kth.sePublications
Change search
Refine search result
19202122 1051 - 1069 of 1069
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1051. Zhang, Z.
    et al.
    Zhang, J.
    Wu, B.
    Li, X.
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
    Chen, Y.
    Huang, J.
    Zhu, L.
    Tian, H.
    Diarylethenes with a Narrow Singlet–Triplet Energy Gap Sensitizer: a Simple Strategy for Efficient Visible-Light Photochromism2018In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 6, no 6, article id 1700847Article in journal (Refereed)
    Abstract [en]

    All-organic visible-light photochromism is reported here via a novel strategy with narrow singlet–triplet energy gap (ΔEST) materials as a sensitizer. Taking advantage of the narrow ΔEST feature and the triplet–triplet energy transfer process, highly efficient photochromism of diarylethenes (DAEs) with both ring-open and ring-closure excitations shifted to visible light region is successfully achieved. Moreover, the wavelength of the visible excitation light can be easily modulated (e.g., from 405 to 470 nm) by elaborate selection of matched sensitized molecules. The “write-and-erase” application of this photochromic system in polymer films is further demonstrated. This strategy provides a simple and versatile selection of well-matched DAE/sensitizer couples for visible-light photochromism without complicated molecular design.

  • 1052.
    Zhang, Zhao
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Sez Trieste, SISSA, via Bonomea 265, I-34136 Trieste, Italy.;Sez Trieste, INFN, via Bonomea 265, I-34136 Trieste, Italy.;Stockholm Univ, Hannes Alfvens vag 12, SE-10691 Stockholm, Sweden..
    Schou Røising, Henrik
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Hannes Alfvens vag 12, SE-10691 Stockholm, Sweden.;Univ Copenhagen, Niels Bohr Inst, Jagtvej 155A, DK-2200 Copenhagen, Denmark..
    The frustration-free fully packed loop model2023In: Journal of Physics A: Mathematical and Theoretical, ISSN 1751-8113, E-ISSN 1751-8121, Vol. 56, no 19, article id 194001Article in journal (Refereed)
    Abstract [en]

    We consider a quantum fully packed loop model on the square lattice with a frustration-free projector Hamiltonian and ring-exchange interactions acting on plaquettes. A boundary Hamiltonian is added to favor domain-wall boundary conditions and link ground state properties to the combinatorics and six-vertex model literature. We discuss how the boundary term fractures the Hilbert space into Krylov subspaces, and we prove that the Hamiltonian is ergodic within each subspace, leading to a series of energy-equidistant exact eigenstates in the lower end of the spectrum. Among them we systematically classify both finitely entangled eigenstates and product eigenstates. Using a recursion relation for enumerating half-plane configurations, we compute numerically the exact entanglement entropy of the ground state, confirming area law scaling. Finally, the spectrum is shown to be gapless in the thermodynamic limit with a trial state constructed by adding a twist to the ground state superposition.

  • 1053.
    Zhao, Fangzhou
    et al.
    Aalborg Univ, AAU Energy, DK-9220 Aalborg, Denmark..
    Zhu, Tianhua
    Aalborg Univ, AAU Energy, DK-9220 Aalborg, Denmark..
    Harnefors, Lennart
    ABB Corp Res, Västerås SE-72226, Sweden..
    Fan, Bo
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering.
    Wu, Heng
    Zhou, Zichao
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Sun, Yin
    Shell Global Solut Int BV, Renewable Generat Technol, NL-2596 The Hague, Netherlands..
    Wang, Xiongfei
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Closed-Form Solutions for Grid-Forming Converters: A Design-Oriented Study2024In: IEEE OPEN JOURNAL OF POWER ELECTRONICS, ISSN 2644-1314, Vol. 5, p. 186-200Article in journal (Refereed)
    Abstract [en]

    This paper derives closed-form solutions for grid-forming converters with power synchronization control (PSC) by subtly simplifying and factorizing the complex closed-loop models. The solutions can offer clear analytical insights into control-loop interactions, enabling guidelines for robust controller design. It is proved that 1) the proportional gains of PSC and alternating voltage control (AVC) can introduce negative resistance, which aggravates synchronous resonance (SR) of power control, 2) the integral gain of AVC is the cause of sub-synchronous resonance (SSR) in stiff-grid interconnections, albeit the proportional gain of AVC can help dampen the SSR, and 3) surprisingly, the current controller that dampens SR actually exacerbates SSR. Controller design guidelines are given based on analytical insights. The findings are verified by simulations and experimental results.

  • 1054. Zhao, J. -Y
    et al.
    Lu, Yezhe
    KTH.
    Sun, Y. -F
    Wang, Q. -Q
    Si, G. -D
    Wu, Y.
    Ding, L. -P
    Li, L.
    Effect of sn on microstructure and mechanical properties of vermicular graphite iron2013In: Zhuzao/Foundry, ISSN 1001-4977, Vol. 62, no 10, p. 948-952Article in journal (Refereed)
    Abstract [en]

    Effect of Sn on microstructure and mechanical properties of vermicular graphite iron (VGI) was investigated by testing with OM, SEM, EDS and tensile properties experiments. The results show that Sn abates the amount of vermicular graphite and refines them. Pearlite is promoted and refined by addition of Sn. With addition of 0.057% Sn, pearlite accounts for more than 95% and the lamellar spacing apparently narrows to troostite level (83 nm). Appropriate addition of Sn helps to strengthen the VGI and samples containing 0.057% Sn performs the best tensile strength of 410.7 MPa and a decent elongation of 1.23%. However, excessive Sn (more than 0.121%) promotes the generation of free cementite, which fatally decrease the strength and ductility of VGI.

  • 1055. Zhao, W.L.
    et al.
    Yang, S.Y.
    Wang, J.
    Xiao, J.M.
    Lu, Xiaoxia
    KTH, School of Industrial Engineering and Management (ITM). College of Oceanography and Earth Science, Xiamen University, Xiamen, China.
    Lin, J.
    Huang, P.
    Cai, M.G.
    Load estimation and assessment of land-based pollution for Quanzhou Bay and their relevance to the Total Quantity Control of Pollutants Discharged into the Sea (TQCPS) Program in China2015In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 166, no Part B, p. 230-239Article in journal (Refereed)
    Abstract [en]

    The Total Quantity Control of Pollutants Discharged into the Sea (TQCPS) Program belonged to the Public Science and Technology Research Funds Projects of Ocean in China, launched in 2008. As one of the most important and typical demonstration cases of the TQCPS Program, a full investigation of the land-based pollutions discharges around Quanzhou Bay, China developed the total input for three main environmental factors (NH<inf>3</inf>-N, TP, COD) which were estimated and quantified in 2008 and 2012, respectively. Combined with the trend of seawater quality changes in Quanzhou Bay in the same periods, the effects of the program’s implementation were then evaluated. On the whole, by using the basic survey data and export coefficient method, the total amounts of NH<inf>3</inf>-N, TP and COD discharged into the bay were estimated to be approximately 888.3, 130.6 and 14527.4t/a in 2008, and 1518.6, 558.8 and 19986.7t/a in 2012, respectively, where the percentage of the discharge from domestic sources (46.5% in 2008 and 45.2% in 2012) was generally higher than that from the other sources. Based on the characteristic of geography and administrative division, the land areas around the bay were divided into three parts: the south coast region (SCR), the west coast region (WCR), and the north coast region (NCR). The SCR and WCR accounted for 59.2 and 35.4% of the COD loads, and 49.2 and 48.0% of NH<inf>3</inf>-N loads in 2008. The NCR contributed less of the industrial pollution, but most to domestic pollution (54.1%), followed by 26.2% in the SCR in 2012. The contributions of the discharge from different land areas to the pollution of Quanzhou Bay were found to be differed in 2008 and 2012. Due to the difference in the levels of the economic development among these three areas, the discharge of pollutants from the north coast was much lower than that from the other two parts in 2008; however, following our suggestion of the moderation and optimization of the industrial distribution and the sewage discharge around Quanzhou Bay, the contribution of the west coast decreased while that of the north coast increased significantly in 2012. Furthermore, to a great extent, because of some marine ecological rehabilitation projects, which were also suggested by our TQCPS Program and finally adopted by local government and then developed recently in Quanzhou Bay, the seawater qualities there were improved by in 2012. A longer time and greater efforts are needed to reduce the discharge of land-based pollutants and to improve the marine ecological health and sustainability further. Based on the demonstration results of the research and practice of the TQCPS Program in Quanzhou Bay, some recommendations were suggested. These require further implementation and management and can be transferred to similar estuaries and bays in southeastern coastal areas of China.

  • 1056.
    Zhao, Ziyi
    et al.
    Ecole Polytech Fed Lausanne, CVLab, Lausanne, Switzerland..
    Kiciroglu, Sena
    Ecole Polytech Fed Lausanne, CVLab, Lausanne, Switzerland.;Tongji Univ, Lausanne, Switzerland..
    Vinzant, Hugues
    A gO, Corps Nuds, France..
    Cheng, Yuan
    KTH.
    Katircioglu, Isinsu
    SDSC, Lausanne, Switzerland..
    Salzmann, Mathieu
    Ecole Polytech Fed Lausanne, CVLab, Lausanne, Switzerland.;Clearspace, Lausanne, Switzerland..
    Fua, Pascal
    Ecole Polytech Fed Lausanne, CVLab, Lausanne, Switzerland..
    3D Pose Based Feedback for Physical Exercises2023In: ACCV 2022: Computer Vision / [ed] Wang, L Gall, J Chin, TJ Sato, I Chellappa, R, Springer Nature , 2023, Vol. 13844, p. 189-205Conference paper (Refereed)
    Abstract [en]

    Unsupervised self-rehabilitation exercises and physical training can cause serious injuries if performed incorrectly. We introduce a learning-based framework that identifies the mistakes made by a user and proposes corrective measures for easier and safer individual training. Our framework does not rely on hard-coded, heuristic rules. Instead, it learns them from data, which facilitates its adaptation to specific user needs. To this end, we use a Graph Convolutional Network (GCN) architecture acting on the user's pose sequence to model the relationship between the body joints trajectories. To evaluate our approach, we introduce a dataset with 3 different physical exercises. Our approach yields 90.9% mistake identification accuracy and successfully corrects 94.2% of the mistakes. Our code and dataset are available at https://github.com/Jacoo-Zhao/3D-Pose-Based-Feedback-For-Physical-Exercises.

  • 1057. Zheng, S. -F
    et al.
    Wang, Weixing
    KTH. College of Physics and Information Engineering, Fuzhou University, Fuzhou, 350116, China; School of Information Engineering, Chang'an University, Xi'an, 710064, China.
    Wu, Y. -C
    Synchronous motion de-aliasing based on optical flow topological sparse weighting2019In: Guangxue Jingmi Gongcheng/Optics and Precision Engineering, ISSN 1004-924X, Vol. 27, no 5, p. 1188-1195Article in journal (Refereed)
    Abstract [en]

    This work aims to overcome the limitations of Euclidean distance weighted sparse subspace clustering that does not consider the manifold structure of a rigid body. Here, a sparse subspace clustering method weighted using optical flow trajectory manifold topology was proposed. In the proposed algorithm, the manifold distance of each trajectory in the space-time similarity adjacency matrix was embedded into the weight matrix to solve the sparse coefficient. This ensured that the trajectory with a relatively closed manifold distance became the sparse self-expression dictionary, thereby reducing the clustering aliasing error of synchronous motion. The comparison of experiments between synchronous motion and synchronous swing reveals that the proposed algorithm can reduce aliasing error down to 1%. Finally, the motion segmentation results of Jacquard needle indicate that the algorithm can be potentially used for industrial applications.

  • 1058.
    Zhivkov, Olexander
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Micro and Nanosystems.
    Stoianov, Illia
    Institute of Telecommunication Systems National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
    Tychynskyi-Martyniuk, Vitalii
    Institute of Telecommunication Systems National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
    Galitskiy, Illia
    Institute of Telecommunication Systems National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
    Shevtsov, Kostiantyn
    Institute of Telecommunication Systems National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
    Kamarali, Roman
    Institute of Telecommunication Systems National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine.
    Modeling of Microwave and Terahertz Trapped Modes by Circuit Theory Methods2023In: 2023 IEEE 6th International Conference on Information and Telecommunication Technologies and Radio Electronics, UkrMiCo 2023, Institute of Electrical and Electronics Engineers (IEEE) , 2023Conference paper (Refereed)
    Abstract [en]

    The concept of 'trapped mode' appeared in acoustics, after it was extended to electrodynamics. The number of publications increased sharply after the appearance of metamaterials. We aim to create a simple electrodynamic model of the trapped mode suitable for use in the microwave and THz frequency ranges.

  • 1059.
    Zhou, Chao
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
    Shatskiy, Andrey
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
    Temerdashev, Azamat Z.
    Kuban State Univ, Dept Analyt Chem, Stavropolskaya St 149, Krasnodar 350040, Russia..
    Kärkäs, Markus D.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
    Dinér, Peter
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
    Highly congested spiro-compounds via photoredox-mediated dearomative annulation cascade2022In: Communications Chemistry, E-ISSN 2399-3669, Vol. 5, no 1, article id 92Article in journal (Refereed)
    Abstract [en]

    Photo-mediated radical dearomatization involving 5-exo-trig cyclizations has proven to be an important route to accessing spirocyclic compounds, whereas 6-exo-trig spirocyclization has been much less explored. In this work, a dearomative annulation cascade is realized through photoredox-mediated C-O bond activation of aromatic carboxylic acids to produce two kinds of spirocyclic frameworks. Mechanistically, the acyl radical is formed through oxidation of triphenylphosphine and subsequent C-O bond cleavage, followed by a 6-exo-trig cyclization/SET/protonation sequence to generate the spiro-chromanone products in an intramolecular manner. Furthermore, the protocol was extended to more challenging intermolecular tandem sequences consisting of C-O bond cleavage, radical addition to an alkene substrate, and 5-exo-trig cyclization to yield complex spirocyclic lactams. Photo-mediated radical dearomatization involving 5-exo-trig cyclizations has proven to be an important route to accessing spirocyclic compounds, whereas 6-exo-trig spirocyclization has been much less explored. Here, a dearomative annulation cascade is realized through a photoredox-mediated C-O bond activation of aromatic carboxylic acids to produce two kinds of spirocyclic frameworks, whereby the spirocyclizations are triggered by acyl radical formation from benzoic acids leading to spiro-chromanones via a direct intramolecular 6-exo-trig cyclization or spirocyclic lactams via an intermolecular addition/5-exo-trig cyclization cascade.

  • 1060.
    Zhou, Mi
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Department of Chemistry & Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
    Mattsson, Tuve
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Department of Chemistry & Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
    Effect of crossflow regime on the deposit and cohesive strength of membrane surface fouling layers2019In: Food and Bioproducts Processing, ISSN 0960-3085, E-ISSN 1744-3571, Vol. 115, p. 185-193Article in journal (Refereed)
    Abstract [en]

    Acquiring knowledge of the properties of membrane fouling layers is crucial to mitigating fouling and developing cleaning strategies. The cohesive strength of these fouling layers, which determines the cleaning requirement of the membrane, is nevertheless rarely investigated. Here we introduced fluid dynamic gauging (FDG)to the crossflow microfiltration of a wood material, namely microcrystalline cellulose (MCC, nominal particle size 20 μm, 95% (in volume)of the particles are bigger than 5.4 μm and smaller than 56.4 μm), to study in situ the cohesive strength of the membrane surface fouling formed under different crossflow regimes. Using regenerated cellulose membrane with a nominal pore size of 0.2 μm, filtration experiments with FDG measurement show that the crossflow regime can lead to the formation of surface fouling layers with distinct cohesive strength. Fouling formed in turbulent/transitional crossflow (Reynolds number, Re duct = 4170)was stronger and its removal required more liquid shear stress compared to the layers formed in laminar crossflow (Re duct = 1560). The fouling layers that can withstand the minimum shear of 35 Pa from the FDG sensor with turbulent/transitional crossflow were, on average 294 ± 10 μm thick, in contrast to those formed in laminar crossflow, which were significantly thinner (144 ± 73 μm at 35 Pa shear stress, p &lt; 0.05). On the other hand, turbulent/transitional crossflow reduced material deposition significantly (p &lt; 0.05). After 1000 s filtration, 0.117 ± 0.003 kg m −2 MCC were found on the turbulent/transitional crossflow membranes, compare to 0.134 ± 0.005 kg m −2 in the laminar crossflow situation. Moreover, a similar permeate flux was observed in all experiments. Therefore, this work also highlights the necessity of developing membrane cleaning protocols based on the fouling layer properties, rather than on the permeate flux decline.

  • 1061. Zhou, X. P.
    et al.
    Soares, F. M.
    Fontaine, N. K.
    Baek, J. H.
    Cheung, S.
    Shearn, M.
    Scherer, A.
    Olsson, Fredrik
    School of Information and Communication Technology, Royal Institute of Technology, S-16440 Stockholm, Sweden.
    Lourdudoss, Sebastian
    KTH, School of Information and Communication Technology (ICT).
    Liu, K. Y.
    Tsang, W. T.
    Yoo, S. J. B.
    16-channel × 100-GHz monolithically integrated O-CDMA transmitter with SPECTS encoder and seven 10-GHz mode-locked lasers2010In: Optics InfoBase Conference Papers, OSA Publishing , 2010Conference paper (Refereed)
    Abstract [en]

    We demonstrate a fully-integrated O-CDMA transmitter by monolithically integrating 7 collidingpulse mode-locked lasers with two arrayed waveguide gratings and 16 phase modulators in InP technology.

  • 1062.
    Zhou, Xiamo
    et al.
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Carlborg, Carl Fredrik
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Sandström, Niklas
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Haleem, A.
    KTH.
    Vastesson, Alexander
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Saharil, Farizah
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    van der Wijngaart, Wouter
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Rapid Fabrication Of OSTE+ Microfluidic Devices With Lithographically Defined Hydrophobic/ Hydrophilic Patterns And Biocompatible Chip Sealing2013In: 17th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2013, Freiburg, Germany: NO , 2013, p. 134-136Conference paper (Refereed)
    Abstract [en]

    Here we present an uncomplicated and robust method for rapid prototyping of microfluidic devices featuring: 1) lithographically defined, permanently surface modified hydrophilic and hydrophobic regions with contact angles varying from 18o to 118o, in which all four channel walls are surface modified in a single step using polymer chain grafting; 2) polymer chains grafted from open surfaces before bonding, making this method suitable for batch fabrication; 3) biomolecule-compatible, room temperature, dry, homogeneous chip-sealing, in which native as well as hydrophobic/hydrophilic modified OSTE+ surfaces allow for epoxy-epoxy and thiol-epoxy covalent bonding, hence greatly simplifying alignment and dramatically increasing device yields. We demonstrate the method with a functional microfluidic device. This represents a complete, simplified and robust method for batch-manufacturing compatible prototyping of microfluidic devices with tunable mechanical and surface properties. 

  • 1063.
    Zhu, Bin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Lund, Peter
    Raza, Rizwan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Patakangas, Janne
    Huang, Qiu-An
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Fan, Liangdong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Singh, Manish
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    A new energy conversion technology based on nano-redox and nano-device processes2013In: Nano Energy, ISSN 2211-2855, Vol. 2, no 6, p. 1179-1185Article in journal (Refereed)
    Abstract [en]

    Electrolyte-separator-free fuel cell (EFFC) is a new emerging energy conversion technology. The EFFC consists of a single-component of nanocomposite material which works as a one-layer fuel cell device contrary to the traditional three-layer anode-electrolyte-cathode structure, in which an electrolyte layer plays a critical role. The nanocomposite of a single homogenous layer consists of a mixture of semiconducting and ionic materials that provides the necessary electrochemical reaction sites and charge transport paths for a fuel cell. These can be accomplished through tailoring ionic and electronic (n, p) conductivities and catalyst activities, which enable redox reactions to occur on nano-particles and finally accomplish a fuel cell function.

  • 1064.
    Zhu, Jing
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab). Univ Sci & Technol China, Sch Informat Sci & Technol, Hefei, Anhui, Peoples R China..
    Natalino, Carlos
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Furdek, Marija
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Zhu, Zuqing
    Univ Sci & Technol China, Sch Informat Sci & Technol, Hefei, Anhui, Peoples R China..
    Control Plane Robustness in Software-Defined Optical Networks under Targeted Fiber Cuts2018In: 22ND INTERNATIONAL CONFERENCE ON OPTICAL NETWORK DESIGN AND MODELING (ONDM 2018) / [ed] Ruffini, M Tzanakaki, A Casellas, R Autenrieth, A MarquezBarja, JM, IEEE , 2018, p. 118-123Conference paper (Refereed)
    Abstract [en]

    The Software-Defined Optical Networking (SDON) paradigm enables programmable, adaptive and application-aware backbone networks. However, aside from the manifold advantages, the centralized Network Control and Management in SDONs also gives rise to a number of security concerns at different network layers. As communication between the control and the data plane devices in an SDON utilizes the common optical fiber infrastructure, it can be subject to various targeted attacks aimed at disabling the underlying optical network infrastructure and disrupting the services running in the network. In this work, we focus on the threats from targeted fiber cuts to the control plane (CP) robustness in an SDON under different link cut attack scenarios with diverse damaging potential, modeled through a newly defined link criticality measure based on the routing of control paths. To quantify the robustness of a particular CP realization, we propose a metric called Average Control Plane Connectivity (ACPC) and analyze the CP robustness for a varying number of controller instances in master/slave configuration. Simulation results indicate that CP enhancements in terms of controller addition do not necessarily yield linear improvements in CP robustness but require tailored CP design strategies.

  • 1065.
    Zhuang, Hao
    et al.
    KTH.
    Ntareme, Herve
    KTH.
    Ou, Z.
    Pehrson, Björn
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    A service adaptation middleware for delay tolerant network based on HTTP simple queue service2012In: 6th USENIX/ACM Workshop on Networked Systems for Developing Regions, NSDR 2012, USENIX Association , 2012Conference paper (Refereed)
    Abstract [en]

    An increasing number of web-based Delay Tolerant Network (DTN) applications are being developed by researchers, ranging from monitoring the environment to supplementing other network infrastructure located or installed in harsh environments like wireless sensor networks. These applications need to communicate with the DTN daemon to facilitate data transmission. Hence, it is necessary to provide a middleware layer that allows the communication between applications based on different platforms and DTN service daemons. In this paper, a DTN Service Adaptation Middleware (DSAM) is proposed to provide a communication layer between DTN service daemons and different applications based on different platforms (e.g., Java, Python, C/C++, PHP). Furthermore, we delineate the architecture of DSAM and describe two supporting applications based on our middleware, namely DTN2 network management tool and WSN environmental monitoring application. Finally, we present our findings grounded on performance evaluations in terms of throughput and power consumption.

  • 1066. Ziesmer, J.
    et al.
    Tajpara, P.
    Hempel, N. -J
    Ehrström, M.
    Melican, Keira
    KTH.
    Eidsmo, L.
    Sotiriou, G. A.
    Vancomycin-Loaded Microneedle Arrays against Methicillin-Resistant Staphylococcus Aureus Skin Infections2021In: Advanced Materials Technologies, E-ISSN 2365-709X, Vol. 6, no 7, p. 2001307-, article id 2001307Article in journal (Refereed)
    Abstract [en]

    Skin and soft tissue infections (SSTIs) caused by methicillin-resistant Staphylococcus aureus (MRSA) are a major healthcare burden, often treated with intravenous injection of the glycopeptide antibiotic vancomycin (VAN). However, low local drug concentration in the skin limits its treatment efficiency, while systemic exposure promotes the development of resistant bacterial strains. Topical administration of VAN on skin is ineffective as its high molecular weight prohibits transdermal penetration. In order to implement a local VAN delivery, microneedle (MN) arrays with a water-insoluble support layer for the controlled administration of VAN into the skin are developed. The utilization of such a support layer results in water-insoluble needle shafts surrounded by drug-loaded water-soluble tips with high drug encapsulation. The developed MN arrays can penetrate the dermal barriers of both porcine and fresh human skin. Permeation studies on porcine skin reveal that the majority of the delivered VAN is retained within the skin. It is shown that the VAN-MN array reduces MRSA growth both in vitro and ex vivo on skin. The developed VAN-MN arrays may be extended to several drugs and may facilitate localized treatment of MRSA-caused skin infections while minimizing adverse systemic effects.

  • 1067. Zurita, A.
    et al.
    Strand, Anna
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Guédez, Rafael
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Escobar, R. A.
    Identifying Optimum CSP plant Configurations for Spot Markets using a Dispatch Optimization Algorithm – A Case Study for Chile2020In: SOLARPACES 2019: International Conference on Concentrating Solar Power and Chemical Energy Systems, AIP Publishing , 2020, Vol. 2303, article id 0028964Conference paper (Refereed)
    Abstract [en]

    This work presents a dispatch optimizer algorithm that seeks to maximize the revenues of a CSP plant by selling electricity to the grid for a case study in Chile. The model comprehends a mixed-integer programming problem in which the operation and performance of the plant are represented by the physics and energy balances of the system. The analysis was applied using meteorological and electrical prices data of Crucero and Polpaico located in northern and central region of Chile, respectively, to couple a perfect forecast of weather and market conditions to the model. Results indicate that it is possible to determine best configurations for CSP plants in terms of solar field size and thermal storage under given electric prices conditions that result in better trade-offs between investment and profits of the plant. In this way, this work also demonstrates the importance of coupling optimized dispatch strategies with financial models, suggesting also that CSP developers could implement these type of optimizers with price forecasting models to evaluate the profitability and viability of their business models.

  • 1068.
    Örd, Teet
    et al.
    Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia..
    Rago, Ullike
    Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia..
    Vargunin, Artjom
    KTH, School of Engineering Sciences (SCI), Theoretical Physics. Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia.
    Litak, Grzegorz
    Lublin Univ Technol, Fac Mech Engn, Nadbystrzycka 36, PL-20618 Lublin, Poland.;AGH Univ Sci & Technol, Dept Proc Control, Mickiewicza 30, PL-30059 Krakow, Poland..
    Strong temperature effect on the sizes of the Cooper pairs in a two-band superconductor2018In: European Physical Journal B: Condensed Matter Physics, ISSN 1434-6028, E-ISSN 1434-6036, Vol. 91, no 1, article id 2Article in journal (Refereed)
    Abstract [en]

    We study the temperature dependencies of the mean sizes of the Cooper pairs in a two-band BCS-type s-wave superconductivity model with coupling cut-off in the momentum space. It is found that, in contrast to single-band systems, the size of Cooper pairs in the weaker superconductivity band can significantly decrease with a temperature increase due to an interband proximity effect. The relevant spatial behaviour of the wave functions of the Cooper pairs is analyzed. The results also indicate a possibility that the size of Cooper pairs in two-band systems may increase with an increase in temperature.

  • 1069.
    Österlind, Magnus
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Johnson, Pontus
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Karnati, Kiran
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Lagerström, Robert
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Välja, Margus
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Enterprise Architecture Evaluation using Utility theory2013In: Proceedings 17th IEEE International Enterprise Distributed Object Computing Conference Workshops (EDOCW), IEEE Computer Society, 2013, p. 347-351Conference paper (Refereed)
    Abstract [en]

    With the increase in the number of quality attributes (e.g. cost, availability, reusability), that are being considered in the process of enterprise architecture analysis, the decision maker needs a systematic way to balance these attributes against each other to obtain the best possible architecture. Utility theory addresses this need by providing methods for numerical representation of preferences of a stakeholder involved in a decision-making process. In this paper utility theory key concepts are explained with examples. The process of calculating the utility metric, which reflects stake holder's set of preferences to select the most preferred architecture scenario is explained. The paper provides an explanation of how utility theory can be applied in enterprise architecture models which are meta-object facility compliant. This paper concludes by an example comparing two quality attributes on two architecture scenarios using utility theory and calculating the decision maker's overall utility metric across both quality attributes is provided. This shows the applicability of utility theory on architecture scenario analysis with multiple quality attributes.

19202122 1051 - 1069 of 1069
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf