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유지만(Jee Man You),이정균(Jeung Kyun Lee),박원철(Won Cheul Park),강동백(Dong Baek Kang),윤성언(Sung eun Yoon),윤기중(Ki Jung Yoon) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.2
Purpose: This study was performed to evaluate the contribution of appendiceal computed tomography (CT) in the more accurate diagnosis of acute appendicitis and decrease in the rate of negative appendectomies. Methods: Between May and August 2005, 146 patients with right lower quadrant (RLQ) abdominal pain and tenderness were diagnosed using appendiceal CT. The appendiceal CT scans were performed with contrast media in the abdominal and pelvic areas. 7 ㎜ slice scans were taken both before and after the contrast media injection, with a time delay. The control group was comprised of 99 patients, who were also checked by abdominal CT or ultrasonography, between December 2004 and April 2005, with the data analyzed retrospectively. Results: In the study group, 85 of the 146 cases were diagnosed with acute appendicitis on appendiceal CT, and had undergone an appendectomy, including 42 men (mean age 39.9 yr) and 43 women (mean age 44.6 yr). The sensitivity and specificity of appendiceal CT in acute appendicitis were 95.3 and 98.4%, respectively. There were 4 (4.7%) negative appendectomy cases; 2 in men and 2 in women. The control group conprised of 47 men and 52 women. There were 13 (13.1%) negative appendectomy cases; 4 in men and 9 in women. Conclusion: The routine use of appendiceal CT, in patients with RLQ abdominal pain and tenderness, resulted in a significant decrease in the negative appendectomy rate.
강동백(Dong Baek Kang),김승호(Seung Ho Kim),오정택(Jung Taek Oh),박원철(Won Cheul Park),이정균(Jeung Kyun Lee),김헌수(Hun Soo Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.2
Schwannoma is a common soft tissue tumor, but it appears to be rare among the spindle cell mesencymal tumors of the gastrointestinal tract. Gastrointestinal Schwannomas (GIS) are rare and most of them originate in the stomach or the small bowel. GIS of the colon is extremely rare. The most important issue to be addressed for this type of tumor is the difficulty in making the correct preoperative diagnosis. Less than 10% of cases have been diagnosed as schwannoma preoperatively. A 58-year-old man was found to have a 3.5㎝ sized submucosal transverse colon tumor on the preoperative colonoscopy, abdominal CT and MRI. Wedge resection was done and the submucosal mass was diagnosed as schwannoma on the immunochemical staining. The immunochemical results were negative staining for CD 117(KIT) and CD 34 and positive staining for S-100 protein, which is all consistent with schwannoma. We report here on the first case of colonic schwannoma in Korea, along with a review of the literature.
황원자의 친핵성 치환반응(제15보) 메탄올 - 아세토니트릴 혼합용매계에서의 염화나프탈렌술포닐의 가용매 분해반응
이익춘,강한근,송호봉,이정균 충북대학교 건설기술연구소 1982 建設技術論文集 Vol.1 No.1
Heats of solution were measured calorimetrically for MeOH, MeCN, 1-NSC, 2-NSC in MeOH-MeCN mixtures. Kinetic studies for the methanolysls of 1-NSC. 2-NSC and BSC both in MeOH-MeCN and MeOH-C_6H_6 mixtures have been conducted. Heats of solution of all substrates were positive value in MeOH-MeCN mixtures. It has been shown that the number of free methanols increases by addition of acetonitrile in methanol. The methanolyais rates of studied substrates were faster in MeOH-MeCN mixtures than in MeOH-C_6H_6 mixtures. This shows that the solvation of transition state is major factor in determining reaction rates. It has been found that the rates increase in the order of electron donating ability of arylmethyl system, but there was peri-hydrogen effect for 1-NSC. The reaction was entropy-controlled.