• Economic and Environmental Geology
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• v.50 no.6
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• pp.545-554
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• 2017

Birnessite is one of the dominant Mn (oxyhydr)oxide phases commonly found in soil and deep ocean environments. It typically occurs as nano-sized and poorly crystalline aggregates in the natural environment. It is well known that birnessite participates in a wide variety of bio/geochemical reactions as a reactive mineral phase with structural defects, cation vacancies, and mixed valences of structural Mn. These various bio/geochemical reactions control not only the fate and transport of inorganic and organic substances in the environment, but also the formation of diverse Mn (oxyhydr)oxides through birnessite transformation. This review assessed and discussed about the phase transformation of birnessite under a wide range of environmental conditions and about the potential geochemical factors controlling the corresponding reactions in the literature. Birnessite transformation to other types of Mn (oxyhydr)oxides were affected by dissolved Mn(II), dissolved oxygen, solution pH, and co-existing cation (i.e., $Mg^{2+}$). However, there still have been many issues to be unraveled on the complex bio/geochemical processes involved in the phase transformation of birnessite. Future work on the detail mechanisms of birnessite transformation should be further investigated.

• Korean Journal of Agricultural and Forest Meteorology
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• v.9 no.4
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• pp.234-246
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• 2007

The role of macropore in the hydrological processes is important at the hillslope scale. Developments and distribution of macropores have not been investigated in conjunction with the characteristics of the hillslope such as topography, soil property, and soil moisture. In this study, macropore properties, such as macropore flow and saturation hydraulic conductivity were measured at a hillslope located in Gwangneung Research Forest, Pochun-gun, Gyeonggi-do, South Korea. An intensive field survey provided a refined Digital Elevation Model (DEM) for surface and subsurface topography. Spatial distributions of upslope area and topographic index were obtained through the digital terrain analysis. The total number of monitoring points was 22, and the selected points were distributed along the transect of the digital contour map. Vertical fluxes through macropores were measured using a tension infiltrometer at the depth of 0.1 m from the surface. Spatial and temporal distributions of soil moisture were obtained using an on-line measurement system, TRASE, installed in the study area. Soil moisture for the aforementioned points was measured at 0.1 and 0.3m depths below the surface. The results from tension infiltrometer experiments present that the macropore flows ranged between 21 and 94%, and the measured macroporosities varied from 1.4 to 47%. Macropore flows and macroporosities tended to increase as the measurement location moved to downslope. The ability for water conduction through macropores becomes increasingly developed as the location approaches the outlet of the hillslope.

• Analytical Science and Technology
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• v.23 no.6
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• pp.537-543
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• 2010

Dopamine (DA) is an important neurotransmitter molecule of catecholamines. Its deficiency could lead to brain disorder such as Parkinson's disease and schizophrenia. Therefore, it is necessary to establish a suitable analytical technique with sensitivity and simplicity. A competitive enzyme-linked immunosorbent assay for DA has been optimized and characterized. Assay sensitivity is controlled by two factors in competitive immunoassay. One is a nature and concentration of competitor, and the other is those of binder, antibody. Thus, optimization was performed: BSA-DA conjugate and antibody-avidin conjugate were prepared by dual heterobifunctional coupling method using SATA and SMCC. Assay condition was optimized with $6.66\;{\mu}gmL^{-1}$ of BSA-DA and $4.17{\times}10^{-10}\;M$ of antibody-avidin conjugate. A dose-response curve was constructed, and a limit of detection and a dynamic range for DA were accomplished to $2.3{\times}10^{-2}\;{\mu}g\;mL^{-1}$ and four orders of magnitude ($1.0{\times}10^{-7}\;M$ to $1.0{\times}10^{-3}\;M$), respectively. Calibration curve was constructed on dynamic range and least-squares regression of this data gave the following relationship: absorbance = -0.1098 log[DA]+0.0353 ($R^2$ = 0.9956).

• Korean Journal of Environmental Agriculture
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• v.12 no.3
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• pp.209-218
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• 1993

The behaviour of insectcide ethoprophos (O-ethyl S,S-propyl phosphorodithioate) in soil was investigated. In a laboratory study, the degradation of ethoprophos in soil followed first-order reaction kinetics. The half-life of the insecticide in the soil incubated with 10, 18 and $25^{\circ}C$ was 12.4, 5.5 and 2.5 days, respectively. Arrhenius activation energy was 73.8 KJ/mole. The half-life was 46.4, 17.6 and 6.9 day in the soil with 7, 14 and 19% of soil water content, respectively. The moisture dependence B value in empirical equation was 1.67. The adsorption isotherm for ethoprophos in the soil agreed with freundlich equation. The adsorption distribution coefficient (Kd) was 0.27. In a field study prepared in autumn with undisturbed soil column in a mini-lysimeter system, ethoprophos residues were largely distributed in the top $0{\sim}2cm$ soil layer and moved down to the top 6cm soil layer. Persistence of ethoprophos in field soil was correlated with variation in weather pattern during the period of experiments. The half-life of ethoprophos treated at March and October was about 17 and 5 days, respectively. The ethoprophos woil was degraded up to 90% at 37day after the both treatment. In persistence and mobility of ethoprophos in field soil, the observed data were reasonably corresponded with predicted data by some computer model of pesticide behaviour.

• The Journal of Engineering Geology
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• v.11 no.3
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• pp.303-313
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• 2001

A cut-slope near Guam-Ri Hwado-Eup Namyangju-Si Kyunggi-Do collapsed during a heavy rainfall over 400mm at 28th of August 2000. The cut-slope collapse reportedly developed mainly by block sliding along a set of discontinuities, although slope angle of the cut-slope was 40$^{\circ}$(1:1.2) that agrees with the road construction criteria. This study aims to analyze differences and correlations among several data-collecting methods limited to discontinuity analysis related with cut-slope collapse. This study started with analysing discontinuity surface characteristics, geology of the country rock and orientations of the discontinuities directly related with the collapse. Analysis of aerial photos around the study area provided regional lineament data, and discontinuity plane description and measurements were collected from core logging and Borehole Image Processing System (BIPS). Spearmans correlation ranking coefficient method was used to get correlation of discontinuity planes according to analysis methods. The result suggests that the correlation coefficient is ${\gamma}_s$ = 0.91 Plus, stability analysis of discontinuity plane orientation data using equal-area stereonet revealed that the study area is unstable to planar failure. This study suggests that the cut-slope angles currently applied should be shallower and that significant attention is required to orientation distribution of discontinuities existed in cut-slopes studies.

• Applied Microscopy
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• v.32 no.3
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• pp.265-273
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• 2002

The purpose of this study was to observe the influences of the water fluoride concentration on the growth changes, the histologic characteristics of osteoblast in the tibia of growing newborn rats by using electron microscopy and on the composition changes of bone matrix in those by using energy dispersive x-ray system (EDX). The water fluoride concentration was respectively 0 ppm (contrast group), 100 ppm (100 ppm group), 200 ppm (200 ppm group) and 300 ppm (300 ppm group). The results of the investigation by using electron microscopy were as followed. In contrast group, the traditional cuboidal osteoblasts were observed. In 100 ppm group, several reversal line, the newly formed osteoid by the strongly activated osteoblast and the well developed rough endoplasmic reticulum, mitochondria in cytoplasm of osteoblast were observed. Also, many secretory vesicle around cell membrane were observed and some fused with cell membrane released secretory granule out of cell. In 200 ppm group, the depressed osteoblasts were observed, mitochondria in cytoplasm were expanded and cristae shape in mitochondria were destroyed. Also, the ribosome at the surface of rough endoplasmic reticulum were not observed. In 300 ppm group, the adjacent osteoblasts with endosteum were irregularly arranged, the cell membrane were destroyed and organelles were flowed out of cell. On the other hand, the results of the investigation by using energy dispersive x-ray system were as followed. P and Ca concentrations in 100 ppm group were increased more than those in contrast group. But, in 200 and 300 ppm group were not increased more than those in 100 ppm group. Therefore, the activities of the osteoblasts were increased, the bone matrix were actively synthesized by the supplied water fluoride. But, the osteoblasts were destroyed, inhibited by the higher water fluoride concentration.

• Archives of design research
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• v.11 no.1
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• pp.131-142
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• 1998

Gustav KJimt (l862-1916)was a pioneer in the field of painting and decorative art. He was severly critized by the art critics of the time because of his rebellous art style. He firmly believed that there should exist a new kind of art that should portray the essence of the new liberalized era and that shoud reveal the idea of an artist in his work. Klimt was an aesthetic who sought beauty in life. He represented man as a micro universe within the macro universe. In order to portray man's inner being and to depict the process of life and death in nature, he symbolically employed female entity as a medium. Through uses of the circles, triangles, rectangles, and the spiral forms in his paintings, Klimt symbolized the meanings of man and nature. The circle symbolizes the universe and female entity; the triangle, human being; the rectangle, the earth and male entity; and the spiral, a universal force that attracts the opposite poles. The highly decorative characteristic nature of Klint's paintings and murals has often been modified in the pattern design field. It has been applied to home-furnishings and apparel textile designs, stained glasses, tiles, and posters. The techniques and layouts of these designs have been modified so that they may suit their manufacturing processes. In general, these pattern designs have two spectrums. One is the kind of design that has faithfully carried out Klimt' s original painting style. The other is the kind that has extracted the essence from the Klimt' s original art work.

• Applied Chemistry for Engineering
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• v.25 no.4
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• pp.418-424
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• 2014

The improved thermal stability and anti-oxidation properties of Lyocell fiber were studied based on flame retardant treatment by using NaCl/$H_3PO_4$ solution. The optimized conditions of flame retardant treatment were studied on various maxing ratio of NaCl and $H_3PO_4$ and the mechanism was proposed through experimental results of thermal stability anti-oxidation. The IPDT (integral procedural decomposition temperature), LOI (limited oxygen index) and $E_a$ (activation energy) increased 23, 30 and 24% respectively via flame retardant treatment. It is noted that thermal stability and anti-oxidation improved based on char and carbon layer formation by dehydrogenation and dissociation of C-C bond resulting the hindrance of oxygen and heat energy into polymer resin. The optimized conditions for efficient flame retardant property of Lyocell fiber were provided using NaCl/$H_3PO_4$ solution and the mechanism was also studied based on experimental results such as IDT (initial decomposition temperature), IPDT, LOI and $E_a$.

• Korean Journal of Food Science and Technology
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• v.27 no.1
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• pp.134-140
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• 1995

Four different mashes using traditional methods in Korea such as Andong soju, Moonbaeju, Leekangju and Jindo hongju, were prepared for distilled liquor. The changes of pH, total acid, reducing sugar, total sugar, alcohol, solid content and ${\beta}-amylase$ activities in their mashes were studied during fermentation. Ethanol content of mashes were increased to the range of $8.8{\sim}11.2%$ after 16 days of fermentation. The group which was brewed by the first addition of mash showed higher ethanol content than the other group which was not added the ones. Total acid content of mashes increased to $0.59{\sim}1.10%$. The total sugar content was decreased to $6.70{\sim}8.94%$, and that of Leekangju type was lower than that of other fermented mashes. Reducing sugar content was in the range of $0.62{\sim}6.42%$ at the initial fermentation and decreased to $0.09{\sim}0.30%$ after 16 days of fermentation. Soju was obtained by distillation of each fermented mashes using the modified traditional Togori. After distillation of mashes, pH was increased and total acid was reduced. Sugar(3.58%) and solid(1.17%) in Leekangju were found to be leached from the mixture of pear, ginger, cinnamon, honey and curcuma rhizome.

• Journal of Korea Society of Industrial Information Systems
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• v.16 no.4
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• pp.87-98
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• 2011

Detecting a moving object from videos and tracking it are basic and necessary preprocessing steps in many video systems like object recognition, context aware, and intelligent visual surveillance. In this paper, we propose a method that is able to detect a moving object quickly and accurately in a condition that background and light change in a real time. Furthermore, our system detects strongly an object in a condition that the target object is covered with other objects. For effective detection, effective Eigen-space and FCM are combined and employed, and a CONDENSATION algorithm is used to trace a detected object strongly. First, training data collected from a background image are linear-transformed using Principal Component Analysis (PCA). Second, an Eigen-background is organized from selected principal components having excellent discrimination ability on an object and a background. Next, an object is detected with FCM that uses a convolution result of the Eigen-vector of previous steps and the input image. Finally, an object is tracked by using coordinates of an detected object as an input value of condensation algorithm. Images including various moving objects in a same time are collected and used as training data to realize our system that is able to be adapted to change of light and background in a fixed camera. The result of test shows that the proposed method detects an object strongly in a condition having a change of light and a background, and partial movement of an object.