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이혜미,황창재,김재황,김흥대,박대팔,서일숙,송선옥,김세연,이덕희,지대림 영남대학교 의과대학 2007 Yeungnam University Journal of Medicine Vol.24 No.2
연구 배경 : 급성 신부전은 술 후 발생할 수 있는 합병증 중에서 사망률은 큰 영향을 줄 수 있으므로 이 연구를 통해 위험인자를 알아보려고 한다. 재료 및 방법 : 2004년 1월부터 2006년 12월까지 3년간 영남대학교 의과대학 부속병원에서 대장 수술을 받은 570명의 환자들을 대상으로 하였다. 환자들의 성별과 연령, 미국 마취과학회 신체등급, 동반질환, 수술의 종류, 응급수술의 여부, 수술 시간, 재수술의 여부, 술 중의 투약 상황, 술 후에 자가 통증 조절기에 사용한 약제, 술 중에 저혈압의 유무, 수혈 여부, 술 후 기계적 환기를 시행한 경우를 비교하였다. 결과 : 비교 결과에서 성별과 수술의 종류, 응급 수술의 여부, 개복여부 등에는 유의한 차이를 보이지 않았다. 반면 환자의 나이와 수술 시간, 재수술의 여부, 술중에 이뇨제 등을 사용한 경우, 술 중에 저혈압의 유무, 술 후에 기계적 환기를 시행한 경우 등에는 유의한 차이를 보였다. 결론 : 이상의 결과로 급성신부전의 원인은 어느 한 가지라고 하기 보다는 위험인자에 얼마나 노출되어 있는가가 결정하는 것 같고, 그 원인들이 모여서 상승효과를 내는 것 같다. 그러므로 수술 전부터 많은 위험에 노출된 환자는 술 중 더 적극적인 감시를 시행하여 수술 후의 합병증 발생을 줄이는 노력을 기울여야 하겠다. Background : Acute renal failure is one of the leading causes of postoperative morbidity and mortality. The purpose of this study was to determine the risk factors that are associated with acute renal failure after colorectal surgery. Materials and Methods : Five hundred seventy patients who operated colorectal surgery at the Yeungnam University Medical Center over three years from 2004 to 2006 were enrolled in this study. The effects of gender, age, ASA classification, concomitant disease, surgery type and duration, reoperation, urogenital manipulation, medication, hypotension, hypovolemia, transfusion, and postoperative ventilatory care on the occurrence of acute renal failure after colorectal surgery were studied. Results : The major risk factors of acute renal failure after colorectal surgery were age of patients (P=0.003), ASA classification (P<0.001), concomitant disease (P<0.001), duration of the time surgery (P=0.034), reoperation (P=0.001), use of intraoperative diuretics (P=0.005), use of postoperative diuretics (P<0.001), intraoperative hypotension (P=0.018), intraoperative transfusion (P<0.001), postoperative transfusion (P<0.001), and postoperative ventilatory care (P=0.001). Conclusion : Multiple factors cause synergistic effects on the development of acute renal failure after colorectal surgery. Therefore, efforts to reduce the risk factors associated with acute renal failure are needed. In addition, intensive postoperative care should be provided to all patients.
Lee, Deuk Yeon,Choi, Jae Hong,Shin, Jung Chul,Jung, Man Ki,Song, Seok Kyun,Suh, Jung Ki,Lee, Chang Young Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.443 No.-
<P><B>Abstract</B></P> <P>Compared with wet processes, dry functionalization using plasma is fast, scalable, solvent-free, and thus presents a promising approach for grafting functional groups to powdery nanomaterials. Previous approaches, however, had difficulties in maintaining an intimate sample-plasma contact and achieving uniform functionalization. Here, we demonstrate a plasma reactor equipped with a porous filter electrode that increases both homogeneity and degree of functionalization by capturing and circulating powdery carbon nanotubes (CNTs) via vacuum and gas blowing. Spectroscopic measurements verify that treatment with O<SUB>2</SUB>/air plasma generates oxygen-containing groups on the surface of CNTs, with the degree of functionalization readily controlled by varying the circulation number. Gas sensors fabricated using the plasma-treated CNTs confirm alteration of molecular adsorption on the surface of CNTs. A sequential treatment with NH<SUB>3</SUB> plasma following the oxidation pre-treatment results in the functionalization with nitrogen species of up to 3.2 wt%. Our approach requiring no organic solvents not only is cost-effective and environmentally friendly, but also serves as a versatile tool that applies to other powdery micro or nanoscale materials for controlled modification of their surfaces.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Our plasma reactor enables uniform functionalization of powdery nanomaterials. </LI> <LI> The reactor is equipped with a porous filter electrode and a gas-blower. </LI> <LI> The porous electrode captures powdery materials and functionalizes them by plasma. </LI> <LI> The sample can be repeatedly circulated via vacuum-filtration and gas-blowing. </LI> <LI> Sample circulation increases the degree and the homogeneity of functionalization. </LI> </UL> </P>
이송섭(Lee Song Seop),이왕제(Lee Wang Je),김득원(Kim Deuk Won),이경호(Lee Kyung Ho),김지현(Kim Ji Hyeon),신우철(Shin U Cheul) 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.1
Conventionally, solar thermal systems in South Korea have primarily focused on domestic hot water supply and partial space heating. However, with the recent expansion of applications to include industrial process heat and space heating in greenhouses with seasonal heat storage, there is an increasing requirement for developing highly efficient solar collectors that can operate effectively throughout the year. A solar thermal collector absorbs incoming solar radiation, converts it into thermal energy, and then transfers the energy to a heat-transfer fluid. The entire process should be optimized to minimize energy loss and ensure economic efficiency. A flat plate collector with single glazing is highly efficient at low temperatures and high solar intensities, whereas an evacuated tube collector is relatively efficient at high temperatures and low solar intensities. Therefore, in this study, we proposed a flat plate collector with double glazing that exhibited excellent thermal performance under all operating conditions. We validated the thermal performance through theoretical analysis and empirical experiments. In the theoretical analysis, we presented an analytical model for the comprehensive modeling of the flat plate collector and examined its thermal performance based on key design parameters, such as solar transmittance, emissivity, and gas fill. The thermal performance was confirmed, and an optimal design solution was derived. Furthermore, to validate the accuracy of our analysis, we conducted thermal performance testing on an optimized flat plate collector with double glazing, according to the specifications outlined in KS B 8295. The results showed a correlation between the simulation and experimental results.