• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.243-244
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• 2003

계면활성제는 모터오일, 제약, 비누, 세제 등의 용도가 다양한 화학 제품 중 하나이다. 계면활성제는 비극성의 긴 탄화수소 체인으로 이루어진 꼬리(tail)부분과 보통은 이온으로 이루어진 극성을 띄는 머리(head)부분으로 구성되어있다. 보통 계면활성제를 나타낼 때는 fig. 1의 성냥개비와 같은 모형으로 표시하는 경우가 많다. 머리부분이 친수기를 나타내고, 꼬리부분이 친유기를 나타낸다. (1-2) 물과 같은 극성용매에서, 친수성과 친유성의 두 가지의 특징을 동시에 가지고 있는 계면활성제는 미셀(micelle)이라고 알려진 정리된 분자 화합이 일어난다.[3] (중략)

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.14 no.8
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• pp.611-617
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• 2001

The non-polar optical phonon scattering in the valence band depends on the masses, ratios, and types of mixtures of constituent atoms. Therefore, the random distribution of atoms in alloy semiconductors should be considered in the analysis of scattering mechanisms. For this purpose, the force equations of n atoms in a unit cell are expressed in a n x n matrix form to obtain the angular frequencies due to the acoustic and non-polar optical phonons. And, n is then assumed to be infinity. When this work is compared with other results published elsewhere, it is concluded that the independence of atomic displacement or amplitude of oscillation as ell as the infinite number of atoms in a unit cell must be taken into account for the random distribution of atoms in alloy semiconductors.

• Journal of the Korean Chemical Society
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• v.40 no.5
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• pp.302-307
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• 1996

Diethanolamine dithiocarbamate is known to react with dichlorobis(ethylenediamine)cohalt(Ⅲ) chloride to form [Co(dtc)3](dtc=diethanolamine dithiocarbamate) in which two sulfur atoms of the dithiocarbamate are bound to cobalt. The complex is moderately soluble in acetone, but sparingly soluble in carbon disulfide. Kinetics and mechanisms of the reaction of dichlorobis(ethylenediamine)cobalt(Ⅲ) chloride with diethanolamine dithiocarbamate have been studied in aqueous solution. Activation parameters have been calculated from the kinetic data for the reaction and from these results a possible mechanism for the reaction has been proposed.

• Journal of the Korean Chemical Society
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• v.28 no.5
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• pp.323-327
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• 1984

Nicotine was reacted with an equimolar amount of ozone in methylene chloride and distilled water. The reaction mixture was separated by column chromatography or thin layer chromatography and then purified by vacuum distillation. The six compounds obtained from this reaction were characterized by NMR, IR and Mass spectrometry. These were identified as unchanged nicotine, nornicotine, anabasine, ${\beta}$-nicotyrine, cotinine and nicotine-N-oxide. From these results, reaction mechanism for the ozonolysis ofon nicotine was proposed; the pyrrolidine ring is attacked by ozone at the 1'-position followed by further transformation.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.19 no.1
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• pp.31-56
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• 1993

The characteristic aroma of Gardenia Absolute Oil made from Gardenia Jasminoides Ellis was investigated by GC and GC-MSD and by sensory evaluation The method of GC Analysis was used Double Column System by Carbowax 20M /SPB-1 of Pola/nonPola columns. And the result data of analysis was checked automatic Relent ion Indexs Match System by GC Workstation. A total of 51 compounds were identified in Gardenia Absolute Oil, including t entatively erstimated 9 compounds. The major components were Linalool, Farnesene of various form, Jasmin Lactone, Gamma undecalactone and Cis-3-hexone derivatives.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.24 no.10
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• pp.784-789
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• 2011

A linear spring model, where the interactions among atoms are assumed to be isotropic and elastic, is employed for the study of non-polar optical phonon scattering in the valence band of alloy semiconductors. The force equations of n atoms are used in the spring model for the consideration of the random distribution of constituent atoms in an alloy semiconductor. When the number of atoms in a unit cell is assumed to be two based on the experimental result, the optical deformation potent is valid for compound semiconductors as well as alloy semiconductors.

• Proceedings of the Korea Contents Association Conference
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• 2019.05a
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• pp.141-142
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• 2019

옛 전남도청과 전남도경찰국이 1980년 5.18 당시 모습으로 복원될 예정이다. 옛 전남도경찰국을 원형복원하여 민주주의의 산 역사 현장으로 전시와 교육, 소통의 공간으로 활용하여야 할 것이다. 옛 전남도경찰국의 원형복원은 5.18 당시 시민군이 옛 전남도 경찰국에서 했던 일과 흔적을 정리해 원형복원해야 할 것이다. 5.18 당시 안병하 도경국장은 근무지 이탈 없이 최선을 다하여 수습을 위해 노력했고, 상부의 강경진압을 거부하고 시민의 안전을 강조하는 소신을 유지해 초기에 광주시내 무기를 소산시켜 탈취방지 뿐만 아니라 경찰무장으로 인한 더 큰 비극을 막았다. 옛 전남도경찰국의 복원공간은 5.18정신을 기리는 시민교육장으로 또 안병하 도경국장의 민주경찰정신과 위민정신을 기리는 공간으로 활용되길 기대한다.

• Proceedings of the Korea Contents Association Conference
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• 2019.05a
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• pp.159-160
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• 2019

2차 세계대전 당시 독일에 의한 유대인 학살은 인류 역사상 가장 참혹한 만행으로 알려져 있다. 이같은 비극적 과거를 되풀이 하지 않기 위해 세계 곳곳에 이와 관련된 박물관들이 건립되어 희생자를 추모하고, 잊지 않게 하고 있다. 대표적인 곳이 유대인의 본거지인 이스라엘의 예루살렘, 독일의 심장부인 베를린, 그리고 세계 정치의 중심인 미국 워싱턴 DC에 있는 홀로코스트 뮤지엄들이다. 이 발표에서는 각각의 박물관들의 입지가 갖는 메시지와 전시콘텐츠들이 갖는 특성들을 분석해 보고자 한다. 이를 통해 과거사에 대한 기억과 반성이라는 역사교육에 있어서 중요한 사안 해결방안의 일단을 찾아보고자 한다.을 통해 평화와 화해를 이루고자 하는 세계인들의 노력에 대해 이해를 하고자 한다.

• Korean Journal of Food Science and Technology
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• v.17 no.1
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• pp.15-21
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• 1985

This study was designed to elucidate the lipid and its fatty acid composition in various tissues of cat fish, Parasilurus asotus. The free lipid contents in meat, skin and viscera were 5.62%, 26.34% and 19.27%, whereas the bound lipid contents in those tissues were 2.34%, 2.30% and 19.27%, respectively. The neutral lipid contents in free lipid were 5 times higher than those in bound lipid, while the phospholipid contents in bound lipid were 4 times higher than those in free lipid. The neutral lipid was mainly composed of triglyceride (79.84%-99.86%) in free lipid, and esterified sterol & hydrocarbon (55.12-64.33%) in bound lipid. The phospholipid was mainly composed of phosphatidyl choline (52.38-69.98%) and phosphatidyl ethanolamine (24.09-40.48%) in free lipid, and phosphatidyl choline (53.03-58.54%) and phosphatidyl ethamolamine (13.80-19.23%) in bound lipid. The major fatty acids of polar lipid in free and bound lipids were C16:0 (28.37%, 21.99%), C18:1 (12.01%, 11.52%), C18:2 (17.93%, 14.12%) and C22:6 (17.22%, 20.63%), and those of nonpolar lipid in free and bound lipids were C16:0 (14.81%, 18.94%), C18: 1 (25.93%, 10.89%) and C22:6 (9.95%,23.44%), respectively. The total essential fatty acid (TEFA) content in skin was slightly higher than that in meat. In both polar and nonpolar lipids in meat ${\omega}3-HUFA$ contents of polar lipid were 1.5-2.0 times higher than nonpolar lipid and also ${\omega}3-HUFA$ content of bound lipid was slightly higher than that of free lipid. There were significant differences in the lipid classification and its fatty acid composition between free and bound lipids and/or in various tissues.

• Korean Journal of Food Science and Technology
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• v.16 no.1
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• pp.99-107
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• 1984

Naked barley flour(Baekdong cultivar) was examined with respect to its pasting properties by means of Brabender amylograph after adding barley lipids, fatty acids, vegetable oils and emulsifiers at 1% level. Amylogram of barley flour showed a similar gelatinization temperature but higher paste viscosities at all reference points as compared with wheat flour. Barley flour showed lower amylograph curves by defatting with n-hexane, namely reductions in initial gelatinization point, maximum viscosity and setback value. But re-addition of n-hexane extract to the defatted flour essentially reproduced the curve obtained in the undefatted flour. Addition of polar and nonpolar lipids exhibited different effects on the pasting properties of barley flour. Polar lipids generally increased maximum viscosity a little while non-polar lipids increased the maximum viscosity substantially. Addition of increasing amounts of nonpolar lipids was found to progressively increase the maximum viscosity. Addition of fatty acids increaed th maximum viscosity and delayed the peak time. The maximum viscosity of defatted barley flour impregnated with unsaturated fatty acids was higher than that of defatted barley flour impregnated with saturated fatty acids Increasing amounts of linoleic acid were fount to progressively increase the maximum viscosity and to delay the peak time of defatted barley flour. Addition of six vegetable oils lowered the gelatinization temperature and rasied the maximum viscosity and temperature at maximum viscosity. Addition of increasing amount of peanut oil was found to decrease the maximum viscosity. The effect of emulsifiers was greater in undefatted flour than in defatted flour. The maximum viscosity of defatted flour was slightly affected by Methocel 50, Methocel 1500 and Emulthin, and substantially increased by Methocel 4000, sodium polyacrylate and calcium stearyl lactylate.