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Phase‐contrast hard X‐ray microscopy using synchrotron radiation for the diagnosis of onychomycosis
Lee, Onseok,Ha, Seunghan,Lee, Gunwoo,Kim, Jaeyoung,Huang, Jungyun,Jin, Kyeongsik,Oh, Chilhwan Wiley Subscription Services, Inc., A Wiley Company 2010 Microscopy research and technique Vol.73 No.12
<P><B>Abstract</B></P><P>Onychomycosis, or fungal infection of the nail, is a disease seen frequently in clinical settings. However, the rates of positive identification using potassium hydroxide preparations or fungal cultures are relatively low. Precise diagnosis is possible via histopathologic examination to monitor the existence of fungus and performance of a fungal culture for confirmation. Phase‐contrast hard X‐ray microscopy using synchrotron radiation provides 70‐nm spatial resolution and enables imaging of minute internal cellular structures. This study confirms the feasibility of diagnosing onychomycosis using a phase‐contrast hard X‐ray microscope developed at 1B2 beam line using a Pohang light source. Microsc. Res. Tech. 73:1110–1114, 2010. © 2010 Wiley‐Liss, Inc.</P>
The Effectiveness of Ferritin as a Contrast Agent for Cell Tracking MRI in Mouse Cancer Models
Lee, Chan Wha,Choi, Sun Il,Lee, Sang Jin,Oh, Young Taek,Park, Gunwoo,Park, Na Yeon,Yoon, Kyoung-Ah,Kim, Sunshin,Kim, Daehong,Kim, Yun-Hee,Suh, Jin-Suck Yonsei University College of Medicine 2017 Yonsei medical journal Vol.48 No.5
<P><B>Purpose</B></P><P>We aimed to investigate the effectiveness of ferritin as a contrast agent and a potential reporter gene for tracking tumor cells or macrophages in mouse cancer models.</P><P><B>Materials and Methods</B></P><P>Adenoviral human ferritin heavy chain (Ad-hFTH) was administrated to orthotopic glioma models and subcutaneous colon cancer mouse models using U87MG and HCT116 cells, respectively. Brain MR images were acquired before and daily for up to 6 days after the intracranial injection of Ad-hFTH. In the HCT116 tumor model, MR examinations were performed before and at 6, 24, and 48 h after intratumoral injection of Ad-hFTH, as well as before and every two days after intravenous injection of ferritin-labeled macrophages. The contrast effect of ferritin <I>in vitro</I> was measured by MR imaging of cell pellets. MRI examinations using a 7T MR scanner comprised a T1-weighted (T1w) spin-echo sequence, T2-weighted (T2w) relaxation enhancement sequence, and T2*-weighted (T2*w) fast low angle shot sequence.</P><P><B>Results</B></P><P>Cell pellet imaging of Ad-hFTH <I>in vitro</I> showed a strong negatively enhanced contrast in T2w and T2*w images, presenting with darker signal intensity in high concentrations of Fe. T2w images of glioma and subcutaneous HCT116 tumor models showed a dark signal intensity around or within the Ad-hFTH tumor, which was distinct with time and apparent in T2*w images. After injection of ferritin-labeled macrophages, negative contrast enhancement was identified within the tumor.</P><P><B>Conclusion</B></P><P>Ferritin could be a good candidate as an endogenous MR contrast agent and a potential reporter gene that is capable of maintaining cell labeling stability and cellular safety.</P>
Lee, Seokjae,Koo, Jaryong,Hyung, Gunwoo,Lim, Donghwan,Lee, Donghyung,Lee, Kumhee,Yoon, Seungsoo,Kim, Wooyoung,Kim, Youngkwan Springer 2012 Nanoscale research letters Vol.7 No.1
<P>We investigate multiple quantum well [MQW] structures with charge control layers [CCLs] to produce highly efficient blue phosphorescent organic light-emitting diodes [PHOLEDs]. Four types of devices from one to four quantum wells are fabricated following the number of CCLs which are mixed p- and n-type materials, maintaining the thickness of the emitting layer [EML]. Remarkably, such PHOLED with an optimized triplet MQW structure achieves maximum luminous and external quantum efficiency values of 19.95 cd/A and 10.05%, respectively. We attribute this improvement to the efficient triplet exciton confinement effect and the suppression of triplet-triplet annihilation which occurs within each EML. It also shows a reduction in the turn-on voltage from 3.5 V (reference device) to 2.5 V by the bipolar property of the CCLs.</P>
Lee, Namgue,Lee, Gunwoo,Choi, Hyeongsu,Park, Hyunwoo,Choi, Yeonsik,Kim, Keunsik,Choi, Yeongtae,Kim, Jong-Woo,Yuk, Hyunwoo,Sul, Onejae,Lee, Seung-Beck,Jeon, Hyeongtag Elsevier BV * North-Holland 2019 Applied Surface Science Vol.496 No.-
<P><B>Abstract</B></P> <P>In this report, two types of substrates were prepared for deposition of few-layer tin disulfide (SnS<SUB>2</SUB>) via atomic layer deposition (ALD). The first substrate was prepared using a conventional cleaning method, while the second substrate was rinsed with buffered oxide etcher (BOE) solution after conventional cleaning. Changes in the substrate were confirmed by X-ray photoelectron spectroscopy, contact angle measurements, and electron spin resonance. Characteristics of the SnS<SUB>2</SUB> thin films were determined by X-ray diffraction, Raman analysis, Fourier transform-infrared spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. To investigate growth rate, thickness was measured as a function of ALD cycle number by atomic force microscopy, and 2D layered structure was confirmed by transmission electron microscopy. Findings confirmed that surface treatment using BOE solution was related to an increased growth rate during the initial ALD process. Finally, back-gate field effect transistors based on ALD-grown SnS<SUB>2</SUB> film prepared on substrate that received diluted-BOE surface treatment showed marginal improvement in current on/off ratio from 2.9 × 10<SUP>5</SUP> to 6.5 × 10<SUP>5</SUP> and mobility from 0.22 cm<SUP>2</SUP>/Vs to 0.31 cm<SUP>2</SUP>/Vs compared to ALD-grown SnS<SUB>2</SUB> film prepared on bare substrate.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SnS<SUB>2</SUB> thin films were grown by atomic layer deposition. </LI> <LI> Bare and surface treated substrates were used to deposit SnS<SUB>2</SUB>. </LI> <LI> Buffered oxide etchant solution was used to surface treatment. </LI> <LI> Hydrophilicity of two different substrates was investigated. </LI> <LI> Growth rate and transport properties of SnS<SUB>2</SUB> thin films were investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Widely tunable double-ring resonator add/drop reflection filter based on polymer PLC
Lee, Ho,Lee, Youngsik,Kim, Gunwoo,Kim, Suhyun,Chung, Youngchul Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.4
<P>We demonstrate a widely tunable polymer add/drop reflection filter using double-ring resonators with slightly different radii. The reflector proposed as an alternative to grating-based wavelength-selective reflectors shows a wide tuning range of 42.3 nm using a small amount of current as small as 30 mA. If the proposed reflection filter is hybrid-integrated with a reflective semiconductor optical amplifier or a superluminescent laser diode, a low-cost widely tunable laser could be realized. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:852–855, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25048</P>
이건우(Lee, Gunwoo) 한국사회경제학회 2021 사회경제평론 Vol.34 No.1
본 논문은 스라파의 생산가격 체계를 화폐적 경제의 틀로 이해할 수 있는 하나의 이론적 가능성을 표권주의에 입각하여 모색한다. 이 논의 과정은 두 이론이 통합적으로 고려될 때에 비로소 두 이론 각각에 내재한 불충분한 점들이 서로 보완되고 더 나아가 극복될 수 있을 것이라는 가능성에 기초하여 전개된다. 이와 같은 문제의식에 기반하여, 본 논문은 우선 스라파의 가격이론의 기본적인 내용과 주요한 특징을 다룬 다음, 스라파의 이론에 화폐를 도입하려 했던 선행연구를 검토하는 차원에서 호지슨(Hodgson, 1981)과 피베티(Pivetti, 1985)의 연구를 소개한다. 그 후 각각의 시도가 가지는 이론적 한계를 비판하는 가운데, 우리는 피베티가 자신의 논의의 출발점으로 삼았던 틀 안에 표권주의적 관점의 전제를 도입하는 새로운 대안을 제시하고자 한다. 그 후 이러한 대안적 시도의 이론적 함의와 실증적 분석으로의 확장 가능성 등을 논하며 글을 맺는다. This paper tries to find a theoretical possibility to understand the Sraffian price system in terms of monetary economy. It is based on the idea that the integration of chartalism into the Sraffian system could provide both theories respectively with an abundant outcome. Keeping this idea in mind, we firstly introduce the basic contents and theoretic character of Sraffian system. And this paper presents several trials(Hodgson, 1981; Pivetti, 1985) of introduction of money into the Sraffian system as a literature review, with consideration of some their weak points as well. Lastly, we propose an alternative way to integrate money into the Sraffian system with chartalism idea within the Pivetti system and try to explicate its theoretic advantages and emphasize its empirical applicability.