PSD estimation in Cognitive Radio systems: a performance analysis

Peer Reviewe

Reliable and Repeatable Power Measurements in DVB-T Systems

Non

Increased accumulation of magnetic nanoparticles by magnetizable implant materials for the treatment of implant-associated complications

Background: In orthopaedic surgery, accumulation of agents such as anti-infectives in the bone as target tissue is difficult. The use of magnetic nanoparticles (MNPs) as carriers principally enables their accumulation via an externally applied magnetic field. Magnetizable implants are principally able to increase the strength of an externally applied magnetic field to reach also deep-seated parts in the body. Therefore, the integration of bone-addressed therapeutics in MNPs and their accumulation at a magnetic orthopaedic implant could improve the treatment of implant related infections. In this study a martensitic steel platelet as implant placeholder was used to examine its accumulation and retention capacity of MNPs in an in vitro experimental set up considering different experimental frame conditions as magnet quantity and distance to each other, implant thickness and flow velocity.Results: The magnetic field strength increased to approximately 112% when a martensitic stainless steel platelet was located between the magnet poles. Therewith a significantly higher amount of magnetic nanoparticles could be accumulated in the area of the platelet compared to the sole magnetic field. During flushing of the tube system mimicking the in vivo blood flow, the magnetized platelet was able to retain a higher amount of MNPs without an external magnetic field compared to the set up with no mounted platelet during flushing of the system. Generally, a higher flow velocity led to lower amounts of accumulated MNPs. A higher quantity of magnets and a lower distance between magnets led to a higher magnetic field strength. Albeit not significantly the magnetic field strength tended to increase with thicker platelets.Conclusion: A martensitic steel platelet significantly improved the attachment of magnetic nanoparticles in an in vitro flow system and therewith indicates the potential of magnetic implant materials in orthopaedic surgery. The use of a remanent magnetic implant material could improve the efficiency of capturing MNPs especially when the external magnetic field is turned off thus facilitating and prolonging the effect. In this way higher drug levels in the target area might be attained resulting in lower inconveniences for the patient

Hernia of Foramen of Morgagni in Adult: Case Report of Laparoscopic Repair

The videolaparoscopic repair of a diaphragmatic hernia of Morgagni by external knot tying technique is described. A 69-year-old woman with subocclusive symptoms by intrathoracic migration of abdominal viscera had an immediate and complete postoperative recovery. The hernial sac was not excised. A four-year follow-up shows no hernia recurrence. This case indicated that the laparoscopic approach can be considered a suitable and safe procedure for treatment of Morgagni's hernia

On Employing a Savitzky-Golay Filtering Stage to Improve Performance of Spectrum Sensing in CR Applications Concerning VDSA Approach

Abstract In this paper, a filtering stage based on employing a Savitzky-Golay (SG) filter is proposed to be used in the spectrum sensing phase of a Cognitive Radio (CR) communication paradigm for Vehicular Dynamic Spectrum Access (VDSA). It is used to smooth the acquired spectra, which constitute the input for a spectrum sensing algorithm. The sensing phase is necessary, since VDSA is based on an opportunistic approach to the spectral resource, and the opportunities are represented by the user-free spectrum zones, to be detected through the sensing phase. Each filter typology presents peculiarities in terms of its computational cost, de-noising ability and signal shape reconstruction. The SG filtering properties are compared with those of the linear Moving Average (MA) filter, widely used in the CR framework. Important improvements are proposed

Anhedonia and functional dyspepsia in obese patients: Relationship with binge eating behaviour

Obese patients (Ob) with a binge eating disorders (BED) behavior pattern have a higher prevalence of postprandial distress syndrome (PDS) compared to Ob without a BED behavior pattern, while an increase of PDS has been described in Ob after sleeve gastrectomy (SG). Hedonic response to a meal is dissociable from satiation in healthy subjects. Anhedonia is the lowered ability to experience pleasure. There are no studies investigating the presence of anhedonia in Ob with and without SG and its relationship to PDS symptoms

Broadband Power Line Communication in Railway Traction Lines: A Survey

Power line communication (PLC) is a technology that exploits existing electrical transmission and distribution networks as guiding structures for electromagnetic signal propagation. This facilitates low-rate data transmission for signaling and control operations. As the demand in terms of data rate has greatly increased in the last years, the attention paid to broadband PLC (BPLC) has also greatly increased. This concept also extended to railways as broadband traction power line communication (BTPLC), aiming to offer railway operators an alternative data network in areas where other technologies are lacking. However, BTPLC implementation faces challenges due to varying operating scenarios like urban, rural, and galleries. Hence, ensuring coverage and service continuity demands the suitable characterization of the communication channel. In this regard, the scientific literature, which is an indicator of the body of knowledge related to BTPLC systems, is definitely poor if compared to that addressed to BPLC systems installed on the electrical transmission and distribution network. The relative papers dealing with BTPLC systems and focusing on the characterization of the communication channel show some theoretical approaches and, rarely, measurements guidelines and experimental results. In addition, to the best of the author's knowledge, there are no surveys that comprehensively address these aspects. To compensate for this lack of information, a survey of the state of the art concerning BTPLC systems and the measurement methods that assist their installation, assessment, and maintenance is presented. The primary goal is to provide the interested readers with a thorough understanding of the matter and identify the current research gaps, in order to drive future research towards the most significant issues

Low-cost multi-channel synchronous data acquisition system based on compressive sampling approach

Peer Reviewe

Laparoscopic reinforced sleeve gastrectomy: early results and complications

BACKGROUND: Sleeve gastrectomy (SG) was pioneered as a two-stage intervention for super and super-super obesity to minimize morbidity and mortality; it is employed increasingly as a primary procedure. Early outcomes and integrity of laparoscopic SG (LSG) against leak using a technique incorporating gastric transection-line reinforcement were studied. METHODS: Between 2003 and 2009, 121 patients underwent LSG (16, two-stage; 105, primary). Of the patients, 66% were women, mean age 38.8 ± 10.9 (15.0-64.0), and body mass index (BMI, kg/m(2)) 48.7 ± 9.3 (33.7-74.8). Bovine pericardium (Peri-Strips Dry [PSD]) was used to reinforce the staple line. Parametric and nonparametric tests were used, as appropriate. The paired t test was used to assess change from baseline; bivariate analyses and logistic regression were used to identify preoperative patient characteristics predictive of suboptimal weight loss. RESULTS: Mean operative time was 105 min (95-180), and mean hospitalization was 5.6 days (1-14). There was no mortality. There were 6 (5.0%) complications: 1 intraoperative leak, 1 stricture, 1 trocar-site bleed, 1 renal failure, and 2 wound infections. There were no postoperative staple-line leaks. Following 15 concomitant hiatal hernia operations, 3 (20%) recurred: 1 revised to RYGB and 2 in standby. Two post-LSG hiatal hernias of the two-stage series required revisions because of symptoms. BMI decreased 24.7% at 6 months (n = 55) to 37.5 ± 9.3 (22.2-58.1); %EWL was 48.1 ± 19.3 (15.5-98.9). Twelve-month BMI (n = 41) was 38.4 ± 10.5 (19.3-62.3); %EWL was 51.7 ± 25.0 (8.9-123.3). Forty-eight-month BMI (n = 13) was 35.6 ± 6.8 (24.9-47.5); %EWL was 61.1 ± 12.2 (43.9-82.1) (p 70% of patients who experienced <50% EWL at 6 months. At 2 weeks, 100% of type 2 diabetes patients (n = 23) were off medication (mean HbA(1C), 5.9 ± 0.5%; glycemia, 90.0 ± 19.9 mg/dL (p < 0.01) at 3 months). CONCLUSIONS: Laparoscopic PSD-reinforced LSG as a staged or definitive procedure is safe and effective in the short term and provides rapid type 2 diabetes mellitus reduction with a very low rate of complications