췌장 선방세포암 1예

이화정,지준호,박승찬,박정철,최은정,서혜진,이원식,이정림,배병조,손경락,이경희 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Acinar cell carcinoma is a rare tumor that represents 1~2% of al1 pancreatic cancers. Clinical and radiologic findings are inconclusive in this disease Acinar cell carcinoma is characterized by rapid progression and early metastasis, which lead to its poor prognosis. A 41-year-o1d man was admitted to our hospital for abdominal pain. Abdominal computed tomography (CT) and positron emission tomography-computed tomography (PET-CT) showed a splenic mass, which was being invaded by a pancreatic tail mass and which had increased ^(18)F-fluorodeoxyglucose (FDG) uptake Primary radical distal pancreatectomy and splenectomy were performed. Pathologic findings revealed an acinar cell carcinoma of the Pancreas The patient underwent a total gastrectomy three months later because of gastric recurrence Four months later, multiple hepatic metastases were discovered, and the patient underwent a left hepatectomy During treatment with capecitabine, there was no evidence of tumor progression for 14 months. We report a case of metastatic pancreatic acinar cell carcinoma, which did not progress for an extended period while the patient was being treated with capecitabme.

원발성 후복막 점액낭샘암종 1예

지준호,이화정,박승찬,박정철,최은정,서혜진,이원식,이정림,배병조,손경락,이경희 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Primary retroperitoneal mucinous cystadenocarcinoma is a very rare malignancy, and little is known concerning its Pathogenesis, optimal treatment, and prognosis. A 29-year-o1d pregnant woman (21 weeks) Presented with abdominal discomfort CA 19-9, CA 125, and CEA were normal Abdominal CT scanning revealed a 19x15x13 cm retropentoneal tumor Exploratory laparotomy and tumor excision were performed. Mucinous retropentoneal implants were removed as completely as possible Histologically, the tumor showed focal areas of capsular invasion, but free resection margins The uterus and both ovaries were normal in appearance No adjuvant therapy was pursued. Six months later, Peritoneal and bilateral ovarian metastases were discovered. Hence, we report the details of this case of primary retroperitoneal mucinous Cystadeno-carcinoma and present a review of the literature.

Azathioprine에 반응을 보인 류마티양 관절염에 의한 경막염(Pachymeningitis)1예

배광봉,이정호,이정찬,곽상혁,강정현,김철희,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Rheumatoid arthritis frequently involves the cervical spine and may lead to neurologic impairement. However, direct involvement of CNS structures by inflammatory cells has been reported infrequently. The prevalence of this complication of rheumatoid arthritis is unknown. Inflammatory CNS involvement in rheumatoid arthritis reportedly occurs in the setting of longstanding, active, erosive articular disease and is accompanied by extracranial and extraspinal nodules and vasculitis. This is diagnosed by radiologic finding of CNS nodules or meningeal thickening and by biopsy or autopsy. Treatment with corticosteroid, cytotoxic agent or surgical decompression is helpful. But the majority of patients die within several months of onset of neurologic symptom. Recently, we experienced a case of pachymeningitis caused by rheumatoid arthritis, which resolved repeatedly with azathioprine treatment.

구강악안면외과로 대진의뢰되어 치료받은 안면골 골절환자에 대한 연구

정찬,배정수,김준배 東國大學校醫學硏究所 1994 東國醫學 Vol.2 No.-

문명의 발달, 인구의 증가 및 스포츠의 대중화로 인하여 교통사고, 산업재해, 상해, 및 스포츠로 인한 외상이 증가하고 있으며 손상의 양상도 보다 다발성이며 심각한 양상을 보이는 경우가 많아지게 되었다. 악안면부위에 외상을 가지는 경우, 신경외과나 정형외과적 영역의 손상을 동반하는 경우가 흔하며 이들 타과와의 협조하에 환자치료에 임하게 되는 경우가 많아지고 있다. 본 연구는 1991년 3월부터 1994년 2월까지 동국대학 부속병원 구강악안면외과에서 치료받은 214명의 안면골 골절 환자중 타과에서 대진의뢰를 받아 치료를 시행한 49명을 대상으로 방사선 사진과 의무기록 확인을 통하여 다음과 같은 결론을 얻었다. 1. 전체 안면골 골절환자중 타과에서 대진의뢰된 환자는 23%였으며, 남자 대 여자의 비율은 4.4:1로 남자에서 호발하였다. 2. 연령별로 보면, 20대(37%)와 30대(29%)에서 호발하였다. 3. 관골부(53%), 하악골(47%), 상악골(22%), 안와골(14%), 비골(8%)의 순으로 골절이 발생하였다. 4. 교통사고(76%)가 압도적인 손상의 주요원인이었다. 5. 신경외과(78%)에서 가장 많은 환자를 안면골 골절로 대진의뢰하였다. 6. 대진의뢰하는데 소요되는 기간은 1일이 69%, 2∼3일이 25%로 3일 이내에 대부분 처리되었다. 7. 비관혈적 정복술만으로 치료한 경우(4%)보다 비관혈적 정복술이 동반되거나 혹은 관혈적 정복술 만을 시행한 경우(86%)가 많았으며, 관혈적정복술은 소형금속판이나 강선을 이용하였다. 8. 1주일 이내에 80%의 환자가 골절에 대한 처치를 시행받았다. 9. 감염, 부정교합, 개구장애, 악관절 동통 등의 합병증이 24%로 일반적 안면골 골절환자에 비하여 비교적 높은 비율로 발생하였다. 안면골 골절시 치유경과 및 회복은 골절이 정도 및 양상, 환자의 연령, 타부위 연관손상 등에 의하여 많은 영향을 받게 되므로, 고도의 의료기술을 활용한 타과와의 신속하고 긴밀한 유기적 협조체체와 술후의 지속적, 주기적인 임상검사 및 연구가 요할 것으로 사료된다. This is a retrospective study on 49 facial bone fracture patients consulted to Department of Oral and Maxillofacial Surgery from March 1991 to February 1994. The obtained results were as follows. 1. Of the 214 patients with facial bone fractures, 49 patients(23%) were consulted and male to female ratio was 4.4:1. 2. The age frequency was the highest in the 3rd decade(37%)and then 4th decade(29%). 3. The zygomatic area(53%) was the most frequent site and then mandible(47%), maxilla(22%), orbit(14%) and nasal bone(8%). 4. Traffic accident was the most frequent cause(76%). 5. Seventy eight percent of the patients were consulted from neurosurgery. 6. The durations form trauma to consult were largely within 3 days(94%). 7. The open reductions(86%) were more frequent than the closed reductions(4%) when surgical treatments were performed. 8. The duration from trauma to operation were within 1 week, in 80%. 9. The complications in consulted patients were more frequent(24%) than other general facial bone fractures.

GMAHN 환경에 적응하는 에러 복구기능을 이용한 AODV 라우팅 프로토콜

정찬혁,오세덕,배진승,이기원,장양근,이광배,김현욱,유충렬,하재승 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-

Mobile nodes in ad hoc mobile networks typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper proposes a solution that allows mobile nodes to access the wired Internet and to roam from base station to base station. And we also develop the efficient method that adapts in Global MANET which can be changed over time. It is observed that we can reduce not only error detection time but also network load, thus increasing the data reception rate in Global MANET Environment.

네트워크 식별자 기반 파일 공유 오버레이 네트워크

배일호,이정기,박찬모,이호영,정성옥,이준 朝鮮大學校 電子情報通信硏究所 2003 電子情報通信硏究所論文誌 Vol.6 No.2

근 수 년간 클라이언트/서버 모델에서 발생하는 문제인 서버 병목 현상, DoS (Denial of Service) 공격, 그리고 시스템의 확장성에 따르는 비용 증가 등의 문제를 해결하기 위한 방법으로 P2P (Peer to Peer) 방식이 활발히 연구되고 있다. P2P 방식을 사용하는 모델은 기존의 클라이언트/서버 모델이 적용되었던 여러 분야에 이용되고 있다. 그 중 사용자간 파일 공유하는 분야에 적용된 P2P가 가장 널리 알려져 있다. P2P 파일 공유 네트워크에서 가장 중요한 이슈는 검색의 효율성이다. 검색의 효율성을 위해 제안된 가장 효과적인 접근법으로는 DHT(Distributed Hash Table)을 사용한 검색 기법이다. 이 방식에서 메시지 라우팅은 정보의 검색과 분산을 위해 사용되고, 메시지 라우팅 성능은 라우팅 Hop 수에 의해 결정된다. 그러나 기존의 접근법에서는 라우팅 Hop 수를 감소시키는 능력이 부족하다. 이를 해결하기 위해 본 연구에서는 네트워크 식별자와 노드의 그룹화에 의해 메시지 라우팅 성능을 개선하기 위한, DHT를 사용한 P2P 파일 공유 네트워크를 제안한다. 노드의 그룹화는 메시지 라우팅 Hop을 감소시키고, 한 노드 내에 많은 노드를 나타내어 확장성을 갖고 있다고 할 수 있다. 실험에는 네트워크 시뮬레이터를 사용하여 증가된 확장성과 성능의 개선을 보였다.

MANET 라우팅 프로토콜 QoS 지원서비스의 성능평가에 관한 연구

鄭燦赫,金鉉郁,李光培,姜景仁,朴京培,劉忠烈,吳世德,裵振勝,趙榮泰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In this paper, we evaluated two main QoS supporting routing protocol on wireless ad hoc network. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS support service between source and destination becoming a very important issue. Of all routing protocols, DSR and AODV are very important routing protocol in MANET. So we simulated DSR and AODV QoS Routing Protocol Through simulation evaluation tool NS(Network Simulation) based on various environments.

이동 애드 혹 네트워크에서의 환경적응형 QoS AODV 라우팅 프로토콜에 관한 연구

裵振勝,宋東勳,吳世德,鄭燦赫,金玄郁,李光培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance vector routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end points is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average data reception rate. At that time, we used evaluation parameters such as node's mobility-stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.293%, 15.914%, 17.238% for 300 mobility-stop second case and 4.809%, 4.264%, 2.956% for 300 mobility-stop second case.

rudder 곡판 절단선에 관한 연구

정형배,김재중,김찬석 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This paper suggests a method about how to get the NC code of intersection curve of rudder free form surface automatically. Suggested method uses NURBS interpolation and intersection in order to get the data of cutting lines and converts them in AutoLISP format to visualize in AutoCAD. This method has been tested by application in real rudder and shown the reliable results.

철근콘크리트 전단벽체의 형식에 따른 구조성능 평가

全燦穆,權重培,申鍾學,河基柱 慶一大學校 1996 論文集 Vol.13 No.2

In this study, nine reinforced concrete infilled frames involved bare frames were tested during vertical and cyclic loads simultaneously. This test programs were carried to investigate the horizontal strength and the crack propagation in variance with hoop reinforcement ratio. All specimens were modeling in one-third scale size. In this experimental program structural performance of reinforced concrete shear wall were focus at connection types. Based on the test results, the following conclusions are made. (1) In fully rigid frame, increasing the ratio of hoop bar 2∼3 times on the basis of its ratio of in column(p??=0.196%). The horizontal strength of specimen did not varied, but the increased ductility of specimens were showed greatly at the final failure. (2) In the boundary column menber of reinforced concrete shear wall, increasing the ratio of hoop bar in two or three times, in the fully babel type, the shear and horizontal strength of specimens were increased 1.1-1.2 times than that of fully rigid frame. And infilled shear wall specimen were increased 1.17-1.27 times than that. (3) Fully rigid babel type shear wall specimens were increased 5.7∼8.0 times, and infilled shear wall specimens were increased about 4.0∼5.6 times in comparision with the full rigid frame.