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대용량 텍스트 데이터베이스를 위한 효율적인 2단계 합성 요약 화일 방법
유재수(Yoo Jae Soo),강형일(Kang Hyung Il) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.4
In this paper, we propose a two-level hybrid signature file method(THM) to efficiently deal with large text database that use a term discrimination concept. In addition, we apply Yoo's clustering scheme to the two-level hybrid signature file method. The clustering scheme groups similar signatures together according to the similarity of the highly discriminatory terms so that we may achieve better performance on retrieval. The space-time analytical model of the proposed two-level hybrid method is provided. Based on the analytical model and experiments, we compare it with the existing methods, i.e., the bit-sliced method(BM), the two-level method(TM), and the hybrid method(HM). As a result, we show that THM achieves the best retrieval performance in a large database with 100,000 records when the number of matching records is less than 160.
유태현,한광협,박성하,김형길,문영명,한재호,조상호 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.2
Recent advances in both the diagnosis and treatment of hepatocellular carcinoma have improved the prognosis and changed the clinical significance of the recently increasing distant metastases. Distant metastases found after successful treament of the primary lesions are of great clinical significance for the treatment of hepatocellular carcinoma. The duodenum is a rare site of hematogenous metastases or direct invasion from hepatocellular carcinoma. A 23 year old man was admitted with upper gastrointestinal bleeding. He had been diagnosed with hepatocellular carcinoma and treated by a left lobectomy and chemoembolization. The patient was admittted for 12 months after the treatment of the primary tumor. Endoscopic examination revealed a mass in the duodenal bulb that protruded into the lumen. He died due to massive hematemesis. We report on a rare case of hepatocellular carcinoma with duodenal invasion in a 23-year-old male patient.
유재형,손동수 大韓小兒齒科學會 1984 大韓小兒齒科學會誌 Vol.11 No.1
The author surveyed the tooth development of 50 cleft affected children (M:34, F:16). The following results were obtained. 1. The difference between the chronologic age and dental age was 0.61 years in the cleft group and 0.15 years in the control group. The delay in tooth development was observed in the cleft group. 2. In the cleft group, there was no difference in the delay of tooth development between the boys and the girls. 3. In the cleft group, there was no difference in the delay of tooth development between the maxilla and the mandible. 4. The delay of tooth development was more severe in the bilateral cleft group than in the unilateral cleft group. 5. In the unilateral cleft, there was no difference in tooth formation between the cleft side and corresponding side.
십이지장 궤양 환자와 만성 위염 환자의 염증 분포의 차이 및 H. pylori 집락도와 염증도의 상관관계
유광하,진춘조,박형석,이재동,김예리,윤성욱,이수인,윤호상 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-
An inflammatory difference between the gastric antrum, body and fundus was studied in 39 H.pylroi positive duodenal ulcer and 29 H. pylori chronic gastritis patients. Also we studied correlation of H. pylori colony count and inflammatory severity. Patients with newly diagnosed duodenal ulcer and chronic gastritis were endoscoped and two biopsy secimens each taken from the antrum, body and fundus. Although intestinal metaplasia in antrum and inflammatory activity in fundus were more severe in chronic gastritis patients. another inflammatory difference was equally likely to be found between two groups. There was no definite histological inflammatory difference between duodenal ulcer and chronic gastritis patients. A positive correlation was found between the number of H. pylori and the severity of inflammation.
유재택,이광형 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
The packet communication protocol(X.25, TCP/IP etc.) was designed to ensure the efficient data transmission in the current public packet communication network. The packet communication network has various time of transmission delay because packet data doesn't use same path in the packet network. The retransmission setting time of the timer is also various. This paper proposes new method which decides retransmission timer based fuzzy theory in the packet communication protocol. The timer using the fuzzy Petri-net is modeled to implement the packet communication protocol. The fuzzy model of the retransmission timer is to infer the smoothed parameter αby constructing the fuzzy antecedent resultant from the errors between the elapsed time of one packet from the sender to the receiver and the estimated time. The fuzzy model of the timer is employed to adaptively produce the next packet timer value with the elapsed time and smoothed parameter α. We propose an effective method of network using packet mode.
PC U형 보를 이용한 포스트텐션된 넓은 보-기둥 골조의 거동
유영찬,임재형 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Since the floor structural systems are repeated over the height of building, a large amount of materials and a great deal of workmanship are required if effective systems are not provided, The previous study(1)(2)(3) developed the post-tensioned precast concrete system(PPS), consists of wide beams with U-shaped precast beam and concrete column, and carried out the experimental study about the estimation of PPS capacity against the earthquake. However, the experimental study in accordance with the representativeness of the whole structure couldn't completely understand the behavior of the whole structure, and have a little lack of presenting the design method. This study is to perform an case study on the behavior of the whole structure, and seismic capability. As a results, PPS system which apply the precast concrete structure and post-tensioned method is to present a sufficient ability of the structural performance against the earthquake and the vibration
김형준,김재규,김미경,박중원,유병철,박실무 중앙대학교 의과대학 의과학연구소 1997 中央醫大誌 Vol.22 No.2
After the discovery of hepatitis C virus, several reports of histologic charcteristics of hepatitis C have been published. The aim of this study is to evaluate histopathologic features of hepatitis C for diagnostic significance. Needle biopsy specimens obtanied from the liver of 14 patients with hepatitis C were evaluated for the diagnostic significance. All patients had not any evidence of hepatitis B, and autoimmune and alcoholic liver diseases. The specimens were histologically evaluted based on previously reported features of hepatitis C such as bile duct damage, lymphocytes infiltration, steatosis and so on. According to the mode of transmission, sporadic infections were 12 cases, posttransfusion hepatitis and Ⅵ drug abuser was 1 case. The commonst finding was sinusoidal inflammatory cell activation, especially lymphocyte (86%). And lymphoid follicles or lymphocytes aggregates (65%), steatatosis (65%) were found. According to the activity of hepatitis, significant difference of pathologic features could not be proposed, but most histologic features were showned in CAH. In conclusion, all the histologic characteristics of hepatitis C such as sinusoidal cell activation, lymphoid aggregates, steatosis were observed in this study. But the further study of comparative histologic evaluation between hepatitis C and other hepatitis is needed. And also, comparative study with larger subjects for specific histopathologic findings according to the activity of hepatitis and epidemiologic cause in needed.