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Executive Functions Evaluation through Evoked Potentials among Children with Obsessive-Compulsive Disorder
Tatjana Zorcec , Nada Pop-Jordanova
Journal of Special Education and Rehabilitation , 2011, DOI: 10.2478/v10215-011-0004-8
Abstract: Introduction: Obsessive-compulsive disorder [OCD] is characterized by repetitive, disturbing obsessions and/or compulsions. Obsessions are thoughts, images or feelings which are unwanted, persistent and recurrent. Compulsions are repetitive and ritual motor acts which are performed to decrease the anxiety level caused by repetitive obsessions. The onset of the OCD is typically during adolescence or early adulthood. Its prevalence among children is from 1% to 3% and it appears to be more present among boys than girls. Nowadays, the most effective way to treat OCD is to combine psychopharmacological with cognitivebehavioral treatment strategies. In the past decades researchers were more involved in investigating the role of the executive functions [EF] in psychiatric disorders. Aim of the study: to investigate EF among children with OCD by using Event Related Potentials (ERPs) on the Go/NoGo tasks. Subjects and methods: The sample is comprised of 20 children from both genders, between seven and 14 years of age [M=10,33±1,83], all diagnosed with OCD. Psychological evaluation was performed with Child Behavior Check List, Kohs cubes for assessment of the intellectual capacities, Beck Depression Inventory, The Schedule for Affective Disorders and Schizophrenia for School-Age Children, Stroop Color Word Test and Wisconsin Card Sorting Test. Neuropsychological evaluation was performed with the Visual Continuous Performance Test [VCPT] from which the Event Related Potentials [ERP] components were extracted. Results: There is a clear presence of obsessions and/or compulsions, absence of symptoms of depression, presence of perseverative errors and mild difficulties in mental flexibility. The ERP results cannot be understood as a disturbance of the EF in a direct sense, rather than as a disturbed normal functioning caused by the high anxiety level. Conclusion: There is no significant clinical manifestation of cognitive dysfunction among children with OCD in the early stage of the disorder, but it could be expected the same one to be appearing in the later stages of the disorder.
EXECUTIVE FUNCTIONS EVALUATION PERFORMED BY EVENT RELATED POTENTIALS INCHILDREN WITH OBSESSIVE-COMPULSIVE DISORDER
Tatjana ZORCEC,Nada POP-JORDANOVA
Journal of Special Education and Rehabilitation , 2011,
Abstract: Introduction: Obsessive-compulsive disorder [OCD] is characterized by repetitive, disturbing obsessions and/or compulsions. Obsessions are thoughts, images or feelings which are unwanted, persistent and recurrent. Compulsions are repetitive and ritual motor acts which are performed to decrease the anxiety level caused by repetitive obsessions. The onset of the OCD is typically during adolescence or early adulthood. Its prevalence among children is from 1% to 3% and it appears to be more present among boys than girls. Nowadays, the most effective way to treat OCD is to combine psychopharmacological with cognitive-behavioral treatment strategies. In the past decades researchers were more involved in investigating the role of the executive functions [EF] in psychiatric disorders.Aim of the study: to investigate EF among children with OCD by using Event Related Potentials (ERPs) on the Go/NoGo tasks. Subjects and methods: The sample is comprised of 20 children from both genders, between seven and 14 years of age [М=10,33±1,83], all diagnosed with OCD. Psychological evaluation was performed with Child Behavior Check List, Kohs cubes for assessment of the intellectual capacities, Beck Depression Inventory, The Schedule for Affective Disorders and Schizophrenia for School-Age Children, Stroop Color Word Test and Wisconsin Card Sorting Test. Neuropsychological evaluation was performed with the Visual Continuous Performance Test [VCPT] from which the Event Related Potentials [ERP] components were extracted.Results: There is a clear presence of obsessions and/or compulsions, absence of symptoms of depression, presence of perseverative errors and mild difficulties in mental flexibility. The ERP results cannot be understood as a disturbance of the EF in a direct sense, rather than as a disturbed normal functioning caused by the high anxiety level.Conclusion: There is no significant clinical manifestation of cognitive dysfunction among children with OCD in the early stage of the disorder, but it could be expected the same one to be appearing in the later stages of the disorder.
QEEG characteristics and spectrum weighted frequency for children diagnosed as autistic spectrum disorder
Pop-Jordanova Nada,Zorcec Tatjana,Demerdzieva Aneta,Gucev Zoran
Nonlinear Biomedical Physics , 2010, DOI: 10.1186/1753-4631-4-4
Abstract: Background Autistic spectrum disorders are a group of neurological and developmental disorders associated with social, communication, sensory, behavioral and cognitive impairments, as well as restricted, repetitive patterns of behavior, activities, or interests. The aim of this study was a) to analyze QEEG findings of autistic patients and to compare the results with data base; and b) to introduce the calculation of spectrum weighted frequency (brain rate) as an indicator of general mental arousal in these patients. Results Results for Q-EEG shows generally increased delta-theta activity in frontal region of the brain. Changes in QEEG pattern appeared to be in a non-linear correlation with maturational processes. Brain rate measured in CZ shows slow brain activity (5. 86) which is significantly lower than normal and corresponds to low general mental arousal. Recent research has shown that autistic disorders have as their basis disturbances of neural connectivity. Neurofeedback seems capable of remediating such disturbances when these data are considered as part of treatment planning. Conclusions Prognosis of this pervasive disorder depends on the intellectual abilities: the better intellectual functioning, the possibilities for life adaptation are higher QEEG shows generally increased delta-theta activity in frontal region of the brain which is related to poor cognitive abilities. Brain rate measured in CZ shows slow brain activity related to under arousal. Pharmacotherapy combined with behavior therapy, social support and especially neurofeedback technique promise slight improvements
Characterization of Thin Films by Low Incidence X-Ray Diffraction  [PDF]
Mirtat Bouroushian, Tatjana Kosanovic
Crystal Structure Theory and Applications (CSTA) , 2012, DOI: 10.4236/csta.2012.13007
Abstract: Glancing Angle X-ray Diffraction (GAXRD) is introduced as a direct, non-destructive, surface-sensitive technique for analysis of thin films. The method was applied to polycrystalline thin films (namely, titanium oxide, zinc selenide, cadmium selenide and combinations thereof) obtained by electrochemical growth, in order to determine the composition of ultra-thin surface layers, to estimate film thickness, and perform depth profiling of multilayered heterostructures. The experimental data are treated on the basis of a simple absorption-diffraction model involving the glancing angle of X-ray incidence.
Axisymmetric Strain Stability in Sheet Metal Deformation  [PDF]
Tatjana V. Brovman
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.23016
Abstract: Production of axisymmetric pieces by technology of sheet metal drawing is widespread nowadays. So the calculation analysis of capacity and forces necessary for deformation is of special interest. The length of cylindrical pieces with axisymmetric deformation is limited by loss of stability and buckling due to the development of side strains. A new technological process is based on making considerable number of folds—18 - 26 with the amplitude of 0.8 - 0.9 mm— before the deformation or immediately after the partial one. That reduces the stiffness of billets and prevents from development of large size buckles. A new technological process is developed for producing a long run of high-quality products.
Development and Evaluation of the Posttraumatic Growth Status Inventory  [PDF]
Tatjana Alexander, Rainer Oesterreich
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.411120
Abstract:


Posttraumatic growth reflects beneficial psychological processes in persons with traumatic experiences. Existing measures of growth were criticized due to their retrospective self-report format that may cause biases in capturing the growth processes in individuals with several specific kinds of trauma, such as physical or psychological disabilities of close family members, bereavement and some others kinds of traumatic experience. In this case, the feelings of guilt may prevent the persons from being aware of the favorable personal changes. The objective of this study was to develop and to evaluate an alternative measuring instrument that uses a status quo response format instead of retrospective items and covers additional areas of growth-related changes. The samples comprised 440 adult persons with traumatic experience, including 181 parents of children with mental and/or physical disabilities. Exploratory and confirmatory factor analyses revealed a 7-factors solution, corresponding to the following subscales: Relationships to Others, New Possibilities, Personal Strength, Appreciation of Life, Spiritual Changes, Generativity, and Openness. Results showed good reliability and concurrent validity. The PGSI is recommended particularly for use in longitudinal studies as well as in samples of persons whose trauma relates to a severe psychological or physical disability in their families.


Sheet Bending Deformation in Production of Thin-Walled Pipes  [PDF]
Tatjana V. Brovman
World Journal of Mechanics (WJM) , 2014, DOI: 10.4236/wjm.2014.412035
Abstract: Nowadays, thin-walled super-diameter pipes are produced by the method of plastic bending of sheets. After a sheet is bent into a pipe and its ends are welded, a pipe billet is subjected to expansion deformation. The technology of forming end areas of a sheet is developed and formulaes forming forces equations are deduced. Experimental investigations of deformation are undertaken.
Raising a Child with Down Syndrome: Do Preferred Coping Strategies Explain Differences in Parental Health?  [PDF]
Tatjana Alexander, Julia Walendzik
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.71005
Abstract: The aim of this study was to determine coping strategies which may represent important personal resources and have a buffering effect in preventing mental health problems in parents of children with Down syndrome. Forty-nine parents of children with Down syndrome completed self-administrated measures of psychological and physical health problems, and coping behaviour, using several established measuring instruments. According to the hierarchical regression analyses, parents who often used regenerative coping strategies, and who experienced positive personal changes in terms of posttraumatic growth suffered from less anxiety and somatisation symptoms, whereas dysfunctional coping was the best predictor for parental depression and physical symptoms. Regenerative coping mediated between parental tendency to recognize their emotional needs and somatisation symptoms. Intervention programs for families of children with Down syndrome may benefit if they address parents’ reflection about their feelings, foster posttraumatic growth processes, and impart knowledge about long-term regenerative coping strategies.
Gene-Environment Interaction: A Genetic-Epidemiological Approach
Tatjana Pekmezovi
Journal of Medical Biochemistry , 2010, DOI: 10.2478/v10011-010-0021-z
Abstract: Classical epidemiology addresses the distribution and determinants of diseases in populations, and the factors associated with disease causation, with the aim of preventing disease. Both genetic and environmental factors may contribute to susceptibility, and it is still unclear how these factors interact in their influence on risk. Genetic epidemiology is the field which incorporates concepts and methods from different disciplines including epidemiology, genetics, biostatistics, clinical and molecular medicine, and their interaction is crucial to understanding the role of genetic and environmental factors in disease processes. The study of gene-environment interaction is central in the field of genetic epidemiology. Gene-environment interaction is defined as a different effect of an environmental exposure on disease risk in persons with different genotypes, or, alternatively, a different effect of a genotype on disease risk in persons with different environmental exposures. Five biologically plausible models are described for the relations between genotypes and environmental exposures, in terms of their effects on disease risk. Therefore, the study of gene-environment interaction is important for improving accuracy and precision in the assessment of both genetic and environmental factors, especially in disorders of less defined etiology. Genetic epidemiology is also applied at the various levels of disease prevention.
Homogeneous cones and abelian theorems
Tatjana Ostrogorski
International Journal of Mathematics and Mathematical Sciences , 1998, DOI: 10.1155/s0161171298000908
Abstract: This paper deals with analysis on homogeneous cones in ¢ n. This subject has its origins in one-dimensional topics that are connected, often implicitely, with some group properties. The homogeneous cones are open convex cones in ¢ n that are at the same time homogeneous spaces, and they are more general than the classical, or symmetric cones. As an example of application of the theory of homogeneous cones we study the asymptotic behaviour of some integral transforms.
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