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김도희,유한홍,정종성,조현서,신현출 木浦海洋大學校 2002 論文集 Vol.10 No.1
The main goals of the study were to investigate the sediment quality and trace metal distribution in sediment of Kwangyang Bay, south coastal of Korea. Surface sediment sampling were performed in November, 2000 and February and March, 2001. The concentration of H₂S, IL and COD in sediment were measured by a manual of the Department of Marine Environment of Korea. The extracted trace metals Fe, Cu, Cd, Pb, and Zn in sediments mean analyzed by the flame atomic absorption spectrophotometer with an instrument of model Shimadzu AA-6701F. H₂S, IL and COD in the surface sediment were 1.3 mg/g, 5.9 % and 15.0 mg/g, respectively. The mean content of Fe, Cu, Cd, Pb and Zn were 1523 mg/kg, 4.799 mg/kg, 1.321 mg/kg 9.285 mg/kg and 9.353 mg/kg, respectively. All of these measured trace metals level were over the other reported trace metal level in sediment of coastal area. According to histograms, the content of H₂S, IL and COD and trace metals in sediment of this study were affected by artificial activities rather than natural process.
Neural Decoding of Finger Movements Using Skellam-Based Maximum-Likelihood Decoding
Shin, Hyun-Chool,Aggarwal, Vikram,Acharya, Soumyadipta,Schieber, Marc H.,Thakor $^$, Nitish V. IEEE 2010 IEEE Transactions on Biomedical Engineering Vol.57 No.3
<P>We present an optimal method for decoding the activity of primary motor cortex (M1) neurons in a nonhuman primate during single finger movements. The method is based on the maximum-likelihood (ML) inference, which assuming the probability of finger movements is uniform, is equivalent to the maximum <I>a posteriori</I> (MAP) inference. Each neuron's activation is first quantified by the change in firing rate before and after finger movement. We then estimate the probability density function of this activation given finger movement, i.e., Pr(neuronal activation (x)| finger movements (m)). Based on the ML criterion, we choose finger movements to maximize Pr(x|m). Experimentally, data were collected from 115 task-related neurons in M1 as the monkey performed flexion and extension of each finger and the wrist (12 movements). With as few as 20-25 randomly selected neurons, the proposed method decoded single-finger movements with 99% accuracy. Since the training and decoding procedures in the proposed method are simple and computationally efficient, the method can be extended for real-time neuroprosthetic control of a dexterous hand.</P>
남해안 여자만(여호항)에서의 저서다모류군집의 시ㆍ공간적 변화
신현출(Hyun Chool Shin),김용현(Yong Hyun Kim) 전남대학교 수산과학연구소 2001 수산과학연구소논문집 Vol.10 No.-
This study was carried out to investigate the temporal variation of the benthic polychaetous community in Yoho Harbor in Yoja Bay, from August 1999 to May 2000. Polychaetes, the most dominant faunal group comprising 49.8% of the total number of benthic macrofauna, collected as a total of 52 species with a mean density of 296 ind./㎡. With the passage of time, the density increased toward the inner bay, and the species number increased toward the outer bay. The most abundant polychaete was Heteromastus filiformis(18.2%), Sigambra tentaculata(13.5%), Eteone longa(11.8%) and so on. Comparing with the past studies investigated near the study area, the importance of Prionospio sp.(22.2%), Sternaspio scutata(22.2%) and Notomastus sp.(22.2%) were the dominant species, but in present study, the densities of these dominant species were low. The dominance of H. filiformis, as potential organic pollution indicator species in this study area, mean the progress of organic pollution of Yoho Harbor.
Convergence Acceleration of the LMS Algorithm Using Successive Data Orthogonalization
신현출(Hyun-Chool Shin) 대한전자공학회 2008 電子工學會論文誌-SP (Signal processing) Vol.45 No.2
적응 필터의 입력 신호의 상관도 (correlation)가 클 경우 LMS 알고리즘의 수렴 속도는 상당히 느려지게 된다. 본 논문에서는 입력 신호의 상관도가 높은 상황에서 수렴 속도를 향상시킬 수 있는 적응 필터링 알고리즘을 제안한다. 입력 신호에 대하여 직교성을 가지도록 변환을 인위적으로 가하여 LMS 알고리즘의 한계를 극복한다. 제안한 알고리즘의 성능 향상은 시스템식별 모델을 통하여 그 수렴 속도의 개선을 확인하며 또한 시변 환경 하에서 적응 필터의 시변 추적 능력을 통해 보여 진다. It is well-known that the convergence rate gets worse when an input signal to an adaptive filter is correlated. In this paper we propose a new adaptive filtering algorithm that makes the convergence rate much improved even for highly correlated input signals. By introducing an orthogonal constraint between successive input signal vectors we overcome the slow convergence problem of the LMS algorithm with the correlated input signal. Simulation results show that the proposed algorithm yields fast convergence speed and excellent tracking capability under both time-invariant and time-varying environments, while keeping both computation and implementation simple.
남해안 도장항(평일도)에서의 저서다모류군집의 시ㆍ공간적 변화
신현출(Hyun Chool Shin),김용현(Yong Hyun Kim) 전남대학교 수산과학연구소 2001 수산과학연구소논문집 Vol.10 No.-
This study was carried to investigate the temporal variation of the benthic polychaetous community in Dojang Harbor of Pyeongil 1s., from August, 1999 to May, 2000. Polychaetes, the most dominant faunal group comprising 83.7% of the total number of benthic macrofauna, collected as a total of 62 species with a mean density of 2,448 ind./㎡. With the passage of time, the density increased toward the inner bay, and the species number increased toward the outer bay. The most abundant polychaete was Lumbrineris longifolia(58.2%), and followed by Tharyx sp.(10.8%), Praxillella affinis(6.2%), Terebellides horikoshii(3.6%) and so on. Comparing with the past studies investigated near Dojang Harbor, Glycera chirori, Ampharete arctica and Poecilochaetus johnsoni was importnat species. In the present study in the Dojang Harbor, L. longifolia and Tharyx sp. showed very high densities. The dominance of L. longifolia and Tharyx sp. as potential organic pollution indicator species in this study area mean the organic pollution of Dojang Harbor, due to the dicsharge of domestic sewage and waste ship oil.
신현출(Hyun Chool SHIN),김용현(Yong Hyun KIM) 전남대학교 수산과학연구소 2000 수산과학연구소논문집 Vol.9 No.-
This study was carried out to investigate the temporal variation of the benthic polychaetous community in Yeondo Harbor of Sorido, from August, 1999 to May, 2000. Polychaetes, the most dominant faunal group comprising 85.1% of the total number of benthic macrofauna, collected as a total of 70 species with a mean density of 2,262 ind./m² With the passage of time, the density increased toward the inner bay, and the species number increased toward the outer bay. The most abundant polychaete was Prionospio sp.(16.7%), and followed by Lumbrineris longifolia(16.7%), Chone teres(9.3%),Aricidea sp.(8.9%), Tharys sp.(8.6%) and so on. Comparing with the past studies investigated near Yeondo Harbous, the importance of Magelona japonica, the most dominant species in 1996-1997, decreased with time, but Heteromastus filiformis and Sternaspis scutata appeared as the dominant species in 1998. In the present study, the density of H. filiformis increased, but S. scutata decreased greatly. Prionospio sp., L. Longifolia. C. teres, and Tharyx sp., showing a little densities in past study, occurred as dominant species in present study. The dominance of Prionospio sp., L. longifolia, C. teres, and Tharyx sp. As potential organic pollution indicator species in this study area mean the organic pollution of Yeondo Harbor, due to discharge of waste ship-oil and domestic sewage. And also the benthic ecosystem of Sorido was thought to be varied in the process of long-term succession by the past oil-spill pollution of Sea Prince.
신현출(Hyun Chool SHIN),임경훈(Kyeong Hun LIM) 전남대학교 수산과학연구소 2003 수산과학연구소논문집 Vol.12 No.-
The present study was performed to obtain ecological information about the tidal flats in Tando Bay on the west coast of Korea. Macrobenthic communities were studied at 16 stations and 2 transects on the Tando tidal flats, during June 2003. 14 sampling stations with an 100 m (GY line) or 200 m (SH line) interval were chosen in each tidal flat transect. Duplicate macrobenthos samples were collected using a can corer (10×25 ㎝) at each station during the study period. Total number of species in Tando tidal flats were 88 species, with a mean density of 6282 ind./㎡. There were 43 species of polychaetes (48.9%), 22 species of molluscs (25%), 19 species of crustaceans (21.6%), in Tando tidal flat. Molluscs were represented as a dominant faunal group in Tando tidal flat with a mean density of 4991 ind./㎡, comprising 79.5% of the total benthic animals. This result is because of Molluscs, Musculus senhausia appeared almost quite plentifully from all station. Major dominant species in the Tando tidal flat were Molluscs Musculus senhausia, Laternula anatina, Crustaceans Amphipoda spp., Ilyoplax dentimerosa, Polychaetes Lagis bocki, Cirriformia tentaculata, Heteromastus filiformis, Glycera chirori, Lumbrineris longifolia whose mean densities were 4783, 66, 215, 111, 146, 91, 100, 78, 64 ind./㎡, respectively. Cluster analysis based on the faunal composition showed that Tando tidal flat could be divided into two station groups.