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SAGE 알고리즘을 이용한 MIMO 채널 파라미터 추정과 분석
김주석,여봉구,최홍락,김경석,Kim, Joo-Seok,Yeo, Bong-Gu,Choi, Hong-Rak,Kim, Kyung-Seok 한국인터넷방송통신학회 2017 한국인터넷방송통신학회 논문지 Vol.17 No.5
본 논문은 다중 경로 다중입력 (Multiple-input multiple-output : MIMO) 채널에서 space alternating generalized expectation-maximization(SAGE) 알고리즘을 이용하여 채널 파라미터 추정 성능을 확인한다. 성능을 비교하기 위해 781 대역의 제주도 측정지역에서의 채널 파라미터로부터 시변 채널 환경 채널 파라미터 추정을 SAGE 알고리즘을 통해 추정하고 원본 데이터와 비교한다. 이를 통해 SAGE 알고리즘의 성능을 확인할 수 있으며 일반적인 파라미터 계산보다 SAGE 알고리즘을 통해 추정하는 것이 지연 확산(Delay Spread), 도래각 확산(Arrive of Angular Spread)이 적어 정확 측면에서 성능이 뛰어나고 안정적이다. This paper is a multi-input multi-path (Multiple-input multiple-output: MIMO) using a space-alternating generalized expectation maximization(SAGE) algorithm in the parameter channel and determine the channel estimation performance. Estimated by the algorithm, SAGE time-varying channel environment, the channel parameters estimated from the parameters of the channel measured in the island region 781 of the band in order to compare the performance and compares the original data. This allows you to check the performance of the algorithm SAGE and is highly stable to delay spread (Delay Spread), the diffusion angle of arrival (Arrive of Angular Spread) performance in terms of accuracy down through the SAGE algorithm for estimating a more general calculation parameters.
양태선(Yang Tae-Seon),박홍신(Park Hong-Shin),민경호(Min Kyoung-Ho),여봉구(Yeo Bong-Gu) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
Generally in harbor construction, constructivity of pump dredger method which very much depends on soil clay layers conditions is one of the main factors applying dredging work period. However, to densify the evaluation of dredging capability of pump dredger considering soil conditions is a main task in dredging projects. After studying the results of pump dredging cases on some port projects around the country, data of Korea standard for pump dredger are needed to collect actual results and a pump dredging capability table is prepared for future workss and soil data, also.
양태선 ( Yang Tae-seon ),박흥신 ( Park Hong-shin ),민경호 ( Min Kyoung-ho ),여봉구 ( Yeo Bong-gu ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
Generally in harbor construction, constructivity of pump dredger method which very much depends on soil clay layers conditions is one of the main factors applying dredging work period. However, to densify the evaluation of dredging capability of pump dredger considering soil conditions is a main task in dredging projects. After studying the results of pump dredging cases on some port projects around the country, data of Korea standard for pump dredger are needed to collect actual results and a pump dredging capability table is prepared for future workss and soil data, also.
경사식 방파제 상부구조물 작용 수평파력 산정식 비교 사례 연구
오상호(Sang-Ho Oh),오영민(Young Min Oh),여봉구(Bong-Gu Yeo),한태영(Tae-Young Han) 한국연안방재학회 2014 한국연안방재학회지 Vol.1 No.1
This study investigated the applicability of four empirical equations (Morihira et al., 1967; Goda, 2010; Jensen, 1984 and Bradbury et al., 1988; Pedersen, 1996) suggested for estimating the horizontal wave force on the crown wall of sloping breakwaters. For the two exemplary cross sections of the breakwaters whose geometry are apparently different each other, the estimates of horizontal wave force calculated by the four equations were compared. The values of estimated wave force showed considerable discrepancy among the equations for each of the two exemplary breakwater cross sections, respectively. In addition, the relative magnitude of the wave force was quite different according to the breakwater geometry as well as the design wave condition. In general, Morihira’s or Goda’s formulae produced larger estimates of the horizontal wave force than Jensen/Bradbury’s or Pedersen’s formulae if the wave period (or wavelength) is comparatively short. In contrast, exactly opposite result was obtained when the wave period or wavelength is comparatively long. Further detailed study based on physical experiments is required to examine the applicability of the four empirical equations considered in this study more thoroughly.