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  • 122701.
    Yan, Wei
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Yan, Min
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Ruan, Zhichao
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Qiu, Min
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Influence of geometrical perturbation at inner boundaries of invisibility cloaks2008In: Journal of the Optical Society of America A, ISSN 0740-3232, Vol. 25, no 4, p. 968-973Article in journal (Refereed)
    Abstract [en]

    The influence of a geometrical perturbation (5 at the inner boundaries of both cylindrical and spherical invisibility cloaks on invisibility performance is presented. The analytic solutions for such influence in the case of the general coordinate transformation are given. We show that the cylindrical cloak is more sensitive than a spherical cloak to such a perturbation. The difference results from the different asymptotic properties of eigen-functions for the cylindrical and spherical wave equations. In particular, the zeroth-order scattering coefficient for a cylindrical cloak determined by -1/ln(delta) converges to zero very slowly. The noticeable scattering induced by the slow convergence speed can be decreased by choosing appropriate coordinate transformation functions. More interestingly, the slow convergence can be overcome dramatically by putting a PEC (PMC) layer at the interior boundary of the cloak shell for TM (TE) wave.

  • 122702.
    Yan, Weiwei
    KTH, School of Information and Communication Technology (ICT).
    Software-hardware Cooperative Embedded Verification System Fusing Fingerprint Verification and Shared-key Authentication2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In order to protect the security of the commercial information, personnel information, military information, governmental information on the Internet, the claimed identity should be authenticated. Now there are three main security authentication methods: first: using user PIN, such as password; second: using physical key, such as USBKey; third: using biological authentication technology, such as fingerprint, iris, voice and palm prints, etc.

    Because of the uniqueness, invariance, and ubiquity properties of biometric authentication, biometric authentication is becoming popular, especially fingerprint recognition. However, when the fingerprint recognition information is transported on the public channel, it may be attacked, such as the fingerprint information is stolen. So a cryptology mechanism is needed to protect the fingerprint recognition information.

    In the field of embedded security authentication system, the traditional hardware implementation mechanism, such as ASIC, can satisfy requires of functions and performances, but it is not configurable, flexible, and easy to expand; the traditional software implementation mechanism, such as general purpose processor, is flexible, but the cost and the power consumption are higher than hardware implementation.

    In order to take the advantages of biometrics, cryptology, hardware implementation, and software implementation, a hardware-software cooperating embedded authentication system based on shared-key authentication and fingerprint verification is proposed. First, this system authenticates the identities of client and server by shared-key authentication, creates the current encrypt key and hash key, and then authenticates the identity of them via fingerprint recognition. During fingerprint recognition, the information of fingerprint is not needed to transmit over the public channel, so the security of fingerprint is increased. Theoretic analysis and experiments show that, this system reach very high authentication rate and security. This system can resist replay attack, server template attack, device template attack, effectively.

  • 122703.
    Yan, Wenqing
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Machine Learning for Enabling ActiveMeasurements in IoT Environments2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With the explosion of Internet of Things (IoT) technology, network operators tryto provide more and more new services related to IoT. For traditional services,operators are accustomed to using IP-layer active measurements for assessingend-to-end network performance to ensure the quality of service (QoS). Similarly,they also want to use the same methods to assess end-to-end networkperformance in IoT systems. However, due to the resource-constrained IoTenvironment, intrusive active measurements may induce energy and networkoverhead, which are sensitive topics for IoT applications.The thesis investigates a new approach where network performance metrics,such as packet loss and round-trip time, are predicted from network and environmentalfeatures, such as topology information, packet statistics, and environmentalsensing features. The overarching goal is to lower the impact ofactive measurements adjusting into resource-constrained IoT systems. The predictionfunctionality is based upon supervised machine learning algorithms. Inthis thesis, we discuss how this functionality can be implemented as part of theIoT network management system with an active measurement proxy.Evaluation of the predictive functionality is based on extensive experimentationon the EWSN'17 testbed. Probe packets are sent periodically to estimate networkperformance metrics. Simultaneously, device and infrastructure metricsare collected from each network node. After collecting the data, an ML (Machinelearning) pipeline is used to learn the relation between accessible featuresand target service metrics. To predict service-level metrics, the thesis specificallyevaluates two prediction models based on statistical learning methodsincluding linear and tree-based regression algorithms.The results for dierent scenarios and topologies show that the new approach canaccurately estimate the service-level network performance metrics for wirelesssensor networks with error rates lower than 10% for RTT and 16% for 20minaverage loss (NMAE).

  • 122704. Yanagisawa, M.
    et al.
    Korodi, F.
    Bergquist, J.
    Holmberg, A.
    Hagfeldt, A.
    Akermark, B.
    Sun, Licheng C.
    Synthesis of phthalocyanines with two carboxylic acid groups and their utilization in solar cells based on nanostructured TiO22004In: Journal of Porphyrins and Phthalocyanines, ISSN 1088-4246, E-ISSN 1099-1409, Vol. 8, no 10, p. 1228-1235Article in journal (Refereed)
    Abstract [en]

    A way of anchoring unsymmetrical phthalocyaninato-metal complexes (metal ion: zinc and ruthenium) is described. The synthesis and characterization of these complexes are presented. In case of the zinc complex, the obtained product is an aggregate, while only the monomer is obtained in the case of the ruthenium derivative. Both complexes could be attached onto the TiO2 surface by using the reported method. Both dyes are expected to form monolayers with dye molecules standing on the surface of nano-structured TiO2, forming higher-order aggregates with the zinc but not with the ruthenium complex. A highest monochromatic incident photo-to-current conversion efficiency (IPCE) of 1.6% at 690 nm was obtained for a solar cell based on the Pc-Zn sensitized nano-structured TiO2 electrode, while an IPCE of 23% at 630 nm was obtained for the Pc-Ru sensitized electrode. Overall conversion efficiencies (eta) at a simulated AM 1.5 (100 W.m(-2)) of 0.03% and 0.40% for the zinc and ruthenium complexes were achieved, respectively. The difference in efficiencies could be due to the formation of face-to-face aggregation in the former case. This work shows that the ruthenium complex, with two axial methylpyridine ligands, does not form aggregates in solution nor on the surface of TiO2, making it possible for further construction of supramolecular systems with such types of phthalocyanine.

  • 122705. Yanagisawa, M.
    et al.
    Korodi, F.
    He, J. J.
    Sun, Licheng C.
    Sundstrom, V.
    Akermark, B.
    Ruthenium phthalocyanines with axial carboxylate ligands. Synthesis and function in solar cells based on nanocrystalline TiO22002In: Journal of Porphyrins and Phthalocyanines, ISSN 1088-4246, E-ISSN 1099-1409, Vol. 6, no 3, p. 217-224Article in journal (Refereed)
    Abstract [en]

    The synthesis and characterization of phthalocyaninato-ruthenium (PcRu) complexes with potential functional axial ligands are described. The solubility of these PcRu complexes was much improved compared to their parent phthalocyanines without Ru, enabling purification by normal flash column chromatography and also NMR measurements in common solvents (e. g. DMSO-d(6) and CDCl3). Adsorption of these phthalocyanine dyes onto the surface of a semiconductor through the carboxyl group(s) in the axial ligands prevents to some extent formation of H-aggregates, which is typical for phthalocyanines. It also prevents stacking of the dye molecules on the surface. The photovoltaic behavior of sandwich solar cells based on nanostructured TiO2 films sensitized by these PcRu complexes was studied under irradiation with visible light. For a solar cell based on bis(4-carboxypyridine)-phthalocyaninato ruthenium(II) (1) sensitized nanoporous-nanocrystalline TiO2, a monochromatic incident photon-to-current conversion efficiency (IPCE) of 21% was obtained at 640 nm. The overall conversion efficiency (eta) was 0.61%, which is one of the best results for a solar cell based on a phthalocyanine dye. For a cell based on (4-carboxypyridine)-(4-(2-ethoxy)ethyloxycarbonylpyridine)-2,3,9,10,16,17,23,24-octa(n-pentyloxy)-phthalocyaninato ruthenium(II) (5) sensitized TiO2, a IPCE of 6.6% at 640 nm and eta of 0.58% were obtained.

  • 122706. Yanamandra, Kiran
    et al.
    Alexeyev, Oleg
    Zamotin, Vladimir
    Srivastava, Vaibhav
    Umeå Plant Science Center, Umeå University, Umeå, Sweden.
    Shchukarev, Andrei
    Brorsson, Ann-Christin
    Tartaglia, Gian Gaetano
    Vogl, Thomas
    Kayed, Rakez
    Wingsle, Gunnar
    Olsson, Jan
    Dobson, Christopher M.
    Bergh, Anders
    Elgh, Fredrik
    Morozova-Roche, Ludmilla A.
    Amyloid formation by the pro-inflammatory S100A8/A9 proteins in the ageing prostate2009In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 4, no 5Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The conversion of soluble peptides and proteins into polymeric amyloid structures is a hallmark of many age-related degenerative disorders, including Alzheimer's disease, type II diabetes and a variety of systemic amyloidoses. We report here that amyloid formation is linked to another major age-related phenomenon--prostate tissue remodelling in middle-aged and elderly men.

    METHODOLOGY/PRINCIPAL FINDINGS: By using multidisciplinary analysis of corpora amylacea inclusions in prostate glands of patients diagnosed with prostate cancer we have revealed that their major components are the amyloid forms of S100A8 and S100A9 proteins associated with numerous inflammatory conditions and types of cancer. In prostate protease rich environment the amyloids are stabilized by dystrophic calcification and lateral thickening. We have demonstrated that material closely resembling CA can be produced from S100A8/A9 in vitro under native and acidic conditions and shows the characters of amyloids. This process is facilitated by calcium or zinc, both of which are abundant in ex vivo inclusions. These observations were supported by computational analysis of the S100A8/A9 calcium-dependent aggregation propensity profiles. We found DNA and proteins from Escherichia coli in CA bodies, suggesting that their formation is likely to be associated with bacterial infection. CA inclusions were also accompanied by the activation of macrophages and by an increase in the concentration of S100A8/A9 in the surrounding tissues, indicating inflammatory reactions.

    CONCLUSIONS/SIGNIFICANCE: These findings, taken together, suggest a link between bacterial infection, inflammation and amyloid deposition of pro-inflammatory proteins S100A8/A9 in the prostate gland, such that a self-perpetuating cycle can be triggered and may increase the risk of malignancy in the ageing prostate. The results provide strong support for the prediction that the generic ability of polypeptide chains to convert into amyloids could lead to their involvement in an increasing number of otherwise apparently unrelated diseases, particularly those associated with ageing.

  • 122707. Yanaz Çınar, Ö.
    et al.
    Boij, Susann
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Çınar, G.
    Nilsson, B.
    Sudden area expansion in ducts with flow – A comparison between cylindrical and rectangular modelling2017In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 396, p. 307-324Article in journal (Refereed)
    Abstract [en]

    The acoustic properties of an area expansion are analyzed for frequencies where flow acoustic interaction may have a significant influence due to flow separation and vortex shedding. It is investigated why this interaction, which is seen in experimental data on a cylindrical duct as a resonance at a particular Strouhal number of order one, is present in rectangular but not in cylindrical modelling that would be expected to be more realistic; both models consider a plug flow. An analytic method that is suitable for identifying possible reasons for the discrepancies between the two geometries is used. The previously published rectangular model is generalized to the cylindrical case and both models are used to simulate results for all elements in the plane wave scattering matrix and for all parameters for which experimental results are available. The comparison between the two models and between models and measured data is thus not restricted to the flow acoustic induced resonance. The results show that the two geometries in general perform equally when compared with the experimental results, but that the rectangular modelling indeed performs better for some cases. This occurs around a critical Strouhal number, and for higher Mach number. Using the analytic form of the solution, it is shown that the observed discrepancy is related to interaction between the damped hydrodynamic mode and a downstream propagating higher order acoustic mode. Such interaction is not present in the corresponding quiescent duct, and is related to the presence of the shear layer. The analysis shows that the structure of the higher order acoustic modes is different for the cylindrical and rectangular case, respectively, causing the difference in resonant behaviour.

  • 122708. Yang, Ang
    et al.
    Fei, Zesong
    Xing, Chengwen
    Xiao, Ming
    KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Yuan, Jinhong
    Kuang, Jingming
    Design of Binary Network Codes for Multiuser Multiway Relay Networks2013In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 62, no 8, p. 3786-3799Article in journal (Refereed)
    Abstract [en]

    We study multiuser multiway relay networks where N user nodes exchange their information through a single-relay node. We use network coding (NC) in the relay to increase the throughput. Due to the limitation of complexity, we only consider the binary multiuser NC (BMNC) in the relay. We study the BMNC matrix [in GF(2)] and propose several design criteria on the BMNC matrix to improve the symbol error probability (SEP) performance. Closed-form expressions of the SEP of the system are provided. Moreover, an upper bound of the SEP is also proposed to provide further insights into system performance. Then, BMNC matrices are designed to minimize error probabilities.

  • 122709.
    Yang, Annika Fang
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    A pre-study of Hot Metal Desulphurization2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this thesis work, some basic concepts about desulphurizationof hot metal have been done based on a literature study. Two experimentaltrials have also been carried out to study the slags: one consider as areference and in the other trial, the amount of calcium carbide was reduced by150 kg. The average carbide efficiency has been improved from 21.3% in trial 1 to 26.0% in trail 2. Metaldroplets containing iron oxides are found in three of eight heats and most ofmetal droplets are surrounded by Ti-compounds. The slags mainly consisted of (Ca,O, Si) and (Ca, S), with some low content of other elements.

  • 122710.
    Yang, Annika Fang
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Evaluation of Iron Losses during Desulfurazation of Hot Metal by Modern Reagents2015Licentiate thesis, comprehensive summary (Other academic)
  • 122711.
    Yang, Annika Fang
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Karasev, Andrey
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Jönsson, Pär
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Behavior of metal droplets in slags during desulphurization of hot metal2015In: Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015, Chinese Society for Metals , 2015, p. 80-83Conference paper (Refereed)
    Abstract [en]

    An intensive desulphurization of hot metal can result in significant additional losses of iron in the slag. These iron losses during desulphurization of hot metal can reach a value of 1.5%-2.5% of the total amount of processed hot metal. The majority of the iron losses are present in the slag in form of different iron droplets. Therefore, the knowledge of the formation and behavior of these droplets in slags can help to significantly decrease the iron losses during desulphurization of hot metal. The characteristics of different iron droplets such as the morphology, number, size, composition and solidification structure were investigated in industrial slag samples taken from a ladle after desulphurization of hot metal. It was found that different morphologies of iron droplets in slag depend on the mechanism for the dispersion of the hot metal droplets into the slag, the characteristics of slag (amount, viscosity, melting temperature, etc.) as well as some technological parameters (mode and intensity of injection of reagents for desulphurization, stirring rate of hot metal in the ladle, etc.). The main mechanisms for involving of different metal droplets into the slag and their behavior during desulphurization process are discussed based on the obtained characteristics of the metal droplets.

  • 122712.
    Yang, Annika Fang
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Karasev, Andrey
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Jönsson, Pär Göran
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Characterization of Metal Droplets in Slag after Desulfurization of Hot Metal2015In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 55, no 3, p. 570-577Article in journal (Refereed)
    Abstract [en]

    Iron losses in slag during an intensive desulfurization of hot metal can reach 0.6-1.1% from the total amount of processed hot metal. The characteristics of different metal droplets (such as morphology, number, size, composition and solidification structure) in industrial slag samples after desulfurization were investigated using SEM. All metal droplets in the slag were classified into three groups according to morphology: Type A - spherical/oval; Type B - spherical/irregular; Type C - irregular. Thereafter, some mechanisms for involving of different metal droplets into the slag during desulfurization process were studied based on obtained characteristics of metal droplets. Moreover, a possibility to remove those metal droplets from the liquid slag was estimated based on Stokes law. In addition, the effect of some parameters (such as slag viscosity and size of different metal droplets in this slag) on the possibility to reduce the iron losses during desulfurization of hot metal was considered.

  • 122713.
    Yang, Annika Fang
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Karasev, Andrey
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Jönsson, Pär Göran
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Effect of nepheline syenite on iron losses in slags during desulphurization of hot metalManuscript (preprint) (Other academic)
  • 122714.
    Yang, Annika Fang
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Karasev, Andrey
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Jönsson, Pär Göran
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Effect of Nepheline Syenite on Iron Losses in Slags during Desulphurization of Hot Metal2015In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344XArticle in journal (Refereed)
    Abstract [en]

    The effect of injection of nepheline syenite (NS) together with CaC<inf>2</inf> and C on the iron losses in form of metal droplets in a slag during desulphurization of hot metal is investigated in industrial trials. The characteristics of different metal droplets (such as morphology, number, size and composition) in slags of trials without and with injection of a NS are investigated using SEM. All metal droplets in the slag are classified into three groups according to morphology: Type A-spherical/oval; Type B-spherical/irregular; Type C-irregular. It is found that the addition of NS influences the compositions of hot metal, slag and metal droplets in slag. As a result, the amount (area fraction) and size of metal droplets decreased for Type A and B and increased significantly for Type C droplets present in the slag. The effect of injection of nepheline syenite together with CaC<inf>2</inf> and C on the iron losses in form of metal droplets in a slag during desulphurization of hot metal is investigated in industrial trials. The characteristics and behavior of different metal droplets in slags of trials without and with injection of a nepheline syenite are investigated.

  • 122715. Yang, B.
    et al.
    Gong, Y.
    Hong, X.
    Chen, Jiajia
    Heatsink topology based optical interconnect for datacenters2017In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper (Refereed)
    Abstract [en]

    We propose an optical interconnect architecture based on heatsink topology to enhance reliability for large-scale datacenters. The experimental demonstration has been carried out to verify the transmission performance of the proposed architecture.

  • 122716. Yang, B.
    et al.
    He, H.
    Hu, Xiaoming
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Detecting community structure in networks via consensus dynamics and spatial transformation2017In: Physica A: Statistical Mechanics and its Applications, ISSN 0378-4371, E-ISSN 1873-2119, Vol. 483, p. 156-170Article in journal (Refereed)
    Abstract [en]

    We present a novel clustering algorithm for community detection, based on the dynamics towards consensus and spatial transformation. The community detection problem is translated to a clustering problem in the N-dimensional Euclidean space by three stages: (1) the dynamics running on a network is emulated to a procedure of gas diffusion in a finite space; (2) the pressure distribution vectors are used to describe the influence that each node exerts on the whole network; (3) the similarity measures between two nodes are quantified in the N-dimensional Euclidean space by k-Nearest Neighbors method. After such steps, we could merge clusters according to their similarity distances and show the community structure of a network by a hierarchical clustering tree. Tests on several benchmark networks are presented and the results show the effectiveness and reliability of our algorithm.

  • 122717. Yang, B.
    et al.
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Distributed optimization: A Tutorial Overview2010In: Networked Control Systems / [ed] Bemporad, A.; Heemels, M.; Johansson, M., Berlin: Springer, 2010Chapter in book (Other academic)
  • 122718. Yang, B.
    et al.
    Yang, L.
    Hu, R.
    Sheng, Z.
    Dai, D. X.
    Liu, Q. K.
    He, Sailing
    Fabrication and Characterization of Small Optical Ridge Waveguides Based on SU-8 Polymer2009In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 27, no 18, p. 4091-4096Article in journal (Refereed)
    Abstract [en]

    Small SU-8 ridge optical waveguides with an air cladding and a SiO2 buffer on Si substrate have been realized by using a direct ultraviolet (UV) photolithography technology. The propagation loss measured by the cut-back method is about 0.1 dB/mm (@1550 nm) when the core width is 2.8 mu m. The bending losses of the present SU-8 optical ridge waveguides are also characterized. The measured results show that the bending loss decreases exponentially as the bending radius increases and the total loss can be reduced effectively by introducing an appropriate offset between two connected sections with different curvatures. A small bending radius (as small as 75 mu m) is still allowed for the requirement of a small bending loss (< 0.1 dB) when an offset of 0.1 mu m is introduced. Finally, by using this kind of waveguide, a small 1 x 2 Y-branch power splitter is fabricated and characterized.

  • 122719. YANG, BH
    et al.
    GISLASON, HP
    LINNARSSON, MARGARETA K.
    KTH, Superseded Departments, Electronics.
    LITHIUM PASSIVATION OF ZN AND CD ACCEPTORS IN P-TYPE GAAS1993In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 48, no 16, p. 12345-12348Article in journal (Refereed)
    Abstract [en]

    We report lithium passivation of the shallow acceptors Zn and Cd in p-type GaAs which we attribute to the formation of neutral Li-Zn and Li-Cd complexes. Similar to hydrogen, another group-I element, lithium strongly reduces the concentration of free holes when introduced into p-type GaAs. The passivation is inferred from an increase of both the hole mobility and the resisitivity throughout the bulk of the sample. It is observed most clearly for Li concentrations comparable to the shallow-acceptor concentration. In addition, compensation of shallow acceptors by randomly distributed donors is present in varying degree in the Li-diffused samples. Unlike hydrogenation of n-type GaAs, Li doping shows no evidence of neutralizing shallow donors in GaAs.

  • 122720.
    Yang, Bin
    et al.
    Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China.;Umea Univ, Dept Appl Phys & Elect, S-90187 Umea, Sweden..
    Cheng, Xiaogang
    KTH, School of Electrical Engineering and Computer Science (EECS). Nanjing Univ Posts & Telecommun, Coll Telecommun & Informat Engn, Nanjing 210003, Jiangsu, Peoples R China.;Swiss Fed Inst Technol, Comp Vis Lab, CH-8092 Zurich, Switzerland..
    Dai, Dengxin
    Swiss Fed Inst Technol, Comp Vis Lab, CH-8092 Zurich, Switzerland..
    Olofsson, Thomas
    Umea Univ, Dept Appl Phys & Elect, S-90187 Umea, Sweden..
    Li, Haibo
    KTH, School of Electrical Engineering and Computer Science (EECS), Media Technology and Interaction Design, MID.
    Meier, Alan
    Univ Calif Davis, Energy & Efficiency Inst, Davis, CA 95616 USA..
    Real-time and contactless measurements of thermal discomfort based on human poses for energy efficient control of buildings2019In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 162, article id UNSP 106284Article in journal (Refereed)
    Abstract [en]

    Individual thermal discomfort perception gives important feedback signals for energy efficient control of building heating, ventilation and air conditioning systems. However, there is few effective method to measure thermal discomfort status of occupants in a real-time and contactless way. A novel method based on contactless measurements of human thermal discomfort status was presented. Images of occupant poses, which are related to thermoregulation mechanisms, were captured by a digital camera and the corresponding 2D coordinates were obtained. These poses were converted into skeletal configurations. An algorithm was developed to recognize different poses related to thermal discomfort, such as hugging oneself or wiping sweat off the brow. The algorithm could recognize twelve thermal discomfort related human poses. These poses were derived from a questionnaire survey of 369 human subjects. Some other human subjects participated in the validation experiments of the proposed method. All twelve thermal discomfort related poses can be recognized effectively.

  • 122721.
    Yang, Bo
    et al.
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Cheng, Weizheng
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Hu, Xiaoming
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Zhu, Chao
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Yu, Xin
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Li, Xu
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Huang, Tao
    Wuhan Univ Technol, Sch Automat, Wuhan 430070, Hubei, Peoples R China..
    Seeking community structure in networks via biogeography-based optimization with consensus dynamics2019In: Physica A: Statistical Mechanics and its Applications, ISSN 0378-4371, E-ISSN 1873-2119, Vol. 527, article id 121188Article in journal (Refereed)
    Abstract [en]

    Uncovering the community structure hidden in networks is crucial for understanding the function of networks. In this paper, an algorithm of biogeography-based optimization with consensus dynamics for community detection is proposed. The problems of seeking community structures in networks are exquisitely embedded into the framework of biogeography-based optimization. Hence the community structure unveiled in such an evolutionary and global manner is corresponding to the habitat with maximum modularity. We present a dynamical framework for generating initial distribution of solutions for the evolutionary process using consensus dynamics, which gives a reasonably good estimate of the community structure based on the topological information. Thereof, the proposed dynamical method of initialization promotes the efficiency of optimal solution search significantly, compared with the traditional random initialization. Then, the obtained partition is refined using biogeography-based optimization. In addition, a preferential selection strategy for generating the new solutions is developed based on local network topology. Furthermore, we also proposed an adaptive mutation operator that enhances the exploration ability of our evolutionary algorithm. The experimental results on both artificial random and real-world networks indicate the effectiveness and reliability of our algorithm. These findings shed new light on the role played by topological knowledge of networks extracted from consensus dynamics in the evolving optimization processes when finding complex mesoscale structures in networks such as community structure.

  • 122722.
    Yang, Bo
    et al.
    KTH, School of Electrical Engineering (EES). Yanshan University, China.
    Shen, Y.
    Feng, G.
    Guan, X.
    Fair resource allocation using bargaining over OFDMA relay networks2009In: Proceedings of the 48th IEEE Conference on Decision and Control, 2009 held jointly with the 2009 28th Chinese Control Conference. CDC/CCC, IEEE , 2009, p. 585-590Conference paper (Refereed)
    Abstract [en]

    This paper studies fair resource allocation schemes for orthogonal frequency-division multiple-access (OFDMA) with the decode-and-forward relaying strategy. To satisfy the heterogenous rate requirement of each user while considering the fairness and efficiency as performance indices, the bargaining theory is applied to allocate resource at a relay node to multiple source nodes. Motivated by the fact that each source's achievable rate on individual sub-carrier is limited by decodability constraint, we apply the Kalai-Smorodinsky bargaining (KSB) theory to allocate resource at the relay fairly. KSB ensures that all sources incur the same surplus rate penalty relative to the maximal surplus rate. To improve system efficiency, the Nash bargaining (NB) problem is formulated to maximize NB solution fairness criterion by exploiting multiuser diversity. A simple yet efficient algorithm is derived to assign sub-carrier and power at the relay for multiple users. Simulation results demonstrate that both KSB-based solution and NB solution can improve total rates while maintaining fairness among sources.

  • 122723. Yang, Bo
    et al.
    Shen, Yanyan
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Chen, Cailian
    Guan, Xinping
    Opportunistic multichannel access with decentralized channel state information2015In: Wireless Communications & Mobile Computing, ISSN 1530-8669, E-ISSN 1530-8677, Vol. 15, no 2, p. 322-339Article in journal (Refereed)
    Abstract [en]

    This paper considers multiaccess control for the uplink in orthogonal frequency division multiple access wireless networks. To avoid the extensive information exchange associated with centralized approaches, we formulate the decentralized access control problem with the contention power constraint as a Bayesian game, mapping time-varying channel state information into contention strategies. By exploiting the problem structure, a strategy where users access the channels with probability one if the observed channel gain is above a predetermined threshold is shown to be optimal. It is also shown that the energy consumption of the threshold strategy will not exceed that of randomized strategies. The game is then equivalently reformulated as one of finding the threshold value in a distributed manner, and the existence and uniqueness of Bayesian Nash equilibria is established. A distributed algorithm based on Lagrange duality is proposed to approach the unique equilibrium, and the algorithm is shown to be globally stable. In a homogeneous system, the performance loss of the proposed scheme is proved to be bounded compared with a centralized channel allocation scheme. Contrary to other proposals, our method allows for heterogeneous channel state information and achieves a comparable throughput with reduced power.

  • 122724. Yang, Bo
    et al.
    Shen, Yanyan
    Johansson, Mikael
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Guan, Xinping
    Threshold-based Multichannel Access with Energy Constraint2010In: 2010 IEEE International Conference on Communications, 2010Conference paper (Refereed)
    Abstract [en]

    This paper considers multiaccess control for the uplink in orthogonal-frequency-division-multiple-access (OFDMA) wireless networks. To avoid extensive information exchange with the access point in centralized approaches, we propose a distributed threshold-based scheme, where each user accesses multiple channels simultaneously based on a comparison between measured channel gains and a channel gain threshold. Each user will adapts its channel gain threshold based on local measurements of collision on each channel and the energy consumption for channel contention. The problem is formulated as a constrained non-cooperative game. We show existence and uniqueness of the Nash equilibrium. A gradient-based algorithm is proposed to update the channel gain threshold. Furthermore, the convergence of this algorithm is proved. In addition, for heterogeneous systems, our proposed scheme can maintain multiuser diversity gains considering the time-varying channel gain and energy consumption. Compared with peer distributed OFDMA schemes and random channel selection algorithms, our proposed schemes reduce overhead and achieve a higher throughput.

  • 122725.
    Yang, Can
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics.
    Discovering Contiguous Sequential Patterns in Network-Constrained Movement2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    A large proportion of movement in urban area is constrained to a road network such as pedestrian, bicycle and vehicle. That movement information is commonly collected by Global Positioning System (GPS) sensor, which has generated large collections of trajectories. A contiguous sequential pattern (CSP) in these trajectories represents a certain number of objects traversing a sequence of spatially contiguous edges in the network, which is an intuitive way to study regularities in network-constrained movement. CSPs are closely related to route choices and traffic flows and can be useful in travel demand modeling and transportation planning. However, the efficient and scalable extraction of CSPs and effective visualization of the heavily overlapping CSPs are remaining challenges.

    To address these challenges, the thesis develops two algorithms and a visual analytics system. Firstly, a fast map matching (FMM) algorithm is designed for matching a noisy trajectory to a sequence of edges traversed by the object with a high performance. Secondly, an algorithm called bidirectional pruning based closed contiguous sequential pattern mining (BP-CCSM) is developed to extract sequential patterns with closeness and contiguity constraint from the map matched trajectories. Finally, a visual analytics system called sequential pattern explorer for trajectories (SPET) is designed for interactive mining and visualization of CSPs in a large collection of trajectories.

    Extensive experiments are performed on a real-world taxi trip GPS dataset to evaluate the algorithms and visual analytics system. The results demonstrate that FMM achieves a superior performance by replacing repeated routing queries with hash table lookups. BP-CCSM considerably outperforms three state-of-the-art algorithms in terms of running time and memory consumption. SPET enables the user to efficiently and conveniently explore spatial and temporal variations of CSPs in network-constrained movement.

  • 122726.
    YANG, CAN
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Geoinformatics.
    Multi-Agent Simulation to Study Sustainable Travel Behaviors in Stockholm County2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

     In this master thesis, multiagent simulation was implemented with MATSim to study the change would take place on travel behaviors in Stockholm County when all residents travel in a sustainable way under a predefined emission limit. In this multiagent simulation, individual person was simulated as agent with attributes, daily travel plans and behaviors. The attributes contained home location, workplace locations, and some socioeconomic attributes, which were assigned according to the demographic data and travelling statistics data collected. Two trips, morning commuting from home to workplace and evening commuting from workplace to home, were simulated while the daily travel plans included travelling by car, public transit, bike and working at home. Each day, the person was set to select a travel plan based on socioeconomic attributes, his current greenhouse gas emission and a monthly emission limit. The selected plan was then executed and his emission was updated. In the model, a working population of 771614 people in Stockholm County was used and one month period with 21 working days was simulated. Totally four monthly emission limits were tested: 30kg, 37kg, 50kg, and infinity representing the current scenario. The research shows that multiagent simulation is effective in simulating individual travel behaviors. The results suggest that under current scenario car is the most frequently selected travel mode accounting for 32%, followed by public transit 31%. There are about 12% of people working at home and 25% travelling by bike. Nearly 1 percent fails to select a plan because of the plan selection setting. When emission limit is set, the percentage of people changing travel behaviors is 21.2%, 25.8% and 29.9% under the emission limit 50kg, 37kg and 30kg respectively. Most of them would abort from car and public transit to bike, public transit or even failing to keep their emission under the limit. The percentage of people changing plan to bike is 9.4%, 11.8%, 13.4% under the three limits 50kg, 37kg and 30kg respectively while the percentage of people changing plan to public transit or failure is 10.2%, 12.5% and 15.2%. The result also shows that when 37kg limit is set, the people having problems with keeping their emission under the limit are mainly distributed at three regions: Stockholm City, some cities in southwest and northeast of Stockholm County, where there would also be more demand for public transit service. The people changing plans to bike are mainly  distributed  in  Stockholm  City  area,  where  sustainable  travel  behavior  should  be promoted

  • 122727.
    Yang, Can
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics. KTH, Royal Institute of Technology in Sweden.
    Gidofalvi, Gyözö
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics.
    Fast map matching, an algorithm integrating hidden Markov model with precomputation2017In: International Journal of Geographical Information Science, ISSN 1365-8816, E-ISSN 1365-8824, p. 1-24Article in journal (Refereed)
    Abstract [en]

    Wide deployment of global positioning system (GPS) sensors has generated a large amount of data with numerous applications in transportation research. Due to the observation error, a map matching (MM) process is commonly performed to infer a path on a road network from a noisy GPS trajectory. The increasing data volume calls for the design of efficient and scalable MM algorithms. This article presents fast map matching (FMM), an algorithm integrating hidden Markov model with precomputation, and provides an open-source implementation. An upper bounded origin-destination table is precomputed to store all pairs of shortest paths within a certain length in the road network. As a benefit, repeated routing queries known as the bottleneck of MM are replaced with hash table search. Additionally, several degenerate cases and a problem of reverse movement are identified and addressed in FMM. Experiments on a large collection of real-world taxi trip trajectories demonstrate that FMM has achieved a considerable single-processor MM speed of 25,000–45,000 points/second varying with the output mode. Investigation on the running time of different steps in FMM reveals that after precomputation is employed, the new bottleneck is located in candidate search, and more specifically, the projection of a GPS point to the polyline of a road edge. Reverse movement in the result is also effectively reduced by applying a penalty.

  • 122728.
    Yang, Can
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics.
    Gidofalvi, Gyözö
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics.
    Mining and visual exploration of closed contiguous sequential patterns in trajectories2018In: International Journal of Geographical Information Science, ISSN 1365-8816, E-ISSN 1365-8824, Vol. 32, no 7, p. 1282-1303Article in journal (Refereed)
    Abstract [en]

    Large collections of trajectories provide rich insight into movement patterns of the tracked objects. By map matching trajectories to a road network as sequences of road edge IDs, contiguous sequential patterns can be extracted as a certain number of objects traversing a specific path, which provides valuable information in travel demand modeling and transportation planning. Mining and visualization of such patterns still face challenges in efficiency, scalability, and visual cluttering of patterns. To address these challenges, this article firstly proposes a Bidirectional Pruning based Closed Contiguous Sequential pattern Mining (BP-CCSM) algorithm. By employing tree structures to create partitions of input sequences and candidate patterns, closeness can be checked efficiently by comparing nodes in a tree. Secondly, a system called Sequential Pattern Explorer for Trajectories (SPET) is built for spatial and temporal exploration of the mined patterns. Two types of maps are designed where a conventional traffic map gives an overview of the movement patterns and a dynamic offset map presents detailed information according to user-specified filters. Extensive experiments are performed in this article. BP-CCSM is compared with three other state-of-the-art algorithms on two datasets: a small public dataset containing clickstreams from an e-commerce and a large global positioning system dataset with more than 600,000 taxi trip trajectories. The results show that BP-CCSM considerably outperforms three other algorithms in terms of running time and memory consumption. Besides, SPET provides an efficient and convenient way to inspect spatial and temporal variations in closed contiguous sequential patterns from a large number of trajectories.

  • 122729.
    Yang, Can
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics. KTH, Royal Institute of Technology in Sweden.
    Gyözö, Gidofalvi
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics. KTH, Royal Institute of Technology in Sweden.
    Interactive Visual Exploration of Most LikelyMovements2016In: Geospatial data in a changing world selected papers of the 19th AGILE Conference on Geographic Information Science, Springer, 2016Conference paper (Refereed)
  • 122730. Yang, Chao
    et al.
    Wu, Junfeng
    KTH, School of Electrical Engineering (EES).
    Ren, Xiaoqiang
    Yang, Wen
    Shi, Hongbo
    Shi, Ling
    Deterministic Sensor Selection for Centralized State Estimation Under Limited Communication Resource2015In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 63, no 9, p. 2336-2348Article in journal (Refereed)
    Abstract [en]

    This paper studies a sensor selection problem. A group of sensors measure the state of a process and send their measurements to a remote estimator. Due to communication constraints, only limited sensors are allowed to communicate with the estimator. The paper intends to answer which sensors should be chosen such that the estimation performance of the estimator is optimized. Both reliable and packet-dropping channels are considered. It is required to minimize the steady-state estimation error covariance for reliable channels and to minimize the upper bound of the expected estimation error covariance for packet-dropping channels. For both scenarios, the original optimization problems are transformed to problems which can be solved by convex optimization techniques.

  • 122731.
    Yang, Chen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Thermodynamic Cycles using Carbon Dioxide as Working Fluid: CO2 transcritical power cycle study2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The interest in utilizing the energy in low‐grade heat sources and waste heat is increasing. There is an abundance of such heat sources, but their utilization today is insufficient, mainly due to the limitations of the conventional power cycles in such applications, such as low efficiency, bulky size or moisture at the expansion outlet (e.g. problems for turbine blades).

    Carbon dioxide (CO2) has been widely investigated for use as a working fluid in refrigeration cycles, because it has no ozonedepleting potential (ODP) and low global warming potential (GWP). It is also inexpensive, non‐explosive, non‐flammable and abundant in nature. At the same time, CO2 has advantages in use as a working fluid in low‐grade heat resource recovery and energy conversion from waste heat, mainly because it can create a better matching to the heat source temperature profile in the supercritical region to reduce the irreversibility during the heating process. Nevertheless, the research in such applications is very limited.

    This study investigates the potential of using carbon dioxide as a working fluid in power cycles for low‐grade heat source/waste heat recovery.

    At the beginning of this study, basic CO2 power cycles, namely carbon dioxide transcritical power cycle, carbon dioxide Brayton cycle and carbon dioxide cooling and power combined cycle were simulated and studied to see their potential in different applications (e.g. low‐grade heat source applications, automobile applications and heat and power cogeneration applications). For the applications in automobile industries, low pressure drop on the engine’s exhaust gas side is crucial to not reducing the engine’s performance. Therefore, a heat exchanger with low‐pressure drop on the secondary side (i.e. the gas side) was also designed, simulated and tested with water and engine exhaust gases at the early stage of the study (Appendix 2).

    The study subsequently focused mainly on carbon dioxide transcritical power cycle, which has a wide range of applications. The performance of the carbon dioxide transcritical power cycle has been simulated and compared with the other most commonly employed power cycles in lowgrade heat source utilizations, i.e. the Organic Rankin Cycle (ORC). Furthermore, the annual performance of the carbon dioxide transcritical power cycle in utilizing the low‐grade heat source (i.e. solar) has also been simulated and analyzed with dynamic simulation in this work.

    Last but not least, the matching of the temperature profiles in the heat exchangers for CO2 and its influence on the cycle performance have also been discussed. Second law thermodynamic analyses of the carbon dioxide transcritical power systems have been completed.

    The simulation models have been mainly developed in the software known as Engineering Equation Solver (EES)1 for both cycle analyses and computer‐aided heat exchanger designs. The model has also been connected to TRNSYS for dynamic system annual performance simulations. In addition, Refprop 7.02 is used for calculating the working fluid properties, and the CFD tool (COMSOL) 3 has been employed to investigate the particular phenomena influencing the heat exchanger performance.

  • 122732.
    Yang, Chen
    et al.
    Univ Hong Kong, Dept Ind & Mfg Syst Engn, HKU ZIRI Lab Phys Internet, Hong Kong, Peoples R China. an, Shulin.
    Lan, Shulin
    Wang, Lihui
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Research on coordinated development between metropolitan economy and gistics using big data and Haken model2019In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 57, no 4, p. 1176-1189Article in journal (Refereed)
    Abstract [en]

    To quantitatively study the relationship and mutual effects between tropolitan economy and logistics is an important, yet pending issue, ich can scientifically guide the urban planning and investment. rough the identified evaluation indexes of metropolitan logistics and onomic development, this paper first builds up an evaluation process del of metropolitan economic and logistics development, based on big ta analytics (BDA), the entropy evaluation method, and the maximum viation method. BDA can help extract the exact data about the dicators of metropolitan economy and logistics. Then a Haken model is opted to ravel out the dynamic co-evolutionary law of economy and gistics in five Chinese cities, which complements the above static aluation. The results show that the economic development is an order rameter and plays a key role in the coordinated development of tropolitan logistics and economy. However, from 2013 to 2014, these ve cities had not established an orderly evolved positive-feedback chanism through which economic development promotes the coordinated velopment of metropolitan logistics and economic development.

  • 122733. Yang, Chun-Yao
    et al.
    Lin, Chun
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Su, Wei-Min
    Canalias, Carlota
    Chuu, Chih-Sung
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Parametric down-conversion with nonideal and random quasi-phase-matching2016In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 26079Article in journal (Refereed)
    Abstract [en]

    Quasi-phase-matching (QPM) has enriched the capacity of parametric down-conversion (PDC) in generating biphotons for many fundamental tests and advanced applications. However, it is not clear how the nonidealities and randomness in the QPM grating of a parametric down-converter may affect the quantum properties of the biphotons. This paper intends to provide insights into the interplay between PDC and nonideal or random QPM structures. Using a periodically poled nonlinear crystal with short periodicity, we conduct experimental and theoretical studies of PDC subject to nonideal duty cycle and random errors in domain lengths. We report the observation of biphotons emerging through noncritical birefringent-phasematching, which is impossible to occur in PDC with an ideal QPM grating, and a biphoton spectrum determined by the details of nonidealities and randomness. We also observed QPM biphotons with a diminished strength. These features are both confirmed by our theory. Our work provides new perspectives for biphoton engineering with QPM.

  • 122734. Yang, D.
    et al.
    Jacobson, B.
    Jonasson, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.
    Gordon, T. J.
    Minimizing Vehicle Post Impact Path Lateral Deviation Using Optimized Braking And Steering Sequences2014In: International Journal of Automotive Technology, ISSN 1229-9138, E-ISSN 1976-3832, Vol. 15, no 1, p. 7-17Article in journal (Refereed)
    Abstract [en]

    This paper investigates the optimal control of a vehicle, after a light impact during a traffic accident. To reduce the risk of secondary events, the control target is set: to minimize the maximum lateral deviation from the initial path. In previous analysis path control was achieved by the active control of individual wheel braking. The present paper examines potential benefits from the additional control of front steering angles. Numerical optimization is used to determine optimal control sequences for both actuator configurations. It is found that steering provides significant control benefits, though not for all post-impact kinematics. For all cases considered, the optimal control operates at the boundary of the control domain of available forces and moments. This domain is expanded when steering is available, and there exists an expanded range of conditions for which coupled control of yaw moments and lateral forces is the most effective control strategy. The sensitivity of vehicle response to the individual actuator controls is studied; it reveals this sensitivity is related to the actuator bandwidth and the lack of any dynamic cost in the longitudinal direction. This motivates a further analysis which includes longitudinal and lateral dynamics in the cost function. This is broadly related to real-world crash risks. Further, different versions of such cost functions are compared as a basis for implementation in a closed-loop controller.

  • 122735. Yang, D.
    et al.
    Jonasson, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics. Volvo Cars, Sweden.
    Halleröd, T.
    Johansson, R.
    Evaluation of an evasive manoeuvre assistance system at imminent side collisions2017In: Advanced Vehicle Control AVEC’16 - Proceedings of the 13th International Symposium on Advanced Vehicle Control AVEC’16, CRC Press/Balkema , 2017, p. 55-60Conference paper (Refereed)
    Abstract [en]

    In this paper, the performance of an Evasive Manoeuvre Assistance System is evaluated on the test track, where an imminent half-overlapping side collision scenario is reconstructed. The control function here aims to reduce the steering effort for an emergency swerve in front of obstacle and to ease the following recovery into the driver perceived safe zone. This is realized by combined differential braking and steering torque overlay, which improves the agreement between steering input and vehicle response. Preliminary test results have shown that the function has a great potential to reduce collision risk at the presence of suddenly appeared obstacle in front.

  • 122736.
    Yang, Dechang
    et al.
    China Agr Univ, Coll Informat & Elect Engn, Beijing 100083, Peoples R China..
    Liao, Wenlong
    Tianjin Univ, Minist Educ, Key Lab Smart Grid, Tianjin 300072, Peoples R China..
    Wang, Yusen
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Zeng, Keqing
    NYU, Tandon Sch Engn, New York, NY 11201 USA..
    Chen, Qiuyue
    China Agr Univ, Coll Informat & Elect Engn, Beijing 100083, Peoples R China..
    Li, Dingqian
    China Agr Univ, Coll Informat & Elect Engn, Beijing 100083, Peoples R China..
    Data-Driven Optimization Control for Dynamic Reconfiguration of Distribution Network2018In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, no 10, article id 2628Article in journal (Refereed)
    Abstract [en]

    To improve the reliability and reduce power loss of distribution network, the dynamic reconfiguration is widely used. It is employed to find an optimal topology for each time interval while satisfying all the physical constraints. Dynamic reconfiguration is a non-deterministic polynomial problem, which is difficult to find the optimal control strategy in a short time. The conventional methods solved complex model of dynamic reconfiguration in different ways, but only local optimal solutions can be found. In this paper, a data-driven optimization control for dynamic reconfiguration of distribution network is proposed. Through two stages that include rough matching and fine matching, the historical cases which are similar to current case are chosen as candidate cases. The optimal control strategy suitable for the current case is selected according to dynamic time warping (DTW) distances which evaluate the similarity between the candidate cases and the current case. The advantage of the proposed approach is that it does not need to solve complex model of dynamic reconfiguration, and only uses historical data to obtain the optimal control strategy for the current case. The cases study shows that the optimization results and the computation time of the proposed approach are superior to conventional methods.

  • 122737.
    Yang, Dekun
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Investigation of a new integration test environment: Facilitating offline debugging of Hardware-in-the-Loop2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Advanced automatic testing is very important in development and research within the vehicle industry. Hardware-in-the-loop (HIL) systems give the ability to validate Electronic Control Units (ECUs) based on software simulation without gathering all of the physical hardware. This enables testing by providing inputs and examining the corresponding outputs of the ECUs in a simpler and safer way than in traditional physical testing. HIL offers the advantage that we can verify and validate the functions of ECUs prior to full-scale hardware production.

    On the contrary, because HIL systems are normally released as general-purpose test beds, it takes time to embed them into the current system. Additionally, the question of how to fill the gap between the HIL and the test environment is even more critical when the test bed is expected to be used for a long period of time without modifications. Furthermore, HIL systems are precious. It is not practical and will be considered as a waste of resource if it is used exclusively by testers. Scania’s RESI group uses Client-Server architecture to make it more flexible. The HIL system is hosted at server side while the testers operate it at client side. This architecture enables different implementations of client and server as long as a same protocol is applied, but this still does not solve the problem that the HIL is not always accessible when the testers want to debug their scripts. The testers want to find a solution to achieve this goal offline (without servers).

    To solve the problem, we first investigated which programming languages are used in the industry. Without doubt, there is no dominant language that ideally suits all situations, so secondly, we developed a new test environment. The new environment including “Dummy Mode” and “Mat Mode” is able to provide script validation service on basic and logic levels without servers. The result shows the Dummy mode is able to reach a higher detection rate (99.3%) on simple errors comparing to the current environment (81.3%). By reproducing and reusing the result of HIL system, Mat mode is able to identify logic errors and provide better assistance when the logic errors are found. In general, the proposed environment is able to show a better way of using HIL which makes the whole system more efficient and productive.

  • 122738.
    Yang, Fan
    KTH, School of Electrical Engineering (EES), Communication Theory.
    Integral Video Coding2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In recent years, 3D camera products and prototypes based on Integral imaging (II) technique have gradually emerged and gained broad attention. II is a method that spatially samples the natural light (light field) of a scene, usually using a microlens array or a camera array and records the light field using a high resolution 2D image sensor. The large amount of data generated by II and the redundancy it contains together lead to the need for an efficient compression scheme. During recent years, the compression of 3D integral images has been widely researched. Nevertheless, there have not been many approaches proposed regarding the compression of integral videos (IVs).

    The objective of the thesis is to investigate efficient coding methods for integral videos. The integral video frames used are captured by the first consumer used light field camera Lytro. One of the coding methods is to encode the video data directly by an H.265/HEVC encoder. In other coding schemes the integral video is first converted to an array of sub-videos with different view perspectives. The sub-videos are then encoded either independently or following a specific reference picture pattern which uses a MVHEVC encoder. In this way the redundancy between the multi-view videos is utilized instead of the original elemental images. Moreover, by varying the pattern of the subvideo input array and the number of inter-layer reference pictures, the coding performance can be further improved. Considering the intrinsic properties of the input video sequences, a QP-per-layer scheme is also proposed in this thesis. Though more studies would be required regarding time and complexity constraints for real-time applications as well as dramatic increase of number of views, the methods proposed inthis thesis prove to be an efficient compression for integral videos.

  • 122739.
    Yang, Fan
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Environmental Strategies Research (fms).
    The research of long-term haze pollution in Shanghai, China: Analysis, Plans and Scenarios2014Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    With the rapid development of the social economy, the industrialization and urbanization process is accelerating, and the harm of serious environmental pollution has become increasingly evident. Among them, the atmosphere as the essential factor for human survival, has been a threat to survive and healthy of humans and other organisms. And the pollution sources have the diversity and specificity. This paper analyzes the causes of the formation of Shanghai haze pollution, as well as the characteristics and sources of major PM2.5 components. According to the analysis, point out that the adverse weather conditions is the culprit for the formation of haze pollution, and air pollutants are the accomplices. Base on the specific nature of pollution sources and regional particularity, to develop a strategic plan for Shanghai haze governance.

    To optimize and maintain the urban environment, it requires the city government to develop scientific plans for the controlling of economy and key sources of pollution. Urban residents also need to consciously participate into the environmental protection work, advocating green and low-carbon life, and friendly living and travel habits. Overall, the Shanghai government should make a good job in green environmental protection from the details. 

  • 122740.
    Yang, Fan
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Environmental Strategies Research (fms).
    The research of long-term haze pollution in Shanghai, China: Analysis, Plans and Scenarios2014Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    With the rapid development of the social economy, the industrialization and urbanization process is accelerating, and the harm of serious environmental pollution has become increasingly evident. Among them, the atmosphere as the essential factor for human survival, has been a threat to survive and healthy of humans and other organisms. And the pollution sources have the diversity and specificity. This paper analyzes the causes of the formation of Shanghai haze pollution, as well as the characteristics and sources of major PM2.5 components. According to the analysis, point out that the adverse weather conditions is the culprit for the formation of haze pollution, and air pollutants are the accomplices. Base on the specific nature of pollution sources and regional particularity, to develop a strategic plan for Shanghai haze governance.

    To optimize and maintain the urban environment, it requires the city government to develop scientific plans for the controlling of economy and key sources of pollution. Urban residents also need to consciously participate into the environmental protection work, advocating green and low-carbon life, and friendly living and travel habits. Overall, the Shanghai government should make a good job in green environmental protection from the details. 

  • 122741.
    Yang, Fangkai
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Numerical Analysis, NA.
    Collision Detection between Dynamic Rigid Objects and Static Displacement Mapped Surfaces in Computer Games2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Collision detection often refers the detection of the intersection of two or more objects. Collision detection algorithms in Avalanche Studios’ game engine need not only to detect the collision, but to get the closest distance and handle penetration. Current algorithms perform well in most cases, but obtain poor accuracy or low efficiency in some cases. This paper will attempt to improve the performance in two ways. First, two new backward projection methods are derived and compared, achieving more accurate backwards projected points. The accurate backwards points are important in collision detection with the terrain surface. Second, multiresolution bounding volumes are constructed in the narrow phase collision detection. These bounding volumes improve the performance when performing collision detection between large complex objects and the terrain. These bounding volumes reduces the number of backward projections needed.

  • 122742.
    Yang, Fangkai
    et al.
    KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
    Li, Chengjie
    KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
    Palmberg, Robin
    KTH, School of Computer Science and Communication (CSC).
    Van der Heide, Ewoud
    KTH, School of Computer Science and Communication (CSC).
    Peters, Christopher
    KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
    Expressive Virtual Characters for Social Demonstration Games2017In: 2017 9th International Conference on Virtual Worlds and Games for Serious Applications, VS-Games 2017 - Proceedings, IEEE, 2017, p. 217-224Conference paper (Refereed)
    Abstract [en]

    Virtual characters are an integral part of many game and learning environments and have practical applications as tutors, demonstrators or even representations of the user. However, creating virtual character behaviors can be a time-consuming and complex task requiring substantial technical expertise. To accelerate and better enable the use of virtual characters in social games, we present a virtual character behavior toolkit for the development of expressive virtual characters. It is a midlleware toolkit which sits on top of the game engine with a focus on providing high-level character behaviors to quickly create social games. The toolkit can be adapted to a wide range of scenarios related to social interactions with individuals and groups at multiple distances in the virtual environment and supports customization and control of facial expressions, body animations and group formations. We describe the design of the toolkit, providing an examplar of a small game that is being created with it and our intended future work on the system.

  • 122743.
    Yang, Fangkai
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
    Qureshi, A.
    Shabo, Jack
    KTH.
    Peters, Christopher
    KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
    Do you see groups?: The impact of crowd density and viewpoint on the perception of groups2018In: Proceedings of the 18th International Conference on Intelligent Virtual Agents, IVA 2018, Association for Computing Machinery (ACM), 2018, p. 313-318Conference paper (Refereed)
    Abstract [en]

    Agent-based crowd simulation in virtual environments is of great utility in a variety of domains, from the entertainment industry to serious applications including mobile robots and swarms. Many studies of crowd behavior simulations do not consider the fact that people tend to congregate in smaller social gatherings, such as friends, or families, rather than walking alone. Based on a real-time crowd simulator which has been implemented as a unilateral incompressible fluid and augmented with group behaviors, a perceptual study was conducted to determine the impact of groups on the perception of the crowds at various densities from different camera views. If it is not possible to see groups under certain circumstances, then it may not be necessary to simulate them, to reduce the amount of calculations, an important issue in real-time simulations. This study provides researchers with a proper reference to design better algorithms to simulate realistic behaviors.

  • 122744.
    Yang, Fangkai
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
    Saikia, Himangshu
    KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
    Peters, Christopher E.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology (CST).
    Who are my neighbors?: A perception model for selecting neighbors of pedestrians in crowds2018In: Proceedings of the 18th International Conference on Intelligent Virtual Agents, IVA 2018, Association for Computing Machinery (ACM), 2018, p. 269-274Conference paper (Refereed)
    Abstract [en]

    Pedestrian trajectory prediction is a challenging problem. One of the aspects that makes it so challenging is the fact that the future positions of an agent are not only determined by its previous positions, but also by the interaction of the agent with its neighbors. Previous methods, like Social Attention have considered the interactions with all agents as neighbors. However, this ends up assigning high attention weights to agents who are far away from the queried agent and/or moving in the opposite direction, even though, such agents might have little to no impact on the queried agent’s trajectory. Furthermore, trajectory prediction of a queried agent involving all agents in a large crowded scenario is not efficient. In this paper, we propose a novel approach for selecting neighbors of an agent by modeling its perception as a combination of a location and a locomotion model. We demonstrate the performance of our method by comparing it with the existing state-of-the-art method on publicly available data-sets. The results show that our neighbor selection model overall improves the accuracy of trajectory prediction and enables prediction in scenarios with large numbers of agents in which other methods do not scale well.

  • 122745. Yang, Fengmei
    et al.
    Sun, Weiwei
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Uppsala University, Sweden .
    Li, Yuhan
    Yuan, Haiyan
    Dong, Zhiyong
    Li, Huanhuan
    Tian, Jumei
    Zheng, Yiying
    Zhang, Jingping
    Li2FePO4F and its metal-doping for Li-ion batteries: an ab initio study2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 91, p. 50195-50201Article in journal (Refereed)
    Abstract [en]

    The electrochemical properties of three isotopic Li2FePO4F compounds, as cathode materials under different space groups Pbcn, P (1) over bar and Pnma were investigated using first principle calculations. Their structures and average open circuit voltages for step delithiation reactions were explored, and the results are in good agreement with the reported experimental data. We estimate the substitution effect of Fe by Co in Pnma-Li2FePO4F. The substitution of Fe by Co in Li2Fe1-xCoxPO4F may enhance the discharge potential of the materials, and the rate of its volume change during the redox process is between 0.6% and 2.1%. Furthermore, from the projected density of states for Li2Fe0.5Co0.5PO4F, we found strong hybridization for Fe-3d and Co-3d bands near the Fermi level, which implies that the Co-doped Li2Fe1-xCoxPO4F may possess better electronic conductivity than the pure phase.

  • 122746. Yang, G.
    et al.
    Nilsson, Fritjof
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Schubert, D. W.
    Universal and anisotropic simulation platform for the study of electrical properties of conductive polymer composites2019In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2055, article id 050012Conference paper (Refereed)
    Abstract [en]

    In order to carry out a study on the synergistic relationship of variables which could affect the electrical properties of CPC, a universal and anisotropic platform of simulation, containing three simulation modules are explored. The simulation modules are: finite element modelling (FEM), percolation threshold modeling (PTM) and electrical networks modelling (ENM).

  • 122747.
    Yang, Gang
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Traffic and Logistics.
    Shared space for unregulated traveller interactions.2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Shared space is that “all street users move and interact in their use of space on the

    basis of informal social protocols and negotiations” (Hamilton-Baillie 2008). By

    minimizing demarcations, the dominance of motor vehicles reduces and it enables

    all users to share the space. As a result, drivers and cyclists have to reduce their

    speed, pedestrians watch more carefully to surroundings traffic. The purpose of

    shared space is to improve the road safety and build a pedestrian priority

    environment.

    But there are also concerns about the shared space safety. Since the roads are

    unregulated, they may become more dangerous to some pedestrians. The

    vulnerable pedestrians and designs have to be identified.

    This thesis explores the factors of shared space users and shared space itself to see if

    they will be potential dangers to the traffic. The case study focuses on two shared

    spaces in Stockholm city involving both residential area and famous tour site.

    The result shows that factors like gender, age, and partners do have different effects

    on traffic safety issues in shared space zones. But some factors like vehicle type,

    vehicle speed are not shown much difference in shared space zones. The thesis study

    gives detailed conclusions of the factors that can affect the shared space safety and

    suggestions on a shared space should be designed.

  • 122748.
    Yang, Geng
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Cao, Ying
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Chen, Jian
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Zheng, Li-Rong
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    An Active-Cable Connected ECG Monitoring System for Ubiquitous Healthcare2008In: THIRD 2008 INTERNATIONAL CONFERENCE ON CONVERGENCE AND HYBRID INFORMATION TECHNOLOGY, VOL 1, PROCEEDINGS, IEEE Press, 2008, p. 392-397Conference paper (Refereed)
    Abstract [en]

    In this paper, novel microchip architecture for a "smart electronic electrode" has been proposed Furthermore, a new concept for wearable electrocardiography (ECG) monitoring system especially designed for ubiquitous healthcare is described. The patient can wear single Active-Cable connected smart electronic electrodes with wireless transmission of ECG signals to a dedicated Personal Health Assistant (PHA). The system will act as a continuous ECG data and event recorder, which can be used to follow up patients who have survived cardiac arrest or ventricular tachycardia but also for diagnostic purposes for patients with chronic diseases. A microchip prototype for the smart electronic electrode is implemented using UMC 0.18um process. The post-layout simulation results show that the smart electronic electrode with ultra low power consumption is quite feasible for a hand-held PHA which uses a battery as energy source.

  • 122749.
    Yang, Geng
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Chen, Jian
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Cao, Ying
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Zheng, Li-Rong
    KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK. KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    A Novel Wearable ECG Monitoring System Based on Active-Cable and Intelligent Electrodes2008In: 2008 10TH IEEE International Conference On E-Health Networking, Applications And Services, IEEE conference proceedings, 2008, p. 156-159Conference paper (Refereed)
    Abstract [en]

    In this paper, a novel wearable electrocardiograph (ECG) monitoring system is presented. Unlike most of the existing holter monitors that are composed of conventional electrodes and multiple cables, the ECG monitoring system proposed here consists of intelligent electrodes and one single Active-Cable. A prototype of a wearable ECG monitoring system is developed and implemented on Xilinx FPGAs. The experimental results show that a reliable performance with high-quality ECG data can be achieved using this novel ECG monitoring system.

  • 122750.
    Yang, Geng
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Chen, Jian
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Jonsson, Fredrik
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Zheng, Li-Rong
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    A 1.0 V 78 uW reconfigurable ASIC embedded in an intelligent electrode for continuous remote ECG applications2009In: EMBC: 2009 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-20, 2009, p. 2316-2319Conference paper (Refereed)
    Abstract [en]

    In this paper, a reconfigurable, low-power Application Specific Integrated Circuit (ASIC) that extracts and transmits electrocardiograph (ECG) signals is presented. An intelligent electrode is introduced which consists of the proposed ASIC and a micro spike array, permitting onsite ECG signal acquisition, processing and transmission. Fabricated in a standard 0.18 mum CMOS process, the ASIC consumes 78 muW with 1.0 V core voltage at 6 MHz operating frequency and only occupies 2.25 mm2. The tiny silicon size makes it possible and suitable to embed the proposed ASIC into an intelligent electrode, and the low power consumption makes it feasible for long term continuous ECG monitoring.

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