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김제형,황호근,최두환,유광현,류준형,최석채,김학철 圓光大學校 醫科學硏究所 1995 圓光醫科學 Vol.11 No.1
Biloma has been defined as an extraductular collection of bile within a defined capsular space. Development of an intraabdominal bile collection usually occurs secondary to traumatic or iatrogenic injury including abdominal surgery, percutaneous catheter drainage and transhepatic cholangiogram. Spontaneous bile leakage associated with other primary causes, including sickle cell anemia, gall bladder cancer and hepatocellular carcinoma, has been reported rarely. We present a case of biloma secondary to traumatic injury with liver biopsy, who had right upper guadrant pain, jaundice and yellowish skin discoloration in a patient with cholangiocellular carcinoma. Huge biloma was confirmed by percutaneous transhepatic biliary drainage and drained with pig tail catheter successfully. A case of huge biloma secondary to liver biopsy is presented with brief review of the literatures.
김제형,황호근,김학철 圓光大學校 醫科學硏究所 1997 圓光醫科學 Vol.13 No.1-2
Background Tumors of the ampulla of Vater are usually reported in the group of periampullary tumors, as they have similar clinical symptoms and therapeutic managements due to their neighboring region. And there is no review of it as an isolated literature in Korea and only a few in the world. So we review the tumors of the ampulla of Vater Subject and Method The specimens from 20 carcinoma (surgery:18, endoscopy:2) and 3 adenoma (surgery:2, endoscopy:l) patients of the ampulla are selected from 106 cases of periampullary tumor provided by Wonkwang University Hospital during the period of 1984 to 1995. The subjects are reviewed and analysed by various factors with SPSS analytic program. Results 1) Of their distribution, it is usually distributed over the 5th decade and most frequently in the 7th decade, and their mean age is 64 year old. Sex ratio of male to female is 1.6:1. 2) Their frequency are in the order of fever & chillness, jaundice, right upper quadrant pain, weight loss and pruritus in clinical manifestations and hyperbilirubinemia. elevation of transaminase and alkaline phosphatase in laboratory examination. 3) In diagnostic procedures of ampullary tumors, the abdominal sonogram and computer tomogram have indirect abnormal findings of them with high freqency(82.6%) and the direct finding of them with moderate frequency(56.2%). But all cases have had abnormal findings on the ampullary region by duodenoscopy. 4) When they are first detected as tumors, the maximal size of benign tumor(4.66±0.47㎝) is significantly larger than malignant tumor(1.43±0.66㎝). 5) Among 20 malignancies, their staging distribution are like this: stage Ⅰ: 8(34.8%), stage Ⅱ: 3(13.0%), stage Ⅲ 9(39.1%). When resection were performed in 18 cases(stage Ⅰ: 8, Ⅱ: 3, Ⅲ: 7), their mean survival time of stage Ⅰ, Ⅱ and Ⅲ are accordingly 87, 16 and 13 months. And stage Ⅰ has significantly longer survival time than others. Conclusions As the above results, it is concluded that clinical manifestations are important at least in ampullary tumor, tumor size is larger in benign than malignant tumors when they are detected and better prognosis in early stages of malignant ampullary tumor. These finding suggest early detection of malignant ampullary tumor might be related to the relationship between the characteristics of invasiveness in malignancy and the characteristic anatomy that is narrow luminal capacity in ampulla of Vater.
집합 값을 갖는 애트리뷰트에 대한 효율적인 조인 알고리즘
김제형,황환규 강원대학교 정보통신연구소 2007 정보통신논문지 Vol.11 No.-
In this paper we study an efficient processing of set join operation which is important in object-relational database systems. Up to date there has been limited research on the evaluation of query operators that apply on sets. Evaluating set joins is difficult, and naive approaches lead to algorithms that are very expensive. We propose set join algorithms that utilize inverted files and bitmap and compare them with block nested loops algorithms. Our experiments show that the vertical bitmap block nested loop algorithm outperforms the block nested loops algorithms.