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간세포암의 나선식 전산화 단층촬영 : 조영제의 역동적 급속 투여법의 유용성
윤완규 대한영상의학회 1996 대한영상의학회지 Vol.35 No.1
Purpose : To assess the value of dynamic fast infusion of contrast material in the detection and diagnosis of hepatocellular carcinoma(HCC) with spiral CT. Materials and Methdos : Two-phase dynamic spiral CT was performed in59 patients with 104 HCCs. 150ml of nonionic contrast material was injected with an automatic injector at the rate of 5 ml/sec. Two-phase images were obtained at 20-45 sec(arterial dominant phase) and 2-5 min(equilibrium phase)after the initiation of bolus injection of contrast material. The tumors were divided into three groups(<3cm, 3-5cm, and>5cm) according to the size and the enhancement patterns on two-phase images were compared. Results : In the arterial phase, HCCs showed total or partial hyperattenuation in 79% of cases(82/104), isoattenuation in 12%, and hypoattenuation in 9%. In the equilibrium phase, HCCs showed hypoattenuation in 86%(89/104) and isoattenuationin 14%. The most common and characteristic enhancement patterns of HCCs were hyperattenuation in the arterial phase and hypoattenuataion in the equilibrium phase ; in the latter, capsules were demonstrated in 45% of cases. Invasions of the portal and/or hepatic vein were demonstrated in 34% of cases. Conclusion : Dynamic fast infusion(5ml/sec) of contrast material(150ml) is useful in the detection and diagnosis of HCCs with spiral CT.
尹完圭,洪起煥,金弘秀 전북대학교 의과학연구소 1983 全北醫大論文集 Vol.7 No.1
Nasopharyngeal angiofibroma is a comparatively rare tumor although it is most common begin tumor of the postnasal spce. The tumor is said to have a predilection for adolescent males, to be associated often with sexual development and to be self-limiting. The tumor is extremely vascular, locally spaceoccupying and nonencapsulated lesion. This report represents the four cases of nasopharyngeal angiofibroma which were surgically removed through the Modified Owen's transpalatal approach at Dept. of Otolaryngology, Jeonbug National University Medical School from Mar. 1980 to Feb. 1982.
송창준,정연수,최창락,윤완규,조준식 충남대학교 의과대학 지역사회의학연구소 1995 충남의대잡지 Vol.22 No.2
Purpose : To evaluate the computed tomography (CT) findings of the cervical tuberculous lymphadenitis Methods and materials : The CT features in 10 patients of tuberculous lymphadenitis were retrospectively reviewed. We characterized the morphologic appearances of lymphadenopathy on post-contrast CT scan and comparatively evaluated the densities of central necrotic portion and peripheral solid portion of necrotic nodes on pre-contrast CT scan. All examines were performed on a General Electric Hispeed Advantage RP System. Ten millimeter and five millimeter contiguous sections from skull base to thoracic inlet were obtained for the pre-contrast and post-contrast images respectively. Results : Most patients were young adults. A painless neck mass was the most common chief complaint and the duration of the symptoms was about 5 months. The average number of diseased lymph nodes was 3.7. Unilateral involvement was 4 times as common as bilateral location. Central necrotic lymphadenopathy was 78.3% of 37 enlarged lymph nodes and the density of the nerotic portion was isodense to the density of the peripheral wall on pre-contrast images in 71.4% of necrotic lymph nodes. The most common morphologic features of cervical tuberculous lymphadenitis was the type of a multichambered or conglomerated necrotic lymphadenopathy with a peripheral irregular enhancement. Conclusion : The tuberculous cervical lymphadenitis was highly suggestive when the diseased lymph nodes show the central necrosis, the morphologic features of multichambered or conglomerated necrotic lymphadenopathy with a strong peripheral irregular contrast enhancement, and necrotic materails isodense to peripheral solid portion on pre-contrast CT scan in young adult patients who complain of a painless neck mass.
金弘秀,申庸鎬,金亨鎌,尹完圭,權三鉉 전북대학교 의과학연구소 1982 全北醫大論文集 Vol.6 No.1
In 1960, using Lynch's suspension Laryngoscope, Scalco performed the microsurgery in the treatment of laryngeal polyps and other laryngeal disease. In 1965, Kleinsasser reported a new technique of laryngomicrosurgery for laryngeal diseases. Laryngomicrosurgery was performed on 28 cases with various laryngeal disease at the department of E.N.T, Jeonbug National University Medical School from Oct. 1979 to Dec. 1981. The following results were obtained. 1. Sex distribution was male 1.3:female 1. 2. Age distribution showed 8 cases(28.5%) in 5th decade, 7 cases(25%) in 4th decade and 4 cases(14.2%) in 3rd decade in order. 3. Chief complaints were hoarseness 24 cases(85.7%), dyspnea 6 cases(21.4%) and foreign body sensation 5 cases(17.8%) in order. 4. Distribution of disease in order of frequency were vocal polyp 14 cases(50%), vocal nodule 4 cases(14.3%), papilloma 3 cases(10.7%), Rienke's edema 3 cases(10.7%), intubation granuloma 2 cases(7.1%), Leukoplakia 1 cases(3.5%) and traumatic web formation 1 case(3.5%). 5. Maximum phonation time(MPT) was measured before and after operation in 13 cases and prolonged in all cases.
실내 화재상황에서 Ad-hoc 네트워크를 이용한 실시간 센싱 데이터 전송 및 AI 기반 전파 경로 예측을 통한 피난 경로 안내 시스템
김소명(So-Myeong Kim),박남웅(Nam-Ung Park),윤완규(Wan-Kyu Yoon),유상조(Sang-Jo Yoo) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 미래에 화재가 전파되는 범위를 예측하여 사용자에게 최적의 대피 경로를 제공하는 방법을 제안한다. 화재 감지 온도 센서에서 수집한 온도 데이터를 서버에 전송하고 서버에서는 수신된 데이터로 현재 화재 반경을 계산한다. GBM(Gradient Boosting Machine)을 이용한 예측 모델을 통해 현재 화재 반경을 기반으로 미래의 화재 반경을 미리 예측하고, 이를 고려한 탈출구까지의 최적의 대피 경로를 제공한다. 시뮬레이션 연구를 통해 본 논문에서 제안하는 방법이 화재 반경을 미리 예측한 최적의 대피 경로를 제공하는 것을 확인할 수 있다.