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진행성 위암과 동반된 후복막 섬유화증 7예의 임상적 고찰
장재영,천영국,최우봉,김진오,조주영,이준성,이문성,심찬섭 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1
Background/Aims: Retroperitoneal fibrosis is a fibrosing disease process which frequently develops ureteral obstruction. Malignant retroperitoneal fibrosis has been reported that various types of cancer including cancer of the breast, stomach, prostate, lung, cervix, uteri, colon, pancreas, ovary, and even Hodgkin's disease. While the pathogenesis remains obscure, small foci of metastatic neoplasm in the retroperitoneal space can elicit a desmoplastic reaction in secondary form to malignancy. Methods: Recently we experienced 7 cases of retroperitoneal fibrosis with advanced gastric cancer. So, we report 7 cases of retroperitoneal fibrosis with clinical and radiologic characteristics. Results: The most common signs and symptoms were related irreversible renal dysfunction. The urologic finding noted medial deviation of the involved ureters and hydronephrosis Conclusions: Clinical manifestations are abdominal pain, back pain, hydronephrosis, and uremia. When sudden back pain and hydronephrosis develop in advanced malignancy, physicians should be considerd for retroperitoneal fibrosis.
새로운 방법에 의한 1,1-R,R'-2,3,4,5-테트라페닐-1-실라사이크로펜타디엔의 합성
주완철,흥장환,최석봉 성균관대학교 기초과학연구소 1988 論文集 Vol.39 No.1
A new synthesis of 1,1-R, R',-2, 3, 4, 5-tetraphenyl-1-silacyclopentadiene was described. It was synthesized from one-pot reaction of 1,4-dilithio-1, 2, 3, 4-tetraphenylbutadiene with R_nSiCl_4-n (n=0, 1, 2), where 1, 4-dilithio-1, 2, 3, 4-tetraphenyl butadiene was prepared from the reaction of diphenyl acetylene and lithium metal in ether solution with good yield (80∼85%).
치료용 방사선의 입사각에 따른 광섬유 방사선량계의 체렌코프 빛 측정 및 분석
장경원,조동현,유욱재,신상훈,서정기,이봉수,박병기,문주현 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, we have measured scintillating light generated in a fiber-optic dosimeter by high energy photon and electron beams using a charge-coupled device. The intensity of Cerenkov lights are also measured and characterized as functions of incident angles and energies of the high energy beams from a clinical linear accelerator. To minimize or remove Cerenkov light, a simple subtraction method using a background optical fiber and wavelength discrimination method using optical filters are investigated. Also, the intensities of Cerenkov light induced by high energy photon and electron beams are compared.
장홍석,최대봉,황주호,홍준희 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
The balance of high speed spindle system with high precision rotation like grinding machine is very important. Traditionally, we use trial and error method to balance the spindle. It takes much time. So we are developing the automatic balancing equipment being used in the grinding machine. The balancing head we develop is wireless. It will be used high-speed grinding machine. We use influence coefficient method to control the automatic balancer. Experiments are based on automatic and manual balancing. We perform test of the vibration filter. It helps to remove noise. The filter and experiments with automatic balancing controller show that automatic balancing control can be successfully achieved with the quick response and good stability characteristics.
중환자실에서 기계적 환기를 시행받는 환자들의 기관내삽관 튜브의 기낭내압
이영주,윤장운,문봉기,이규완,박미미,이영석 아주대학교 1997 아주의학 Vol.2 No.2
Background and Objectives : High volume, low pressure (HVLP) cuffed tubes have been substituted for low volume, high pressure (LVHP) cuffed tubes in order to reduce complications created by the cuffed endotracheal tubes contact with the tracheal wall. Several physidans, however, prefer to use the LVHP cuff for habitual or economic reasons. Even so, careless cuff Inflation of the HVLP cuff could also induce complications. The purposes of this study were to see whether there are any differences between the usual intracuff pressure (UICP) and the Optimum intracuff pressure (OICP), to compare the OICP of three groups, and to study the correlation between the OICP and the peak inspiratory pressure (PIP) of three kinds of endotracheal tubes under mechanical Ventilation. Methods : 82 adult patients, upon admission of the ICU, were divided into 3 groups with different cuffed tube types according to the following: Portex Profile group (n=66), HVLP cuffed tube; Portex Regular group (n=11), LVHP cuffed tube; Rusch Red group (n=5), LVHP cuffed tube. We used the Portex cuff pressure manometer for Portex Profile group, the Hewlett-Packard pressure transducer for Portex Regular, and Rusch Red group to measure the intracuff pressure (ICP). The OICP was measured with the minimal leak technique (MLT). Intracuff pressure difference (ICPD) was calculated by subtracting OICP from UICP. Results : UICP and OICP of Portex Profile group were 33.12±22.25 ㎝H₂O, 22.02±12.5㎝H₂O, Portex Regular group, 70.09±30.88 ㎝H₂O, 69.45±30.41 ㎝H₂O and Rusch Red group, 378.40±38.60 ㎝H₂O, 337.60±74.45 ㎝H₂O. Significant difference was shown among the groups (p < 0.05). The significant difference of the PIP was not seen among the groups. Significant correlation between OICP and PIP (regression = 0.463, p < 0.01) was demonstrated only in Portex Profile group. ICPD of three groups were as high as 84 ㎝H₂O to as low as -56 ㎝H₂O. About 40% of the patients showed the allowable range. Conclusions : This study suggests that routine check-ups of ICP are needed when the patients are admitted to the ICU. The OICP of the HVLP cuffed tube is 1/3 -1/15 of the LVHP cuffed tube. Therefore, the routine use of the HVLP tube is highiy recommended. The OICP shows positive correlation with the PIP. This suggests to make every effort to reduce the PIP.
광섬유 집합체 센서를 이용한 6MV 광자선의 반음영 및 심부선량백분율 측정
신상훈,장경원,조동현,유욱재,서정기,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, a fiber-optic bundle sensor has been developed using water-equivalent organic scintillating fibers for photon beam measurement. Beam penumbra and percent depth doses(PDD) are measured according to the depth of the photon beam. This sensor has many advantages such as high resolution, real-time measurement and ease of calibration over conventional radiation measurement devices.
광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교
조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.
외부 프리스트레스 도입에 의한 노후된 콘크리트 거더교의 보강성능평가
박승범,홍석주,이봉춘,장석호,권혁준 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
One of the promising methods to enhance the flexural strength of a externally prestressed girder is to place the tendons with large eccentricities. The analysis and design of composite girders prestressed by external tendons involve difficulties related mainly to the position of anchorages and the construction sequences. This study was conducted on the concrete bridges reinforced by the continuous girders and the external prestressing. The test results in this study showed that the external prestressing of a composite girder increased the range of the elastic behavior, reduced deflections, increased ultimate strength, and added to the redundancy by providing the multiple stress paths.
Fast Coordinate Conversion Method for Real-time Weather Radar Data Processing
Jang, Bong-Joo,Lim, Sanghun,Kim, Won Korea Multimedia Society 2018 The journal of multimedia information system Vol.5 No.1
The coordinate system conversion of weather radar data is a basic and important process because it can be a factor to measure the accuracy of radar precipitation rate by comparison with the ground rain gauge. We proposed a real-time coordinate system conversion method that combines the advantages of the interpolation masks of SPRINT and REORDER to use tables of predetermined radar samples for each interpolated object coordinate and also distance weights for each precomputed sample. Experimental results show that the proposed method improves the computation speed more than 20~30 times compared with the conventional method and shows that the deterioration of image quality is hardly ignored.