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Choi, Danbi,Ahn, Byungcheol,Kim, Se Hyun,Hong, Kipyo,Ree, Moonhor,Park, Chan Eon American Chemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.1
<P>The effects of spin speed and an amorphous fluoropolymer (CYTOP)-patterned substrate on the crystalline structures and device performance of triisopropylsilylethynyl pentacene (TIPS-PEN) organic field-effect transistors (OFETs) were investigated. The crystallinity of the TIPS-PEN film was enhanced by decreasing the spin speed, because slow evaporation of the solvent provided a sufficient time for the formation of thermodynamically stable crystalline structures. In addition, the adoption of a CYTOP-patterned substrate induced the three-dimensional (3D) growth of the TIPS-PEN crystals, because the patterned substrate confined the TIPS-PEN molecules and allowed sufficient time for the self-organization of TIPS-PEN. TIPS-PEN OFETs fabricated at a spin speed of 300 rpm with a CYTOP-patterned substrate showed a field-effect mobility of 0.131 cm<SUP>2</SUP> V<SUP>–1</SUP> s<SUP>–1</SUP>, which is a remarkable improvement over previous spin-coated TIPS-PEN OFETs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-1/am201074n/production/images/medium/am-2011-01074n_0007.gif'></P>
Yun Jeong Choi,Byungcheol Kim,Jeongsik Lee,Jongtaik Lee 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3
There is a growing appreciation, amongst academics as well as policy makers, of the critical role small- and medium-sized enterprises play in the economy. But, it is reported that there is a positive relationship between firm size and the frequency of assessing certain information sources such as sector legislation, annual reports, and external consulting. The difference of information acquisition capability between SMEs and large firms is partially attributable to SMEs’ limited resources such as financial constraints, and lack of employees available for gathering information and analyzing them. To break the vicious circle, policymakers for SMEs are encouraged to develop appropriate schemes to enable SMEs to use external consulting or make useful information for SMEs more available in the public domain.
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>
Study for Roles of Major Players in Technology Commercialization Processes and their Case Studies
Jongtaik Lee,Jeongsik Lee,Byungcheol Kim,Yun Jeong Choi 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.2
Technology commercialization network platform includes several major players such as principal investigators, technology licensing offices, accelerators or incubators, innovation capitalist, local governments and they have their own specific roles in enabling or facilitating the transition from embryonic technologies to markets. This study includes case studies involved with major players in technology commercialization processes as well as their roles, and case studies focus on the case of Georgia Institute of Technology and the State of Georgia for a more effective discussion. Particular interests are paid in the information flow between, and the incentives for, each of these network participants.
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.
( Chanhee Nam ),( Minkee Park ),( Misoo Choi ),( Eunhee Choi ),( Byungcheol Park ),( Myunghwa Kim ),( Seung Phil Hong ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2
Background: Low level laser therapy(LLLT) using light emitting diode(LED) is a non-thermal and non-invasivetreatment which stimulates cell activities and functions through a photobiomodulative effect. Objectives: We performed a prospective, randomized, double-blinded, comparative trial to evaluate the efficacy and safety of two LLLT devices using monochromatic 660 nm emitted red or polychromatic 411-777 nm emitted white LED on the facial wrinkles. Methods: A total of 52 adult female subjects with more than grade 3 of lateral periocular wrinkle were randomly divided into two groups, red LED and white LED group.The face of subjects was eradiated with 5 J of red LED or white LED for 12 weeks. Results: In both groups of red LED and white LED, the wrinkle measurement from skin replica on the bilateral periorbital area improved significantly from baseline at week 12. Red LED group showed slightly better improvement, but there were no statistical differences. In investigator``s assessment, the wrinkle grade showed nostatistical differences within groups as well as between groups. In subject’s global assessment, the mean improvement score of red LED group was significantly higher than that of the white LED group. Total 12 cases of adverse reactions were reported during the study period, but most of them were mild and self-limited. There were no statistical differences between two groups. Conclusion: Monochromatic 660 nm red LED could be an effective and tolerable treatment option for wrinkles.