Iliac Artery Occlusive Disease: Endovascular Treatment

도영수 대한외과학회 2003 대한외과학회 학술대회 초록집 Vol.2003 No.11

고정밀도의 뇌파측정시스템 개발 연구

도영수,장호경,한병국 한국의학물리학회 2002 의학물리 Vol.13 No.3

In this study, we attempted in preparing high precision EEG measuring equipment. To measure EEG in high efficiency, pre-amplifier should get high performance common mode rejection ratio. Also, separation amplifier is essential to eliminate common line noise. So, our study were pointed at elevating the efficiency of eliminating noise, user safety and low noise characteristics. Prepared high precision pre-amplifier for EEG was A/D converted to automatically classify $\alpha$ wave, $\beta$ wave and $\theta$ wave. And converted data were Fast Fourier Transformed with real time DSP (Digital Signal Processing). Clinical demonstrations were carried out with healthy students, aged between 20 to 26 who has no histories of illness. To recognize the efficiency of the EEG, prepared EEG were used with MS equipment in low stimulated state and high stimulated state. Then, we studied at the effect of sensitivity on brain wave. From this study, it is known that our EEG equipment is efficient in sensitivity evaluation and suitable stimulations for each psychological state are required. 본 연구에서는 뇌파 신호를 측정할 수 있는 고정밀도의 뇌파측정시스템을 제작하였다. 전치증폭기는 분리증폭기의 방식으로 잡음제거 능력을 향상하였으며, 높은 사용자 안전도를 갖도록 제작하였다. 제작된 뇌파측정시스템은 주파수 대역별로 알파, 베타, 세타로 자동으로 분류될 수 있도록 A/D 변환하였다. 변환된 데이터는 DSP를 이용하여 실시간으로 FFT처리를 하였다. 실험은 현재 병력이 없고 건강 상태가 양호한 만 20세에서 26세까지의 학생을 대상으로 실시하였다. 외부의 물리적인 자극이 뇌파에 미치는 영향을 조사하기 위하여, 현재 시판되고 있는 뇌파 자극기인 MS제품을 이용하여 시각과 청각의 두 상태로 외부자극을 주고, 그 반응을 측정하여 비교하였다. 피검자의 감성평가 측정결과 본 연구에서 제작한 뇌파측정기가 유효함을 확인하였으며, 심리적인 상태변화를 조사할 수 있었다.

가공방법에 따른 소형 도광판용 광학패턴 금형의 표면특성연구

도영수,김종선,고영배,김종덕,윤경환,황철진,Do, Young-Soo,Kim, Jong-Sun,Go, Young-Bae,Kim, Jong Duck,Yoon, Kyung-Hwan,Hwang, Chul-Jin 한국금형공학회 2008 한국금형공학회지 Vol.2 No.4

Micro pattern is applied to the light guiding plate(LGP) to enhance the uniformity of the brightness of the LCD. The micro cones are molded in intaglio on the surface of the LGP. The surface roughness of each cone was 40nm and 38nm in negative and positive die for laser ablation. In chemical etching, the surface roughness was 25nm, 24nm in negative and positive. And the surface roughness of negative and positive dies were 4nm and 5nm for LIGA-reflow process.

기관 및 기관지 결핵의 CT 소견

도영수 대한영상의학회 1990 대한영상의학회지 Vol.26 No.2

Tracheobronchial tuberculosis is the tuberculous affection of tracheobronchial wall mainly due to direct implantation of infected sputum through airway. When inflammation extends deeply into the bronchial mucosa, causing ulceration and necrosis, healing can occur with fibrosis and result in bronchial stenosis. There have been many reports of simple chest findings and bronchographic findings about trachebronchial tuberculosis. But there is no report about CT findings of tracheobronchial tuberculosis. We reviewed and analysed CT findings of 15 cases of tracheobronchial tuberculosis which were examined during the period form January 1987 to August 1989. The diagnosis was based on bronchoscopic biopsy (5), positive sputum, AFB (5), or previous antituberculous medication with typical bronchoscopic finding (5). All 15 patients were studied with a GE-9800 scanner after injection of intravenous contrast media injection. The results were as follows. 1. Of the 15 cases, 13 cases were fe ale and 2 cases were male. Most patients were female in their twenties or thirties. 2. The CT findings of endobronchial lesion are luminal obstuction in 6, increased wall thickness in 9, walll enhancement in 2, surrounding fat plane obliteration in their twenties or thirties. 3. CT CT and bronchoscopy, equally detected bronchial lesions in 8 cases. CT was superior in 4 cases and bronchoscopy was superior in 2 cases. 4. The most frequently affected site was left main bronchus 98), followed by trachea (4), right main bronchus (4), right bronchus intermedius (4), RUL bronchus (3), LUL bronchus (3), LLL bronchus (3), RML bronchus (1), RLL bronchus (1). 5. There were 8 cases of surrounding lymphadenopathy and 7 cases of surrounding calcified lymph node. Mainly right paratracheal and tracheobronchial lymph node enlargement were observed. 6. The findings of parenchymal lesion were ill-defined nodule in 10, ateletasis in 9, bronchiectasis in 8, emphysema in 7, consolidation in 5 and cavity i 2, No parenchmal leison observed in 1 cases. Tracheobronchial stenosis, involving concentrically and long segment, in a relatively young female patient without visible mass around the stenotic segment are the typical findings of tracheobronchial tuberculosis.

동절기의 융빙제들의 융빙 성능 및 영향 평가

도영수,이병덕,최광수,김광우 한국도로학회 2008 한국도로학회논문집 Vol.10 No.3

This study was estimated on performance of deicers, corrosion inhibitors and low corrodible deicer used for removal of snow or ice on the road and on influence on structure. The weight loss rate after freezing and thawing of low corrodible deicer is lower than one of deicer, corrosion inhibitors and these combination. Relative dynamic elastic modulus of all except water, low corrodible deicer and NaCl+JF-1004 was radically reduced after freezing and thawing 150 cycles. And concretes after freezing and thawing were showed severe surface damage. It was found that individual use of low corrodible deicer and corrosion inhibitors had a problem of field application because of lack of early ice melting effect and considerably low durability. Products combined with NaCl was showed rapid weight loss by metal corrosion. Therefore, It will need to circumspectly select combination of deicers having low effect on concrete pavement and bridge if possible. This study was estimated on performance of deicers, corrosion inhibitors and low corrodible deicer used for removal of snow or ice on the road and on influence on structure. The weight loss rate after freezing and thawing of low corrodible deicer is lower than one of deicer, corrosion inhibitors and these combination. Relative dynamic elastic modulus of all except water, low corrodible deicer and NaCl+JF-1004 was radically reduced after freezing and thawing 150 cycles. And concretes after freezing and thawing were showed severe surface damage. It was found that individual use of low corrodible deicer and corrosion inhibitors had a problem of field application because of lack of early ice melting effect and considerably low durability. Products combined with NaCl was showed rapid weight loss by metal corrosion. Therefore, It will need to circumspectly select combination of deicers having low effect on concrete pavement and bridge if possible.

CRM 개질아스팔트 혼합물의 소성변형 및 박리저항 특성

도영수,박태원,김현환,김광우 한국도로학회 2007 한국도로학회논문집 Vol.9 No.4

Evaluation of the asphalt mixture modified with crumb rubber modifier (CRM) was performed to estimate possibility of using it as a paving material. OACs (optimum asphalt content) of CRM modified asphalt mixtures by dry process and wet process were determined by Marshall mix design and Wheel tracking test and moisture susceptibility test by freezing and thawing were carried out with CRM modified asphalt mixtures at OACs. The results from these tests, resistance of permanent deformation of CRM modified asphalt mixtures were superior to one of AP-5 while showing very low resistance of moisture sensitivity by freezing and thawing. This means that CRM modified asphalt mixtures are very sensitive to freezing and thawing. However, CRM modified asphalt mixture with anti-stripping material showed high improvement to resistance of moisture susceptibility by freezing and thawing. Therefore, it is recommended that when CRM mixtures were used in domestic, CRM modified asphalt mixtures should be with prevention against freezing and thawing resistance by moisture susceptibility.

복합전도성 필러의 전자파 차폐특성 연구

도영수,장호경 慶山大學校 基礎科學硏究所 2002 基礎科學 Vol.6 No.1

본 연구에서는 전도성이 우수하며 대량생산이 가능한 전도성 필러를 무전해 도금법을 이용하여 제조하였다. 전도성 필러의 코어재료는 어스펙트 비를 달리한 나일론 6과 레이온이 사용되었으며, 표면에 전도성을 부여하기 위한 재료로는 니켈과 구리가 사용되었다. ABS수지에 혼합되어 분산된 전도성 필러의 표면 특성은 전자현미경으로 관찰하였다. 전자파 차폐특성은 동축 전송선형 측정기구를 이용하여 디스크 형태로 절단한 필림을 삽입시켜, 1 ㎒ ∼ 1 ㎓ 대역에서 입사된 전자파와 출사된 전자파의 비로 차폐효율을 측정하였다. A series of conductive filler were prepared with electroless plating method. Base conductive materials of the fillers were nickel and copper. The cores were prepared with Nylon 6 and rayon in different aspect ratio. Also, various complexes were made with ABS resin and conductive filler with different feed ratio (5wt %, 10wt%). The surface characteristics of conductive filler were examined with scanning electron microscopy. Electromagnetic wave shielding efficiency of each complex film was measured with flanged circular coaxial transmission line sample holder within the 1 ㎒ ∼ 1 ㎓ bandwidth range.

반사균열 억제를 위한 그리드 사용 포장의 현장 상태 평가

도영수,조병진,박태원,김광우 한국도로학회 2006 한국도로학회 학술대회 발표논문 초록집 Vol.2006 No.10

동정맥기형의 에타놀 색전술: 33예의 치료성적과 합병증

도영수,신성욱,조재민,이민희,이병붕,Do, Yeong-Su,Sin, Seong-Uk,Jo, Jae-Min,Lee, Min-Hui,Lee, Byeong-Bung 대한영상의학회 2003 대한영상의학회지 Vol.49 No.4

목적: 동정맥기형에 대한 에타놀 색전술의 효과와 합병증을 평가하고자 하였다. 대상과 방법: 상지(n=14), 하지(n=10), 골반부(n=7), 흉부(n=1), 복부(n=1)에 동정맥기형을 가진 33명의 환자를 대상으로 145회의 단계적인 에타놀 색전술을 시행하였다. 85회의 경도관 색전술과 60회의 직접천자 색전술이 시행되었으며 7예에서는 확장된 유출정맥에 대한 추가적인 coil 색전술이 행하여졌다. 색전술의 치료효과는 최초 색전술전과 마지막 색전술후의 혈관조영상에서 동정맥기형의 폐색정도로 평가하였다. 색전술 후 발 생한 합병증은 주요 합병증과 경미한 합병증으로 분류하였다. 결과: 13예(39%)에서 동정맥기형이 완전 폐색되었다. 8예(24%)에서 75%이상, 3예(9%)에서 50-75%, 4예(12%)에서 50% 미만으로 폐색되었다. 이전 영양동맥에 대한 외과적 결찰술 또는 coil 색전술로 동정맥기형 핵으로의 접근이 제한된 경우, 피하층에 위치한 동정맥기형, 시술 후 감염 그리고 추적관찰 기간동안 대량출혈이 있었던 5예(15%)에서 실패하였다. 145회의 색전술시 21회(14.5%)에서 일시적 신경마비와 국소적 피부괴사와 같은 경미한 합병증이 발생하였으며 보존적인 치료로 호전되었다. 5회(3.4%)의 주용 합병증으로는 뇌경색, 요로감염, 횡문근융해증에 의한 급성 신부전, 영구적인 정중신경마비, 감염이었다. 결론: 직접천자 또는 경도관 기법을 이용한 에타놀 색전술은 동정맥기형 치료의 효과적인 방법이지만 색전술에 수반되는 상당한 합병증을 해결하기 위해서는 보다 많은 시술 경험이 요구된다. Purpose: To assess the effectiveness of ethanol embolization for the treatment of arteriovenous malformation (AVM), and the complications, if any, arising. Materials and Methods: Thirty-three patients with AVMs underwent 145 staged sessions of ethanol embolization. AVMs were located in an upper extremity (n=14), a lower extremity (n=10), the pelvis (n=7), the thorax (n=1), or the abdomen (n=1). Eighty-five transcatheter embolizations and 60 direct percutaneous puncture embolizations were performed, and seven patients underwent additional coil embolization of the dilated outflow vein. The therapeutic effectiveness of embolization was evaluated in terms of the extent to which an AVM was obliterated between baseline and the final angiogram. Complications were classified as minor or major. Results: In 13 patients (39%), AVMs were totally obliterated. In eitht patients (24%), more than 75% were obliterated; in three (9%), the proportion was 50-75%; and in four (12%), less than 50%. Five patients (15%), were not treated. The reasons for failure were the difficulty of approaching the nidus due to previous surgical ligation or coil embolization of the feeding artery, the subcutaneous location of an AVM, post-procedural infection, and massive bleeding during the follow-up period. Twenty-one minor complications such as focal skin necrosis or transient nerve palsy developed during 145 sessions of (an incidence of 14%), but these were relieved by conservative treatment. The five major complications arising (3%) were cerebral infarction, urinary tract infection, acute renal failure due to rhabdomyolysis, permanent median nerve palsy, and infection. Conclusion: Ethanol embolization by direct percutaneous puncture or using a transcatheter technique is an effective approach to the treatment of an AVM. However, to overcome the considerable number of complications arising, further investigation is required.

간세포암의 조영제 증강전후긔 전산화단층촬영소견의 비교

도영수 대한영상의학회 1988 대한영상의학회지 Vol.24 No.5

We performed this study to evaluated detectability and delineation of extent of hepatocelluar carcinoma be comparison between nonenhanced and contrast-enhanced CT scan During a three-year period 174 patients with hepatocellular carcinomas were examined by CT at Seoul National university Hospital. Fifty-there patients had histological proof by operation or liver biospy while 121 patients were diagnosed by characteristic angiographic finding and elevated a fetoprotein level (>500ng/ml). All 174 patients were studied was a CT-9800 scanner. CT scans wee obtained both before and after ad-ministration of contrast medium. Contrast material was given by bolus injection of 120ml of ioxitalamate meglumine. CT findings were divided into three categories; Good : tumor is noted and extent of tumor is clear-ly defined; Fair : tumor is noted but extent of tumor is not defined; Poor : tumor is not noted. In 165 cases of the tumor on nonenhanced CT scans 131 cases (79%) showed low-density 29 cases (18%) iso-density one case high-density and 4 cases (2.4%) mixed density. In 174 cases of the tumor on contrast-enhanced CT scans 170 cass(97%) showed low-density 3 cases (1.8%) iso-density and 1 cases mixed density (0.6%) in 165 cases of that tumor on nonenhanced CT scans 64 cases (39%) were categorized as good in tumor on contrast-enhanced CT scans Our sesults indicate that contrast-enhanced Ct scans are better than nonenhanced CT scans in detecting the tumor and defining them and reduce radiation exposure to the patients by nonenhanced CT scans in clinically suspected hepatocellular carcinoma.