22 sonuçlar
Arama Sonuçları
Listeleniyor 1 - 10 / 22
Yayın Prisoners’ dilemma in a spatially separated system based on spin–photon interactions(MDPI, 2022-09) Altıntaş, Azmi Ali; Özaydın, Fatih; Bayındır, Cihan; Bayrakçı, VeyselHaving access to ideal quantum mechanical resources, the prisoners’ dilemma can be ceased. Here, we propose a distributed quantum circuit to allow spatially separated prisoners to play the prisoners’ dilemma game. Decomposing the circuit into controlled-Z and single-qubit gates only, we design a corresponding spin–photon-interaction-based physical setup within the reach of current technology. In our setup, spins are considered to be the players’ logical qubits, which can be realized via nitrogen-vacancy centers in diamond or quantum dots coupled to optical cavities, and the game is played via a flying photon realizing logic operations by interacting with the spatially separated optical cavities to which the spin qubits are coupled. We also analyze the effect of the imperfect realization of two-qubit gates on the game, and discuss the revival of the dilemma and the emergence of new Nash equilibria.Yayın Son ergenlik döneminde dissosiyatif bulgular ile ruminasyon arasındaki ilişkide duyguları ifade etmenin rolü(Kıbrıs Ruh Sağlığı Enstitüsü, 2023-03-27) Özgönül, Afranur; Aktan, Zekeriya Deniz; Ülkümen, İpekBu araştırmanın temel amacı son ergenlik dönemindeki bireylerin dissosiyatif bulguları ile ruminasyon düzeyleri arasındaki ilişkide duyguları ifade etmenin aracı rolünü incelemektir. Araştırmaya 18-24 yasları arasında olan 502 kişi katılmıştır. Veriler, Sosyodemografik Bilgi Formu, Dissosiyasyon Ölçeği (DIS-Q), Ruminatif Düşünce Biçimi Ölçeği (RDBÖ) ve Duyguları İfade Etme Ölçeği (DİEÖ) aracılığıyla toplanmıştır. Araştırmadan elde edilen bulgulara göre son ergenlik dönemindeki bireylerin ruminasyon düzeyleri arttıkça duyguları ifade etme düzeylerinin azaldığı ve dissosiyasyon düzeylerinin arttığı; duyguları ifade etme düzeyleri azaldıkça dissosiyasyon düzeylerinin arttığı görülmüştür. Son ergenlik dönemindeki bireylerin dissosiyatif bulguları ile ruminasyon düzeyleri arasındaki ilişkide duyguları ifade etmenin kısmi aracı etkisi olduğu saptanmıştır. Araştırmamızın söz konusu değişkenlerin geçmiş araştırmalarda sınırlı sayıda incelenmesi açısından literatüre katkı sağladığı düşünülmektedir.Yayın Engineering four-qubit fuel states for protecting quantum thermalization machine from decoherence(Multidisciplinary Digital Publishing Institute (MDPI), 2024-01-10) Özaydın, Fatih; Sarkar, Ramita; Bayrakçı, Veysel; Bayındır, Cihan; Altıntaş, Azmi Ali; Müstecaplıoğlu, Özgür E.Decoherence is a major issue in quantum information processing, degrading the performance of tasks or even precluding them. Quantum error-correcting codes, creating decoherence-free subspaces, and the quantum Zeno effect are among the major means for protecting quantum systems from decoherence. Increasing the number of qubits of a quantum system to be utilized in a quantum information task as a resource expands the quantum state space. This creates the opportunity to engineer the quantum state of the system in a way that improves the performance of the task and even to protect the system against decoherence. Here, we consider a quantum thermalization machine and four-qubit atomic states as its resource. Taking into account the realistic conditions such as cavity loss and atomic decoherence due to ambient temperature, we design a quantum state for the atomic resource as a classical mixture of Dicke and W states. We show that using the mixture probability as the control parameter, the negative effects of the inevitable decoherence on the machine performance almost vanish. Our work paves the way for optimizing resource systems consisting of a higher number of atoms.Yayın Alevi ve Bektaşi yazı-resim sanatında insan sureti(Ankara Haci Bayram Veli University, 2020-03-20) Günana, MeryemBu makalede; 1826’da dağıtılan Bektaşi tarikatı Babagan (Mücerret) kolunun üretmiş olduğu, ancak 1925 yılında tekke ve zaviyelerin kapatılmasıyla özel koleksiyonlara, müzelere girmiş fakat çoğunluğu ise tahrip edilmiş olan; sureti sîrete, sîreti surete dönüştüren “yazı-resim” sanatının Alevi ve Bektaşi erkânındaki yeri ve önemi anlatılmaya çalışılmıştır. Bu sanatın Hurûfîlik etkisiyle ortaya çıkmadığı, piktogram veya güzel yazı yazma/kaligrafi olmadığı; vahdet-i vücut düşüncesinin bir tezahürü olduğu ifade edilmiştir. Alevi ve Bektaşi erkânının ortaya koyduğu yazı-resim sanatının harflerle üretilmiş bulunması Hurufîlik olarak adlandırılmasına neden olsa da; bu sanatın Hurufîlik düşüncesinin ürünü değil aksine vahdet-i vücut düşüncesinin bir yansıması olduğuna dair açıklık getirilmiştir. Simetrik bir anlayışla gerçekleştirilen yazı-resimlerde, hat sanatında “müsennâ” yani “aynalı yazı” olarak bilinen yazı şeklinin neden tercih edildiği anlatılmaya çalışılmıştır. Varlığın zahir(dış) ve batın(iç) suretlerine simgesel bir göndermede bulunan yazı-resim sanatının vahdet-i vücut düşüncesi ile olan irtibatı anlatılmıştır. Yazı-resimlerde önemli bir yere sahip olan insan suretinde yapılmış eserlerin plastik değerleri ve bu eserler üzerinden, Alevi ve Bektaşi erkânında insan olmak, insan suretinin sîrete nasıl dönüştürüldüğü; insan suretinde yazılan “Allah-Muhammed-Ali” isimlerinin görünmeyenden nasıl görünür kılındığı anlatılmaya çalışılmıştır. Meleklerin Âdem’e secde ettikleri andan bugüne niçin İnsan’a secde edildiğine ve bunun Alevi ve Bektaşi erkânında taşıdığı anlamlara dair bilgi verilmiştir.Yayın Quantum Zeno repeaters(Nature Research, 2022-09-12) Bayrakçı, Veysel; Özaydın, FatihQuantum repeaters pave the way for long-distance quantum communications and quantum Internet, and the idea of quantum repeaters is based on entanglement swapping which requires the implementation of controlled quantum gates. Frequently measuring a quantum system affects its dynamics which is known as the quantum Zeno effect (QZE). Beyond slowing down its evolution, QZE can be used to control the dynamics of a quantum system by introducing a carefully designed set of operations between measurements. Here, we propose an entanglement swapping protocol based on QZE, which achieves almost unit fidelity. Implementation of our protocol requires only simple frequent threshold measurements and single particle rotations. We extend the proposed entanglement swapping protocol to a series of repeater stations for constructing quantum Zeno repeaters which also achieve almost unit fidelity regardless of the number of repeaters. Requiring no controlled gates, our proposal reduces the quantum circuit complexity of quantum repeaters. Our work has potential to contribute to long distance quantum communications and quantum computing via quantum Zeno effect.Yayın Superactivating bound entanglement in quantum networks via quantum Zeno dynamics and a novel algorithm for optimized Zeno evolution(MDPI, 2023-01) Özaydın, Fatih; Bayrakçı, Veysel; Altıntaş, Azmi Ali; Bayındır, CihanAn arbitrary amount of entanglement shared among nodes of a quantum network might be nondistillable if the nodes lack the information on the entangled Bell pairs they share. Making such a system distillable, which is called the superactivation of bound entanglement (BE), was shown to be possible through systematic quantum teleportation between the nodes, requiring the implementation of controlled-gates scaling with the number of nodes. In this work, we show in two scenarios that the superactivation of BE is possible if nodes implement the proposed local quantum Zeno strategies based on only single qubit rotations and simple threshold measurements. In the first scenario we consider, we obtain a two-qubit distillable entanglement system as in the original superactivation proposal. In the second scenario, we show that superactivation can be achieved among the entire network of eight qubits in five nodes. In addition to obtaining all-particle distillable entanglement, the overall entanglement of the system in terms of the sum of bipartite cuts is increased. We also design a general algorithm with variable greediness for optimizing the QZD evolution tasks. Implementing our algorithm for the second scenario, we show that a significant improvement can be obtained by driving the initial BE system into a maximally entangled state. We believe our work contributes to quantum technologies from both practical and fundamental perspectives bridging nonlocality, bound entanglement and the quantum Zeno dynamics among a quantum network.Yayın A review of recent innovations in remote health monitoring(Multidisciplinary Digital Publishing Institute (MDPI), 2023-12) Dalloul, Ahmed Hany; Miramirkhani, Farshad; Kouhalvandi, LidaThe development of remote health monitoring systems has focused on enhancing healthcare services’ efficiency and quality, particularly in chronic disease management and elderly care. These systems employ a range of sensors and wearable devices to track patients’ health status and offer real-time feedback to healthcare providers. This facilitates prompt interventions and reduces hospitalization rates. The aim of this study is to explore the latest developments in the realm of remote health monitoring systems. In this paper, we explore a wide range of domains, spanning antenna designs, small implantable antennas, on-body wearable solutions, and adaptable detection and imaging systems. Our research also delves into the methodological approaches used in monitoring systems, including the analysis of channel characteristics, advancements in wireless capsule endoscopy, and insightful investigations into sensing and imaging techniques. These advancements hold the potential to improve the accuracy and efficiency of monitoring, ultimately contributing to enhanced health outcomes for patients.Yayın A split-step Fourier scheme for the dissipative Kundu-Eckhaus equation and its rogue wave dynamics(Işık University Press, 2021-01) Bayındır, Cihan; Yurtbak, HazalWe investigate the rogue wave dynamics of the dissipative Kundu-Eckhaus equation. With this motivation, we propose a split-step Fourier scheme for its numerical solution. After testing the accuracy and stability of the scheme using an analytical solution as a benchmark problem, we analyze the chaotic wave fields generated by the modulation instability within the frame of the dissipative Kundu-Eckhaus equation. We discuss the effects of various parameters on rogue wave formation probability and we also discuss the role of dissipation on occurrences of such waves.Yayın Mindfulness in the relationship between perceived stress and quality of life in pediatric asthma(İstanbul Üniversitesi, 2023-03-27) Ayhan, Ayşe Sena; Aktan, Zekeriya Deniz; Ülker Tamay, ZeynepObjective: The purpose of this study is to analyze the possible mediatör effect of mindfulness in the relationship between perceived stress and quality of life in pediatric asthma. Material and Method: The sample of this study consisted of 100 asthmatic children aged between 9-12 years who applied to the outpatient clinic of Istanbul University, Istanbul Faculty of Medicine, Division of Pediatric Allergy. Sociodemographic information forms, Perceived Stress Scale in Children (8-11 years), Child and Adolescent Mindfulness Measure (CAMM), and Pediatric Asthma Quality of Life Questionnaire (PAQLQ) were used as data collection tools. Linear hierarchical regression analysis was used during the process of analyzing data. Results: It has been identified that mindfulness has a partial mediatör effect on the relationship between perceived stress and quality of life (p = 0.000). The presence of a partial mediator effect of mindfulness has been determined in the relationship between perceived stress and symptoms which is the subscale of quality of life (p = 0.000). Finally, it has been demonstrated that mindfulness has a partial mediator effect on the relationship between perceived stress and emotional function which is another subscale of quality of life (p = 0.000). The mediating role of mindfulness in the relationship between perceived stress and activity limitations could not be analyzed due to the lack of a significant correlation between activity limitations which is the subscale of quality of life and mindfulness (p=0.178). Conclusion: It can be helpful to add psychotherapy interventions involving mindfulness practices to asthma treatment for better control of the disease in children.Yayın Adaptive locally connected recurrent unit (ALCRU)(Springer Science and Business Media Deutschland GmbH, 2025-07-03) Özçelik, Şuayb Talha; Tek, Faik BorayResearch has shown that adaptive locally connected neurons outperform their fully connected (dense) counterparts, motivating this study on the development of the Adaptive Locally Connected Recurrent Unit (ALCRU). ALCRU modifies the Simple Recurrent Neuron Model (SimpleRNN) by incorporating spatial coordinate spaces for input and hidden state vectors, facilitating the learning of parametric local receptive fields. These modifications add four trainable parameters per neuron, resulting in a minor increase in computational complexity. ALCRU is implemented using standard frameworks and trained with back-propagation-based optimizers. We evaluate the performance of ALCRU using diverse benchmark datasets, including IMDb for sentiment analysis, AdditionRNN for sequence modelling, and the Weather dataset for time-series forecasting. Results show that ALCRU achieves accuracy and loss metrics comparable to GRU and LSTM while consistently outperforming SimpleRNN. In particular, experiments with longer sequence lengths on AdditionRNN and increased input dimensions on IMDb highlight ALCRU’s superior scalability and efficiency in processing complex data sequences. In terms of computational efficiency, ALCRU demonstrates a considerable speed advantage over gated models like LSTM and GRU, though it is slower than SimpleRNN. These findings suggest that adaptive local connectivity enhances both the accuracy and efficiency of recurrent neural networks, offering a promising alternative to standard architectures.
- «
- 1 (current)
- 2
- 3
- »
