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이기헌,유재호,김태원,이상준,김신동 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1
Purpose : Intraoperative suprachoroidal hemorrhage is one of the most serious complications. We report a case of suprachoroidal hemorrhage during phacoemulsification surgery, was managed properly. Methods : Suprachoroidal hemorrhage occurred during phacoemulsificaiton in other hospital. The patient was referred to our department immediately after closing the surgical wound. On initial examination, iris and vitreous were prolapsed through surgical wound. Ciliary body was closely place to anterior chamber, and retina was not visible. Results : Prolapased ocular tissue were reduced by emergency operation. We controlled the patient’s intraocular pressure and inflammation. Ultrasonography was repeatedly performed to check the degree of liquefaction of suprachoroidal hemorrhage. After 9 days of suprachoroidal hemorrhage onset, vitrectomy and drainage through sclera was performed. Postoperative state was stable with successful removal of suprachoroidal hemorrhage. After 2 weeks of secondary operation, retinal detachment has occurred on nasal retinal area, so we performed scleral buckling and endolaser photocoagulation. After 6 months, retina was attached well and intraocular pressure was in normal range. Conclusion : In suprachoroidal hemorrhage, drainage of suprachoroidal hemorrhage after liquefaction of thrombi is effective. After successful drainage, postoperative complications may accompany such as retinal detachment or elevation of intraocular pressure. 목적 : 술중 발생하는 맥락막상 출혈은 매우 심각한 합병증이다. 저자는 수정체 유화술 중에 발생한 맥락막상 출혈을 적절히 대처한 증례를 보고하는 바이다. 대상과 방법 : 수정체 유화술 중 발생한 맥락막상강 출혈환자가 수술창을 봉합 후 즉시 본원으로 전원되었다. 초진시 홍채와 유리체가 수술창을 통해 탈출되어 있었으며, 전방을 통해 모양체가 확인되었으나, 망막은 보이지 않았다. 탈출된 안구내 조직을 응급수술을 통해 복원 후 환자의 안압과 염증을 조절하였다. 초음파를 반복적으로 실시하여 맥락막상 출혈의 액화 정도를 확인하였으며, 출혈 9일 후 유리체 절제술과 공막을 통한 배액술을 시행하였다. 결과 : 맥락막상 출혈이 성공적으로 제거되었으며 술 후 상태는 안정적이었다. 수술 2주 후 비측 망막 박리가 발생하여 공막돌륭술과 안구내 삽관 레이저술을 시행하였다. 6개월 후 망막은 잘 붙어있었으며, 안압은 정상 범위를 유지하였다. 결론 : 맥락막상 출혈의 경우 출혈의 배액 시기를 결정하는 것이 어렵지만, 규칙적인 초음파를 통해 배액술의 시기를 결정할 수 있다. 또한 맥락막상강 출혈의 성공적인 배액 이후에도 망막박리 및 안압상승과 같은 합병증의 동반에 대해 유념해야한다.
Preparation and Characterization of Cobalt/Graphene Composites Using Liquid Phase Plasma System.
Kim, Sang-Chai,Kim, Byung Hoon,Kim, Sun-Jae,Lee, Young-Seak,Kim, Hwan-Gi,Lee, Heon,Park, Sung Hoon,Jung, Sang-Chul American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.1
<P>Liquid phase plasma (LPP) method was applied, for the first time, to the impregnation of cabalt nanoparticles onto graphene. Nanoparticles were dispersed uniformly on the surface of the two-dimensional graphene sheet. The electron miocroscopy observation showed approximately 2-7 nm sized spherical nanoparticles deposited on the surface of graphene sheets. The XPS and EDX analyses revealed that both metal Co and CoO were present in the Co/graphene composites synthesized by the LPP method.</P>
High-Temperature–Short-Time Annealing Process for High-Performance Large-Area Perovskite Solar Cells
Kim, Minjin,Kim, Gi-Hwan,Oh, Kyoung Suk,Jo, Yimhyun,Yoon, Hyun,Kim, Ka-Hyun,Lee, Heon,Kim, Jin Young,Kim, Dong Suk American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Organic inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the past decade, their practical transition to large-size devices has been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large size grain domains of perovskite films over large areas. With high-temperature short-time annealing at 400 degrees C for 4 s, the perovskite film with an average domain size of 1 pm was obtained, which resulted in fast solvent evaporation. Solar cells fabricated using this processing technique had a maximum power conversion efficiency exceeding 20% over a 0.1 cm(2) active area and 18% over a 1 cm(2) active area. We believe our approach will enable the realization of highly efficient large-area PCSs for practical development with a very simple and short-time procedure. This simple method should lead the field toward the fabrication of uniform large-scale perovskite films, which are necessary for the production of high-efficiency solar cells that may also be applicable to several other material systems for more widespread practical deployment.</P>
Kim, So-Jung,Jeon, Da-Bin,Park, Jung-Ho,Ryu, Min-Ki,Yang, Jong-Heon,Hwang, Chi-Sun,Kim, Gi-Heon,Yoon, Sung-Min American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.8
<P>Nonvolatile memory thin-film transistors (TFTs) fabricated on paper substrates were proposed as one of the eco-friendly electronic devices. The gate stack was composed of chicken albumen gate insulator and In–Ga–Zn-O semiconducting channel layers. All the fabrication processes were performed below 120 °C. To improve the process compatibility of the synthethic paper substrate, an Al<SUB>2</SUB>O<SUB>3</SUB> thin film was introduced as adhesion and barrier layers by atomic layer deposition. The dielectric properties of biomaterial albumen gate insulator were also enhanced by the preparation of Al<SUB>2</SUB>O<SUB>3</SUB> capping layer. The nonvolatile bistabilities were realized by the switching phenomena of residual polarization within the albumen thin film. The fabricated device exhibited a counterclockwise hysteresis with a memory window of 11.8 V, high on/off ratio of approximately 1.1 × 10<SUP>6</SUP>, and high saturation mobility (μ<SUB>sat</SUB>) of 11.5 cm<SUP>2</SUP>/(V s). Furthermore, these device characteristics were not markedly degraded even after the delamination and under the bending situration. When the curvature radius was set as 5.3 cm, the <I>I</I><SUB>ON</SUB>/<I>I</I><SUB>OFF</SUB> ratio and μ<SUB>sat</SUB> were obtained to be 5.9 × 10<SUP>6</SUP> and 7.9 cm<SUP>2</SUP>/(V s), respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-8/am508834y/production/images/medium/am-2014-08834y_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am508834y'>ACS Electronic Supporting Info</A></P>
Development of high-resolution active matrix spatial light modulator
Kim, Yong-Hae,Hwang, Chi-Young,Choi, Ji Hun,Pi, Jae-Eun,Yang, Jong-Heon,Cho, Seong-M.,Cheon, Sang-Hoon,Kim, Gi Heon,Choi, Kyunghee,Kim, Hee-Ok,Lee, Won-Jae,Kang, Han-Byeol,Hwang, Chi-Sun SPIE - International Society for Optical Engineeri 2018 Optical engineering Vol.57 No.6
Erratum to: Confirmation of Drought Tolerance of Ectopically Expressed AtABF3 Gene in Soybean
Kim, Hye Jeong,Cho, Hyun Suk,Pak, Jung Hun,Kwon, Tackmin,Lee, Jai-Heon,Kim, Doh-Hoon,Lee, Dong Hee,Kim, Chang-Gi,Chung, Young-Soo Korean Society for Molecular and Cellular Biology 2018 Molecules and cells Vol.41 No.5
Effects of Aging Period Prior to Freezing on Meat Quality of Hanwoo Muscle (Longissimus dorsi)
Kim, Hyun-Wook,Lee, Eui-Soo,Choi, Yun-Sang,Choi, Ji-Hun,Han, Doo-Jeong,Kim, Hack-Youn,Song, Dong-Heon,Choi, Seul-Gi,Kim, Cheon-Jei Korean Society for Food Science of Animal Resource 2011 한국축산식품학회지 Vol.31 No.6
This study was conducted to evaluate the effect of the aging period prior to freezing on the meat quality of Hanwoo longissimus dorsi (LD) muscle. Three different combinations of aging and freezing periods (0/90, 20/70, and 40/50) were examined using LD muscle at 24 h postmortem under an identical storage time of 90 d. The pH and lightness slightly increased with increasing aging period. However, there were no significant (p>0.05) differences in redness and yellowness. The solitary freezing treatment (0/90) had the significantly (p<0.05) lowest moisture content. The un-aged treatment had a significantly (p<0.05) higher total loss than the aged treatments due to an increase in thaw drip loss. The aging significantly improved the myofibrillar fragmentation index and shear force of Hanwoo LD muscle (p<0.05). In addition, the aged treatments produced a higher flavor, tenderness, juiciness, and overall acceptability relative to un-aged treatment. However, there was no significant (p>0.05) difference in shear force and sensorial properties between 20 and 40 d aging prior to freezing. Therefore, 20 d aging prior to freezing may be a sufficiently effective strategy to improve the tenderness and sensorial properties of Hanwoo LD muscle.
Effects of boundary and bulk control technology in cholesteric liquid crystals
Kim, Gi Heon,Lee, Won-Jae,Kim, Han Na,Kim, Yong-Hae Taylor & Francis Inc. 2016 Molecular Crystals and Liquid Crystals Vol.633 No.1
<P>We fabricate a cholesteric liquid crystal display (Ch-LCD) having high reflectance and fast response time by doping R-811 into a nematic LC. The field-on and the field-off response times are 39 and 15 ms, respectively. The helical pitch is governed by R-811 that induced the cholesteric color. The boundary and bulk condition are strong effect on changes in the electro-optic behavior. The boundary condition controlled by rubbing strength has strong effects on the field-off response time and the reflectance variation. The bulk condition controlled by cell gap and R-811 concentration induced significant changes on operating voltage and threshold voltage.</P>