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Article: Individuals' conceptions of COVID-19 pandemic through metaphor analysis.

Gök, Ayşe / Kara, Ahmet

Current psychology (New Brunswick, N.J.)

2021 Volume 41, Issue 1, Page(s) 449–458

Abstract: The main purpose of the current study is to investigate the perceptions of individuals' living in Turkey during the COVID-19 pandemic through metaphor analysis. The current study employed the descriptive phenomenological design, one of the qualitative ... ...

Abstract	The main purpose of the current study is to investigate the perceptions of individuals' living in Turkey during the COVID-19 pandemic through metaphor analysis. The current study employed the descriptive phenomenological design, one of the qualitative research methods. A total of 210 individuals living in Turkey (114 females (68.6%) and 66 males (31.4%)) participated in the current study through an online questionnaire on a voluntary basis. As the data collection tool, the online questionnaire form developed by the researchers was used. The collected data were analyzed within the framework of five-stage metaphor analysis. As a result of the analysis, a total of seven metaphor categories called
Language	English
Publishing date	2021-03-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	2021598-8
ISSN	1936-4733 ; 1046-1310
ISSN (online)	1936-4733
ISSN	1046-1310
DOI	10.1007/s12144-021-01506-z
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Book ; Online: From Shapley Value to Model Counting and Back

Kara, Ahmet / Olteanu, Dan / Suciu, Dan

2023

Abstract: In this paper we investigate the problem of quantifying the contribution of each variable to the satisfying assignments of a Boolean function based on the Shapley value. Our main result is a polynomial-time equivalence between computing Shapley values ... ...

Abstract	In this paper we investigate the problem of quantifying the contribution of each variable to the satisfying assignments of a Boolean function based on the Shapley value. Our main result is a polynomial-time equivalence between computing Shapley values and model counting for any class of Boolean functions that are closed under substitutions of variables with disjunctions of fresh variables. This result settles an open problem raised in prior work, which sought to connect the Shapley value computation to probabilistic query evaluation. We show two applications of our result. First, the Shapley values can be computed in polynomial time over deterministic and decomposable circuits, since they are closed under OR-substitutions. Second, there is a polynomial-time equivalence between computing the Shapley value for the tuples contributing to the answer of a Boolean conjunctive query and counting the models in the lineage of the query. This equivalence allows us to immediately recover the dichotomy for Shapley value computation in case of self-join-free Boolean conjunctive queries; in particular, the hardness for non-hierarchical queries can now be shown using a simple reduction from the #P-hard problem of model counting for lineage in positive bipartite disjunctive normal form. Comment: 22 pages
Keywords	Computer Science - Databases ; Computer Science - Computational Complexity ; Computer Science - Logic in Computer Science ; F.4.1 ; F.2 ; H.2
Subject code	511
Publishing date	2023-06-25
Publishing country	us
Document type	Book ; Online
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Book ; Online: F-IVM

Kara, Ahmet / Nikolic, Milos / Olteanu, Dan / Zhang, Haozhe

Analytics over Relational Databases under Updates

2023

Abstract: This article describes F-IVM, a unified approach for maintaining analytics over changing relational data. We exemplify its versatility in four disciplines: processing queries with group-by aggregates and joins; learning linear regression models using the ...

Abstract	This article describes F-IVM, a unified approach for maintaining analytics over changing relational data. We exemplify its versatility in four disciplines: processing queries with group-by aggregates and joins; learning linear regression models using the covariance matrix of the input features; building Chow-Liu trees using pairwise mutual information of the input features; and matrix chain multiplication. F-IVM has three main ingredients: higher-order incremental view maintenance; factorized computation; and ring abstraction. F-IVM reduces the maintenance of a task to that of a hierarchy of simple views. Such views are functions mapping keys, which are tuples of input values, to payloads, which are elements from a ring. F-IVM also supports efficient factorized computation over keys, payloads, and updates. Finally, F-IVM treats uniformly seemingly disparate tasks. In the key space, all tasks require joins and variable marginalization. In the payload space, tasks differ in the definition of the sum and product ring operations. We implemented F-IVM on top of DBToaster and show that it can outperform classical first-order and fully recursive higher-order incremental view maintenance by orders of magnitude while using less memory.
Keywords	Computer Science - Databases
Subject code	005
Publishing date	2023-03-15
Publishing country	us
Document type	Book ; Online
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Book ; Online: Insert-Only versus Insert-Delete in Dynamic Query Evaluation

Khamis, Mahmoud Abo / Kara, Ahmet / Olteanu, Dan / Suciu, Dan

2023

Abstract: We study the dynamic query evaluation problem: Given a join query Q and a stream of updates, we would like to construct a data structure that supports constant-delay enumeration of the query output after each update. We show that a stream of N insert- ... ...

Abstract	We study the dynamic query evaluation problem: Given a join query Q and a stream of updates, we would like to construct a data structure that supports constant-delay enumeration of the query output after each update. We show that a stream of N insert-only updates (to an initially empty database) can be executed in total time O(N^{w(Q)}), where w(Q) is the fractional hypertree width of Q. This matches the complexity of the static query evaluation problem for Q and a database of size N. One corollary is that the average time per single-tuple insert is constant for acyclic joins. In contrast, we show that a stream of N insert-and-delete updates to Q can be executed in total time O(N^{w(Q')}), where Q' is obtained from Q by extending every relational atom with extra variables that represent the "lifespans" of tuples in Q. We show that this reduction is optimal in the sense that the static evaluation runtime of Q' provides a lower bound on the total update time of Q. Our approach recovers the optimal single-tuple update time for known queries such as the hierarchical and Loomis-Whitney join queries.
Keywords	Computer Science - Databases
Subject code	005
Publishing date	2023-12-14
Publishing country	us
Document type	Book ; Online
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Book ; Online: Conjunctive Queries with Free Access Patterns under Updates

Kara, Ahmet / Nikolic, Milos / Olteanu, Dan / Zhang, Haozhe

2022

Abstract: We study the problem of answering conjunctive queries with free access patterns under updates. A free access pattern is a partition of the free variables of the query into input and output. The query returns tuples over the output variables given a tuple ...

Abstract	We study the problem of answering conjunctive queries with free access patterns under updates. A free access pattern is a partition of the free variables of the query into input and output. The query returns tuples over the output variables given a tuple of values over the input variables. We introduce a fully dynamic evaluation approach for such queries. We also give a syntactic characterisation of those queries that admit constant time per single-tuple update and whose output tuples can be enumerated with constant delay given an input tuple. Finally, we chart the complexity trade-off between the preprocessing time, update time and enumeration delay for such queries. For a class of queries, our approach achieves optimal, albeit non-constant, update time and delay. Their optimality is predicated on the Online Matrix-Vector Multiplication conjecture. Our results recover prior work on the dynamic evaluation of conjunctive queries without access patterns. Comment: Extended and polished version. Title changed. Section 4 on the evaluation of arbitrary conjunctive queries with free access patterns is new
Keywords	Computer Science - Databases ; H.2.4
Subject code	005
Publishing date	2022-06-17
Publishing country	us
Document type	Book ; Online
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Article ; Online: Effect of Bioabsorbable Poly (dl-Lactide ε-Caprolactone) on Healing of Experimentally Injured Acute Traumatic Middle Ear Mucosa Damage.

İlhan, Necati / Kara, Ahmet / Şahin, Elvan / Yılmaz, Mahmut Sinan / Güven, Mehmet / Erdoğan, Miyase / Demir, Deniz

The journal of international advanced otology

2023 Volume 19, Issue 3, Page(s) 206–211

Abstract: Background: Postoperative adhesion is an important complication after middle-ear surgeries. Although many materials have been tried to prevent this complication, the use of Poly (dl-lactide ε-caprolactone) as an anti-adhesive material after middle-ear ... ...

Abstract	Background: Postoperative adhesion is an important complication after middle-ear surgeries. Although many materials have been tried to prevent this complication, the use of Poly (dl-lactide ε-caprolactone) as an anti-adhesive material after middle-ear surgery has not yet been reported. The aim of this study was to evaluate the anti-adhesive effect of poly (dl-lactide ε-caprolactone) on the ears of rats with middle-ear mucosa damage. Methods: In our study, 14 Wistar albino rats and 28 ears in total were used. The rats were randomly divided into 4 groups. Middle ear mucosa damage was performed in all groups with a transcanal approach under otomicroscopy in sterile conditions. The effects of poly (dl-lactide ε-caprolactone), silicone sheet, and absorbable gelatin sponge were compared histologically with the secondary healing group. In addition, hearing evaluation was performed before the procedure and on the 28th postoperative day. Results: No significant difference was observed in transient otoacoustic emission and distortion product otoacoustic emissions tests performed before and after the surgical procedure when the groups were compared. While adhesion was observed in the tympanic membrane in the absorbable gelatin sponge group, no adhesion was observed in the other groups. In the absorbable gelatin sponge group, increased fibroblastic activity, inflammation, and neovascularization were observed in the middle-ear mucosa. No significant difference was observed in silicone sheet, poly (dl-lactide ε-caprolactone), and control groups in terms of fibroblastic activity, inflammation, and neovascularization. Conclusion: It can be concluded that absorbable poly (dl-lactide ε-caprolactone) is nonototoxic and biocompatible with the rat's middle ear cavity by short-term evaluation.
MeSH term(s)	Animals ; Rats ; Absorbable Implants ; Rats, Wistar ; Ear, Middle/surgery ; Ear, Middle/pathology ; Silicones ; Inflammation/pathology ; Mucous Membrane
Chemical Substances	caprolactone (56RE988L1R) ; dilactide (95-96-5) ; Silicones
Language	English
Publishing date	2023-06-05
Publishing country	Turkey
Document type	Journal Article
ZDB-ID	2561231-1
ISSN	2148-3817 ; 1308-7649 ; 2148-3817
ISSN (online)	2148-3817
ISSN	1308-7649 ; 2148-3817
DOI	10.5152/iao.2023.22883
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Book ; Online: Machine Learning over Static and Dynamic Relational Data

Kara, Ahmet / Nikolic, Milos / Olteanu, Dan / Zhang, Haozhe

2021

Abstract: This tutorial overviews principles behind recent works on training and maintaining machine learning models over relational data, with an emphasis on the exploitation of the relational data structure to improve the runtime performance of the learning task. ...

Abstract	This tutorial overviews principles behind recent works on training and maintaining machine learning models over relational data, with an emphasis on the exploitation of the relational data structure to improve the runtime performance of the learning task. The tutorial has the following parts: 1) Database research for data science 2) Three main ideas to achieve performance improvements 2.1) Turn the ML problem into a DB problem 2.2) Exploit structure of the data and problem 2.3) Exploit engineering tools of a DB researcher 3) Avenues for future research Comment: arXiv admin note: text overlap with arXiv:2008.07864
Keywords	Computer Science - Databases
Publishing date	2021-07-29
Publishing country	us
Document type	Book ; Online
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Article ; Online: A different option in vascular bone grafts in the hand and wrist region: Use of a dorsoulnar artery-based osteo-fascio-cutaneous flap: A case series.

Orman, Osman / Eren, Fikret / Kara, Ahmet Duran / Cesur, Ceyhun / Yıldırım, Cengiz / Aysal, Bilge Kağan

Joint diseases and related surgery

2021 Volume 32, Issue 2, Page(s) 504–513

Abstract: Objectives: This study aims to describe our surgery technique and discuss patients treated through the dorsoulnar artery (DUA)-based technique of osseous and osteo-fascio-cutaneous vascularized ulnar bone grafting.: Patients and methods: Between ... ...

Abstract	Objectives: This study aims to describe our surgery technique and discuss patients treated through the dorsoulnar artery (DUA)-based technique of osseous and osteo-fascio-cutaneous vascularized ulnar bone grafting. Patients and methods: Between January 2011 and January 2015, six male patients (median age: 22.5 years; range, 20 to 24 years) who underwent surgery during which the technique of DUA ulnar bone graft was utilized. One patient with scaphoid nonunion, three patients with Kienböck's disease, and two patients with a traumatic metacarpal defect were retrospectively evaluated. The joint range of motion (ROM), grip strength, Disabilities of the arm, shoulder and Hand (DASH) questionnaire score and Visual Analog Scale (VAS) score, and radiographies before and after surgery were examined. Scintigraphy was performed at 12 weeks postoperatively to monitor the viability of the bone graft. Results: All patients showed improvements in the ROM, grip strength, VAS, and DASH scores. According to the radiographic examination, bone union was achieved in all patients and the scintigraphy revealed that vascularization was detected in the bone tissue. Conclusion: The advantages of DUA-based vascularized bone graft are good bone quality and quantity and versatility due to its long pedicle. The osteo-fasio-cutaneous DUA flap seems to be effective in the treatment of traumatic metacarpal bone defects accompanied by skin loss. The DUA-based vascularized ulnar bone may be a source for scaphoid and lunate biological bone reconstruction.
MeSH term(s)	Bone Transplantation/methods ; Bone Transplantation/statistics & numerical data ; Hand/surgery ; Humans ; Male ; Retrospective Studies ; Surgical Flaps/statistics & numerical data ; Turkey ; Wrist/surgery ; Wrist Joint/surgery ; Young Adult
Language	English
Publishing date	2021-06-11
Publishing country	Turkey
Document type	Journal Article
ISSN	2687-4792
ISSN (online)	2687-4792
DOI	10.52312/jdrs.2021.79298
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Article ; Online: Age-dependent differences of the depth of olfactory fossa in children.

Güven, Mehmet / Elden, Halil / Yaylacı, Atılay / Güven, Ebru Mihriban / Kara, Ahmet / Orha, Ayla Tekin

Brazilian journal of otorhinolaryngology

2021

Abstract: Objective: With this radio-anatomical study, we aimed to describe the distribution of the depth of the olfactory fossa based on the Keros classification in the pediatric population in our region and to reduce complication rates by providing normative ... ...

Abstract	Objective: With this radio-anatomical study, we aimed to describe the distribution of the depth of the olfactory fossa based on the Keros classification in the pediatric population in our region and to reduce complication rates by providing normative data. Methods: This was a retrospective study conducted with computed tomography imaging of the paranasal sinuses of 390 pediatric patients referred over a six-year period in Sakarya and Kocaeli University Faculty of Medicine. Patients were divided into 3 groups as 1-6, 6-12, and 12-18 years old. The depth of the olfactory fossa was measured and classified according to the Keros classification. The incidence of Keros asymmetries was also investigated. Results: The distribution of the depth of a total of 780 olfactory fossa according to the Keros classification was 24.7% Keros I, 65.9% Keros II, and 9.4% Keros III. When the groups were evaluated with each other and within each group, it was seen that the prevalence of Keros I type was significantly higher in the first group (p<0.05), and the prevalence of Keros type II was significantly higher in the second and third groups (p<0.05). Apart from this, the number of Keros type III increased in the third group compared to the first two groups and showed a statistically significant difference (p<0.05). Among all patients, asymmetry of the olfactory fossa was detected in 29 patients (7.4%). Although the number of olfactory fossa asymmetry was low in group I, it was not significantly different between the groups (p>0.05). Conclusion: In our study, high Keros I rate and low Keros III rate in children aged 1-6 were remarkable. Especially for children under the age of six, questions arise about the validity of the Keros classification. More detailed studies in larger populations, in different ethnicities, and with various age groups are needed. Level of evidence: Level 3.
Language	English
Publishing date	2021-11-05
Publishing country	Brazil
Document type	Journal Article
ZDB-ID	2428110-4
ISSN	1808-8686 ; 1808-8694
ISSN (online)	1808-8686
ISSN	1808-8694
DOI	10.1016/j.bjorl.2021.09.006
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Book ; Online: F-IVM

Nikolic, Milos / Zhang, Haozhe / Kara, Ahmet / Olteanu, Dan

Learning over Fast-Evolving Relational Data

2020

Abstract: F-IVM is a system for real-time analytics such as machine learning applications over training datasets defined by queries over fast-evolving relational databases. We will demonstrate F-IVM for three such applications: model selection, Chow-Liu trees, and ...

Abstract	F-IVM is a system for real-time analytics such as machine learning applications over training datasets defined by queries over fast-evolving relational databases. We will demonstrate F-IVM for three such applications: model selection, Chow-Liu trees, and ridge linear regression. Comment: SIGMOD DEMO 2020, 5 pages
Keywords	Computer Science - Databases
Publishing date	2020-05-31
Publishing country	us
Document type	Book ; Online
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