• 한국잠사곤충학회지
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• 제36권2호
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• pp.147-151
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• 1994

고급성과 위생성이 우수한 견과 실용적 특성이 우수한 합성섬유의 서로의 장점만을 가진 이상적인 직물을 개발코저 시험한 결과 고치와 polyester 복합사(S/P 복합사)와 복합 직물의 특성은 다음과 같다. 1. 자동조사기에 의한 복합사 제조시험 결과 빔을 5회 주었을때 보다 빔을 주지 않았을때 사조 집합도가 향상되었으며 빔을 주지 않고 공기교란 장치만으로 섬도 감지기의 작동도 정확히 이루어져 섬도편차가 양호한 S/P 복합사를 제조할 수 있었다. 2. S/P 복합사를 SEM으로 관찰한 결과 포합이 잘된 부분이 많았으나 견사는 견사끼리 polyester는 polyester 끼리 포합된 형태도 관찰되었다. 3. 직물을 SEM으로 관찰한 chiffon 직물은 강연을 한 결과 견사 부분이 polyester사 내부로 파묻힌 곳도 관찰되었다. 4. 분산염료와 산성염료 혼합용액에서 일욕 이단법으로 염색한 S/P 복합사 직물의 염색견뢰도는 habutae 직물은 일광견뢰도가 3급인 것을 제외하고는 모두 4급 이상으로 양호하였고 chiffon 직물은 모두 4급이상으로 양호하였다. 5. habutae 직물과 chiffon 직물의 특성을 보면 강력과 modulus는 생지에서 가장 크고 염색 가공지에서 크게 감소되었으며 신도는 정련지와 염색 가공지가 생지보다 증가되었다.

• Natural Product Sciences
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• 제10권6호
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• pp.315-320
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• 2004

Alpha-viniferin was previously isolated as a cyclooxygenase (COX)-2 inhibitor from Carex humilis (Cyperaceae) and is an oligomeric stilbene compound with benzofuran (BF) moieties in its chemical structure. In the present study, a chemically synthetic BF compound, named as 3,3-dimethyl-2,3,4,6,7,8,9,10,11,12,13,14,15,16,17,18-hexadecahydro-1H-benzo[b] cyclopentadeca[d]furan-1-one, was discovered to inhibit bacterial lipo polysaccharide (LPS)-induced prostaglandin $E_2$ $(PGE_2)$ production in macrophages RAW 264.7. The BF compound exhibited a selectively preferred inhibitory effect on COX-2 activity over COX-1 activity. Furthermore, BF compound inhibited LPS-induced COX-2 expression at transcription level. As a down-regulatory mechanism of COX-2 expression shown by BF compound, suppression of nuclear factor $(NF)-{\kappa}B$ activation has been demonstrated. BF compound inhibited LPS-induced $NF-{\kappa}B$ transcriptional activity and nuclear translocation of $NF-{\kappa}B$ p65, in parallel, but did not affect LPS-induced degradation of inhibitory ${\kappa}B{\alpha}$ protein $(I{\kappa}B{\alpha})$. Taken together, anti-inflammatory effect of BF compound on $PGE_2$ production was ascribed by its down-regulatory action on LPS-induced COX-2 synthesis in addition to inhibitory action on enzyme activity of COX-2.

• 인지과학
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• 제18권4호
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• pp.371-398
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• 2007

이 연구는 의미점화과제와 반복점화과제를 사용하여 사용빈도와 의미투명성이 복합명사의 분리처리 양상에 어떤 영향을 미치는지를 알아보았다. 실험 1에서는 사용빈도에 따라 복합명사의 분리처리 양상이 달라지는지를 검토하였다. 의미점화효과가 복합명사 연상어 조건에서 자극제시시차나 사용빈도와 무관하게 관찰되었으며, 반복점화효과는 부분조건과 전체조건에서 모두 관찰되었지만 부분조건에서 더 큰 반복점화효과를 보였다. 이 결과는 복합명사가 하위 형태소로 분리되어 처리되는 경로와 복합명사 전체로 처리되는 경로가 함께 존재할 가능성을 보여준다. 실험 2에서는 의미투명도에 따라 복합명사의 분리처리 양상이 달라지는지를 검토하였다. 의미점화효과가 복합명사 연상어 조건에서 자극제시시차나 의미투명도에 무관하게 관찰되었으며, 반복점화과제에서도 실험 1b와 유사한 결과를 보였다. 실험 1과 2의 결과는 어휘수준에서 분리처리경로와 전체처리경로를 통해 활성화된 의미가 개념 수준에서 이루어지는 상호작용과정을 통해 복합명사의 의미를 결정함을 시사한다.

• 한국자기학회지
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• 제11권4호
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• pp.157-162
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• 2001

Sm-Co계 플라스틱 자석 제조를 위한 사출 성형용 컴 파운드의 제조법을 연구하기 위해 미세분말과 조대분말을 혼합하여 자성분말의 입도 변화, 배합비 및 부피분율에 따른 컴파운드의 유변학적 특성을 조사하였다. 조대분말의 평균입도가 증가하면 분말의 충진율이 증가하여 컴파운드의 점도가 감소하였다. 그러나 미세분말의 평균입도가 작아지는 경우, 미세분말들간의 응집성으로 인하여 오히려 점도가 증가하였다. 기계적으로 분쇄된 Sm-Co계 분말의 경우, 125~75 $\mu\textrm{m}$ 크기의 조대분말과 평균입도 4.9 $\mu\textrm{m}$인 미세분말을 혼합하여 제조된 컴파운드의 점도는 분말의 배합비에 의존하며 조대분말을 60%혼합한 경우 가장 낮은 점도를 나타냈다. 이는조대분말의 양이 60 %일 때 자성분말의 충진율이 최대가 됨을 의미한다. 자성분말의 부피분율에 따른 컴파운드의 점도는 유변학적 모델을 잘 만족시켰으며 사출 성형이 가능한 Sm-Co계 자성분말의 최대 부피분율은 약 66 %이었다.

• 한국임상수의학회지
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• 제25권5호
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• pp.370-378
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• 2008

The aim of this study was to investigate bioactivities of 50% Chitin - hydroxyapatite (Chitin-H) compound and 50% Chitosan - hydroxyapatite (Chitosan-H) compound in canine bone. Ten healthy mongrel dogs (1-5 years old, 1.7 - 6.9 kg) were used in this study. These compounds had been transplanted into bilateral femur separately, and then the changes of femur were observed through the examinations of hemato-biochemical profiles, radiology, and histological profiles for 42 days. After 3 weeks, expanded radiolucent changes were observed in both areas transplanted the compounds. After 6 weeks, the area transplanted the Chitin-H compound did not observe any changes of bony tissue, while the area inserted the Chitosan-H compound was observed changes of increasing bone formation. In histological examination, infiltrations of inflammatory cells and bone absorptions were observed at both transplanted sites. However an increasing of active osteogenesis was observed at the transplanted site with Chitosan-H compound. In conclusion, Chitosan-H compound had an function of active osteogenesis as compared with Chitin-H compound. From this study, it is indicated that Chitosan-H compound would be used in dogs with severe bone defect.

• Elastomers and Composites
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• 제36권3호
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• pp.162-168
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• 2001

저분자량 폴리부타디엔 (액상 BR)은 실리카로 보강된 스티렌-부타디엔 고무 (SBR) 배합물에서 실리카 분간을 향상시킨다. 본 연구에서는 액상 BR의 분사량이 미치는 영향에 내하여 조사하였다. 레오 그래프에서 측정되는 최소 토크와 최내 토크는 액상 BR의 분자량이 큰 것(HLBR)을 사용했을 때가 액상 BR의 분자량이 작은 것 (LLBR)을 사용했을 때 보다 더 낮지만 델타 토크는 거의 파이가 없다. 무니 스코치 시간은 HLBR을 사용했을 때 더 빨라졌다. 모듈러스는 HLBR을 사용했을 때 더 낮았지만 인장 강도는 더 강하였다. 신율은 HLBR을 사용했을 때 더 길었다. 열노화에 대한 안정성은 LLBR을 사용한 배합물이 HLBR을 사용한 것보다 더 우수하였다.

• 한국식품영양과학회지
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• 제24권5호
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• pp.702-706
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• 1995

A major component(compound A) in the ethylacetate fraction exhibited a strong antimicrobial activity was identified by UV, IR, FABMS and NMR. The compound A showed strong absorbance at 209, 259 and 359nm, indicating a flavonoid ring structure. IR spectrum possessed absorbance of OH at 3400∼3300cm-1, ketone at around 1650cm-1, and aromatic C=C at around 1660cm-1. Molecular weight of the compound A calculated as 478 from the information of m/z 479(M＋H)+ and m/z 477(M-H)+ in the FABMS spectrum. Molecular formula of this compound was found to be C22H22O12 from m/z 479.1220(＋3.1mmu for C22H23O12) of HRFABMS spectrum and from 13C-NMR spectrum. 1H-NMR and 13C-NMR spectra of the compound A revealed aromatic proton and benzene rings. Distortionless enhancement by polarization transfer(DEPT) exhibited that the compound A possessed 10 quaternary carbons and 3 substituted benzene rings including a methoxy group substitution. The compound A was identified as isorhamnetin 3-O-β-glucopyranoside by spectrophotometric methods in conjunction with 1H-1H COSY, 1H-13C COSY and HMBC, which revealed a flavone with OH group at 3, 5, 7, and 4' and methoxy group at 3' positions esterified to glucose.

• 치과방사선
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• 제28권2호
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• pp.491-503
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• 1998

A cystic compound odontoma in the maxillary sinus occurred in a 13-year-old boy. who had missing right upper third molar without having the history of extraction of the wisdom tooth. He complained nasal stuffiness. headache. and pain on the affected face. resembling any sign and symptoms of the maxillary sinus problems. The cystic compound. sized 2 x 1.5 cm in diameter was pedunculated and attached on the posterior wall of the right maxillary sinus and above the antral floor. The location of the compound odontoma in the maxillary sinus was confirmed after panoramic. waters. spiral tomographic. CT examinations and surgical exploration. Its location was on the medial. posterior. superior to the normal position of the maxillary third molar or the maxillary dental arch. The cystic odontoma in the maxillary sinus made the patient have the signs and symptoms of maxillary sinusitis. The cystic compound odontoma might be originated from the dental lamina of the missing upper right third molar. The 'V principle' of the upper jaw growth and the pneumatization process of the maxillary sinus could explain why the compound odontoma had peduncular shape and the location of odontoma was on the medial. superior to the normal position of the maxillary dental arch.

• 대한기계학회논문집A
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• 제33권4호
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• pp.296-309
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• 2009

Thick-walled cylinder with high pressure have had wide application in the armament industry. In the thick-walled cylinder, fatigue crack is generated at inner radius and developed toward the outer radius. To prevent generation of fatigue crack, the autofrettage process had been used. The compressive residual stress induced by the autofrettage process extends loading pressure and fatigue life of the thick-walled cylinder. In this study, the residual stress of single and compound cylinder by the autofrettage process was evaluated. The analytical compressive residual stress of single cylinder was good agreement with experimental result at inner radius. The analysis on the residual stress of compound cylinder was conducted. The compressive residual stress at inner radius was increased with the overstrain level. And fatigue life of the compound cylinder with initial crack was evaluated. The considered initial crack shape was straight and semi-elliptical. The fatigue life was extended with the overstrain level. The fatigue life of the compound cylinder with semi-elliptical crack was longer than straight crack. The suitable way to extend fatigue life of the compound cylinder was proposed.

• Archives of Pharmacal Research
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• 제25권3호
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• pp.258-269
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• 2002

2-Thiouracil-5-sulfonylchloride 1 reacted with a series of aromatic and heterocyclic amines to give 2a-j. The same compound 1 was reacted with a series of sulphonamides giving different sulphonamides of type 3a-e. On the other hand compound 1 was allowed to react with p-aminoacetophenone givining compound 4 which in turn was allowed to react with derivatives of alkyl thiosemicarbazides to give thiosemicarbazones of type 5a-e, also compound 4 was monobrominated to give compound 6 which in turn was reacted thiosemicarbazones of some aldehydes to give the corresponding thiazole derivatives 7a-f. In the same time compound 4 was reacted with a series of aromatic and heterocyclic aldehydes givining chalcones 8a-g (Claisen-Schemidt reaction). Also compound 4 was allowed to react with a series of aromatic and heterocyclic aldehydes, ethyl cyano acetate and/or malononitrile, and ammonium acetate giving pyridine derivatives 9a-d and 10a-e respectively. The biological effects of some of the new synthesized compounds was also investigated.