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630 nm Light Emitting Diode 조사가 인체섬유모세포의Caveolin-1과 전구콜라겐 I/III의 발현에 미친 영향
최다인 ( Da In Choi ),최지영 ( Jee Young Choi ),김상엽 ( Sang Yub Kim ),윤숙정 ( Suk Jung Yun ),이지범 ( Jee Bum Lee ),이승철 ( Seung Chul Lee ) 대한피부과학회 2014 대한피부과학회지 Vol.52 No.3
Background: Recent studies indicate that light-emitting diodes (LED) may represent a novel and effective anti-aginglight source for the skin. Among many candidate molecules known to control collagens, caveolin-1 (Cav-1) is knownto play an inhibitory role in cutaneous collagen metabolism. Objective: This study aimed to evaluate the effects of LED irradiation on the expression levels of Cav-1 andprocollagens (proCOLs) in human dermal fibroblasts (HDFs). Methods: Cultured HDFs were irradiated with 630 nm LED at different doses, and the mRNA and proteinexpression levels of Cav-1 and proCOLs I/III were analyzed. Results: In LED-irradiated HDFs, mRNA and protein levels of Cav-1 were found to be down-regulated, whereasthose of proCOLs I/III were up-regulated in a dose-dependent manner. A negative correlation between Cav-1 andproCOLs was verified in Cav-1 siRNA transfected HDFs. LED was moreover found to result in up-regulation oftransforming growth factor (TGF)-β1 and its receptors (TβRI, TβRII), SMAD1, and SMAD2 mRNA levels,indicating that LED may activate the TGF-1/TβR/SMAD pathway in HDFs. Conclusion: The anti-aging effects of 630 nm LED on human skin are likely mediated by up-regulation of proCOLsI/III and inhibition of Cav-1 expression levels in HDFs.
연구논문 : 오이풀 추출물의 비듬균에 대한 항진균 효과 및 RAW 264.7 세포에서의 항염증 효과
유민정 ( Min Jeong Ryu ),임요섭 ( Yo Sup Rim ),최다인 ( Da In Choi ),이숙영 ( Sook Young Lee ) 한국미용학회 2011 한국미용학회지 Vol.17 No.2
In this study, we analyzed the anti-fungal activity against Malassezia furfur, anti-oxidative activity and anti-inflammatory activity of Sanguisorba officinalis extracts. The ethanol extract of S. officinalis was sequentially fractionated with hexane, ethyl acetate, butanol and water. The cell viability was measured by MTT assay. Nitric oxide (NO) production was measured by Griess reagent assay. Anti-fungal activity was examined by paper disc method. The total phenolic contents and flavonoid contents were determined in all the samples, in the following order: ethanol > ethyl acetate > butanol > water > n-hexane. The ethyl acetate fraction showed high inhibition activity to DPPH scavenging radical activity at 500 μg/mL (96%) and more strongly inhibited NO productions compared with other fractions. Also, the ethyl acetate fraction showed the highest anti-fungal activity. According to the results above, it was summarized that the ethyl acetate fraction of S. officinalis have anti-oxidative, anti-fungal and anti-inflammatory activity in M. furfur or macrophage. It would be proposed that ethyl acetate fraction of S. officinalis can become a new cosmetic materials.
가교결합형 poly(POEM-co-AMPSLi-co-GMA) 전해질의 합성과 물리화학적 특성
최다인,류상욱,Choi, Da-In,Ryu, Sang-Woog 한국전기화학회 2014 한국전기화학회지 Vol.17 No.1
In this study, crosslinked poly(POEM-co-AMPSLi-co-GMA)s were prepared by epoxy coupling of GMA after radical copolymerization of AMPS, POEM and GMA followed by acid-base titration reaction between sulfonic acid of AMPS and $Li_2CO_3$. It was observed that the crystalline melting temperature of POEM was effected by mol% of components and shifted to lower value by lithiation of AMPS group. The ionic conductivity of crosslinked polymer electrolyte was decreased by addition of GMA but maintained over $1.0{\times}10^{-6}S\;cm^{-1}$ until 16 mol%. Particularly, the self-doped polymer electrolyte with 2 mol% of GMA showed its ionic conductivity as high as $4.08{\times}10^{-6}S\;cm^{-1}$ at room temperature and electrochemical stability up to 6 V. In addition, 0.11 MPa of modulus and 270% of elongation were obtained from the free standing film of crosslinked polymer electrolyte. 본 실험에서는 다양한 조성의 AMPS, POEM 및 GMA를 함유하는 공중합체를 합성하고, AMPS의 술폰산기와 $Li_2CO_3$와의 산염기 반응 및 에폭시기의 가교반응을 유도하여 가교결합된 poly(POEM-co-AMPSLi-co-GMA) 전해질을 제조하였다. POEM의 결정융점은 AMPS 및 POEM의 몰분율에 따라 변화되는 특징을 관찰할 수 있었으며, 리튬이온이 도입된 이후 대체적으로 감소되는 경향이 나타났다. 가교된 고분자의 이온전도도는 GMA의 함량이 증가할수록 다소 감소되는 결과가 나타났지만, 16 mol%까지는 $1.0{\times}10^{-6}S\;cm^{-1}$ 이상의 값을 보여주었다. 특히, 자기-도핑형 전해질임에도 불구하고 2 mol%에서 최대 $4.08{\times}10^{-6}S\;cm^{-1}$의 높은 상온이온전도도가 얻어졌으며, 상온에서 6 V까지 우수한 전기화학적 안정성을 보여주었다. 또한 가교된 고분자전해질은 필름성형이 가능하며, 0.11 MPa의 탄성계수 및 270%의 변형율을 보여주었다.
최다예,이정혜,안정현,서연림,우경인,김윤덕,Da Ye Choi,MD,Jung Hye Lee,MD,Jung Hyun Ahn,MD,Yeon Lim Suh,MD,PhD,Kyung In Woo,MD,PhD,Yoon Duck Kim,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.8
Purpose: Normal squamous cells do not exist in the orbit. Therefore squamous cell carcinoma of the orbit is rare and usually arises as a secondary tumor from distant metastasis or local invasion. The authors herein describe the first case of primary squamous cell carcinoma of the orbit in Korea. Case summary: A 74-year-old female presented with a 2-month history of left upper eyelid swelling and ocular pain. On physical examination, a round, firm, fixed and tender mass was palpable in the superomedial side of the left orbit. Magnetic resonance imaging (MRI) showed 21 mm x 15 mm x 20 mm-sized irregular soft tissue mass with indistinct margin and peripheral enhancement in the superomedial portion of the left orbit, and incisional biopsy of the mass was performed. Histopathological examination showed clusters of squamous cells with polymorphic nuclei and interspersed keratin pearls, consistent with findings of well-differentiated squamous cell carcinoma. Despite extensive systemic work-up, there was no sign of extraorbital malignancy. The patient received left exenteration and adjuvant radiation therapy. Ten months after enucleation, a 12 mm x 14 mm sized firm mass developed on the left forehead, and excisional biopsy and frontalis rotational flap reconstruction were performed. Histopathological examination of the mass was consistent with well-differentiated squamous cell carcinoma. The patient remained alive 17 months after diagnosis without evidence of local recurrence or distant metastasis. Conclusions: Primary squamous cell carcinoma should be considered in the differential diagnosis of acutely progressing tumors of the orbit. J Korean Ophthalmol Soc 2014;55(8):1224-1228
단일이온 Poly(POEM-co-AMPSLi) 전해질에 대한 BF<SUB>3</SUB> 첨가효과
최다인(Da-In Choi),류상욱(Sang-Woog Ryu) 한국고분자학회 2015 폴리머 Vol.39 No.4
본 연구에서는 다양한 조성의 poly(ethylene glycol) methyl ether methacryate(POEM)과 2-acrylamido-2-methyl-1-propanesulfonic acid(AMPS)를 함유하는 공중합체를 합성하고 Li2CO3와의 적정반응을 통해 단일이온 전도성 poly(POEM-co-AMPSLi)를 제조하여 전기화학적 특성을 평가하였다. 또한 고분자전해질에 BF3를 첨가하여 루이스산이 이온전도도 및 열적특성에 미치는 영향을 평가하였다. 제조된 고분자전해질은 0.93의 리튬이온 수송률이 관찰되어 단일이온 전도체임을 확인하고 6 V까지 전기화학적 안정성을 보여주었지만, 3.2×10<SUP>-7</SUP> S/cm의 낮은 상온 이온 전도도가 관찰되었다. 하지만, 고분자전해질에 대한 BF3첨가는 이온간 해리를 가능하게 하여 상온 이온전도도의 경우 [EO]:[Li] 비율 27:1에서 최대 1.3×10<SUP>-5</SUP> S/cm의 높은 값을 얻을 수 있었다. 나아가 BF3 첨가는 리튬이온과 ethylene oxide기의 배위를 증가시켜 결과적으로 고분자전해질의 결정용융온도를 감소시키는 효과도 함께 나타내었다. Single-ion conducting poly(POEM-co-AMPSLi)s were prepared by a radical polymerization of various amount of poly(ethylene glycol) methyl ether methacryate (POEM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) followed by a titration with Li2CO3. The electrochemical properties and an effect of BF3inclusion on the ionic conductivity and thermal properties were investigated. The obtained polymer electrolytes showed electrochemical stability up-to 6 V and 0.93 of lithium ion transference number suggested that the electrolytes are one of the single-ion conductors but only 3.2×10<SUP>-7</SUP> S/cm of room temperature ionic conductivity was observed. However, there was a dramatic increase of room temperature ionic conductivity after inclusion of BF3 and 1.3×10<SUP>-5</SUP> S/cm was observed in polymer electrolyte with [EO]:[Li] ratio of 27:1. Furthermore, the inclusion of BF3 decreases the crystalline melting temperature of polymer electrolytes by increasing the coordination between lithium ion and ethylene oxide unit in the polymer matrix.
치과교정여부에 따른 치과협조도에 영향을 미치는 요인 연구
이경희,박한빛,용희연,이지희,최다인,현혜민,정은서,Lee, Kyeong-Hee,Park, Han-Bit,Yong, Hee-Yeon,Lee, Ji-Hee,Choi, Da-In,Hyeon, Hye-Min,Jung, Eun-Seo 한국치위생학회 2017 한국치위생학회지 Vol.17 No.4
Objectives: This study aims to investigate patient cooperation for dental treatments by dividing patients into two groups with different treatment categories, i.e. orthodontic patients versus non-orthodontic patients. Methods: On December 2016, the study conducted survey targeting 311 orthodontic or non-orthodontic patients who are 20 years old or older living in Seoul and Gyeonggi-do, South Korea. The study subject were informed with the adequate information of the study and signed consent forms. Except for the questionnaire copies from 23 respondents whose answers were insincere those from 288 respondents, equivalent to 92.6% of the data collected, were used in the present analysis. Results: This review intended to clarify any factors affecting patient cooperation for dental treatments shows that the perception of oral condition, the reliability of dentistry, and the patient preventive cooperation had an effect on patient cooperation for dental treatments. Conclusions: The results summarized above suggest orthodontic patients who are familiar with dental treatments by virtue of their regular visits to dental clinics have higher cooperation for dental treatments compared to non-orthodontic patients, and the higher reliability of dentistry leads to higher patient cooperation for dental treatments.
손동혁(Dong-Hyeok Son),최다운(Da-Woon Choi),김명수(Myung-Su Kim),강인준(In-Jun Kang),김병국(Byung-Kuk Kim),조윤현(Yun-Hyun Cho) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 연구는 영구자석 AC 동기전동기의 초기 기동제어에 대하여 연구하였다. 회전자 위치 검출용 센서는 홀센서를 사용하였고 전동기 운전을 벡터제어를 사용하기 위해 전동기가 정지된 상태에서 홀센서 신호에 따른 회전자 위치를 계산하였다. 견인전동기가 주행저항 보다 큰 견인력을 내기 위해 전동기를 BLDC로 기동한 후 안정적 운전을 위해서 벡터제어로 전환하였다.