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崔甲石,허찬욱 명지대학교 1983 明大論文集 Vol.14 No.-
本論文은 콤濾波器와 複素레소네이터를 사용한 디지탈 濾波器의 設計方法을 제시하고, 콤퓨터 시뮬레이션에 의하여 그 특성을 확인하였다. 設計法에 있어서는 濾波器特性의 주로우브와 사이드로우브 관계를 도입하였고, 이 設計法에서는 콤濾波器의 零과 複素레소네이터의 極이 상쇄되어 이 濾波器 構成 素子인 지연소자 수가 줄어들어 경제적으로 된다는 것을 보여주었다.
( Seong Wook Heo ),( Joong Goo Kwon ),( Chang Hyeong Lee ),( Ho Gak Kim ),( Eun Young Kim ),( Kyoung Chan Park ),( Jung Il Ryu ),( Dong Uk Ju ),( Byung Seok Kim ),( Ji Min Han ),( Joon Hyuck Choi ),( 대한소화기학회 2007 SIDDS Vol.9 No.-
Background/Aims: Colorectal cancer (CRC) is one of the leading causes of cancer death in Korea. Since CRC is preventable by colonoscopy with polypectomy, risk assessment tool is necessary for appropriate screening recommendation. Recently, some researchers of Harvard Medical School suggested a simple equation to obtain risk score for CRC. The score can be calculated as follows: risk score=(2: age 50-59 years)+(4: age 60-69 years)+(6: age≥70 years)+(1: BMI≥25-30 kg/m2)+(2: BMI≥30 kg/m2)+(1: history of past or current smoking)+(1: alcohol use>weekly). We tested the applicability of this scoring system in Korean population to verify the propriety of future prospective study. Methods: We retrospectively analyzed the results of colonoscopy done for health screening in men between April 2003 and August 2007 in Daegu Catholic Medical Center. Among 1845 cases, colorectal polyp was found in 665 cases. Risk scores were obtained using the equation in 654 eases with polyp. We evaluated the relationship between the incidence of high risk polyp (HRP) or CRC and the risk score. HRP was defined as more than 10 mm in size or severe dysplasia or villous component of pathology or multiple polyps. Results: Among 654 cases, HRP or CRC was found in 193 cases. The incidence of HRP or CRC had positive association with the risk score (P<0.05). The incidence of HRP or CRC also had positive association with the patient age (P<0.05) and age was a major influencing factor for the incidence. Within the same age group, there was no definite association between the incidence of HRP or CRC and the risk score (P<0.05). None of smoking history, alcohol use, or body mass index was an meaningful predictor of HRP or CRC in the same age group. Conclusions: The patients with higher risk score showed higher incidence of HRP or CRC. But age was the only significant factor having discriminative ability. We could not validate the risk scoring system suggested by Harvard group in this study. That might be partly explained by ethnic difference. Because We included not only CRC but also HRP in the analysis, that might be another reason. We hoped this easy risk scoring system can give us more information other than age to select men with higher risk of CRC but it was apparently disappointing. There is a need to develop our own predictive model for the incidence of colon cancer in Korea.