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Influence of Glycogen on the performance of dye-sensitized solar cells
Youngsam Jung(정영삼),Chunghee Kwak(곽정희),Youngbin Oh(오영빈),Yousub Bang(방유섭),Seowang Park(박서왕),Inhyeok Jeong(정인혁),Jaehyuk Lee(이재혁),Younghun Kim(김영훈),Seokhyeon Hong(홍석현),Taehyun Kim(김태현),Uiseok You(유의석),Seo 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05
Youngsam Kim 대한수의학회 2023 Journal of Veterinary Science Vol.24 No.2
Background: The association between vitamin D and canine keratoconjunctivitis sicca (KCS) has not been investigated in dogs. Objectives: To investigate the association of serum 25-hydroxyvitamin D [25(OH)D] concentrations with Schirmer tear test 1 (STT-1) and tear film breakup time (TFBUT) in dogs. Methods: Sixty-one clinically healthy, client-owned dogs were enrolled. STT-1 and TFBUT were measured in 122 (61dogs) and 82 (41 dogs out of total 61 dogs) eyes, respectively. Serum 25(OH)D concentrations were evaluated by quantitative chemiluminescent immunoassay. The dogs were classified into 6 groups according to the evaluations (STT-1: group 1, normal [≥ 15 mm/min] in both eyes; group 2, normal in one eye and abnormal [< 15 mm/min] in the fellow eye; group 3, abnormal in both eyes; TFBUT: group 4, normal [≥ 20 sec] in both eyes; group 5, normal in one eye and abnormal [< 20 sec] in the fellow eye; group 6, abnormal in both eyes). Results: STT-1 was positively correlated with TFBUT (p < 0.001). Among the STT-1 groups, the mean serum 25(OH)D concentration in group 1 was significantly higher than in groups 2 and 3 with positive correlation (p < 0.001). However, there were no significant differences among the TFBUT groups 4, 5, and 6. Conclusions: In dogs, it was found that serum 25(OH)D concentrations had a greater effect on quantitative KCS than qualitative KCS. Therefore, it is considered that measurement of serum 25(OH)D concentration could be included in the diagnostic tests in canine quantitative KCS patients.
Organic dyes containing phenothiazine for dye-sensitized solar cells
Youngsam Jung(정영삼),Chung hee Kwak(곽정희),San Kang(강산),Seungwoo Hong(홍승우),Jaehwan Rho(노재환),Seunghoon Song(송승훈),Bumsoo Park(박범수),Minseong Park(박민성),Hyunggi Ann(안형기),Jimin Seo(서지민),Yoonchan Han(한윤찬) 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05
Youngsam Yoon,Dong-Weon Lee,Jeong-Bong Lee IEEE 2013 Journal of microelectromechanical systems Vol.22 No.5
<P>We report an extremely simple method of making an optically transparent superhydrophobic polydimethyl-siloxane (PDMS) thin film using underexposed and underbaked positive photoresist (PR) mold. Significant under soft-bake condition makes PR retain good amount of solvents, which greatly increases the dissolution rate of the PR during developing. A combination of optimal underbaking and underexposure condition created a unique hierarchical micro-/nano- structure on the PR mold, and inverse image of the PR mold was replicated to create a hierarchical micro/nano structured broccoli-shaped PDMS thin film. A 100-nm-thick fluorocarbon film was optionally deposited on the broccoli-shaped PDMS film to further enhance superhydrophobicity. Advancing and receding angles of the film for 4- μL water droplet were found to be 161.33±0.763<SUP>°</SUP> and 133.33±0.29<SUP>°</SUP>, respectively, showing superhydrophobicity. It was also found that the optical transmittance at around 550 nm for this PDMS film was approximately 90%.</P>
Youngsam Kim,Baesun Dong,Jaewon Jo,Kwang W. Kim 한국도로학회 2018 한국도로학회 학술대회 발표논문 초록집 Vol.2018 No.05
When there is a significant stripping in asphalt pavement, it is common practice to use a hydrated lime (HL) as an anti-stripping additive (ASA). However, since many asphalt plants do not have facilities for weighing and casting HL, they prefer to use of a liquid-type ASA (LA). Therefore, various brands of LAs which show proper anti-stripping function are currently developed, imported, and marketed in Korea. In addition to the anti-stripping effect, the HL has been known to give a significant age-retarding effect on paved asphalt in the field. Therefore, there was a question about whether or not the LA provides the same anti-aging effect as The HL. This study investigated anti-aging effect of the asphalt mixes which were prepared using both ASAs and short-term aged and long-term aged in the laboratory. The absolute viscosity was measured as an aging index from the binder recovered from the mixes after short-term aging (STA) and long-term aging (LTA) processes. The results showed that there was a significant higher aging found from the LA-added mix than the normal mix without any ASA. On the other hands, the mix with HL showed significantly lower ageing level than the LA-added mix and normal mix. The retardation of age-hardening by using HL was more effectively observed when the STA condition was stronger.
Reference values for selected dry eye tests in normal Beagle dogs: a pilot study
Youngsam Kim,Seonmi Kang,Sunhyo Kim,Jaeho Shim,Seokmin Go,Kangmoon Seo 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.1
Background: Dry eye disease (DED) cannot be diagnosed by a single test because it is a multifactorial disorder of the ocular surface. Although studies on various dry eye tests (DETs) in dogs have been reported, standard criteria have not been established except for the Schirmer tear test 1 (STT-1). Objectives: To establish reference values for DETs in dogs with normal STT-1 values (≥ 15 mm/min) and to analyze the correlation between DETs. Methods: The STT-1 was performed in 10 healthy Beagle dogs (20 eyes). After 20 min, interferometry (IF) for estimating the lipid layer thickness (LLT) of the tear film, tear meniscus height (TMH), non-invasive tear breakup time (NIBUT), and meibomian gland loss rate of the upper eyelid (MGLRU) and lower eyelid (MGLRL), were measured using an ocular surface analyzer. Results: Mean values for STT-1, TMH, and NIBUT were as follows: 21.7 ± 3.4 mm/min, 0.41 ± 0.21 mm, and 19.1 ± 9.5 sec, respectively. The most frequent LLT range, measured by IF, was 30–80 nm (11 eyes), followed by 80 nm (5 eyes) and 80–140 nm (4 eyes). MGLRU ≤ 25% was measured in 11 eyes and 26%–50% in 9 eyes; MGLRL ≤ 25% in 8 eyes and 26%–50% in 12 eyes. Besides positive correlation between TMH and NIBUT (P = 0.038), there were no significant associations between DETs. Conclusions: Data obtained in this study provided normative references that could be useful for diagnosing DED and for further research into correlation between DETs in dogs with DED.