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Kim, Hyun‐,Ouk,Kim, Eunjung,An, Yonghee,Choi, Jihye,Jang, Eunji,Choi, Eun Bi,Kukreja, Aastha,Kim, Myeong‐,Hoon,Kang, Byunghoon,Kim, Dong‐,Joo,Suh, Jin‐,Suck,Huh, Yong‐,Mi WILEY‐VCH Verlag 2013 Macromolecular bioscience Vol.13 No.6
<P><B>Abstract</B></P><P>Combined cancer treatment via co‐delivery of siRNAs and an anticancer drug can be a promising strategy due to the synergistic effect of simultaneously minimizing gene/drug administration. In this study, Bcl‐xL siRNA and doxorubicin (DOX) are encapsulated into designed methoxy‐poly(ethylene glycol)‐<I>block</I>‐poly(<SMALL>D</SMALL>,<SMALL>L</SMALL>‐lactic acid) (mPEG‐<I>b</I>‐PLA) block copolymer polymersomes (PSomes). A study of the cytotoxicity of Bcl‐xL siRNA and DOX co‐encapsulated PSomes (CPSomes) shows more inhibited proliferation of MKN‐45 and MKN‐28 human gastric cancer cell lines than only gene‐ and drug‐loaded ones. Consequently, these results demonstrate that co‐delivery of genes and drugs using PSomes results in a synergistic efficacy and indicates the potential of PSomes as efficient nanocarriers for combined cancer therapy. </P>
펨토초레이저 백내장수술 후 건성안에 대한 0.15% 무보존제 히알루론산나트륨의 임상적 효과
김태환(Tae Hwan Kim),정병훈(Byunghoon Chung),김강윤(Kang Yoon Kim),전익현(Ikhyun Jun),서경률(Kyoung Yul Seo),김응권(Eung Kweon Kim),김태임(Tae-im Kim) 대한안과학회 2021 대한안과학회지 Vol.62 No.7
목적: 펨토초레이저 백내장수술 후 발생하는 건성안에 대한 0.15% 무보존제 히알루론산나트륨 점안액의 임상적 효과를 분석하고자 하였다. 대상과 방법: 본원에서 진료 중인 건성안 환자들 중 펨토초레이저 백내장수술을 시행한 총 37안을 대상으로 수술 후 0.15% 무보존제히알루론산나트륨 점안액을 사용한 치료군 19안, 사용하지 않은 대조군 18안에 대해 수술 전, 후 1, 3개월째 각결막형광염색점수, 눈물막파괴시간, 1형 쉬르머검사, 안구표면질환지수, 눈꺼풀 마이봄샘 평가, 눈물 지질층 두께를 측정하였다. 결과: 치료군에서는 수술 후 3개월째 안구표면질환지수의 유의한 감소, 눈물막파괴시간의 증가, 각결막형광염색점수의 감소, 1형 쉬르머검사의 유의한 증가가 확인된 반면, 대조군에서는 수술 후 1, 3개월째 유의한 쉬르머검사의 감소, 1개월째 마이봄샘 성상 악화, 3개월째 눈물막파괴시간 감소가 관찰되었다. 안구표면질환지수는 수술 후 1, 3개월째 치료군에서 유의하게 낮았으며, 눈물막파괴시간은 수술 후 3개월째 치료군에서 유의하게 높게 나타났다. 또한 수술 후 3개월째 치료군에서 마이봄샘 성상이 유의하게 좋은 결과를 보였다. 이외에 각결막형광염색점수와 눈물 지질층 두께를 포함한 다른 건성안 지표에 대해서는 치료군과 대조군 간 유의한 차이를 보이지 않았다. 결론: 펨토초레이저 백내장수술 후 무보존제 0.15% 히알루론산나트륨 점안액 사용은 수술 후 발생하는 건성안 증상을 경감시키고 눈물막 안정성 향상에 도움을 줄 수 있다. Purpose: The efficacy of using preservative-free 0.15% sodium hyaluronate eyedrops for dry eye disease after femtosecond laser- assisted cataract surgery (FLACS) was evaluated. Methods: This prospective randomized study was conducted on patients with dry eye who were scheduled for FLACS among those with Tear Film & Ocular Surface Society Dry Eye Workshop II Dry Eye Levels 1 and 2. In total, 37 eyes scheduled for FLACS were randomized to the treatment group (n = 19) or control group (n = 18). Corneal and conjunctival fluorescein staining (CFS), tear breakup time (TBUT), Schirmer I test (SIT) value, ocular surface disease index (OSDI), meibomian gland evaluation result, and lipid layer thickness were evaluated for all patients, preoperatively and at 1 and 3 months postoperatively. Results: In the treatment group, the OSDI and CFS scores were significantly lower at 3 months postoperatively than at baseline, but the TBUT and SIT values were significantly increased. In the control group, TBUT was significantly shorter at 3 months postoperatively than at baseline, SIT values were significantly decreased at 1 and 3 months postoperatively compared with the baseline, and meibum quality was significantly aggravated at 1 month postoperatively compared with the baseline. In the treatment group, OSDI improved significantly from baseline at 1 and 3 months. TBUT increased significantly in the treatment group at postoperative 3 months. Meibomian gland quality showed clinically better results in the treatment group than in the control group at postoperative 3 months. There were no significant differences in corneal and CFS, lipid layer thickness, and other dry eye disease parameters between the treatment and control groups. Conclusions: Preservative-free 0.15% sodium hyaluronate eyedrops were effective for improving dry eye symptoms and tear film stability after FLACS.
Byunghoon Kim,Young-Seon Jeong,Seung Hoon Tong,In-Kap Chang,Myong-Kee Jeong IEEE 2016 IEEE transactions on semiconductor manufacturing Vol.29 No.1
<P>Defects on semiconductor wafers are not uniformly distributed, but tend to cluster. These spatial defect patterns contain useful information about issues during integrated circuit fabrication. Promptly detecting abnormal wafers is an important way to increase yield and product quality. However, research on identifying spatial defect patterns has focused only on flash memory with a single wafer map. No procedure is available for identifying spatial defect patterns on dynamic random access memory (DRAM) with multiple wafer maps. This paper proposes a new step-down spatial randomness test for detecting abnormalities on a DRAM wafer with multiple spatial maps. We adopt nonparametric Gaussian kernel-density estimation to transform the original fail bit test (FBT) values into binary FBT values. We also propose a spatial local de-noising method to eliminate noisy defect chips to distinguish the random defect patterns from systematic ones. We experimentally validated the proposed procedure using real-life DRAM wafers. These experimental results demonstrate that our approach can viably replace manual detection of abnormal DRAM wafers.</P>
Kim, Byunghoon,An, Jungkwen,Yu, Yongli,Cheng, Ya,Xu, Zhizhan,Kim, Dong Eon The Optical Society 2008 Optics express Vol.16 No.14
<P>The effect of the mixing of pulsed two color fields on the generation of an isolated attosecond pulse has been systematically investigated. One main color is 800 nm and the other color (or secondary color) is varied from 1.2 to 2.4 microm. This work shows that the continuum length behaves in a similar way to the behavior of the difference in the square of the amplitude of the strongest and next strongest cycle. As the mixing ratio is increased, the optimal wavelength for the extended continuum shifts toward shorter wavelength side. There is a certain mixing ratio of intensities at which the continuum length bifurcates, i.e., the existence of two optimal wavelengths. As the mixing ratio is further increased, each branch bifurcates again into two sub-branches. This 2D map analysis of the mixing ratio and the wavelength of the secondary field easily allows one to select a proper wavelength and the mixing ratio for a given pulse duration of the primary field. The study shows that an isolated sub-100 attosecond pulse can be generated mixing an 11 fs full-width-half-maximum (FWHM), 800 laser pulse with an 1840 nm FWHM pulse. Furthermore the result reveals that a 33 fs FWHM, 800 nm pulse can produce an isolated pulse below 200 as, when properly mixed.</P>
Byunghoon Chung,Hun Lee,Bong Joon Choi,Kyung Ryul Seo,Eung Kwon Kim,Dae Yune Kim,Tae-im Kim 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.1
Purpose: The purpose of this study was to investigate the clinical efficacy of an optimized prolate ablation procedure for correcting residual refractive errors following laser surgery. Methods: We analyzed 24 eyes of 15 patients who underwent an optimized prolate ablation procedure for the correction of residual refractive errors following laser in situ keratomileusis, laser-assisted subepithelial keratectomy, or photorefractive keratectomy surgeries. Preoperative ophthalmic examinations were performed, and uncorrected distance visual acuity, corrected distance visual acuity, manifest refraction values (sphere, cylinder, and spherical equivalent), point spread function, modulation transfer function, corneal asphericity (Q value), ocular aberrations, and corneal haze measurements were obtained postoperatively at 1, 3, and 6 months. Results: Uncorrected distance visual acuity improved and refractive errors decreased significantly at 1, 3, and 6 months postoperatively. Total coma aberration increased at 3 and 6 months postoperatively, while changes in all other aberrations were not statistically significant. Similarly, no significant changes in point spread function were detected, but modulation transfer function increased significantly at the postoperative time points measured. Conclusions: The optimized prolate ablation procedure was effective in terms of improving visual acuity and objective visual performance for the correction of persistent refractive errors following laser surgery.
Killing efficiency of Vibrio parahaemolyticus by TiO₂ Photocatalytic Reactor
Kim, Byunghoon,Cho, Donglyun 한국공업화학회 2003 응용화학 Vol.7 No.2
Titanium dioxide (TiO₂) photocatalysts have attracted great attention as a material for photocatalytic sterilization in the food and environmental industry. The aim of this study was to design a new photocatalytic reactor and its application to sterilize Vibrio parahaemolyticus. The photocatalytic reaction was carried out with various flow rate of cell suspension and ultraviolet(UV)-A illumination time. In the bactericidal efficiency of photocatalytic reactor on V. parahaemolyticus, it was confirmed that UV-A illumination time and flow rate affected the cell killing activity. After 60min UV-A illumination, killing activity of V. parahaemolyticus was more than 99.9%.