Applications of Factorization Theorem and Ontologies for Activity ModelingRecognition and Anomaly Detection

In this thesis two approaches for activity modeling and suspicious activity detection are examined. First is application of factorization theorem extension for deformable models in two dierent contexts. First is human activity detection from joint position information, and second is suspicious activity detection for tarmac security. It is shown that the first basis vector from factorization theorem is good enough to dierentiate activities for human data and to distinguish suspicious activities for tarmac security data. Second approach dierentiates individual components of those activities using semantic methodol- ogy. Although currently mainly used for improving search and information retrieval, we show that ontologies are applicable to video surveillance. We evaluate the domain ontologies from Challenge Project on Video Event Taxonomy sponsored by ARDA from the perspective of general ontology design principles. We also focused on the eect of the domain on the granularity of the ontology for suspicious activity detection

The Evaluation of Sexual Problems and Influencing Factors in Behçet’s Disease

Objectives: The prevalence of sexual dysfunction in Behcet patients, patients' practices toward sexual problems, pre-disease sexual life and distribution of post-disease sexual problems were evaluated. Patients and Methods: Sexually active 96 patients were included to the study. The data were collected with the "Sexual Problems in Behcet Patients Data Collection Form" and "Arizona Sexual Experience Scale (ASES)". The scale's score interval is 5-30; 11-above scores indicate sexual dysfunction. Results: Of the patients, 51 (53.1%) were 40-year-old and above, 49 (51%) were women; the most frequent symptoms were oral aphtosis (58.3%), genital ulcers (31.2%), and erythema nodosum (28.1%). Mean ASES score was 14.2+/-5.8 66 patients (68.7%) had sexual dysfunction. The most prevalent problems were decreased frequency of intercourse (n=32, 86.5%), painful sexual relation (n=18, 48.6%) and unwillingness (n=9, 24.3%). Most of the patients (n=15, 40.5%) who expressed sexual problems were not using any practice for the solution. None of the patients received any information about sexual problem and the most preferenced source of information would be the doctors (n=83, 86.4%) in case having this opportunity. Female gender and the belief about the impact of Behcet's disease on sexual life determined ASES score (43%). Conclusion: Sexual dysfunction in Behcet's disease was seen in a significant proportion.WoSScopu

Activity Representation Using 3D Shape Models

We present a method for characterizing human activities using 3D deformable shape models. The motion trajectories of points extracted from objects involved in the activity are used to build models for each activity, and these models are used for classification and detection of unusual activities. The deformable models are learnt using the factorization theorem for nonrigid 3D models. We present a theory for characterizing the degree of deformation in the 3D models from a sequence of tracked observations. This degree, termed as deformation index (DI), is used as an input to the 3D model estimation process. We study the special case of ground plane activities in detail because of its importance in video surveillance applications. We present results of our activity modeling approach using videos of both high-resolution single individual activities and ground plane surveillance activities

Combining conventional technique with fluoroscopy integration module in accessory pathway ablation

Introduction: Accessory pathway (AP) ablation is a straightforward approach with high success rates, but the fluoroscopy time (FT) is significantly longer in conventional technique. Electroanatomical mapping systems (EMS), reduce the FT, but anatomical and activation mapping may prolong the procedure time (PT). The fluoroscopy integration module (FIM) uses prerecorded fluoroscopy images and allows ablation similar to conventional technique without creating an anatomical map. In this study, we investigated the effects of combining the FIM with traditional technique on PT, success, and radiation exposure. Methods: A total of 131 patients who had undergone AP ablation were included in our study. In 37 patients, right and left anterior oblique (RAO-LAO) images were acquired after catheter placement and integrated with the FIM. The ablation procedure was then similar to the conventional technique, but without the use of fluoroscopy. For the purpose of acceleration, anatomical and activation maps have not been created. Contact-force catheters were not used. 94 patients underwent conventional ablation using fluoroscopy only. Results: FIM into AP ablation procedures led to a significant reduction in radiation exposure, lowering FT from 7.4 to 2.8 min (p <.001) and dose-area product from 12.47 to 5.8 μGym² (p <.001). While the FIM group experienced a reasonable longer PT (69 vs. 50 min p <.001). FIM reduces FT regardless of operator experience and location of APs. Conclusion: Combining FIM integration with conventional AP ablation offers reduced radiation exposure without compromising success rates and complication

Comparison of electrophysiological characteristics of right- and left-sided Mahaim-type accessory pathways

Aims: Mahaim-type accessory pathways (MAPs) are generally right-sided due to the embryological differentiation, but left-sided localization is also possible. This study aims to compare the clinical and electrophysiological characteristics of right- and left-sided MAPs