Işık University Institutional Repository
Digitally stores academic resources such as books, articles, dissertations, bulletins, reports, research data published directly or indirectly by İbn Haldun University at international standards, helps track the academic performance of the university, provides long term preservation for resources and makes publications available to Open Access in accordance with their copyright to increase the effect of publications.
Recent Submissions
Decision making, emotion recognition and childhood traumatic experiences in murder convicts ımprisoned with aggravated life sentence: a prison study
(Turkish Neuropsychiatric Society, 2025-03)
Introduction: Decision-making and emotion recognition are two fundamental themes in social cognition. Disorders in these areas can lead to interpersonal, psychosocial, and legal problems for the individual and society. The likelihood of consequent aggression and crime makes them foci of forensic psychiatry over time. In this study, two developmental disorders that have a clear relationship with crime, that are antisocial personality disorder (ASPD), and psychopathy are investigated for their relationship with these social cognitive deficits.Methods: The present study involved 23 male prison inmates who were diagnosed with both antisocial personality disorder and psychopathy, as well as 23 control participants who were matched for age, gender, and level of education. Following the psychiatric interview, Reading the Mind in the Eyes Test (RMET), the Iowa Gambling Test (IGT), Toronto Alexithymia Scale (TAS), Defense Styles Questionnaire (DSQ), Childhood Psychic Trauma Scale (CTQ), Hare Psychopathy Checklist (PCL-R) were administered to all participants. Results: The results of the study showed that ASPD group performed statistically worse than healthy controls in TAS, CTQ, all items of DSQ, PCL-R Factor 1 and 2, and all the IGT scores (p<0.05). There were no statistically significant difference between in the RMET test performancesConclusion: These results suggest that ASPD and psychopathy lead to impaired decision-making behaviors due to the inability to recognize one’s own emotions and impulsivity, and that these characteristics play a critical role in the criminal behavior of individuals. In addition, contrary to expectations, the results of affective theory of mind assessed with the RMET showed similar characteristics in homicide convicts and healthy controls. These data indicate the need for further research in the field of forensic psychiatry.
Design and control of high-frequency buck converter fed six-step drive for air-core PMSM
(Institute of Electrical and Electronics Engineers Inc., 2025-02)
Air-core permanent magnet synchronous motors (PMSMs) machines are becoming known for their higher efficiency, lighter weight designs, and superior performance compared to widely utilized induction motors (IMs). They hold great potential for diverse industrial applications. However, effectively harnessing this potential requires overcoming drive hardware and control challenges. This research introduces a silicon carbide (SiC)-based two-phase interleaved buck-converter-fed quasi-current source inverter (quasi-CSI) drive tailored for driving low-inductance air-core PMSMs which is ideal for heavy-duty fan and pump applications. Operating in the discontinuous current mode (DCM) with an effective switching frequency of 1 MHz, this drive is designed to address efficiency and the very low-cost market constraints while simultaneously reducing control complexity an issue associated with its high switching frequency. The article also analyzes two critical control challenges of mitigating high current spikes due to air-core machines' low inductance and finding solutions to overcome microcontroller resource limitations when executing time-critical functions within interrupt subroutines (ISRs). The culmination of this work is a 300 V dc-bus and five-horsepower electric drive prototype with closed-loop speed control. Experimental results illustrate a 2% enhancement in overall efficiency compared to conventional induction machine (IM) drives in similar applications (e.g., fan and pump) and ratings, alongside a significant 50% reduction in drive volume.
A practical control method for single-phase input PMSM drives with small DC-Link capacitor
(Institute of Electrical and Electronics Engineers Inc., 2025-03)
The primary function of the large electrolytic dc-link capacitor in the single-phase input motor drives is to enhance dc voltage stability by minimizing voltage fluctuations. Because they are both bulky and unreliable components, reducing the size of dc-link capacitors or substituting them with significantly low capacitance value film capacitors offers numerous advantages. This article introduces a method that allows using a voltage source inverter with a small film dc-link capacitor, which results in equivalent performance to high-value capacitor drives. In this approach, the effect of dc-link voltage ripple is designed as a periodic disturbance in the current loop. A proportional-integral-resonant (PIR) control strategy is implemented to eliminate the designed double-line frequency disturbance observed in motor currents, thereby ensuring a smooth motor torque response. This solution meets crucial criteria for home appliances, specifically addressing input current harmonic requirements through power factor correction while effectively reducing the adverse effects of substantial dc-link ripple on motor torque, even when employing a film capacitor (10–50 µF range). The proposed framework is experimentally tested on permanent magnet synchronous motors with fan-load and dynamometers. Experimental results demonstrate, with PIR, an 80% reduction in current and torque ripple occurring due to the use of a low-value dc-link film capacitor. This also achieves performance within ±5% of the results obtained with a drive equipped with a 1200 µF dc capacitor. In addition, the line-side power factor exceeds 0.98 for loads exceeding 8% of the rated power.
Emotion dysregulation as a mediator between parental emotional availability and game addiction among Turkish late adolescents
(Routledge, 2025-02)
This study aimed to examine how difficulty in emotion regulation mediates the relationship between parental emotional availability and game addiction among Turkish late adolescents. 537 adolescents completed the Lum Emotional Availability of Parents, the Difficulties in Emotion Regulation Scale, Internet Gaming Disorder Short Form, and Sociodemographic Characteristics and Data Form. The results show that difficulty in emotion regulation fully mediates between parental emotional availability scores and adolescents’ game addiction scores. It can be concluded that interventions for the prevention and treatment of game addiction in late adolescents should focus on improving the parents’ emotional support and adolescents’ emotion regulation skills.
Turkish validity and reliability study of the childhood illness attitude scale
(Routledge, 2025-03)
Severe forms of health anxiety cause serious dysfunction in people’s lives. Childhood Illness Attitude Scales (CIAS) is an assessment tool used to evaluate childhood health anxiety yet has not been validated for use in Turkey. The study aimed to examine the psychometric properties and factor structure of the Turkish version of the CIAS (CIAS-TR). The scale was administered to 306 children aged between 8 and 15 years. In addition to the CIAS-TR, participants were asked to complete the Screen for Child Anxiety-Related Emotional Disorders (SCARED) and the Pediatric Quality of Life Inventory (PedsQL). To measure test-retest reliability, CIAS-TR was completed by participants 15 days later. Results demonstrated good psychometric properties with high internal consistency and test-retest reliability. A positive correlation with SCARED and a negative correlation with PedsQL. Results from Confirmatory Factor Analysis suggested that a four-factor model best fit the data. The findings of the study indicate that the Turkish adaptation of the CIAS is an appropriate tool for assessing health anxiety in children.
