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TFT-DXD 방식의 디지털 X-ray Detector를 이용한 고효율 의료 영상처리시스템
황재석,이재균,이채욱,Hwang, Jae-Suk,Lee, Jae-Kyun,Lee, Chae-Wook 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.4C
기존의 필름 X-Ray 및 CCD(Charge Coupled Device) 방식은 공간적인 제약과 진단 시간이 많이 걸리는 단점이 있다. 본 논문에서는 기존 방식들의 단점을 보완할 수 있는 TFT-DXD 방식의 digital X-ray detector (DR1000C)를 이용한 고효율 의료 영상처리시스템을 구현하였다. 본 논문에서 제안하는 DR1000C를 이용한 의료용 영상처리시스템은 기존의 X-Ray 방식에 비해 공간 효율성이 높고 진단 시간이 짧아진다는 장점이 있다. 영상처리시스템에서 획득한 영상을 고화질로 만들기 위해 1900*1200의 해상도를 가지는 LCD 컨트롤 드라이버를 개발하였고, 영상의 성능향상을 위해 enhancement unsharp masking 기법을 제안하여, 기존의 방식과 비교하였다. The Film X-ray and the CCD method of current medical image system have the disadvantages such as required large place and diagnosis time. In this paper, we implement an effective medical image system using TXT-DXD method's digital X-ray detector(DR1000C). The implemented medical image system has advantages of placing efficiency and short diagnosis time. In order to make the image out of the system more effective, we develop an LCD(Liquid Crystal Display) control driver, having the resolution of 1900*1200. And we propose an enhancement unsharp masking method to update image enhancement of DR1000C medical image system, and compare it with the current methods.
유화형 액막법에 의한 Zn 성분의 추출시 액막의 안정성
오치훈,황재석,심재우,이철태 ( Chi Hoon Oh,Jai Suk Hwang,Jae Woo Shim,Chul Tae Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.4
유화형 액막을 이용하여 D₂EHPA-Kerosene-Span 80-H₂SO₄ 계에서 Zn성분의 추출시 액막의 안정성에 영향을 미치는 에멀젼의 파괴, swelling 현상 및 에멀젼의 morphology를 조사하였다. Zn 성분의 추출시 액막의 안정성에 대한 최적 조건은 계면활성제 Span 80의 농도 2∼3vol.%, 추출담체 D₂EHPA의 농도 5∼7vol.%, 막강화제 paraffin oil의 농도 10 vol.% 였으며, 외부수용액에 대한 에먼젼의 비 0.1, 유기상에 대한 내부수용액의 비는 1.0이 적절하였다. The stability of liquid membrane in the extraction process was investigated through the extraction of the Zn component by using W/O/W emulsion type liquid surfactant membrane which was D₂EHPA-Kerosene-Span 80-H₂SO₄ system. The highest stability for liquid membrane through the Zn extraction process was obtained under the following conditions. That conditions were that span 80 concentration, as surfactant, of 2∼3 vol. % ; D₂EHPA concentration, as extractant, of 5∼7 vol. % ; paraffin oil concentration, as membrane strengthening agent, of 10 vol. % ; emulsion volume ratio to the external aqueous phase volume of 0.1, and internal aqueous phase volume ratio to the organic phase volume of 1.0.
한국인 간세포암 환자들의 임상특징 및 예후: 전국규모 무작위 표본 추출 조사사업 결과
임영석 ( Young Suk Lim ),신동현 ( Dong Hyun Sinn ),김승형 ( Seung Hyung Kim ),황재석 ( Jae Seok Hwang ),한광협 ( Kwang Hyub Han ) 대한간암학회 2014 대한간암학회지 Vol.14 No.2
Background/Aims: Given the high incidence and mortality rate of hepatocellular carcinoma (HCC), ensuring high quality of registry data is important for the improvement of health service. Registries by voluntary reporting often lack case completeness and may cause selection bias. A statutory Korean Central Cancer Registry (KCCR) has case completeness and provides accurate information on HCC incidence, but provides limited information about HCC characteristics. Methods: The Korean Liver Cancer Study Group (KLCSG) and the KCCR jointly built a nationwide cohort of patients who were diagnosed with HCC between 2003 and 2005. Out of 31,521 new HCC cases that were registered at the KCCR between 2003 and 2005, 4,630 cases (14.7% of total HCC cases) were randomly selected and abstracted from 32 hospitals nationwide, and followed up until December 2011. After excluding 110 patients who met the exclusion criteria, a total of 4,520 HCC patients were analyzed. Results: Mean age at the diagnosis of HCC was 57.1±10.8 years, and males comprised 81.0%. Hepatitis B was the predominant etiology (72%), and hepatitis C comprised 12%. Stage at diagnosis was 10%, 43%, 28%, 11% and 8% for modified International Union Against Cancer (mUICC) stages I, II, III, IV-A and IV-B, respectively. Initial treatment modalities were transarterial therapy in 53%, surgical resection in 10%, local ablation in 7%, and liver transplantation in 1%. The median survival was 1.4 years, and the 1-, 3-, and 5-year survival rates were 56%, 35% and 27%, respectively. Age, gender, Child-Pugh class, etiology, tumor stage at diagnosis, and treatment modality were factors independently related to survival. Conclusions: About half of HCC patients are diagnosed at advanced stages in Korea. Curativeintent treatments are rarely applied to patients. This data provides unbiased information about the characteristics and outcome of HCC patients in Korea. (J Liver Cancer 2014;14:97- 107)
종례 : 내시경 점막하 박리술 직후 발생한 급성 심근 경색 1예
이정민 ( Jung Min Lee ),이현웅 ( Hyun Woong Lee ),홍윤석 ( Yoon Suk Hong ),김은수 ( Eun Soo Kim ),박경식 ( Kyung Sik Park ),조광범 ( Kwang Bum Cho ),황재석 ( Jae Seok Hwang ),김형섭 ( Hyung Seop Kim ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.4
Endoscopic methods such as endoscopic mucosal resection or endoscopic submucosal dissection (ESD) have been increasingly used for the treatment of gastric adenoma and early gastric cancer. Especially, ESD is very useful since it allows en bloc resection of large lesions. Bleeding and perforation are well known as common complications after ESD. However, there is no report of acute myocardial infarction associated with ESD. We report a case of acute myocardial infarction which was detected immediately after ESD. (Korean J Gastroenterol 2010; 56:249-254)