• Proceedings of the Materials Research Society of Korea Conference
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• 1993.11a
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• pp.34-35
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• 1993

• Korean Journal of Crystallography
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• v.8 no.2
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• pp.144-148
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• 1997

the molecular and crystal 3-dimensional structure of bentazone, C10H12N2O3S, has been determined from single crystal x-ray diffraction study. Crystal system is monoclinic: a=8.7817(9)Å, b=9.6059(9) Å, c=13.574(9) Å, β=97.269(1)', V=1136.1(6)Å, space group : P21/c, z=4. The molecular structure model was solved by direct method and refined by full matrix least squares. The final reliable factor, R, is 0.045 for 1396 independent reflections(Fo2>4σFo2). A molecule has a staggered conformation with thiocarbazin ring and isopropyl functional group and the molecules by hydrogen bonds are cross stacked along the c-axis.

• 대한생식의학회:학술대회논문집
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• 2006.06a
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• pp.176.1-176.1
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• 2006

• Asian-Australasian Journal of Animal Sciences
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• v.18 no.12
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• pp.1786-1793
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• 2005

The study compared the fatty acid profiles of 3 muscles (Longissimus dorsi, LD, Triceps brachii, TB and Semimembranosus, SM) obtained from Korean Hanwoo (18 steers, 24 months old) and Australian Angus beef (18 steers, 24 months old) and assessed their role in sensory perception. The samples of each carcass were prepared in the same manner, and cooked both as traditional grilled steaks and Korean BBQ style. A total of 720 Korean sensory panelists evaluated the beef samples for tenderness, juiciness, flavor, and overall liking. Oleic acid (18:1) was significantly (p<0.05) higher in TB than that in LD and SM. The essential linoleic acid (C18:2) was significantly (p<0.05) higher in TB and SM than that in LD. For LD muscle, the proportion of saturated fatty acids was significantly (p<0.05) highest, while that of polyunsaturated fatty acids was lowest among the three muscles. Australian Angus beef had significantly (p<0.05) higher n-3 PUFA than that of the Korean Hanwoo for the three muscles, while the latter contained significantly (p<0.05) higher n-6 PUFA than that of the former. The clustering analysis showed that there a was significant difference in fatty acids such as C16:0, C16:1n7, C18:0, C18:2n6, C18:3n3, C20:3n6, C20:4n6, C22:4n6, and C22:5n3 for sensory perception (tenderness, juiciness, flavor and overall likeness) of the beef from two origins (p<0.05) among three clusters. Especially, C14:0 had a significant effect on sensory perception only for Korean Hanwoo beef; while C20:5n3 had a significant (p<0.05) effect only for Australian Angus beef based on clustering with the sensory variables.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.26 no.1
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• pp.49-52
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• 2016

The effect of process parameters such as the growth pressure and temperature on the AlN crystal growth has been investigated. AlN crystal was grown onto 6H-SiC seed crystal using PVT (Physical Vapor Transport) method. Crystal properties and morphology of AlN crystal was changed with growth pressure and temperature. Raman analysis confirmed that AlN crystals with different orientation were successfully grown on SiC seed crystal.

• Journal of the Korean Magnetics Society
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• v.5 no.5
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• pp.874-879
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• 1995

Magnetic properties of FeMoN, FeMoTaN, FeTaN and FeTaC films deposited by DC magnetron reactive sputter were investigated, and correlated with their microstructure. FeMoN films were not showen the soft magnetic prop¬erties, because of generated $Fe_{2}Mo$, $Fe_{3-2}N$ and $Fe_{4}N$ phases. Ta added films, however, effectivly retarded the $\alpha$-Fe grain growth and suppressed the generation of Fe nitrides or carbides during heat treatement. The soft magnetic properties of $B_{s}:15\;kG,\;H_{e}:0.25\;Oe,\;\mu':4000(at\;5\;MHz),\;and\;B_s:14.5\;kG,\;He:0.25\;Oe,\;\mu':2700(5MHz)$ were observed in $Fe_{78.8} Ta_{8.5}N_{12.7}\;and\;Fe{75.6}Ta_{8.1}C_{16.3}$ films, respectively.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.186-191
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• 1998

$UO_2$-5wt%CeO$_2$ 분말에서 소결온도(1600, 1$700^{\circ}C$), 소결분위기(H$_2$, $N_2$-7vol.%H$_2$) 및 Li$_2$O 첨가량(0.05-2wt%)에 따른 소결성의 변화를 관찰하였다. $UO_2$-5wt%CeO$_2$를 attrition mill에서 2 시간까지 분쇄한 후, 1$700^{\circ}C$에서 H$_2$, N2-7vol.%H$_2$ 분위기에서 소결하면 소결밀도가 각각 10.46, 10.36 g/㎤이지만, 각 분위기에서 소결체내의 결경립크기가 일정하지 않고 Ce agg1omerate도 소결체내의 여러 곳에 분포되어 있어 분말처리만으로 소결성을 개선하는데는 한계가 있었다. 반면에, $UO_2$-5wt%CeO$_2$에 0.lwt%Li$_2$O를 첨가하여 1 시간동안 분쇄란 후, 1$600^{\circ}C$에서 H$_2$$N_2$-7vol.%H$_2$ 분위기로 소결하면 밀도는 각각 10.51, 10.48 g/㎤이었고, 결정립크기는 각각 8.9, 42.1 $\mu\textrm{m}$이었다. 즉, Li$_2$O의 첨가에 의해 밀도와 결정립크기가 모두 증가했으며, H$_2$ 분위기보다는 $N_2$-7vol.%H$_2$ 분위기에서 결정립이 더 크게 성장하였고, 1$700^{\circ}C$에서도 유사한 경향을 나타내었다. $UO_2$-5wt%CeO$_2$와 이 조성에 0.lwt%Li$_2$O를 첨가한 분말들을 H$_2$ 및 $N_2$-7vol.%H$_2$ 분위기에서 소결하여 기공크기 및 기공부피의 변화를 관찰한 결과, H2 분위기에서 소결하였을 때는 Li$_2$O의 첨가에 의해 치밀화가 주로 일어났고, 반면에 $N_2$-7vol.%H$_2$ 분위기에서 소결하면 Li$_2$O의 첨가에 의해 작은 기공은 소멸되고 큰 기공이 생성되었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.04b
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• pp.45-46
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• 2009

We have fabricated advanced metal-oxide-semiconductor (MOS) capacitors with thin (${\approx}10\;nm$) Inductive-Coupled Plasma (ICP) CVD $Si_xN_y$ dielectric layers and investigated electrical properties of nitrided $SiO_2$/4H-SiC interface after oxidizing the $Si_xN_y$ in dry oxidation and/or $N_2$ annealing. An improvement of electrical properties have been revealed in capacitance-voltage (C-V) and current density-electrical field (J-E) measurements if compared with non-annealed oxidized-SiN. The improvements of SiC MOS capacitors formed by oxidized-SiN have been explained in this paper.

• Bulletin of the Korean Chemical Society
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• v.20 no.12
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• pp.1399-1408
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• 1999

Geometrical structures for the dimerization of (NO)₂ from (NO + NO) have been calculated using ab initio Har-tree-Fock (SCF), second-order Møller-Plesset perturbation (MP2), and coupled cluster with the single, double, and triple substitution [CCSD(T)] methods with a triple zeta plus polarization (TZP) basis set including diffuse Rydberg basis functions. The structure of (NO)₂ can be described by two interactions (N…N, N…O). One is the ONNO structure with an (N…N) interaction. In this structure, acyclic cis-ONNO with $C_{2v}$-symmetry, acyclic trans-ONNO with $C_{2h}$, and cyclic ONNO with trapezoidal structure ($C_{2v}$) are optimized at the MP2 level. The other structure is the ONON structure with an (N…O) interaction. In the structure, acyclic cis-ONON with Cs$^{-symmetry}$ and cyclic ONON of the rectangular ($C_{2h}$), square $(D_{2h})$, rhombic $(D_{2h})$, and parallelogramic $(D_{2h})$ geometries are also optimized. It is found that acyclic cis-ONNO (¹A₁) is the most stable structure and cyclic ONNO (³A₁) is the least stable. Acyclic trans-ONNO (³A₁) with an (N…N) interaction, acyclic trans-ONON and bicyclic ONON $(C_{2v})$ with (N…O) interaction, and acyclic cis- and trans-NOON with an (O…O) interaction can not be optimized at the MP2 level. Particularly, acyclic trans-ONNO with $C_{2h}$-symmetry can not be optimized at the CCSD(T) level. Meanwhile, acyclic NNOO (¹A₁, $C_s)$ and trianglic NNOO (¹A₁,$C_{2v})$ formed by the (O…N) interaction between O₂ and N₂ are optimized at the MP2 level. The binding energies and the relative energy gaps among the isomers are found to be relatively small./sec. Spiral CT scans during the arterial phase were obtained 35 seconds after the injection of contrast medium. CT findings of 78 lesions less than 4cm in diameter were correlated with angiographic findings. Results : The attenuation of lesions was high(n = 69), iso(n = 5), and low(n = 4) compared with liver parenchyma during the arterial phase of spiral CT. In lesions with high-, iso-, and low-attenuation during the arterial phase of spiral CT, hypervascularity on angiograms was found in 63 of 69(91.3%), three of five(60%), and three of four lesions(75%), respectively. Six lesions with high-attenuation on the arterial phase of spiral CT were not seen on angiography. Two iso-attenuated and one low-attenuated lesion were hypovascular on angiograms. Conclusion : The results of this study suggest that with some exceptions there was good correlation between the arterial phase of spiral CT and angiography.

• Korean Journal of Crystallography
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• v.10 no.2
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• pp.125-129
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• 1999

X-선 회절법을 이용하여 1-(3 Carbamoyl-3,3-diphenylpropyl)-1-methylhexahydro-1H-azepinium iodide[이하: DIP]의 분자 및 결정구조를 규명하였다. 이 결정의 분자식은 C23H31N2O·I, 결정계는 Monoclinic이며 공간군은 P21이다. 단위포 상수는 a =8.937(1) Å, b=19.522(2) Å, c=6.485(2) Å이며, β= 105.18(2)°, V=1091.9(6) Å3, T=293(2)K, Z=2, Dc=1.45 Mgm-3이다. 회절반점들의 세기는 Enarf-Nonius CAD-4 diffractometer로 얻었으며 Mo Katjs(λ=0.71073 Å)을 사용하였다. 분자구조는 직접법으로 개략적인 분자모델을 설정하고, Fo>4σ(Fo)인 4112개의 독립 회절 데이터에 대하여 최소자승법으로 정밀화하여 최종 신뢰도 값 R=5.23%인 최종적인 분자모형을 구하였다.