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Park, Sunkyung,Lee, Jeong-Eun,Kang, Wonseok,Lee, Sang-Gak,Chun, Moo-Young,Kim, Kang-Min,Yuk, In-Soo,Lee, Jae-Joon,Mace, Gregory N.,Kim, Hwihyun,Kaplan, Kyle F.,Park, Chan,Sok Oh, Jae,Lee, Sungho,Jaffe American Astronomical Society 2018 The Astrophysical journal Supplement series Vol.238 No.2
<P>We present a library of high-resolution (R lambda/Delta lambda similar to 45,000) and high signal-to-noise ratio (S/N >= 200) near-infrared spectra for stars of a wide range of spectral types and luminosity classes. The spectra were obtained with the Immersion GRating INfrared Spectrograph covering the full range of the H (1.496-1.780 mu m) and K (2.080-2.460 mu m) atmospheric windows. The targets were primarily selected for being MK standard stars covering a wide range of effective temperatures and surface gravities, with metallicities close to the solar value. Currently, the library includes flux-calibrated and telluric-absorption-corrected spectra of 84 stars, with prospects for expansion to provide denser coverage of the parametric space. Throughout the H and K atmospheric windows, we identified spectral lines that are sensitive to T-eff or log g and defined corresponding spectral indices. We also provide their equivalent widths (EWs). For those indices, we derive empirical relations between the measured EWs and the stellar atmospheric parameters. Therefore, the derived empirical equations can be used to calculate the T-eff and log g of a star without requiring stellar atmospheric models.</P>
Current-carrying capacity of double-wall carbon nanotubes
Moon, Sunkyung,Song, Woon,Kim, Nam,Sung Lee, Joon,Na, Pil Sun,Lee, Soon-Gul,Park, Jongwan,Jung, Myung-Hwa,Lee, Hyun-Woo,Kang, Kicheon,Lee, Cheol Jin,Kim, Jinhee IOP Pub 2007 Nanotechnology Vol.18 No.23
<P>We have studied electrical transport characteristics of individual double-wall carbon nanotubes (DWNT) under high bias voltages. As the bias voltage applied to the carbon nanotubes increases, the outermost shell of the DWNTs broke down sequentially, which enabled us to determine the current-carrying capacity of each shell. The maximum current-carrying capacity per shell was about 150 µA, which is well above that of any other previous reports. </P>
음폐수의 하수슬러지 병합 처리를 위한 물리화학적 분석 및 혐기성소화 평가
이원배 ( Wonbae Lee ),이풀잎 ( Puleip Lee ),권준화 ( Junhwa Kwon ),이동진 ( Dongjin Lee ),이원석 ( Wonseok Lee ),신선경 ( Sunkyung Shin ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 추계학술발표논문집 Vol.2020 No.-
최근까지 음식물류폐기물 및 하수슬러지와 같은 유기성폐기물을 해양투기로 처리하였으나 런던협약 이후, 우리나라는 2012년부터 축산분뇨, 2013년부터는 음폐수의 해양배출이 금지되었고, 이에 따라 유기성폐기물을 전량 육상처리 하도록 하고 있다. 대표적인 고농도 유기성폐기물중 하나인 음식물류폐기물은 대부분 사료화 및 퇴비화 등으로 육상처리 되었으나, 아프리카돼지열병(ASF) 발생으로 인해 2019년부터 음식물류폐기물의 습식 사료화가 축소되었다. 이에 습식사료화로 처리되고 있던 음식물류폐기물이 건식사료화·퇴비화·중간가공 등으로 처리 물량이 증가함에 따라 급증하는 음폐수의 처리 방안이 필요한 실정이다. 음폐수의 처리 방법 중, 폐기물 안정화 및 발생하는 바이오가스를 에너지원으로 사용할 수 있는 혐기성 소화가 각광을 받고 있다. 하지만, 국내 음폐수의 경우, 혐기성 소화 시 낮은 pH 및 염분농도로 인해 혐기성 소화 효율이 저하될 수 있어 이를 극복하기 위한 방안으로 하수슬러지와 혼합하여 처리하는 병합 혐기성 소화 방법을 활용할 수 있다. 따라서, 본 연구에서는 음식물류폐기물의 습식사료화가 축소됨에 따른 처리시설별 변동 현황 및 처리량을 파악하였으며, 효율적인 병합 혐기성 소화를 위해 음폐수 및 하수슬러지의 물리화학적 분석을 실시하여 각 폐기물별 바이오가스 발생량 및 저해인자 영향을 평가하였다. 또한, 실증 하수처리장내 혐기소화 시설에 음폐수를 투입하여 혐기성 소화 효율을 평가하였다. ASF 발병 이후, 음식물류폐기물 처리 시설의 현장 및 유선 조사를 실시한 결과, 습식사료화 시설은 총 121 개소 감소하였다. 효율적인 병합 소화를 위한 각 폐기물의 물리화학적 분석을 실시한 결과, 바이오가스 발생량은 음폐수가 하수슬러지에 비해 약 19% 높았으나, 고농도로 존재 시 혐기성 소화에 저해를 줄 수 있는 NH<sub>4</sub><sup>+</sup>농도가 약 1.9배 높았다. 이에, 하수처리장내 음폐수 투입량을 증가시키면서 혐기성 소화를 실시한 결과, TS 및 VS 제거율은 각각 45.4, 61.1%로 음폐수 투입 전과 비교하여 비슷한 수준을 나타냈다. 따라서, 물리화학적 분석 및 실증 시설 운전을 통해 평가한 결과, 음폐수 및 하수슬러지의 병합 혐기성소화 시, 음폐수의 고농도 NH<sub>4</sub><sup>+</sup>와 같은 유해인자들로 인해 혐기성 소화 효율이 감소할 수 있지만, 적정 비율의 음폐수 투입을 통해 기존의 하수슬러지 혐기소화 시설에서 안정적인 병합 혐기성 소화를 실시할 수 있을 것으로 판단된다.
Lee, Byung Ho,Seo, Ho Won,Yi, Kyu Yang,Lee, Sunkyung,Lee, Sunghou,Yoo, Sung-eun Elsevier 2005 european journal of pharmacology Vol.511 No.2
<P><B>Abstract</B></P><P>The present study was performed to evaluate the cardioprotective effects of [5-(2-methoxy-5-chloro-5-phenyl)furan-2-ylcarbonyl]guanidine (KR-32570) on ischemia/reperfusion-induced mechanical and metabolic dysfunction in isolated rat hearts. In addition, the effects of KR-32570 on the Na<SUP>+</SUP>/H<SUP>+</SUP>-exchanger (NHE) and lipid peroxidation were also evaluated. KR-32570 strongly inhibited the recovery from acidosis induced by an NH<SUB>4</SUB>Cl prepulse in PS120 fibroblast cells expressing the human NHE-1 isoform (IC<SUB>50</SUB>: 0.05 and 1.16 μM for KR-32570 and cariporide, respectively). In isolated perfused rat hearts subjected to 30-min ischemia/30-min reperfusion, KR-32570 (1–10 μM) significantly and concentration dependently improved cardiac contractile function and severe contracture in conjunction with causing a marked reduction in lactate dehydrogenase release. Additionally, it (1–10 μM) significantly increased the content of ATP, creatine phosphate and glycogen as well as decreased the tissue lactate content in heart homogenates following ischemia and reperfusion. KR-32570 (1–10 μM) significantly decreased the concentration of 8-<I>iso</I>-prostaglandin F<SUB>2α</SUB>, a reliable marker for oxidant stress, in perfusates from rat hearts subjected to ischemia and reperfusion. In separate experiments, KR-32570 significantly lowered the concentration of malondialdehyde in rat liver homogenate and inhibited Cu<SUP>2+</SUP>-induced peroxidation of low-density lipoprotein. Taken together, these results suggest that KR-32570 possesses potent cardioprotective effects in perfused rat hearts, and its effects may be mediated by inhibition of NHE-1, preservation of high-energy phosphates, and inhibition of lipid peroxidation.</P>
Lee, Byung Ho,Yi, Kyu Yang,Lee, Sunkyung,Lee, Sunghou,Yoo, Sung-eun Elsevier 2005 european journal of pharmacology Vol.523 No.1
<P><B>Abstract</B></P><P>The present study was performed to evaluate the cardioprotective effects of [5-(2-methoxy-5-chloro-5-phenyl)furan-2-ylcarbonyl]guanidine (KR-32570) in rat and dog models of coronary artery occlusion and reperfusion. In addition, we sought to clarify the efficacy of KR-32570 on reperfusion-induced fatal ventricular arrhythmia. In anesthetized rats subjected to 45-min coronary occlusion and 90-min reperfusion, KR-32570 (i.v. bolus) dose-dependently reduced myocardial infarct size from 58.0% to 50.7%, 35.3%, 33.5% and 27.0% for 0.03, 0.1, 0.3 and 1.0 mg/kg, respectively (<I>P</I><0.05). In anesthetized beagle dogs that underwent 1.2-h occlusion followed by 3.0-h reperfusion, KR-32570 (3 mg/kg, i.v. bolus) markedly decreased infarct size from 28.9% in vehicle-treated group to 8.0% (<I>P</I><0.05), and reduced the reperfusion-induced release in creatine kinase isoenzyme MB, lactate dehydrogenase, Troponin-I and glutamic-oxaloacetic transaminase. KR-32570 dose-dependently decreased the incidence of premature ventricular contraction, ventricular tachycardia or ventricular fibrillation induced by ischemia and reperfusion in rats. Similar results were obtained in dogs with reperfusion-induced arrhythmia. In separate experiments to assess the effects of timing of treatment, KR-32570 given 10 min before or at reperfusion in rat models also significantly reduced the myocardial infarct size (40.9% and 46.1%, respectively) compared with vehicle-treated group. In all studies, KR-32570 caused no significant changes in any hemodynamic profiles. Taken together, these results indicate that KR-32570 significantly reduced the myocardial infarction and incidence of arrhythmias induced by ischemia and reperfusion in rats and dogs, without affecting hemodynamic profiles. Thus, it could be potentially useful in the prevention and treatment of myocardial injuries and lethal ventricular arrhythmias.</P>