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간장의 횡격막 탈장에 의한 Budd-Chiari 증후군: 1예 보고
송재민,윤중원,김재욱,정우경,정희선,김주형,최준호,김승호 대한영상의학회 2007 대한영상의학회지 Vol.56 No.1
Budd-Chiari syndrome is an uncommon disorder, and it is caused by obstruction of the hepatic venous outflow or inferior vena cava above the hepatic vein. It may result from a large number of conditions, including primary congenital obstructions of the hepatic veins or inferior vena cava by webs or bands. Secondary causes include trauma, polycythemia vera, chronic leukemia, pregnancy, tumors and use of oral contraceptives. No definitive etiologic factors have been identified in two thirds of all cases (1-3). We recently experienced a case of Budd-Chiari syndrome caused by diaphragmatic hernia in 21-year-old man. Postoperative follow up CT showed normal venous flow after reintroduction of the liver into the abdominal cavity and closure of the diaphragm defect. Budd-Chiari 증후군은 드문 질환으로서 간정맥 또는 하대정맥의 위치에서 간정맥 유출의 폐쇄를 특징으로 하는 여러 질병을 포함하여 통칭하는 질환이다. 원인으로는 일차성으로 막과 밴드에 의한 선천성 간정맥 유출의 폐쇄와 이차성으로 종양에 의한 간정맥 침범 또는 압박, 외상, 임신, 경구 피임제, 만성백혈병 등을 들 수 있으나 최근에 영상학적 진단의 발달에도 서구에서는 아직도 2/3 정도는 원인 미상으로 보고되고 있다(1-3). 임상증상으로 간비대, 복통, 복수 등이 관찰될 수 있으나 항상 관찰되는 것은 아니며 흔히 비특이적 간문맥압 상승, 황달, 정맥류 출혈을 보일 수 있다(1, 2). 저자들은 최근 간장의 횡격막 탈장에 의한 Budd-Chiari 증후군 1예를 경험하였고 이는 국내외적으로 드물게 보고되고 있어 흉부사진과 전산화단층촬영 소견을 보고하는 바이다.
Electrooptical Threshold Behavior of Electroconvection in Twisted Nematic Liquid Crystal Cells
송재민,최규진,곽진석,손영구,허종훈 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.3
In this paper, the electrooptical threshold behavior of electroconvection caused by the electrohydrodynamic instability in twisted nematic liquid crystal cells is presented. We observed the electroconvection optically and analyzed the change in the electrical threshold behavior according to the twisted angles in twisted liquid crystal cells in the conduction region that shows the Williams domain, which is one of the most basic patterns for electroconvection in an anisotropic fluid like liquid crystals (LCs). As a result, we confirmed that in the low frequency conduction regio where the Williams domain appears, the threshold voltage decreased as the twist angle increased even though the twist structure enhanced the effective viscosity in liquid flow. The increase in the twist angle may shorten the charge relaxation time because a twisted LC is a structure that more easily accumulates electrical charges on local curvatures.
유경 횡복직근피판술 후 발생한 부분 피판괴사 및 지방괴사의 넓은등근피판을 이용한 재건 치험례
송재민,양정덕,정기호,정호윤,조병채,이상윤 대한성형외과학회 2009 Archives of Plastic Surgery Vol.36 No.1
Purpose: The transverse rectus abdominis musculocutaneous(TRAM) flap is the most commonly used autogenous tissue flap for breast reconstruction. Postoperatively, partial flap loss or fat necrosis are relatively common and it may result in a smaller breast volume with marked contour irregularities. These defects are not easy to reconstruct with local tissue rearrangement or with breast implants. The current authors present the results of 2 patients who underwent Latissimus dorsi(LD) flap reconstruction to correct partial flap or fat necrosis that developed after TRAM flap breast reconstruction. Methods: Case1: A 50-year-old woman with left breast cancer visited for breast reconstruction after radical mastectomy. Initially, breast reconstruction with pedicled TRAM was performed. Postoperatively partial flap necrosis was developed. Secondary breast reconstruction using LD flap was done. Case2: A 51-year-old woman with left breast cancer visited for breast reconstruction after radical mastectomy. Initially, breast reconstruction with pedicled TRAM was performed. Postoperatively fat necrosis was developed. Secondary breast reconstruction using LD flap was done. Results: Secondary breast reconstruction using LD flap survived completely and produce successful reconstruction. There was no significant complication in both patients. Conclusion: LD flap provides sufficient, vascularized skin and soft tissue. The flap can be molded easily to replace deficient tissue in all areas of the breast. These attributes make it an ideal candidate for salvage of the partially failed TRAM flap breast reconstruction.
송재민,류성한,김영걸 한국경영정보학회 2023 Asia Pacific Journal of Information Systems Vol.33 No.2
Mobile TV refers to the service that provides live broadcasting and video-on-demand content through a mobile device. In addition to the advertisement as the early-stage revenue model, the paid subscription model has emerged as a more sustainable revenue source for mobile TV services. In this study, with the surveys of 450 free mobile TV users, we examine the motivational factors influencing their intention to adopt a paid subscription model. Results show that three extrinsic motivations, price fairness, subjective norm, and mobile TV utilization, are positively associated with free users’ paid subscription intention. In contrast, intrinsic motivations, such as hedonic need, spatiotemporal convenience, and self-efficacy, have no significant influence on the intention. We also found that the expected value is positively associated with attitude toward mobile TV service, also positively influencing the paid subscription intention.
정보 융합 칼만-Consensus 필터를 이용한 분산 센서 네트워크 구현
송재민,하찬성,황지홍,김태효,Song, Jae-Min,Ha, Chan-Sung,Whang, Ji-Hong,Kim, Tae-Hyo 한국융합신호처리학회 2013 융합신호처리학회 논문지 (JISPS) Vol.14 No.4
무선 센서 네트워크에서 동적 시스템에 대한 consensus 알고리듬은 센서 네트워크의 데이터 융합을 위해 신축적인 알고리듬을 적용할 수 있다. 본 논문은 분산 센서 데이터 기반의 평균적인 consensus 특성을 이용하여 n개의 센서 계측치들의 평균을 추적하기 위해 센서 네트워크의 노드들로 구성되는 하나의 분산 데이터 융합 필터를 구현하였다. 본 consensus 필터는 센서 네트워크에서 분산 칼만 필터링에 의한 구조로 데이터 융합의 문제를 해결한다. consensus 필터의 최적 수렴특성, 잡음 전파의 감소 및 빠른 입력신호들의 추적 능력을 보여준다. 필터링 처리 결과를 확인하기 위해 지그비 통신을 이용하여 각 센서의 출력신호와 필터링 처리 결과 및 각 센서의 개별적 신호들을 통합하고 consensus 필터링 처리 결과를 보였다. In wireless sensor networks, consensus algorithms for dynamic systems may flexibly usable for their data fusion of a sensor network. In this paper, a distributed data fusion filter is implemented using an average consensus based on distributed sensor data, which is composed of some sensor nodes and a sink node to track the mean values of n sensors' data. The consensus filter resolve the problem of data fusion by a distribution Kalman filtering scheme. We showed that the consensus filter has an optimal convergence to decrease of noise propagation and fast tracking ability for input signals. In order to verify for the results of consensus filtering, we showed the output signals of sensor nodes and their filtering results, and then showed the result of the combined signal and the consensus filtering using zeegbee communication.