21세기 국가경쟁력강화방안에 관한 연구 : Focused on the Environmental & Information strategy 환경 및 정보화 전략을 중심으로

金秉辰,權祈憲,金承泰,金進昱 慶熙大學校 社會科學硏究院 行政硏究所 2000 行政問題硏究 Vol.7 No.1

초음파 가이드를 통한 맥락막상강출혈의 치료

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.

Wireless LAN을 위한 BST 박막 가변 대역통과 여파기 설계

김기병(Ki-Byoung Kim),윤태순(Tae-Soon Yun),김종호(Jong-Ho Kim),김일두(Il-Doo Kim),임미화(Mi-Hwa Lim),김호기(Ho-Gi Kim),김종헌(Jong-Heon Kim),이병제(Byungje Lee),김남영(Nam-Young Kim),이종철(Jong-Chul Lee) 한국통신학회 2001 한국통신학회 학술대회논문집 Vol.2001 No.7

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>

Resection Plane-Dependent Error of CT Volumetry for Right Hepatic Lobe in Live Liver Donors

( Heon-ju Kwon ),( Kyoung Won Kim ),( Bohyun Kim ),( So Yeon Kim ),( Jeongjin Lee ),( Gi Won Song ),( Sung Gyu Lee ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1

Aims: CT hepatic volumetry is currently accepted as the most reliable method for preoperative assumption of the graft weight for living donor liver transplantation. However, the estimated value from CT volumetry can be deviated from real graft weight due to several factors including the difference between the preoperative assumptive and the actual hepatectomy planes. It may be worthwhile to determine how much each factor contributes to the error of CT volumetry. Thus, the purpose of this study was to determine the resection plane-dependent error of CT volumetry for right hepatic lobe in live liver donors. Methods: Forty-six live liver donors underwent CT scans ≤2 months before the liver procurement and within postoperative day 7. CT volumetry was performed by two radiologists in consensus using a computer-aided liver volumetry software. Prospective CT volumetry (VP) was measured with assumptive hepatectomy plane. Retrospective liver volume (VR) was measured using actual plane determined by comparing preoperative and postoperative CT scans. Compared with intraoperatively measured weight (W), errors of percentage (%) VP and VR were evaluated. Plane-dependent error of VP was defined as absolute difference between VP and VR. % plane-dependent error was defined as follow:|VP-VR|/W·100. Results: Mean VP, VR, and W were 761.9 mL, 755.0 mL, and 696.9g. Mean and % errors of VP were 73.3 mL and 10.7%. Mean error and % error of VR were 64.4 mL and 9.3%. Mean plane-dependent error of VP was 32.4 mL. Mean % plane-dependent error was 4.7%. The plane-dependent error of VP exceeded 10% of W in approximately 10% of the subjects in our study. Conclusions: There is approximately 5% plane-dependent error for VP at CT volumetry. However, even with correction of plane-dependent error, error of VR is still approximately 9% compared with W.

Plastic-Based Organic Thin-Film Transistors with Thermally Cured Polymeric Gate Dielectrics

Gi Heon Kim,Chul Am Kim,In-Kyu You,Kyu-Ha Baek,Kyung Soo Suh,Seong Deok Ahn,Seong Youl Kang,윤성민 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3

In this investigation, we synthesized thermally curable polymers by mixing poly(vinyl phenol) (PVP) and a thermal-crosslinking agent (a methylated melamine-formaldehyde, MMF). These polymeric insulating films exhibit good chemical, physical, and electrical properties as dielectrics. Their insulating and dielectric properties depend on the MMF concentration. We fabricated plastic-based organic thin-film transistors (OTFTs) with these dielectric layers to investigate the relationship between the performance of the OTFT and the electrical/chemical properties of these insulating films. The OTFT showed good electrical performance; the field-effect mobility was 1.1 cm2V.1s.1. A dielectric layer with a relatively low dielectric constant was found to give a higher field-effect mobility.

Oxide-silicon-oxide buffer structure for ultralow temperature polycrystalline silicon thin-film transistor on plastic substrate

Kim, Yong-Hae,Chung, Choong-Heui,Moon, Jaehyun,Kim, Gi Heon,Park, Dong-Jin,Kim, Dae-Won,Lim, Jung Wook,Yun, Sun Jin,Song, Yoon-Ho,Lee, Jin Ho IEEE 2006 IEEE electron device letters Vol.27 No.7

A novel oxide-silicon-oxide buffer structure to prevent damage to a plastic substrate in an ultralow temperature (<120°C) polycrystalline silicon thin-film transistor (ULTPS TFT) process is presented. Specifically, an amorphous silicon film was inserted as an absorption layer into buffer oxide films. The maximum endurable laser energy was increased from 200 to 800 mJ/cm<SUP>2</SUP>. The fabricated ULTPS nMOS TFT showed a performance with mobility of 30 cm<SUP>2</SUP>/Vs.

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

Soybean transgenic plants with ectopically expressed AtABF3 were produced by Agrobacterium-mediated transformation and investigated the effects of AtABF3 expression on drought and salt tolerance. Stable Agrobacterium-mediated soybean transformation was carried based on the half-seed method (Paz et al. 2006). The integration of the transgene was confirmed from the genomic DNA of transformed soybean plants using PCR and the copy number of transgene was determined by Southern blotting using leaf samples from $T_2$ seedlings. In addition to genomic integration, the expression of the transgenes was analyzed by RT-PCR and most of the transgenic lines expressed the transgenes introduced. The chosen two transgenic lines (line #2 and #9) for further experiment showed the substantial drought stress tolerance by surviving even at the end of the 20-day of drought treatment. And the positive relationship between the levels of AtABF3 gene expression and drought-tolerance was confirmed by qRT-PCR and drought tolerance test. The stronger drought tolerance of transgenic lines seemed to be resulted from physiological changes. Transgenic lines #2 and #9 showed ion leakage at a significantly lower level (P < 0.01) than ${\underline{n}}on-{\underline{t}}ransgenic$ (NT) control. In addition, the chlorophyll contents of the leaves of transgenic lines were significantly higher (P < 0.01). The results indicated that their enhanced drought tolerance was due to the prevention of cell membrane damage and maintenance of chlorophyll content. Water loss by transpiration also slowly proceeded in transgenic plants. In microscopic observation, higher stomata closure was confirmed in transgenic lines. Especially, line #9 had 56% of completely closed stomata whereas only 16% were completely open. In subsequent salt tolerance test, the apparently enhanced salt tolerance of transgenic lines was measured in ion leakage rate and chlorophyll contents. Finally, the agronomic characteristics of ectopically expressed AtABF3 transgenic plants ($T_2$) compared to NT plants under regular watering (every 4 days) or low rate of watering condition (every 10 days) was investigated. When watered regularly, the plant height of drought-tolerant line (#9) was shorter than NT plants. However, under the drought condition, total seed weight of line #9 was significantly higher than in NT plants (P < 0.01). Moreover, the pods of NT plants showed severe withering, and most of the pods failed to set normal seeds. All the evidences in the study clearly suggested that overexpression of the AtABF3 gene conferred drought and salt tolerance in major crop soybean, especially under the growth condition of low watering.

Tunable Band-pass Filters using Ba_0.5Sr_0.5TiO₃ Thin Films for Wireless LAN Application

Kim, Ki-Byoung,Yun, Tae-Soon,Lee, Jong-Chul,Kim, Il-Doo,Lim, Mi-Hwa,Kim, Ho-Gi,Kim, Jong-Heon,Lee, Byungje,Kim, Na-Young The Korean Institute of Electromagnetic Engineerin 2002 한국전자파학회논문지 Vol.13 No.8

In this paper, the performance of Au / $Ba_{0.5}Sr_{0.5}TiO_3$ (BST) / Magnesium oxide (MgO) two-layered electrically tunable band-pass Filters (BPFs) is demonstrated. The devices consist of microstrip, coplanar waveguide (CPW), and conductor-backed coplanar waveguide (CBCPW) structures. These BST thin film band-pass filters have been designed by the 2.5 D field simulator, IE3D, Zeland Inc., and fabricated by thin film process. The simulation results, using the 2-pole microstrip, CPW, and CBCPW band-pass filters, show the center frequencies of 5.89 GHz, 5.88 GHz, and 5.69 GHz, and the corresponding insertion losses are 2.67 dB, 1.14 dB, and 1.60 dB, with 3 %, 9 %, and 7 % bandwidth, respectively. The measurement results show the center frequencies of 6.4 GHz, 6.14 GHz, and 6.04 GHz, and their corresponding insertion losses are 6 dB, 4.41 dB, and 5.41 dB, respectively, without any bias voltage. With the bias voltage of 40 V, the center frequencies for the band-pass filters are measured to be 6.61 GHz, 6.31 GHz, and 6.21 GHz, and their insertion losses are observed to be 7.33 dB, 5.83 dB, and 6.83 dB, respectively. From the experiment, the tuning range for the band-pass filters are determined as about 3 % ~ 8 %. 본 논문은 $Ba_{0.5}$Sr$_{0.5}$TiO$_3$(BST) 박막을 이용한 대역 통과 여파기를 설계, 제작한 것으로 마이크로스트립 과 코플래너 웨이브가이드(CPW), CBCPW 전송 선로 구조에서 각 구조의 여파기 특성을 비교하였다. 제작된 여파기는 전압 0V 인가시 각각 6.4 GHz, 6.14 GHz, 6.04 GHz의 중심 주파수와 6 dB, 4.41 dB, 5.41 dB의 삽입 손실이 측정되었으며, 40V 인가시 중심 주파수 6.61 GHz, 6.31 GHz, 6.21 GHz와 삽입 손실 7.33 dB, 5.83 dB, 6.83 dB로 나타났다. 본 논문에서 제작된 각각의 대역 통과 야파기는 가변 범위가 약 3 % - 8 %이며, 무선랜 대역에 응용할 수 있도록 설계 및 제작되었다.다.