5916 research outputs found
Sort by
MOCMIN: convex inferring of modular low-rank contact networks over COVID diffusion data
No full textSEIR (which consists of susceptible, exposed, infected, and recovered states) is a common diffusion model which could model different disease propagation dynamics across various domains such as influenza and COVID diffusion. As a motivation, across these domains, observing the node states is relatively easier than observing the network edges over which the diffusion is taking place, or it may not even be possible to observe the underlying network. This paper focuses on the problem of predicting modular low-rank human contact network edges only if a SEIR diffusion dynamics spreading among the human on their contact network can be observed. Such contact networks exhibit high modularity where the graph has dense connections between the vertices within modules, but sparse connections between vertices in different modules. We first formulate such inference problem as an optimization problem, discuss its convexity, and propose MOCMIN to optimally infer such unknown contacts of modular human contact network from COVID diffusion data. This modular contact network inference problem is important in the general case where human states such as infected with virus and recovered from virus can be identified more easily than the contacts between humans. Our contributions can be summarized as follows: (1) MOCMIN can handle noisy, incomplete, or undersampled diffusion data while inferring the unknown contact network; (2) The inferred contact networks are highly modular which cannot be ensured by the existing methods; (3) This paper applies MOCMIN to better understand COVID diffusion on contact network. We found MOCMIN to be accurate in modular real human contact network inference from COVID diffusion data under a number of challenging scenarios. As an example, such high school contact network can be inferred by tracking COVID diffusion among humans approximately 5% better than the compared methods by MOCMIN’s ability to model modularity of the network. Via such inference, we can also understand the details of COVID diffusion dynamics in real human contact network. Additionally, inferred human contact graphs nearly mimic the true contact network’s known graphical properties. Lastly, MOCMIN outperforms the competing approaches while estimating the synthetic networks.Publisher versio
Gençlerde başa çıkma yolları: Pozitif gelişim göstergelerinin ve temel psikolojik ihtiyaçların giderilmesinin rolü
No full textThe aim of the present study was to examine the relationship between coping resources that emerging adults have and their coping strategies as mediated by their stress appraisals. A path model was tested which links emerging adults' perception of both basic psychological needs satisfaction and frustration (autonomy, relatedness, competence), from their characteristics of positive youth development (confidence, competence, character, connection, care) to coping strategies (fatalistic, optimistic, problem-solving, helplessness) as through stress appraisals (threat, challenge, uncontrollability, control-by-self, control-by-other). A total of 466 emerging adults (359 females, 105 males, 2 other) aged between 18 and 30 (Mage = 22.7, SD= 2.89) completed a computer-assisted questionnaire. The path analysis indicated that emerging adults' control-by-self appraisal mediated the relationship between need satisfaction and three of the four coping strategies (i.e., optimistic, problem-solving and helplessness). Control-by-self appraisal mediated the relationship between need frustration and problem solving strategy, and the relationship between positive development and optimistic and problem-solving coping strategies. While uncontrollability appraisal mediated the link between need frustration and optimistic and problem-solving coping strategies, threat appraisal mediated the relationship between need frustration and helplessness coping strategy. The findings of this study identified important facilitators and frustrators of emerging adults' coping strategies.Bu çalışmanın amacı, genç yetişkinlerin başa çıkma kaynakları ve baş etme yöntemleri arasındaki stresi değerlendirme aracılığıyla olan ilişkiyi incelemektir. Genç yetişkinlerin temel psikolojik ihtiyaçlarının tatmin edilme ve engellenme (özerklik, ilişkisellik, yeterlilik) algılarını ve pozitif gelişim özelliklerini (kendin-güven, yeterlilik, karakter, ilişkileri ilgililik), stresi (bilişsel) değerlendirme (tehdit edici, kişilik gelişimi için fırsat, kontrol-dışı, kendilik kontrolü, diğerleri tarafından sağlanacak katkı ile kontrol edilebilir algılama) aracılığıyla başa çıkma yöntemlerine ( kaderci, iyimser, problem-çözücü, çaresizlik) bağlayan bir yol modeli varsayılmıştır. Toplamda 466 (359 kadın, 105 erkek, 2 diğer) genç yetişkinin katıldığı bu çalışmada (ortalama yaş =22.7, SS= 2.89, ranj=18-30), katılımcılar bilgisayar-destekli anket formunu doldurmuşlardır. Yol analizi, genç yetişkinlerin "kendilik kontrolü" değerlendirmesinin, ihtiyaç tatmini ve dört başa çıkma stratejisinin üçü (iyimser, problem-çözücü, çaresizlik) arasındaki ilişkiye aracılık ettiğini göstermiştir. "Kendilik kontrolü" değerlendirmesi, ihtiyaç engellenmesi ve problem-çözücü baş etme arasındaki ilişkiye ve pozitif gelişim özellikleri ve iyimser ve problem-çözücü baş etme arasındaki ilişkiye aracılık etmiştir. "Kontrol-dışı" değerlendirmesi ihtiyaç engellenmesi ve iyimser ve problem-çözücü baş etme arasındaki ilişkiye aracılık ederken, "tehdit adici" değerlendirme, ihtiyaç engellenmesi ve çaresizlik baş etme arasındaki ilişkiye aracılık etmiştir. Bu çalışmanın bulguları, genç yetişkinlerin baş etme yöntemlerinin önemli destekleyicilerini ve engelleyicilerini tespit etmiştir
Are tutor robots for everyone? The influence of attitudes, anxiety, and personality on robot-led language learning
No full textDo some individuals benefit more from social robots than others? Using a second language (L2) vocabulary lesson as an example, this study examined how individual differences in attitudes toward robots, anxiety in learning L2, and personality traits may be related to the learning outcomes. One hundred and two native Turkish-speaking adults were taught eight English words in a one-on-one lesson either with the NAO robot (N = 51) or with a human tutor (N = 51). The results in both production and receptive language tests indicated that, following the same protocol, the two tutors are fairly comparable in teaching L2 vocabulary. Negative attitudes toward robots and anxiety in L2 learning impeded participants from learning vocabulary in the robot tutor condition whereas the personality trait of extroversion negatively predicted vocabulary learning in the human tutor condition. This study is among the first to demonstrate how individual differences can affect learning outcomes in robot-led sessions and how general attitudes toward a type of device may affect the ways humans learn using the device.European Union’s Horizon 202
Current balancing circuit design for parallel LED strings in QDOT high bright TV with dual-transformer LLC resonant topology
No full textNew LED technologies demand slim designs with increased backlight power. When the parallel-connected LED strings are driven by multiple transformers, the magnetic coupling difference and the LED string voltage difference cause backlight current mismatch problem. This imbalance causes the line with low voltage to draw more current hence to create heat spots on the backlight causing reduced lifetime. This problem is observed as backlight fluctuation at the end-user side. In this study, a cost-effective balancing circuit is simulated and implemented for eight parallel-connected LED strings using two transformers in an LLC half-bridge resonant topology while meeting the power demand in a relatively slim design. For the 145W backlight power, the current mismatch was 57.59% when there was an 8% deviation in transformer leakage inductance and a 10% variation between LED string voltages. The temperature difference between the strings was measured as 31. 8°C taken at room temperature with the open back cover. With the balancing circuit, the LED current difference being reduced to 9.99%. When the string voltages are the same, the maximum deviation in the current is measured as 2.59%
Öğrenme güçlüğü olan çocukların Covid-19 pandemisine dair deneyimleri
No full textAll children, particularly those with special needs, have been adversely affected by the COVID-19 pandemic. This qualitative study explored the experiences of children with learning disabilities (LD) during the COVID-19 Pandemic. A criterion sample of twenty-three children ranging in ages from 7 to 10 (M= 8.56, SD= 1.12) from Turkey was interviewed. Thematic analysis was used to analyze the collected data. Six themes and thirteen subthemes were generated: 1) pre-pandemic activities, 2) activities during the pandemic, 3) perceived changes, 4) educational process, 5) feelings during the pandemic, and 6) support during the pandemic. Overall, findings from the present study provided insights into the experiences of children with LD during the COVID-19 pandemic. Themes and subthemes are discussed in the framework of Ecological Systems Theory.Başta özel ihtiyaçları olanlar olmak üzere tüm çocuklar COVID-19 salgın sürecinden olumsuz etkilenmiştir. Mevcut nitel çalışma, COVID-19 Pandemisi sırasında öğrenme güçlüğü (LD) olan çocukların deneyimlerini araştırdı. Türkiye'den 7-10 (Ort= 8.56, SS= 1.12) yaşları arasında 23 çocuktan oluşan bir ölçüt örneklem ile görüşme yapılmıştır. Toplanan verilerin analizinde tematik analiz kullanılmıştır. Altı tema ve on üç alt tema oluşturulmuştur: 1) pandemi öncesi faaliyetler, 2) pandemi sırasındaki faaliyetler, 3) algılanan değişiklikler, 4) eğitim süreci, 5) pandemi sırasındaki duygular, 6) pandemi sırasında destek. Genel olarak, bu çalışmadan elde edilen bulgular, COVID-19 pandemisi sırasında öğrenme güçlüğü olan çocukların deneyimlerine ilişkin içgörüler sağlamıştır. Temalar ve alt temalar Ekolojik Sistemler Teorisi çerçevesinde tartışılmıştır
Identification of unbalance characteristics of rotating machinery using a novel optimization-based methodology
No full textIn this study, a novel optimization-based method is proposed to determine the parameters of a rotating unbalance in a rotor-bearing system. For that purpose, the weighted sum of squared difference between the analytical and predicted unbalance response due to rotational unbalance is considered as the objective function. A hybrid algorithm integrating salp swarm algorithm and Nelder–Mead algorithms is presented for detecting unbalance magnitude and phase as the unbalance parameters. Parameters of the aforementioned optimization algorithm are determined systematically using the Taguchi design of experiments method. The efficiency of the proposed method is compared with various optimization algorithms in the literature. The optimization method is validated with different unbalances experimentally to consider the real-world conditions. The results show the superiority of the proposed hybrid algorithm in terms of the accuracy of the unbalance parameters and computational efficiency
Measurement of the production cross section for Z + b jets in proton-proton collisions at √s = 13 TeV
No full textThe measurement of the cross section for the production of a Z boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet is performed with proton-proton collision data at s=13 TeV. The data sample corresponds to an integrated luminosity of 137 fb-1, collected by the CMS experiment at the LHC during 2016-2018. The integrated cross sections for Z+≥1 b jet and Z+≥2 b jets are reported for the electron, muon, and combined channels. The fiducial cross sections in the combined channel are 6.52±0.04(stat)±0.40(syst)±0.14(theo) pb for Z+≥1 b jet and 0.65±0.03(stat)±0.07(syst)±0.02(theo) pb for Z+≥2 b jets. The differential cross section distributions are measured as functions of various kinematic observables that are useful for precision tests of perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections for Z+≥2b jets and Z+≥1 b jet processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100±0.005(stat)±0.007(syst)±0.003(theo). All measurements are compared with predictions from various event generators.BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contracts No. 675440, No. 724704, No. 752730, No. 758316, No. 765710, 824093, No. 884104, and COST Action No. CA16108 (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation `a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the F. R. S.-FNRS and FWO (Belgium) under the "Excellence of ScienceEOS"-be.h Project No. 30820817; the Beijing Municipal Science & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy-EXC 2121 "Quantum Universe"-390833306, and under Project No. 400140256-GRK2497; the Lendulet ("Momentum") Program and the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, the New National Excellence Program UNKP, the NKFIA research grants No. 123842, No. 123959, No. 124845, No. 124850, No. 125105, No. 128713, No. 128786, and No. 129058 (Hungary); the Council of Science and Industrial Research, India; the Latvian Council of Science; the Ministry of Science and Higher Education and the National Science Center, contracts Opus 2014/15/B/ST2/03998 and 2015/19/B/ST2/02861 (Poland); the Fundacao para a Ciencia e a Tecnologia, Grant No. CEECIND/01334/2018 (Portugal); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, Projects No. 14.W03.31.0026 and No. FSWW-20200008, and the Russian Foundation for Basic Research, Project No. 19-42-703014 (Russia); MCIN/AEI/10.
r 13039/501100011033, ERDF " a way of making Europe", and the Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu, grant No. MDM-2017-0765 and Programa Severo Ochoa del Principado de Asturias (Spain); the Stavros Niarchos Foundation (Greece); the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the Welch Foundation, Contract NO. C-1845; and the Weston Havens Foundation (USA).Publisher versio
Türkiye'deki ailelerde evlilik memnuniyetinin ortak ebeveynlik ilişkisine etkisi: Çift perspektifi
No full textCoparenting is an executive relationship in a family and refers to how parents interact with each other regarding child-rearing issues. Coparenting relationship is associated with many factors in family system including child and parent characteristics; parent and child adjustment; and relationships such as marital relationship. Dyadic-level overall interparental relationship is one of the most important factors in terms of quality of coparenting relationship (Kitzmann, 2000). Therefore, it is important to examine the association between marital and coparenting relationship. Although there are many studies that shows the association between marital and coparenting relationship, these are different concepts. According to family systems theory (Minuchin, 1985; Minuchin, 1974), it can be concluded that coparenting is an executive subsystem and interconnected with marital subsystem. However, less is known about the association between marital and coparenting relationship in Turkish families. Therefore, current study aimed to investigate the effects of marital satisfaction on coparenting relationship from a dyadic perspective in Turkish families with preschool age children. The participants comprised 249 married co-parent dyads (249 mothers and 249 fathers) having a child between the ages of 3 and 7 (M =56.96, SD =15.16). Both parents reported their marital satisfaction on Couples Satisfaction Index (Funk & Rogge, 2007) and coparenting relationship as three dimensions (cooperation, conflict and triangulation) on Coparenting Inventory for Parents with Preschoolers (CI-PA) (Pinquart & Teubert, 2015). Three different the actor–partner interdependence model (APIM) including marital satisfaction and coparenting cooperation; marital satisfaction and coparenting conflict; and marital satisfaction and coparenting triangulation were conducted to clarify the interdependence between partners and to test for possible actor and partner effects (Cook & Kenny, 2005). Results from actor partner interdependence models revealed that (1) marital satisfaction influenced coparenting cooperation positively for both parents (actor effect). Also, father's marital satisfaction had a positive effect on mother's coparenting cooperation (partner effect from father to mother). (2) marital satisfaction influenced coparenting conflict negatively for both parents (actor effect). (3) marital satisfaction influenced coparenting triangulation negatively for both parents (actor effect). Also, father's marital satisfaction had a negative effect on mother's coparenting triangulation (partner effect from father to mother). Finding actor and partner effect on these associations was consistent with both Family System Theory (Minuchin, 1988) and previous works. Clinical implications were discussed.Ortak ebeveynlik, ebeveynlerin çocuk yetiştirme konusunda nasıl etkileşimde olduklarını içeren yönetsel bir ilişki türüdür. Ortak ebeveynlik, aile sistemi içerisinde çocuk ve ebeveyn özellikleri, ebeveyn ve çocuk uyum problemleri ve evlilik ilişkisi gibi bir çok kavram ile ilişkilidir. Kaliteli bir ortak ebeveynlik ilişkisi için en önemli parçalardan biri çift düzeyinde anne baba arasındaki ikili ilişkidir (Kitzmann, 2000). Dolayısıyla evlilik ilişkisi ile ortak ebeveynlik arasındaki bağlantıyı araştırmak önemlidir. Mevcut araştırmalar evlilik ilişkisi ve ortak ebeveynlik ilişkisi arasında bağlantı olduğunu göstermesine ragmen, bu kavramların birbirinden farklı olduğu vurgulanmıştır. Aile sistemleri teorisine (Minuchin, 1985; Minuchin, 1974) göre, ortak ebeveynlik yönetsel bir alt sistemdir ve evlilik ilişkisi alt sistemi ile birbirine bağlıdırlar. Tüm bu bilgilere ragmen, Türk ailelerinde evlilik ilişkisi ve ortak ebeveynlik arasındaki ilişkiye dair çok az şey bilinmektedir. Buradan yola çıkarak, bu araştırmanın amacı okul öncesi çağda çocuğu olan Türkiye'deki ailelerde evlilik memnuniyetinin ortak ebeveynlik ilişkisine etkisini çift perspektifi ile araştırmaktır. Araştırmanın örneklemini 3 ve 7 yaş arasında (M =56.96, SD =15.16) çocuk sahibi olan 249 evli çift (249 anne, 249 baba) oluşturmaktadır. Hem anne hem de babalar evlilik memnuniyetlerini ve 3 boyutlu (iş birliği, çatışma, üçgenleşme) ortak ebeveynlik ilişkilerini değerlendirmişlerdir. Üç farklı Aktör Partner Karşılıklı Bağımlılık Modeli (APKM) yürütülerek eşler arasındaki karşılıklı bağlılık ve olası aktör ve partner etkiler test edilmiştir (Cook & Kenny, 2005). Aktör Partner Karşılıklı Bağımlılık Modeli (APKM) sonuçlarına göre (1) her iki ebeveyn için evlilik memnuniyeti ortak ebeveynliğin iş birliği boyutunu olumlu yönde etkilemektedir (aktör etkisi). Buna ek olarak, babaların evlilik memnuniyetinin annelerin ortak ebeveynliklerinin iş birliği boyutu üzerinde olumlu etkisi vardır (partner etkisi) (2) her iki ebeveyn için evlilik memnuniyeti ortak ebeveynliğin çatışma boyutunu olumsuz yönde etkilemektedir (aktör etkisi) (3) her iki ebeveyn için evlilik memnuniyeti ortak ebeveynliğin üçgenleşme boyutunu olumsuz yönde etkilemektedir (aktör etkisi). Buna ek olarak, babaların evlilik memnuniyetinin annelerin ortak ebeveynliklerinin üçgenleşme boyutu üzerinde olumsuz etkisi vardır (partner etkisi)
Probing charm quark dynamics via multiparticle correlations in Pb-Pb collisions at √s NN = 5.02 TeV
No full textMultiparticle azimuthal correlations of prompt D0 mesons are measured in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of sNN=5.02 TeV. For the first time, a four-particle cumulant method is used to extract the second Fourier coefficient of the azimuthal distribution (v2) of D0 mesons as a function of event centrality and the D0 transverse momentum. The ratios of the four-particle v2 values to previously measured two-particle cumulant results provide direct experimental access to event-by-event fluctuations of charm quark azimuthal anisotropies. These ratios are also found to be comparable to those of inclusive charged particles in the event. However, hints of deviations are seen in the most central and peripheral collisions. To investigate the origin of flow fluctuations in the charm sector, these measurements are compared to a model implementing fluctuations of charm quark energy loss via collisional or radiative processes in the quark-gluon plasma. These models cannot quantitatively describe the data over the full transverse momentum and centrality ranges, although the calculations with collisional energy loss provide a better description of the data.BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).Publisher versio
Hybrid CPU-GPU acceleration of a multithreaded image stitching algorithm
No full textReal-time image stitching is critical, especially in un-manned aerial vehicles, and its acceleration has received attention in recent years. This paper describes an image stitching acceleration scheme for heterogeneous (CPU+GPU) devices. Acceleration is attempted with both multithreading and multiprocessing. Most time-critical functions in the algorithm are offloaded on to the GPU. We crafted a 3-buffer ping-pong mechanism for synchro-nization and data transfer among threads/processes in order to maximize CPU utilization. We carried out our experiments on Nvidia Jetson AGX Xavier. Results show that more than 3x acceleration is achieved.TÜBİTA