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PEBAX/PVDF 복합막 제조 및 투과증발을 통한 에탄올/물 분리 연구
손민영,정예원,나해은,조세욱 한국막학회 2023 멤브레인 Vol.33 No.6
In this study, a PEBAX/PVDF composite membrane was fabricated, and its pervaporation performance wastested in an ethanol/water mixture. In addition, we attempted to improve the pervaporation performance of the compositemembrane by forming a ZIF-8 layer on the surface of the PVDF substrate. The thickness of selective layer was optimizedby comparing the pervaporation performance depending on the PEBAX thickness. A pervaporation test was performed onthe Ethanol/Water mixture. As a result, the composite membrane using PVDF substrate with ZIF-8 layer had a flux of 1.98kg/m2h and separation factor of 3.88, showing higher values of both permeation flux and selectivity than the compositemembrane using bare PVDF substrate. 본 연구는 PEBAX/PVDF 복합막을 제조하고 에탄올/물 혼합액에 대한 투과증발 성능을 평가하였다. 또한 PVDF지지체 표면에 ZIF-8 층을 형성하여 복합막의 투과증발 성능을 향상시키고자 하였고, PEBAX 선택층 두께에 따른 성능 비교를 통해 최적의 막을 선정하였다. 제작된 복합막을 물과 에탄올이 95/5 중량비로 혼합된 공급액에 대하여 투과증발 실험을수행하였다. 그 결과 ZIF-8 충이 형성된 PVDF 지지체를 사용한 복합막의 경우 플럭스 1.98 kg/m2h, 분리 계수 3.88로 일반PVDF 지지체를 사용한 복합막보다 투과량과 선택도가 모두 높은 값을 나타내었다.
손민영,고효헌,백준걸,김성식 대한산업공학회 2010 대한산업공학회 춘계학술대회논문집 Vol.2010 No.6
최근 불안정적인 고객수요가 나타나면서 보다 유동적인 재고관리의 도입이 절실해졌다. 본 연구는 불안정한 고객수요가 발생했을 때 전체 시스템에서 발생하는 총재고비용을 최소화 하는 적응형 간판 시스템을 제안한다. 제안된 시스템에서 불안정한 고객수요의 변화에 적응하기 위한 방법으로 행동보상학습을 사용하여 제어모수를 적응적으로 변화되도록 설계한다. 적응형 간판 시스템 안에서 수요의 시계열 데이터가 실시간 관찰되고, 각 단계의 적절한 간판의 수가 제어 모수에 의해 계산된다. 본 논문은 제안된 적응형 간판시스템의 성과를 살펴보고 이전 재고관리 모델과 시뮬레이션을 통해 비교분석할 것이다.
손민영 한국문화융합학회 2019 문화와 융합 Vol.41 No.5
This study utilizes image literacy, the OREO Map format, and similes to promote positive self-discovery in college writing education. First, learners explore images that can express themselves, which links self- analysis and acquaintance interviews to pictures. Second, students select representative images through an extraction technique that aids self- understanding because it helps the learner identify the qualities that best represent them. Third, based on the OREO Map format, they use similes to develop a representative description. The OREO Map is used to organize persuasive messages since positive self-discovery is accompanied by self-discipline and students use similes with dynamic qualities because positive self-discovery is an extension of self-exploration. Finally, learners connect all of these elements so that they can proceed with writing. As a result, the students developed positive self-imagery as they worked through the steps. Their writing evolved from self- centered to non-centralized language, and demonstrated a growth of consciousness. If we take the learner characteristics of the Zero-Text era into account, this study utilizes image literacy, and connects the OREO Map method and the capacity of the simile with self-discovery writing to secure diversity in the developmental writing system.
Eosinophilic Esophagitis with Angina Pectoris
손민영,김성은,박선자,박무인,문원,김재현,정경원,최길순,임성일 대한소화기학회 2020 대한소화기학회지 Vol.76 No.2
Eosinophilic esophagitis (EoE) is an immune or antigen-mediated chronic inflammatory esophageal disorder that is relatively rare in Asian countries. The main symptoms of EoE are dysphagia and food impaction. Although chest pain is a symptom of EoE, it is also a symptom of coronary heart disease. This paper reports a case of EoE with angina pectoris in a 45-year-old male who was referred to the authors’ hospital for chest pain. He was diagnosed with angina pectoris because of mild stenosis in the left coronary artery on coronary angiography. On the other hand, the symptoms did not improve with angina medication therapy. Therefore, he underwent a chest CT scan, which revealed esophageal thickening. Esophagogastroduodenoscopy was performed. His endoscopic findings showed linear furrows with edema, and >90 eosinophils existed per high-power field on the histology findings. He was diagnosed with EoE. Through additional examinations, he was also diagnosed with asthma. The patient was treated with a proton pump inhibitor and a fluticasone inhaler. His symptoms and abnormal endoscopic findings disappeared after eight weeks of treatment. This case shows that physicians should consider the possibility of the symptoms for EoE when unexplained chest pain persists.