• The Journal of Engineering Geology
• /
• v.27 no.4
• /
• pp.489-500
• /
• 2017

It is not rare that pseudotachylite, dark colored rock with glassy texture, is recognizable in deep core samples drilled up to 900 m from the surface. Pseudotachylite with widths varying few to 20 cm is sharply contacted or interlayered with the host rocks composed of Jurassic granite and Precambrian amphibolite gneiss, showing moderately ductile deformation or slight folding. Pseudotachylite occurring at varying depths in the deep drill core are slightly different in texture and thickness. There is evidence of fault gouge at shallower depths, although brittle deformation is pervasive in most drill cores and pseudotachylite is identified at random depth intervals. Under scanning electron microscope (SEM), it is evident that the surface of pseudotachylite is characterized by a smooth, glassy matrix even at micrometer scale and there is little residual fragments in the glass matrix except microcrystals of quartz with embayed shape. Such textural evidence strongly supports the idea that the pseudotachylite was generated through the friction melting related to strong seismic events. Based on X-ray diffraction (XRD) quantitative analysis, it consists of primary minerals such as quartz, feldspars, biotite, amphibole and secondary minerals including clay minerals, calcite and glassy materials. Such mineralogical features of fractured materials including pseudotachylite indicate that the fractured zone might form at low temperatures possibly below $300^{\circ}C$, which implies that the seismic activity related to the formation of pseudotachylite took place at shallow depths, possibly at most 10 km. Identification and characterization of pseudotachylite provide insight into a better understanding of the paleoseismic activity of deep grounds and fundamental information on the stability of candidate disposal sites for high-level radioactive waste.

• Korean Journal of Food Science and Technology
• /
• v.17 no.4
• /
• pp.283-288
• /
• 1985

Fermented big eyed herring. Harengula zunasi, and slimy, Leiognathus nuchalis, were widely used and contributed in diet of people in southern coast of Korea. In this paper, in order to elucidate the taste compounds of fermented big eyed herring and slimy, the nucleotides and their related compounds, free amino acids, TMAO, betaine, total creatinine, and minerals were analyzed. In fermented big eyed herring, lysine, alanine, leucine, isoleucine and valine were dominant holding 88.6% of the total free amino acids while alanine, leucine, isoleucine and lysine in fermented slimy were dominant holding 84.4% of total free amino acids. In the nulceotide and their related compounds, hypoxanthine was the major component in both samples. The contents of betaine, TMA and total creatinine were 99.7mg%, 24.2mg% and 432.8mg% in fermented big eyed herring, 107.6mg%, 19.5mg% and 258.8mg% in fermented slimy, while the contents of TMAO appeared trace in both samples. In the minerals of both samples Na and Ca were dominant holding 37,471-45,100.8ppm, 14,117.1-19,948.1ppm, respectively. From the omission test and chemical analysis, it is concluded that the major taste compounds of fermented big eyed herring and slimy were amino acids such as alanine, lysine, leucine and isoleucine. Minerals, nucleotides and their related compounds, betaine and total creatinine acted as an auxiliary role in taste of both fermented samples.

• Korean Journal of Food Science and Technology
• /
• v.29 no.5
• /
• pp.869-875
• /
• 1997

The chemical components of Korean pollens and pollen extracts were analysed to provide fundamental data for pollen processing and products development. The contents of crude protein, crude lipid, crude ash, crude fiber and carbohydrate of pollens were $14.0{\sim}22.3%,\;3.0{\sim}8.8%,\;2.2{\sim}3.3%,\;0{\sim}37.5%,\;and\;31.9{\sim}64.4%$ respectively, showing the specially high crude fiber content (37.5%) in Pine pollen. Almost all the carbohydrate, lipid, protein and ash components except fiber were extracted by water and n-hexane. Free sugars identified in water extracts $(10\;^{\circ}Bx)$ of pollens were fructose and glucose as major component and maltose as minor component. The proportions of three free sugars to total soluble solid content of Mixed, Acorn, and Pine water extracts were 73.6%, 85.4% and 47.7% respectively. Potassium and phosphorus content in pollens and pollen water extracts were high, but Ca, Na, Mg, Fe and Zn were not major mineral components. The essential amino acids such as leucine, phenylalanine, methionine, lysine, valine, isoleucine and threonine were contained richly in pollens and those were almost completely extracted by water. Vitamin $B_1$ and C were not detected, but only small amount of vitamin $B_2$ was detected in the pollens and pollen extracts tested. The essential fatty acids such as linoleic acid and linolenic acid were contained richly in pollens. The proportion of unsaturated fatty acids to total fatty acid content in Mixed, Acorn and Darae pollen except Pine was higher than 50%.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.16 no.2
• /
• pp.140-146
• /
• 1983

Considering fermented sardine with $20\%$ salt as a reference, the fermented sardines were prepared with 8 or $10\%$ salt, $0.5\%$ lactic acid, $6\%$ sorbitol and $6\%$ ethanol. The taste compounds and TBA value as the index of lipid oxidation were analysed prior to fermentation and after 60 days fermentation in products. The major free amino acids in fermented sardine determined after 60 days fomentation were lysine, leucine, histidine, glutamic acid, arginine and alanine which occupied about $58\%$ of the total free amino acids while histidine and taurine occupied about $93.3\%$ of them in raw meat. Betaine and TMA increased while TMAO and total creatinine decreased filling the fermentation of 60 days. Addition of $0.02\%$ BHA was effective to retard rancidity of the product. The result of omission test showed that the major taste compounds of the fermented sardine with low salt contents were amino acid such as lysine, alanine, glycine, glutamic acid, leucine and nucleotides and their related compounds, and it is also suggested that betaine, total creatinine and TMAO acted as an auxiliary role.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.9 no.5
• /
• pp.527-533
• /
• 1999

Hertzian indentation tests with spherical indenters in water were conducted to examine the contact fatigue in three dental ceramics, such as feldspathic porcelain, micaceous glass-ceramic (MGC) and glass-infiltrated alumina, which was used as dental restorations, and evaluated the effect of contact damage on strength. Initial damage was dependent of microstructure, showing cone cracks of brittle behavior in the feldspathic porcelain and deformation of quasi-plastic behavior in the MGC, with an intermediate case in the glass-infiltrated alumina. However, as increasing the number of cyclic loading (n=1~n =$10^6$)all materials showed an abrupt strength degradation, at which fracture was originated from damage in the contact fatigue. There were two strength degradation with increasing the number of cyclic loading in specific loads (200N, 500N, 1000N):first was from the cone cracks, and second was from the radial cracks created by cyclic loading. The radial cracks, once formed, led to rapid degradation in strength properties, Finally the material was failed at the high number of cyclic loading. Strength degradation with indentation load at fixed number of cyclic loading indicated that the feldspathic porcelain should be highly damage tolerant to the contact fatigue.

• Korean Journal of Food Science and Technology
• /
• v.47 no.2
• /
• pp.198-203
• /
• 2015

This study was performed to evaluate changes in the chemical composition of germinated rough rice with high hydrostatic pressure treatment (HPT). Rough rice was germinated at $37^{\circ}C$ over 6 days (control), and then subjected to HPT at 30 MPa for 24 h. The highest crude protein content was 9.54% in the control sample after 6 days of germination. Crude lipid content increased from 2.04-2.74% (control) to 2.27-3.10% (HPT). HPT samples showed higher values of total free sugar and glucose content than those of the control. The total amino acid value was not significant, but the essential amino acid content increased from 0.45-5.09 mg/g in the control to 1.57-5.30 mg/g in the HPT sample. The major fatty acids were found to be palmitic, oleic, and linoleic acid. The content of oleic acid decreases with HPT, whereas that of linoleic and linolenic acid increased slightly during the initial stages of germination. These results suggest that HPT after germination efficiently depolymerizes chemical components and enhances the content of essential nutrients.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.8 no.3
• /
• pp.448-453
• /
• 1998

An inverted, stagnation point flow OMVPE reactor was studied by laser Raman spectroscopy. Pure rotational Raman scattering by the carrier gas $(N_2; or; H_2)$ was used to determine the axial centerline temperature profile in the reactor as a function of the inlet flow velocity and the rector aspect ratio. A larger temperature gradient normal to the susceptor surface was obtained with higher gas glow velocity, larger aspect ratio, and the use of a $N_2$ carrier gas.

• Proceedings of the Culinary Society of Korean Academy Conference
• /
• 2004.04a
• /
• pp.51-65
• /
• 2004

1. 일반 성분에서 실크 프로테인은 쌀가루에 비해 단백질은 91.22%로 매우 높은 함량을 보였다. 2. pH는 쌀가루와 실크 프로테인이 비슷한 약산성을 나타냈다. 3. 총 유리당 함량을 보면 쌀가루에 비해 실크 프로테인이 매우 낮음을 알 수 있었다. 4. 총 아미노산 함량에서는 실크 프로테인이 쌀가루보다 13배나 높은 함량을 나타내었다. 5. 쌀가루의 아미노산 조성은 glutamic acid 함량이 가장 높았으며, 실크 프로테인은 glycine이 가장 높았다. 6. 특히 실크프로테인은 곡류의 제한 아미노산인 lysine이 높게 함유되어 있어 곡류 가공 조리제품에 이의 첨가는 부족된 lysine 함량의 보풍에도 큰 효과가 있을 것으로 사료된다. 7. 실크 프로테인 첨가수준에 따른 절편의 관능적 품질변화에서 색택(color)은 무첨가군 및 1% 첨가군를 가장 선호하는 것으로 나타났으며, 종합적 기호도(overall acceptance)는 무첨가구 및 1~3% 첨가구를 선호하는 것으로 나타났다.

• The Korean Journal of Nuclear Medicine
• /
• v.9 no.2
• /
• pp.47-54
• /
• 1975

난포자극호르몬(HFSH)을 클로라민 티를 사용하여 방사성요오드로 표지하였으며 평균 표지수율은 대략 65%이었다. 표지호르몬을 방사면역측정용으로 사용하기 위하여 전분젤 전기영동과 젤여과법으로 분리정제하고 그 분리정제효과를 분석한 결과 젤 여과법이 분리시간, 간편성, 항체와의 결합력 등으로 보아 우수함을 알 수 있었다. 한편 유리표지호르몬과 항체와 결합한 표지호르몬의 비율를 결정하기 위하여 이중항체법을 크로마토전기영동법과 비교하여 본 결과 이중항체법에 의해서만 효과적 비율결정이 가능하였다.

• Korean Journal of Materials Research
• /
• v.5 no.4
• /
• pp.451-457
• /
• 1995

열 필라멘트 화학증착(CVD) 다이아몬드 제조에서 bias인가에 따른 다이아몬드 생성양상의 변화를 조사하였다. 기존의 bias실험에서는 기판과 필라멘트 사이에 bias를 인가시켰으나, 본 연구에서는 이 방법 외에 필라멘트 상 하에 텅스텐 망을 설치하여 bias를 인가시켰다. 실험결과 bias 전압을 인가하는 방법에 관계없이 필라멘트의 전자방출을 촉진시키는 방향으로 bias가 인가될 겨우 다이아몬드의 생성밀도 및 증착속도에 유리하게 작용하였다. 본 결과로부터 다이아몬드 증착시 필라멘트에서 방출되는 전자가 중요한 영향을 미치고 있음을 확인하였다. 전자의 기판표면과의 충돌에 의하여 다이아몬드의 생성에 미치는 효과는 적어도 본 실험에서는 중요하지 않음을 알 수 있었다.