ASME Soccer Robot- Group V

The ASME design challenge, featuring a soccer playing robot theme, was attempted and successfully completed. A robot was built that could move in all directions for translational motion, while a Foosball inspired kicking function completed the design

Weakly-supervised Semantic Segmentation in the Multi-class Setting across Different Image Domains

Weakly-supervised semantic segmentation from image-level annotations has been proposed for segmenting natural scene images and this performs well compared to full supervision with pixel-level annotations, which are harder and slower to obtain. However, this is a challenging problem because image labels lack location-specific information to learn object extents. Weakly-supervised semantic segmentation is unexplored in other image domains, such as histopathology and satellite imagery and it is unknown whether different methods are needed for these images. This thesis proposes a novel weakly-supervised semantic segmentation algorithm for histopathology images and explores its performance compared to state-of-the-art methods developed for natural scene images. The compatibility of each method for different image domains is analyzed and this thesis analyzes the effect of classification network choice, the self-supervised learning approach, and class co-occurrence on segmentation performance.M.A.S

Causative Factors for Complications in Transpalatal Advancement

Introduction: Transpalatal advancement (TPA) is a procedure that is used when modern variants of uvulopharyn-gopalatoplasty are unable to provide enough anterior traction. Although successful in reduction of obstructive sleep apnea (OSA) parameters, it also comes with procedure-specific risks. Formation of an oro-nasal fistula (ONF) is a complication that results in significant morbidity and a protracted treatment course. Methods: After approval from the University of Wollongong Health Research Ethics Committee, a retrospective chart review of all cases undergoing TPA performed by a single surgeon over a 10-year period from 2008 to 2018 was performed. Patients underwent pre- and postoperative level 1 or 2 polysomnography. Factors potentially contributing to palatal complications, as well as pre- and postoperative polysomnographic parameters, subjective sleep questionnaires, and body mass index (BMI) were statistically analyzed where a Pvalue Results: A total of 59 patients were included. Overall palatal complication rate was 25.4% (15/59), with the most common being transient velo-palatal insufficiency (VPI) (8/59, 13.6%). ONF developed in 4/59 (6.8%) of patients. None of the analyzed contributing factors for palatal complications were statistically significant, except the presence of a high-arched palate and development of ONF. All analyzed sleep parameters, as well as BMI, were significantly different when comparing pre- to postoperative results. Conclusion: This study suggests that TPA has a role in current sleep surgery paradigms and can significantly improve both objective and subjective outcome measures of OSA. Surgeons contemplating TPA on patients with high-arched hard palates should do so with caution

Causative Factors for Complications in Transpalatal Advancement

Introduction: Transpalatal advancement (TPA) is a procedure that is used when modern variants of uvulopharyn-gopalatoplasty are unable to provide enough anterior traction. Although successful in reduction of obstructive sleep apnea (OSA) parameters, it also comes with procedure-specific risks. Formation of an oro-nasal fistula (ONF) is a complication that results in significant morbidity and a protracted treatment course. Methods: After approval from the University of Wollongong Health Research Ethics Committee, a retrospective chart review of all cases undergoing TPA performed by a single surgeon over a 10-year period from 2008 to 2018 was performed. Patients underwent pre- and postoperative level 1 or 2 polysomnography. Factors potentially contributing to palatal complications, as well as pre- and postoperative polysomnographic parameters, subjective sleep questionnaires, and body mass index (BMI) were statistically analyzed where a P value Results: A total of 59 patients were included. Overall palatal complication rate was 25.4% (15/59), with the most common being transient velo-palatal insufficiency (VPI) (8/59, 13.6%). ONF developed in 4/59 (6.8%) of patients. None of the analyzed contributing factors for palatal complications were statistically significant, except the presence of a high-arched palate and development of ONF. All analyzed sleep parameters, as well as BMI, were significantly different when comparing pre- to postoperative results. Conclusion:This study suggests that TPA has a role in current sleep surgery paradigms and can significantly improve both objective and subjective outcome measures of OSA. Surgeons contemplating TPA on patients with high-arched hard palates should do so with caution

Atypical Pharyngeal Pouch Arising Bilaterally between the Hyoid Bone and Thyroid Cartilage

Introduction. Pharyngoesophageal diverticuli are a common cause of dysphagia; they are associated with various morbidities and a decreased quality of life. There are several different types of the diverticuli, and they are divided based on the anatomical location of origin relative to the cricopharyngeal muscle; these include Zenker’s, Killian-Jamieson’s, and Laimer’s diverticula. The authors present a unique case of pharyngoesophageal diverticulum that has not been previously described. Case Presentation. A 65-year-old male presented with a 12-month history of dysphagia and odynophagia for solids. Barium swallow revealed bilateral moderately sized diverticuli that altered in size during the different phases of swallow. CT scan of the neck with oral contrast further identified the anatomy of the diverticuli, arising between the hyoid bone and thyroid cartilage. Discussion. An external transcervical approach was utilised to successfully repair the diverticuli. Subsequent cricopharyngeal spasm was treated with botulinum toxin, and the patient recovered with no ongoing symptoms. The barium swallow study is a commonly utilised initial investigation as it is easy to perform and safe and has good diagnostic value. Definitive management usually involves either endoscopic or open surgery. This case depicts a unique case of a pharyngeal diverticulum arising between the hyoid bone and thyroid cartilage

Skin excisions: not so simple for the regionally based general surgical trainee

Background: In the regional setting, general practitioners often refer complicated skin excisions to general surgery, whereas in larger centres this is the domain of plastic surgery. General surgical trainees often do not have adequate exposure to complex skin excisions prior to placement in regional centres. Objective: To explore what factors affected positive margin rates in surgical registrars in a regional setting. Design: Retrospective audit. Setting: Large teaching hospital (referral centre). Participants: All skin lesions excised under local anaesthetic by registrars at a single referral centre over a 30-month period from 2007 to mid 2009, of these only basal cell carcinomas (BCC) and squamous cell carcinomas (SCC) were analysed. Results: Registrars excised a total of 703 skin lesions, 314 (43.4%) were BCC or SCC, and of these 50 (15.9%) had positive margins. Repeated measures multivariable logistic regression was performed on relevant data. Surgical registrars had significantly higher positive margin rates when operating unsupervised (P=0.014). Although not significant, there was a tendency for BCC excisions to have positive margins (P=0.059). There was no statistical difference when comparing lesions excised on the head compared to body, use of a graft/flap or registrar training level. Conclusion: This study's positive margin rate of 15.9% falls within the range reported in the literature (0.7% to 20.7%); however, this has the potential to be further reduced. Surgical registrars excising skin lesions in regional centres, regardless of level of training, should have closer supervision. Regular surgical audit should be done so registrars can have early feedback on performance. © 2011 The Authors. Australian Journal of Rural Healt

Sinus Irrigation Penetration After Proposed Modified Draf IIa Technique in a Side-to-Side Cadaveric Model

Background Endoscopic sinus surgery (ESS) is an effective intervention for patients with medically refractory chronic rhinosinusitis. Frontal sinusotomy is the most challenging part of ESS, with one of the key outcomes being access for topical irrigations. Objective The purpose of this study is to compare irrigation penetration into the frontal sinus following Draf IIa versus modified Draf IIa frontal sinusotomy. Methods Four fresh cadaver heads were used in this experiment. Draf IIa was performed on one side of each head and a modified Draf IIa on the contralateral side. This proposed modification consists of a Draf IIa combined with an agger nasi punch-out procedure and partial trimming of the vertical lamella of the middle turbinate back to the posterior table of the frontal sinus without drilling the beak. Each head was irrigated with methylene blue-dyed water and recorded by rigid endoscopy through an endonasal view (EV) of the frontal sinus and frontal trephination view (TV). Two blinded rhinologists scored the extent of staining (using an ordinal scale of 0 to 3) for each side. A case report where the modified Draf IIa was performed is also described. Results After modified Draf IIa sinuosotomy, the mean score for the EV was 2.125 and for the TV was 2, versus 0.875 and 0.625 for traditional Draf IIa, respectively. There was a statistically significant increase for both EV (p = 0.019) and TV (p = 0.018) after modified Draf IIa. Conclusion In our cadaveric model, this procedural modification improved penetration of postoperative irrigations into the frontal sinus. This simple technique may be easily adapted into frontal ESS when indicated