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Article Citation - WoS: 4Citation - Scopus: 4Development and Psychometric Analysis of a Pediatric Oncology Nurses' Educational Needs Scale(Wiley, 2023) Kudubes, Asli Akdeniz; Semerci, Remziye; Ozbay, Sevil Cinar; Ay, Ayse; Boztepe, HandanBackground/objectivesIt is important to determine the educational needs of pediatric oncology nurses in order to maximize and implement nursing care interventions. Therefore, this study aims to develop a valid and reliable measurement tool to determine pediatric oncology nurses' educational needs and examine its psychometric properties. Design/methodsThis methodological study was conducted with 215 pediatric oncology nurses in Turkey between December 2021 and July 2022. Data were collected with the "Nurse Information Form" and "Pediatric Oncology Nurses' Educational Needs Scale." IBM SPSS 21.0 and IBM AMOS 25.0 software programs were used for data analysis, and descriptive statistics were used to analyze numeric variables. Exploration and confirmatory factor analyses were performed to determine the scale's factorial structure. ResultsThe factorial analysis was used to test the structural validity of the scale. A five-factor structure consisting of 42 items was developed. The Cronbach's alpha coefficient for "Illness" was .978, "Chemotherapy and Side Effect" was .978, "Another Therapy and Side Effect" was .974, "Palliative Care" was .967, "Supportive Care" was .985, and the total score was .990. Fit indices resulting from the study were chi(2)/SD: 3.961, root mean square error of approximation (RMSEA): 0.072, goodness-of-fit index (GFI): 0.95, comparative-of-fit index (CFI): 0.96, and normed fit index (NFI): 0.95. ConclusionThe Pediatric Oncology Nurses' Educational Needs Scale is a valid and reliable scale for pediatric oncology nurses to determine their educational needs.Article Citation - WoS: 26Citation - Scopus: 28Mean residual life of coherent systems consisting of multiple types of dependent components(Wiley, 2018) Eryilmaz, Serkan; Coolen, Frank P. A.; Coolen-Maturi, TahaniMean residual life is a useful dynamic characteristic to study reliability of a system. It has been widely considered in the literature not only for single unit systems but also for coherent systems. This article is concerned with the study of mean residual life for a coherent system that consists of multiple types of dependent components. In particular, the survival signature based generalized mixture representation is obtained for the survival function of a coherent system and it is used to evaluate the mean residual life function. Furthermore, two mean residual life functions under different conditional events on components' lifetimes are also defined and studied.Article Citation - WoS: 12Citation - Scopus: 14The Markov Discrete Time Δ-Shock Reliability Model and a Waiting Time Problem(Wiley, 2022) Chadjiconstantinidis, Stathis; Eryilmaz, Serkandelta-shock model is one of the widely studied shock models in reliability theory and applied probability. In this model, the system fails due to the arrivals of two consecutive shocks which are too close to each other. That is, the system breaks down when the time between two successive shocks falls below a fixed threshold delta. In the literature, the delta-shock model has been mostly studied by assuming that the time between shocks have continuous distribution. In the present paper, the discrete time version of the model is considered. In particular, a proper waiting time random variable is defined based on a sequence of two-state Markov dependent binary trials and the problem of finding the distribution of the system's lifetime is linked with the distribution of the waiting time random variable, and we study the joint as well as the marginal distributions of the lifetime, the number of shocks and the number of failures associated with these binary trials.Article Citation - WoS: 26Citation - Scopus: 28Reliability Assessment for Discrete Time Shock Models Via Phase-Type Distributions(Wiley, 2021) Eryilmaz, Serkan; Kan, CihangirIn this paper, particular shock models are studied for the case when the times between successive shocks and the magnitudes of shocks have discrete phase-type distributions. The well-known shock models such as delta shock model, extreme shock model, and the mixed shock model which is obtained by combining delta and extreme shock models are considered. The probability generating function and recursive equation for the distribution of the system's lifetime are obtained for the cases when the interarrival times between shocks and the magnitudes of shocks are independent and when they are dependent. System reliability is computed for particular interarrival distributions such as geometric, negative Binomial and generalized geometric distributions.Article Citation - WoS: 9Citation - Scopus: 10Coherent System With Standby Components(Wiley, 2018) Eryilmaz, Serkan; Erkan, T. ErmanA coherent system that consists of n independent components and equipped with r cold standby components is considered. A generalized mixture representation for the survival function of such a system is obtained, and it is used to examine reliability properties of the system. In particular, the effect of adding r standby components to a given set of original components is measured by computing mean time to failure of the system. The limiting behavior of the failure rate of the system is also examined using the mixture representation. The results are illustrated for a bridge system. A case study that is concerned with an oil pipeline system is also presented.Article Citation - WoS: 2Citation - Scopus: 2A New Extended δ-shock Model With the Consideration of Shock Magnitude(Wiley, 2024) Lorvand, Hamed; Eryilmaz, SerkanIn this article, a new delta$$ \delta $$-shock model that takes into account the magnitude of shocks is introduced and studied from reliability perspective. According to the new model, the system breaks down if either a shock after non-critical shock occurs in a time length less than delta 1$$ {\delta}_1 $$ or a shock after a critical shock occurs in a time length less than delta 2,$$ {\delta}_2, $$ where delta 1Article The Pediatric Provider Communication Skills Assessment Scale(Wiley, 2023) Boztepe, Handan; Ozbay, Sevil Cinar; Akcam, Aysun; Kanbay, YalcinProblemBuilding rapport and trust between healthcare professional and patient/parents would improve satisfaction of patient/parents. The purpose of this study was to develop "The Pediatric Provider Communication Skills Assessment Scale" in this study. MethodsA trial form, with linguistic and psychometric validation and consisting of 44 statements, was administered to a sample of 325 individuals. Data were collected between January 20 and October 22, 2021. The validity of the scale was concluded after examining its construct validity and internal validity. "Exploratory factor analysis" was used for determining construct validity, and "comparison of lower-upper groups" for internal validity. "Cronbach's & alpha; reliability coefficient" and "split half test consistency coefficient" were calculated for testing the reliability of the scale. FindingsThe Pediatric Provider Communication Skills Assessment Scale that we developed consists of one dimension and 20 items, and the variance it can explain was calculated as 62.3%. The Cronbach & alpha; reliability coefficient of the scale was calculated as 0.90, indicating high reliability. ConclusionsAccording to the findings, "The Pediatric Provider Communication Skills Assessment Scale" is a scale with features that can measure in a valid and reliable way, with high variance and a low number of items. The study aims to develop the "The Pediatric Provider Communication Skills Assessment Scale," and present it to the literature as a validated and reliable new objective measurement tool. This study will enable us to understand more about the complex communication processes involved in pediatric care and how these may influence care delivery.Article Citation - WoS: 4Citation - Scopus: 6Statistics and Probability Theory in Renewable Energy: Teaching and Research(Wiley, 2023) Eryilmaz, Serkan; Kateri, Maria; Devrim, YilserIn this paper, the key-role and utility of statistics and probability theory in the field of renewable energy are emphasized and illustrated via specific examples. It is demonstrated that renewable energy is a very suitable field to effectively teach and implement many statistical and probabilistic concepts and techniques. From a research point of view, statistical and probabilistic methods have been successfully employed in evaluating renewable energy systems. These methods will continue to be of core interest for the renewable energy sector in the future, as new and more complex renewable energy systems are developed and installed. In this context, some future research directions in relation to the evaluation of renewable energy systems are also presented.Article Citation - WoS: 6Citation - Scopus: 6Validity and Reliability of the Family Empowerment Scale for Parents of Children With Cleft Lip And/Or Palate(Wiley, 2022) Boztepe, Handan; Cinar, Sevil; Kanbay, Yalcin; Acimis, Burcu; Ozgur, Figen; Terzioglu, FusunBackground Empowerment is recognized as a crucial concept in strengthening the position of parents in healthcare services. This study aimed to evaluate the validity and reliability of the Turkish Family Empowerment Scale (FES). Methods This methodological study was conducted between January and March 2021, with 348 family members actively caring for their children in the age group of 0-18 years with cleft lip and/or palate (CL/P). The English FES was translated into Turkish using back translation and modified so that it is generic and convenient for all families. The construct validity, internal validity, internal consistency, and split-half test reliability and responsiveness of the Turkish FES were examined. Results The original FES structure with three factors (family, health services provided to the child and community participation) and 34 items was verified in Turkish culture. This obtained structure can explain 66% of the variance of the relevant concept. Scores of parents ranged between 34 and 170 points. Increasing scores indicated a positive significance regarding family empowerment. The Cronbach's alpha reliability coefficient of the scale was calculated as 0.976. Conclusion The study findings and the goodness-of-fit values indicated that the FES and its Turkish version are a valid and reliable measurement instrument to be used in Turkish culture.
