• 한국조리학회지
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• 제13권3호
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• pp.12-19
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• 2007

본 연구의 목적은 한국의 전통음식 중의 하나인 비빔밥의 재료들의 색채 범위를 분석하여 메뉴북에 인쇄되어지는 재료별 색채범위를 제시하고자 하였다. 본 연구의 목적을 달성하기 위하여 다음과 같은 과정을 통해 진행하였다. 먼저 한국의 전통음식에 근거한 비빔밥 사진과 레시피를 확정하였으며, 요리 전문 사진가를 통해 메뉴북에 가장 보기 좋게 인쇄되어질 수 있는 촬영 기준을 선정하였고, 위의 환경에서 비빔밥 사진을 촬영하였다. 세부적으로 3회 정도의 사진 촬영을 한 후 가장 좋은 상태의 사진을 선정하여 이 때 각 재료들의 색채 값을 측정하였다. 색채 범위 측정을 위해서 Lab 값과 CMYK 값을 적용하였는데, Lab 값은 밝기, 붉은색, 황색을 측정하는 값으로 육안으로 표현되어지는 색이며, CMYK 값은 메뉴 북에 인쇄되어지는 색의 값을 의미한다. 본 연구의 결과, 육안으로 보여지는 색깔과 메뉴북에 인쇄되어지는 값이 다르게 보여진다는 결과를 보였다. 최적 상태 각 재료별 인쇄 값은 다음과 같다. 청포묵은 C23 M5 Y8 K0였고, 호박은 C75 M24 Y100 K9였으며, 고사리 C64 M55 Y76 K55였다. 콩나물은 C38 M24 Y55 K1였고, 당근은 C12 M75 Y87 K2였으며, 표고버섯은 C45 M37 Y78 K11였다, 시금치는 C82 M44 Y100 K48였으며, 도라지는 C25 M5 Y24 K0였고, 계란은 C26 M19 Y100 K0였으며, 마지막으로 쇠고기는 C66 M5 Y72 K0였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.290-293
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• 2003

Ohmic contact characteristics of Al ion implanted n-type SiC wafer were investigated. Al ions implanted with high dose to obtain the final concentration of $5{\times}10^{19}/cm^3$, then annealed at high temperature. Firstly, B ion ion implanted p-well region were formed which is needed for fabrication of SiC devices such as DIMOSFET and un diode. Secondly, Al implanted high dose region for ohmic contact were formed. After ion implantation, the samples were annealed at high temperature up to $1600^{\circ}C\;and\;1700^{\circ}C$ for 30 min in order to activate the implanted ions electrically. Both the inear TLM and circular TLM method were used for characterization. Ni/Ti metal layer was used for contact metal which is widely used in fabrication of ohmic contacts for n-type SiC. The metal layer was deposited by using RF sputtering and rapid thermal annealed at $950^{\circ}C$ for 90sec. Good ohmic contact characteristics could be obtained regardless of measuring methods. The measured specific contact resistivity for the samples annealed at $1600^{\circ}C\;and\;1700^{\circ}C$ were $1.8{\times}10^{-3}{\Omega}cm^2$, $5.6{\times}10^{-5}{\Omega}cm^2$, respectively. Using the same metal and same process of the ohmic contacts in n-type SiC, it is found possible to make a good ohmic contacts to p-type SiC. It is very helpful for fabricating a integrated SiC devices. In addition, we obtained that the ratio of the electrically activated ions to the implanted Al ions were 10% and 60% for the samples annealed at $1600^{\circ}C\;and\;1700^{\circ}C$, respectively.

• 센서학회지
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• 제17권6호
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• pp.425-428
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• 2008

This paper describes the resonant characteristics of polycrystalline SiC micro resonators. The $1{\mu}m$ thick polycrystalline 3C-SiC cantilevers with different lengths were fabricated using a surface micromachining technique. Polycrystalline 3C-SiC micro resonators were actuated by piezoelectric element and their fundamental resonance was measured by a laser vibrometer in vacuum at room temperature. For the $100{\sim}40{\mu}m$ long cantilevers, the fundamental frequency appeared at $147.2kHz{\sim}856.3kHz$. The $100{\mu}m$ and $80{\mu}m$ long cantilevers have second mode resonant frequency at 857.5.kHz and 1.14.MHz, respectively. Therefore, polycrystalline 3C-SiC resonators are suitable for RF MEMS devices and bio/chemical sensor applications.

• Carbon letters
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• 제5권4호
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• pp.164-169
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• 2004

Carbon-ceramic composites refer to a special class of carbon based materials which cover the main drawbacks of carbon, particularly its proneness to air oxidation, while essentially retaining its outstanding properties. In the present paper, the authors report the results of a systematic study made towards the development of C-SiC-$B_4C$ composites, which involves the effects of compositional parameters, namely, carbon-to-ceramic and ceramic-to-ceramic ratios, on the oxidation behaviour as well as other characteristics of these composites. The C-SiC-$B_4C$ composites, heat-treated to $1400^{\circ}C$, have shown that their oxidation behaviour at temperatures of 800~$1200^{\circ}C$ depends jointly on the total ceramic content and the SiC : $B_4C$ ratio. Good compositions of C-SiC-$B_4C$ composites exhibiting zero weight loss in air at temperatures of 800~$1200^{\circ}C$ for periods of 4~9 h, have been identified. Composites with these compositions undergo a weight gain or a maximum weight loss of less than 3% during the establishment of a protective layer at the surface of carbon in a period of 1~6 h. Significant improvement in the strength of C-SiC-$B_4C$ composites has been observed which increases with an increase in the total ceramic content and also with an increase in the SiC : $B_4C$ ratio.

• 대한화학회지
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• 제36권4호
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• pp.536-539
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• 1992

8원자-고리를 가지고 있는 Spiro Orthocarbonate(C$_{25}H_{20}O_4$)의 분자 및 결정구조를 X-선법으로 연구하였다. 이 결정은 단사정계이고 공간군은 C2/c이다. 단위세포 길이는 a = 15.319(4), b = 9.057(3), c = 13.168(3)${\AA}$이며, ${\beta}$값은 98.53(3)$^{\circ}$이고 Z = 4이다. 회절 반점들의 세기는 흑연 단색화 장치가 있는 자동 4축회절기로 얻었으며 Mo-K${\alpha}$ X-선(${\lambda}$ = 0.7107 ${\AA}$)을 사용하였다. 분자구조는 직접법으로 풀었으며 최소자승법으로 정밀화 하였고, 최종 신뢰도 R값은 1412개의 회전반점에 대하여 0.052였다. 분자는 C$_2$ 점군에 속하는 대칭성을 갖고 있다. 8원자-고리의 형태는 pseudo-C$_s$ symmetry를 갖는 의자형이다. 두 개의 나프탈렌 고리들은 서로 거의 직각을 이루며 고리내의 C-C 결합길이는 1.352∼1.444${\AA}$범위에 있고 내부결합 각도는 117.2∼123.1$^{\circ}$범위에 있다. 8원자-고리의 영향으로 C(1)-C(9), C(8)-C(9) 그리고 C(9)-C(10)이 다른 C-C 결합길이 보다 약간 길다.

• 한국식품과학회지
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• 제19권6호
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• pp.533-536
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• 1987

강남콩 지방질중 triglyceride를 TLC로 분리한 후 HPLC에 의하여 PN별로 분획하였다. 각 PN별 triglyceride 분획은 다시 GLC에 의하여 acyl 탄소수별 조성을 분석하고 PN별 획분의 지방산 조성도 분석하였다. 이들 결과를 종합하여 triglyceride의 조성을 추정한 결과, 강남콩의 triglyceride는 총 14종이었으며 C18:2 C18:3 C18:3, C18:2 C18:2 C18:3, C18:3 C18:3 C18:3이 주성분으로 각각 전체 triglyceride의 26.6%, 18.5%, 14.9%이었다.

• 한국결정성장학회지
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• 제29권6호
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• pp.338-344
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• 2019

B₄C-SiC 복합체를 소결 첨가제 없이 일축가압소결법을 통해 제조하였으며 소결체의 결정상, 상대밀도, 미세구조 및 기계적 특성을 평가하였다. 제조된 B₄C-SiC 복합체에서 B₄C와 SiC는 균일하게 분산되어 결정립 성장을 억제하고 세밀하고 균일한 미세구조를 형성하였으며 이를 통해 B₄C-SiC 복합체의 기계적 특성을 향상시킬 수 있었다. 소결온도 2,000℃, 40 MPa 압력 조건에서 소결된 B₄C-SiC 복합체의 상대밀도는 99.8 % 이상이었으며, B₄C 50 wt% 조성 복합체의 꺾임 강도와 비커스 경도는 각각 약 625 MPa과 30 GPa로 측정되었다.

• Bulletin of the Korean Chemical Society
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• 제32권5호
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• pp.1559-1563
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• 2011

Thermal hydrogenation of phenylacetylene (PA, $C_8H_6$) to styrene ($C_8H_8$) on pre-$C_xH_y$- and C-covered Cu(111) single crystal substrates has been studied using temperature-programmed desorption (TPD) mass spectrometry. Chemisorbed PA with an acetylene group has been proved to be associated with hydrogen of pre-adsorbed $C_xH_y$ to form styrene (104 amu) on Cu surface. For the parent (PA) mass (102 amu) TPD profile, the TPD peaks at 360 K and 410 K are assigned to chemisorbed vertically aligned PA and flat-lying cross-bridged PA, respectively (J. Phys. Chem. C 2007, 111, 5101). The relative $I_{360K}/I_{410K}$ TPD ratio dramatically increases with increasing pre-adsorbed $C_xH_y$ before dosing PA, while the ratio does not increase for pre-C-covered surface. For PA on pre-$C_xH_y$-covered Cu(111) surface, styrene desorption is enhanced relative to the parent PA desorption, while styrene formation is dramatically quenched on pre-C-covered (lack of adsorbed hydrogen nearby) surface. It appears that only cross-bridged PA associates with adsorbed hydrogen to form styrene that promptly desorbs at 410 K, while vertically aligned PA is less likely to participate in forming styrene.

• Asian-Australasian Journal of Animal Sciences
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• 제7권4호
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• pp.505-507
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• 1994

A total of 526 domestic and experimental animals in Miyagi prefecture, Japan were investigated for fecal carriage of Campylobacter jejuni and Campylobacter coli. C. jejuni was detected in chickens (8.2%), dogs (6.3%), pigs (4.3%), cattle (1.8%) and hamsters (1.4%). C. coli was only detected from pigs (20.7%). Drug susceptibility test was performed on 5 strains of C. jejuni isolated from chickens and 13 strains of C. coli isolated from pigs to tylosin (TS), thianphenicol (TP), carbadox (CDX), chroltetracyclin (CTC), vancomycin (VCM), cefoperazone (CPZ), latamoxef (LMOX), GM were highly effective and CTC, CP and PL were moderately effective against both C. jejuni and C. coli. TS and TPH were moderately effective against C. jejuni; however, they were less effective to C. coli. One strain of C. jejuni against CTC considered to be drug resistant. The results suggest that C. jejuni and C. coli can be controlled by several drugs effectively, although a drug resistant strain exists.

• 한국세라믹학회지
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• 제46권5호
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• pp.488-492
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• 2009

Porous frit-bonded SiC ceramics were successfully prepared at a temperature as low as $800^{\circ}C$ from SiC, frit, and microbeads (glass or polymer). The effects of SiC starting particle size and microbead addition on microstructure, porosity, and flexural strength were investigated. The addition of hollow glass microbead improved the strength of frit-bonded SiC ceramics without the loss of porosity by acting additional binder phase between SiC grains. The 65 ${\mu}m$-sized SiC resulted in lower porosity and higher strength than 50 ${\mu}m$-sized SiC because of higher packing density. Typical flexural strengths of frit-bonded SiC were 23 MPa at 46% porosity and 19 MPa at 49% porosity.