpha-blocker plus finasteride combination therapy groups. The comparison of rates of inevitable surgeries in each groups were also not different statistically. Monotherapy with Alpha-blocker is effective to improve low urinary tract symptom due to BPH. It will be necessary to make a long-term study about the efficacy of finasteride later.
성병주,김성주,김한석,김두용,김택상,류현열 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.1
Adrenocortical carcinoma ranks among the least common malignant endocrine tumors, accounting for 0.02% of all annual cancers reported in USA. Given the generally advanced stage at diagnosis, the overall 5-year survival remains poor varying between 20 and 45%. Recently we treated a case of testosterone producing adrenocortical carcinoma. Here we report a case of a functioning adrenocortical carcinoma in a woman with a review of the relevant literature.