Military Academy

About: Military Academy is a based out in . It is known for research contribution in the topics: Population & Fuzzy logic. The organization has 2478 authors who have published 3003 publications receiving 33188 citations.

Spinal Textiloma (Gossypiboma): A Report of Three Cases Misdiagnosed as Tumour

Abstract: Background: Textile products commonly used in surgery (e.g., sponges or gauze) have been known to cause complications after spinal surgery. Associated complications usually arise months or even years after the primary surgery. In case of spine surgery, these bodies are often detected during neuroradiological evaluations to investigate reported back pain; however, this complication often remains asymptomatic. Aims: The research is intended to increase awareness among both spinal surgeons and neuroradiologists of this potential complication. Study Design: Retrospective study. Methods: This study is a retrospective case series of three patients with retained surgical textile products who had been misdiagnosed with spinal tumour. The medical records of the patients were reviewed and demographic data, clinical aspects, initial diagnosis, surgical procedures, time interval between previous operation and onset of symptoms, laboratory findings, radiological findings, treatment, and outcome were analysed. Results: The three patients included two women and one man aged between 64 and 67 years. All patients had a previous surgery for lumbar disc herniation. The time from the previous surgical procedures to presentation ranged from 3 to 17 years. All patients presented with non-specific lower back pain and/or radiculopathy without clinical findings of infection. Laboratory parameters were otherwise normal. All three cases had been misdiagnosed as a spinal tumor based on magnetic resonance imaging findings. During new surgical procedures, gauze bandages, i.e., surgical textiles left during a previous operation, were found. Conclusion: Textiloma is an important and rarely mentioned potential neurosurgical complication that may remain asymptomatic for years. They are more common in obese patients, after emergency surgery, and with unplanned changes in surgical procedure such as bleeding and unintended neurosurgical complications. Neuroradiological findings are variable and non-specific; thus, patients could be misdiagnosed with a spinal tumor or abscess. Likewise, in patients with a history of spinal surgery, spinal abscesses, haematomas, hypertrophic scars, fibrosarcomas, rhabdomyosarcomas, and schwannomas should definitely be considered in the differential diagnosis and considered when planning diagnostic procedures. Appropriate antibiotic therapy is recommended when a suppurative complication is present or suspected. Textiloma is a medico-legal complication that can be prevented by the education of surgical staff, the counting method (preoperatively, at closure, and at the end), and use of products with radiopaque barcodes. Turkish Baslik Spinal Tekstiloma (Gossipiboma): Tumor Olarak Yanlis Tani Konan Uc Olgu Sunumu Arkaplan: Cerrahide yaygin olarak kullanilan tekstil urunlerinin (or. sungerler veya gazli bezler) spinal cerrahi sonrasi komplikasyonlara neden oldugu bilinmektedir. Iliskili komplikasyonlar genellikle ilk ameliyattan aylar, hatta yillar sonra ortaya cikmaktadir. Omurga cerrahisi durumunda, bu cisimler genellikle bildirilen sirt agrisini arastirmak icin yapilan nororadyolojik degerlendirmeler sirasinda tespit edilir, bununla birlikte bu komplikasyon siklikla asemptomatik olarak kalmaktadir. Amac: Arastirma hem spinal cerrahlar hem de nororadyologlar arasinda bu potansiyel komplikasyona farkindaligi artirmayi amaclamaktadir. Calisma Tasarimi: Retrospektif calisma. Yontemler: Bu calisma, spinal tumor olarak yanlis tani konmus olan, cerrahi tekstil urunleri kalmis uc hastanin retrospektif bir olgu serisidir. Hastalarin tibbi kayitlari incelendi ve demografik veriler, klinik yonleri, ilk tani, cerrahi islemler, onceki ameliyat ve semptomlarin baslamasi arasindaki sure, laboratuvar bulgulari, radyolojik bulgular, tedavi ve sonuclari analiz edildi. Bulgular: Uc hasta, yaslari 64 ve 67 yil arasinda olan iki kadin ve bir adamdan olusmaktaydi. Tum hastalar lomber disk hernisi icin onceden ameliyat olmustu. Onceki cerrahi islemlerden basvuruya kadar gecen sure 3 ila 17 yil arasinda degismekte idi. Tum hastalar enfeksiyonun klinik bulgulari olmaksizin radikulopati ve/veya non-spesifik bel agrisi ile basvurdu. Bunun disinda laboratuvar parametreleri normaldi. Her uc olgu da manyetik rezonans goruntuleme bulgularina dayanarak bir spinal tumor olarak yanlis tani almisti. Yeni cerrahi islemler sirasinda, gazli bezler, yani bir onceki islem sirasinda birakilan cerrahi tekstil bulundu. Sonuc: Tekstiloma yillarca asemptomatik kalabilen, onemli ve nadiren bahsedilen potansiyel bir norosirurji komplikasyonudur. Obez hastalarda, acil cerrahi sonrasi siktir ve cerrahi islemde kanama gibi planlanmamis bir degisiklik ile birliktedir ve istenmeyen norosirurji komplikasyonlaridir. Nororadyolojik bulgular degiskendir ve non-spesifiktir; boylece, hastalar spinal tumor veya apse olarak yanlis tani alabilir. Ayni sekilde, spinal cerrahi oykusu olan hastalarda, spinal apse, hematom, hipertrofik skar, fibrosarkom, rabdomyosarkom ve svannom kesinlikle ayirici tanida dusunulmelidir ve tani prosedurleri planlanirken dikkate alinmalidir. Supuratif komplikasyon mevcut veya supheli oldugunda uygun antibiyotik tedavisi onerilir. Tekstiloma bir mediko-legal komplikasyondur ve cerrahi personelin egitimi, sayma yontemi (preoperatif olarak, kapama sirasinda ve sonunda) ve radyoopak barkodlu urun kullanimi ile onlenebilir.

Inverted‐L slot antenna for WLAN operation

Abstract: An inverted-L slot antenna for wireless local area network (WLAN) operation in the 2.4-GHz band (2400–2484 MHz) is presented. The inverted-L slot antenna is obtained by transforming a linear slot into an inverted-L shaped, which makes it very suitable to be placed at the corners of the display panel of a notebook computer. A prototype has been constructed and tested, and good antenna gain and dual-polarization radiation characteristics for WLAN operations are observed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 315–316, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10905

An Evaluation Framework for Comparative Analysis of Generalized Stochastic Petri Net Simulation Techniques

Abstract: Availability of a common, shared benchmark to provide repeatable, quantifiable, and comparable results is an added value for any scientific community. International consortia provide benchmarks in a wide range of domains, being normally used by industry, vendors, and researchers for evaluating their software products. In this regard, a benchmark of untimed Petri net models was developed to be used in a yearly software competition driven by the Petri net community. However, to the best of our knowledge there is not a similar benchmark to evaluate solution techniques for Petri nets with timing extensions. In this paper, we propose an evaluation framework for the comparative analysis of generalized stochastic Petri nets (GSPNs) simulation techniques. Although we focus on simulation techniques, our framework provides a baseline for a comparative analysis of different GSPN solvers (e.g., simulators, numerical solvers, or other techniques). The evaluation framework encompasses a set of 50 GSPN models including test cases and case studies from the literature, and a set of evaluation guidelines for the comparative analysis. In order to show the applicability of the proposed framework, we carry out a comparative analysis of steady-state simulators implemented in three academic software tools, namely, GreatSPN , PeabraiN , and TimeNET . The results allow us to validate the trustfulness of these academic software tools, as well as to point out potential problems and algorithmic optimization opportunities.

Sub-picosecond pulsed THz FET detector characterization in plasmonic detection regime based on autocorrelation technique

Abstract: Many THz applications require detection of sub-picosecond THz pulses. Electronic detectors, in particular, can address this challenge. We report on the detection of sub-picosecond THz pulses generated by a large-area interdigitated photoconductive antenna using a AlGaN/GaN high electron mobility transistor with integrated bow-tie antenna. We demonstrate that the detector's photoresponse is linear in a wide range of gate bias voltages regarding the available THz radiation power with peak power levels of a few hundreds of milliwatts. We apply an autocorrelation technique to investigate the spectral response of our detector within a bandwidth exceeding 1 THz. We observe an unexpected frequency roll-off of responsivity, which can not be predicted using a framework of standard distributed transmission line theory. However, we show that the data can be understood if one accounts for only partial plasmon screening by the gate electrode, so that the results adhere simply to the distributed resistive mixing approximation, whereby the device suffers from the observed roll-off. This indicates, that for novel detectors and radiation sources, which intend to utilize plasma waves, it is important to ensure efficient screening by the gate electrode.