Partial Nephrectomy of a Horseshoe Kidney With Renal-Cell Carcinoma and Cholecystectomy: a Case Report

DergiPark: 819253tmsjAims: Horseshoe kidneys are the most common type of renal fusion anomaly and it may be associated with other anomalies and complications. Our case aims to present the partial nephrectomy of a horseshoe kidney with renal-cell carcinoma and cholecystectomy. Case Report: A sixty-year-old male patient was admitted to our outpatient clinic with a 3 cm suspicious mass in the horseshoe kidney that was detected during an attack of acute cholecystitis. Computed tomography revealed a heteroge- neous hypodense lesion containing millimetric calcific foci of 35x31x33 mm in size at the ventral middle part of the right kid- ney. Partial nephrectomy was performed non-ischemically and then cholecystectomy was performed. Pathological examination revealed stage T1a clear cell renal carcinoma, WHO/ISUP Grade 2 with a negative surgical margin. During follow-up; urea, creatinine, and glomerular filtration rate were found to be normal. Conclusion: Horseshoe kidneys are fairly common among renal anomalies. Cholecystectomy following non-ischemic partial nephrectomy for a tumor in the horseshoe kidney is a rare case

A Current Overview of Intensive Care Subspeciality Education in Turkey: What Do Educational Staff, Subspecialty Residents and Specialists Think?

Objective: Intensive care subspecialty programs have been opened in many medical faculties and training-research hospitals in our country, and intensivists who have graduated are working in the field. The aim of this study aimed to collect information about the status of intensive care subspecialty education and the working conditions of intensive care specialists working in the field. Materials and Methods: After obtaining the ethics committee approval, three questionnaires for intensive care subspecialty educational staff (ES), research assistants (RA), and graduated specialists (PG) were prepared through the Google Survey and published on social media. In the questionnaires, the status of education and working conditions in the field after graduation were questioned. The descriptive statistics method was used for analysis. Results: The questionnaires were answered by 38 ES, 99 RA, and 46 PG. Fifty-four percent of the ES were between the ages of 51 and 60 and 65.8% were women. Fifty-one percent of ES were working in a university hospital. Forty-seven percent of full-time ES were working in the department of anesthesiology and reanimation subdepartment of intensive care, and the rate of participation of all partner clinics in the program was 86.5%. Twenty-seven (71.1%) of the ES thought that the TUKMOS core training program should be changed. The main specialty of 54.5% of RAs were anesthesiology and reanimation, and 52% of them were studying at a state university. The rate of those who were on duty at the hospital was 87.8%, and the rate of those who described the rotation training as “medium” was 36.5%. Sixty-five percent of the PGs were anesthesiology and reanimation specialists, and 64.4% said that they would like to primarily work in training and research hospitals in terms of efficiency and qualit; 87% of them stated that intensive care specialists should be able to work in any kind of intensive care unit, 69.6% thinks that the education they receive is sufficient. Conclusion: We believe that evaluating and sharing the data of this study may cause positive changes in intensive care subspecialty education and post-graduate working conditions

Performance Analysis of Fault Current Limiting Methods on IEEE 9-Bus System

11th International Conference on Electrical and Electronics Engineering (ELECO) -- NOV 28-30, 2019 -- Bursa, TURKEY -- Chamber Elect Engineers Bursa Branch, Bursa Uludag Univ, Dept Elect Elect Engn, Istanbul Tech Univ, Fac Elect & Elect Engn, IEEE Turkey SectThe fault current levels gradually increase with becoming widespread of distributed generation units, expansion of power systems, increased current levels, and power demand. High fault currents can cause damage to the power system components or shorten their life. This can bring about serious economic costs and affect the reliability of the system. In this study, three different fault current limiting methods such as current limiting series reactor, high impedance transformer and controlled series reactor (solid-state) fault current limiter that is applied in the IEEE 9-bus system are analyzed for three-phase fault and their effects to the system are discussed for normal operating conditions. The power system and current limiters are modeled in PSCAD/EMTDC.WOS:0005526541000272-s2.0-8508090539

A new approach to limit fault current with series-parallel resonance strategy

Increased power generation depending on demand, becoming widespread of distributed generation systems connecting to the grid in parallel, and the expansion of network cause the fault current levels to increase in power systems. Fault current limiters are being developed to prevent damages triggered by high fault currents and indirect effects on the network. In this study, a new series-parallel resonance-type fault current limiter (SPRFCL) is proposed. In normal operation, the SPRFCL that remains passively in the system in series resonance at the main frequency limits the fault current by means of the high impedance shown by parallel resonance when a fault condition is detected with the control circuit. The most important advantages of the SPRFCL are that in all short-circuit fault types, limiting the fault currents with a low amplitude oscillation, restraining the rising rate of fault current and also the sags in PCC (common coupling point) voltage can be successfully suppressed. SPRFCL is mathematically modeled, and simulation studies are performed in PSCAD. The performance of SPRFCL on critical parameters is revealed by presenting the obtained results.WOS:0005164884000012-s2.0-8507978326

Şebekeden bağımsız hibrit sistemin (rüzgar-fotovoltaik) performans analizi

Sizing of PV panel, wind turbine and storage batteries in hybrid energysystems is the most important research topic for a system design. Thereare many studies in the literature, using different approaches aboutsizing of hybrid renewable energy systems. In this study, experimentaland simulation performance differences of the installed hybrid systemare presented. The system that is installed in Yildiz Technical University,has 600 W wind turbine, 2x320 W photovoltaic (PV) panel group and4x210 Ah batteries. A maximum power point tracking (MPPT)controller, a hybrid controller and an inverter are utilized to control thepanels, wind turbine and power flow. A weather station is used tomeasure the weather conditions such as wind speed, temperature,radiation, and electrical quantities are recorded by a data logger. Thesystem is modelled depending on the datasheets of the components, andthe modelling results are compared with experimental results.Hibrit enerji sistem tasarımında fotovoltaik panel, rüzgar türbini ve akülerin boyutlandırılması en önemli araştırma konusudur. Literatürde hybrid yenilenebilir enerji sistemlerinin boyutlandırılmasında farklı yaklaşımlar kullanan çok sayıda çalışma bulunmaktadır. Bu çalışmada, kurulan bir hibrit sistemin deneysel ve simülasyon sonuçları arasındaki farklılıklar ortaya konmuştur Yıldız Teknik Üniversite’sinde kurulan sistem 600 W rüzgar türbini, 2x320 W fotovoltaik panel ve 4x210 Ah akü içermektedir. Maksimum güç noktası takip kontrol cihazı, hibrit kontrolcü ve inverter sırasıyla panel, türbin ve çıkış gücü kontrolü için kullanılmıştır. Hava istasyonu rüzgar hızı, sıcaklık, ışınım gibi hava verilerini kaydetmek için ve veri kaydedici de elektriksel büyüklükleri kayıt altına almak için kullanılmıştır. Sistem kullanılan bileşenlerin katalog bilgilerine göre modellenmiştir ve modelleme sonuçları ile uygulama sonuçları karşılaştırılmıştır.WOS:00049092950000

Introduction to Hybrid Systems - Yildiz Technical University

IEEE EUROCON Conference -- JUL 01-04, 2013 -- Zagreb, CROATIA -- IEEE, IEEE Croatia Sect, IEEE Reg 8, FEREnergy has always been an important factor for socio-economic development of humans. Most of the energy is generated from fossil fuels in the world. Nevertheless, environmental aspects and depleting of fossil fuels causes increase of renewable energy utilization. The produced energy from renewable energy resources are transferred to grid or used in stand-alone systems. As energy generation depends on environmental conditions, efficiency and energy potential of renewable energy systems changes according to region of installation. In this study, introduction of the solar-wind-battery hybrid system constructed in Davutpasa Campus, Yildiz Technical University, and future work for the system are presented.Yildiz Technical UniversityYildiz Technical University [2012-04-02-KAP04]Authors would like to thank the Yildiz Technical University for full financial support of the project namely Reliability Analysis of Small Scale Hybrid Wind and Solar Energy Systems: A Case Study of Davutpasa Campus, Project No: 2012-04-02-KAP04.WOS:0003431356001672-s2.0-8488863062

A New Approach for Grid-Connected Hybrid Renewable Energy System Sizing Considering Harmonic Contents of Smart Home Appliances

Even renewable energy sources provide several advantages, especially from an environmental point of view, where the world has faced great challenges in the last few decades; several negative issues also exist regarding the integration of renewable resources-based power production units in electric power systems. One of the main problems related to pivotal renewable energy resources such as solar, wind, etc., is their stochastic and uncontrollable nature in terms of power production. Therefore, this stochasticity in the supply side of the power system may pose many challenges for system operators. This issue is also problematic for smaller applications where the stochastic production by a main resource, such as a roof-top photovoltaic system, and load demand may not match perfectly at each time instant and therefore should be compensated by additional resources such as battery-based energy storage systems. Herein, the economic considerations to ensure minimum costs for such a hybrid system design are vital so as to increase the penetration of such systems. Therefore, the optimal sizing and planning of hybrid systems have recently gained increasing importance to enhance power system operation in the context of the smart grid paradigm. From a different perspective, harmonics are one of the most important power quality problems in system operations caused by widespread integration of power electronic loads with non-linear characteristics that should be considered. Thus, a new approach for grid-connected hybrid renewable energy system sizing is provided. In order to determine optimal capacities for photovoltaic (PV) and energy storage system (ESS) units for covering residential consumer demand, a mixed integer linear programming (MILP)-based formulation is presented. The main objective is minimizing total costs of the system consisting of investment, capital and maintenance cost functions. A daily power curve is created accurately with real measurements of non-linear loads considering harmonic contents of smart home appliances in Yildiz Technical University, Istanbul, Turkey. In addition, real radiation and temperature values are used in PV production as well as dynamic pricing schemes for realistic evaluations. Moreover, optimal sizing results are compared for both the harmonic-based power curve and rated power curve in terms of satisfying objective function