2045 research outputs found
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Data from an international multi-centre study of statistics and mathematics anxieties and related variables in university students (the smarvus dataset)
No full textThis large, international dataset contains survey responses from N = 12,570 students from 100 universities in 35 countries, collected in 21 languages. We measured anxieties (statistics, mathematics, test, trait, social interaction, performance, creativity, intolerance of uncertainty, and fear of negative evaluation), self-efficacy, persistence, and the cognitive reflection test, and collected demographics, previous mathematics grades, self-reported and official statistics grades, and statistics module details. Data reuse potential is broad, including testing links between anxieties and statistics/mathematics education factors, and examining instruments’ psychometric properties across different languages and contexts.2-s2.0-85176239315Mayı
In the pursuit of a course design: a tpack-based geometry for preservice mathematics teachers
No full textPreservice mathematics teachers seem to need professional support regarding
the use of educational technologies to teach geometry topics. Particularly, our
previous study showed that when it comes to their techno-pedagogical content
knowledge (TPACK), they self-report to need guidance to teach with technology.
The purpose of this study was to develop a 14-week course to increase their
TPACK in hopes of bridging the knowledge gap identified in earlier studies. This
paper summarized the course content with a humble expectation to get valuable
feedback from an international audience. The developed course included
lessons on components of TPACK, which were found to require improvement to
best meet future students’ needs in teaching geometry with technology. We
hope that preservice teachers’ TPACK levels will be improved after the course
Social connectedness and mental health before and during the COVID-19 pandemic in a community sample in Korea
No full textThis study compared social connectedness patterns and examined the relationships between objective or subjective social connectedness and mental health before and during the COVID-19 pandemic among community dwelling adults in South Korea. An identical online survey was administered at two time points, in 2019 prior to the onset and again in 2021. Objective (network diversity and network size) and subjective (thwarted belongingness and perceived burdensomeness) social connectedness were measured along with positive and negative indices of mental health (depression, suicidal behavior, happiness, and life satisfaction). The results indicated that among social connectedness indices perceived burdensomeness were significantly higher during the COVID-19 pandemic compared to the prior period, while network size was smaller. Subjective social connectedness was associated with all aspects of mental health consequences, either positive or negative. Among objective social connectedness, only network diversity was significantly associated with increased happiness and life satisfaction, and objective social connectedness was not associated with depression and suicidal behavior. These associations did not differ across the two time periods. The findings, both before and during the pandemic, indicated that network diversity is an important factor for positive indices of mental health and that efforts to increase subjective social connectedness are needed to decrease the risk of depression and suicidal behavior.WOS:0010992658000542-s2.0-8517469456837856559Science Citation Index ExpandedArticleUluslararası işbirliği yapılan - EVETEkimYÖK- 2022-23Eki
Executive Remuneration of Company Directors under EU Law and Turkish Law
No full textThe criteria to determine the material scope of executive pay has always been a controversial aspect of corporate law and corporate governance. The controversy stems from the fact that the board of directors generally tends to determine a suitable executive remuneration for its members, not considering the interests of other stakeholders. In some cases, an independent compensation/remuneration committee is appointed by the board of directors and determines the amount of executive pay. Depending on the legislation, this may require additional approval at the annual general meeting by the shareholders. European legislators have differing approaches with regards to regulating this very area of corporate pay. The revised Shareholders Rights Directive requires an enhanced approach for the shareholders' role by determining the remuneration policy of the company. These amendments can be identified as the promotion of the say on pay, on the remuneration policy, and remuneration report. Furthermore, the previous recommendations have also set the criteria to determine the amount of remuneration. The Directive contains provisions for setting up a clear and transparent corporate remuneration policy and shareholders' binding vote with temporary derogations. The corporate remuneration system of Turkish law is legislated under Art. 394 TCC (Turkish Commercial Code Nr. 6102), which only requires that board members can be paid an honorarium, salary, bonus, premium, and a portion of the annual profit, provided that this amount is determined by the articles of association, or by way of a general meeting resolution. Art. 408 TCC also stipulates a binding general meeting approval of the remuneration policy, whereas Art. 513 TCC requires the framework with regard to bankruptcy procedures. © 2023 Istanbul University Press. All rights reserved.2-s2.0-85166934752Eki
A novel graph transformation strategy for optimizing SpTRSV on CPUs
No full textSparse triangular solve (SpTRSV) is an extensively studied computational kernel. An important obstacle in parallel SpTRSV implementations is that in some parts of a sparse matrix the computation is serial. By transforming the dependency graph, it is possible to increase the parallelism of the parts that lack it. In this work, we present a novel graph transformation strategy to increase the parallelism degree of a sparse matrix and compare it to our previous strategy. It is seen that our transformation strategy can provide a speedup as high as 1.42x.WOS:0009823663000012-s2.0-85158086996Science Citation Index ExpandedarticleUluslararası işbirliği ile yapılmayan - HAYIRMayısYÖK - 2022-2
High-performance real-time data processing: managing data using Debezium, Postgres, Kafka, and Redis
No full textThis research focuses on monitoring and transferring logs of operations performed on a relational database, specifically PostgreSQL, in real-time using an event-driven approach. The logs generated from database operations are transferred using Apache Kafka, an open-source message queuing system, and Debezium running on Kafka, to Redis, a non-relational (No-SQL) key-value database. Time-consuming query operations and read operations are performed on Redis, which operates on memory (in-memory), instead of on the primary database, PostgreSQL. This approach has significantly improved query execution performance, data processing time, and backend service performance. The study showcases the practical application of an event-driven approach using Debezium, Kafka, Redis, and relational databases for real-time data processing and querying.2-s2.0-85178276920Eki
A critical overview of the Swiss federal court’s award dated 01.09.2021 and numbered 4a_606/2020 (BGE 147 III 463 et seq.) asserting that a hypothetical and aleatory loss of profit cannot be considered as a damage to be compensated
No full textİsviçre Federal Mahkemesi, Mahkeme’nin Resmî Karar Derlemesinde de yayımlanmasını uygun bulduğu (bu suretle de önemi kendiliğinden anlaşılabilecek) 01.09.2021 tarihli ve 4A_606/2020 sayılı kararında (ayrıca bkz. BGE 147 III 463 vd.), bir yatırım danışmanlığı ilişkisinde banka aracılığıyla yapılan borsa işlemleri özelinde değerlendirmelerde bulunmuş; özetle de banka tarafından müşterisinin bu yöndeki talimatına rağmen son tahlilde gerçekleştiril(e)meyen bir şirket hissesi alımı işleminde, müşterinin ilgili alımın yapılmaması sonucunda uğradığı kazanç kaybının, varsayımsal ve rastlantısal bir özellik göstermesi nedeniyle tazmin edilebilir bir zarar oluşturmadığı sonucuna ulaşmıştır. Kararda ulaşılan bu sonuçlar ve gerekçeleri eleştiriye matuftur. İşbu çalışmamızın amacı, ilgili kararın eleştirel bir bakış açısıyla ele alınarak, kararda ulaşılan temel sonuçların tartışmaya açılması ve yeniden değerlendirilmesidir.The Swiss Federal Court made some evaluations regarding the damage (suffered by a customer) occurred in the conduct of the stock exchange transactions by a bank, within the framework of an investment management relationship, in its award dated 01.09.2021 and numbered 4A_606/2020 (also see BGE 147 III 463 et seq.). This decision was also found worthy to be published in the Official Compilation of Judgments by the court, which directly remarks its importance. In the said award, the Federal Court mainly concluded through its reasoning that the loss of profit suffered by the customer as a result of the bank’s failure to make the relevant share purchase in the stock exchange, despite the customer’s clear instructions in the said direction, did not constitute a damage to be compensated due to its hypothetical and random (aleatory) nature. However, whether the court’s behavior in its earlier jurisprudence regarding the related issues is considered, these conclusions (along with their justifications expressed) are subject to a strong criticism. Accordingly, the purpose of this article is to discuss and evaluate the appropriateness of the conclusions reached in the said award from a critical perspective.Nisa
Favoring Inequalities and Mind-Reading: Social Dominance Orientation Relates to Poor Mentalizing
No full textAlthough studies have so far investigated social dominance orientation (SDO) in relation to its association with prejudice and discrimination toward outgroups, it is not known whether SDO's link with poor intergroup relations might be underlined by specific socio-cognitive factors such as reduced mind-reading motivation (MRM) and poor mind-reading performance. The present study tested whether endorsement of SDO is associated with decreased MRM and mind-reading accuracy toward both ingroup and outgroup targets. We randomly assigned one hundred and 20 Turkish university students (M- age = 22.02) into two target groups for mind-reading, Turkish ingroup (N = 60) and Syrian outgroup (N = 60), and asked them to infer minds of either ingroup or outgroup members depending on their target group. Participants also reported their level of MRM and SDO through questionnaires. When the target was a Turkish ingroup member, SDO negatively and directly predicted mind-reading, when the target was an outgroup member, however, higher SDO indirectly predicted lower mind-reading through reduced MRM. These results pointed that favoring intergroup hierarchies relates to poor understanding of others' mental states although the mechanism of the relation changes depending on the group membership of the target.WOS:0010320895000012-s2.0-8516566002037478167Social Sciences Citation IndexarticleUluslararası işbirliği ile yapılmayan - HAYIRAğustosYÖK - 2022-2
Gain sensitivity and cheating: The role of psychological entitlement
No full text...WOS:001091341701335Meeting AbstractUluslararası işbirliği ile yapılan - EVETDecemberYÖK - 2022-23Eki
The comparison of capital asset pricing model and arbitrage pricing model: Practice on Bist
No full textÇalışmanın birinci bölümünde risk tanımı ve türleri ele alınmaktadır. Risk kavramı, yatırımcılar için portföylerinde her zaman dikkat ettikleri konu olmuştur çünkü getiriye etki eden en önemli faktörlerden birisidir. Risk ikiye ayrılmakta olup bu riskler sistematik ve sistematik olmayan şeklinde ikiye ayrılmaktadır. Sistematik risk, ulusal ve uluslararası piyasalarda yer alan ve işlem gören tüm menkul değerlere doğrudan veya dolaylı olarak etki edebilecek potansiyelde olan ögelerin yarattığı toplam risktir. Sistematik olmayan risk, firmadan veya firmanın içinde bulduğu sektörden kaynaklı olan risk türüdür. Sistematik olmayan risk, gerekli çeşitlendirmelerin sağlanması ile yok edilebilir niteliktedir. Bölüm içerisinde sistematik risk ve sistematik olmayan risk türlerinden bahsedilmiştir. Yatırımcıların amacı, oluşturdukları portföylerden veya menkul kıymet yatırımlarından getiri elde etmektir. Oluşturulan portföylerin getiri oranında bir risk oranı da mevcuttur. Bu nedenle getiri-risk ilişkisi her zaman belirli bir ilişki içerisinde bulunmaktadır. Genellikle bu ilişki doğrusal yöndedir. Bir portföy veya piyasadaki varlıkların riskini ölçmek, birden fazla varlığın riskini ölçmekten farklıdır. Bu hususlara değinilmekte ve konu birçok matematiksel ölçütlerle ifade edilmektedir. Ölçütler varyans ve varyansın karekökü olan standart sapma, ilişki anlamı yaratan kovaryans ve korelasyon değişkenler olup aynı zamanda riski ölçen değerlerdir. Alınan risk oranında sağlanabilecek getiri oranlarının hesaplanma yöntemleri aynı şekilde birinci bölümde bahsedilmiştir. İkinci bölümde ise getiriye etki eden risk faktörünün elimine edilmesi için uygulanan ve yıllar geçtikçe daha çok önem kazanan portföy kavramından bahsedilmiştir. Portföy yönetiminde amaç, var olan yatırımların çeşitlendirilerek riskin seviyesini minimum yapmaktır. Portföy yönetiminin ilk adımları 1952 yılında Markowitz'in ele aldığı "Portföy Seçimi" isimli makalesi ile atılmıştır. 1959 yılında ise yayınlamış olduğu kitap ile portföye ait çeşitlendirme, yönetim, riskin ölçümü konuları ele alınmış ve modern portföy kavramı ortaya çıkmıştır. Sürecin devamında ise portföy teorisi, 1964 yılında Sharpe ile başlamıştır. Lintner ve Mossin ise 1 yıl arayla birbirlerine herhangi bir etkide bulunmadan süreci hem iyileştirip hem de devam ettirmişlerdir. Sharpe, portföy yönetim modelini ilk oluşturan kişi olmuştur. Lintner ve Mossin ise bu modele teorik anlamda geliştirmelerle destek olmuştur. Üçüncü bölümde varlık fiyatlama modelleri tanımlanmıştır. Bu modellerden başlıcaları Finansal Varlık Fiyatlama ile Arbitraj Fiyatlama Modeli'dir. Devamında ise ele alınan bu modeller için yapılan varsayımlar ve modellere ilişkin form yapıları tanımlanmış ve birbirleri ile kıyaslanmıştır. Bu modellerden finansal varlık fiyatlama modelleri, piyasa portföylerini önemli görmekte ve sistematik riskin bir göstergesi olan beta katsayısının varlık getirilerini açıklamak için de kullanıldığını belirtmektedir. Sermaye piyasası teorisinin bir ürünü olan FVFM, piyasa dengedeyken riskin piyasa fiyatını belirlemekte ve bireysel varlıklar için uygun bir risk ölçüsünü revize ederek iyileştirmektedir. Aynı zamanda bağımsız değişken olarak piyasa portföyünü temel almaktayken, riskli menkul kıymet getirilerini belirlerken piyasa portföy getirisinden faydalanmaktadır. Finansal Varlık Fiyatlama Modeli'ne ait yetersizlik ve eleştirilere cevap verememesinden ötürü araştırmacılar yeni modeller geliştirmeye ve araştırmaya başlamışlardır. Geliştirilen model ise bu noktada Arbitraj Fiyatlama Modeli'dir. Bu modelde, piyasadaki menkul kıymetler tam olarak aynı risk ve getiriye sahipse, yatırımcılar fiyatları dengeye getirmek için arbitraj yapmayı beklerler. Arbitraj kavramı, aynı menkul kıymetler için farklı piyasalarda farklı fiyatların oluşturulmasıdır. Yatırımcılar, fiyatın düşük olduğu pazarlarda alıp, fiyatın yüksek olduğu pazarlarda satarak kar elde ederler. AFM ilk olarak 1970'li yıllarda Stephen A. Ross tarafından geliştirilmiş ve 1976 yılında formüle edilerek yayınlanmıştır. Model için Roos tarafından geliştirilen bu formülün Finansal Varlık Fiyatlandırma Modeline göre daha az kısıtlayıcı olduğu söylenebilir. Ross'un yaklaşımındaki temel nokta, birden çok sayıda var olan sistematik risk unsurunun varlık getiri oranlarındaki etkisi olduğu varsayımıdır. Arbitraj Fiyatlama Modeli; faiz oranı riski, piyasa riski, ödenmeme riski, satın alma gücü riski, yönetim riski ve belirli bir varlığı değerlendirme ile ilgili olabilen diğer risk faktörlerine ait ağırlıklı ortalamaları kullanarak risk ile getiri arasında ilişki kurmaktadır. Dördüncü bölümde uygulama bölümü ve uygulama bölümünde kullanılan testlerin metodolojik bilgileri yer almaktadır. Varlık fiyatlama modelleri çerçevesinde BIST100 endeksine etki edebilecek dokuz makroekonomik değişkenin 05/2010 – 01/2020 dönemleri arasındaki ilişki ele alınmıştır. Yapılan analizler ile modelde yer alan değişkenler ilk aşamada durağanlaştırılarak değerlerinde yatay bir saçılım elde edilmiş, Granger nedensellik testi ile kısa dönem ilişkisi ele alınırken Johansen Eş-bütünleşme testi ile uzun dönem ilişkisi belirlenmiştir. Etki-tepki analizi ile modelde yer alan değişkenlerin dönem bazlı BIST100 üzerindeki etkisi de analiz edilmiştir. Bu analizler sonucunda kısa vadede modele dahil edilen değişkenlerin (faiz değişkeni hariç) BIST100 üzerinde etkisinin bulunmadığı ancak uzun dönemde etkilerinin olduğunu sonucu çıkarılmıştır. Anahtar Kelimeler: Getiri, risk, portföy, finansal varlık fiyatlama, arbitraj fiyatlamaThe definiton of risk and variety of risks are examined in the first chapter. Investors attach importance to risk in portfolio because of affecting the return. Two kinds of risk that the first one is systematic risk and the other one is nonsystematic risk. Systematic risk is the total risk that created by the factors affecting all the securities involved in market. On the other hand, nonsystematic risk is about the company or originated from sector. This type of risk can be eliminated by providing with necessary diversification. More details about the kinds of risks are in the chapter. The purpose of the investors that provide the return from securities and portfolio. There are ratio of risk and portfolio at the same time. Therefore, the relationship between risk and return have direct proportion all time. The risk measurement of asset and more than one asset are different from each other. Also mathematical measures such as variance, standard deviation, covariance and correlation were addressed in this study. In the second chapter, this study included that the factor of risk which affect the return applied to eliminate portfolio concept and this concept is the more important over the years. The aim of the portfolio management, investments are that vary and minimize the level of risk. The article of ''Portfolio Selection'' is the first step of portfolio management in 1952. In addition, Markowitz published the book that is about the variety of portfolio, management, measurement of risk and occurance the concept of modern portfolio in 1959. Then, theory of portfolio whom Sharpe in 1964, Lintner in 1965, Mossin in 1966 developed independently. Also, Sharpe found the model of portfolio management and Lintner and Mossin contributed to develop this model. Third chapter included the definitions of capital asset pricing and arbitrage asset pricing models and comparison of these models using forms and assumption. Financial capital asset model considers the important market portfolio and states that the beta coefficient which is an indicator of systematic risk is also used in explaining the asset returns. Financial capital asset model is that the product of capital market determines the market price of risk while the equalization and it develops the measurement of risk for one asset. Financial Capital Asset based on the market portfolio. The market takes advantage of portfolio returns while it determines the risky securities returns. Researchers have developed and investigated the new models because of inadequate financial capital asset. The name of the new model is Arbitrage Asset Model. When the securities have the same risk and return in the market, arbitrage and price have predicted to balance for investors. Arbitrage is the formation of different prices of the same securities in the different markets. Investors make a profit by buying in the low price market and selling in the high price market. Arbitrage Asset Model developed by Stephan A.Ross in 1970 and it published and formulated in 1976. According to the Ross's Model, it had less limiting features than Financial Capital Asset Model. It is the pointed of Ross's Model that a lot of factors of systematic risk predict to affect the rate of asset returns. Arbitrage Asset Model includes that the relationship between the risk and return by using heavy averages of interest rate risk, market risk, nonpayment risk, purchasing power risk, management risk and other risk factors. Fourth chapter involves the methodological information of using some tests. In addition, index of BIST 100 can affect the nine independent macroeconomic variables and it investigated the relationship between the period of 05/2010- 01/2020 in this study. While it was used the Granger test for short term relation, Johansen test was used the long term relation. Moreover, this study was analyzed the impact of variables in model based on the period of BIST 100 by using action- reaction analyze. As a result of these analyzes, variables do not have an effect in the short term on the BIST 100 without the interest rate variable but they have an effect in the long term. Key Words: Return, risk, portfolio, financial capital asset, arbitrage asset