A hybrid energy harvesting framework for energy efficiency in wireless sensor networks based smart grid applications

2018 17th Annual Mediterranean Ad Hoc Networking Workshop (2018 : Italy)In smart grid applications, Wireless Sensor Net-works (WSNs) which consist of battery limited sensor nodes are used on critical equipments of power distribution grids for monitoring purposes. WSN nodes have tight energy constraints hence it is important to reduce the energy consumption of sensor nodes due to harsh propagation characteristics of smart grid environment. One possible way to reduce the energy consumption is to utilize transmission power control where transmission powers are adjusted according to channel conditions. Another technique is to employ energy harvesting schemes to provide additional power for nodes by using environmental energy sources. Solar and electromagnetic energies are two possible environmental energy sources in outdoor substation environments. Solar energy can be efficiently exploited in a sunny day. On the other hand, electromagnetic energy can be used at any time. In this work, we propose a hybrid energy harvesting model that exploits both solar and electromagnetic energies and develop a Mixed Integer Programming (MIP) method to minimize the energy dissipation of sensor nodes. By using the MIP framework, we quantify the impact of the proposed hybrid energy harvesting model as well as transmission power control on the energy saving of nodes. © 2018 IFIP.The work of V. C. Gungor was supported by the Turkish National Academy of Sciences Distinguished Young Scientist Award Program (TUBA-GEBIP) under Grand no. V.G./TUBA-GEBIP/2013-14

Conceptual design of an e-marketplace for small and medium enterprises in the Turkish machinery industry

This paper reports on the results of a study carried out in the Turkish machinery industry. The purpose of the study was to identify the benefits the sector can seize from e-business and to develop a conceptual framework for potential e-business applications. We analysed the current state of e-business use in the machinery industry in order to understand the future requirements and application opportunities and to come up with a conceptual e-business design that would suit both the needs and the characteristics of the sector. The study included those companies, which are members of the Machine Manufacturers’ Association (MMA) in Turkey. Information about the existing applications and future requirements was obtained from the results of a survey conducted among the member companies. Statistically adequate number of responses was obtained to make the results representative of the machine industry. Web sites of the member companies were also reviewed for further information gathering. Results indicated that most of the companies are Small and Medium Enterprises(SME) and it would be better for them to carry out certain operations through an e-market specifically designed for the sector. The proposed conceptual e-market design is based on the characteristics of the industry emerging from the survey

SİVAS 4 EYLÜL BARAJI İÇME SUYUNDAKİ MANGANIN LABORATUAR VE TESİS ÖLÇEKLİ GİDERİM VERİMLERİNİN KARŞILAŞTIRILMASI

Potable and service water demand of the city Sivas is being supplied partly with the underground water and partly with the stored water within the active basin of the Sivas 4 Eylül Dam. Released discharge which is supplied from the Sivas 4 Eylül Dam is at first step treated at the Water Treatment Plant of the Sivas Municipality and then directed to the water reservoirs and the city main water network. It has been observed that manganese concentration within the potable water supplied from the Sivas 4 Eylül Dam has been increasing during the autumn months (October 2010). Within the scope of this study, appropriate coagulant selection and its optimum dosage determination has been targetted for manganese disposal within the potable water by trying different coagulants via Jar test at laboratory medium. Most appropriate coagulant and its optimum dosage which was determined as a conclusion from the Jar test carried out at laboratory has been applicated at the Water Treatment Plant of the Sivas Municipality. (KMnO4); permanganet of potassium as coagulant, (FeCl3); ferric [Iron (III)] chloride and Anionic Polyelectrolyte as coagulant ancillary chemical has been used. As a conclusion of the test it was determined that manganese disposal efficiency had been 94.7% in case only KMnO4 was used. It was found out that manganese disposal efficiency had been 96.3% in case KMnO4 together with FeCl3 and anionic polyelectrolyte were used. When the optimum conditions of the laboratory mediumwhere high manganese disposal efficiencies are observed were applicated in the facility ; it has been seen that manganese disposal efficiency was 53.4% when appropriate coagulant and its optimum dosage basing the laboratory tests were applicated at site. As a conclusion it has been determined that higher dosages than the ones obtained from laboratory tests were required to be applicated at practice in case a high level manganese disposal at water treatment plant facilities was desired.Sivas kenti, içme ve kullanma suyu ihtiyacının bir kısmını yer altı sularından bir kısmını ise yüzey sularından karşılamaktadır. Sivas 4 Eylül Barajı’ndan temin edilmiş olan yüzey suyu, Sivas Belediyesi İçme  Suyu  Arıtma  Tesisi’nde  arıtılmakta  ve şehir şebekesine  verilmektedir.  4  Eylül Barajı’ndan temin edilmiş olan içme suyundaki mangan konsantrasyonu, sonbahar aylarında (Ekim 2010) artış göstermiştir. Bu çalışmada; içme suyundaki manganı gidermek için laboratuar ortamında yapılan Jar testi çalışmasıyla farklı koagülantlar kullanılarak optimum dozaj ve uygun koagülant seçimi amaçlanmıştır. Jar testi çalışması sonucunda laboratuarda belirlenen en uygun koagülantlar ve optimum dozajlar, içme suyu arıtma tesisinde uygulanmıştır. Koagülant olarak potasyum permanganat (KMnO4), Demir  (III)  Klorür  (FeCl3)  ve  koagülant  yardımcı  kimyasalı  olarak  da  Anyonik  Polielektrolit kullanılmıştır. Deney sonucunda yalnızca KMnO4 kullanılmasıyla mangan giderim veriminin %94,7 olduğu  tespit  edilmiştir.  KMnO4  ile  birlikte  FeCl3  ve  anyonik  polieletrolit  birlikte  kullanıldığında mangan  giderim  verimi  %96,3  olarak  bulunmuştur.  Mangan  giderme  veriminin  yüksek  olduğu laboratuar ortamındaki optimum koşullar tesiste uygulandığında; laboratuar ölçekli elde edilen uygun koagülant ve optimum dozajın saha ölçeğinde uygulanmasıyla mangan giderim veriminin %53,4 olduğu görülmüştür.  Sonuç  olarak;  yüksek  oranlarda  mangan  giderimi  sağlamak  için  içme  suyu  arıtma tesisinde, laboratuar ölçeğinde elde edilen dozajlardan daha yüksek dozajlara gereksinim duyulduğu tespit edilmiştir.

Retrospective analysis of thoracic trauma and evaluation of the factors affecting the duration of stay in the hospital

Background: The aim of this study is to evaluate the epidemiological and demographic features, treatment types of patients with thoracic trauma, as well as the duration of hospital stay and the factors affecting mortality.   Material and Methods: This retrospective cross-sectional study included patients who applied to the emergency room in a tertiary care hospital, between 2017–2019 and having thoracic trauma. Patients; age, gender, date of application, type of injury (blunt or penetran), arrival saturation, use of anticoagulants, type of injury, side of injury (right, left, bilateral) additional injury, hospitalization and mortality status were recorded. P < 0.05 was considered as statistically significant.   Results: Total of 113 people were included in the study. The average age was 52.15 ± 20.3. The most common reason of applying to the hospital was falling with 50 patients. A negative weak correlation was found between saturation and age and hospital stay. In terms of pathology and gender, there was no statistically significant difference in mortality.   Conclusion: As a result, in this study, thoracic trauma occurs mostly in men and due to falls and motor vehicle accidents, and the majority of injuries due to thoracic trauma can heal without follow- up or tube thoracostomy

Catheter-related bacteremia due to Kocuria rosea in a patient undergoing peripheral blood stem cell transplantation

BACKGROUND: Micrococcus species may cause intracranial abscesses, meningitis, pneumonia, and septic arthritis in immunosuppressed or immunocompetent hosts. In addition, strains identified as Micrococcus spp. have been reported recently in infections associated with indwelling intravenous lines, continuous ambulatory peritoneal dialysis fluids, ventricular shunts and prosthetic valves. CASE PRESENTATION: We report on the first case of a catheter-related bacteremia caused by Kocuria rosea, a gram-positive microorganism belonging to the family Micrococcaceae, in a 39-year-old man undergoing peripheral blood stem cell transplantation due to relapsed Hodgkin disease. This uncommon pathogen may cause opportunistic infections in immunocompromised patients. CONCLUSIONS: This report presents a case of Kocuria rosea catheter related bacteremia after stem cell transplantation successfully treated with vancomycin and by catheter removal

Aortic distensibility and coronary artery bypass graft patency

<p>Abstract</p> <p>Background</p> <p>Aortic distensibility is an elasticity index of the aorta, and reflects aortic stiffness. Coronary artery disease has been found to be substantially associated with increased aortic stiffness. In this study we aimed to retrospectively analyze the association of angiographically determined aortic distensibility with the patency rates of coronary bypass grafts</p> <p>Methods</p> <p>The study was conducted in the Cardiology department of the Applied Research Centre for Health of Uludağ University. The coronary angiograms of 53 consecutive coronary bypass patients were analysed retrospectively. Aortic distensibility was calculated using the formula: 2 × (change in aortic diameter)/(diastolic aortic diameter) × (change in aortic pressure). The number of stenosed and patent bypass grafts and the patient characteristics like age, risk factors were noted.</p> <p>Results</p> <p>There were 44 male (83%) and 9 female (17%) cases. Eighteen cases had only one saphenous vein grafting. The number of cases with two, three and four saphenous grafting were 18, 11 and 1; respectively. In the control angiograms the number of cases with one, two, three and four saphenous vein graft obstruction were 15 (31.3%), 7 (14.6%), 1 (2.1%) and 1 (2.1%) respectively. The aortic distensibility did not differ in cases with and without saphenous graft occlusion (p > 0.05). Also left internal mammary artery (LIMA) graft patency was not related to the distensibility of the aorta (p > 0.05). We also evaluated the data for cut-off values of 50 and 70 mmHg of pulse pressure and did not see any significant difference between the groups in terms of saphenous or LIMA grafts.</p> <p>Conclusion</p> <p>In this study we failed to show association of angiographically determined aortic distensibility with coronary bypass graft patency in consecutive 53 patients with coronary artery bypass graft surgery (CABG).</p