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기계적 분쇄방법을 통한 코팅용 알루미나 졸의 제조 및 평가
유정환,정승화,조범래,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Jo, Bum-Rae,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국재료학회 2008 한국재료학회지 Vol.18 No.8
$Al_2O_3$ sol with long-term stability was prepared by mechanical milling. Thin films were evaluated and created for use as coating materials. The particle size of the manufactured sol was 98 nm when 2 wt% of nitric acid was added. This indicates that the viscosity of the sol is 12 cps and that it has long-term stability. The thickness of the thin films, which varied from 100 nm to 500 nm, could be managed by adjusting the draw rate and the amount of an organic additive. A thin film heated to $500^{\circ}C$ indicated a hydrophilic property against water and excellent permeability against a visible ray.
BLU 및 형광체 코딩용 알루미나 분산액의 제조 및 평가
유정환,정승화,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
The suspension of $Al_2O_3$ which has long-term stability was made by mechanical milling. Thin films were evaluated and made to use as coating materials. A particle size of the suspension manufactured was 98 nm when 2 mt% nitric acid was added. It indicated that viscosity of the suspension is 12 cps and that it had the long-term stability. Thickness which was from 200 nm to 600 nm of the thin films was able to be made by adjusting draw rate and organic additive. Cracks of thin films at room temperature were prevented by adding Ethyl cellulose from 0.5 wt% to 2 wt%. The thin film heated at $500^{\circ}C$ indicated a hydrophilic property against water and an excellent permeability against a visible ray.
여천공단의 대기오염이 토양의 화학적 특성 , 지의류 , 탈질균 및 황산환원균에 미치는 영향
유정환(Jung Hwan Yu),가강현(Kang Hyun Ka),박현(Hyun Park) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.2
Air pollution effects on soil chemical properties, denitrifying and sulfur - reducing bacteria and lichens were examined around the Yeochun industrial estate. Soil samples were collected from mountain and/or mountain edges around the Namhae Chemical Corp., which is located at the southern edge of the estate, and sampled plots which were selected at 2㎞, 4㎞, 6㎞, 8㎞, and 10㎞ apart from the industrial estate. The forest soils around the industrial estate could be classified into the Reddish yellow forest soil group, but soil pH was quite lower than the soils of the group. Because of the extremely low soil pH, microbial activity related to mineralization of organic matter was expected to be very low even though C/N ratio ranged from 15 to 20. As a result, soil organic matter and total nitrogen in soil were relatively high compared to the soils of the group. In general, soil chemical properties around the industrial estate up to 4㎞ apart from the estate were significantly different from the rest(more than 6㎞ apart from the estate) possibly due to air pollution. However, denitrifying bacteria and sulfur - reducing bacteria did not show significant differences in colony forming units by the distances from the industrial estate. By the way, lichens showed distinct differences in frequencies and coverages by the distances from the industrial estate possibly due to air pollution. The corticolous lichens showed more sensitive response to the air pollution compared to the saxicolous lichens.
전신 항암 치료에 실패한 간암 폐전이 환자에서 수술과 방사선 치료로 완치한 1예
유정환 ( Jung Hwan Yu ),이정일 ( Jung Il Lee ) 대한간암학회 2017 대한간암학회지 Vol.17 No.1
In hepatocellular carcinoma (HCC), sorafenib is the only approved systemic chemotherapy, and has been applied for those with advanced HCC especially with systemic metastasis. However, the treatment results are suboptimal leaving many cases with disease progression despite the use of optimum dose. There is no established guideline for those that fail to respond to sorafenib treatment. In this case, a 46-years-old male with metastatic lung cancer from HCC experienced progression despite sorafenib treatment. Then, the patient received surgical resection of the metastatic lung mass followed by radiation therapy and achieved complete remission for 10 months after the surgical treatment and radiation therapy. Alpha-fetoprotein level was normalized and complete remission has been maintained. (J Liver Cancer 2017;17:77-81)
증례 : 소화기 ; 복강 내 종양으로 오인된 농양을 형성한 위궤양 천공 1예연세대학교 의과대학 강남세브란스병원 1소화기내과, 2영상의학과
유정환 ( Jung Hwan Yu ),장성일 ( Sung Ill Jang ),박정수 ( Jung Soo Park ),정교태 ( Kyo Tae Jung ),김주희 ( Joo Hee Kim ),김자경 ( Ja Kyung Kim ),이관식 ( Kwan Sik Lee ) 대한내과학회 2011 대한내과학회지 Vol.81 No.1
저자들은 복강 내 종양 의심 환자에서 위궤양 천공에 의한 복강 내 농양을 진단하고 약물치료만으로 완치된 예를 경험하여 이를 문헌고찰과 함께 보고하는 바이다. Gastric ulcer perforation usually results in panperitonitis, which requires surgical treatment. A peritoneal abscess also can occur with gastric ulcer perforation, but it is not a common complication of peptic ulcer disease. Here, we report a peritoneal abscess that mimicked a tumor and was caused by a gastric ulcer and provide a literature review. A 57-year-old woman was admitted to our hospital for evaluation of an abdominal mass found in another hospital, with no signs of infection. She underwent a left lobectomy of the liver due to choledocholithiasis. Abdominal computed tomography (CT) revealed a heterogeneous mass attached to the antrum of the stomach. At endoscopy, we confirmed that the gastric ulcer at the antrum of the stomach caused the abscess. After 4 weeks of antibiotics and proton pump inhibitor treatment, she was cured. In a patient with abdominal pain and a peritoneal abscess of unknown cause, the possibility of peptic ulcer perforation should be considered. (Korean J Med 2011;81:89-92)
과민성 장 증후군에서 소장세균과다증식의 예측을 위한 락툴로오스 호기검사의 유용성
박정수 ( Jung Soo Park ),유정환 ( Jung Hwan Yu ),임현철 ( Hyun Chul Lim ),김지현 ( Jie Hyun Kim ),윤영훈 ( Young Hoon Yoon ),박효진 ( Hyo Jin Park ),이상인 ( Sang In Lee ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.4
Background/Aims: Lactulose breath test (LBT) has been `used as a presumptive surrogate marker for small intestinal bacterial overgrowth (SIBO). However, recent reports suggest that abnormal LBT cannot discriminate patients with irritable bowel syndrome (IBS) from the control. Thus, the aim of this study was to evaluate the usefulness of LBT in IBS. Methods: LBT from 76 IBS patients, 70 functional bowel disorders (FBD), and 40 controls were examined. LBT was considered positive if (1) baseline breath hydrogen (H2) >20 parts per million (ppm) or rise of breath H2 >20 ppm above the baseline in <90 mins, or (2) baseline breath methane (CH4) > 10 ppm or rise of breath CH4 >10 ppm above the baseline in <90 mins. The subjects were categorized into predominant hydrogen producers (PHP), predominant methane producers (PMP), combined producer, and both negative group based on LBT. Results: The rate of abnormal LBT in the IBS, FBD, and control group were 44.7%, 41.4%, and 40.0% respectively without significant differences. The rate of PHP or PMP was not significantly different among the IBS, FBD, and control group. When clinical characteristics were analyzed in IBS and FBD according to LBT types, IBS subtypes and symptoms were not significantly different. Conclusions: LBT was not useful to discriminate IBS/FBD patients from the control. The assessment of SIBO by LBT in IBS should be revalidated in the future. (Korean J Gastroenterol 2010;56:242-248)
증례 : 소화기 ; 내시경적 보툴리눔 독소 주입으로 치료한 윤상인두근이상증 1예
정교태 ( Kyo Tae Jung ),최홍규 ( Hong Kyu Choi ),이기병 ( Ki Byung Lee ),유정환 ( Jung Hwan Yu ),김지현 ( Jie Hyun Kim ),박윤길 ( Yoon Ghil Park ),이상인 ( Sang In Lee ) 대한내과학회 2010 대한내과학회지 Vol.79 No.3
보툴리눔 독소는 아칼라지아, 당뇨병성 위마비, 오디괄약근 장애, 만성 항문치열 등 다양한 소화기 질환에 사용되고 있다. 윤상인두근 기능이상은 이전에는 기계적 풍선 확장술이나 윤상인두근 절제술로 치료하였으나, 최근 윤상인두근 내 보툴리눔 독소 주입에 의해 안전하고 효과적으로 치료될 수 있음이 보고되고 있다. 본 환자는 뇌졸중에 의한 윤상인 두근 장애로 연하곤란을 호소하였으며, 내시경적 보툴리눔 독소주입 이후 호전을 보였기에 이를 보고하는 바이다. Botulinum toxin has been used to treat various gastrointestinal tract diseases such as achalasia, diabetic gastroparesis, sphincter of oddi dysfunction, and chronic anal fissures. Recently, it has also been used for the treatment of cricopharyngeal muscle dysfunction. Several studies have reported that botulinum toxin injections may be a safe and effective treatment. Previously, cricopharyngeal muscle dysfunction was treated by mechanical balloon dilation or cricopharyngeal myotomy. Here, we report a case of a 57-year-old man who presented with cricopharyngeal dysphagia due to cerebral infarction and who was successfully treated with endoscopic botulinum toxin injection. (Korean J Med 79:301-305, 2010)