정량적관상동맥조영술의 정확도 및 재현도

조용근,황진용,박헌식,채성철,전재은,박의현 慶北大學校 醫科大學 1996 慶北醫大誌 Vol.37 No.4

목적 : 정량적관상동맥조영술이 최근 널리 보급되고 있지만 국내외를 막론하고 이의 정확도 및 재현도에 관한 연구가 불충분하여 본 연구를 하였다. 대상 및 방법 : 110명의 환자에서 미국 General Electric사의 Advantx L/C/LP 디지탈혈관찰영기와 미국 USCI사의 좌관상동맥용 Judkins형의 Pro-Flo XT^(TM) 6F 도자를 이용하여 좌관상동맥조영술을 같은 각도에서 3회 실시하고 도자의 외경을 일본 Mitutoyo사의 정밀도 0.01㎜의 micrometer로 측정한 후 측정된 도자의 실제 직경과 정량적관상동맥조영술로 측정된 관상동맥의 직경을 비교하였다. 결 과 : USCI® Pro-Flo XT^(TM) 6F 좌관상동맥용 도자의 실제 외경은 1.91±0.03㎜이었고 정량적관상동맥조영술로 측정 한 도자의 외경은 1.94±0.11㎜이었다. 도자를 5.7F로 calibration했을 매 도자의 외경은 1.87±0.12㎜이었다. 세번 다 다른 화상에서 측정한 경우 근위부관상동맥 직경의 차이는 0.02±0.12㎜이었고 같은 화상에서 3회 측정하였던 경우에는 0.11±0.01㎜이었다. 결론 : 정량적관상동맥조영술의 정확도 및 재현도는 사용에 적합한 정도이나 적지 않은 문제점에 대한 보완이 필요하다고 생각된다. During quantitaive coronary angiography(QCA), contrast filled catheter is usually used as a scaling device. However the real diamerer of catheter is almost always smaller than the listed diameter. We measured the real diameter of catheters with precision micrometer(Mitutoyo® Japan). After caliberating the catheter as listed French size and diameter, we did QCA at the same tube position of the diameters of catheter and proximal left coronary artery. All measurements were done 3 times consecutively. The mean real diameter of USCI® Pro-Flo XT^(TM) 6 F left Judkin catheter was 1.91±0.03 ㎜. The mean QCA diamter of the same catheter was 1.94±0.11 ㎜. When we calibrated catheter as 1.91 ㎜. the mean QCA diameter was 1.87±0.12 ㎜. The mean differences of the diameters of the proximal left coronary artery were 0.20±0.12 ㎜ when the measurements were done in three different frames. When the measurements were done in the same frmae, the mean difference decreased to 0.11±0.01 ㎜. We conclude that the precision and reproducibility of QCA are within reasonable range, but more refimement is needed.

소규모 하천 수질 예측을 위한 Computer Program(I)

趙容璡,全太誠 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

There are many computer modeling programs for the river and lakes. QUAL2E is the most useful program in the U.S.A. But it does not fit to small rivers in Korea.And the language,Fortran 77, is uncomfprtable for the users. So I've studied it with Visual Basic in the windows system.

COD/SO₄ 比가 相異한 廢水의 염기성 處理時 動力學에 관한 硏究

趙容璡,全太誠 충주대학교 1990 한국교통대학교 논문집 Vol.24 No.-

A laboratory experiment was conducted in order to develope necessary design paramenters for the anaerobic treatment with different COD/SO₄ratios. The laboratory anaerobic contact diegesters were fed with a synthetic wastewater mainly containing acetic acid. The chemical oxygen demand (DOD) of the wastewater was 2,000 ㎎/L, however the COD/SO₄ratio adjusted to 1.0, 1.7, 2.7, 4.6, and 13.3. An increment of maximum substrate utilization rate(K) and a decrement of half-velocity constant (Ks) were observed at the COD/SO₄ratio of more than 2.7. At the COD/SO₄ratio of 2.7, the largest value of the maximum specific growth rate(u) as well as the smallest value of the minimum mean cell residence time (SRT ??) were observed.

고등어 및 정어리 선어의 휘발성성분

조우진,김훈,정연정,이영미,정은정,차용준 창원대학교 생활과학연구소 2002 생활과학연구 Vol.- No.6

This study was conducted to identify volatile compounds, associating with quality deterioration, which may play roles as indicators for quality assessment in fresh mackerel and sardine. Volatile compounds were analyzed by liquid liquid continuous extraction(LLCE)/GC/MSD methods. A total of 83 and 81 volatile compounds were detected in fresh mackerel and sardine, respectively, and these compounds were mainly composed of aldehydes(12 in raw mackerel, 11 in raw sardine), ketones(7, 4), alcohols(15, 14), esters(1, 3), aromatic compounds(13, 15), terpenes(5, 7), S-containing compounds(2, 2), hydrocarbons(13, 11) and miscellaneous compounds(2, 1). Most of compounds including carbonyls, alcohols, aromatic compounds and hydrocarbons were derived from lipid oxidation, and some compounds were detected from microbial degradation. It was supposed that LLCE method was proper to seek indicators for quality assessment in fresh mackerel and sardine, because of various volatile compounds derived from nonthermal lipid oxidation.

초고속 전송에 대한 Ultrashort Laser Pulse의 새로운 스펙트럼 분석

전진성,조형래,오용선 韓國海洋大學校電波通信硏究所 1999 電波通信硏究所論文集 Vol.1 No.-

본 논문에서는, Class-2 PRS 모델의 전달함수인 Raised-Cosine 펄스를 이용하여 극초단 레이저펄스의 전송특성을 분석하였다. 이는 Class-1 PRS 모델에서와 같이 부분응답시스템의 수정된 모델로부터 얻어지는 고차원펄스를 이용하여 그 차수의 증가에 따라 FWHM폭이 현저히 감소하여 분석하고자 하는 극초단펄스의 형태에 근접하는 펄스를 제시하였으며, 그 스펙트럼과 전송대역폭도 차수에 따라 일률적으로 유도되므로 Gaussian, Sech형태의 펄스 같은 고전적인 방법과는 달리 광범위하고 정확한 전송특성을 분석하는데 매우 유용함을 밝혔다. 먼저, 부분응답시스템의 일반적인 모델을 수정하여 어떤 형태의 고차원펄스도 적용할 수 있는 새로운 방법을 제안하였다. 그리고 제안된 모델을 이용하여 어떠한 형태의 FWHM을 가지는 극초단펄스의 전송에 대한 새로운 분석 방법을 제안하였다 제안된 방법을 사용하여, 설정 펄스 폭을 τ=1(㎰)으로 설정, 고차원펄스의 차수 n=1~100에서 얻어지는 FWHM 1(㎰)~100(fs)의 극초단펄스의 스펙트럼을 제시하였고, Class-2 PRS 모델의 FWHM 폭이 Class-1 PRS 모델보다는 차수 n에 따라서 약 50~100(fs)정도 좁은 FWHM 폭을 가짐을 밝혔다. 이에 대한 전송특성은 레이저펄스의 보편적인 신호방식인 Unipolar 체계로 설정하여, 가능한 펄스간격에 따른 PSD를 유도하여 제시하였다. 이러한 결과들은 고전적인 실험 방법과는 일치함을 물론 미래 극초단펄스 연구에 대한 혁신적인 방법으로 사용될 수 있을 것이다. In this paper, we analyze transmission characteristics of ultrashort laser pulses using the property of Raised-cosine pulse which are systematically obtained following Class-2 PRS model. The high-order pulses are easily derived from a modified PRS system model as Class-1 PRS model. This may be based on the fact that the spectra and bandwidths of the high-order pulses are beautifully related to their orders. And we make clear they are very useful to cover wider area and more accurate transmission characteristics of ultrashort pulses than Gaussian or Sech pulse approximations used conventionally. First modifying the generalized PRS system model, we propose a new model for deriving any type of high-order pulse. And we offer a novel analysis method of ultrashort pulse transmission which has any shape and FWHM, using the proposed model. In addition, by fixing the pulse range τ=1(㎰) and varying the order of the pulse from n=1 to n=100, we obtain spectra of ultrashort pulses with 1(㎰)~100(fs) FWHM's, and width of FWHM in the Class-2 PRS model 50~100(fs) smaller than Class-1 PRS model. As a one-step further, we derive PSD's of their pulse trains when they are applied to Unipolar signaling scheme. These PSD's are decided in the range of possible pulse intervals. All of these results are not only coincided with some conventional experimental works but also will be applied to any pioneering ultrashort pulse in the future.

폐결핵의 조기진단에 있어서 이중중합효소연쇄반응법의 유용성

조성란,최영진,김용훈,이철세,김영창,김휘준 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2

Background: Pulmonary tuberculosis is a great public health problem in Korea. Early detection of Mycobacterium tuberculosis (M. tuberculosis) in clinical samples becomes more and more important in the control of tuberculosis. Recently, molecular methods have been applied to early detection of M. tuberculosis. Methods: To elucidate the effectiveness of nested polymerase chain reaction (PCR) in early diagnosis of pulmonary tuberculosis, we peformed Acid-fast bacilli (AFB) stain, AFB culture, and nested PCR on 84 sputa. Results: 8 (9.5%) specimens were positive by AFB stain, 17 (20.2%) by AFB culture, and 15 (17.9%) by nested PCR. Using AFB culture as standard method, the sensitivity of AFB stain and nested PCR was 47.1% and 82.4%, respectively. The specificity of AFB stain and nested PCR was 100% and 98.5%, respectively. Conclusions: Nested PCR was more sensitive than AFB stain and had shorter processing time(24-48hrs) than AFB culture. So it may be effective to use nested PCR in order to detect M. tuberculosis when AFB smear Is negative.

인트라넷 기반 복합운송 정보시스템 개발

조용준,박윤선 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

Until now, in overseas trading, shipper, export[import] agents and airways have communicated with each other by exchanging documents through off-line or by fax or e-mail. But it causes repetition of paper-work, delay and complexity. In this study, we solved these problems using Internet technique. We also offer environments that can strengthen the competitiveness. It is called Cargonet System. It constructs not only the necessary information system but also the corresponding network among agents, forwaders, airways, Client users use only Web-Brwoser. Therefore, it enables to update rapidly for system extension.

질소-프로판-암모니아 가스분위기에서 침탄질화시 공기첨가량이 침탄질화특성에 미치는 영향

조효석,이준범,노용식,이상윤 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1

This study has been performed to find out some effects of air and ammonia addition to a given quantity of nitrogen and propane gas mixture on the carbonitriding characteristics of low carbon steel after carbonitriding for one hour and two hours at 870℃. Carbon potential analysis has shown that the carbon potential decreases with increasing air addition at a given amount of ammonia and also with increasing ammonia addition at a given amount of air. Microscopical observation has revealed that the depth of internal oxidation increases with increasing air addition to a given gas atmosphere and the formation of surface abnormal layer considerably occurs in the gas mixture of more than 2.5% ammonia addition. If has been found by hardness measurements that the effective case depth increases with increasing air addition to a given gas mixture, whereas in more or less decreases with ammonia addition.

비화농성 삼출성 복수를 동반하는 질환에서 복막 침생검의 진단적 의의

정종훈,서용태,오덕환,채종구,정춘해,조건국 朝鮮大學校 附設 醫學硏究所 1986 The Medical Journal of Chosun University Vol.11 No.1

Percutaneous needle biopsies of peritoneum with Abrams needle and Cope needle were done un 64 patients with non-purulent exudative ascites, who was admitted to the department of internal medicine, Chosun University hospital, from January 1978 to Deccmber 1983. The diagnostic significance and safety of the needle biopsy was estimated. The results were as follows. 1. Adequate peritoneal tissue for pathological diagnosis was obtained in 53 cases(82.8%) among 64 cases. (Abrams needle 84.8%, Cope needle 80.6%) 2. Definitive diagnosis was obtained in 31 cases among 53 cases (58.6%). (Tuberculosis 23 cases, malignancy 8 cases). 3. As compared final diagnosis with biopsy result, the rate of final diagnosis corresponding with biopsy diagnosis was 58.8% in tuberculosis and 26.3%, in malignancy, but the rate of biopsy diagnosis corresponding with final diagnosis was 100% in both tuberculosis and malignancy. 4. Cases of chronic non-specific inflammation which were diagnosed by biopsy were 13cases(24.5%)among 53 cases, and among these cases, tuberculosis was 69.2% and malignancy 30.8% on final diagnosis and among 53 cases, histologically normal was 9 cases(16.9%) of which 33.3% was tuberculosis and 66.7% was malignancy on final diagnosis. 5. Of the malignant cases on final diagnosis, Positive cytologic examination of ascitic fluid was 16.7% 6. Primary losions of cancerous peritonitis were stomach cancer (38.9%) hepatocellular cancer(22.2%) colon cancer (11.1%) ovarian cancer (11.1%) Pancreatic cancer (5.6%). 7. Complication of percutaneous peritoneal biopsy was local swelling with leakage of ascitic fluid and the accident rate were 36.4,% in Abraham needle and 3.2% in Cope needle.

용융염산화 반응기에서 기체체류량 및 기-액 흐름특성

조용준,양희철,은희철,유재형,김준형 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

용융염산화는 혼성폐기물과 유해폐기물을 효과적으로 산화 및 분해할 수 있는 소각대체기술중 하나이다. 본 연구에서는 직경이 0.079 m이고 높이가 0.653 m인 용융염산화 반응기에서 기체체류량 및 기-액 흐름특성에 대한 연구를 수행하였다. 액상으로 용융탄산나트륨을 기상으로 건조된 공기를 사용하였으며 기체유속(0.05-0.22 m/s)과 용융염온도(870-970℃) 변화가 기체체류량 및 기-액 흐름특성에 미치는 영향을 규명하였다. 기체체류량은 용융염 온도가 상승함에 따라 증가하였는데, 이는 용융염 온도의 증가로 인해 용융된 탄산나트륨의 점도와 표면장력이 감소하였기 때문이다. 실험에서 얻어진 기체체류량 데이터를 drift-flux 모델에 적용하여 용융염반응기 내의 흐름특성을 규명할 수 있었으며, 이를 통해 흐름영역에 따른 기체체류량을 정확하게 예측할 수 있었다. Molten salt oxidation is one of the most promising alternatives to incineration that can be used to efficiently destroy the organic components of mixed wastes and hazardous wastes. In this study, the gas holdup and gas-liquid flow characteristics are investigated in the molten salt oxidation reactor (0.076 m D×0.653 m H.). Effects of input air velocity (0.05-0.22m/s ) and molten salt temperature (870-970℃) on the gas holdup and flow characteristics have been studied. Molten carbonate as the liquid phase and air as the gas phase have been used in this study. The gas holdup increases with increasing molten salt temperature due to the decrease of viscosity and surface tension of molten carbonate. The experimentally obtained gas holdups in the molten salt reactor have been well described and characterized by means of drift-flux model. The gas holdups with variation of the flow regime have been well predicted.