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  • 122001.
    Yavuz, Emre A.
    et al.
    KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Karlsson, Gunnar
    KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Poster: Collective Mobile Sensing for Wireless Network Performance Monitoring2011In: Proc. ACM Annual International Conference on Mobile Systems, Applications and Services, 2011, p. 411-Conference paper (Refereed)
    Abstract [en]

    Rapid growth of mobile wireless industry has generated numerous challenges for service operators. The provisioning of increasing demand in capacity and higher quality of service can be met with redimensioning of networks which makes a priori network planning difficult. We propose a network performance monitoring system to which all mobile devices contribute by voluntarily submitting periodical reports on the availability and quality of network access that they experience at their current geographical locations. Network performance measures such as signal strength, coverage, call block/drop statistics and operator service capabilities are reported to a server with a network status information database as experienced by mobile devices. The proposed database will indicate areas with lack of coverage, insufficient capacity, and high interference, which may serve as cues for operators to upgrade/retune their infrastructure equipment and for regulators to take action against operators that do not fulfill commitments made to their subscribers.

  • 122002.
    Yavuz, Emre A.
    et al.
    Dept. of Electrical & Computer Engineering - University of British Columbia (UBC).
    Leung, Victor C. M.
    A practical method for estimating performance metrics of call admission control schemes in wireless mobile networks2005In: 2005 IEEE Wireless Communications and Networking Conference, Vols 1-4: WCNC 2005: BROADBAND WIRELESS FOR THE MASSES READY FOR TAKE-OFF, 2005, Vol. 2, p. 1254-1259Conference paper (Refereed)
    Abstract [en]

    Providing the desired call blocking probability to not only new but also existing calls has been a challenge for wireless mobile network service providers. To satisfy different requirements for new and handoff call blocking probabilities, several call admission control (CAC) schemes have been proposed in the literature. Exact analysis of these schemes using two dimensional Markov chain is computationally intensive. Therefore under specific assumptions computationally efficient methods to analyze these systems using one dimensional Markov chain models have been considered. The "traditional" approach assumes that channel holding time for new and handoff calls have equal mean values. While the "normalized" approach relaxes this assumption, it is accurate only for the new call bounding CAC scheme. In this paper, we reevaluate the analytical methods for computing call blocking probabilities for several widely known call admission control schemes under more general assumptions by providing an easy to implement method. The numerical results show that when the average values of channel holding times for new and handoff calls are different, the proposed approach gives more accurate results when compared with the traditional and normalized methods based on one dimensional Markov chain modeling, while keeping the computational complexity low.

  • 122003.
    Yavuz, Emre A.
    et al.
    Dept. of Electrical & Computer Engineering - University of British Columbia (UBC).
    Leung, Victor C. M.
    Computationally efficient method to evaluate the performance of guard-channel-based call admission control in cellular networks2006In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 55, no 4, p. 1412-1424Article in journal (Refereed)
    Abstract [en]

    Many guard-channel-based call admission control (CAC) schemes for cellular networks have been proposed to provide the desired quality of service to not only new calls but also ongoing calls when they hand off to neighboring cells. Blocking/dropping probabilities of new/handoff calls are generally analyzed using one-dimensional Markov chain modeling under specific assumptions to avoid solving large sets of flow equations that makes exact analyses of these schemes using multidimensional Markov chain models infeasible. This is the case with the "traditional" approach, which assumes that channel holding times for new and handoff calls have equal mean values, and the "normalized" approach, which relaxes this assumption but is accurate only for the new call bounding CAC scheme. In this paper, we reevaluate the analytical methods for computing new/handoff call blocking/dropping probabilities for several widely known CAC schemes and develop an easy-to-implement method under more general assumptions. Numerical results show that when the mean channel holding times for new and handoff calls are different, the proposed "effective holding time" approach gives more accurate results compared with the traditional and the normalized methods while keeping the computational complexity low. The accuracy of these methods and their levels of computational complexity with the exact solution are also compared.

  • 122004.
    Yavuz, Emre A.
    et al.
    Dept. of Electrical & Computer Engineering - University of British Columbia (UBC).
    Leung, Victor C. M.
    Efficient approximations for call admission control performance evaluations in multi-service networks2006In: GLOBECOM 2006: 2006 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, 2006, Vol. WLC40-5Conference paper (Refereed)
    Abstract [en]

    Several dynamic call admission control (CAC) schemes for cellular networks have been proposed in the literature to reserve resources adaptively to provide the desired quality of service (QoS) to not only high priority calls but also to low priority ones. Efficient adaptive reservations depend on reliable and up-to-date system status feedback provided to the CAC mechanism. However exact analysis of these schemes using multidimensional Markov chain models are intractable in real time due to the need to solve large sets of flow equations. Hence performance metrics such as call blocking probabilities of various QoS classes are generally evaluated using one dimensional Markov chain models assuming that channel occupancy times for all QoS classes have equal mean values and all arriving calls have equal capacity requirements. In this paper we re-evaluate the analytical methods to compute call blocking probabilities of various QoS classes for several widely known CAC schemes by relaxing these assumptions, and propose a novel approximation method for performance evaluation with low computational complexity. Numerical results show that proposed method provides results that match well with the exact solutions.

  • 122005.
    Yavuz, Emre A.
    et al.
    Dept. of Electrical & Computer Engineering - University of British Columbia (UBC).
    Leung, Victor C. M.
    Efficient Methods for Performance Evaluations of Call Admission Control Schemes in Multi-Service Cellular Networks2008In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 7, no 9, p. 3468-3476Article in journal (Refereed)
    Abstract [en]

    Many dynamic call admission control (CAC) schemes have been proposed in the literature for adaptive reservations in cellular networks. Efficient application of these schemes requires reliable and up-to-date feedback of system performance to the CAC mechanism. However, exact analyses of these schemes in real time using multi-dimensional Markov chain models are challenging due to the need to solve large sets of flow equations. One dimensional Markov chain models have been widely used to derive performance metrics such as call blocking probabilities of multiple traffic classes assuming that all classes of calls have equal capacity requirements and exponentially distributed channel holding times with equal mean values. These assumptions need to be relaxed for a more general evaluation of CAC performance in multi-service cellular networks. In this paper we classify CAC schemes according to their Markov chain models into two categories: symmetric and asymmetric, and develop computationally efficient analytical methods to compute call blocking probabilities of various traffic classes for several widely known CAC schemes under relaxed assumptions. We obtain a product form solution to evaluate symmetric schemes and propose a novel performance evaluation approximation method with low computational cost for asymmetric schemes. Numerical results demonstrate the accuracy and efficiency of the proposed method.

  • 122006.
    Yavuz, Emre A.
    et al.
    Dept. of Electrical & Computer Engineering - University of British Columbia (UBC).
    Leung, Victor C. M.
    Modelling channel occupancy times for voice traffic in cellular networks2007In: 2007 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-14, 2007, p. 332-337Conference paper (Refereed)
    Abstract [en]

    Call holding times in telephony networks are commonly approximated by exponential distributions to facilitate traffic engineering. However, for traffic engineering of cellular networks, channel occupancy times need to be modeled instead to facilitate analytical modeling or to feed network simulations. In this paper, we classify channel occupancy times and present an empirical study based on data obtained from a real cellular network to determine which probability distribution functions can approximate them better. The results are environment dependent, but no assumptions that can be influential are made, as opposed to previous analytical and simulation studies which results are highly dependent on the assumptions made by the authors. We show that all types of channel occupancy times can be approximated by lognormal distribution. For stationary users, channel occupancy times are commonly approximated by exponential distribution due to its tractability, assuming that cell residence times are also exponentially distributed. However, we show that lognormal distribution fits much better to both channel occupancy and call holding times regardless of whether users are stationary or mobile.

  • 122007.
    Yavén, María Carolina
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Implementation methodology for Activity Based Costing: a case study in the telecommunication sector2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122008.
    Yayo, Johannes
    KTH, School of Biotechnology (BIO).
    Growth of Clostridium thermocellum on glucose and fructose2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122009.
    Yazdani, Ghasem
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Transport och dess miljöpåverkan: Godstransport från FMCL i Arboga till skolor och staber2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 122010.
    Yazdani, Niloofar
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Ekasriouen, Samir
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Försöksmetod för automatisering av kvalitetssäkring av SKB2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Within all industries, there is a change in working time required; this also includes the construction sector. However, the way construction sectors are differentiated is by not having been given the opportunity to be practiced or tested.  The aim of this thesis that we have done in collaboration with the Concrete Industry was to investigate the possibility of developing an automated method for quality assurance of SKB at the site. The idea is to make the O-funnel to be more utilized and therefore ensuring that the appropriate concrete quality is provided which eventually would lead to a better development in the production process.

    The project has involved theoretical work and laboratory experiments. The theoretical work gave us a good foundation at the beginning of the project. After gathering the information and material, the laboratory experiments began by SCC in their laboratory in Hammarby. The collected data from the various laboratory tests formed the foundation for trying to relate measurements for consistency of SCC with each other and therefore find out how measurements from O-funnel varies with different concrete mixtures. A big part of the work was performed in the laboratory where the test methods T50, slump flow, and O-funnel were used. These measurement methods would give us concrete viscosity and slump flow, and correlation between these parameters.

    The result of these tests showed that the O-funnel is not consistent with the theory.O-funnel showed a clear respond with the separation in the concrete. In this case, the concrete was stocked in the O-funnel or was constantly giving very high outflow times.  However, if the concrete is too stiff, the O-funnel can give false values. O-funnel does not capture variations of floating-way measurements well enough but it does describe the viscosity of the best, meaning the T50-value. It is difficult to say what this was dependent on but one reason may be that the recipe from the first part gave very low T50 values.

     

  • 122011.
    Yazdi, Milad Ghadami
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ivanic, M.
    Rudjer Boskovic Inst, Div Marine & Environm Res, Zagreb, Croatia..
    Mohamed, Alaa
    Cairo Univ, Egypt Nanotechnol Ctr, EGNC, 6Th October City 12588, Egypt.;Karlsruhe Inst Technol, Inst Funct Interfaces IFG, Membrane Technol Dept, D-76344 Karlsruhe, Germany.;Akhbar El Yom Acad, Prod Engn & Printing Technol Dept, Giza 12655, Egypt..
    Uheida, Abdusalam
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Surface modified composite nanofibers for the removal of indigo carmine dye from polluted water2018In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 8, no 43, p. 24588-24598Article in journal (Refereed)
    Abstract [en]

    Surface coated magnetite nanoparticles (Fe3O4 NPs) with 3-mercaptopropionic acid were immobilized on amidoximated polyacrilonitrile (APAN) nanofibers using electrospinning followed by crosslinking. The prepared composite nanofibers were characterized with Scanning Electron Microscopy (SEM), and Fourier Transform Infrared analysis (FTIR). The composite nanofiber was evaluated for the removal of indigo carmine dye from aqueous solutions. The effects of contact time, initial dye concentration, solution pH and adsorption equilibrium isotherms were studied. The adsorption of indigo carmine was found to be greatly affected by solution pH. The maximum loading capacity was determined to be 154.5 mg g(-1) at pH = 5. The experimental kinetic data were fitted well using a pseudo-first order model. The adsorption isotherm studies showed that the adsorption of indigo carmine fits well with the Langmuir model. The reuse of the composite nanofiber was also investigated in which more than 90% of indigo carmine was recovered in 5 min. The results of stability studies showed that the adsorption efficiency can remain almost constant (90%) after five consecutive adsorption/desorption cycles.

  • 122012.
    Yazdi, Mohammad Hamed
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Software Test Strategies for the RNC RNH Subsystem2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This work concerns software testing strategies for the Radio Network Controller (RNC) RadioNetwork Handler (RNH) subsystem at the WCDMA development department at Ericsson AB. Due to the rapid development in the area of radio communication It is crucial to constantly develop and deliver new software components without errors in the code, which has to be tested and proved to work on a regular basis. Since development teams are working in parallel, one cannot uphold another team for long periods for testing purposes. It should be easy and straightforward to implement and maintain RNH tests. The main goal is to propose the best way of software testing for the RNH subsystem with respect to the agile way of working.

    In the first part of this work an investigation of the RNH software was done. This was to define a template for code classification. The aim of the classification is to identify a smallest testable unit for different testing levels. The data classes were considered as smallest testable unit for testing on low level. In the second part, unit test was deployed to two different blocks to evaluate unit testing and prove testability of data classes on a low level. In addition, the automated regression test framework was evaluated with respect to node level testing performance. In the third part, unit test was evaluated in comparison to the current testing level at RNH.

    The major result of this investigation shows all testing levels are required for the RNH subsystem, because each level focuses on a specific area of software testing. Furthermore, unit testing is recommended to be a permanent testing level at RNH subsystem, since unit testing is promoted by agile testing strategies (test as early as possible). Besides, when more detailed test on low level (unit testing) is applied, it may lead to the less testing effort on higher level.

  • 122013. Yazdi, Samira
    et al.
    Stein, Matthias
    Elinder, Fredrik
    Andersson, Magnus
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics.
    Lindahl, Erik
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. Stockholms universitet, Sweden.
    The Molecular Basis of Polyunsaturated Fatty Acid Interactions with the Shaker Voltage-Gated Potassium Channel2016In: PloS Computational Biology, ISSN 1553-734X, E-ISSN 1553-7358, Vol. 12, no 1, article id e1004704Article in journal (Refereed)
    Abstract [en]

    Voltage-gated potassium (K-V) channels are membrane proteins that respond to changes in membrane potential by enabling K+ ion flux across the membrane. Polyunsaturated fatty acids (PUFAs) induce channel opening by modulating the voltage-sensitivity, which can provide effective treatment against refractory epilepsy by means of a ketogenic diet. While PUFAs have been reported to influence the gating mechanism by electrostatic interactions to the voltage-sensor domain (VSD), the exact PUFA-protein interactions are still elusive. In this study, we report on the interactions between the Shaker K-V channel in open and closed states and a PUFA-enriched lipid bilayer using microsecond molecular dynamics simulations. We determined a putative PUFA binding site in the open state of the channel located at the protein-lipid interface in the vicinity of the extracellular halves of the S3 and S4 helices of the VSD. In particular, the lipophilic PUFA tail covered a wide range of non-specific hydrophobic interactions in the hydrophobic central core of the protein-lipid interface, while the carboxylic head group displayed more specific interactions to polar/charged residues at the extracellular regions of the S3 and S4 helices, encompassing the S3-S4 linker. Moreover, by studying the interactions between saturated fatty acids (SFA) and the Shaker K-V channel, our study confirmed an increased conformational flexibility in the polyunsaturated carbon tails compared to saturated carbon chains, which may explain the specificity of PUFA action on channel proteins.

  • 122014. Yazdi, Sammy
    et al.
    Andersson, Magnus
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Elinder, Fredrik
    Stein, Matthias
    Lindahl, Erik
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical & Computational Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Molecular Characterization of the Binding of Polyunsaturated Fatty Acids to a Voltage-Gated Potassium Channel2014In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 106, no 2, p. 739A-739AArticle in journal (Other academic)
  • 122015.
    Yberg, Viktor
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Native-like Performance and User Experience with Progressive Web Apps2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Users spend more time than ever on mobile devices like smartphones and tablets, while native app development continues to become harder due to platform fragmentation. The web is a promising platform for mobile applications because of its easy access and standardised technologies that work unanimously across many different platforms and operating systems. However, native applications have always had an edge over the web because of important features that have not been available anywhere else, such as push notifications, background synchronisation and offline support. Progressive Web Apps aim to bring the web platform closer to native by enabling many of these important features while still running completely in the web browser, with the possibility to install the application, effectively promoting it to a top-level application.

    This project will evaluate the capabilities of web-based mobile applications compared to traditional native mobile applications. Three simple proof of concept applications will be built to test the performance and user experience with the help of different JavaScript libraries and techniques for building a Progressive Web App. Then one of the implementations will be further developed and matched against an existing native application with similar features in terms of functionality and performance.

    The study finds that for this use case, a Progressive Web App may be used instead of a native app without missing out on any important functionality. This simplifies development and releases, by enabling rich code sharing between the different platforms as well as avoiding the app distribution platforms by distributing the application entirely through the web, automatic and transparent to the users. However, this solution means more responsibility in terms of infrastructure for developers to maintain and optimise as the application needs to be distributed by own servers.

  • 122016.
    Ydrefors, Emanuel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. University of Jyväskylä, Finland .
    Almosly, W.
    Suhonen, J.
    Neutrino-nucleus scattering of 95,97 Mo and 116 Cd2013In: Workshop on Calculation of Double-Beta-Decay Matrix Elements (MEDEX 2013), 2013, Vol. 1572, p. 118-121Conference paper (Refereed)
    Abstract [en]

    Accurate knowledge about the nuclear responses to supernova neutrinos for relevant nuclear targets is important both for neutrino detection and for astrophysical applications. In this paper we discuss the cross sections for the charged-current neutrino-nucleus scatterings off Mo-95,Mo-97 and Cd-116. The microscopic quasiparticle-phonon model is adopted for the odd-even nuclei Mo-95,Mo-97. In the case of Cd-116 we present cross sections both for the Bonn one-boson-exchange potential and self-consistent calculations based on modern Skyrme interactions.

  • 122017. Ydstie, B.E.
    et al.
    Wahlberg, Bo
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Iterative refinement of model predictive control1994In: IFAC ADCHEM94, 1994Conference paper (Refereed)
  • 122018. Ydstie, B-E.
    et al.
    Wahlberg, Bo
    KTH, Superseded Departments, Signals, Sensors and Systems.
    On adaptive/iterative robust control1996In: IFAC World Congress, 1996Conference paper (Refereed)
  • 122019.
    Ye, Brian
    KTH, School of Computer Science and Communication (CSC).
    An Evaluation on Using Coarse-grained Events in an Event Sourcing Context and its Effects Compared to Fine-grained Events2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introducing event sourcing to a system that is based on a model following Create, Read, Update and Delete (CRUD) operations can be a challenging task and requires an extensive rework of the current system. By introducing coarse-grained events it is possible to persist the structure of the data in a CRUD model and still gain the benefits of event sourcing, avoiding an extensive rework of the system. This thesis investigates how large amounts of data can be handled with coarse-grained events and still gain the benefits of event sourcing, by comparing with the conventional way of using fine-grained events. The data to be examined is trade data fed into a data warehouse.

    Based on research, an event sourcing application is implemented for coarse-grained as well as fine-grained events, to measure the difference between the two event types. The difference is limited to the metrics, latency and size of storage. The application is verified with an error handler, using example data and a profiler to make sure that it does not have any unnecessary bottlenecks.

    The resulting performance of the two cases show that fine-grained events have excessively larger latency than coarse-grained events in most cases whereas the size of storage is strictly smaller for fine-grained events.

  • 122020.
    Ye, Brian
    et al.
    KTH, School of Computer Science and Communication (CSC).
    Tieu, Benny
    KTH, School of Computer Science and Communication (CSC).
    Implementation and Evaluation of a Recommender System Based on the Slope One and the Weighted Slope One Algorithm2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recommender systems are used on many different websites today and are mechanisms that are supposed to accurately give personalized recommendations of items to a set of different users. An item can for example be movies on Netflix. The purpose of this paper is to implement an algorithm that fulfills five stated goals of the implementation. The goals are as followed: the algorithm should be easy to implement, be effective on query time, accurate on recommendations, put little expectations on users and alternations of algorithm should not have to be changed comprehensively. Slope One is a simplified version of linear regression and can be used to recommend items. By using the Netflix Prize data set from 2009 and the Root-Mean-Square-Error (RMSE) as an evaluator, Slope One generates an accuracy of 1.007 units. The Weighted Slope One, which takes the relevancy of items into the calculation, generates an accuracy of 0.990 units.  Adding Weighted Slope One to the Slope One implementation can be done without changing the fundamentals of the Slope One algorithm. It is nearly instantaneous to generate a recommendation of a movie with regular Slope One and Weighted Slope One. However, a precomputing stage is needed for the mechanism. In order to receive a recommendation of the implementation in this paper, the user must at least have rated two items.

  • 122021. Ye, C.
    et al.
    Zhang, L.
    Zhu, M.
    Yu, J.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Chang, G. -K
    A 60GHz wireless access scheme with electrical LO devices free in mobile terminals and base stations2012In: 2012 Asia Communications And Photonics Conference (ACP), IEEE , 2012, p. ATh2C.6-Conference paper (Refereed)
    Abstract [en]

    we propose a 60GHz wireless access network scheme with centralized LO service delivered to mobile terminals and base stations from the central office. Bidirectional transmission based on the scheme has been experimentally demonstrated.

  • 122022. Ye, Chenhui
    et al.
    Fu, Hongyan
    Zhu, Kun
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang University, China.
    All-Optical Approach to Microwave Frequency Measurement With Large Spectral Range and High Accuracy2012In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 24, no 7, p. 614-616Article in journal (Refereed)
    Abstract [en]

    An all-optical approach for microwave frequency (MWF) measurement with a low-speed oscilloscope is proposed and experimentally demonstrated. In this scheme, an optical filter with a single and ultranarrow passband, together with a tunable laser and a low-speed photodiode is utilized to calculate the MWF by measuring the time delay between the sweeping optical carrier and its upper/lower sideband passing through the filter. Single-frequency and multifrequency measurements are experimentally demonstrated. The measurement recognition, accuracy, and resolution are below 0.1, 0.09, and 0.2 GHz, respectively. This proposed scheme can be easily upgraded to higher frequencies using a modulator with higher bandwidth proportional to the desired measurement range.

  • 122023. Ye, Chenhui
    et al.
    Zhu, Kun
    Fu, Hongyan
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    An All-Optical Transformer From Differential NRZ Data to Ultra-Wideband Pulse Stream2011In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 23, no 9, p. 579-581Article in journal (Refereed)
    Abstract [en]

    We propose and experimentally demonstrate a compact and cost-effective scheme based on a fiber Sagnac structure to realize real time conversion from differential nonreturn-to-zero (NRZ) data to ultra-wideband (UWB) pulse stream. The proposed conversion system for the UWB signal generation consists of a single-wavelength laser, a phase modulator, several polarization controllers, and optical couplers. Due to the optical interference between the two phase-modulated light waves with slight phase difference in the Sagnac loop, two sharp optical pulses with opposite polarities are obtained. With proper time delay, a UWB monocycle pulse stream is generated from the original differential NRZ data. Our proposed method gives a reliable, easy, and low-cost transformer from differential NRZ signal to UWB pulse stream, and no high-speed arbitrary waveform generator (AWG) is required in this all-optical transformer.

  • 122024. Ye, Chen-Qing
    et al.
    Hu, Rong-Gang
    Dong, Shi-Gang
    Zhang, Xiao-Juan
    Hou, Rui-Qing
    Du, Rong-Gui
    Lin, Chang-Jian
    Pan, Jin-Shan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    EIS analysis on chloride-induced corrosion behavior of reinforcement steel in simulated carbonated concrete pore solutions2013In: Journal of Electroanalytical Chemistry, ISSN 1572-6657, Vol. 688, p. 275-281Article in journal (Refereed)
    Abstract [en]

    The corrosion behavior of reinforcement steel in simulated carbonated concrete pore (SCCP) solution containing different concentrations of chloride was studied by electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) measurements simultaneously, and the topographies of the steel specimens and the elemental distribution at corrosion area were examined by scanning electron microscope (SEM)/electron microprobe analysis (EMPA). The results showed the capacitive loop and polarization resistance decreased with chloride increasing. Furthermore, when the chloride concentration reached a critical value, the Bode plots obviously exhibited two phase angle peaks indicating two time constants. However, when the chloride content exceeded a critical value, the phase angle peaks decreased to one phenomenal peak. An equivalent circuit with two RC loops was used to characterize the corrosion behavior of reinforcement steel in SCCP solution according to the measurements of EIS. Based on the dependence of the equivalent circuit elements on chloride content and immersion time, the formation, growth and breakdown of passive film of the steel were discussed. It was found that the EIS evaluation of corrosion behavior for reinforcement steel in SCCP solution was good agreement with the LPR and SEM measurements. The EMPA mapping revealed MnS inclusions at steel surface play a leading role in the initiation of pitting corrosion.

  • 122025. Ye, Chen-Qing
    et al.
    Hu, Rong-Gang
    Li, Yan
    Lin, Chang-Jian
    Pan, Jin-Shan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    Probing the vertical profiles of potential in a thin layer of solution closed to electrode surface during localized corrosion of stainless steel2012In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 61, p. 242-245Article in journal (Refereed)
    Abstract [en]

    Based on a home-built integrated system of scanning reference electrode technique and scanning tunneling microscope (SRET/STM), a method for in situ measurement of vertical potential in the thin layer of solution closed to electrode surface during localized corrosion of stainless steel has been successfully established in this work. An obviously different vertical profile of potential over corrosion active sites and passive sites were firstly observed. The reason for this different was discussed taking into account the distribution of electric field and concentration of Fe3+/Fe2+ in a thin layer solution closed to electrode surface, due to the occurrence of localized corrosion.

  • 122026.
    Ye, Diliao
    KTH, School of Information and Communication Technology (ICT).
    Indoor Positioning based on Wireless Channel Estimation2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122027.
    Ye, Fei
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Chemically Synthesized Nano-Structured Materials for Biomedical and Photonic Applications2012Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Nanostructured materials have attracted a broad interest for applications in scientific and engineering fields due to their extraordinary properties stemming from the nanoscale dimensions. This dissertation presents the development of nanomaterials used for different applications, namely biomedicine and dye lasing.

    Various inorganic nanoparticles have been developed as contrast agents for non-invasive medical imaging, such as magnetic resonance imaging (MRI) and X-ray computed tomography (CT), owing to their unique properties for efficient contrasting effect. Superparamagnetic iron oxide nanoparticles (SPIONs) are synthesized by thermo-decomposition method and phase-transferred to be hydrophilic used as MRI T2 (negative) contrast agents. Effects of surface modification of SPIONs by mesoporous silica (mSiO2) coating have been examined on the magnetic relaxivities. These contrast agents (Fe3O4@mSiO2) were found to have a coating-thickness dependent relaxation behavior and exhibit much higher contrast efficiency than that for the commercial ones. By growing thermo-sensitive poly(N-isopropylacrylamide -co-acrylamide) (P(NIPAAm-co-AAm)) as the outermost layer on Fe3O4@mSiO2 through free radical polymerization, a multifunctional core-shell nano-composite has been built up. Responding to the temperature change, these particles demonstrate phase transition behavior and were used for thermo-triggered magnetic separation. Their lower critical solution temperature (LCST) can be subtly tuned from ca. 34 to ca. 42 ˚C, suitable for further in vivo applications. An all-in-one contrast agent for MRI, CT and fluorescence imaging has been synthesized by depositing gadolinium oxide carbonate hydrate [Gd2O(CO3)2·H2O] shell on mSiO2-coated gold nanorod (Au NR), and then the particles were grafted with antibiofouling copolymer which can further link with the fluorescent dye. It shows both a higher CT and MRI contrast than the clinical iodine and gadolinium chelate contrast agent, respectively. Apart from the imaging application, owing to the morphology of Au NR, the particle has a plasmonic property of absorbing near-infrared (NIR) irradiation and suitable for future photothermal therapy. Cytotoxicity and biocompatibility of aforementioned nanoparticles have been evaluated and minor negative effects were found, which support their further development for medical applications.

    Gold nanoparticles embedded in the optical gain material, water solution of Rhodamine 6G (Rh6G) in particular, used in dye lasers can both increase and damp the dye fluorescence, thus, changing the laser output intensity. The studies of size effect and coating of gold nanoparticles on photostability of the gain media reveal that small sized (ca. 5.5 nm) gold nanoparticles are found detrimental to the photostability, while for the larger ones (ca. 25 nm) fluorescence enhancement rather than quenching is likely to occur. And a noticeable improvement of the photostability for the gain material is achieved when gold is coated with SiO2.

  • 122028.
    Ye, Fei
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Synthesis of nanostructured and hierarchical materials for bio-applications2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In recent years, nanostructured materials incorporated with inorganic particles and polymers have attracted attention for simultaneous multifunctional biomedical applications. This thesis summarized three works, which are preparation of mesoporous silica coated superparamagnetic iron oxide (Fe3O4@mSiO2) nanoparticles (NPs) as magnetic resonance imaging T2 contrast agents, polymer grafted Fe3O4@mSiO2 NPs response to temperature change, synthesis and biocompatibility evaluation of high aspect ratio (AR) gold nanorods.

    Monodisperse Fe3O4@mSiO2 NPs have been prepared through a sol-gel process. The coating thickness and particle sizes can be precisely controlled by varying the synthesis parameters. Impact of surface coatings on magnetometric and relaxometric properties of Fe3O4 NPs is studied. The efficiency of these contrast agents, evaluated by MR relaxivities ratio (r2/r1), is much higher than that of the commercial ones. This coating-thickness dependent relaxation behavior is explained due to the effects of mSiO2 coatings on water exclusion.

    Multifunctional core-shell composite NPs have been developed by growing thermo-sensitive poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AAm)) on Fe3O4@mSiO2 NPs through free radical polymerization. Their phase transition behavior is studied, and their lower critical solution temperature (LCST) can be subtly tuned from ca. 34 to ca. 42 °C, suitable for further in vivo applications.

    A seedless surfactant-mediated protocol has been applied for synthesis of high AR gold nanorods with the additive of HNO3. A growth mechanism based on the effect of nitrate ions on surfactant micelle elongation and Ostwald ripening process is proposed. The biocompatibility of high AR nanorods was evaluated on primary human monocyte derived dendritic cells (MDDCs). Their minor effects on viability and immune regulatory markers support further development for medical applications.

  • 122029. Ye, Fei
    et al.
    Barrefelt, Asa
    Asem, Heba
    Abedi-Valugerdi, Manuchehr
    El-Serafi, Ibrahim
    Saghafian, Maryam
    Abu-Salah, Khalid
    Alrokayan, Salman
    Muhammed, Mamoun
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
    Hassan, Moustapha
    Biodegradable polymeric vesicles containing magnetic nanoparticles, quantum dots and anticancer drugs for drug delivery and imaging2014In: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 35, no 12, p. 3885-3894Article in journal (Refereed)
    Abstract [en]

    We have developed biodegradable polymeric vesicles as a nanocarrier system for multimodal bioimaging and anticancer drug delivery. The poly(lactic-co-glycolic acid) (PLGA) vesicles were fabricated by encapsulating inorganic imaging agents of superparamagnetic iron oxide nanoparticles (SPION), manganese-doped zinc sulfide (Mn:ZnS) quantum dots (QDs) and the anticancer drug busulfan into PLGA nanoparticles via an emulsion-evaporation method. T-2(*)-weighted magnetic resonance imaging (MRI) of PLGA-SPION-Mn:ZnS phantoms exhibited enhanced negative contrast with r(2)(*) relaxivity of approximately 523 s(-1) mM(-1) Fe. Murine macrophage (J774A) cellular uptake of PLGA vesicles started fluorescence imaging at 2 h and reached maximum intensity at 24 h incubation. The drug delivery ability of PLGA vesicles was demonstrated in vitro by release of busulfan. PLGA vesicle degradation was studied in vitro, showing that approximately 32% was degraded into lactic and glycolic acid over a period of 5 weeks. The biodistribution of PLGA vesicles was investigated in vivo by MRI in a rat model. Change of contrast in the liver could be visualized by MRI after 7 min and maximal signal loss detected after 4 h post-injection of PLGA vesicles. Histological studies showed that the presence of PLGA vesicles in organs was shifted from the lungs to the liver and spleen over time.

  • 122030.
    Ye, Fei
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Brismar, Torkel
    Shi, Jingwen
    Lin, Dong
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Sayed, Ramy El
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Toprak, Muhammet
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Muhammed, Mamoun
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Gold nanorod/mesoporoussilica/gadolinium oxide carbonate hydrate core/shell nanoparticles: A multimodalcontrast agent for MRI, CT and fluorescence imaging2012Manuscript (preprint) (Other academic)
  • 122031.
    Ye, Fei
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Laurent, Sophie
    Fornara, Andrea
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Astolfi, Laura
    Qin, Jian
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Roch, Alain
    Martini, Alessandro
    Toprak, Muhammet
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Muller, Robert N.
    Muhammed, Mamoun
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Uniform mesoporous silica coated iron oxide nanoparticles as a highly efficient, nontoxic MRI T2 contrast agent with tunable proton relaxivities2012In: Contrast Media & Molecular Imaging, ISSN 1555-4309, E-ISSN 1555-4317, Vol. 7, no 5, p. 460-468Article in journal (Refereed)
    Abstract [en]

    Monodisperse mesoporous silica (mSiO2) coated superparamagnetic iron oxide (Fe3O4@mSiO2) nanoparticles (NPs) have been developed as a potential magnetic resonance imaging (MRI) T2 contrast agent. To evaluate the effect of surface coating on MRI contrast efficiency, we examined the proton relaxivities of Fe3O4@mSiO2 NPs with different coating thicknesses. It was found that the mSiO2 coating has a significant impact on the efficiency of Fe3O4 NPs for MRI contrast enhancement. The efficiency increases with the thickness of mSiO2 coating and is much higher than that of the commercial contrast agents. Nuclear magnetic resonance (NMR) relaxometry of Fe3O4@mSiO2 further revealed that mSiO2 coating is partially permeable to water molecules and therefore induces the decrease of longitudinal relaxivity, r1. Biocompatibility evaluation of various sized (ca. 3595 nm) Fe3O4@mSiO2 NPs was tested on OC-k3 cells and the result showed that these particles have no negative impact on cell viability. The enhanced MRI efficiency of Fe3O4@mSiO2 highlights these coreshell particles as highly efficient T2 contrast agents with high biocompatibility.

  • 122032.
    Ye, Fei
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics (Closed 20120101), Functional Materials, FNM (Closed 20120101).
    Qin, Jian
    KTH, School of Information and Communication Technology (ICT), Material Physics (Closed 20120101), Functional Materials, FNM (Closed 20120101).
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Material Physics (Closed 20120101), Functional Materials, FNM (Closed 20120101).
    Muhammed, Mamoun
    KTH, School of Engineering Sciences (SCI), Applied Physics, Functional Materials, FNM.
    Multifunctional core-shell nanoparticles: superparamagnetic, mesoporous, and thermosensitive2011In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 13, no 11, p. 6157-6167Article in journal (Refereed)
    Abstract [en]

    Multifunctional core-shell composite nanoparticles (NPs) have been developed by the combination of three functionalities into one entity, which is composed of a single Fe3O4 NP as the magnetic core, mesoporous silica (mSiO2) with cavities as the sandwiched layer, and thermosensitive poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AAm)) copolymer as the outer shell. The mSiO2-coated Fe3O4 NPs (Fe3O4@mSiO2) are monodisperse and the particle sizes were varied from 25 to 95 nm by precisely controlling the thickness of mSiO2-coating layer. The P(NIPAAm-co-AAm) were then grown onto surface-initiator-modified Fe3O4@mSiO2 NPs through free radical polymerization. These core-shell composite NPs (designated as Fe3O4@mSiO2@P(NIPAAm-co-AAm)) were found to be superparamagnetic with high r2 relaxivity. To manipulate the phase transition behavior of these thermosensitive polymer-coated NPs for future in vivo applications, the characteristic lower critical solution temperature (LCST) was subtly tuned by adjusting the composition of the monomers to be around the human body temperature (i.e. 37 °C), from ca. 34 to ca. 42 °C. The thermal response of the core-shell composite NPs to the external magnetic field was also demonstrated. Owing to their multiple functionality characteristics, these porous superparamagnetic and thermosensitive NPs may prove valuable for simultaneous magnetic resonance imaging (MRI), temperature-controlled drug release, and temperature-programed magnetic targeting and separation applications.

  • 122033.
    Ye, Fei
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Vallhov, Helen
    Clinical Allergy Research Unit, Department of Medicine, Karolinska Institute and University Hospital Solna, Sweden.
    Qin, Jian
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Daskalaki, Evangelia
    Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet and Universty Hospital Solan, Sweden.
    abhilash, Sugunan
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Fornara, Andrea
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Gabrielsson, Susanne
    Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet and Universty Hospital Solan, Sweden.
    Scheynius, Annika
    Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet and Universty Hospital Solan, Sweden.
    Muhammed, Mamoun
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Synthesis of high aspect ratio gold nanorods and their effects on human antigen presenting dendritic cells2011In: International Journal Of Nanotechnology, ISSN 1475-7435, Vol. 8, no 8-9, p. 631-652Article in journal (Refereed)
    Abstract [en]

    High aspect ratio (AR) gold nanorods (NRs) attract great interest for biomedical applications due to their novel physicochemical properties. Here, we report a facile method for preparation of high AR gold NRs through a seedless surfactant-mediated protocol with the additive of nitric acid. High-resolution transmission electron microscopy studies showed that the concentration of nitric acid has great effects on the crystal structures of the initially formed nuclei and consequently the growth of gold NRs. A mechanism based on the effect of nitrate ions on surfactant micelle elongation and Ostwald ripening process is proposed for the growth of high AR gold NRs. The biocompatibility of high AR NRs was evaluated on primary human monocyte derived dendritic cells (MDDCs), and compared with that of spherical gold nanoparticles (NPs) and low AR NRs. Low AR (similar to 4.5) gold NRs induced considerable cell death due to CTAB, while spherical gold NPs (7 nm) and high AR (similar to 21) gold NRs showed no or minor effects on viability and immune regulatory markers, which supports the further development of high AR gold NRs for medical applications.

  • 122034. Ye, Fei
    et al.
    Zhao, Ying
    Ei-Sayed, Ramy
    Muhammed, Mamoun
    KTH. Alexandria University, Egypt.
    Hassan, Moustapha
    Advances in nanotechnology for cancer biomarkers2018In: Nano Today, ISSN 1748-0132, E-ISSN 1878-044X, Vol. 18, p. 103-123Article in journal (Refereed)
    Abstract [en]

    Cancer biomarkers with high selectivity, specificity and reproducibility play essential role in diagnosis, prognosis and prediction of treatment efficacy in cancer patients. However, the current biomarker assays used in clinics could be improved due to low sensitivity and specificity. Nanoparticle-based assays are emerging as an upcoming approach, providing ultra-high sensitivity and specificity in cancer biomarker detection. The current survey presents an overview of strategies used in the development and integration of nanoparticles for cancer biomarker detection, including mass spectrometry, optical and electrical detection methods. Moreover, we discuss the future trends in the field in correlation to new approaches from fundamental and practical standpoints.

  • 122035. Ye, F.M.
    et al.
    Yang, James
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.
    Wang, S. R.
    Turbine governing and surge-tank stability1992In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079, Vol. 30, no 1Article in journal (Refereed)
    Abstract [en]

    The stability of water-surface oscillations is investigated for the case of a tailrace surge chamber shared by two or more generating units in a hydroelectric power plant. Two kinds of turbine governing are applied for the condition of small-amplitude surge perturbations. Critical stability conditions for the surge chamber are derived by linearizing the ordinary differential equations describing the lumped system. As compared with the result achieved by previous researchers, the common surge chamber requires smaller horizontal crosssection for surge stability. A combination of the proposed manners of governing can be utilized in certain power plants in order to achieve an economical design of the surge chambers.

  • 122036.
    Ye, He
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Theoretical Computer Science, TCS.
    Martinez, Matias
    Univ Valenciennes, Valenciennes, France..
    Durieux, Thomas
    INESC ID, Lisbon, Portugal..
    Monperrus, Martin
    KTH, School of Electrical Engineering and Computer Science (EECS), Theoretical Computer Science, TCS.
    A Comprehensive Study of Automatic Program Repair on the QuixBugs Benchmark2019In: 2019 IEEE 1ST INTERNATIONAL WORKSHOP ON INTELLIGENT BUG FIXING (IBF '19) / [ed] Cheung, SC Sun, X Zhang, T, IEEE , 2019, p. 1-10Conference paper (Refereed)
    Abstract [en]

    Automatic program repair papers tend to repeatedly use the same benchmarks. This poses a threat to the external validity of the findings of the program repair research community. In this paper, we perform an automatic repair experiment on a benchmark called QuixBugs that has never been studied in the context of program repair. In this study, we report on the characteristics of QuixBugs, and study five repair systems, Arja, Astor, Nopol, NPEfix and RSRepair, which are representatives of generate-and-validate repair techniques and synthesis repair techniques. We propose three patch correctness assessment techniques to comprehensively study overfitting and incorrect patches. Our key results are: 1) 15 / 40 buggy programs in the QuixBugs can be repaired with a test-suite adequate patch; 2) a total of 64 plausible patches for those 15 buggy programs in the QuixBugs are present in the search space of the considered tools; 3) the three patch assessment techniques discard in total 33 / 64 patches that are overfitting. This sets a baseline for future research of automatic repair on QuixBugs. Our experiment also highlights the major properties and challenges of how to perform automated correctness assessment of program repair patches. All experimental results are publicly available on Github in order to facilitate future research on automatic program repair.

  • 122037. Ye, He
    et al.
    Martinez, Matias
    Monperrus, Martin
    A Comprehensive Study of Automatic Program Repair on the QuixBugs BenchmarkManuscript (preprint) (Other academic)
    Abstract [en]

    Automatic program repair papers tend to repeatedly use the same benchmarks. This poses a threat to the external validity of the findings of the program repair research community. In this paper, we perform an automatic repair experiment on a benchmark called QuixBugs that has been recently published. This benchmark has never been studied in the context of program repair. In this study, we report on the characteristics of QuixBugs, and we design and perform an experiment about the effectiveness of test-suite based program repair on QuixBugs. We study two repair systems, Astor and Nopol, which are representatives of generate-and-validate repair technique and synthesis repair technique respectively. We propose three patch correctness assessment techniques to comprehensively study overfitting and incorrect patches. Our key results are: 1) 13/40 buggy programs in the QuixBugs can be repaired with a test-suite adequate patch; 2) a total of 22 different plausible patches for those 13 buggy programs in the QuixBugs are present in the search space of the considered tools; 3) the three patch assessment techniques discard in total 12/22 patches that are overfitting. This sets a baseline for future research of automatic repair on QuixBugs. Our experiment also highlights the major properties and challenges of how to perform automated correctness assessment of program repair patches. All experimental results are publicly available on Github in order to facilitate future research on automatic program repair.

  • 122038.
    Ye, Julia
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Optimization of Computer Clusters.: A Cost- Efficient Approach to License Distribution.2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

     

    This study is formed with respect to finding a suitable optimization method of the total costs for the number of jobs that are executed in a FEM solver at Scania. FEM (Finite Element Method) is a solution method for solid mechanic problems. It is good to withhold the calculation speed with GPU, CPU and licenses taken into consideration. Computer clusters are usable for the purpose of optimizing the solving speed. Several factors are involved and it is appropriate to consider many parameters to finally end up in a consequent method.

    The total cost

    ΣiNi . ( licence cost + hardware cost) was minimized and simulated with respect to the parameters: core number and number of GPU. N is the number of jobs executed. Linear constraints were added to further precise the model though the primary task was to formulate the optimization problem.

  • 122039.
    Ye, Lin
    et al.
    KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Fodor, Viktoria
    KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Giannetsos, Athanasios
    KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Papadimitratos, Panagiotis
    KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Path metric authentication for low-power and lossy networks2015In: 1st ACM International Workshop on Cyber-Physical Systems for Smart Water Networks, CySWater 2015, Association for Computing Machinery (ACM), 2015Conference paper (Refereed)
    Abstract [en]

    Cyber physical systems often require sensor networks to perform unattended operation for a long time, while providing performance guarantees for monitoring and control applications. Since this poses requirements on the formed wireless sensor network topology, routing protocols provide a means to construct topologies according to complex objective functions, involving several routing metrics. As the metric values affect the emerging topology significantly, they need to be protected, to avoid topology formation attacks from malicious users. In this paper we consider the specific case of RPL based routing and propose a lightweight authentication approach to protect RPL path metrics. We evaluate the cost of metric authentication and show how to tradeoff the introduced tree construction delay and the achieved metric accuracy.

  • 122040.
    Ye, Lu
    et al.
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Gao, Yan
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Cao, Shuyan
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Chen, Hu
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Yao, Yanan
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Hou, Jungang
    Dalian Univ Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
    Sun, Licheng
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
    Assembly of highly efficient photocatalytic CO2 conversion systems with ultrathin two-dimensional metal-organic framework nanosheets2018In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 227, p. 54-60Article in journal (Refereed)
    Abstract [en]

    An ultrathin two-dimensional Zn porphyrin-based metal-organic framework (Zn-MOF nanosheets) is developed and used for the first time in photoreduction of CO2 to CO. Consequently, two novelty noble-metal-free hybrid photocatalytic systems are established and displayed outstanding photocatalytic activity and selectivity for CO evolution under mild photocatalytic reaction conditions. The insight revealed Zn-MOF nanosheets as photo sensitizer displays a better charge transport ability and longer lifetime of the photogenerated electron-hole pairs than the Zn-MOF bulk, which are confirmed by photoelectrochemical impedance and photoluminescence (PL) measurements. These studies show that the development of noble-metal-free photocatalytic systems and various MOF-based materials for photocatalytic applications are promising.

  • 122041. Ye, Lu
    et al.
    Liu, Jinxuan
    Gao, Yan
    Gong, Chenghuan
    Addicoat, Matthew
    Heine, Thomas
    Woell, Christof
    Sun, Licheng
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Dalian University of Technology, China.
    Highly oriented MOF thin film-based electrocatalytic device for the reduction of CO2 to CO exhibiting high faradaic efficiency2016In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 40, p. 15320-15326Article in journal (Refereed)
    Abstract [en]

    A monolithic, highly electrochemically efficient Re-based metal-organic framework (MOF) thin film has been deposited onto a conductive FTO electrode by liquid-phase epitaxy. The X-ray diffraction (XRD) analysis reveals the presence of a highly oriented film grown exclusively along the [001] direction. This epitaxially-grown SURMOF exhibits an extremely high faradaic efficiency of 93 +/- 5% when operated as an electrocatalyst for the reduction of CO2 to CO. In addition, the obtained current densities of the high-quality monolithic coatings exceed 2 mA cm(-2), a value at least one order of magnitude larger than that reported for previous electrocatalytically active MOF thin films.

  • 122042.
    Ye, Luming
    KTH, School of Technology and Health (STH), Medical Engineering.
    Perception Metrics in Medical Imaging2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122043.
    Ye, Qiang
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Liu, Jian
    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), Electronic, Computer and Software Systems, ECS.
    Switch design and implementation for Network-on-Chip2005In: Proceedings of the Seventh IEEE CPMT Conference on High Density Microsystem Design, Packaging and Failure Analysis (HDP'05), 2005, p. 412-418Conference paper (Refereed)
    Abstract [en]

    When Network on Chip (NoC) is being developed in recent years, new challenges are accruing since a large number of heterogeneous cores are integrated on a single silicon die: On-chip switching networks seem to be one, scalable global interconnection solution for SoC. Packet switching is becoming predominant in today's NoC, the main advantage is that it supports many cores communicating simultaneously without dedicated data paths. Disadvantages are also obvious, packets may get lost in transmission since there are no predictable paths between cores. It takes extra time to reorder packets after they arrive at destination. Therefore, packet switching is not used for the multicast-supporting (MS) and guaranteed-throughput (GT) switching networks that require restricted latency and reliable data transmission. Time-space-time (TST) switch - designed for circuit switching networks using time division multiplexing (TDM) scheme is used in our MS & GT switching network. With this architecture, data can be efficiently transmitted in restricted channels and arrive after a constant latency. In the multimessage multicasting TST switch supporting messages with one sender and multiple receivers, each input buffer has only one read port, meaning that only one memory location can be accessed each clock cycle. To make the read/write operations parallel and hence reduce the demand on read/write bandwidth, scheduling is required. The switch employs an approximation algorithm for multimessage multicasting since scheduling of multicast communication is an NP-hard problem. With an approximation bound of qd + f(1/a) (d - 1) for fan-out f >= 3, the throughput increases when the data width grows. The main design objective is to develop a switch with very small area and delay, enabling its immediate practical use.

  • 122044.
    Ye, Qianyun
    KTH, School of Information and Communication Technology (ICT).
    2.4-GHz Wireless Network Based Multi-Tag Access System2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Machine-to-Machine technology has been intensively researched recently which is believed to take the role of leading ICT industry development. Wireless Sensor Networks provide solution to integrate numerous numbers of machines who require features include low power, low cost, and flexible, which can be fulfilled by applying Zigbee technique.

    This thesis devotes an effort into Wireless Sensor Network development that a Multi- Tag System operating on 2.4-GHz wireless network is developed. A theoretical study about ZigBee protocol and its bottom layers IEEE 802.15.4 standard is provided to lay a foundation of the design work. The thesis also includes a practical usage of low cost TI CC2530 Systom-on-Chip, together with the illustration of software development inside the chip. The design work provides GUI Platform for users to register themselves into the network and central monitoring platform to track all users within the area. Both GUI platforms are developed based on VB IDE.

    The Multi-Tag Access System is suitable for attendee control functionality in big-scale conference, events, and lecture, which is also a prototype expecting more functionality to be added in the future.

  • 122045.
    Ye, Qing
    KTH, School of Computer Science and Communication (CSC).
    Matchmaking: How International Online Education Search Services Could Approach the Chinese Market?2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Many Chinese students seek an international education and they are often a target for international universities. These universities utilize online platforms for advertising to reach students. Various domestic and international intermediaries join to facilitate this online informing as well. On the market combined of the universities and the intermediaries, the online education search service is one of the most popular witnesses.

    The purpose of this thesis is to investigate the gap between Chinese students and the existing market, and to express how international online education search services should best approach the market. Key value propositions will also be formulated to detail these international services.

    The research method in this thesis is qualitative, and based on a case study of an international company in Sweden. This company is active in the online education search service and interested in the Chinese market. The case study comprises a pilot launch in China, as well as qualitative semi-structured interviews with employees within the company and with sample students in China. Two additional expert interviews have been conducted external to the case company, in order to increase the reliability of the study. The analysis of this empirical material in conjunction with the literature leads to my conclusion that Chinese students favor complete resources and integrated information, as well as a combination of online and offline practices. Furthermore, the Business Model Canvas is utilized as a theoretical foundation for investigating relevant elements of the value propositions. Finally, I propose a model of approach in both theoretical and practical formats to guide how international online education search services should approach the Chinese market.

  • 122046.
    Ye, Simon
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Acoustic mixing in microfluidic chip using a Langevin transducer2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122047.
    Ye, Simon
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Acoustic mixing in microfluidic chip using a Langevin transducer2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 122048. Ye, T.
    et al.
    Lu, Y.
    Liu, F.
    Li, Q.
    Zhang, Ziyang
    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.
    Su, Y.
    160-Gb/s NRZ-to-PSK conversion using linear filtering in silicon ring resonators2008Conference paper (Refereed)
    Abstract [en]

    This paper proposes a scheme to achieve high-speed, all-optical non-retum-to-zero to phase-shift keying (NRZ-to-PSK) conversion by using the linear filtering in the silicon ring resonators. Simulation results are provided to verify the feasibility.

  • 122049.
    Ye, Xin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Zhang, Xintong
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    PLM for Multiple Lifecycle Product: Concepts, terminologies, processes for collaborative information management2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Natural raw materials are consumed at a rapid rate due to the ever-growing population and the endless pursuance of higher living standard of human kind, which alerts the manufacturing industry that resource crisis would come soon if no proactive actions are taken. Rapid manufacturing and consuming of products also brings about the serious environmental problems, e.g. over mining leads to surface water and groundwater pollution, energy consumption emits huge greenhouse gases, countless solid wastes threats human’s health and the sustainable use of land. Manufacturing industry is faced with the dilemma of either to keep the economic growth to meet the increasing society demand by immolating the earth and eco-system, or to save the earth by sacrificing economic growth. However, besides those two alternatives, we could rethink about developing innovative sustainable manufacturing strategies to find the balance point of environmental, economic and social sustainability. In this thesis, Multiple Lifecycle Product (MLP) is put forward as a solution towards sustainable manufacturing. It aims to shift the current open loop manufacturing model i.e. “take-make-dispose” to a seamless closed loop manufacturing model, which enables a product to have multiple lifecycles for maximizing the utilization of raw material, minimizing the consumption of energy and recapture the utmost value-added i.e. inputs in terms of labor, plant, equipment, etc. Resource Conservative Manufacturing (ResCoM) is such a closed loop manufacturing system developedbased on MLP concept, which implements MLP through a series of meticulous and collaborative works of product design, business model, closed loop supply chain and remanufacturing. Numberless information will be generated from the collaborative work during the implementation of MLP, and in each lifecycle of a MLP a wide range of product-related information has to be archived properly. Therefore, this research work starts to develop a new PLM for MLP, also called ResCoM PLM which will be one of the most powerful support tools for information management and decision-making of MLP manufacturing. As the beginning of ResCoM PLM research, this thesis targets to create a framework and foundation of ResCoM PLM research. Concepts and terminologies in the area of PLM for MLP are established systematically, and the ambiguous or overlapped concepts and terms presented in the state-of-the-art will be compared and explained. IDEF0 information model of MLP is createdby investigating the essential activities of implementing MLP, i.e. product design, business design, closed loop supply chain management and remanufacturing/manufacturing. Through elaborating the mutual interdependence, interactions, feedback and causalities among the essential activities and revealing the information and material flows of MLP manufacturing helps the readers to have deep understanding of MLP manufacturing and identify the issues of ResCoM PLM research.

  • 122050.
    Ye, Xinchen
    KTH, School of Chemical Science and Engineering (CHE).
    Nanocomposites Based on Whey Protein Nano-Fibrils and Matrix2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The inclusion of nanoparticles has opened new possibilities to enhance and tune the properties of biobased materials. We here explored an approach to create protein homo-nanocomposites in which the nanoparticles and matrix are made from the same raw material. Whey protein isolate, as the raw material, are known to self-assemble into highly ordered nanofibrils under certain conditions. 2.5 - 15 % of protein nanofi brils solution was mixed with non-fibrillar matrix and 33 % glycerol as plasticizer. Tensile tests indicated increased elastic modulus and decreased  maximal elongation as function of increasing amounts of nanofibrils. The ultimate strength was less affected. It can be explained by the growth of  strongly  hydrogen-bonded peptide group in P-s heets observed by  IR  spectroscopy.  The  undulating  surface  and exifoliated P-sheets a lso have influence on the mechanical properties of the films.  Taken together, our study shows that it is possible to control the mechanical properties  of protein­  based materials  by addition  of protein nanofibrils.

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