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.

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.

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.

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.

Reduction of Gamma Distortion in Oblique Viewing Directions in Polymer-stabilized Vertical Alignment Liquid Crystal Mode

Kim, Hyo Joong,Lim, Young Jin,Murali, G.,Kim, Min Su,Kim, Gi Heon,Kim, Yong Hae,Lee, Gi-Dong,Lee, Seung Hee Optical Society of Korea 2017 Current Optics and Photonics Vol.1 No.2

In large liquid crystal displays, the image quality in an oblique viewing direction is a crucial issue. From this perspective, 8-domain polymer-stabilized vertical alignment (PS-VA) mode has been developed to suppress the color shift in oblique viewing directions, compared to that in 4-domain PS-VA mode. To realize the 8-domain PS-VA, the four domains in a pixel are each divided into two regions, such that applying different electric potentials result in different tilt angles in these two regions, while keeping four azimuthal directions in each domain. However, applying different voltages in a pixel causes drawbacks, such as requiring additional processes to construct a capacitor and a transistor, which will further reduce the aperture ratio. Here we propose a different approach to form the 8-domain, by controlling surface polar anchoring energy and the width of patterned electrodes in two regions of a pixel. As a result, the gamma-distortion index (GDI), measured at an azimuthal angle of $0^{\circ}$, is reduced by about 23% and 8%, compared to that of a conventional 4-domain at polar angles of $30^{\circ}$ and $60^{\circ}$ respectively.

Current Status and Technical Issues of High Heat-Resistance Polyimides for Flexible Display

Gi Heon Kim(김기현) 한국고분자학회 2022 한국고분자학회 학술대회 연구논문 초록집 Vol.47 No.2

Erratum to: Confirmation of Drought Tolerance of Ectopically Expressed <i>AtABF3</i> 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.7

Resection plane-dependent error in computed tomography volumetry of the right hepatic lobe in living liver donors

( Heon-ju Kwon ),( Kyoung Won Kim ),( Bohyun Kim ),( So Yeon Kim ),( Chul Seung Lee ),( Jeongjin Lee ),( Gi Won Song ),( Sung Gyu Lee ) 대한간학회 2018 Clinical and Molecular Hepatology(대한간학회지) Vol.24 No.1

Background/Aims: Computed tomography (CT) hepatic volumetry is currently accepted as the most reliable method for preoperative estimation of graft weight in living donor liver transplantation (LDLT). However, several factors can cause inaccuracies in CT volumetry compared to real graft weight. The purpose of this study was to determine the frequency and degree of resection plane-dependent error in CT volumetry of the right hepatic lobe in LDLT. Methods: Forty-six living liver donors underwent CT before donor surgery and on postoperative day 7. Prospective CT volumetry (V< SUB >P< /SUB >) was measured via the assumptive hepatectomy plane. Retrospective liver volume (V< SUB >R< /SUB >) was measured using the actual plane by comparing preoperative and postoperative CT. Compared with intraoperatively measured weight (W), errors in percentage (%) V< SUB >P< /SUB > and V< SUB >R< /SUB > were evaluated. Plane-dependent error in V< SUB >P< /SUB > was defined as the absolute difference between V< SUB >P< /SUB > and V< SUB >R< /SUB >. % plane-dependent error was defined as follows: |V< SUB >P< /SUB >-V< SUB >R< /SUB >|/W·100. Results: Mean V< SUB >P< /SUB >, V< SUB >R< /SUB >, and W were 761.9 mL, 755.0 mL, and 696.9 g. Mean and % errors in V< SUB >P< /SUB > were 73.3 mL and 10.7%. Mean error and % error in V< SUB >R< /SUB > were 64.4 mL and 9.3%. Mean plane-dependent error in V< SUB >P< /SUB > was 32.4 mL. Mean % planedependent error was 4.7%. Plane-dependent error in V< SUB >P< /SUB > exceeded 10% of W in approximately 10% of the subjects in our study. Conclusions: There was approximately 5% plane-dependent error in liver V< SUB >P< /SUB > on CT volumetry. Plane-dependent error in V< SUB >P< /SUB > exceeded 10% of W in approximately 10% of LDLT donors in our study. This error should be considered, especially when CT volumetry is performed by a less experienced operator who is not well acquainted with the donor hepatectomy plane. (Clin Mol Hepatol 2018;24:54-60)

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>