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최규용,박중남,이재광,정한철,최광식,이철위 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
재생가능한 여러 종류의 불균일 촉매를 사용하여 batch형, fixed형 장치에서 과산화수소와 페놀을 반응시켜 수용액 하에서 카테콜과 하이드로퀴논을 합성하였다. Batch 형에서 사용한 촉매 중에서 Fe,Co-NaY를 사용하여 반응하였을 경우가 페놀의 전환율(21.8%), 하이드로퀴논 (23.4%), 카테콜(58.2%), By-product(17.0%)의 결과로 가장 우수하였으며, 최적화 조건은 페놀과 과산화수소의 몰비(3), 온도(60℃), 페놀과 촉매의 무게비(50), 용매와 촉매의 무게비(4.5)였다. Fixed 형에서도 Fe,Co-NaY촉매를 사용하였는데 결과로는 온도(70℃), 페놀과 과산화수소의 몰비(3), 용매와 촉매의 무게비(4.5), WHSV=4h-1였고, 페놀의 전환율(21.8%), 하이드로퀴논(16.5%), 카테콜(44.9%), By-product(26.1%)의 결과를 보였다.
Helicobacter pylori에 감염된 십이지장궤양과 만성 위염에서 장형화생 빈도와 혈중 Pepsinogen치의 비교
최규용,정인식,이강문,최명규,박두호,한석원,윤종구,이동수,김성수,김상우,양영상 대한소화기학회 2000 대한소화기학회지 Vol.36 No.2
Background/Aims: The aim of this study was to investigate the differences in the frequency of intestinal metaplasia, its subtypes, and serum pepsinogen levels between Helicobacter pylori (H. pylori)-infected patients with duodenal ulcer and patients with chronic gastritis. Methods: We evaluated the area of atrophic change, frequency of intestinal metaplasia and subtypes, serum pepsinogen (PG) levels, and seropositivity of CagA and VacA in 25 H. pylori-infected patients with duodenal ulcer and 25 patients with chronic gastritis. Results: Eight percent of patients with duodenal ulcer showed open type, whereas 52% of patients with chronic gastritis showed it (p=0.001). The intestinal metaplasia was less frequently observed in patients with duodenal ulcer (36% vs. 68%, p$lt;0.005). However, there was no difference in frequency of intestinal metaplasia subtypes between the two groups. The patients with duodenal ulcer showed significantly high serum PG I/II ratio (3.3±1.1 vs. 2.2±0.8, p$lt;0.001). There was no differen in the seropositivity of CagA and VacA between the two groups. Conclusions: H. pylori-infected patients with duodenal ulcer have the significantly smaller area of atrophic change and lower frequency of intestinal metaplasia than patients with chronic gastritis. Serum PG I/II ratio which is significantly high in patients with duodenal ulcer reflects the degree of the atrophic change of the gastric mucosa, but CagA and VacA do not.
최규용,정인식,이영석,김부성,최명규,한남익,최종영,한석원 대한소화기내시경학회 1994 Clinical Endoscopy Vol.14 No.3
Upper gastrointestinal tract angiodysplasia is rare, but it is an important cause of upper gastrointestinal bleeding. We experienced a case of hemorrhagic angiodysplasia of duodenal bulb in a patient under chronic hemodialysis due to chronic renal failure. Repeated upper GI endoscopy revealed an angiodysplasia at the posterior wall of the duodenal bulb. It was successfully treated by bipolar electrocoagulation. We report a case of angiodysplasia in chronic renal failure patient with the review of the literatures.
최규용,강성구,이광우,이만영,김희제,배시현,차상복,손호영,강무일,전승석 대한내분비학회 1991 Endocrinology and metabolism Vol.6 No.4
Rare cause of Cushing's syndrome, known as macronodular adrenocortical hyperplasia may be found sometimes with biochemical and radiological features mimicking adrenal adenoma. Cushing's syndrome due to nodular adrenal hyperplasia comprises a clinical and biochemically heterogeneous group of disorders whose pathogenesis is unclear. But, it has been suggested the concept of dual control with semiautonomy of the adrenal nodules and predominence of the pituitary at one time and of the adrenal at another. We describe a patient with atypical steroid dynamics and with a 1.8cm diameter unilateral adrenal nodule who had pituitary ACTH-dependent disease with impaired dexamethasone suppressibility. This case provides evidence suggesting that in some cases of Custhing's syndrome may begin first as a pituitary process which can evolve in time into one of autonomously functioning nodular adrenal hyperplasia. (J Kor Soc Endocrinol 6:353~361, 1991)
Toluene-4-sulfonic Acid 4-Allyl-2,6-dimethoxy-phenyl Ester
최규용,한병희,강성권,성창근,강상욱,서일환,Choi, Kyu-Yong,Han, Byung-Hee,Kang, Sung-Kwon,Sung, Chang-Keun,Kang, Sang-Ook,Suh, Il-Hwan Korean Crystallographic Association 2004 韓國結晶學會誌 Vol.15 No.1
上記 題目의 化合物, $C_{18}H_{20}O_5S$은 한 對非稱 單位內에 한 個의 分子를 가지고 對稱中心室間群 $P\={1}$로 結晶化 되었다. sulfonate 群內ml S 原子는 O와 C 原子들로 이루워진 四面體 環境을 維特하고 있으며, S-O 二重結合 平均 길이는 1.420(2) ${\AA}$이며 S-O 單一結合 길이는 1.598(2) ${\AA}$이고 S-C 結合 길이는 1.742(3) ${\AA}$이다. C(7)-S-O(3)-C(8) 의 비틀림 角은 100.3(2)$^{\circ}$이며, 두 個의 six-membered rings의 二面角은 42.73(20)$^{\circ}$이다. The title compound, $C_{18}H_{20}O_5S$, crystallized in the centrosymmetric space group $P\={1}$ with one molecule in an asymmetric unit. The S atom in the sulfonate group retains the overall tetrahedral environment of the O and C atoms with an average S-O bond of 1.420(2) ${\AA}$ for double bond and of 1.598(2) ${\AA}$ for single bond and S-C length of 1.742(3) ${\AA}$. The torsion angle C(7)-S-O(3)-C(8) is 100.3(2)$^{\circ}$ and the dihedral angle of the two planar six-membered rings is 42.73(20)$^{\circ}$.
내시경적 방법으로 교체된 Buried Bumper Syndrome 1예
최규용,김진일,정인식,김성수,김윤태,황인식,김혜원,선희식,이창돈,안창혁,한석원,채현석,장정원,방춘상 대한소화기내시경학회 2001 Clinical Endoscopy Vol.22 No.3
Percutaneous endoscopic gastrostomy (PEG) is used for nutritional support to the patients who cannot maintain the adequate oral intake. Compared with operative gastrostomy, PEG is a safe, rapid, and less expensive technique. Among several complications, buried bumper syndrome is a late complication in which internal bumper erodes into the gastric wall or migrates into the abdominal wall due to improper compression to the gastric wall. We here report a patient with peritubular leakage, resistance of tube feeding, and abdominal pain which were developed 13 months after percutaneous endoscopic gastrostomy. On endoscopic examination, the gastrostomy lumen could not be found. The gastrostomy tube was replaced successfully to new one with single procedure endoscopic technique. No complication was occurred and the function of tube has been well preserved.
최규용,김진일,이대훈,한석원,윤종구,송호진,성용직,오수혁,장우임,김병욱,박수헌,선희식 대한소화기학회 2001 대한소화기학회지 Vol.37 No.1
Metastatic cancer of the umbilicus is very rare and is called Sister Mary Joseph's nodule. The most common primary site of umbilical metastasis is an adenocarcinoma of the stomach and the incidence of pancreatic carcinoma is less than 10% of umbilical metastases. Metastasis to the umbilicus usually presents as diffuse spreading of primary cancer or recurrence after treatment of primary cancer, resulting in inoperability and poor prognosis. However, umbilical metastasis presents rarely as a first sign of primary cancer and leads to its diagnosis. We report a case of umbilical metastasis as a presenting sign of pancreatic adenocarcinoma. The patient was a 38-year-old woman who had a nodule in the umbilicus and suffered from abdominal pain around the umbilicus. Histologic findings of the umbilical nodule showed poorly differentiated adenocarcinoma. Abdominal computed tomography showed a pancreatic tail mass. Ultrasonography-guided aspiration biopsy of the pancreas also revealed poorly differentiated adenocarcinoma almost identical to the pathologic finding of the umbilicus.