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Reversibility of Endoscopic Features after Treatment for Eosinophilic Esophagitis
윤홍진,윤영훈,박준철,박효진 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.6
Purpose: The prevalence and incidence of eosinophilic esophagitis (EoE) are increasing worldwide. Despite increased understandingof inflammatory pathogenesis, changes in endoscopic features after treatment of EoE have not been clearly described. We aimed to investigate the reversibility of endoscopic features of EoE after treatment. Materials and Methods: Out of 58 adult subjects who were diagnosed with EoE at the Yonsei University Health System from July2006 to August 2019, we recruited 33 subjects (30 males; mean age: 42 years) whose pre-treatment and post-treatment endoscopicimages were available. Endoscopic features included both inflammatory and fibrostenotic features. Exudate, edema, furrow,and crepe paper-like mucosa were classified as inflammatory features. Ring and stricture were classified as fibrostenotic features. We compared changes in endoscopic features after treatment for EoE. Results: After treatment, clinical symptoms improved in all patients. The following endoscopic features were observed beforetreatment: furrow (81.8%), edema (90.9%), exudate (42.4%), ring (27.3%), crepe paper-like mucosa (15.2%), and stricture (3.0%). Endoscopic remission was achieved in 21 patients (63.6%). Inflammatory features were reversible (72.7%, p<0.001), whereas fibrostenoticfeatures were not (10%, p=0.160). Exudate had resolved in 92.9% of patients, edema in 70% and furrow in 88.9%. Ring andstricture persisted in almost all of the patients (9/10) who had these endoscopic features before treatment. Conclusion: We outlined the reversibility of endoscopic inflammatory features of EoE. Fibrostenotic features were irreversible afteresophageal remodeling in patients with EoE. However, further validation studies with long-term follow-up are needed.
공중합 아라미드 나노 섬유 표면처리에 의한 고무/공중합 아라미드의계면 안정성 연구
윤홍진,오동기,조장훈,이종대 한국고분자학회 2024 폴리머 Vol.48 No.2
공중합 아라미드 섬유는 인장강도 및 내구성이 우수한 특성이 있지만 고무와의 접착성능이 매우 낮은 단점이있으며 이러한 단점은 제품 고장의 원인이 되기도 한다. 공중합 아라미드 섬유를 mechanical rubber goods(MRG)등에 적용하기 위해서는 섬유표면을 처리하여 고무와의 계면에서 접착성 등을 향상시키는 것이 필요하다. 본 연구에서는 공중합 아라미드 표면의 화학적 개질 및 나노 크기의 아라미드 섬유를 표면에 코팅하여 고무와의 접착성을향상시켰다. Aramide nano fiber(ANF) 용액을 제조 및 침지공정을 통해 공중합 아라미드 원사에 코팅하였으며 침지시간에 따른 고무와의 계면접착성능을 확인하였다. ANF 용액에 10분간 침지하였을 때 침지 전 대비 인장강도는15.4%, 접착강도는 77.7% 증가하였다. 단시간동안 ANF 용액에 침지하였음에도 인장강도 및 접착강도가 우수한 특성을 나타내는 것을 확인하였다. Although copolymerized aramid fibers have superior tensile strength and durability, they have the disadvantage of very low adhesion performance with rubber, and these disadvantages may cause to product failure. Therefore, in order to apply aramid fibers to mechanical rubber goods (MRG), etc., it is necessary to improve the interface adhesion through the treating of fiber surface. This study improved adhesion to rubber by chemically modifying the surface of copolymerized aramid and coating nano-sized aramid fibers on the surface. An aramid nano fiber (ANF) solution was coated on a copolymerized aramid yarn through a preparation and immersion process, and the interfacial adhesion performance with rubber was confirmed according to the immersion time. When immersed in an ANF solution for 10 minutes, the tensile strength and adhesion strength increased by 15.4% and 77.7%. It was confirmed that the tensile strength and adhesion strength were superior even when immersed in the ANF solution for a short time.
尹弘鎭 고려대학교 의과대학 1977 고려대 의대 잡지 Vol.14 No.1
In this report, clinical studies of the gastric secretion by tetragastrin test were observed on 15 cases of chronic aggressive hepatitis and 22 cases of postnecroric cirrhosis. The pattern of gastric secretion was classified as basal acid output(BAO), maximal acid output(MAO), peak acid output(PAO) and secretion volume rate(SVR). The results were summarized as followe: The mean values of BAO, MAO, and SVR in the cases of chronic aggressive hepatitis and postnecrotic cirrhosis were lower than that of control cases. However, the mean values of BAO, MAO and SVR in the cases of postnecrotic cirrhosis were lower than that of chronic aggressive hepatitis.
금속산화물 전극을 사용한 고 에너지밀도 하이브리드 커패시터 특성
윤홍진 ( Hong Jin Yoon ),신윤성 ( Yoon Sung Shin ),이종대 ( Jong Dae Lee ) 한국유화학회 2011 한국응용과학기술학회지 Vol.28 No.3
The electrochemical performances of an asymmetric hybrid capacitor were investigated using LiFePO4 as the positive electrode and active carbon fibers(ACF) as the negative electrode. The electrochemical behaviors of a nonaqueous hybrid capacitor were characterized by constant current charge/discharge test. The specific capacitance using LiFePO4/ACF electrode turned out to be 0.87 F/cm2 and the unit cell showed excellent cycling performance. This hybrid capacitor was able to deliver a specific energy as high as 178 Wh/kg at a specific power of 1,068 W/kg.