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Efficiency of Marine Hydropower Farms Consisting of MultipleVertical Axis Cross-Flow Turbines
Georgescu, Andrei-Mugur,Georgescu, Sanda-Carmen,Cosoiu, Costin Ioan,Alboiu, Nicolae Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
This study focuses on the Achard turbine, a vertical axis, cross-flow, marine current turbine module. Similar modules can be superposed to form towers. A marine or river hydropower farm consists of a cluster of barges, each gathering several parallel rows of towers, running in stabilized current. Two-dimensional numerical modelling is performed in a horizontal cross-section of all towers, using FLUENT and COMSOL Multiphysics. Numerical models validation with experimental results is performed through the velocity distribution, depicted by Acoustic Doppler Velocimetry, in the wake of the middle turbine within a farm model. As long as the numerical flow in the wake fits the experiments, the numerical results for the power coefficient (turbine efficiency) are trustworthy. The overall farm efficiency, with respect to the spatial arrangement of the towers, was depicted by 2D modelling of the unsteady flow inside the farm, using COMSOL Multiphysics. Rows of overlapping parallel towers ensure the increase of global efficiency of the farm.
Pseudoaneurysm of the splenic artery
Radu Dumitru,Ana Carbunaru,Mugur Grasu,Mihai Toma,Mihnea Ionescu,Traian Dumitrascu 한국간담췌외과학회 2016 Annals of hepato-biliary-pancreatic surgery Vol.20 No.4
Delayed post-pancreatectomy hemorrhage (PPH) is a relatively uncommon, but feared, complication after pancreaticoduodenectomy (PD). A splenic artery pseudoaneurysm is a rare cause of delayed PPH after a PD. This paper describes the case of a patient with PD used to treat a distal bile duct cholangiocarcinoma complicated with a clinically significant pancreatic fistula and secondary intraabdominal abscess. Computed tomography-guided drainage of the abscess was performed with an apparently favourable outcome; the patient was discharged on postoperative day (POD) 35 and the abdominal drains were removed on POD 50. On POD 80, the patient was readmitted for a severe digestive hemorrhage. Computed tomography revealed a pseudoaneurysm of the splenic artery with a subsequent hematoma formation. Immediately, an angiography was performed and coils were successfully mounted. This case illustrates the rare possibility of the development of a splenic artery pseudoaneurysm with severe delayed PPH after PD complicated with a clinically significant pancreatic fistula, even after the patient was discharged from the hospital. An interventional radiology approach represents the first treatment option in hemodynamically stable patients with high success rates.
Sungwook Hwang(황성욱),Mugur Geana(무거 기아나),Glen T. Cameron(글렌 카메론) 한국여성커뮤니케이션학회 2009 미디어, 젠더 & 문화 Vol.12 No.-
MBC 방송국의 성공적인 각막기증 방송 캠페인을 주목하면서 본 실험연구는 어떻게 한 개인이 인식의 장벽들을 뛰어 넘어 기증서명이라는 하나의 혁신을 채택하게 되는지를 연구하였다. 혁신의 확산이론을 수정 보완한 혁신의 침투 모델을 기반으로 한 기증서명자의 인식의 변화는 다음과 같이 요약된다. 방송 캠페인 프로그램에 노출되기 전 강한 부정적 지식으로서의 유교 문화적 인식은 각막기증이라는 혁신을 거부하였다. 비록 그러한 부정적 지식이 여전히 방송 프로그램으로의 노출 이후에도 존재하였지만 기증을 거부하는 설득적 효과는 전반적으로 약화되었다. 방송 프로그램의 두드러진 특징인 잘 집행된 내러이티브식 화법과 구조는 기증에 대한 태도에 긍정적 영향을 미치는 촉진제로서 기능하였다. 이러한 특징을 갖는 프로그램으로의 노출 이후 피실험자들은 장기기증에 대한 태도에 긍정적 변화를 보여 주었다. 본 연구는 엔터테인먼트 교육 프로그램, 방송, 내러이티브식 구조 등의 요소들이 장기기증을 비롯한 헬스 커뮤니케이션 캠페인에 있어서 긍정적 영향을 낳을 수 있음을 토론한다. Focusing on a successful cornea donation broadcasting campaign in South Korea, this experimental study examined how an individual comes to adopt an innovation beyond a barrier. Based on the Penetration of Innovation model, the change of perception was summarized as follows: Before exposure to the campaign program, strong cultural perception as a powerful negative knowledge rejected the innovation of cornea donation; Even though negative knowledge still exists after exposure to the campaign program, its anti-donation persuasive effect was overall weakened; One feature of the campaign program i.e., well executed narrative structure, functioned as a facilitator to positively influence donation attitude; There was a positive change in attitude towards organ donation after exposure to the campaign program.
SUBCLASSES OF k-UNIFORMLY CONVEX AND k-STARLIKE FUNCTIONS DEFINED BY SĂLĂGEAN OPERATOR
Seker, Bilal,Acu, Mugur,Eker, Sevtap Sumer Korean Mathematical Society 2011 대한수학회보 Vol.48 No.1
The main object of this paper is to introduce and investigate new subclasses of normalized analytic functions in the open unit disc $\mathbb{U}$, which generalize the familiar class of k-starlike functions. The various properties and characteristics for functions belonging to these classes derived here include (for example) coefficient inequalities, distortion theorems involving fractional calculus, extreme points, integral operators and integral means inequalities.
Subclasses of k-uniformly convex and k-starlike functions defined by S[문자]l[문자]gean operator
Bilal [문자]eker,Mugur Acu,Sevtap S[문자]mer Eker 대한수학회 2011 대한수학회보 Vol.48 No.1
The main object of this paper is to introduce and investigate new subclasses of normalized analytic functions in the open unit disc U, which generalize the familiar class of k-starlike functions. The various properties and characteristics for functions belonging to these classes derived here include (for example) coefficient inequalities, distortion theorems involving fractional calculus, extreme points, integral operators and integral means inequalities.
General Formulas for Explicit Evaluations of Ramanujan's Cubic Continued Fraction
Naika, Megadahalli Sidda Naika Mahadeva,Maheshkumar, Mugur Chinna Swamy,Bairy, Kurady Sushan Department of Mathematics 2009 Kyungpook mathematical journal Vol.49 No.3
On page 366 of his lost notebook [15], Ramanujan recorded a cubic continued fraction and several theorems analogous to Rogers-Ramanujan's continued fractions. In this paper, we derive several general formulas for explicit evaluations of Ramanujan's cubic continued fraction, several reciprocity theorems, two formulas connecting V (q) and V ($q^3$) and also establish some explicit evaluations using the values of remarkable product of theta-function.