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Fulltext Identification of transformer fault based on dissolved gas analysis using hybrid support vector machine-modified evolutionary particle swarm optimisation

Illias HA, Zhao Liang W

PLoS One, 2018;13(1):e0191366.
PMID: 29370230 DOI: 10.1371/journal.pone.0191366

Early detection of power transformer fault is important because it can reduce the maintenance cost of the transformer and it can ensure continuous electricity supply in power systems. Dissolved Gas Analysis (DGA) technique is commonly used to identify oil-filled power transformer fault type but utilisation of artificial intelligence method with optimisation methods has shown convincing results. In this work, a hybrid support vector machine (SVM) with modified evolutionary particle swarm optimisation (EPSO) algorithm was proposed to determine the transformer fault type. The superiority of the modified PSO technique with SVM was evaluated by comparing the results with the actual fault diagnosis, unoptimised SVM and previous reported works. Data reduction was also applied using stepwise regression prior to the training process of SVM to reduce the training time. It was found that the proposed hybrid SVM-Modified EPSO (MEPSO)-Time Varying Acceleration Coefficient (TVAC) technique results in the highest correct identification percentage of faults in a power transformer compared to other PSO algorithms. Thus, the proposed technique can be one of the potential solutions to identify the transformer fault type based on DGA data on site.

Matched MeSH terms: Equipment Failure/statistics & numerical data
Fulltext The rate of glove perforations in orthopaedic procedures: single versus double gloving. A prospective study

Chan KY, Singh VA, Oun BH, To BH

Med J Malaysia, 2006 Dec;61 Suppl B:3-7.
PMID: 17605178

Glove perforation during surgery has always been a matter of concern as it increases the infection rate and the risk of transmission of blood borne diseases. To determine the common causes, the site and the awareness of glove perforations in orthopaedic surgery, a prospective study was conducted to assess the rate of glove perforation during 130 consecutive orthopaedic operations. All gloves worn by the surgical team were assessed after the surgery using the water-loading test. A total of 1452 gloves were tested, and the rate of perforation was 3.58%. Most of these perforations (61.5%) were unnoticed. The main surgeons had the most perforations (76.9%), followed by first assistants (13.5%) and second assistants (9.6%). Most perforations occurred at the non-dominant hand. The commonest site of perforation was the index finger followed by the thumb. Shearing force with instruments accounted for 45% of the noticed perforations. Majority of these occurred during nailing procedures (33%) and internal fixation without the use of wires (19%). Our rate of glove perforation is similar to other series. Most of them went unnoticed and were mainly due to shearing injuries rather than perforation by sharps. Therefore, there is an increased risk of contamination and break in asepsis during surgery.

Matched MeSH terms: Equipment Failure/statistics & numerical data
Impact of interventional nephrology on outcome and penetration rate of a CAPD program

Wong CM, Ng KP, Keng TC, Lim SK, Tan SY

Perit Dial Int, 2011 3 24;31(2):194-6.
PMID: 21427247 DOI: 10.3747/pdi.2009.00237
Matched MeSH terms: Equipment Failure/statistics & numerical data*
Fulltext Mechanical failure of Dynamic Hip Screw (DHS) fixation in intertrochanteric fracture of the femur

Nordin S, Zulkifli O, Faisham WI

Med J Malaysia, 2001 Dec;56 Suppl D:12-7.
PMID: 14569760

We studied 60 intertrochanteric fractures of the femur fixed with Dynamic Hip Screw (DHS). There were 10 cases (16.7%) with cutting-out of device through femoral head and neck. Stable fracture pattern, postero-inferior and central position of screw in the femoral neck and head produced high percentage of good result, whereas anterior or superior position of screw produced higher incidence of cut-out. We found osteoporosis and distance of screw tip to subchondral bone to have no influence on the final outcome.

Matched MeSH terms: Equipment Failure/statistics & numerical data
Vascular Access Outcomes Reported in Maintenance Hemodialysis Trials: A Systematic Review

Viecelli AK, O'Lone E, Sautenet B, Craig JC, Tong A, Chemla E, et al.

Am J Kidney Dis, 2018 03;71(3):382-391.
PMID: 29203125 DOI: 10.1053/j.ajkd.2017.09.018

BACKGROUND: Many randomized controlled trials have been performed with the goal of improving outcomes related to hemodialysis vascular access. If the reported outcomes are relevant and measured consistently to allow comparison of interventions across trials, such trials can inform decision making. This study aimed to assess the scope and consistency of vascular access outcomes reported in contemporary hemodialysis trials.
STUDY DESIGN: Systematic review.
SETTING & POPULATION: Adults requiring maintenance hemodialysis.
SELECTION CRITERIA: All randomized controlled trials and trial protocols reporting vascular access outcomes identified from ClinicalTrials.gov, Embase, MEDLINE, and the Cochrane Kidney and Transplant Specialized Register from January 2011 to June 2016.
INTERVENTIONS: Any hemodialysis-related intervention.
OUTCOMES: The frequency and characteristics of vascular access outcome measures were analyzed and classified.
RESULTS: From 168 relevant trials, 1,426 access-related outcome measures were extracted and classified into 23 different outcomes. The 3 most common outcomes were function (136 [81%] trials), infection (63 [38%]), and maturation (31 [18%]). Function was measured in 489 different ways, but most frequently reported as "mean access blood flow (mL/min)" (37 [27%] trials) and "number of thromboses" (30 [22%]). Infection was assessed in 136 different ways, with "number of access-related infections" being the most common measure. Maturation was assessed in 44 different ways at 15 different time points and most commonly characterized by vein diameter and blood flow. Patient-reported outcomes, including pain (19 [11%]) and quality of life (5 [3%]), were reported infrequently. Only a minority of trials used previously standardized outcome definitions.
LIMITATIONS: Restricted sampling frame for feasibility and focus on contemporary trials.
CONCLUSIONS: The reporting of access outcomes in hemodialysis trials is very heterogeneous, with limited patient-reported outcomes and infrequent use of standardized outcome measures. Efforts to standardize outcome reporting for vascular access are critical to optimizing the comparability, reliability, and value of trial evidence to improve outcomes for patients requiring hemodialysis.

Matched MeSH terms: Equipment Failure/statistics & numerical data*