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이근상,백용현,박영철,Lee, Keun-Sang,Baek, Young-Hyun,Park, Young-Chool 대한의용생체공학회 2010 의공학회지 Vol.31 No.2
A method of measuring heart rate using photoplethysmograph(PPG) signal during exercise is proposed. PPG's are composed of strong base tones and their harmonics, and the strong base tones are trackable by the adaptive notch filter (ANF) which adjusts its coefficients to minimize the output power. The proposed heart rate measurement algorithm continuously notches the frequency component with the maximum power in the measured PPG, so that the fundamental frequency corresponding to heart rate is traced. We also presents methods of detecting degeneration and impulsive noise blocks to minimize the coefficient fluctuation. Experiments were conducted using real PPG signals captured during exercise. Results showed that the proposed algorithm is capable of consistently tracking the heart rate embedded in the noisy PPG's.
이근상,Lee, Keun-Sang 한국과학기술정보연구원 과학기술정보센터 2000 Journal of Information Science Theory and Practice Vol.31 No.4
최근 네트워크로 연결된 이기종의 유용성을 높이고 기존의 분산객체 컴퓨팅의 문제해결을 위해 이동 에이전트(Mobile agent)의 연구가 활발히 이루어지고 있다. 이런 연구를 통해 기존의 분산시스템뿐만 아니라 전자상거래, 네트워크관리, 정보검색 등 많은 분야에 이동 에이전트를 적용시키는 연구가 진행되고 있으며, 많은 시스템이 개발되고 있다. 본고에서는 에이전트의 연구에 있어 관련된 사항을 알아보고 에이전트간 통신기능향상을 위해 연구한 내용을 바탕으로 전반적인 내용을 다루고자 하며, 마지막으로 에이전트의 미래와 적용분야에 대해 다루고자 한다. Recently, researches of mobile agent systems have done actively to enhance usability of heterogenenous environment linked via network and to solve problems of existing distributed-object computing. Though these research and development many studies have done to be applicated to many areas that are existing distributed systems as well as E-commerce, network maintenance, and information retrieval etc. This paper reviews some related issues to agent studies, comprehensive studies to enhance telecommunication functionality among agents, and future and application fields of agent.
이근상,박영철,Lee, Keun-Sang,Park, Young-Cheol 한국정보전자통신기술학회 2015 한국정보전자통신기술학회논문지 Vol.8 No.1
본 논문은 능동 소음 제어를 위한 적응 알고리즘들의 성능을 비교함으로써 효과적인 적응 알고리즘을 보인다. 일반적인 적응 알고리즘으로는 normalized least mean square (NLMS) 알고리즘이 있다. NLMS는 구조가 간단하고 수렴 속도가 빠르다는 장점이 있어서 널리 사용되고 있다. 하지만 상관도가 높은 신호에 대해서는 수렴 성능이 떨어지는 문제가 발생한다. 이에 수렴 성능을 개선하기 위해 affine projection (AP) 알고리즘을 사용하고 있다. 하지만 연산량의 문제로 AP 알고리즘의 사용이 제한적이다. 이러한 사실을 바탕으로 협대역 소음 제어를 위한 능동 소음 제어 시스템에서 NLMS와 AP 알고리즘을 연산량과 수렴 성능을 비교함으로써 효과적인 알고리즘을 도출하였다. 실험을 통해 NLMS와 AP 알고리즘의 소음 제어 성능이 차이가 크게 발생하지 않는 것을 확인함으로써 NLMS가 AP 알고리즘에 비해 소음 제어에 효과적임을 확인하였다. In this paper, we confirm the effective adaptive algorithm for tha active noise contorl (ANC) though the performance comparison between adaptive algorithms. Generally, the normalized least mean square (NLMS) algorithm has been widely used for an adaptive algorithm thanks to its simplicity and having a fast convergence speed. However, the convergence performance of the NLMS algorithms is often deteriorated by colored input signals. To overcome this problem, the affine pojection (AP) algorithm that updates the weight vector based on a number of recent input vectors can be used for allowing a higher convergence speed than the NLMS algorithm, but it is computationally complex. Thus, the proper algorithm were determined by the comparison between NLMS and AP algorithms regarding as the convergence performance and complexity. Simulation results confirmed that the noise reduction performance of NLMS algorithm was comparable to AP algorithm with low complexity. Therefore the NLMS algorithm is more effective for ANC system.
제주화산회토의 자연초지에 대한 질소 , 인산 , 가리시비의 효과
이근상,고서봉,이희석,강태홍,양승주 ( Keun sang Lee,Seo bong Ko,Hee seok Lee,Tae hong Kang,Seung ju Yang . ) 한국축산학회 1976 한국축산학회지 Vol.18 No.6
This experiment was begun in effort to determine proper amount of N.P.K application in native pasture of Jeju area at elevations of 200m. The experimental field which was applied with rates of 1, 2, 3 and 4 times of 10-10-8㎏ per 10a as basic fertilizer was designed with each of 13 treatments. The results of this experiment that continued from April of 1974 till Nov. of 1975 over two years are summarized as follows. (1) Average plant height showed remarkable increase in proportional application of fertilizer. Particularly, in their same level, the effect of nitrogen and potassium raised higher than that of phosphorus. (2) N application had significant influence on dry matter yield. However, the effect of P on D.M yield was less and was not related to the amount of N-K applied, too. (3) Plant height was closely related to D.M yield. (r=0.792) (4) Percentage botanical composition found an approximately linear increase to fertilizer N.P.K in grass, but fall in response to the highest level in the case of legume. Botanical composition of grass ranged from 66 percent in non-fertilizer to about 80percent in fertilizer treatment and legume from 60 to 5 percent. (5) The crude protein content was increased with the increasing rate of N-K, but the crude fiber content showed not any difference. The effect of increasing phosphorus was not founded. (6) Above results were estimated that moderate fertilizer amount of native pasture was 20∼30㎏ in N, 10㎏ in P and 16∼24㎏ in K per 10a.
이근상 ( Geun Sang Lee ),김태근 ( Tae Keun Kim ) 한국지리정보학회 2012 한국지리정보학회지 Vol.15 No.3
본 연구에서는 비점오염원 평가에서 기대평균농도 적용에 필요한 토지피복 클래스를 추출하기 위해 Landsat TM 영상의 근적외선밴드 자료를 이용하여 농경지를 논과 밭으로 분류하였다. 환경부의 대분류와 중분류자료를 이용하여 영상에서 분류한 토지피복도의 정확도를 평가한 결과, 각각 83.96%와 78.41%로 높은 정확도를 확보할 수 있었다. 그리고 영상분류를 통해 추출한 토지피복도를 기초로 하여 유출곡선지수와 직접유출을 평가한 결과 동복댐과 동복천 유역이 높게 분석되었다. 또한 유역별 기대평균농도 분석에서는 BOD, TN, TP 모두 겸백 수위표와 보성강 상류 유역이 높게 나타났으며, 직접유출과의 조합을 통한 비점오염원 분석에서도 겸백 수위표와 보성강 상류 유역이 높게 분석되어 비점오염원 관리를 위한 중점 대상지역으로 선정되었다. The agricultural area was classified into dry and paddy fields in this study using the near-infrared band of Landsat TM to extract land cover classes that need to the application of Expected Mean Concentration (EMC) in nonpoint source works. The accuracy of image classification of the land cover map from Landsat TM image showed 83.61% and 78.41% respectively by comparing with the large and middle scale land cover map of Ministry of Environment. As the result of Soil Conservation Service (SCS) Curve Number (CN) using the land cover map from image classification, Dongbok dam and Dongbok stream basin were analyzed high, Also Geymbaek water-gage and Bosunggang upstream basin showed high in the analysis of EMC of BOD, TN, TP by basin, And also Geymbaek water-gage and Bosunggang upstream basin showed high in the analysis of non-point source through coupling with direct runoff, Therefore these basins were selected with the main area for the management of nonpoint source.