Securing IEEE 1687-2014 Standard Instrumentation Access by LFSR Key

2015 ◽  
Author(s):  
Hejia Liu ◽  
Vishwani D. Agrawal
Keyword(s):  
Standard Instrumentation

scholarly journals A comparison of the Thunderbeat and standard electrocautery devices in head and neck surgery: a prospective randomized controlled trial

2021 ◽  
Author(s):  
N. C. Kuipers ◽  
B. J. de Kleijn ◽  
J. Wedman ◽  
B. F. A. M. van der Laan ◽  
B. E. C. Plaat ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Blood Loss ◽  
Head And Neck ◽  
Complication Rate ◽  
Operative Time ◽  
Controlled Trial ◽  
Neck Surgery ◽  
Head And Neck Surgery ◽  
Randomized Controlled ◽  
Standard Instrumentation

Abstract Purpose New energy-based sutureless vessel ligation devices, such as the Thunderbeat (Olympus Medical Systems Corp., Tokyo, Japan), could reduce operative time and limit blood loss in head and neck surgery; however, efficacy and safety in major head and neck surgery have not been investigated in a prospective, randomized study. Methods This prospective, double-arm, randomized controlled trial consisted of two parts: total laryngectomy (TL) and neck dissection (ND). Thirty patients planned for TL were randomized in two groups. For the ND part, forty-two operative sides were likewise randomized. In both parts, Thunderbeat was used in addition to the standard instrumentation in the intervention groups, while only standard instrumentation was used in the control groups. Primary outcome values were blood loss, operative time and complication rate. Results For the TL part there was no difference in mean blood loss (p = 0.062), operative time (p = 0.512) and complications (p = 0.662) between both hemostatic techniques. For the neck dissection part, there was a reduction in blood loss (mean 210 mL versus 431 mL, p = 0.046) and in operative time (median 101 (IQR 85–130) minutes versus 150 (IQR 130–199) minutes, p = 0.014) when Thunderbeat was used. There was no difference in complication rate between both hemostatic systems (p = 0.261). Conclusion The Thunderbeat hemostatic device significantly reduces operative blood loss and operative time for neck dissections, without increase in complications. In TL, blood loss using Thunderbeat was comparable with the standard technique, but the operative time tended to be shorter. Trial registration UMCG Research Register, Reg. no. 201700041, date of registration: 18/1/2017

Torsional Vibration, in Rotordynamic System, Identified by Monitoring Gearbox Behaviour

2008 ◽  
Author(s):  
Lorenzo Naldi ◽  
Roberto Biondi ◽  
Valerio Rossi
Keyword(s):  
Power Generation ◽  
Strain Gage ◽  
Measurement System ◽  
Torsional Vibration ◽  
Electrical Machines ◽  
Post Processing ◽  
Optical Probes ◽  
Lateral Vibrations ◽  
Torsional Excitation ◽  
Standard Instrumentation

Nowadays the wide diffusion of the electrical machines, used for power generation, or as driver/helper in Oil&Gas applications, have amplified the problematic related to train torsional excitation. The standard instrumentation installed on the train does not permit to monitor and analyze this kind of stress; therefore to define criteria to screen torsional alternating stress by lateral vibrations becomes extremely important. This paper describes the experience achieved by the authors in the study of rotordynamic behavior of some geared train with the goal to define a methodology to analyze torsional stresses adopting industrial proximity probes (installed in the gear) or a non intrusive measurement system (optical probes). In order to confirm the last technology, an additional classic strain gage torsional measurement has been adopted obtaining similar results. An extensive part of this paper is dedicated to illustrate several test campaigns performed in different site where customers highlighted abnormal vibration levels. Finally, a wide description of data post processing and consequent conclusions are offered.

scholarly journals Static and Dynamic Error of a Biplanar Videoradiography System Using Marker-Based and Markerless Tracking Techniques

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
Daniel L. Miranda ◽  
Joel B. Schwartz ◽  
Andrew C. Loomis ◽  
Elizabeth L. Brainerd ◽  
Braden C. Fleming ◽  
...  
Keyword(s):  
Systematic Error ◽  
Gold Standard ◽  
High Speed ◽  
Angular Displacement ◽  
High Accuracy ◽  
Tracking Algorithm ◽  
Future Research ◽  
Markerless Tracking ◽  
Standard Instrumentation

The use of biplanar videoradiography technology has become increasingly popular for evaluating joint function in vivo. Two fundamentally different methods are currently employed to reconstruct 3D bone motions captured using this technology. Marker-based tracking requires at least three radio-opaque markers to be implanted in the bone of interest. Markerless tracking makes use of algorithms designed to match 3D bone shapes to biplanar videoradiography data. In order to reliably quantify in vivo bone motion, the systematic error of these tracking techniques should be evaluated. Herein, we present new markerless tracking software that makes use of modern GPU technology, describe a versatile method for quantifying the systematic error of a biplanar videoradiography motion capture system using independent gold standard instrumentation, and evaluate the systematic error of the W.M. Keck XROMM Facility’s biplanar videoradiography system using both marker-based and markerless tracking algorithms under static and dynamic motion conditions. A polycarbonate flag embedded with 12 radio-opaque markers was used to evaluate the systematic error of the marker-based tracking algorithm. Three human cadaveric bones (distal femur, distal radius, and distal ulna) were used to evaluate the systematic error of the markerless tracking algorithm. The systematic error was evaluated by comparing motions to independent gold standard instrumentation. Static motions were compared to high accuracy linear and rotary stages while dynamic motions were compared to a high accuracy angular displacement transducer. Marker-based tracking was shown to effectively track motion to within 0.1 mm and 0.1 deg under static and dynamic conditions. Furthermore, the presented results indicate that markerless tracking can be used to effectively track rapid bone motions to within 0.15 deg for the distal aspects of the femur, radius, and ulna. Both marker-based and markerless tracking techniques were in excellent agreement with the gold standard instrumentation for both static and dynamic testing protocols. Future research will employ these techniques to quantify in vivo joint motion for high-speed upper and lower extremity impacts such as jumping, landing, and hammering.

scholarly journals Does Patient-specific Instrumentation Yield Better Component Position than Standard Instrumentation in Total Ankle Arthroplasty?

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0004
Author(s):  
Mario Escudero ◽  
Kevin Wing ◽  
Feras Waly ◽  
Thomas Bemenderfer ◽  
W. Hodges Davis ◽  
...  
Keyword(s):  
Computer Navigation ◽  
Outcome Data ◽  
Total Ankle Arthroplasty ◽  
Patient Specific ◽  
Published Data ◽  
Time Efficiency ◽  
Ankle Arthroplasty ◽  
Radiographic Outcomes ◽  
Patient Specific Instrumentation ◽  
Standard Instrumentation

Category: Ankle Arthritis Introduction/Purpose: The unique anatomy and biomechanics of the ankle joint have made total ankle arthroplasty (TAA) challenging over the past few decades. Final implant position and successful soft tissue balancing are key components to the longevity of total ankle implants. Preoperative computer navigation, templating, and patient-specific instrumentation (PSI) have shown promising results in total ankle replacement with accurate and reproducible radiographic outcomes. Recent data has also suggested that even experienced surgeons benefit from the improved time efficiency of PSI. The purpose of this study is to determine if radiographic outcomes differ between patients undergoing TAA with PSI and those who undergo TAA with standard instrumentation (SI). Methods: The first 67 consecutive patients who underwent primary Infinity total ankle arthroplasty (TAA) at 2 North American sites between 2013 and 2015 were reviewed in a prospective observational study. All TAA’s were performed by one of four fellowship-trained foot and ankle surgeons. Demographic, radiographic, and functional outcome data was collected preoperatively, at 6-12 months postoperatively, and annually thereafter. The radiographic variables measured were the medial distal tibial angle (MDTA), talar tilt angle (TTA), lateral talar station (LTS), sagittal distal tibial articular angle (sDTAA), and the gamma angle. Acceptable intervals for each parameter were selected and TAAs were then categorized as being “correctly aligned” or “not correctly aligned” for all the parameters described. The rate of “correctly aligned” TAA’s was compared between cases with PSI and those with SI. Fisher’s exact test was used to analyze difference by groups. A significance of 5% was used. Results: Of a total of 67 TAAs included, 51 were in the PSI group and 16 in the SI group. No significant statistically differences were found between PSI and NPSI regarding MDTA (p=0.174), LTS (p=0.922), sDTAA (p=0.986), gamma angle (p=0.252) and TTA (p=0.145). We did not find a significant statistical difference in the rate of “correctly aligned TAR” when we compared both groups (p=0.35). Conclusion: This study suggests that both PSI and SI provide accurate and reproducible TAA radiographic alignment when performed by experienced surgeons. In view of previously published data demonstrating high levels of reproducibility for PSI in TAA, these data also suggest that PSI may offer a means for less experienced surgeons to achieve radiographic results similar to those achieved by experienced surgeons. It also suggests that experienced surgeons may not need to use PSI to achieve satisfactory implant alignment, though improved time efficiency with PSI, as demonstrated in other studies, may still be of benefit for experienced surgeons.

Innovative boat-towed transient electromagnetics — Investigation of the Furnas volcanic lake hydrothermal system, Azores

Geophysics ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. E41-E56 ◽  
Author(s):  
Pritam Yogeshwar ◽  
Mira Küpper ◽  
Bülent Tezkan ◽  
Volker Rath ◽  
Duygu Kiyan ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
Field Survey ◽  
Fault Zones ◽  
Volcanic Area ◽  
Noise Sources ◽  
Volcanic Lake ◽  
Time Domain Electromagnetic ◽  
A Minor ◽  
Central Loop ◽  
Standard Instrumentation

Water-covered areas may lead to gaps in surface electromagnetic surveys, causing reduced resolution and, as a consequence, increased uncertainty in derived subsurface models. We have evaluated a boat-towed floating central loop time-domain electromagnetic technique that mitigates this problem. It facilitates obtaining data with a spatial sampling density, which is rarely possible with standard instrumentation on land, and it only requires moderate logistical effort. A unique field study on a shallow volcanic lake demonstrated that this method is feasible with only a minor loss of accuracy when compared to anchored and land soundings. We found that the noise sources arising from the moving instrument and the boat engine can be neglected. The field survey was performed on the Lagoa das Furnas (São Miguel, Azores Islands, Portugal), which is located within an active volcanic area and is characterized by fumarolic fields and [Formula: see text] degassing. Thus, the associated hydrothermal system is expected to extend below the lake. However, the character, geometry, and extent of this system are unknown because of the lack of boreholes and geophysical studies. In total, 600 soundings, combining towed profiles with anchored and land-based soundings, were acquired with an aim of imaging the hydrothermal system beneath the lake down to 200 m. The results from all three types of measurements compare well and thus led to consistent 1D inversion models. The inversion results delineate a highly conductive, smectite-rich cap layer dipping below the lake away from the main fumarole zone. Near this zone, the extent of the conductor agrees well with an area of intense dispersed [Formula: see text] degassing, which appears to be controlled by at least two electrically distinctive fault zones in which the conductor is found at greater depths.

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