Serious Leisure Inventory and Measurement (Short Form): Validity and Reliability Analysis

The aim of this study is to provide the validity and reliability analysis of the ‘’Serious Leisure Inventory and Measurement (Short Form)’’ SLIM and introduce it to the literature. The data obtained from 285 university students and the KMO-Barlett test was performed and the sample size was tested (.89; 2506.309, p<0,001). A three subdimensions of structure was obtained by exploratory factor analysis. According to the exploratory factor analysis, the cut-off value was determined as .40, a total of 18 items were converted into a 12-item form by subtracting the load-bearing substances from the measuring instrument, and factor loads of three sub-dimensions were obtained between .55 and .83. In addition to the factor analysis results, 65% of the total variance was obtained, internal consistency coefficients were taken, respectively .83, .84 and .75 were found for each sub-dimension. The total internal reliability coefficient was found to be .88. Confirmatory factor analysis was performed to test the validity and accuracy of the structure obtained after the exploratory factor analysis with 350 students. It is observed that the CFA performed after the test retest constitutes evidence for the structure validity (RMSEA .069, SRMR 0.60, NFI 0.94, CFI 0.96, GFI 0.94, x2/df 2.42). As a result, a valid and reliable measurement tool for serious leisure has been introduced

PRIDA: PRIvacy-preserving Data Aggregation with multiple data customers

We propose a solution for user privacy-oriented privacy-preserving data aggregation with multiple data customers. Most existing state-of-the-art approaches present too much importance on performance efficiency and seem to ignore privacy properties except for input privacy. Most solutions for data aggregation do not generally discuss the users’ birthright, namely their privacy for their own data control and anonymity when they search for something on the browser or volunteer to participate in a survey. Still, they are ambitious to secure data customers’ rights (which should come later). They focus on resulting in an efficiency-oriented data aggregation enabling input privacy only. We aim to give importance to user privacy, and we have designed a solution for data aggregation in which we keep efficiency in balance. We show that PRIDA provides a good level of computational and communication complexities and is even better in timing evaluation than existing studies published recently (i.e., Bonawitz et al. (CCS’17), Corrigan-Gibbs et al. (NSDI’17), Bell et al. (CCS’20), Addanki et al. (SCN’22)). We employ threshold homomorphic encryption and secure two-party computation to ensure privacy properties. We balance the trade-off between a proper design for users and the desired privacy and efficiency

Serious Leisure Inventory and Measurement: Validity and reliability analysisCiddi Boş Zaman Envanteri ve Ölçümü: Geçerlik ve güvenirlik çalışması

The aim of this research was to adapt the scale “Serious Leisure Inventory and Measure” developed by Gould et al. (2008) and perform its validity and reliability analyses. The research was carried out on 3 different study groups consisting a total of 474 students from various faculties of Gazi University, Turkey during the fall term of 2015-2016. Throughout the adaptation process, primarily the linguistic equivalence of the scale was investigated, and when it was seen that the scale was linguistically equivalent, the validity and reliability analyses were performed. The construct validity of the adapted scale was analyzed with confirmatory factor analysis, and it was seen that the scale was consistent with the original. As a result of reliability analysis, internal consistency coefficient of the scale was found as .97, and test-retest reliability coefficient as .93. As a result of item analysis, it was determined that the corrected item-total correlation of the sub-dimensions ranged from .42 to .73. These results show that the scale is valid and reliable to measure forms of Serious Leisure. ÖzetBu araştırmanın amacı, Gould ve diğerleri (2008) tarafından geliştirilen Ciddi Boş Zaman Envanteri ve Ölçümü’nü (Serious Leisure Inventory and Measure / SLIM) Türkçeye uyarlamak ve ölçeğin geçerlik ve güvenirlik analizlerini gerçekleştirmektir. Araştırma 2015-2016 öğretim yılı güz döneminde Gazi Üniversitesi’nin çeşitli bölümlerinde öğrenim gören ve toplam 474 öğrenciden oluşan 3 ayrı çalışma grubu üzerinde yürütülmüştür.  Uyarlama sürecinde öncelikle CBZEÖ’nün dil eşdeğerliği incelenmiş, dil eşdeğerliğine sahip olduğu görüldükten sonra geçerlilik ve güvenilirlik analizleri yapılmıştır. Yapılan doğrulayıcı faktör analizi ile uyarlanan ölçeğin yapı geçerliği incelenmiş ve orijinal formla uyumlu olduğu görülmüştür. Güvenirlik analizi sonucunda, ölçeğin iç tutarlılık katsayısı .97 ve test-tekrar güvenirlik katsayısı .93 olarak hesaplanmıştır. Madde analizi sonucunda, alt ölçeklerin düzeltilmiş madde toplam korelasyonlarının. 42 ile .73 arasında değiştiği belirlenmiştir. Bu sonuçlar ölçeğin, Ciddi Boş Zaman perspektifinin ölçülmesinde geçerli ve güvenilir bir ölçme aracı olduğunu göstermektedi

TEDARİK ZİNCİRİNDE YAŞANAN KÜRESEL MİKROÇİP KITLIĞINA KISITLAR TEORİSİ YAKLAŞIMI

Son yıllarda gelişen teknoloji ile birlikte dijital dünyaya olan yönelim artmış ve bu durum mikroçiplere olan talebi etkilemiştir. Günümüzde ev elektroniği, kripto para madenciliği cihazları, oyun konsolları, otomobiller ve sağlık sektöründe ihtiyaç duyulan cihazlar gibi birçok ürünün üretiminde mikroçip tedariğine ihtiyaç duyulmaktadır. Küresel bağlamda artan talebe bağlı yaşanan mikroçip kıtlığı, 2020 yılında Covid-19 pandemisi ile derinleşmeye başlamıştır. Mikroçip kıtlığından en çok etkilenen sektörlerden olan otomotiv sektörü açısından bakıldığında, krizin tedarik zinciri boyutundaki etkileri daha net görülebilmektedir. Mikroçip üreten bir firmanın imalat süreci iki aya yakın sürmektedir. Siparişten sevkiyata kadar geçen süre ise toplamda dört ayı bulabilmektedir. Modern bir araçta 100’e yakın mikroçip bulunmaktadır. Mikroçip tedarik edemeyen otomotiv üreticilerinin 10 milyona yakın bekleyen siparişi bulunmaktadır. Mikroçip üreticisi firmalar ise hammadde tedarikinde ciddi sorunlar yaşamaktadır. Doğal afetler ve su kıtlığı ile başlayan hammadde sorunları; gelişen teknoloji ve pandemi ile birlikte tüketicilerin daha yüksek teknolojili ürünlere olan talebinin beklenenin üzerinde artması ile birlikte mikroçip üreticileri çok ciddi bir kriz ile karşı karşıya gelmiştir. Kısıtlar teorisi 1980’li yılların başında Dr.Eliyahu M.Goldralt tarafından ortaya konulmuştur. Kısıtlar teorisi sistemlerin işleyişinde aksamalar yaratarak, sistem performansını düşüren unsurun bulunması ve sistemin iyileştirmesini içeren bir teoridir. Bu teoride sistem bir zincir olarak ele alınmaktadır ve zinciri oluşturan halkalardan en zayıf olanı “kısıt” olarak adlandırılmaktadır. Teori, sistemin ampirik yöntemler ile iyileştirilmesi için kısıta odaklanılmasını önermektedir. Bu çalışmada son yıllarda tedarik zincirinde yaşanan aksamalar nedeniyle yaşanan mikroçip kıtlığı, ortaya çıkış nedenleri, mikroçip kıtlığı ile mücadelede önerilen eylem planları küresel bağlamda paylaşılmıştır. Çalışmada kısıtlar teorisi, mikroçip kıtlığının işletmelerde yarattığı darboğazın iyileştirilmesine yönelik bir model olarak sunulmuştur.With the developing technology in recent years, the tendency towards digital world has increased and this has affected the demand for microchips. Today, the supply of microchip is needed in the production of many products such as home electronics, cryptocurrency mining devices, game consoles, automobiles and devices needed in the health sector. Microchip shortage due to increasing demand in the global context began to deepen in 2020 with the Covid-19 pandemic. From the perspective of the automotive sector, which is one of the sectors most affected by the microchip shortage, the effects of the crisis on the supply chain can be seen more clearly. The manufacturing process of a microchip producer takes about two months. The time from order to shipment can take up to four months in total. There are close to 100 microchips in a modern vehicle. Automotive manufacturers who cannot supply microchips have nearly 10 million pending orders. Microchip manufacturers, on the other hand, have serious problems in the supply of raw materials. Raw material problems that started with natural disasters and water scarcity; Microchip manufacturers have faced a very serious crisis with the increasing demand of consumers for higher technology products with the developing technology and pandemic. The theory of constraints was introduced by Dr. Eliyahu M. Goldralt in the early 1980s. The theory of constraints is a theory that includes finding the factor that reduces the system performance by creating disruptions in the functioning of the systems and improving the system. In this theory, the system is considered as a chain, and the weakest of the links that make up the chain is called the "constraint". The theory suggests focusing on the constraint to improve the system with empirical methods. In this study, the microchip shortage experienced due to the disruptions in the supply chain in recent years, the reasons for its emergence, the action plans proposed to overcome the microchip shortage are shared in a global context. In this study, the theory of constraints is presented as a model for improving the bottleneck created by microchip shortage in corporations.</p

Analysis of chippaux smirak index on dynamic balance scores

Aim: The aim of this study is to examine whether Chippaux Smirak Index (CSI) calculated from footprint and measurements takenfrom foot have an effect on balance scores.Materials and Methods: 61volunteers (25 males, 36 females) between the ages of 18 and 24 were included in our study and 122feet were measured. Footprints of the participants were taken by using Harris imprint. Footprints were scanned, the parameterswere measured with Digimizer program and CSI was calculated. Metatarsal foot width (MFW), maximum metatarsal foot width(MMFW), length of the foot (LoFA), heel width (HW) and foot length (FL) taken from footprints were measured. Individuals withCSI >62.70% were considered as flatfooted and excluded from the study. Dynamic balance measurements were made with BiodexBalance System (BBS) (Biodex Medical Systems, Shirley, 2000, New York). Overall (OA), anterior-posterior (AP) and medial-lateral(ML) dynamic balance assessments of the participants were made with eyes open.Results: According to Mann Whitney U analysis results, statistically significant difference was found between MFW, MMFW, LoFA,HW and FL parameters of men and women in both feet (p<0.05). It was found that OA, AP and ML balance scores had a statisticallysignificant difference between men and women for dynamic balance (p<0.05). According to Sperman Rho correlation analysis, apositive correlation was found between weight and body mass index (BMI) and balance scores in men and women. It was found thatthere was no significant correlation between CSI and balance scores.Conclusion: As a conclusion, while no association was found between weight and BMI and CSI, a positive correlation was foundbetween weight and balance scores. We believe the fact that women have lower BMI gives them an advantage in terms of balancescores. In addition, it was found as a result of this study that there was no association between CSI and balance scores. We believethat our study will have an important place in literature and be a guide since we compared both genders

Synthesis, Aggregation, Antioxidant and DNA-Binding Properties of Metallophthalocyanines Bearing 5-Tert-butyl-2-hydroxyphenoxy groups

In this study, the synthesis and characterization of new substituted metallophthalocyanines are described. A new phthalonitrile, 4-(5-tert-butyl-2-hydroxyphenoxy)-5-chlorophthalonitrile (3) was prepared. New compounds were characterized by UV–Vis, IR, 1HNMR, and elemental analysis. The aggregation behavior of the cobalt (II), magnesium (II) and copper (II) phthalocyanines were studied in tetrahydrofuran and in known concentration ranges. The antioxidant activities of compounds were evaluated. Their radical-scavenging capacity, metal chelating activity and reducing power was fully studied. The compound 3 showed 100% chelating activity as EDTA at concentration 50 mg/L. The DNA interaction of copper (II) phthalocyanine compound (6) was studied using UV/Vis titration, gel electrophoresis, cyclic voltammetry. The results indicated that compound 6 interacts with CT-DNA via intercalation binding mode

Control of thermal stresses in axissymmetric problems of fractional thermoelasticity for an infinite cylindrical domain

In this paper, we study a control problem of thermal stresses in an infinite cylindrical body. The temperature distribution is defined by the time-fractional heat conduction equation with the Caputo derivative of the order 0 < α ≤ 2. The problem is formulated for axisymmetric case. The sought-for heat source function is treated as a control of stress and displacement components. For this purpose, we find the control function which guarantees the distribution of the stress component in some section of a body and at some time at a prescribed level. Integral transform technique is applied to obtain the desired control function, stresses and displacement components. Numerical results are illustrated graphically

Synthesis and antioxidant, aggregation, and electronic properties of 6-tert-butyl-1,4-benzodioxine substituted phthalocyanines

As a starting material, 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile was prepared by the reac- tion of 4-tert-butylcatechol with 4,5-dichlorophthalonitrile. Metallophthalocyanine complexes ( 4 { 7 ) were obtained by cyclotetramerization of 7-tert-butyldibenzo [b,e] [1,4] dioxine-2,3-dicarbonitrile. All compounds were characterized by elemental analysis and other spectroscopic methods (IR, UV/Vis, and 1 H NMR). Phthalocyanine compounds remained nonaggregated in tetrahydrofuran at the studied concentration ranges. Metallophthalocyanines ( 4 { 7 ) were tested for their antioxidant activities. The antioxidant activity processes included evaluation of radical-scavenging activity, chelat- ing activity, and reducing power. These compounds were compared to standard antioxidant ascorbic acid. The electronic data of the new compounds were obtained by computational calculations at the B3LYP/6-31G (d,p) level of theory