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Search Results: 1 - 8 of 8 matches for " Hasti Ziaimatin "
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Semantic and Time-Dependent Expertise Profiling Models in Community-Driven Knowledge Curation Platforms
Hasti Ziaimatin,Tudor Groza,Jane Hunter
Future Internet , 2013, DOI: 10.3390/fi5040490
Abstract: Online collaboration and web-based knowledge sharing have gained momentum as major components of the Web 2.0 movement. Consequently, knowledge embedded in such platforms is no longer static and continuously evolves through experts’ micro-contributions. Traditional Information Retrieval and Social Network Analysis techniques take a document-centric approach to expertise modeling by creating a macro-perspective of knowledge embedded in large corpus of static documents. However, as knowledge in collaboration platforms changes dynamically, the traditional macro-perspective is insufficient for tracking the evolution of knowledge and expertise. Hence, Expertise Profiling is presented with major challenges in the context of dynamic and evolving knowledge. In our previous study, we proposed a comprehensive, domain-independent model for expertise profiling in the context of evolving knowledge. In this paper, we incorporate Language Modeling into our methodology to enhance the accuracy of resulting profiles. Evaluation results indicate a significant improvement in the accuracy of profiles generated by this approach. In addition, we present our profile visualization tool, Profile Explorer, which serves as a paradigm for exploring and analyzing time-dependent expertise profiles in knowledge-bases where content evolves overtime. Profile Explorer facilitates comparative analysis of evolving expertise, independent of the domain and the methodology used in creating profiles.
Study of Impact of Mobile Ad hoc Networking and its Future Applications
Ashema Hasti
BVICAM's International Journal of Information Technology , 2012,
Abstract: Today, many people carry numerous portable devices, such as laptops, mobile phones, PDAs and mp3 players, for use in their professional and private lives. For the most part, these devices are used separately-that is, their applications do not interact. Imagine, however, if they could interact directly: participants at a meeting could share documents or presentations; all communication could automatically be routed through the wireless corporate campus network. These examples of spontaneous, ad hoc wireless communication between devices might be loosely defined as a scheme, often referred to as ad hoc networking, which allows devices to establish communication, anytime and anywhere without the aid of a central infrastructure. This paper describes the concept of mobile ad hoc networking (MANET) and points out some of its applications that can be envisioned for future. Also, the paper presents two of the technical challenges MANET poses, which include Geocasting and QoS.
Expressive Animated Character Sequences Using Knowledge-Based Painterly Rendering
Hasti Seifi,Steve DiPaola,Ali Arya
International Journal of Computer Games Technology , 2011, DOI: 10.1155/2011/164949
Abstract: We propose a technique to enhance emotional expressiveness in games and animations. Artists have used colors and painting techniques to convey emotions in their paintings for many years. Moreover, researchers have found that colors and line properties affect users' emotions. We propose using painterly rendering for character sequences in games and animations with a knowledge-based approach. This technique is especially useful for parametric facial sequences. We introduce two parametric authoring tools for animation and painterly rendering and a method to integrate them into a knowledge-based painterly rendering system. Furthermore, we present the results of a preliminary study on using this technique for facial expressions in still images. The results of the study show the effect of different color palettes on the intensity perceived for an emotion by users. The proposed technique can provide the animator with a depiction tool to enhance the emotional content of a character sequence in games and animations. 1. Introduction The expressiveness of character-based animations heavily relies on their success in conveying emotions to their viewers. In order to achieve high levels of expressiveness, today's game character sequences not only rely on the animation techniques, but also on other elements such as lighting and scene composition. The latter not only enhances the emotional content of the scene, but also draws attention to the specific regions designed for conveying the message. In a similar way, painters use color, various brush strokes, and painting techniques to emphasize certain features of a scene while leaving out unnecessary details. Edward Munch and Vincent Van Gogh are two exemplary artists that used colors to depict emotions in their work [1]. The use of texture for inducing mood is also evident in different brush stroke styles used by artists [2]. The emotional effects of art and paintings on users point to the importance of visual style on users' perception and emotional responses. Some past psychological studies demonstrated that there are links between rendering style and one's perception and feelings about a rendered object [3–5]. Furthermore, some other studies investigated people's association between colors and emotion [1, 5, 6]. Painterly rendering, a subset of Nonphotorealistic Rendering (NPR) simulates the work of illustrators and portrait artists and is commonly reported as an expressive style [7–9]. We propose using the expressive style of painterly rendering to enhance the emotional content of facial character sequences in games
Perception of Motion and Architectural Form: Computational Relationships between Optical Flow and Perspective
Arash Sangari,Hasti Mirkia,Amir H. Assadi
Computer Science , 2011,
Abstract: Perceptual geometry refers to the interdisciplinary research whose objectives focuses on study of geometry from the perspective of visual perception, and in turn, applies such geometric findings to the ecological study of vision. Perceptual geometry attempts to answer fundamental questions in perception of form and representation of space through synthesis of cognitive and biological theories of visual perception with geometric theories of the physical world. Perception of form, space and motion are among fundamental problems in vision science. In cognitive and computational models of human perception, the theories for modeling motion are treated separately from models for perception of form.
ATM Gene Mutations Detection in Iranian Ataxia-Telangiectasia Patients
Toshio Miyawaki,Behnaz Bayat,Ahmad Aleyasin,Hasti Atashi Shirazi
Iranian Journal Of Allergy, Asthma and Immunology , 2004,
Abstract: Ataxia-Telangiectasia (AT) is an autosomal recessive disorder involving cerebellar degeneration, immunodeficiency, radiation sensitivity and cancer predisposition. The ATM gene on human chromosome 11q22.3 has recently been identified as the gene responsible for ataxia-telangiectasia (AT). The gene mutated in AT, which has been designated as the ATM gene, encodes a large protein kinase with a PI-3 kinase-related domain. More than 100 mutations are broadly distributed throughout the ATM gene. The large size of the ATM gene (66 exons spanning ~150kb of genomic DNA) together with the diversity and broad distribution of mutations in AT patients, greatly limits the utility of direct mutation screening as a diagnostic tool. In this study, 20 families with at least one affected child clinically suspected to have ataxia-telagiectasia were examined and their DNA was extracted and amplified with standard methods. Sequencing methods were used to detect the new point mutation. Four exons which were hot spots for point mutations in ATM gene were detected by PCR-SSCP or PCR-RFLP.
An overview of a diagnostic and epidemiologic reappraisal of cutaneous leishmaniasis in Iran
Farahmand, Mahin;Nahrevanian, Hossein;Shirazi, Hasti Atashi;Naeimi, Sabah;Farzanehnejad, Zahra;
Brazilian Journal of Infectious Diseases , 2011, DOI: 10.1590/S1413-86702011000100004
Abstract: cutaneous leishmaniasis (cl) is a widespread tropical infection which has a high incidence rate in iran. leishmania tropica, the causative agent of anthroponotic cutaneous leishmaniasis (acl), and leishmania major, which causes zoonotic cutaneous leishmaniasis (zcl), are endemic in various parts of iran with a high incidence rate. the aim of this study was to evaluate the reappraisal of the diagnosis and epidemiology of cl in iran, by different clinical, parasitological and molecular assays among patients suspected of cl referred to the department of parasitology, at the pasteur institute of iran during 2006-2009. two hundred samples from patients with ulcerative skin lesions were collected, clinical analyses were applied, data questionnaire was completed and samples were examined for cl by using both direct microscopic and culture methods. moreover, pcr assay was applied for detection of leishmania species in cl isolates resulting from parasitological assay. clinical observation revealed that the majority (58%) of lesions was single; double lesions were observed in 22% of patients, and only 20% of cl had multiple lesions. out of 200 patients, leishman body was observed in 77 samples (38.5%) by direct smear and 40% by cultivation assay. most patients (21.3%) had a travel history to the isfahan province, one of the most important endemic areas of cl located in center of iran. pcr assay by kdna indicated 32 and 18 out of 50 isolates respectively had similar patterns with standard l. major and l. tropica. in conclusion, clinical manifestations and an appropriate diagnostic assay with a parallel molecular characterization of cl may lead to a screening evaluation of disease, prognosis, treatment and control strategies.
Assessment of nutritional parameter outcome in laryngeal cancer patients undergoing laryngectomy
Mohamad Taghi Khorsandi Ashtiani,Nasrin Yazdani,Seyedeh Hasti Borghei,Hedayat Dehghani
Iranian Journal of Otorhinolaryngology , 2010,
Abstract: Introduction: Laryngectomy in patients with laryngeal cancer can lead to the reduction of nutritional parameters. Supportive treatments and supplementary nutritional supports are recommended in all patients undergoing laryngectomy, even with acceptable preoperative nutritional indices.The aim of this study was to evaluate postoperative changes in nutritional parameters in patients with laryngeal cancer undergoing laryngectomy. Materials and Methods: In a prospective study from 2005 to 2007, 30 candidate patients for total laryngectomy in Amir Alam Hospital in Tehran were included for final diagnosis of squamous cell carcinoma (stage T4). Nutritional parameters including body mass index (BMI), serum levels of albumin, hemoglobin, total protein concentration, total lymphocyte number and percentage were assessed one week before and one month after laryngectomy. All patients used their routine dietary regimens and those who received nutritional supplementation after surgery were excluded from the study. Results: Except for white blood cell count, a significant reduction was found in BMI, lymphocyte count, serum hemoglobin, total protein and albumin levels after surgery (P
Reliability and Validity of the Persian Version of the Fatigue Severity Scale in Idiopathic Parkinson’s Disease Patients
Seyed-Mohammad Fereshtehnejad,Hasti Hadizadeh,Farzaneh Farhadi,Gholam Ali Shahidi,Ahmad Delbari,Johan L?kk
Parkinson's Disease , 2013, DOI: 10.1155/2013/935429
Abstract: As one of the most frequent symptoms, measurement of fatigue is an issue of interest in Parkinson’s disease (PD). The fatigue severity scale (FSS) is one of the recommended questionnaires for this purpose. The aim of our study was to evaluate psychometric properties of the Persian version of the FSS (FSS-Per) to assess fatigue in PD patients. Ninety nondemented idiopathic Parkinson’s disease (IPD) patients were consecutively recruited from an outpatient referral movement disorder clinic. In addition to the disease severity scales, the FSS-Per was used for fatigue measurement. The internal consistency coefficient was larger than 0.8 for all of the items with a total Cronbach’s alpha of 0.96 (95% CI: 0.95–0.97). The FSS-Per score correlated with the UPDRS score ( , ) and the “Hoehn and Yahr” (HY) stage ( , ). The total score of the FSS-Per significantly discriminated IPD patients with more severe disability (HY stage > 2) versus those with less severe disease (HY stage ) (AUC = 0.81 (95% CI: 0.72–0.90)). The FSS-Per fulfilled a high internal consistency and construct validity to measure the severity of fatigue in Iranian IPD patients. These acceptable psychometric properties were reproducible in subgroups of IPD patients regarding different levels of education, disease severity, sex and age groups. 1. Introduction Fatigue is one of the most disabling nonmotor symptoms of Parkinson’s disease (PD) [1]. It has been defined as a feeling of abnormal and overwhelming tiredness and shortage of energy, which is distinct from normal tiredness both in quality and quantity [2]. Because of its multidimensionality and lack of a universal definition, there are a large number of questionnaires measuring different aspects of fatigue [3]. However, there is no single multidimensional questionnaire, validated in patients with PD [3]. Based on a review done by the International Movement Disorders Society (IMDS), only a few scales are recommended for measuring fatigue severity in PD, one of which is the fatigue severity scale (FSS) [4]. The FSS is a self-report, one-dimensional scale, which was primarily developed in 1989 for patients with multiple sclerosis [5]. This scale does not specifically measure cognitive fatigue [6] and contains nine brief items, each of which is graded from 1 (strong disagreement) to 7 (strong agreement) [5]. Although many studies have previously shown the clinimetric properties of the FSS in different chronic diseases [5, 7–11], there are few validation reports in PD. On the other hand, even though the FSS has been validated in different languages,
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