• Korean Journal of Poultry Science
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• v.34 no.3
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• pp.165-172
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• 2007

We investigated the effects of dietary supplements of probiotics, illite, active carbon and hardwood vinegar on growth performance, feed intake, and pH, shear force, sensory evaluation, meat color and fatty acid composition of meat in broilers. Two hundred broilers were fed diets for five weeks containing 0.2% of probiotics (T1), and 1% of Illite (T2), 1% active carbon (T3), or 1% hardwood vinegar (T4). Body weight gain was higher in T1 and T4 groups fed the starter diet but was the lowest in C and T4 for finishing period (P<0.05). Feed efficiency was not significantly different. In proximate composition, crude fat content of chicken meat were decreased lower in all treatment groups than control, but moisture, crude protein and crude ash were not significantly different. Cooking loss was decreased in T3 and T4 and WHC (water holing capacity) was increased in T3 and T4 groups compared to the other groups. In sensory evaluation, T4 tended to improve the hardness. Redness $(a^*)$ and yellowness $(b^*)$ were no difference between the all treatment groups, lightness $(L^*)$ were higher in T1, T2, T3 and T4 groups than control group (P<0.05). Stearic acid content was lower in T1, T2, T3 and T4 groups, but oleic acid contents were higher in T1, T2, T3 and T4 groups (P<0.05). These results showed that supplementing broiler diets with 1.0% hardwood vinegar may noticeably improve the meat quality of broiler.

• The Journal of the Petrological Society of Korea
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• v.1 no.1
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• pp.71-84
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• 1992

This paper reports the results about the petrography and mineral chemistry of 13 representative dredged basaltic rocks from the western Caroline Ridge (WCR) and Yap Trench-Arc system, and provides the chemical and tectonic informations based on the compositions of clinopyroxene phenocrysts. Compositions of olivine phenocrysts in some analyzed samples are Fo$_{86-80}$. Plagioclase phenocrysts have variable compositions ranging from An$_{90}$ to An$_{55}$. The compositions of clinopyroxene phenocrysts vary according to geological environments; titansalite in atoll and guyot of WCR, diopside-augite in trough and bank of WCR, and endiopside in Yap Trench-Arc system. Application of the discrimination schemes proposed by Leterrier et al. (1982) suggests: (1) the samples from atoll-guyot belong to within plate alkali basalt, implying that western CR could be the continuation of eastern CR formed by hot spot magmatism, (2) the samples from the Yap Trench-Arc system with no present-day magmatism clearly indicate the occurrence of orogenic tholeiites presumably related to early island arc magmatisms in this area, however, (3) the samples from the bank and trough do not provide definitive informations, which might indicate the complexity of their origins.

• The Journal of the Acoustical Society of Korea
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• v.8 no.1
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• pp.13-22
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• 1989

This study made an analysis of the characteristics of vibration & tone color of the piano strings on which a concentrated mass was set to give variety of different variations to the gamut. Theoretical analyses in this study were based on discrete and continuous system, of which the former was transformed into a multi-degree of freedom system by dividing into a number of small parts, while the latter utilized mode summation and Laplace transformation methods. And experiments were carried out with setting concentrated masses on upright piano string.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.785-790
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• 1997

In domestic, it is not a little results to use natural mineral, stone and sludge as a construction materials. Accordingly, it is required to study for higher application from of resources these materials in its economic and environmental aspects. So, the purpose of this study is to develop the excellent construction materials, a as compare with existing floor materials in material capacity and economic aspects, using natural zeolite, stone dust and sludge. In this viewpoint, this paper investigated to the required capacity such as, compressive strength, bending strength and absorption according to experiment.

• Journal of agriculture & life science
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• v.50 no.2
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• pp.33-43
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• 2016

Pinellia tripartita(Blume) Schott is a herbaceous perennial plant belonging to the Araceae and distributed on Asia including of Korea, Japan, and China. P. tripartita is often used for gardening but has not been developed mass-breeding methods. In this study, we compared the tuber growth in different combinations of mixed soils used six compositions. Tubers used to study was cultured in vitro and divided into two groups. Type I was diameter more than 1cm and the group of Type II was diameter below than 1cm. Enlargement of tubers and growth of aerial parts were measuring the plant height, number of fresh leaves and dead leaves, number of bullets, tuber size, and fresh / dry weight. The size/weight and numbers of tubers from the mixed soil B (coir 68.0%, peat moss 14.7%, perlite 3.0%, vermiculite 7.0% and zeolite 7.0%) were the best grown up for eight weeks. In case of Type I, GI (Growth index) of tuber size and weight were 45% and 101%, respectively. The difference of growth was doubled compared to the bad growth treatment as the mixed soil E(Coir 14.3%, peat moss 14.3%, perlite 42.9%, vermiculite 14.3%, and zeolite 14.3%). These results could be used as the basic information for the similar experimental design for the P. ternata.

• The Journal of Engineering Geology
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• v.29 no.4
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• pp.579-598
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• 2019

We investigated geochemical contaminants and Fe, Al behavior in precipitates of acid mine drainage (AMD) from the Donghae abandoned coal mine, Taebaek, Gangwon Province using aqueous chemical analyses, XRD, IR, and ²⁷Al NMR, Our results showed that water chemistry changed with pH and Eh, and saturation indices of chemical species in the AMD. According to saturation calculated by visual MINTEQ, the AMD was saturated with various Fe-, Al-oxyhydroxide minerals. Reddish brown precipitates are composed of schwertmannite, ferrihydrite, and goethite, whereas whitish precipitates are composed mostly of alumimous minerals such as poorly crystallized basaluminite with trace Al₁₃-Tridecamer. It is important to apply active treatment methods rather than simple storage pond and to control the precipitation and solubility of iron species and aluminous species for ensuring remediation and control for the AMD discharged from the Donghae abandoned coal mine.

• Journal of the Korean earth science society
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• v.27 no.5
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• pp.528-538
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• 2006

Main aspect of this study is to clarify the petrochemistry and petrogenesis of intermediated-basic plutons located in the southwestern part of the Korean peninsula. These Intermediated-basic plutons consist of Pre-Cambrian anorthosite-gabbro, Triassic hornblende gabbro (Jirisan area), Jurassic diorite-syente (Jirisan and north area) and Cretaceous gabbro-diorite (south area). The Massif type anorthosite has multi intrusions, where each one intruded by gabbroic rocks, composed of gabbro, norite, troctolite and leucogabbro. In the variation diagram of the major-minor composition, AMF and Pl-Px-Ol diagrams, we suggest that intermediated-basic plutons in the southwestern part of the Korea show a trend consistent to Daly's value and calc-alkaline rock series. Accoding to REE (La/Yb)cw and Eu/Sm, these plutons are enriched with LREE than HREE, and emplaced by the tectonic setting in continent and/or continental margin.

• Economic and Environmental Geology
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• v.53 no.6
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• pp.677-685
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• 2020

The host rock of the Usuki Stone Buddha Statues is dark gray welded tuff involved the Aso-4 pyroclastic flow sediments. This Buddha Statues are processing chlorosis from rainfall flowing above and underground water which were urgently needed for conservation measurement. White precipitates, the main source of salt weathering, on the surface of the Buddha Statues are mainly consisted of thenardite, gypsum and dolomite. Extraction experiment result shows that thenardite was dissolved at the beginning of stirring and then redissolved after 4 hours, and gypsum was detected until stirring for 2 hours, and then dissolved after stirring for 4 hours. As a result of monitoring the microclimate environment for 11 months to determine the recrystallization environment of white precipitates, the phase transition between thenadite and mirabilite appears widely in spring, and is maintained in an aqueous solution due to high temperatures in summer and fall. In winter, mirabilite is shown the widest by decreasing temperature. Therefore we requires details monitoring for blocking water transfer port and solved humidity environment in shelter.

• Journal of the Korean Magnetics Society
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• v.2 no.1
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• pp.61-68
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• 1992

Structural, magnetic and magneto-optical(1.0~3.2eV) properties of rare earth (Ce, Pr, Eu), transition metal(Ni, Co), and Al substituted polycrystalline Ba ferrite films grown by rf sputtering have been investigated. TEM studies revealed that crystal grains in the films were reduced in size from several hundred nm to the order of 1 nm with the decrease of rf power density during sputtering. By substituting Al, square hysteresis loops have successfully been obtained. It has been found that Niions strongly enhances Faraday rotation of the films in the visible range. It has been confirmed that Co ions also strongly enhances Faraday rotation of the films in the near infrared. En- hancement in Faraday rotation by Ce, Pr, and Eu ions has not been observed. The origin of the enhancement in magnetic and magneto-optical properties of the films is discussed.

• Korean Journal of Medicinal Crop Science
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• v.8 no.1
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• pp.29-40
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• 2000

This experiment was conducted to find appropriate media in hydroponic Culture of Angelica keiskei. The mediaused were carbonized rice hull, perlite, vermiculite, mixture(carbonized rice hull (1) : perlite (1) : peatmoss (1)), mixture+peatmoss20%, mixture+peatmoss40%, mixtrue+peatmoss60%, perlite 40%+peatmoss40%+vermiculite20% and open field cultivation. The highest yield of Angeli ca keiskei was shown 4,428ka/10a at vermiculite. The yield of vermiculite was increased about 133 percent compared to that of open field cultivation. The highest germanium contents was shown 0.52ppm at mixture+peatmoss 40%. The contents of germanium increased about 108 percent at mixture+peatmoss40% compared to that of open field cultivation.