[Obesity] Murine Sleeve Gastrectomy with vs. without Antrectomy: Comparison of Feasibility as an Experimental Model

Yeryung Kim,Suk Bae Moon 대한외과학회 2021 대한외과학회 학술대회 초록집 Vol.2021 No.11

Flash-induced reduced graphene oxide as a Sn anode host for high performance sodium ion batteries

Jeon, Yeryung,Han, Xiaogang,Fu, Kun,Dai, Jiaqi,Kim, Joo Hyun,Hu, Liangbing,Song, Taeseup,Paik, Ungyu The Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.47

<P>Sn is a promising anode material for sodium ion batteries due to its high capacity. However, the fast capacity fading caused by large volume changes limits the employment of Sn anodes. Graphene has been considered as a host for Sn anode materials to improve the cycle performance. However, graphene scaffold preparation with large free spaces is challenging due to the need for a sacrificial template and etching process. Here, we prepared a porous scaffold composed of both reduced graphene oxide and graphene<I>via</I>a camera flash reduction as the host for Sn. The camera flash induces the reduction of the graphene oxide and pores generated by the<I>c</I>-axis popping of the graphene. The mechanical strength of the scaffold is also achieved by adjusting the concentration of graphene which does not react with the flash light. The porosity and mechanical properties of the reduced graphene oxide-graphene scaffold could be controlled by flash irradiation conditions and the mixing ratio between the graphene oxide and graphene. The porous scaffold enables a uniform Sn loading and an improvement in the sodium ion battery performance due to a sufficient free space for accommodating the Sn volume change and mechanical stability.</P>

Suppression of CFTR-mediated Cl ^- Secretion of Airway Epithelium in Vitamin C-deficient Mice

Kim, Yeryung,Kim, Hyemin,Yoo, Hae-Young,Kang, Jae Seung,Kim, Sung Joon,Kim, Jin Kyoung,Cho, Hyun Sung The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.3

<P>Hyperoxic ventilation induces detrimental effects on the respiratory system, and ambient oxygen may be harmful unless compensated by physiological anti-oxidants, such as vitamin C. Here we investigate the changes in electrolyte transport of airway epithelium in mice exposed to normobaric hyperoxia and in gulonolacton oxidase knock-out (gulo[-/-]) mice without vitamin C (Vit-C) supplementation. Short-circuit current (I<SUB>sc</SUB>) of tracheal epithelium was measured using Ussing chamber technique. After confirming amiloride-sensitive Na<SUP>+</SUP> absorption (ΔI<SUB>sc,amil</SUB>), cAMP-dependent Cl<SUP>-</SUP> secretion (ΔI<SUB>sc,forsk</SUB>) was induced by forskolin. To evaluate Ca<SUP>2+</SUP>-dependent Cl<SUP>-</SUP> secretion, ATP was applied to the luminal side (ΔI<SUB>sc,ATP</SUB>). In mice exposed to 98% PO<SUB>2</SUB> for 36 hr, ΔI<SUB>sc,forsk</SUB> decreased, ΔI<SUB>sc,amil</SUB> and ΔI<SUB>sc,ATP</SUB> was not affected. In gulo(-/-) mice, both ΔI<SUB>sc,forsk</SUB> and ΔI<SUB>sc,ATP</SUB> decreased from three weeks after Vit-C deprivation, while both were unchanged with Vit-C supplementation. At the fourth week, tissue resistance and all electrolyte transport activities were decreased. An immunofluorescence study showed that the expression of cystic fibrosis conductance regulator (CFTR) was decreased in gulo(-/-) mice, whereas the expression of KCNQ1 K<SUP>+</SUP> channel was preserved. Taken together, the CFTR-mediated Cl<SUP>-</SUP> secretion of airway epithelium is susceptible to oxidative stress, which suggests that supplementation of the antioxidant might be beneficial for the maintenance of airway surface liquid.</P>

종말의 포착과 그 양식적 전환 : 셀린의 경우

김예령(KIM, Yeryung) 프랑스학회 2013 프랑스학연구 Vol.63 No.-

Le présent travail examine le sens et la fonction de “la pensée eschatologique” chez Céline. S’il la considère comme “lucide”, et donc la plus importante, c’est parce qu’elle constitue la seule chose qui permette à l’homme de révéler sa vérité, la mort, sans aucune vanité ni le moindre mensonge. Il s’agit d’une vision moraliste sur la nature humaine, mais aussi d’un regard démystificateur que l’écrivain jette sur le fondement de la civilisation bourgeoise, d’une auscultation de la situation de son siècle. Céline comprend la pensée eschatologique comme “raffinement” par excellence, c’est-à-dire sensibilité extrême captivant le mouvement d’un instinct — silencieux mais irrésistible au fond de l’homme, autrement dit la “fêlure” qui mène l’humanité à la mort. Ainsi, avec ses gestes figurant la fêlure, et contre l’optimisme trompeur affublé de tous les agréments et “coquetteries” de la vie, la pensée eschatologique réalise à travers ses images allégoriques un art essentiellement non conformiste. Résistance, elle crée dans ses désaccords décisifs avec le monde et dans ses efforts délibérément intempestifs. D’où ce qu’on peut appeler le style tardif de Céline (the“late style” d’après l’expression de E. Said), une “manière” paradoxale de survivre au temps et à la mort. L’idée (ou l’image/pensée) de la Fin atteint son paroxysme lorsqu’elle fait coïncider la vocation médicale, la guérison, avec la vocation artistique, la sublimation de la mort et la conquête du temps. Les voeux ultimes de l’écrivain médecin réclameront par-dessus tout cette assomption: adoucissement de la mort, transfiguration de l’instinct de mort des hommes, si méchant et agressif, en mort paisible, voire en promesse de la grande ouverture du Temps Vierge. De la critique à la clinique, de la fêlure à la dissémination du texte, et de l’évolution (cette temporalité bourgeoise) à “l’involution” (ce mouvement cosmique ou “mystique” de la création). La pensée eschatologique met ainsi le point final à sa grande recherche de lucidité et à sa pérégrination si prolongée pour cet au-delà lumière.

A Ge inverse opal with porous walls as an anode for lithium ion batteries

Song, Taeseup,Jeon, Yeryung,Samal, Monica,Han, Hyungkyu,Park, Hyunjung,Ha, Jaehwan,Yi, Dong Kee,Choi, Jae-Man,Chang, Hyuk,Choi, Young-Min,Paik, Ungyu The Royal Society of Chemistry 2012 ENERGY AND ENVIRONMENTAL SCIENCE Vol.5 No.10

<P>Germanium holds great potential as an anode material for lithium ion batteries due to its large theoretical energy density and excellent intrinsic properties related to its kinetics associated with lithium and electrons. However, the problem related to the tremendous volume change of Ge during cycling is the dominant obstacle for its practical use. The previous research has focused on the improvement in mechanics associated with lithium without consideration of the kinetics. In this study, we demonstrate that the configuration engineering of the Ge electrode enables the improvement in kinetics as well as favorable mechanics. Two types of Ge inverse opal structures with porous walls and dense walls were prepared using a confined convective assembly method and by adjusting Ge deposition parameters in a chemical vapor deposition system. The Ge inverse opal electrode with porous walls shows much improved electrochemical performances, especially cycle performance and rate capability, than the electrode with dense walls. These improvements are attributed to a large free surface, which offers a facile strain relaxation pathway and a large lithium flux from the electrolyte to the active material.</P> <P>Graphic Abstract</P><P>A Ge inverse opal with porous walls shows excellent electrochemical performances due to a large free surface, which offers a facile strain relaxation pathway and a large lithium flux from the electrolyte to the active material. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2ee22358a'> </P>

현대 기독교인의 정체성 이해와 기독교 신앙교육의 새로운 방향: 한국 기독교인의 신체 존중감(Body-esteem)을 중심으로

유지은(Jieun Yoo),전예령(Yeryung Cheon) 한국기독교교육정보학회 2020 기독교교육정보 Vol.0 No.64

4차 산업혁명을 맞이하고 있는 지금 인간의 신체 존중감을 중심으로 현대 기독교인의 정체성 이해에 대한 기독교 신앙교육을 살펴보기 위해 한국 기독교인의 신체 존중감에 영향을 주는 종교적 변인으로 종교 참여, 종교적 성향, 영적 안녕감을 선정하여 변인 간의 관계를 살펴보는데 본 연구의 목적이 있다. 경기지역의 A대학교와 S대학교에서 교양과 교직 수업을 수강하는 기독교 학생과 서울에 위치하고 있는 3개의 개신 교회 성도를 대상으로 자료를 수집하여 t 검정, 일원분산분석, 상관관계 분석, 위계적 다중회귀분석을 실시하였다. 인구통계학적 특성에 따른 변인들의 차이를 살펴본 후 신체 존중감에 영향을 주는 변인을 위계적 다중회귀분석을 통해 살펴본 결과, 실존적 안녕감과 주관적 종교 참여가 차례로 신체 존중감에 영향을 주는 변인으로 밝혀졌다. 이러한 연구결과를 토대로 한국 기독교인의 신체 존중감과 관련한 기독교 교육적 방안을 모색하였다. The purpose of this study is to examine the potential of Christian faith education focused on the human being’s body-esteem by investigating the relationship between religious variables(e.g., religious involvement, religious orientation, and spiritual well-being) and body-esteem. For this purpose, data was collected from the total of 429 Christian college students that took liberal art courses or teaching certificate classes from A University and S University in the Gyeonggi region and Korean Christian adults from 3 protestant churches located in Seoul. Collected data was analyzed by using T-test, one-way ANOVA, correlation analysis, hierarchical multiple regression analysis. Our findings showed that existential well-being in spiritual well-being and subjective religiosity in religious involvement were strong predictors of body-esteem, while other religious variables did not have significant effects on body-esteem. The implication, discussion, and limitation for this research are presented.

Si nanotubes array sheathed with SiN/SiOxNy layer as an anode material for lithium ion batteries

Song, Taeseup,Jeon, Yeryung,Paik, Ungyu Springer-Verlag 2014 JOURNAL OF ELECTROCERAMICS Vol.32 No.1

Airway Smooth Muscle Sensitivity to Methacholine in Precision-Cut Lung Slices (PCLS) from Ovalbumin-induced Asthmatic Mice

Kim, Hae Jin,Kim, Yeryung,Park, Su Jung,Bae, Boram,Kang, Hye-Ryun,Cho, Sang-Heon,Yoo, Hae Young,Nam, Joo Hyun,Kim, Woo Kyung,Kim, Sung Joon The Korean Society of Pharmacology 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.1

Asthma is a chronic inflammatory disease characterized by airway hyperresponsiveness (AHR) and reversible airway obstruction. Methacholine (MCh) is widely used in broncho-provocation test to evaluate airway resistance. For experimental investigation, ovalbumin-induced sensitization is frequently used in rodents (Ova-asthma). However, albeit the inflammatory histology and AHR in vivo, it remains unclear whether the MCh sensitivity of airway smooth muscle isolated from Ova-asthma is persistently changed. In this study, the contractions of airways in precision-cut lung slices (PCLS) from control, Ova-asthma, and IL-13 overexpressed transgenic mice (IL-13TG) were compared by analyzing the airway lumen space (AW). The airway resistance in vivo was measured using plethysmograph. AHR and increased inflammatory cells in BAL fluid were confirmed in Ova-asthma and IL-13TG mice. In the PCLS from all three groups, MCh concentration-dependent narrowing of airway lumen (${\Delta}AW$) was observed. In contrast to the AHR in vivo, the $EC_{50}$ of MCh for ${\Delta}AW$ from Ova-asthma and IL-13TG were not different from control, indicating unchanged sensitivity to MCh. Although the AW recovery upon MCh-washout showed sluggish tendency in Ova-asthma, the change was also statistically insignificant. Membrane depolarization-induced ${\Delta}AW$ by 60 mM $K^+$ (60K-contraction) was larger in IL-13TG than control, whereas 60K-contraction of Ova-asthma was unaffected. Furthermore, serotonin-induced ${\Delta}AW$ of Ova-asthma was smaller than control and IL-13TG. Taken together, the AHR in Ova-asthma and IL-13TG are not reflected in the contractility of isolated airways from PCLS. The AHR of the model animals seems to require intrinsic agonists or inflammatory microenvironment that is washable during tissue preparation.

Airway Smooth Muscle Sensitivity to Methacholine in Precision-Cut Lung Slices (PCLS) from Ovalbumin-induced Asthmatic Mice

Hae Jin Kim,Yeryung Kim,Su Jung Park,Boram Bae,Hye-Ryun Kang,Sang-Heon Cho,Hae Young Yoo,Joo Hyun Nam,Woo Kyung Kim,Sung Joon Kim 대한생리학회-대한약리학회 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.1

Asthma is a chronic inflammatory disease characterized by airway hyperresponsiveness (AHR) and reversible airway obstruction. Methacholine (MCh) is widely used in broncho-provocation test to evaluate airway resistance. For experimental investigation, ovalbumin-induced sensitization is fre-quently used in rodents (Ova-asthma). However, albeit the inflammatory histology and AHR in vivo, it remains unclear whether the MCh sensitivity of airway smooth muscle isolated from Ova-asthma is persistently changed. In this study, the contractions of airways in precision-cut lung slices (PCLS) from control, Ova-asthma, and IL-13 overexpressed transgenic mice (IL-13TG) were compared by analyzing the airway lumen space (AW). The airway resistance in vivo was measured using ple-thysmograph. AHR and increased inflammatory cells in BAL fluid were confirmed in Ova-asthma and IL-13TG mice. In the PCLS from all three groups, MCh concentration-dependent narrowing of airway lumen (∆AW) was observed. In contrast to the AHR in vivo, the EC50 of MCh for ∆AW from Ova-asthma and IL-13TG were not different from control, indicating unchanged sensitivity to MCh. Although the AW recovery upon MCh-washout showed sluggish tendency in Ova-asthma, the change was also statistically insignificant. Membrane depolarization-induced ∆AW by 60 mM K+ (60K-con-traction) was larger in IL-13TG than control, whereas 60K-contraction of Ova-asthma was unaffected. Furthermore, serotonin-induced ∆AW of Ova-asthma was smaller than control and IL-13TG. Taken together, the AHR in Ova-asthma and IL-13TG are not reflected in the contractility of isolated airways from PCLS. The AHR of the model animals seems to require intrinsic agonists or inflammatory microenvironment that is washable during tissue preparation.

Three dimensional-TiO₂ nanotube array photoanode architectures assembled on a thin hollow nanofibrous backbone and their performance in quantum dot-sensitized solar cells

Han, Hyungkyu,Sudhagar, P.,Song, Taeseup,Jeon, Yeryung,Mora-Seró,, Ivá,n,Fabregat-Santiago, Francisco,Bisquert, Juan,Kang, Yong Soo,Paik, Ungyu The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.27

<P>Facile synthesis of TiO<SUB>2</SUB> nanotube branched (length ∼0.5 μm) thin hollow-nanofibers is reported. The hierarchical three dimensional photoanodes (H-TiO<SUB>2</SUB>-NFs) (only ∼1 μm thick) demonstrate their excellent candidature as photoanodes in QD-sensitized solar cells, exhibiting ∼3-fold higher energy conversion efficiency (<I>η</I> = 2.8%, <I>J</I><SUB>sc</SUB> = 8.8 mA cm<SUP>−2</SUP>) than that of the directly grown nanotube arrays on a transparent conducting oxide (TCO) substrate (<I>η</I> = 0.9%, <I>J</I><SUB>sc</SUB> = 2.5 mA cm<SUP>−2</SUP>).</P> <P>Graphic Abstract</P><P>Facile synthesis of TiO<SUB>2</SUB> nanotube branched (length ∼0.5 μm) thin hollow-nanofibers is reported. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc40439k'> </P>