• 한국식품위생안전성학회지
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• 제28권1호
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• pp.56-62
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• 2013

연구에서는 PEN 수지 안전관리를 위하여 HPLC-UV 검출기를 이용한 2,6-NDC 및 2,6-NDA 분석법을 확립하였다. 분석법 검증 결과, 2,6-NDC 및 2,6-NDA 모두 $0.002{\mu}g/mL$ 검출한계, $0.005{\mu}g/mL$ 정량한계 및 $0.05{\sim}1{\mu}g/mL$의 농도 범위에서 $r^2$= 0.999 이상의 직선성을 확인할 수 있었다. 또한 회수율도 90~110%임을 확인할 수 있었다.

• 농업과학연구
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• 제37권1호
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• pp.73-80
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• 2010

Functional and nutritional components of 7 cultivars of Chinese cabbage (CC; Brassica rapa subspecies campestris) from China were analyzed to compare the effects of soil pH (6.9 vs. 7.6). The CC grew on the soil of pH6.9 (CC-6.9) contained significantly increased amounts (2.3~4-fold) of pectin, crude protein, vitamin C and vitamin E compared to the control. The contents of ash and minerals (Ca, Fe, Na, Zn, K and Mn) were also significantly increased in CC-6.9. However, CC-6.9 contained 16-75% lower contents of reducing sugars, cellulose and crude fat than CC-7.6. CC-7.6 contained more glucosinolates than CC-6.9; gluconasturtiin (20.68 vs. 0.84 $nmol{\cdot}g^{-1}$ wet wt) and gluconapin (202.55 vs. 0.15 $nmol{\cdot}g^{-1}$ wet wt). In conclusion, CC-6.9 had an improved texture (high pectin and low cellulose) and nutritional value (high in protein, Ca, Fe, Zn, vitamin C, and E), whereas CC-7.6 had better taste (high in reducing sugars) and anticancer functionality (high in glucosinolates).

• Archives of Pharmacal Research
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• 제25권6호
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• pp.837-841
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• 2002

Four new acetylated ginsenosides were isolated from the processed ginseng (SG, sun ginseng). Their structures were determined to be $3{\beta},{\;}12{\beta}-dihydroxydammar-20(22),24-diene-3-O-{\beta}-D-glucopyranosyl(1{\rightarrow}2)-{\beta}-D-6"-O-acetylglucopyranoside;{\;}3{\beta},12{\beta}-dihydroxydammar-20(21),{\;}24-diene-3-O-{\beta}-D-glucopyranosyl(1{\rightarrow}2)-{\beta}-D-6"-O-acetylglucopyranoside;{\;}3{\beta},{\;}6{\alpha},12{\beta}-trihydroxydammar-20(22),24-diene-6-O-{\beta}-D-6'-O-acetylglucopyranoside{\;}and{\;}3{\beta},6{\alpha},12{\beta}-trihydroxydammar-20(21),24-diene-6-O-{\beta}-D-6'-O-acetylglucopyranoside$ based on spectroscopic evidences. The compounds were named ginsenoside $Rs_4,{\;}Rs_5,{\;}RS_6{\;}and{\;}Rs_7$, respectively.pectively.

• Bulletin of the Korean Chemical Society
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• 제29권10호
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• pp.1973-1976
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• 2008

Electronic photodepletion spectrum of dibenzo-18-crown-6 with a potassium ion ($K^+$-DB18C6) was obtained in the gas phase using electrospray ionization and quadrupole ion-trap reflectron time-of-flight mass spectrometry. The spectrum exhibited rather a broad absorption band at 36350 $cm^{-1}$, which was tentatively assigned as the origin of the S1 band. The photodepletion spectrum of $Cs^+$-DB18C6 was also obtained to elaborate the effects of metal cations on electronic and geometric structures of metal cation-DB18C6 complexes. We found that the S1 band of $Cs^+$-DB18C6 was red-shifted by 180 $cm^{-1}$ from that of $K^+$-DB18C6. With the results of quantum theoretical calculations using the density functional theory, we suggested that the red-shift arose mainly from weaker binding of $Cs^+$ to DB18C6 than that of K+, which resulted from a larger size of $Cs^+$ than that of the cavity in DB18C6.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (중)
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• pp.1285-1288
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• 2002

현재의 인터넷은 IPv4 기술을 이용하여 구축되고 운용되고 있다. 이러한 현재의 인터넷을 한 순간에 IPv6로 전환하는 것은 불가능하며, 당분간은 IPv4 망과 IPv6 망이 공존하면서 점차적으로 IPv6 망으로 전환될 것이다. 따라서 성공적인 IPv6로의 전환은 현재 넓게 구축되어 있는 IPv4 호스트, 라우터들과의 공존성을 유지하는 것이다. 이와 같이 IPv4 망과 IPv6 망이 혼재된 환경에서 두 망간의 통신이 자연스럽게 이루어질 수 있도록 하기 위하여 IETF ngtrans WG 을 중심으로 많은 IPv6 전환 메커니즘이 제안되었다. 그러나 이러한 IPv6 전환 메커니즘들은 단순히 동작만을 정의하고 있기 때문에 제안된 메커니즘이 망의 특성에 따라 제대로 동작할 수 있는지에 대한 연구가 필요하다. 본 논문에서는 IETF ngtrans WG에 제안된 IPv6 전환 메커니즘들의 특성과 장 단점, 구현하기 위해서 필요한 요구사항과 적용하기에 적합한 망과 전환 시기 등에 대하여 분석하였다.

• 폴리머
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• 제29권6호
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• pp.565-570
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• 2005

용융 점도 조절에 의한 나일론6(N6)의 melt impregnation공정에서의 용융가공 특성에 대하여 고찰하여 보았다. N6의 용융 점도를 조절하기 위하여 calcium stearate(CaST)를 윤활제로 사용한 결과, 1 wt$\%$의 윤활제의 첨가에 의하여 용융 점도가 감소함을 알 수 있었다. 아울러 폴리카프로락톤(PCL)을 N6에 반응 용융 블렌딩하여 N6의 용융 점도를 낮출 수 있었으며 phenyl phosphite(PP)와 diphenyl phosphite(DPP)를 첨가하여 블렌딩 시 상호에스테르 교환반응을 증가시켜 추가적인 용융 점도 감소를 확인하였다. 이러한 방법들은 N6의 고온 가공의 문제점으로 지적되는 열안정성 저하를 최소화하면서 melt impregnation 공정에서 필수적인 저점도 가공을 가능하게 할 수 있을 것으로 사료된다.

• Applied Biological Chemistry
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• 제49권1호
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• pp.21-24
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• 2006

6종의 인체 암(폐암, 피부암, 결장암, 자궁암, 선암 및 뇌암)과 그의 17가지 세포주들에 대한 리간드 화합물 3,6-bis(2'-pyridyl)pyridazine(1) 과 3,6-bi s(6'-methyl-2'-pyridyl)pyridazine(2) 그리고 그들의 전이금속(Ni(II), Cu(II) 및 Zn(II)) 착 화합물들 $(3{\sim}6)$ 세포독성을 각각 측정하였다. 그 결과, 특히 Cu(II) 착 화합물, bis-[3,6-bis-(6'-methyl-2'-pyridyl)pyridazine-$k^2N^2,N^3$]chlorocopper(II)perchlorate (4)는 뇌암(SNB-19)과 결장암(SW-62) 세포주에 대하여 제1세대 항암제인 Cis-platin보다 높은 세포독성을 나타내었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1759-1761
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• 2004

In this paper, we studied on life-decision of underground cable of live-line state. Data of CV 6.6kV and 22kV cable's life is got data measured insulation resistance by D.C. overlapped current. We confirmed that D.C resistance reduced by time. Aging of cable could be occurred by electrical, thermal, mechanical stress and complex aging confirmed that proceeded by Weibull plot. In the result, life of 6.6kV cable remained 21 years till light caution and 35 years till heavy caution, so aging of 6.6kV XLPE cable was not occurred. Life of 22kV cable remained 10 years till light caution and 22 years till heavy caution. We confirmed that the designed life of 22kV cable is similar to the measured life.

• 대한화학회지
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• 제29권3호
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• pp.311-318
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• 1985

2,6,6-trimethylcyclohex-l-en-1-yllithium (9)과 3-propylthiobutyraldehyde (16)의 반응으로 부터 1-[3-(Propylthio)butyryl]-2,6,6-trimethylcyclohexene (18)을 합성하였다. 이 방법을 이용하여 강력한 향료로 알려진 1-[3-(methylthio)butyryl]-2,6,6-trimethylcyclohexene (1)을 합성할 것이다.

• 대한치과교정학회지
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• 제43권6호
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• pp.294-301
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• 2013

Objective: To determine the interleukin (IL)-6 levels in gingival crevicular fluid (GCF) of patients with severe root resorption after orthodontic treatment and investigate the effects of different static compressive forces (CFs) on IL-6 production by human periodontal ligament (hPDL) cells and the influence of IL-6 on osteoclastic activation from human osteoclastic precursor (hOCP) cells in vitro. Methods: IL-6 levels in GCF samples collected from 20 patients (15 and 5 subjects without and with radiographic evidence of severe root resorption, respectively) who had undergone orthodontic treatment were measured by ELISA. The levels of IL-6 mRNA in hPDL cells and IL-6 protein in conditioned medium after the application of different uniform CFs (0, 1.0, 2.0, or 4.0 $g/cm^2$ for up to 72 h) were measured by real-time PCR and ELISA, respectively. Finally, the influence of IL-6 on mature osteoclasts was investigated by using hOCP cells on dentin slices in a pit-formation assay. Results: Clinically, the IL-6 levels were significantly higher in the resorption group than in the control group. In vitro, IL-6 mRNA expression significantly increased with increasing CF. IL-6 protein secretion also increased in a time- and magnitude-dependent manner. Resorbed areas on dentin slices were significantly greater in the recombinant human IL-6-treated group and group cultured in hPDL cell-conditioned medium with CF application (4.0 $g/cm^2$) than in the group cultured in hPDL cell-conditioned medium without CF application. Conclusions: IL-6 may play an important role in inducing or facilitating orthodontically induced inflammatory root resorption.