막 접촉기-탈거탑 복합 공정을 이용한 이산화탄소 분리회수

연순화,서봉국,박유인,이규호 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.6

중공사막 접촉기를 기존의 흡수장치에 흡수기로 도입하여 구축한 hybrid 시스템을 이용하여 이산화탄소의 분리·회수에 관한 연구를 수행하였다. 분리효율이 우수한 중공사막 접촉기를 개발하기 위해 다양한 구조적 특성을 가지는 PVDF, PTFE 및 PP 중공사막을 이용하여 혼합 기체 및 흡수제 유량 등의 운전조건에 따른 이산화탄소 제거효율 특성을 조사하였다. 그 결과 중공사막 접촉기가 기존의 충진 흡수탑에 비해 큰 기-액간의 접촉면적으로 인해 분리효율이 높았으며, 그 중에서도 PVDF 중공사 막이 안정된 기-액간의 계면을 유지함으로서 다른 중공사막에 비해 우수한 분리효율을 나타내었다. 또한, 흡수제의 종류(H_2O, K_2CO_3, MEA)에 따른 흡수성능을 조사하고, CO_2-MEA계에서 각 중공사막에 대한 물질전달 특성을 비교하였다. 이산화탄소 분리효율, 경제성, 물질전달 특성 등을 고려하면, MEA를 흡수제로 사용한 경우, PVDF 중공사막이 막 접촉기로서 가장 적합할 것으로 기대된다. Membrane contactor-stripper hybrid process was used to recover CO_2 from the flue gas. Porous PTFE, PVDF, PP hollow fiber modules were used as the membrane contactor. The CO_2 was removed by the porous polymeric hollow fiber membrane contactor using H_2O, K_2CO_3 or monoethanolamine(MEA) solution as the absorbent. Then, the CO_2 was recovered from the absorbent by the thermal stripping tower with steam. The membrane contactor increased the gas-liquid contactor area and mass transfer coefficient, and thus the hybrid process showed a higher CO_2 removal efficiency than the conventional absorption tower. PVDF module with smaller pore size showed the most stable gas-liquid interface and the highest removal efficiency among the hollow fiber membrane contactor modules. gas

데이터 글러브를 이용한 손 제스처 기반 3차원 게임 구현

유다연,권차욱,곽지민,백화현,김이조,차경애 대구대학교 정보통신연구소 2010 情報通信硏究 Vol.7 No.1

데이터 글러브(Data Glove)는 손 제스처를 정의하여 시스템을 제어하는 입력장치로 가상현실기술 및 교육, 의료, 산업분야에서 많이 사용되고 있다. 이는 가상현실 속에 존재하는 사물을 현실에서 제어하게 함으로써 사용자에게 마치 현실 세계의 사물을 제어하는 느낌을 주는 장점을 가지고 있다. 이에 본 논문에서는 이러한 데이터 글러브의 장점을 이용하여 3차원 게임에 적용시키는 방법을 제안한다. 먼저 데이터 글러브로 제스처를 정의하고, 트래커(Tracker)와 연동하여 시스템을 구현한다. 구현된 시스템을 실험하기 위해서 OpenGL로 인형 뽑기 게임을 구현하고 사용자가 데이터 글러브를 착용 후 정의된 제스처를 통해 게임을 제어하도록 한다. 본 논문에서 제안한 방법은 사용자들에게 좀 더 높은 몰입감을 제공하며, 향후 게임 산업 발전에도 많은 영향을 줄 것으로 기대한다.

Corrigenda & Errata : Gastric Emptying in Migraine: A Comparison With Functional Dyspepsia

( Yeon Hwa Yu ),( Yunju Jo ),( Jun Young Jung ),( Byung Kun Kim ),( Ju Won Seok ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.2

Gastric Emptying in Migraine: A Comparison With Functional Dyspepsia

( Yeon Hwa Yu ),( Yunju Jo ),( Jun Young Jung ),( Byung Kun Kim ),( Ju Won Seok ) 대한소화기기능성질환·운동학회 2012 Journal of Neurogastroenterology and Motility (JNM Vol.18 No.4

Background/Aims Gastric stasis in migraineurs remains controversial. The aim of this study is to investigate gastric emptying (GE) time, and any associations between GE parameters and dyspeptic symptoms among patients with functional dyspepsia (FD) and migraine without any gastrointestinal symptoms during the interictal period. Methods We enrolled 27 migraine patients, 32 FD patients and 12 healthy people as controls, and performed GE scintigraphy as gastric function test. Gastrointestinal symptoms were evaluated in the FD and migraine. Results The age-adjusted mean gastric half-emptying time in FD (125.51 ± 52.55 minutes) patients was longer than in migraineurs (100.82 ± 23.94 minutes, P = 0.035) and controls (95.25 ± 23.29 minutes, P = 0.021). The percentage of gastric retention was higher in FD than in migraine. However, migraineurs did not show an obvious delayed gastric emptying or an increase of gastric retention when compared to the normal controls. The association between each dyspeptic symptom and GE parameters was not significant, but postprandial fullness and early satiety showed a tendency of delayed GE. In migraineurs, GE time did not show significant association with nausea and vomiting during interictal periods. Conclusions Delayed GE does not appear to be a mechanism that patients with FD and migraine have in common. Migraineurs without dyspepsia during interictal period had normal GE, and further study for association with FD should be investigated. (J Neurogastroenterol Motil 2012,18:412-418)

삼킴곤란과 위식도 역류 증상을 가진 환자에서 호산구 식도염의 유병률

유연화 ( Yeon Hwa Yu ),조윤주 ( Yun Ju Jo ),정미연 ( Mi Yeon Jung ),손병관 ( Byoung Kwan Son ),전대원 ( Dae Won Jun ),김성환 ( Seong Hwan Kim ),박영숙 ( Young Sook Park ),이원미 ( Won Mi Lee ),김은경 ( Eun Kyoung Kim ) 대한소화기기능성질환·운동학회 2009 Journal of Neurogastroenterology and Motility (JNM Vol.15 No.1

목적: 성인에서의 호산구 식도염은 삼킴곤란과 음식 막힘, 치료가 잘되지 않는 위식도역류질환 환자에서는 반드시 고려해야 할 질환이다. 본 연구의 목적은 삼킴곤란과 위식도 역류질환과 관련된 증상에서 호산구 식도염의 빈도를 고찰하는 것이다. 대상 및 방법: 을지의과대학 을지병원에서 2007년 7월부터 2009년 2월까지 삼킴곤란, 음식 막힘, 양자펌프 억제제에 반응없는 위식도역류질환이 의심이 되는 환자를 대상으로 중부식도를 포함하여 조직 검사를 시행하였다. 결과: 연구에 포함된 환자는 108명이었으며, 호산구 식도염으로 진단받은 환자는 2명(1.8%)이었다. 그 외, 호산구 위장관염 2예, 약제 의인성 호산구 위장관염 1예가 있었다. 주된 증상은 삼킴곤란(37.9%), 상복부 통증(25.9%), 역류(23.1%) 순이었다. 대상 환자의 내시경 소견은 Z-line blurring (28.7%), 정상(17.5%), 발적(16.6%) 등 이었으나, 호산구 침착을 보이는 경우는 동심원 주름, 종축 방향의 골, 다수의 점막 결절 혹은 흰색 반점 등이 보였다. 조직 소견은 경한 만성 염증(33.3%), 상피 세포 증식(16.6%), 호산구 침착(3.7%) 등이었다. 결론: 국내에서 삼킴곤란과 역류 관련 식도 증상을 환자에서 호산구 식도염의 유병률은 1.8%였으며, 증상과 내시경 소견을 염두에 두고, 호산구 관련 위장 질환진단에 생검을 적극 활용하여야겠다. Background/Aims: In adult patients with dysphagia, food impaction and non-responsiveness to proton pump inhibitor, eosinophilic esophagitis (EoE) should be considered. We aimed to investigate the prevalence of EoE in Korean patients. Methods: From July 2007-February 2009, 108 patients presenting with dysphagia and reflux related symptoms were enrolled. The mid-esophageal region was randomly biopsied. Results: Of the 108 patients, two cases of EoE, two cases of eosinophilic enterocolitis and one case of drug-induced eosinophilic enterocolitis were diagnosed. The most frequent symptom was dysphagia (37.9%), followed by epigastric pain (25.9%) and regurgitation (23.1%). Endoscopic findings of eosinophilic infiltration in the esophagus were ring esophagus, linear furrow, nodularities and whitish patches. Histologic findings showed chronic inflammation (33.3%), epithelial cell hyperplasia (16.6%), eosinophilic infiltration (3.7%) and a few eosinophil infiltration (1.8%). Conclusions: EoE was detected in 1.8% in Korean patients with dysphagia and reflux related symptoms. Esophageal random biopsy should be considered especially in young patients with a history of allergic disease and esophageal symptoms. (Kor J Neurogastroenterol Motil 2009;15:15-22)

증례 : 알코올 지방간 환자에서 폭음 후 발생한 타액선증 1예

유연화 ( Yeon Hwa Yu ),박영숙 ( Young Sook Park ),김성환 ( Seong Hwan Kim ),손병관 ( Byoung Kwan Son ),전대원 ( Dae Won Jun ),조윤주 ( Yun Ju Jo ),류용석 ( Yong Suk Ryu ),김현숙 ( Hyeon Suk Kim ) 대한소화기학회 2009 대한소화기학회지 Vol.54 No.1

Sialadenosis is a unique form of non-inflammatory, non-neoplastic bilateral salivary gland disorder characterized by recurrent painless swelling which usually occurs in parotid glands. Alcoholism is one of the main causes of sialadenosis along with diabetes, bulimia, and other idiopathic causes. The prognosis is verified according to the degree of liver function. We present a case of a 46 year-old man who had alcoholic fatty liver disease diagnosed as alcoholic sialadenosis based on clinical points of recurrent bilateral parotid swelling after heavy alcohol drinking, computed tomography, and fine-needle aspiration biopsy. After stopping alcohol drinking and treated with conservative treatment, he got improved without specific sequela. (Korean J Gastroenterol 2009;54:50-54)

문관나무 종자유의 이화학적 특성 분석

박유화(Yu Hwa Park),이기연(Ki Yeon Lee),홍수영(Soo Young Hong),김희연(Hee Yeon Kim),허남기(Nam Ki Heo),김경희(Kyung Hee Kim) 한국식품영양과학회 2012 한국식품영양과학회지 Vol.41 No.12

본 연구는 문관나무 종자유로부터 새로운 유지자원으로의 활용 가능성을 평가하기 위하여 여러 가지 이화학적 특성 분석을 하였다. 문관나무 종자유를 초임계 추출(420 atm, 50℃), 헥산 추출, 가열압착(160℃, 180℃) 방법으로 추출하였다. 그 결과 추출 수율은 헥산 추출이 53.5±2.5%로 가장 높았으며, 다음으로 160℃ 가열압착 추출이 48.3±6.5%, 180℃ 가열압착 추출과 초임계 추출은 각각 44.7±1.7%, 44.7±2.5%의 수율을 보였다. 산가를 측정한 결과, 초임계 추출 종자유가 3.44 mg/g으로 가장 높았으며 가열압착 추출 종자유가 1.3 mg/g 정도로 가장 낮았다. 문관과 종자유의 과산화물가를 측정한 결과, 가열압착 추출 종자유(160℃)가 3.10meq/kg으로 가장 높았으며 다음으로 가열압착 추출 종자유(180℃)가 2.36 meq/kg, 헥산 추출 종자유와 초임계 추출 종자유가 각각 1.59, 1.13 meq/kg 순으로 나타났다. 문관나무의 종자유로부터 지방산 조성을 분석한 결과 oleic acid(C18:1)와 linoleic acid(C18:2)가 60% 이상 함유되어 있었다. 또한 문관나무 종자유의 총 phytosterol 실험 결과 가열압착 추출 종자유(160℃)의 함량이 65.91±0.62 mg/100 g으로 가장 높았다. 본 연구는 문관나무 종자유의 추출방법별 이화학적 특성 분석을 통해 문관나무 종자유 활용에 대한 기초자료로 활용될 수 있을 것으로 판단된다. This study investigated the physiochemical characteristics of Xanthoceras sorbifolia seed oil. Xanthoceras sorbifolia seed oil was extracted by supercritical fluid extraction (420 atm, 50℃), hexane extraction and heatpressed extraction (160℃, 180℃). Acid values and peroxide values were evaluated, as well as the degree of lipid oxidation. The heat-pressed (160℃) extraction gave a 53.5±2.5% higher yield of oil, compared with the other extraction methods. The acid values from the super critical fluid extraction were the highest, while peroxide values were highest from the heat-pressed extraction at 160℃ (3.10 meq/kg). The contents of linolenic acid and oleic acid were 38.63~41.13% and 26.29~26.85%, respectively. Contents of stigmasterol and β-sitosterol were 6.01~6.49 mg/100 g and 58.19~59.85 mg/100 g, respectively. These results indicate that Xanthoceras sorbifolia seed oil can possibly serve as new edible oils.

복강내 거대 농양으로 발현한 산발 유건종 1예

유연화 ( Yeon Hwa Yu ),손병관 ( Byoung Kwan Son ),전대원 ( Dae Won Jun ),김성환 ( Seong Hwan Kim ),조윤주 ( Yun Ju Jo ),박영숙 ( Young Sook Park ),홍부환 ( Boo Whan Hong ),주종은 ( Jong Eun Joo ) 대한소화기학회 2009 대한소화기학회지 Vol.53 No.5

Desmoid tumor is a rare benign tumor derived from fibrous sheath or musculoaponeurotic structure. The tumor is benign histologically but considered as malignant clinically because it has high propensity on infiltrative growth with local invasion and tendency to recurrence after local excision. Especially, when this tumor happens to be in the intra-abdomen, the prognosis is worse because it can cause intestinal obstruction, ureter obstruction and, fistula formation. It also can invade major vessels in abdomen. This tumor occurs more frequently in patients with familial adenomatous polyposis (FAP), in post-partume women, and at old surgical incision site. However, in this case, the patient had neither previous surgery nor a FAP history. We report a rare case of the young male patient who presented with an acute abdomen and underwent laparotomy and was found to have an intra-abdominal desmoid tumor with abscess formation. (Korean J Gastroenterol 2009;53:315-319)

Identification of time-dependent biomarkers by EndoTox Array in cells exposed to nonylphenol

Yu Ri An,So-Yeon Yu,Seung Jun Kim,Jung-Mi Ha,Jong-Phil Youn,Jun-Sub Kim,Moon-Ju Oh,Jung-Hwa Oh,류재천,Seok Joo Yoon,Jaehoon Jo,황승용 대한독성 유전단백체 학회 2011 Molecular & cellular toxicology Vol.7 No.4

Nonylphenol (NP) is considered an endocrine disruptor due to its weak ability to mimic estrogen and in turn disrupt the natural balance of hormones in affected organisms. NP is reported to cause negative health effects in humans, such as hormone abnormalities and inhibition of growth and reproduction. In the present study, we developed a molecular tool for the evaluation of endocrine toxicity in mouse. To identify gene regulation effects of NP, we estimated gene expression in mouse Sertoli (TM4) and germ cell (GC)lines after exposure to NP. We measured the IC30 value of NP, then exposed the cells to that concentration for 3 hr and 24 hr and used EndoTox Array. The EndoTox Array was manufactured to monitor the endotoxicity of environmental chemicals. This array contains 1306genes that are influenced in reproductive toxicity or by EDCs. In the expression pattern analysis, 28 genes related to the reproductive process, cell proliferation,and nervous system development were progressively changed over time in NP-exposed cells. The study of gene interaction will increase our understanding of the time-dependent molecular mechanisms of NP.

Analysis of toxicity of tetrabutyltin: comparing with EDC chemicals

Yu Ri An,Seung Jun Kim,Hye-Won Park,So Yeon Yu,Jeong Han,Jung-Hwa Oh,Seok Joo Yoon,황승용 대한독성 유전단백체 학회 2011 Molecular & cellular toxicology Vol.7 No.1

Exposure to environmental chemicals has been implicated in a number of adverse health effects,including immunotoxic, neurotoxic, reproductive toxic effects, and, above all, cancers. In the present study,we investigated toxicity of three environmental chemicals-bisphenol A (BPA), nonylphenol (NP), and tetrabutyltin (TTBT) in a human breast cancer cell line by HazChem Human array. We then found toxicity markers of TTBT through comparison with BPA and NP. Fifty three genes were differentially expressed and seventeen genes showed similar expression patterns. Ontology analysis showed differential expression of genes related to aging and apoptosis and genes having similarities associated with pregnancy and insemination. In this paper, we revealed potential TTBT toxic markers and endotoxicity of TTBT. This study could be a foundation for additional studies of TTBT toxicity.