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미래 Wi-Fi 및 Bluetooth 환경의 주파수 간섭 영향하에서의 ZigBee의 동작 정도 예상 실험
우병철(ByungCheol Woo),장진엽(Jin-Yeop Chang),은성배(Seongbae Eun),이동민(Dong-Min Lee),신성열(Steve Shin),오세찬(Se-Chan Oh),김준철(Jun-Cheol Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
ZigBee의 2.4 ㎓ 주파수 대역은 다른 많은 무선통신 프로토콜의 주파수 대역과의 중첩은, 상호 주파수 간섭에 의한 통신 불능이나 통신 오류로 인한 지연 등, ZigBee 통신의 실제 적용 가능성에 많은 우려를 제기 하고 있다. 특히 현재 널리 쓰이는 Wi-Fi와 최근에 보편화되기 시작한 Bluetooth 장치들과의 간섭은, 현재뿐만 아니라 Zigbee가 널리 사용될 것으로 예상되는 향후 1, 2년 후의 사용 환경까지를 가정하여 실험하는 것이 중요하다고 판단하여, 그 결과를 본고에서 소개한다.
A cell-repellent sulfonated PEG comb-like polymer for highly resolved cell micropatterns
Jung, Jaeyeon,Na, Kyunga,Shin, Byungcheol,Kim, Okgene,Lee, Jonghwan,Yun, Kyusik,Hyun, Jinho Informa UK (TaylorFrancis) 2008 Journal of biomaterials science, Polymer edition Vol.19 No.2
<P>This paper investigates the chemical modification of a cell-repellent poly(ethylene glycol) (PEG)-based polymer to enhance its hydrophilicity with sulfonate groups, and its application in the fabrication of a cell microarray. First, a polymer comprised of a methyl methacrylate (MMA) backbone with PEG side-chains (PMMA-b-PEG) was synthesized from three monomers by radical polymerization and purified. Despite the hydrophilic side-groups in the amphiphilic polymer, the backbone structure's hydrophobicity allows for local adsorption of biomolecules in incubation media with or without serum. To enhance the hydrophilicity of the polymer, we tethered sulfonate groups to the hydroxyl groups on the PEG side chains (PMMA-b-PEG-SO3). The sulfate groups' physical and mechanical movement competitively repels biomolecules approaching the PMMA-b-PEG surface. Polymers modified with sulfonate were characterized by contact angle measurement, FT-IR, NMR, AFM and GPC. PMMA-b-PEG and PMMA-b-PEG-SO3 were successfully micropatterned on polystyrene and glass surfaces, and cell attachment was performed in either serum-free or serum-containing media, resulting in highly resolved cell micropatterns.</P>
Realistic and aggregated exposure assessment of Korean men and women to color make-up products
Jung, Kyungeun,Choi, Misoo,Hong, Seungphil,Park, Byungcheol,Park, Ilyong,Shin, Jeonghyun,Lee, Taewon,Park, Gyeong-Hun,Kim, Myunghwa Elsevier 2018 Food and chemical toxicology Vol.118 No.-
<P><B>Highlights</B></P> <P> <UL> <LI> Our study provided realistic exposure data based on actual use of facial color makeup products, providing fundamental elements of exposure assessments, including amount of use, frequency of use, and various socioeconomic factors. </LI> <LI> Koreans were revealed to use smaller amounts of the color makeup products than Americans and Europeans, except for lip gloss/balm/stick, eyeliner, and eyebrow pencil. </LI> <LI> In addition, Koreans showed to use color cosmetics less frequently. </LI> </UL> </P>
Exposure data to facial makeup cosmetic products in Korean
( Kyungeun Jung ),( Misoo Choi ),( Seungphil Hong ),( Byungcheol Park ),( Jeonghyun Shin ),( Hakrim Kim ),( Taewon Lee ),( Kyubong Kim ),( Gyeong Hun Park ),( Myunghwa Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2
Backgrounds: Ingredients of cosmetic products (CPs) are able to pass in variable amount across the skin and mucosa. In particular, facial makeup products contain variety of probably hazard compounds such as colorant dyes, heavy metals, preservatives etc. To investigate the exposure data of 10 widely used facial makeup products, realistic exposure assessment study was undertaken. Subjects and method: 358 women and 79 men, aged 15-59 years, who use the facial makeup CPs of interest regularly, were recruited nationwide within 5 metropolitan cities in Korea. Essential information about the amounts of product applied and the frequency of use over a two week period. 10 facial make up CPs including liquid foundation(BB cream), lipstick, eyeliner, eyeshadow, etc.Men were investigated for lip gloss, lip balm, and liquid foundation. The subjects recorded detailed daily usage information over the 2 weeks period. Products were weighed before and after the study period to determine the total amount of product used. Result: 20’s aged women used more lip gloss, lip balm, and eyeliner. 30’s aged women used more eyeshadow. 40-50’s aged women used more amounts of lipstick. The daily use amount of liquid foundation (0.161g), lipstick (0.010g), eye shadow (0.007g) was lower than that of European and American previous studies. The daily useamount of eyeliner (0.006g) was higher than that of European report. Men used similar amount of BB creamand less amount of lip gloss and lip balm comparing with women. Conclusion: We provide provisional database containing exposure information of facial makeup CPs. It can be a fundamental cornerstone for makeup CPs safety assessment.