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Ellis-Van-Creveld Syndrome and Congenital Cardiac Anomaly: Common Atrium with Atrioventricular Canal Septal Defect

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： S.Parthasarathy g.srikrishna J.Rohit Fernando N.Muthukrishnan graduate students in Mechanical Engineering Sri Venkateswara college of Engineering Pennalur Sriperumbudur-602 105 Tamil Nadu India Assistant Professor in Mechanical Engineering Sri Venkateswara college of Engineering Pennalur Sriperumbudur-602 105 Tamil Nadu India

To increase the accurate finishingproductivity of Inconel 600, plain turning byTantalum thin film hard coated K20 carbide insert isstudied. The main focus of this investigation is theturning performan

关键词： Machining coated K20 insert toowear surface roughness Inconel 600

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World Journal of Cardiovascular Surgery 2021年第12期11卷 133-140页

作者： srikrishna Sirivella Department of Cardiothoracic Surgery Sri Venkateswara Institute of Medical Sciences Tirupati India

Background: Children presenting with physical features of chondro-ectodermal dysplasia (Ellis-Van Creveld syndrome) such as skeletal and joint abnormalities often have concomitant congenital cardiac anomalies. Presenc... 详细信息

g>Background:g> Children presenting with physical features of chondro-ectodermal dysplasia (Ellis-Van Creveld syndrome) such as skeletal and joint abnormalities often have concomitant congenital cardiac anomalies. Presence of cardiorespiratory symptoms in children with Ellis-Van Craved syndrome warrants a thorough cardiologic evaluation to recognize and treat underlying congenital heart anomaly. Aim: A child with physical stigmata of Ellis-Van-Creveld syndrome is evaluated to detect an associated congenital cardiac anomaly and accomplish successful repair of the underlying cardiac lesion to reduce the cardiac related morbidity and improve the patient survival. Case Presentation: Ten years old boy with chondroectodermal dysplasia (dental anomalies, genu valgum and other skeletal abnormalities) presented with dyspnea and cyanosis. Cardiac evaluation by 2D echo revealed an atrioventricular (AV) canal septal defect with AV valve regurgitation and a common atrium. Angiocardiography showed a goose neck deformity of the left ventricular outflow tract. The Qp/Qs was 3.4: 1, with systemic arterial oxygen desaturation (SaO2 of 0.7) and O2 saturation in the common atrium was 0.7. The pulmonary venous connections to the common atrium were anomalous. Atriotomy on cardiopulmonary bypass and on a cardioplegic arrest discerned a partial AV canal septal defect with a common bridging leaflet, clefts in septal leaflets of tricuspid and mitral vlalves, an incompletely closed interventricular communication, and a common atrium with highly anomalous pulmonary venous insertions well anterior (8 cm) to vena caval orifices. Intracardiac repair was performed with two patches of goertex to

关键词： CHD (Congenital Heart Disease) Cyanotic CHD great Vessel Anomalies CHD Miscellaneous Atrioventricular Septal Defects CHD and Valve Lesions

Parameter Estimation of Single Phase Core Type Transformer Using Bacterial Foraging Algorithm

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Engineering（科研） 2010年第11期2卷 917-925页

作者： Seeni Padma srikrishna Subramanian 不详

The electrical circuit equivalents of magnetic device structures such as transformer require an exact knowledge of its parameters. Efficient parameter estimation technique is essential to obtain the equivalent circuit parameters of transformer because the parameters are used to manipulate parasitic elements and to obtain the enhanced circuit performance. In this paper, Bacterial Foraging Algorithm (BFA) has been applied to estimate the equivalent circuit parameters of single phase core type transformer. The information of open Circuit (OC) and Short Circuit (SC) tests has been utilized in BFA algorithm. The effectiveness of the proposed approach has been tested with a sample transformer and the simulation results are compared against the conventional method. The numerical results show that the proposed approach outperforms the conventional method in the aspects of solution quality.

关键词： Parameter Estimation Transformer Equivalent Circuit Bacterial Foraging Algorithm

Early and Long Term Outcomes of Corrective Operations for Tetralogy of Fallot: An Experience of Two Centers

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World Journal of Cardiovascular Surgery 2014年第11期4卷 186-192页

作者： srikrishna Sirivella Isaac gielchinsky Department of Cardiovascular & Thoracic Surgery Newark Beth Israel Medical Center University of Medicine & Dentistry of New Jersey Newark New Jersey USA

Objectives: Pulmonary valve insufficiency and right ventricular dysfunction may contribute to early and late morbidity and mortality after repair of Tetralogy of Fallot. Right ventricular dysfunction may be attributed to ventriculotomy incision, especially, when it is combined with a transannular patch as employed in the transventricular repair. Transatrial/transpulmonary approach without ventriculotomy and an attempt to preserve the pulmonary valve has been advocated as a method potentially diminishing such adverse events. The prevalence of associated morbidity and mortality and analysis of the results of various surgical approaches for repair of Tetralogy of Fallot formed the basis of this study. Methods: Nine hundred and ninety five patients during 20 yearS period (from 1992 and 2012) with primary diagnosis of Tetralogy of Fallot that underwent total repair operations in two medical centers were analyzed. The mean age of the patients was 2.9 ± 6.9 SE, with female/male ratio of 0.25. The mean long follow-up was 94 months ± 112 SD. Results: Repair via ventriculotomy with transannular patch was the most common technique (n = 627, 63%), followed by infundibulotomy without transannular patch (20%) and transatrial/transpulmonary approach without ventriculotomy (15%). The operative and long term mortality were 3.2% and 4.4%;2% and 3.1%;2% and 2.7% respectively. The overall operative and long term mortality for repairs was 2.9% and 3.4%, with high 3.94% and 6.6% respectively for repairs with right ventricular pulmonary valve conduit. There was statistically significant correlation between the type of repair and mortality risk. Use of transannular patch with ventriculotomy was associated with significant increase in overall mortality risk and operative mortality compared with ventriculotomy without transannular patch. [Odds ratio, 2.10;95% confidence interval: 1.29-3.64]. Operations that have been performed before 2000 have resulted in increased operative risk compared wi

关键词： Ttralogy of Fallot Transventricular Repair Transannular Patch Ventriculotomy Transatrial/Transpulmonary Repair

Clinical presentation and endoscopic management of Dieulafoy's lesions in an urban community hospital

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World Journal of gastroenterology 2007年第32期13卷 4333-4335页

作者： srikrishna Nagri Suryanarayan Anand Yashpal Arya Department of gastroenterology Brooklyn Hospital CenterBrooklynNY 11201United States Wyckoff Heights Medical Center Department of GastroenterologyWyckoff Heights Medical Center374 Stockholm StBrooklynNY 11237United States

AIM:To identify rates of occurrence,common clinical and endoscopic features,and to review the outcome of endoscopic management of Dieulafoy's lesions in the upper gastrointestinal (gI) tract in an urban community hospital setting. METHODS:Endoscopic data from esophagogastroduo denoscopies (EgDs),done at Wyckoff Heights Medical Center,Brooklyn,NY between 2000 and 2006 were reviewed to identify patients with Dieulafoy's lesions. Demographic data,medical history,examination findings,lab data,endoscopic findings and details of therapy for patients treated for Dieulafoy's lesions were reviewed retrospectively. RESULTS:Dieulafoy's lesions were documented to be the cause of bleeding in approximately 1% of patients presenting with upper gastrointestinal bleeding,while they were detected in only 2 patients when the indications for EgDs were different from active gI bleeding. When we analyzed EgDs performed in patients above age 65 years presenting with gastrointestinal bleeding,prevalence of Dieulafoy's lesions approached 10 percent. The most common location of the lesion was the body of stomach (7),followed by the cardia (4) and the esophagus (2). One patient had this lesion in the fundus and one patient in the duodenal apex. All patients were initially treated endoscopically with epinephrine injection,in eight cases heater probe was applied following epinephrine and endoscopic clips were applied in two cases. All but one of the patients did well in near and intermediate term follow-up (average follow-up period of 18 mo). One patient died of multi-organ failure during the same hospital stay. Average length hospital stay was 7 ***:Community hospital gastroenterologists and endoscopists should be aware that Dieulafoy's lesions are an uncommon cause of upper gI bleeding among elderly patients. Early accurate diagnosis through emergent endoscopy and endoscopic therapy,especially in patients with multiple co-morbid conditions,can be very effective and life saving.

关键词： Dieulafoy's lesion gastrointestinal bleeding Community Hospital Endoscopic treatment Obscure gI bleeding

Sequential Approach with Matrix Framework for Various Types of Economic Thermal Power Dispatch Problems

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Energy and Power Engineering 2010年第2期2卷 111-121页

作者： srikrishna Subramanian ganesan Sivarajan Department of Electrical Engineering FEAT Annamalai University

This paper presents a sequential approach with matrix framework for solving various kinds of economic dispatch problems. The objective of the economic dispatch problems of electrical power generation is to schedule the committed generating units output so as to meet the required load demand while satisfying the system equality and inequality constraints. This is a maiden approach developed to obtain the optimal dispatches of generating units for all possible load demands of power system in a single execution. The feasibility of the proposed method is demonstrated by solving economic load dispatch problem, combined economic and emission dispatch problem, multiarea economic dispatch problem and economic dispatch problem with multiple fuel options. The proposed methodology is tested with different scale of power systems. The generating unit operational constraints are also considered. The simulation results obtained by proposed methodology for various economic dispatch problems are compared with previous literatures in terms of solution quality. Numerical simulation results indicate an improvement in total cost saving and hence the superiority of the proposed method is also revealed for economic dispatch problems.

关键词： Combined Economic and Emission Dispatch Composite Cost Function Economic Dispatch Multiarea Economic Dispatch Multiple Fuel Options Prohibited Operating Zone Ramp Rate Limits Sequential Approach Transmission Loss

Composite Cost Function Based Solution to the Unit Commitment Problem

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Smart grid and Renewable Energy 2010年第2期1卷 88-97页

作者： srikrishna Subramanian Radhakrishnan Anandhakumar 不详

This paper presents a new approach via composite cost function to solve the unit commitment problem. The unit com-mitment problem involves determining the start-up and shut-down schedules for generating units to meet the fore-casted demand at the minimum cost. The commitment schedule must satisfy the other constraints such as the generating limits, spinning reserve, minimum up and down time, ramp level and individual units. The proposed algorithm gives the committed units and economic load dispatch for each specific hour of operation. Numerical simulations were carried out using three cases: four-generator, seven-generator, and ten-generator thermal unit power systems over a 24 h period. The produced schedule was compared with several other methods, such as Dynamic programming, Branch and bound, Ant colony system, and traditional Tabu search. The result demonstrated the accuracy of the proposed method.

关键词： Composite Cost Function generation Scheduling Unit Commitment

Cardiac Immobilization in Beating Heart Surgery Using Pericardial Bands

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World Journal of Cardiovascular Surgery 2012年第2期2卷 14-16页

作者： srikrishna Sirivella Isaac gielchinsky Department of Cardiovascular and Thoracic Surgery Newark Beth Israel Medical Center University of Medicine &

A novel technique of stabilization of the coronary targets with autogenous pericardial bands is described in off pump coronary revascularizations. Pericardial bands are placed across the coronary targets and snared to the pericardial well for local cardiac immobilization. This technique can be used as an alternate to mechanical stabilizers for immobilization of the coronary targets.

关键词： Coonary Bypass Surgery Cardiac Off Pump CABg

Bacterial Foraging Algorithm based Parameter Estimation of Three WINDINg Transformer

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Energy and Power Engineering 2011年第2期3卷 135-143页

作者： srikrishna Subramanian Seeni Padma 不详

Transformers are one of the main components of any power system. An accurate estimation of system be-haviour, including load flow studies, protection, and safe control of the system calls for an accurate equiva-lent circuit parameters of all system components such as generators, transformers, etc. This paper presents a methodology to estimate the equivalent circuit parameters of the Three Winding Transformer (TWT) using Bacterial Foraging Algorithm (BFA). The estimation procedure based on load test data at one particular op-erating point namely supply voltage, load currents, input power. The performance characteristics, such as efficiency and voltage regulation are considered along with the name plate data in order to minimize the er-ror between the estimated and measured data. The estimation procedure is demonstrated with a sample three winding transformer and the results are compared against the directly measured performance of TWT and genetic algorithm optimization results. The simulation results show the ability of the proposed technique to capture the true values of the machine parameters and the superiority of the results obtained using the bacte-rial foraging algorithm.

关键词： Parameter Estimation Three Winding Transformer Bacterial Foraging Algorithm