• Korean Journal of Fisheries and Aquatic Sciences
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• v.29 no.6
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• pp.779-786
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• 1996

The main purpose of this study was to estimate the role of dissolved inorganic nitrogen (DIN) released from sediment and denitrification process in sediment on the nitrogen budget of Hiroshima Bay by means of collecting data on distributions and budgets of nitrogen and phosphorus in the bay, DIN fluxes across sediment-water interface and denitrification rates in the sediments of the same area. The TN : TP and DIN:DIP atomic ratios of the discharged freshwater were about 26 and 21, respectively. The standing stocks in the seawater of the TN : TP atomic ratio varied from 8 to 14 with an annual mean value of 11, while the DIN : DIP atomic ratio varied from 10 to 15 with an annual mean value of 12 in the bay. The residence time of nitrogen and phosphorus were estimated to be about 109 days and 200 days in the bay, respectively. The proportion of DIN released from sediment and denitrification rate to the loading of total nitrogen into Hiroshima Bay were $45\%\;(37\~82\%)\;and\;13\%(0.0\~37\%)$, respectively, and the amount of nitrogen through denitrification process was 6.5 times larger than the outflow of nitrogen from the bay. The results show that DIN released from sediment and denitrification process in sediment play important roles on the nitrogen budget in Hiroshima Bay.

• Analytical Science and Technology
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• v.15 no.4
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• pp.321-328
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• 2002

From May 1999 to July 2000, concentration of 17 metals (Al, Ba, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Pb, Sr, V, Zn), 4 ions (${NH_4}^+$, $Cl^-$, ${NO_3}^-$, ${SO_4}^{2-}$) and pH in rainwater were investigated. The volume-weighted mean concentrations (VWM) of ${NO_3}^-$ and ${SO_4}^{2-}$ were 16.0 and $17.0{\mu}mol\;L^{-1}$. The average pH was 4.53, which ranged from 3.83 to 6.06. The characteristic variations of these species were investigated in terms of the source of these species by principal component analysis (PCA) and interelement correlation coefficients. The elements were classified into three categories: anthropogenic source (Cd, Cu, Fe, Ni, Pb, V, Zn, ${NH_4}^+$, ${NO_3}^-$, ${SO_4}^{2-}$ and $H^+$), soil and crust dust (Al, Ba, Ca, Fe, Mn) and sea salts (Mg, Na, $Cl^-$). In addition, we compared the concentrations in rainwater, which were taken on the same day in three sites (Higashi-Hiroshima, an urban-facing area and a mountain-facing area of Mt. Gokurakuji) in order to examine the regional effect against the concentrations in them. At the urban-facing area of Mt. Gokurakuji, the concentrations of chemical compositions were higher than other areas.

• JSTS:Journal of Semiconductor Technology and Science
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• v.16 no.4
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• pp.405-414
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• 2016

IC-implementations provide high performance for solving the high computational cost of pattern matching but have relative low flexibility for satisfying different applications. In this paper, we report an associative memory architecture for k nearest neighbor (KNN) search, which is one of the most basic algorithms in pattern matching. The designed architecture features reconfigurable vector-component parallelism enabled by programmable switching circuits between vector components, and a dedicated majority vote circuit. In addition, the main time-consuming part of KNN is solved by a clock mapping concept based weighted frequency dividers that drastically reduce the in principle exponential increase of the worst-case search-clock number with the bit width of vector components to only a linear increase. A test chip in 180 nm CMOS technology, which has 32 rows, 8 parallel 8-bit vector-components in each row, consumes altogether in peak 61.4 mW and only 11.9 mW for nearest squared Euclidean distance search (at 45.58 MHz and 1.8 V).

• 제어로봇시스템학회:학술대회논문집
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• 1995.10a
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• pp.99-102
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• 1995

In this paper, we consider the stabilization problem of nonstandard singularly perturbed systems by using state feedback. Different fro the existing sequenetial designn procedures, we propose a parallel design method to construct the stabilizing controller. The method involves solving two completely independent algebraic Riccati equations.

• Proceedings of the Korean Society of Medical Physics Conference
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• 1999.11a
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• pp.342-344
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• 1999

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.383-384
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• 2001

The tonguefish, Cynoglossus robustus and C. abbreviatus (Order Pleuronectiformes, Family Cynoglossidae), inhabits on soft and sand mud bottoms at depth of 20∼85 m around Korea, China and Japan(Nakabo, 1993; Okamura et al., 1970). The tonguefishes are economically important species and are relatively abundant among the fishes found in the Seto Inland Sea(Inaba, 1963: Inaba, 1988). (omitted)

• Proceedings of the IEEK Conference
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• 2000.07a
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• pp.171-174
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• 2000

This paper proposes a pipelined adaptive filter based on affine projection algorithm with order 2. This filter gives a better convergence performance than that of LMS or NLMS pipeline algorithm and has same latency with the pipeline algorithm based on equivalent transformation. Compared to the critical path of the pipeline NLMS implementation, only 2 additions are increased in that of the proposed implementation.

• Proceedings of the IEEK Conference
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• 2000.07a
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• pp.215-218
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• 2000

In this paper, a new algorithm for adaptive IIR filters based on equation error methods using the RLS algorithm is proposed. In the proposed algorithm, the concept of feedback of the scaled output error proposed by tin and Unbehauen is employed and the forgetting factor is varied in adaptation process for avoiding the accumulation of the estimation error for additive noise . The proposed algorithm has the good convergence property without the parameter estimation error under the existence of mea-surement noise.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.670-673
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• 2002

This paper proposes a digital algorithm for gray-scale/color image segmentation of real-time video signals and a cell-network-based implementation architecture in state-of-the-art CMOS technology. Through extrapolation of design and simulation results we predict that about 300$\times$300 pixels can be integrated on a chip at 100nm CMOS technology, realizing very high-speed segmentation at about 1600sec per color image. Consequently real-time color-video segmentation will become possible in near future.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.234-234
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• 2006

Novel molecular glassy POSS-based material having carbazole moiety as a photo- and electroactive group was synthesized, and its thermal, morphological, electrochemical, and optical properties were investigated. POSS having carbazole (POSS-Cz) was found to form easily amorphous glassy film by cooling the melt sample or by spin coasting onto glass substrate. POSS-Cz showed monomeric emission even in solid film, which suggests that carbazole moiety can be isolated even in solid state.