Rigid tool affordance matching points of regard

In this abstract we briefly introduce the analysis of simple rigid object affordance by experimentally establishing the relation between the point of regard of subjects before grasping an object and the finger tip points of contact once the object is grasped. The analysis show that there is a strong relation between these data, in so justifying the hypothesis that people figures out how objects are afforded according to their functionality

Bayesian non-parametric inference for manifold based MoCap representation

We propose a novel approach to human action recognition, with motion capture data (MoCap), based on grouping sub-body parts. By representing configurations of actions as manifolds, joint positions are mapped on a subspace via principal geodesic analysis. The reduced space is still highly informative and allows for classification based on a non-parametric Bayesian approach, generating behaviors for each sub-body part. Having partitioned the set of joints, poses relative to a sub-body part are exchangeable, given a specified prior and can elicit, in principle, infinite behaviors. The generation of these behaviors is specified by a Dirichlet process mixture. We show with several experiments that the recognition gives very promising results, outperforming methods requiring temporal alignment

Component-wise modeling of articulated objects

We introduce a novel framework for modeling articulated objects based on the aspects of their components. By decomposing the object into components, we divide the problem in smaller modeling tasks. After obtaining 3D models for each component aspect by employing a shape deformation paradigm, we merge them together, forming the object components. The final model is obtained by assembling the components using an optimization scheme which fits the respective 3D models to the corresponding apparent contours in a reference pose. The results suggest that our approach can produce realistic 3D models of articulated objects in reasonable time

Collaborative Activities Understanding from 3D Data

Our work consists in finding a way to recognize activities performed by two people that collaborate in a working environment. Starting from results obtained in the past years by Gong, Medioni and other authors, we go a step forward, trying to construct a learning function that is able to generalize the model provided by the authors cited before. Moreover, we search for a space in which we can map the points corresponding to the poses, over time, of the skeletons of the two subjects, so that no information is lost

Single image object modeling based on BRDF and r-surfaces learning

A methodology for 3D surface modeling from a single image is proposed. The principal novelty is concave and specular surface modeling without any externally imposed prior. The main idea of the method is to use BRDFs and generated rendered surfaces, to transfer the normal field, computed for the generated samples, to the unknown surface. The transferred information is adequate to blow and sculpt the segmented image mask in to a bas-relief of the object. The object surface is further refined basing on a photo-consistency formulation that relates for error minimization the original image and the modeled object

Chimney endovascular aneurysm repair-induced mesenteric ischemia: A report of an extremely rare complication

The chimney endovascular aneurysm repair (Ch-EVAR) technique has progressively increased in popularity in the treatment of complex aortic aneurysms. However, the long-term results of this technique still must be assessed, especially in comparison to custom-made solutions. The patency of chimney grafts has always been one of the important issues with the Ch-EVAR technique. However, interactions between nonstented aortic side branches and chimney stent grafts have rarely been discussed. In the present case report, we describe a rare case of mesenteric ischemia due to superior mesenteric artery ostium coverage by the misalignment of a renal stent graft in a Ch-EVAR

Open surgical treatment of total occlusions of the abdominal aorta

Objectives: To analyze the perioperative results and long-term follow-up of open surgery among patients with a total chronic occlusion of the abdominal aorta. Material and methods: The data from 87 consecutive patients treated by open surgery for a total occlusion of the abdominal aorta in our center between 1998 and 2018 were collected prospectively. Thirty-nine patients presented a distal infrarenal aortic occlusion and 48 a proximal juxta/suprarenal occlusion. A thrombosed infrarenal aneurysm was associated in five cases. In eight cases a previous endovascular approach failed. 48 patients had an aorto-bifemoral bypass, 15 patients had a thrombo-endarterectomy and an enlargement angioplasty, and 24 patients had an extra-anatomical bypass (including 20 cases with axillo-bifemoral bypass and four cases of thoraco-bifemoral bypass). A suprarenal clamping was necessary in 28 cases (32.2%) of abdominal aortic surgery. Two cases required an aorto-renal bypass for aortic lesions extending up to the ostium of a renal artery. One case required a bypass to treat a preexistent occlusion of the superior mesenteric artery. Results: Perioperative morbidity included cardiac (3.4%) and respiratory (2.3%) complications, as well as acute impaired renal function (2.3%). The significant renal complications were reported only in case of suprarenal crossclamping. After an average follow-up of 74 months we observed primary and secondary patency rates of 94.3%, 92% and 88.5% at 12, 24, and 36 months, respectively. In the cases treated by thrombo-endarterectomy and enlargement angioplasty there was no arterial thrombosis. In the patients with a preoperative renal malperfusion we observed an improvement of the renal function and of the control of arterial hypertension or visceral ischemic symptomatology in all the cases. Conclusion: Open surgical treatment of the total occlusions of the abdominal aorta offers an acceptable rate of mortality and morbidity and an excellent long term patency especially in the cases of direct aortic surgery. In the event of a proximal obstruction the need for a suprarenal clamping and repair of the renal arteries is often necessary

Severe local wound infections after vascular exposure in the groin and other body areas: Prevention, treatment and prognosis

Severe surgical site infections (SSIs) are a frequent nosocomial complication after vascular interventions, an important cause of postoperative morbidity, and a substantial burden to the health care system. Patients undergoing arterial interventions are at elevated risk of SSIs, possibly because of the presence of several risk factors in this patient population. In this review, we examined the available clinical evidence for the prevention, treatment, and prognostication of postoperative severe SSIs after vascular exposure in the groin and other body areas. Results from studies evaluating preoperative, intraoperative, and postoperative preventive strategies and several treatment options are reviewed. In addition, risk factors for surgical wound infections are analyzed in detail and related evidence from the literature is highlighted. Although several measures have been implemented over the time to prevent them, SSIs continue to pose a substantial health care and socioeconomic challenge. Therefore, strategies to decrease the risk and improve the treatment of SSIs for the highrisk vascular patient population should be the focus of continuing improvement and critical review. This review aimed at identifying and reviewing the current evidence for preventing, treating, and performing stratification according to the prognosis of postoperative severe SSIs after vascular exposure in the groin and other body areas. & COPY; 2023 Elsevier Inc. All rights reserved