176 research outputs found
Effect of pozzolanic material on the restrained shrinkage behavior of self-consolidating concrete
No full textSelf-consolidating concrete (SCC) has been the subject of various research projects, and its use has been a source of increasing interest in industry. The very early phase of SCC research mainly focused on mechanical and fresh concrete properties. The area of SCC research was then enlarged with the inclusion of shrinkage behavior. This was necessary because SCC as a concrete type was always presumed to exhibit higher levels of free and restrained shrinkage due to its higher cementitious material content. Given that concrete in general has very low tensile strength capacity, especially the deformations caused by restrained shrinkage behavior are among the primary concerns related to SCC. Restrained shrinkage behavior of SCC is investigated in this study, with the emphasis on cracking ages and patterns. The AASHTO-T334 test setup is used to evaluate the cracking potential of the SCC mixes. In addition to the steel ring data collection method of AASHTO-T334, Vibrating Wire Sensor Gages (VWSG) were also implemented to collect concrete strain measurements. Many other laboratory tests such as the compressive strength, splitting tensile strength, modulus of elasticity, and free shrinkage were performed in companion with the restrained shrinkage test. The resistance to restrained shrinkage cracking of the SCC was found to be weak since all the SCC mixes cracked under restrained shrinkage before day 56 after casting. Moreover, except for one SCC mix, the cracking was observed only between day 19 and 31 after casting. Amount of total cementitious material was found to have the greatest effect on the restrained and free shrinkage performance of the SCC mixes. Partial replacement of Portland cement with high percentages of fly ash was found to have the potential to increase the elapsed time until cracking. If silica fume was used as a replacement, the cracking performance was slightly worse whereas the free shrinkage strain increased 10 % at day 56 after casting.M.S.Includes abstractIncludes bibliographical referencesby Ufuk Ate
Non-contact estimation of heart rate and oxygen saturation using ambient light
No full text0000-0003-0345-6989WOS: 000347474800009PubMed ID: 25657877We propose a robust method for automated computation of heart rate (HR) from digital color video recordings of the human face. In order to extract photoplethysmographic signals, two orthogonal vectors of RGB color space are used. We used a dual tree complex wavelet transform based denoising algorithm to reduce artifacts (e. g. artificial lighting, movement, etc.). Most of the previous work on skin color based HR estimation performed experiments with healthy volunteers and focused to solve motion artifacts. In addition to healthy volunteers we performed experiments with child patients in pediatric intensive care units. In order to investigate the possible factors that affect the non-contact HR monitoring in a clinical environment, we studied the relation between hemoglobin levels and HR estimation errors. Low hemoglobin causes underestimation of HR. Nevertheless, we conclude that our method can provide acceptable accuracy to estimate mean HR of patients in a clinical environment, where the measurements can be performed remotely. In addition to mean heart rate estimation, we performed experiments to estimate oxygen saturation. We observed strong correlations between our SpO2 estimations and the commercial oximeter readings (C) 2014 Optical Society of AmericaScientific Research Projects Coordination Unit of Mugla Sitki Kocman UniversityMugla Sitki Kocman University [13/108]This study was supported by Scientific Research Projects Coordination Unit of Mugla Sitki Kocman University, project number 13/108. The author wishes to thank Dr. Alkan Bal for his comments and help in conducting the PICU experiments
Message from editor
No full textDear Readers,

It is a great honor for us to publish Volume 7, Issue 3 of Global Journal of Computer Sciences: Theory and Research. 

Global Journal of Computer Sciences: Theory and Research (GJCS) is an international online journal for scientists and professionals involved in all aspects of computer sciences. This journal serves as an international platform that fosters theoretical and practical issues and new applications for all scientists and professionals from the field of computer sciences including original research and innovative applications from all parts of the world.

Aim of this issue is to give the researchers an opportunity to share the results of their academic studies. There are different research topics discussed in the articles. For example, Farag Homed Ali Kuwil examined the effectiveness measurement of spectral clustering algorithm. Suat Karakaya, Gurkan Kucukyildiz and Hasan Ocak presented a dynamic path planning method for wheeled mobile robots (Dyna-bug). In addition, Gurkan Kucukyildiz, Suat Karakaya and Hasan Ocak proposed a model for the classification of multi-class motor imaginary in EEG using random forest (RF) classifier. Suat Karakaya, Ufuk Akkaya, Nurullah Sekerci, Adem Karagoz, Ali Ugur Ozay, Gurkan Kucukyildiz and Hasan Ocak discussed virtual-reality-based remote-controlled mobile robot platform. Finally, Papa Djassi examined the effects of fixed and roaming CN on MIPv6 networks.

A total number of twelve (12) manuscripts were submitted for this issue and each paper has been subjected to double-blind peer review process by the reviewers specialized in the related field. At the end of the review process, a total number of five (5) high quality research papers were selected and accepted for publication.

We present many thanks to all the contributors who helped us to publish this issue.

Best regards,

Prof. Dr. Dogan Ibrahim

Editor – in Chief



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The role of local actors in the Syrian civil war and Turkey'sapproach to the conflict in Syria (2011-2018)
No full text2011 Mart ayında Suriye'nin Dera kentinde başlayan gösteriler, güvenlik güçlerinin sert müdahaleleri sonrası tüm ülkeye yayılmıştır. Zamanla artan gösteri ve protestolar ülkedeki barış ve istikrar ortamını bozarak yerini sokak çatışmaları ve iç savaşa bırakmıştır. Suriye'de gerçekleşen bu yeni konjonktür karşısında yerel, bölgesel ve küresel aktörlerinde olaylara müdahil olmasıyla ülkedeki durum vekalet savaşına dönüşmüştür. Çin ve Rusya'nın hükümet yanlısı, ABD ve AB'nin hükümet karşıtı politikalar sürdürmesi ülkedeki çözüm arayışlarını olumsuz etkileyerek sürecin uzamasına ve barışın tesis edilememesine neden olmuştur. Türkiye, Suriye'de yaşanan gelişmeleri başından itibaren takip etmiş, sorunun çözümüne ilişkin Esad Rejimine reformlar konusunda çağrıda bulunmuştur. Esad'ın bu süreçte Türkiye'nin beklentilerini dikkate almaması üzerine Türkiye, diplomatik girişimlerde bulunarak krizin büyümemesi yönünde çaba göstermiştir. Türkiye güney sınırında yaşanan krizin güvenliğini tehdit eder duruma dönüşmesinin ardından etkin güvenlik politikaları üreterek sınır ötesi harekatlar gerçekleştirmiştir. Bu çalışma, Suriye'de yaşanan olayları anlamlandırmak ve arka planını görmek adına kapsamlı bir inceleme ortaya koymaktadır. Çalışmada tarihsel bağlamda devlet kurulma süreci, Fransız manda idaresi ve darbeler dönemine değinilerek sonrasında Ortadoğu'da çıkan isyanların Suriye'ye yansımaları tüm taraflarıyla ve aktörleriyle değerlendirilmiştir. İç savaşın sonlanmasına yönelik Arap Birliği ve Birleşmiş Milletlerin çözüm arayışlarına da değinilerek bu kapsamda Cenevre görüşmeleri detaylı olarak ele alınmıştır. Ayrıca Suriye iç savaşında bölgede oluşan terör gruplarının Türkiye'nin sınır güvenliğini ve iç dinamiklerini etkilemesi sonucu Türkiye'nin değişen güvenlik gündemi değerlendirilmiştir.The demonstrations that have started in the city of Dera, in Syria on March 2011, spread across the country after the brutal intervention by the Syrian security forces. Increasing demonstrations and protests over time led to violent clashes on the streets of Syria and a civil war engulfed the country. The conflict in Syria evolved into a "proxy war" as the regional and international actors started to get involved. While China and Russia supported pro-Syrian regime decisions and solutions, the EU and the USA supported the anti-regime decisions and solutions, consequently prolonging the conflict and delaying a peaceful solution. Turkey has been following the developments in Syria closely from its early stage and calling the Assad regime for reforms. Turkey hoping for crisis to lessen, adopted a diplomatic way to convince and prevent Assad regime to cease the violent crackdown. However, due to its close proximity with Syria, Turkish bordering cities have been targeted by the armed groups, which led Turkey to run cross-border military operations to secure its bordering area. In this thesis, the author intends to provide a comprehensive study on Syrian Civil War and its background. We include the historical background of Syria's state formation, the French mandate administration; the period of military coup d'états and the effect of Middle East uprisings to Syrian state and political actors. This study covers the efforts of the Arab League and United Nations in providing a peaceful solution to the conflict; lastly the Geneva Talks in detail has been included in the research. Furthermore, the changes in national security policies of Turkey due to increasing security threats from Syrian border and the terrorist groups in Syria has been studied extensively
A signal processing approach to ultrasound localization microscopy
No full textUltrasound Localization Microscopy (ULM) offers a cost-effective modality for microvascular imaging by using intravascular contrast agents (microbubbles). However, ULM has a fundamental trade-off between acquisition time and spatial resolution, which makes clinical translation challenging. In this thesis, in order to circumvent the trade-off, we pose the localization problem as a signal processing problem and introduce a filtering operation that is capable of separating microbubble contrast agents into different subgroups based on their vector velocities while simultaneously offering blood velocity mapping at super resolution, without tracking individual microbubbles.
We define the filtering operation in three-dimensional (3D) Fourier domain and provide rigorous theoretical analysis on the performance of the filtering operation. Numerical experiments validate that the proposed filtering method is able to separate the microbubbles with respect to the speed and direction of their motion. In combination with subsequent localization of microbubble centers, e.g. by matched filtering, velocity filter signicantly improves the quality of reconstructed vessel structure map and provides blood flow information. Overall, the proposed imaging pipeline in this thesis, eliminates the need of using diluted microbubble injections to improve image quality, thus helping to circumvent the trade-off between acquisition time and spatial resolution. Conveniently, because the velocity filtering operation can be implemented by fast Fourier transforms (FFTs) it admits fast, and potentially real-time realization. We believe that the proposed filtering method has the potential to pave the way to clinical translation of ULM.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-08-01The student, Ufuk Soylu, accepted the attached license on 2020-07-07 at 16:01.The student, Ufuk Soylu, submitted this Thesis for approval on 2020-07-07 at 16:51.This Thesis was approved for publication on 2020-07-08 at 14:37.DSpace SAF Submission Ingestion Package generated from Vireo submission #15515 on 2020-10-02 at 15:49:54Made available in DSpace on 2020-10-07T22:49:48Z (GMT). No. of bitstreams: 2
SOYLU-THESIS-2020.pdf: 8154525 bytes, checksum: 7a33435e4bebd295579bd34670a44088 (MD5)
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A Note On Lamarle Formula Inminkowski 3-Space
No full textNesovic, Emilija/0000-0003-3600-0486; Ozturk, Ufuk/0000-0002-8800-7869The Lamarle formula is known as a simple relation between the Gaussian curvature and the distribution parameter of a non-developable ruled surface. In this paper, we obtain the Lamarle formula of a non-developable ruled surface with pseudo null base curve and null director vector field inMinkowski 3-space. We also obtain the corresponding striction line and distribution parameter of such surface. We prove that there is no Lamarle formula when the director vector field is spacelike and its derivative is null, because the ruled surface in that case is a lightlike plane. Finally, we give some examples.Serbian Ministry of Education, Science and Technological Development [174012]The last author was partially supported by the Serbian Ministry of Education, Science and Technological Development (grant number 174012)
The relationship between spiritual well-being and hopelessness levels of substance users
No full textThis study was carried out to investigate the effect of the spiritual well-being of the individuals diagnosed with substance use disorder on their level of hopelessness. The sample of this study consisted of 256 patients who were hospitalized with the diagnosis of substance use disorder in an alcohol and druc addcition treatment center (ADATC) between October 1, 2018 and April 1, 2019. Patients who did not accept to participate in the study and repeated hospitalizations were excluded. The study was carried out with remaining 201 patients. Data were collected using Sociodemographic Information Form, the Spiritual Well-being Scale and the Beck Hopelessness Scale. Mann Whitney U, Kruskal Wallis test and Spearman Correlation analyses were used in the evaluation of the data. The mean age of the participants was 28.59±8.54 and all participants were male. The total score of the participants from the Spiritual Well-being Scale was 109.89±15.88, and from the Beck Hopelessness Scale was 7.33±5.30. In the study, a negative relationship was found between spiritual well-being and hopelessness levels of the patients (p [Med-Science 2020; 9(1.000): 186-90
Cardiac beta-adrenoceptor expression is markedly depressed in Ossabaw swine model of cardiometabolic risk
No full textOssabaw swine have a thrifty genotype and consumption of excess calories induces many classical components of the metabolic syndrome, including obesity, insulin resistance, impaired glucose tolerance, dyslipidemia, hyperleptinemia, and hypertension. Earlier studies indicate that the metabolic syndrome is associated with diminished cardiac function; however, to what degree this impairment is associated with alterations in myocardial beta(1) - and beta(2) -adrenoceptor (AR) expression has not been fully elucidated. Accordingly, the present study was designed to investigate the effects of the metabolic syndrome on cardiac beta(1) - and beta(2)-AR expression. Studies were conducted on left ventricular tissue samples obtained from control lean and chronically (50 weeks) high-fat-fed obese animals. Chronic feeding significantly increased fasting plasma insulin, total cholesterol, triglycerides, blood glucose, systolic and diastolic blood pressure, and heart rate. Real-time polymerase chain reaction revealed no significant alterations in cardiac beta(1) - and beta(2) - AR mRNA expression. In contrast, Western blot analysis revealed a significant decrease in ventricular beta(1) - and beta(2)-AR protein expression. This is the first report in a novel large animal model that induction of metabolic syndrome is accompanied by a significant reduction in cardiac beta(1) - and beta(2)-AR protein expression that could contribute to impaired cardiac function.National Institutes of HealthUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) - USA [HL67804, HL062552, RR013223]The author would like to thank Ridvan and Binnaz Ege (founder of Ufuk University School of Medicine) for their support, and also thanks Michael Sturek, Johnathan D Tune, and Mouhamad Alloosh (Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN) for their contributions. This work was supported by grants of the National Institutes of Health: HL67804 JD Tune; and HL062552 and RR013223 M Sturek. The author would also like to thank Yang Gao for his technical assistance and contribution. All contributors gave their permission for this manuscript to be published independently from their own work
"Irresponsible lending" with a better informed lender
No full textWe present a simple model of personal finance in which an incumbent lender has an information advantage vis-a-vis both potential competitors and households. In order to extract more consumer surplus, a lender with sufficient market power may engage in "irresponsible"lending, approving credit even if this is knowingly against a household’s best interest. Unless rival lenders are equally well informed, competition may reduce welfare. This holds, in particular, if less informed rivals can free ride on the incumbent’s superior screening ability
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