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Traumatic Coronary Artery Dissection in a Young Woman after a Kick to Her Back
Emrah Ipek,Emrah Ermis,Selami Demirelli,Erkan Yıldırım,Mustafa Yolcu,Bingül Dilekci Sahin 대한흉부외과학회 2015 Journal of Chest Surgery (J Chest Surg) Vol.48 No.4
We present the case of a 38-year-old woman admitted to our outpatient clinic with accelerating back pain and fatigue following a kick to her back by her husband. Upon arrival, we detected ST segment elevation in the D1, aVL, and V2 leads and accelerated idioventricular rhythm. She had pallor and hypotension consistent with cardiogenic shock. We immediately performed coronary angiography and found a long dissection starting from the mid-left main coronary artery and progressing into the mid-left anterior descending (LAD) and circumflex arteries. She was then transferred to the operating room for surgery. A saphenous vein was grafted to the distal LAD. Since the patient was hypotensive under noradrenaline and dopamine infusions, she was transferred to the cardiovascular surgery intensive care unit on an extracorporeal membrane oxygenator and intra-aortic balloon pump. During follow-up, her blood pressure remained low, at approximately 60/40 mmHg, despite aggressive inotropic and mechanical support. On the second postoperative day, asystole and cardiovascular arrest quickly developed, and despite aggressive cardiopulmonary resuscitation, she died.
SIMULATION OF FREE SURFACE FLOW OVER TRAPEZOIDAL OBSTACLE WITH LATTICE BOLTZMANN METHOD
Emrah Korkmaz(코르크마츠 엠라),Rho-Taek Jung(정노택) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.2
An air-water free surface flow simulation by using the Lattice Boltzmann Method(LBM) has not been studied a lot compared with the done by the Navier-Stoke equation. This paper shows the LBM is as one of the application tools for the free surface movement over an obstacle. The Mezo scaled application tool has been developed with two dimensional and nine discretized velocity direction using conventional lattice Bhatnagar-Gross-Krook model. Boundary conditions of a halfway-based for solid wall and a kinematic-based for interface are adopted. A validation case with a trapezoidal shape bump to make a comparison between freesurface movements from computational results and experimental ones was described with grid size dependency.
Identity of cheese: a research on the cheeses of the Aegean Region in Turkey
Emrah Keskin 한국식품연구원 2020 Journal of Ethnic Foods Vol.7 No.-
Cheese, which has a deep-rooted history, is a food product that reflects the cultural memory and history of communities, besides being a method of preserving milk. Cheese varieties differ according to the cultural structure of the countries, climatic conditions, animal diversity, and production techniques. Different types of cheese are produced in different ways in different geographical regions of Turkey. The Aegean Region, one of the geographical regions in Turkey, stands out with its unique cheese varieties. The current study aims to identify cheeses produced in the Aegean Region and to discuss them in the context of gastronomy tourism and cultural heritage. For this purpose, a document analysis was carried out in order to provide information about the identification and production methods of cheeses specific to the Aegean Region. As a result of the review of the documents, cheeses peculiar to the region were put forward.
Emrah Caliskan,Evrim Karadag Saygi,Zeynep Kardelen Gencer,Hizir Kurtel,Bulent Erol 대한정형외과학회 2018 Clinics in Orthopedic Surgery Vol.10 No.4
Background: Advances in surgical techniques, implant technology, radiotherapy, and chemotherapy have increased the recovery chances of patients with bone sarcomas. Accordingly, patients’ expectations on life quality have also increased, highlighting the importance of objective evaluation of the functional results of reconstruction. Methods: Thirteen patients with distal femoral endoprosthesis, who had been followed for an average of 2.9 years were evaluated. Postural stability, daily energy expenditure, muscle power, and range of motion were the four parameters analyzed in this study. The Musculoskeletal Tumor Society (MSTS) score and Toronto Extremity Salvage Score (TESS) were used to assess postoperative function and examine correlations with other parameters. Results: Patients had sedentary activities in 84% of their daily lives. They exhibited a slower speed in the walk across test and a higher sway velocity in the sit-to-stand test (p = 0.005). MSTS scores were significantly correlated with the daily energy expenditure and walking speed. Conclusions: Objective functional results acquired from various clinics will provide significant data to compare reconstruction techniques, rehabilitation protocols, and surgical techniques. In this way, it will be possible to satisfy the expectations of patients that increase in relation to enhanced recovery.
Primary Mature Cystıc Teratoma Mimickıng an Adrenal Mass in an Adult Male Patient
Emrah Okulu,Kemal Ener,Mustafa Aldemir,Evren Isik,Cigdem Irkkan,Onder Kayigil 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.2
Teratomas are bizarre neoplasms derived from embryonic tissues that are typicallyfound only in the gonadal and sacrococcygeal regions of adults. Primary retroperitonealteratomas are rare and present challenging management options. We report a case ofa unilateral primary retroperitoneal mature cystic teratoma mimicking an adrenalmass in a 54-year-old male patient. Complete resection of the adrenal mass was performedby the flank approach by using the 11th rib resection. Because of the risk of malignancy,follow-up radiographic studies were performed to ensure the oncologic efficacyof resection. The patient has been free of recurrence for longer than 12 months.
A refined functional and mixed formulation to static analyses of fgm beams
Emrah Madenci 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.4
In this study, an alternative solution procedure presented by using variational methods for analysis of shear deformable functionally graded material (FGM) beams with mixed formulation. By using the advantages of Gâteaux differential approaches, a refined complex general functional and boundary conditions which comprises seven independent variables such as displacement, rotation, bending moment and higher-order bending moment, shear force and higher-order shear force, is derived for general thick-thin FGM beams via shear deformation beam theories. The mixed-finite element method (FEM) is employed to obtain a beam element which have a 2-nodes and total fourteen degrees-of-freedoms. A computer program is written to execute the analyses for the present study. The numerical results of analyses obtained for different boundary conditions are presented and compared with results available in the literature.
Optimization of flexure stiffness of FGM beams via artificial neural networks by mixed FEM
Emrah Madenci,Şaban Gülcü 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.5
Artificial neural networks (ANNs) are known as intelligent methods for modeling the behavior of physical phenomena because of it is a soft computing technique and takes data samples rather than entire data sets to arrive at solutions, which saves both time and money. ANN is successfully used in the civil engineering applications which are suitable examining the complicated relations between variables. Functionally graded materials (FGMs) are advanced composites that successfully used in various engineering design. The FGMs are nonhomogeneous materials and made of two different type of materials. In the present study, the bending analysis of functionally graded material (FGM) beams presents on theoretical based on combination of mixed-finite element method, Gâteaux differential and Timoshenko beam theory. The main idea in this study is to build a model using ANN with four parameters that are: Young’s modulus ratio (Et/Eb), a shear correction factor (ks), power-law exponent (n) and length to thickness ratio (L/h). The output data is the maximum displacement (w). In the experiments: 252 different data are used. The proposed ANN model is evaluated by the correlation of the coefficient (R), MAE and MSE statistical methods. The ANN model is very good and the maximum displacement can be predicted in ANN without attempting any experiments.
Are Marine Accident Really Accident? Fallacy of Random Marine Accidents in Dry Cargo Fleet
Emrah BULUT,Shigeru YOSHIDA 한국해운물류학회 2015 The Asian journal of shipping and Logistics Vol.31 No.2
The aim of this paper is to investigate the relation between marine casualty and dry bulk cargo freight rate according to the existence of spurious accident phenomenon in the dry cargo vessel accidents. According to the conventional expectation, the volume of marine accidents is a random process since it is accidently occurred and not a man-made outcome. Under this circumstance, it is expected that the volume of marine accidents should be statistically uncorrelated with the freight market rates and positively correlated with the fleet size. However, the existence statistics on dry cargo marine accidents indicate high level of negative correlation with freight markets (-0.95 for no. of vessels and -0.79 for the volume of accidents in dwt) and also high level of negative correlation with the fleet size (-0.81 for the volume of accidents in dwt). The asymmetric interaction between the widely accepted facts and the statistical foundations is the main concern of this paper which is named the “Fallacy of Random Marine Accidents (FRMA)”. The possible reasons of the FRMA phenomenon are considered to be based on the man-made marine accidents because of the financial collapse or as the well known term the credit default risk.
Emrah Madenci,Sabry Fayed,Walid Mansour,Yasin Onuralp Özkılıç 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.5
This study reports the results of a series of tests of pultruded glass fiber reinforced polymer (P-GFRP) box section composite profile columns, geometrically similar with/without concrete core, containing 0-1-2-3% steel fiber, with different lengths. The recycled steel wires were obtained from waste tyres. The effects of steel fiber ratio on the collapse and size effect of concrete filled P-GFRP columns under axial pressure were investigated experimentally and analytically. A total of 36 columns were tested under compression. The presence of pultruded profile and steel wire ratio were selected as the primary variable. The capacity of pultruded profiles with infilled concrete are averagely 9.3 times higher than the capacity of concrete without pultruded profile. The capacity of pultruded profiles with infilled concrete are averagely 34% higher than that of the pultruded profiles without infilled concrete. The effects of steel wire ratio are more pronounced in slender columns which exhibit buckling behavior. Moreover, the proposed analytical approach to calculate the capacity of P-GFRP columns successfully predicted the experimental findings in terms of both pure axial and buckling capacity.
Emrah Salman,Murat Yilmaz 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.7
Improvement of the low-speed sensorless position control for an interior permanent magnet synchronous motor (IPMSM), which drives a horizontal axis washing machine drum, extended-flux (EF) model-based PI observer (PIO) system is proposed. This control is designed to estimate the derivatives of the EF components, which are voltage components, from which the rotor position information is extracted. Motor parameters change during the operation because of the load and temperature, and those changes affect the performance of sensorless IPMSM drive, especially at low-speed operation. For satisfactory low-speed operation, observer gains should be carefully selected to reduce the influence of measurement noise and un-modeled dynamics. Linear quadratic (LQR) control method is used to calculate the optimal coefficients of a PIO to improve low-speed performance. The PI observer is chosen for its capability to decouple modeling uncertainties and measurement noise. The effectiveness of the proposed sensorless method is verified by the simulation on MATLAB/Simulink and experimental results in a 900W IPMSM drive for washing machine. The proposed estimator achieves stable operation at 87 rpm 100% and 45 rpm 25% load torque conditions. It has a much better dynamic performance and improved capability and is robust for speed and torque variations in the system.