5916 research outputs found
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Coordinated beamforming design for multi-user multi-cell MIMO VLC networks
No full textInter-cell interference (ICI) and inter-user interference (IUI) constitute a major issue towards achieving the optimum spectral efficiency (SE) and energy efficiency (EE) performance in multi-cell visible light communication (VLC) networks. Hence, advanced multiple access techniques need to be leveraged in order to improve the provided service to the users of such interfering networks. To this end, the present contribution proposes the integration of coordinated beamforming (CB) with rate-splitting multiple access (RSMA) in multi-cell VLC systems. Specifically, we consider the design of beamformers for the common and private streams in a coordinated manner between different attocells, which is shown to provide efficient mitigation of the incurred interference. Additionally, the formulated optimization problem aims to minimize the sum of the mean squared error across all attocells in order to jointly determine the optimum receive filters and coordinated transmit beamformers for RSMA streams. In this context, we illustrate through extensive computer simulations, which are carried out in a realistic setup that assumes noisy channel state information acquisition, the distinct flexibility and robustness of CB-based RSMA in mitigating the incurred interference. Finally, the offered results demonstrate the superiority of CB-based RSMA in terms of achievable SE and EE performance in multi-cell VLC networks compared to the conventional CB-based space division multiple access counterpart.Publisher versio
Erratum to: Searches for long-lived charged particles in pp collisions at s√ = 7 and 8 TeV
No full textN/APublisher versio
Hashgraph consensus algoritması kullanarak IOT cihazının sınıflandırılması için dağıtık karalisteleme protokolü
No full textIndustrial applications require highly reliable, secure, low-power and low-delay communications. However, wireless communication links in the industrial environment suffer from various channel impairments which can compromise these requirements. This thesis presents a new reliable blacklisting protocol for ensuring the Internet of Things (IoT) network security and mitigating the effects of interference caused by multipath Rayleigh fading using a distributed approach. The proposed blacklisting protocol is simulated over a distributed IoT network setup where flat Rayleigh fading disrupts Message Queuing Telemetry Transport (MQTT) communications. Distributed servers jointly decide in real-time whether to blacklist a device after individually performing anomaly detection and submitting their results to the hashgraph network. The IoT devices are classified by a device fingerprinting method using various machine learning (ML) algorithms that are trained with real-time packet capture data. The proposed blacklisting protocol is shown to increase the accuracy of blacklisting malignant devices from 42% to 82% as the number of servers increases from one to five for mixed attacks. It also achieves higher accuracies ranging between 47.2%-97.6% versus 47.4%-90.7% compared to the related work for Denial of Service (DoS) attacks. For this simulation with multiple servers, a novel solution for reducing the PER in a Rayleigh fading environment by searching optimal distributed server locations with a hybrid approach is also provided. The proposed protocol and the server location optimization algorithm are particularly suitable for the Industrial IoT (IIoT) in mitigating the effects of harsh communication environments in manufacturing facilities.Endüstriyel uygulamalar son derece güvenilir, güvenli, düşük güçte ve düşük gecikmeli iletişim gerektirmektedir. Ancak, endüstriyel uygulamaların bulunduğu ortamlarda kablosuz iletişim bağlantıları, bu gereksinimleri tehlikeye atabilecek çeşitli engellerle karşı karşıyadır. Bu tezde, Nesnelerin İnternetinde (IoT) ağ güvenliğini sağlayarak ve dağıtık sunucular kullanarak Rayleigh sönümlemesinin etkilerini azaltmak için yeni bir güvenilir kara listeleme protokolü bulunmaktadır. Önerilen kara listeleme protokolü, Flat Rayleigh sönümlemesini Message Queuing Telemetry Transport (MQTT) iletişimini engellediği dağıtık IoT ağı üzerinde simüle edilmektedir. Sunucular, anormallik tespiti gerçekleştirip sonuçlarını hashgraph ağına gönderdikten sonra, cihazların kara listeye alınmasına gerçek zamanlı olarak ortaklaşa karar verir. IoT cihazları, gerçek zamanlı pcap verileriyle eğitilmiş çeşitli makine öğrenmesi algoritmaları ile sınıflandırılır. Önerilen kara listeme protokolünün, çeşitli saldırılar için sunucu sayısı birden beşe çıkarken, cihazları kara listeye alma doğruluğunu %42'den %82'ye çıkardığı gösterilmiştir. Ayrıca, DoS saldırıları için ilgili çalışmaya kıyasla sunucu sayısına göre %47,2-%97.6 arasında değişen başarımlarla, ilgili çalışmadan (%47.4-%90.7) daha yüksek başarımlar elde etmektedir. Çoklu sunuculu bu simülasyon için, bir Rayleigh sönümleme ortamında optimal dağıtık sunucu konumlarını hibrit bir algoritma ile arayarak paket hata oranını azaltmak için yeni bir çözüm de sağlanmıştır. Önerilen protokol ve sunucu konumu optimizasyon algoritması, özellikle endüstriyel tesislerinin sönümlemeli iletişim ortamlarının etkilerini azaltmak için uygundur
The use of parametric mapping as an analysis method in contextual design studio
No full textThis paper is discussed an experimental study carried out in the
undergraduate Contextual Design Studio (CDS). The studio comprises four stages: Site
Analysis Phase, Conceptual Design Studies, Design Development Phase, and Final
Presentation. The site analysis stage lasts for about four weeks,10 hours a week in the
studio. Particular importance is given to this part of the project so that students have a
chance to gain different perspectives on multiple meanings of context and, more
specifically, the historical, social and physical context of the the neighborhood. Besides
conventional mapping and representation techniques and tools, some new design tools
have been introduced in the studio, one of which was this experimental study in question.
The study aims at the integration of the Parametric Mapping techniques, at a basic level,
into the site analysis process in the contextual design studio to provide an entry point to
thinking through the tool used for the students. In this term, the method of abstracting
site features through Parametric Mapping was used in the site analysis process and the
effect of this form-oriented data on the concepts of the projects was interpreted.
NudiBranch, an add-on to the Grasshopper program, was used in the Parametric
Mapping workshop. Students' works were discussed briefly with the help of some
representative instances
Composite cold-formed steel rubberised concrete building framed systems
No full textIn this research, with the use of cold-formed steel (CFS) sections in-filled with rubberized concrete (RuC), a new low-carbon construction system is developed and assessed for its structural resilience and environmental impact compared to the current conventional earthquake-proof construction. First, connection level moment-rotation responses of the new form of CFS-RuC framed structure are validated against the results obtained from detailed finite element analyses. Next, nonlinear pushover analyses are undertaken on the CFS-RuC framed system in conjunction with conventional hot-rolled steel and reinforced-concrete (RC) frames for a case study selected in Istanbul. Lastly, economic and environmental impact analyses are conducted on the frame systems. The results show that the new CFS-RuC composite system offers both structural and environmental advantages compared to conventional systems. In terms of seismic performance of multi-storey buildings, it is shown that the ductility capacity of the CFS-RuC system can be improved by increasing the number of stories.Royal Academy of Engineerin
A variable neighborhood search based matheuristic for a waste cooking oil collection network design problem
No full textHouseholds produce large amounts of waste cooking oil (WCO), which should be disposed properly to avoid its negative impacts on the environment. Using WCO as raw material in biodiesel production is an effective disposal method. In this study, we focus on designing an efficient WCO collection network, in which households deposit their WCO into the bins to be placed at several collection centers (CCs), which are then regularly collected by capacitated vehicles. We study the problem of determining (i) the number and location of the CCs, (ii) the assignment of households to the CCs, respecting a certain coverage distance threshold, (iii) the number of bins to place at each CC, and (iv) the vehicle routes navigating between the biodiesel facility and CCs to minimize the sum of fixed cost of opening CCs and placing bins at each CC and routing cost. To solve the proposed location-routing problem, we develop a novel matheuristic based on Variable Neighborhood Search, which incorporates an integer programming model to determine the bin allocation and assignment decisions. We evaluate the solution performance of different variants of the proposed algorithm by performing an extensive computational study on a set of hypothetical and case instances. The results show that the proposed matheuristic provides superior solutions with respect to benchmark algorithms.DIP program for German–Israeli Cooperation ; Helen and Martin Kimmel Center for Molecular Design ; Minerva Foundation ; Israel Science Foundatio
Making property of a marsh: environment, property, and politics in nineteenth-century Ottoman Ioannina
No full textThis article discusses the contested character of property rights with respect to reclaimed land from marshes in the Ottoman Empire through the reclamation project for Lake Lapsista in Ottoman Ioannina starting from 1886. By the end of the nineteenth century, many marshes, lakes, and rivers in the Ottoman territories were planned to be cleaned and reclaimed for various purposes. However, as a result of reclamation projects, the possession of reclaimed land, and the way such lands were defined, became a vexed issue in which various actors became involved and struggled over controlling them. Focusing on struggles and negotiations the reclamation project created, the article aims to uncover how the ownership of reclaimed marshy regions were defined at the local level. Drawing on archival materials on the land dispute over the reclaimed Lake Lapsista from 1886 to 1909, the article shows that the struggle over control of the reclaimed land manifested itself in the attempts of both central and local actors to circumvent legal boundaries or manipulate legal regulation and codes at the local level, challenging approaches that only focus on legal texts and codes. © 2021 Informa UK Limited, trading as Taylor & Francis Group
Olasılık ve istatistik temelli simülasyon ile elektrikli araç şarj istasyonlarının elektriksel ve finansal analizi
No full textIncreasing environmental pollution with the increase of vehicles that have internal combustion engines has led people to alternative methods due to the transportation sector's share in environmental pollution. Last decade, Researches have been increasıng sharply in this field to improve E-Mobility usage. On the other hand, automobile manufacturers who are producing internal combustion engines have announced that they will stop their R&D studies as of 2025. It is predicted that 300-350 million electric vehicles will be in traffic in the world by 2040. It is estimated that the energy demand created by this number of electric vehicles can be met with 350 million electric vehicle charging stations. In Turkey, it is estimated that 10 million electric vehicles will be on the roads in 2040. New charging stations will be established to meet the demand for electric vehicle charging stations that arise with the increase in electric vehicles. However, due to the lack of historical data, it is not entirely known how these stations will affect the electrification system in the region where they are installed in public areas. On the other hand, the number of stations does not increase rapidly due to the lack of a comparative example for investors who want to establish an electric vehicle charging station. In order to solve this problem, a simulation was created based on probabilistic and statistical analysis. As a result of the simulation, a realistic data set was created, and the effect of the new electric vehicle charging stations was discussed electrically and financially. There are two cases for using the simulation. One of the stations chosen for the simulation in the study is the shopping mall's car park, and another is a rest area on the Istanbul-Izmir highway.Dünyada fosil yakıtla çalışan motorlu araçların artışıyla birlikte yükselen çevre kirliliği, insanları alternatif yöntemlere sevk etmiştir. Ulaşım sektörünün çevre kirliliğindeki payı dolayısıyla elektrikli araçların kullanılması iyi bir yöntem olarak görülmektedir. Son on yılda elektrikli araç sayısının yükselişi bu yöndeki çalışmaları hızlandırmıştır. Diğer bir yandan içten yanmalı motor kullanan otomobil üreticileri 2025 yılından itibaren AR-GE çalışmalarını durduracağını açıklamışlardır. Dünyada 300-350 milyon elektrikli aracın 2040 senesinden itibaren trafikte yer alması öngörülmektedir. Bu sayıdaki elektrikli aracın oluşturacağı enerji ihtiyacı talebinin 350 milyon elektrikli araç şarj istasyonuyla birlikte karşılanabileceği tahmin edilmektedir. Türkiye'de ise 10 milyon elektrikli aracın 2040 senesinde yollarda olacağı tahmin edilmektedir. Elektrikli araçların artışıyla birlikte ortaya çıkan elektrikli araç şarj istasyonu talebini karşılayabilmek için yeni şarj istasyonları kurulacaktır. Bu istasyonların halka açık alanlara kurulumu sırasında kurulduğu bölgedeki elektrifikasyon sistemine nasıl bir etki yapacağı geçmişe dönük veri eksikliğinden dolayı tamamıyla bilinememektedir. Diğer bir yandan elektrikli araç şarj istasyonu kurmak isteyen yatırımcıların karşılaştırabildiği bir örnek olmamasından dolayı istasyon sayısı hızla artmamaktadır. Bu soruna çözüm olmak amacıyla olasılıksal temellere dayanılarak bir simülasyon oluşturulmuştur. Simülasyon sonucunda gerçeğe yakın bir veri seti oluşturarak, yeni kurulacak elektrikli araç şarj istasyonlarının yaratacağı etki elektriksel ve finansal açıdan ele alınmıştır. Çalışmada simülasyon için seçilen istasyonların biri şehir içinde sık ziyaret edilen alışveriş merkezinin otoparkı, diğeri ise İstanbul-İzmir otoyolu üzerinde bulunan bir benzin istasyonudur
Identification of hadronic tau lepton decays using a deep neural network
No full textA new algorithm is presented to discriminate reconstructed hadronic decays of tau leptons (τ h) that originate from genuine tau leptons in the CMS detector against τ h candidates that originate from quark or gluon jets, electrons, or muons. The algorithm inputs information from all reconstructed particles in the vicinity of a τ h candidate and employs a deep neural network with convolutional layers to efficiently process the inputs. This algorithm leads to a significantly improved performance compared with the previously used one. For example, the efficiency for a genuine τ h to pass the discriminator against jets increases by 10-30% for a given efficiency for quark and gluon jets. Furthermore, a more efficient τ h reconstruction is introduced that incorporates additional hadronic decay modes. The superior performance of the new algorithm to discriminate against jets, electrons, and muons and the improved τ h reconstruction method are validated with LHC proton-proton collision data at s = 13 TeV.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 (U.K.) ; DOE and NSF (U.S.A.) .
Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 724704, 752730, 758316, 765710, 824093, 884104, and COST Action 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 Science - EOS" - be.h project n. 30820817; the Being 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 number 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 123842, 123959, 124845, 124850, 125105, 128713, 128786, and 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 CEECIND/01334/2018 (Portugal); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, projects no. 0723-2020-0041 and no. FSWW-2020-0008, and the Russian Foundation for Basic Research, project No. 19-42-703014 (Russia); MCIN/AEI/10.13039/501100011033, ERDF "a way of making Europe", and the Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu, grant 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 C-1845; and the Weston Havens Foundation (U.S.A.).Publisher versio
Cultivating membership abroad: Analyzing German pre-integration courses for Turkish marriage migrants
No full textAddressing research on migration governance, this article examines German pre-integration courses offered to Turkish marriage migrants in Istanbul. The courses were implemented in response to growing concern about the perceived poor integration of Muslim migrants and a high number of forced marriages. I argue that these courses are a micro form of biopolitical governance. Specifically, they are an attempt to generate internalized ways of being and knowing that are desired by the state, which I call 'membership cultivation.' As such, the courses are not precisely aimed at restricting migration as in other pre-integration measures, nor are they mainly reinforcing symbolic boundaries and teaching liberalism as in post-migration German civic integration courses. Rather, the courses attempt to re-make migrants with regards to morality, culture and gender. Using participant observation and in-depth interviews, this research examines the disciplinary mechanisms targeting migrants' transformation to enhance our understanding of the biopolitics of pre-integration governance