혈액 투석 환자에서 중심정맥 협착에 대한 스텐트 삽입술 : Wallstent Placement

임대승,노상필,이유선,정승현,김보영,이정우,강정아,김정희,이민수,정준용,최시완,정진옥,성인환,이강욱,신영태 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1

Stenosis of central vein is a common complication arising after percutaneous subclavian vein catheter insertion performed for temporary vascular access in chronic renal failure patients undergoing hemodialysis. There are several treatment methods for the condition like percutaneous angioplasty(PTA), stent insertion, and surgery, but recent trend is toward PTA and stents. Among the patients diagnosed with chronic renal failure from March 1993 to May 2002 and undergoing hemodialysis through AV fistula, the 14 Patients in whom central vein stenosis arose were selected for the study. A total of 28 percutaneous interventions(5 PTA and 23 stent placement) were performed, and restenosis rate and the time taken till the restenosis in de novo lesions and instant lesions were compared. All 28 cases were operated successfully. The 14 cases that received both anigioplasty and stent placement initially. (de novo lesion : 14 cases), Among the 10 cases with de novo lesion that followed up more than 1 year, 3 cases are currently undergoing hemodialysis without restenosis, and the remaining 7 cases have recurred stenosis with the mean time to restenosis of 10.9 months. In the 7 cases in whom stenosis recurred, 11 interventions were done(instent lesion: 11 cases). 4 of these were using only ballon angioplasty with 100% restenosis rate and the mean time of 3 months until restenosis. The remaining 7 cases were using both balloon angioplasty and stent placement, also with 100% restenosis rate but with the mean time of 12 months until restenosis, which was later than the group receiving only balloon angioplasty. In treating the patients with central vein stenosis, stent placement seems to be more advantageous over PTA in terms of restenosis rate and the mean duration of patency. In the case of instent lesion, inserting the stent for the second time after stenosis recurred lengthened the duration of patency compared to performing balloon angioplasty alone.

요배부 수술 실패 증후군에서 자기공명영상의 이용

이준규,안재성,권순태,김환정,정제택 충남대학교 의과대학 지역사회의학연구소 1997 충남의대잡지 Vol.24 No.2

This study was compared pre-operative MRI finding with operative finding on 36 cases with the failed back surgery syndrome (FBSS) retrospectively. The purpose of this study was to determine the accuracy of the MRI on the FBSS including early complications such as hematoma of infection. Of the 51 patients with FBSS, we analyzed pre-operative MRI finding compared with operative finding on 36 cases excluding nonunion, instability, metal failure and pseudoarthrosis who underwent an operation for the FBSS from December 1994 to June 1997. There were 25 men (69.4%) and 11 women (30.6%), aged from 16 to 68 years (average 43.6 years). These were divided into 5 sub-groups and calculated sensitivity, specificity and positive predictability. MRI accuracy in recurred disc was 84%, scar adhesion, recurred or developed stenosis, infection and hematoma 100% each and all, overall accuracy of the MRI 93%, respectively. Average interval of re-operation in FBSS WAS 4.3 years. In the 18 cases (50%), symptoms persist without pain-free interval after first operation. Early complications including hematoma and infection are easily detected with MRI. Especially if patient complains of severe leg pain or neurologic deficit, it is a good diagnostic procedure to check the MRI. The MRI is a useful method for evaluation of most cases of the FBSS, but it has limitations to evaluate recurred disc or scar adhesion only in T1, T2 weighted image. Therefore Gd-DTPA enhancement is necessary for the accurate diagnosis.

VOD 서비스에서의 새로운 스트림 할당 기법

이준화,김영환,박재현,박현민,최병석 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-

Generally, in a VOD(Video On Demand) systems, batching technique is often used to improve throughput. Since subscribers to VOD services tend to renege their requests as the latency becomes large, an optimal stream allocation scheme should consider not only batching size but also renege rate, service latency and fairness between different programs. In this paper, we propose a new stream allocation scheme, which shows improvement in fairness and reduction in renege rate and service latency compared with other well known schemes. When 2 or more streams are available in the VOD server, each streams are allocated based on different program selection policies. Using this approach effectiveness of stream usage can be improved.

심초음파로 결정된 응급 심낭천자술의 천자부위

김성환,황성오,이강현,조준휘,강구현,문중범,이승환,윤정한,최경훈,김영식 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3

Background: The aim of this study was to determine whether the conventional subcostal approach is suitable for emergency pericardiocentesis in patients with cardiac tamponade or impending cardiac tamponade. Methods: This study was a prospective, observational study conducted at the emergency department of a tertiary hospital, Patients who had symptomatic pericardial effusion and who needed emergency pericardiocentesis in the emergency department were included in this study. We measured the epicardium-to-pericardium distance at the subcostal, parasternal, and apical area with two-dimensional echocardiography to determine the appropriate puncture site for pericardiocentesis. An epicardium-to-pericardium distance of more than 1.0 cm was considered as the primary safety factor in determining the Puncture site for pericardiocentesis. The skin-to-pericardium distance was considered as secondary safety factor. Results: Ninety-five consecutive patients(55 males and 40 females; total mean age: 53 year old) with cardiac tamponade or impending cardiac tamponade were enrolled in this study. The puncture site for pericardiocentesis, as determined by echocardiography, was the subcostal area in 43 patients(45%), the apical area in 40 patients(42%), the left parasternal area In 11 patients(12%), and the right parastemal area in one patient(1%). Pericardiocentesis failed in 2 patients(2%) with the subcostal approach and in one patient(1%) with the apical approach. The average epicardium-to-pericardium distance was 31 ±21 mm in patients with the subcostal approach and 21±8 mm in patients with other approaches. There were no differences in the amount of pericardial fluid and in the intraperical pressure among patient groups according to puncture site. There were two procedure related complications: a puncture of the right ventricle with the subcostal approach and a ventricular tachycardia with the apical approach.

태국 깐짜나부리지역의 다크투어리즘 역사경관 활용에 대한 연구 -콰이강의 헬파이어패스와 연합군 묘지를 중심으로-

오일환,윤병국,이준태 한국사진지리학회 2017 한국사진지리학회지 Vol.27 No.3

본 연구는 역사적 장소를 직접 방문하여 새로운 교훈을 얻는 다크투어리즘 관점에서 전쟁의 참상과 잔혹한 현장이었던 깐짜나부리지역을 중심으로 전쟁유산의 역사경관과 관광자원의 구성요소에 대하여 살펴보았다. 첫째, 태국은 고대 왕조의 역사도시 유적지 그리고 자연생태환경 원시림 등의 세계유산이 있다. 이와 함께 방콕의 왕궁유산을 중심으로 짜오프라야강의 근대 개항지를 재현하고 있으며 현지 주민의 운하생활 모습 그리고 해변을 활용한 휴양지 등이 주요한 관광자원이다. 둘째, 깐짜나부리는 제2차 세계대전 기간에 태국과 미얀마를 연결하는 죽음의 철도공사 지역으로 대표적인 다크투어리즘 장소이다. 연합군 포로들의 유품을 전시하는 제스전쟁박물관 그리고 철도공사강제노역장소인 헬파이어패스와 이를 추모하는 기념박물관을 비롯하여 연합군 포로 희생자 묘역인 던락묘지와 청까이묘지 등이 있다. 셋째, 이러한 역사문화도시와 자연환경유산은 콰이강의 다리라는 영화적 유희요소 뿐 아니라 죽음의 철도와 연합군 묘지의 서사적 스토리텔링을 전쟁유산과 태국고유의 관광자원과 결합하여 관광상품으로 활용하고 있다. 그리고 세계 여러 국가 명칭을 도로이름으로 활용하고 빛과 소리 축제와 결합하면서 국제적인 다크투어리즘 유산으로 확장하고 있다. The purpose of this study is to examine components of tourism and recreation that which use of war heritage that are scattered in the Kanchanaburi region as new tourist attractions. It may have been a tragic place of many wars. However, as dark tourism attractions, it can attract much interest as a new learning tour to visit these historical places. First, Thailand’s World Heritage Site actively utilizes archaeological remains of historical city ruins of ancient dynasties and the natural ecological environment of primeval forest as tourism resources. Second, the Kanchanaburi region uses the war heritage of the Death Railway, which connects the Thai and Myanmar(Burma) during the Second World War, as dark tourism. The Jeath War Museum, which displays and reproduces the lifestyle and relics of Allied prisoners, and the Hellfire Pass and Museum with the name of Hellfire as a torch work, as well as the Kanchanaburi War Cemetery and the Chung Kai War Cemetery. Third, these war heritage combines the light and sound festival with commercialization of the film factor of the bridge of the River Kwai and the railroad of death. In addition, the names of cities in the world are given as the names of roads in the city, and waterfalls of national parks and the natural ecological environment are merged and utilized as international dark tourism elements.

중성자에 조사된 원자로 압력용기 재료(SA508)의 Magneto-acoustic emission 효과

홍준화,박덕근,옥치일,김장환,이종규 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70 ℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 미세경도 변화와 magneto-acoustic emission(MAE) 에너지를 측정하였다. 중성자 조사에 따른 경도의 변화는 조사량이 10 /㎠까지는 거의 일정하였으나, 조사량이 10 /㎠이상에서 급격히 증가하였다. MAE 에너지의 변화는 중성자 조사량에 따라 경도의 변화와 같은 형태로 변하였으나 그 변화량은 감소하여 그변화의 추이는 경도의 변화와는 역의 형태였고, 또한 MAE에너지의 상대적 변화와 경도 변화사이에는 아주 좋은 선형성을 보였다. 이러한 결과에서 SA508 강재는 10 /㎠이상의 중성자에 조사될 경우에 재료에 중성자 조사에 의한 미세 결함이 급격히 증가하여 전위(dislocation)이동에 대한 저항성을 나타내는 마찰경화의 증가가 경도의 증가를 유발하고, 또한 이러한 미세 결함은 자기장과의 반응에서는 90°자벽의 운동중에 자기탄성 변화를 유도하여 MAE 에너지의 감소를 유발함을 알 수 있었다. 그리고 경도의 변화량보다 MAE 에너지의 변화량이 더 크게 나타나, 중성자 조사에 의한 미세결함은 기계적 성질보다 자기적 성질에 더 민감하게 반응한다는 것을 알 수 있었다.따라서 MAE가 중성자 조사에 의한 재료의 미세 구조 결함을 비파괴적인 방법으로 평가하는 강력한 도구의 가능성이 있음을 알 수 있었다. Magneto-acoustic emission (MAE) energy and hardness were measured in the reactor pressure vessel steel (SA508 Steel) for the various neutron fluence, irradiated dose up to 10 n/㎠. The hardness was nearly a constant up to 10 n/㎠, but it was rapidly increased with an increase of the neutron irradiation above 10 n/㎠. It may be considered that the increase of hardness is due to the hindrance of dislocation motion induced defect clusters by irradiation. On the other hand, the MAE energy was slowly decreased as the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation above 10 n/㎠. The decrease of the MAE energy may be considered as an increase of the defect clusters which is very sensitive to the 90°domain wall motion. Furthermore, the change of MAe energy and hardness had nearly a linear relationship, but the change of MAE energy was more significant than the change of the hardness. Therefore, MAe may be considered as a very useful technique for the nondestructive evaluation of irradiation damage.

베트남 다크투어리즘 유산의 현황과 활용에 관한 연구

오일환,윤병국,이준태 한국사진지리학회 2017 한국사진지리학회지 Vol.27 No.2

본 논문은 베트남 다크투어리즘 유산의 현황과 활용에 관한 연구를 목적으로 호치민 중심의 남부권역에 대한 전쟁유산의 구성요소와 양상을 고찰하였다. 베트남 다크투어리즘의 전쟁유산으로 하노이 중심의 북부지역은 전쟁의 승자와 패배자의 정치적 개념으로 상징화하면서 자연유산과 결합하고 있다. 중부지역은 후에, 미선 그리고 호이안의 전통문화유산과 DMZ지역의 전쟁유산을 접목하면서 다낭해변의 관광요소를 활용하고 있다. 호치민시를 중심으로 한 남부권역은 프랑스와의 독립항전과 미국에 대한 반전유적지 그리고 혁명유적지로서의 전쟁유산뿐 아니라 맹그로브 숲과 해변휴양관광을 결합하면서 메콩델타지역의 정치 경제적 중심공간으로 상징화하고 있다. 베트남 다크투어리즘의 전쟁유산은 역사 문화적 지역성이 투영된 장소적 진정성과 전쟁유산을 재현하고 기억하는 공간의 기념성을 융합하면서 중요한 관광요소로 활용하고 있다. 이와 함께 외세에 대한 저항정신과 항전으로 쟁취한 독립에 대한 자부심과 애국심을 확립하는 정신적 가치의 전쟁유산으로 활용하고 있다. The purpose of this study is to investigate the components and aspects of war heritage in the southern part of Vietnam, focusing on the present situation and usage of Vietnam`s Dark Tourism. In the northen region, the war heritage of Vietnam Dark Tourism is combined with the natural heritage symbolizing the political concepts of the winner and loser of the war. The central region uses coastal tourism elements with the traditional historical culture of the dynasty and the war heritage in the DMZ area. The southern region around Ho Chi Minh is represented as the united central space of the Mekong Delta, integrating the mangrove forest with the beach recreational tourism as well as the war heritage and anti-war relics as a revolutionary site that was against France for independence and against America by Vietnam war. Vietnam`s Dark tourism is an important tourism resource since it combines the regional authenticity of the historical and cultural aspects with the spatial memorial that recreates and reminds the war heritage. It is also used as a patriotic tourism resource that establishes self-esteem and nationalism for the independence against foreign countries by physical and spiritual resistance.

니트섬유강화 복합재료의 기계적 성질에 관한 연구

한길영,이동기,최병기,오환교,신용욱,전수영 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

Using conventional textile techniques such as weaving, braiding, knitting and stitching it is possible to produce a wide range two and three dimensional fiber preforms. However, so far only a limited attention has been given to knitted fabrics in composite industry. This is mainly due to the opinion that knitted fabric reinforced composites posses low mechanical properties owing to their looped fiber architecture. But it is possible to obtain desired mechanical properties by selecting proper knitted fabric structure. In this paper, tensile failure load and displacement of one yarn, four yarns and knitted fabrics of ten yarns of kevlar fiber were determined experimentally in the unidirection. Mechanical properties of plain weft knitted fabrics reinforced composite intrusion beam for car side door application were investigated experimentally, which compared with desire value of American Fedral Motor vehicles Safety Standard (FMVSS) and presented the results.

중성자에 조사된 원자로 압력용기 재료의 Barkhausen 노이즈에 관한 연구

옥치일,김장환,박덕근,홍준화,이종규 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 자기이력곡선과 Barkhausen noise amplitude(BNA), Barkhausen noise energy(BNE) 및 미세경도 변화를 측정하여 이들 사이의 상관관계를 구하였다. 중성자 조사에 의하여 자기이력곡선은 변화가 없었으며, BNA, BNE 및 경도는 중성자 조사량에 따라 세 단계의 변화를 보였으며, 중성자 조사량이 10 n/㎠에서는 급격히 변하여 이들 사이의 상관관계가 있음을 알 수 있었다. 따라서 BNA와 BNE가 중성자 조사에 의한 재료의 미세 구조 결함을 조사하는데 비파괴적인 방법으로 가능성이 있음을 알 수 있었다. Hysteresis loop, Barkhausen noise(BN), and hardness were measured in the neutron irradiated RPV steel for various fluence, irradiated dose up to 10 n/㎠. The coercivity, remanence and maximum induction of neutron irradiated samples did not change significantly, but the BNA and BNE were decreased as the neutron irradiation increased. The changes of BNE and BNA were characterized by three stages with respect to neutron dose. The BNA and BNE were decreased with an increase of neutron dose to 10 n/㎠, and remained nearly constant up to 10 n/㎠, then were decreased rapidly with an increase of the neutron dose above 10 n/㎠. On the other hand, the hardness was observed revesely with the change of BNA and BNE.

병식 평가 척도-한국판(SUMD-K)의 신뢰도와 타당도 검증

송지영,김기태,이서경,김용희,노준호,김종우,장환일,반건호,강원섭 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.4

Objectives : This study was conducted to evaluate the reliability and the validity of the Korean version of the Scale to Assessment Unawareness of Mental Disorder (SUMD-K). Methods : The subjects were 55 schizophrenic patients between ages of 26 and 58 who were recruited from the psychiatric unit of the university hospital and the out-patient clinic. The SUMD-K and insight scale of PANSS were applied to the patients. Results : The range of inter-rater (Spearman's rho) of the general items of SUMD-K were .97-.98 on the current illness and .58-.98 on the past illness. The correlation coefficient between the sum and the general items of the SUMD-K showed high scores. The concurrent validity between SUMD-K and insight item of PANSS was high (scores between .59-.96). However,the reliability and the validity of the attribution items of symptoms showed low scores compared to the current symptoms. Conclusion : The SUMD-K was confirmed in its reliability and validity. It can be a useful clinician-rating scale for evaluating insight in schizophrenic patients as well as patients with other neuropsychiatric conditions.