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Sökning: WFRF:(Zhu Kun)

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  • Föregående 123[4]567Nästa
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31.
  • Sandels, Claes, et al. (författare)
  • Analyzing fundamental aggregation functions in power systems
  • 2011
  • Ingår i: IEEE PES Innovative. Smart Grid Technol. Conf. Europe. - : IEEE. - 9781457714214
  • Konferensbidrag (refereegranskat)abstract
    • The concept of Aggregators is receiving large attention when new business cases for Smart grids are presented. Several studies propose different schemes of aggregating load and/or production. However, many of these studies are tailored for one specific market or network, making the generic value of the work small. The objective of the work presented in the paper is to analyze the fundamental needs for aggregating small scale loads or production units from a technical, financial and regulatory point of view. The final results of the analysis can work as a foundation for developing more elaborate aggregation business cases. These can later be analyzed from a technical and economical standpoint by, e.g., simulations.
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32.
  • Tian, Yu, et al. (författare)
  • Revealing morphology rules of MX precipitates in Ti-V-Nb multi-microalloyed steels
  • 2022
  • Ingår i: Materials Characterization. - : Elsevier BV. - 1044-5803 .- 1873-4189. ; 188
  • Tidskriftsartikel (refereegranskat)abstract
    • Despite a large number of studies relevant to MX (M = Ti, V, Nb; X = C, N) precipitation in microalloyed steels, the evolution rules of the precipitate morphology remain unclear. In this work, the precipitation behavior and morphological characteristics of MX precipitates in deformed Ti-V-Nb multi-microalloyed steels under contin-uous cooling were revealed through integrating transmission electron microscopy and theoretical models. The experimental results demonstrate that the precipitates are mainly Ti-rich cuboidal multi-component precipitates and irregular compound precipitates formed in austenite, and fine spherical V8C7 precipitates formed in ferrite. For the first time, the L parameter model that evaluates the shape of MX precipitates has been introduced into microalloyed steels, together with the validating experiments. In austenite, as the L increases, precipitates tend to become cuboidal under equilibrium conditions while rod-like elongating along their (100) orientation under deformation conditions; in ferrite, as the L increases, precipitates tend to be disk-like under equilibrium con-ditions while thin elliptical cylindrical extending along their (110) orientation on the habit plane under defor-mation conditions. The evolution rules of precipitate morphology revealed in this work provide insights in controlling precipitates morphology to develop high-performance microalloyed steels.
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33.
  • Woo, Jong Hun, et al. (författare)
  • Assessment Framework of Smart Shipyard Maturity Level via Data Envelopment Analysis
  • 2021
  • Ingår i: Sustainability. - : MDPI AG. - 2071-1050. ; 13:4
  • Tidskriftsartikel (refereegranskat)abstract
    • The fourth industrial revolution ("Industry 4.0") has caused an escalating need for smart technologies in manufacturing industries. Companies are examining various cutting-edge technologies to realize smart manufacturing and construct smart factories and are devoting efforts to improve their maturity level. However, productivity improvement is rarely achieved because of the large variety of new technologies and their wide range of applications; thus, elaborately setting improvement goals and plans are seldom accomplished. Fortunately, many researchers have presented guidelines for diagnosing the smartness maturity level and systematic directions to improve it, for the eventual improvement of productivity. However, most research has focused on mass production industries wherein the overall smartness maturity level is already high (e.g., high-level automation). These studies thus have limited applicability to the shipbuilding industry, which is basically a built-to-order industry. In this study, through a technical demand survey of the shipbuilding industry and an investigation of existing smart manufacturing and smart factories, the keywords of connectivity, automation, and intelligence were derived and based on these keywords, we developed a new diagnostic framework for smart shipyard maturity level assessment. The framework was applied to eight shipyards in South Korea to diagnose their smartness maturity level, and a data envelopment analysis (DEA) was performed to confirm the usefulness of the diagnosis results. By comparing the DEA models, the results with the smart level as an input represents the actual efficiency of shipyards better than the results of conventional models.
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34.
  • Wu, Renbing, et al. (författare)
  • Pt nanodendrites anchored on bamboo-shaped carbon nanofiber arrays as highly efficient electrocatalyst for oxygen reduction reaction
  • 2013
  • Ingår i: International journal of hydrogen energy. - 0360-3199 .- 1879-3487. ; 38:36, s. 16677-16684
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to improve the Pt utilization and enhance their catalytic performance in fuel cells, a novel composite electrode composed of single-crystalline Pt nanodendrites and support constructed by bamboo-shaped carbon nanofiber arrays (CNFAs) on carbon paper, is reported. This electrode is designed by growing vertically CNFAs on carbon paper via plasma enhanced chemical vapor deposition, followed by the direct synthesis of Pt nanodendrites using a simple surfactant-free aqueous solution method. Electron microscopy studies reveal that the Pt nanodendrites are uniformly high dispersed and anchored on the surface of CNFAs. Electrochemical measurements demonstrate that the resultant electrode exhibits higher electrocatalytic activity and stability for oxygen reduction reaction than commercial Pt/C catalyst, suggesting its potential application in fuel cells.
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35.
  • Wu, Yiming, 1987-, et al. (författare)
  • Framework incorporating synchronized phasor data for power system operation and control
  • 2012
  • Ingår i: The 9th IET International Conference on Advances in Power System Control, Operation and Management. - : Institution of Engineering and Technology. - 9781849197434
  • Konferensbidrag (refereegranskat)abstract
    • This position paper presents initial research and investigation on a unified framework combining two independent systems, the legacy SCADA system and the synchronized phasor data system, that share the same measurement sources, i.e., current and voltage transducers and the same communication medium. In this framework, conventional SCADA system coupled with substation automation system are modeled together with synchronized phasor systems. The contribution of this paper also includes a state-of–the-art survey of topics related to the proposed architectures. Furthermore, an overview of the data flows between substation and control centers including both SCADA and phasor measurements are presented. Taking into consideration the growing interest in communication and automation standardization this paper also addresses the communication between the substations coupled with relevant standards and technology.
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36.
  • Wu, Yiming, 1987-, et al. (författare)
  • Perspectives on Peer-to-Peer Data Delivery Architectures for Next Generation Power Systems
  • 2013
  • Ingår i: Smart Grid Management.
  • Konferensbidrag (refereegranskat)abstract
    • Introduction of new Information and Communication Technologies (ICT) and aggregation of equipment bring in new perspectives in terms of the increasing number of data users. It also brings new data delivery requirements which are difficult to be met by the legacy systems. Off-the-shelf standards and communication technologies are the enablers to push current data delivery solutions to a new level. At this level this new data delivery system can fulfill Quality of Service (QoS) requirements of next generation power system. This paper proposes a comprehensive architecture of Peer-to-Peer (P2P) based overlay-control data delivery system covering all levels of data delivery. The core technology of such an architecture lays on the Intelligent Substation Gateway (ISG), which is employed to provide data delivery service to meet the QoS requirements. Proposed data delivery system brings advantages as autonomy, flexibility, scalability, and efficient to the power system.
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37.
  • Xie, M., et al. (författare)
  • A seasonal ARIMA model with exogenous variables for elspot electricity prices in Sweden
  • 2013
  • Ingår i: European Energy Market (EEM), 2013 10th International Conference on the. - : IEEE. - 9781479920082 ; , s. 6607293-
  • Konferensbidrag (refereegranskat)abstract
    • In a spot market, price prediction plays an indispensable role in maximizing the benefit of a producer as well as optimizing the utility of a consumer. This paper develops a seasonal ARIMA model with exogenous variables (SARIMAX) to predict day-ahead electricity prices in Elspot market, the largest day-ahead market for power trading in the world. Compared with the basic ARIMA model, SARIMAX has two distinct features: 1) A seasonal component is introduced to cope with weekly effect on price fluctuations. 2) Exogenous variables that exert influence on electricity prices are incorporated to make price predictions in the context of an integrated energy market. A detailed implementation of SARIMAX for Elspot market in Sweden is presented.
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38.
  • Ye, Chenhui, et al. (författare)
  • All-Optical Approach to Microwave Frequency Measurement With Large Spectral Range and High Accuracy
  • 2012
  • Ingår i: IEEE Photonics Technology Letters. - : IEEE. - 1041-1135 .- 1941-0174. ; 24:7, s. 614-616
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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39.
  • Ye, Chenhui, et al. (författare)
  • An All-Optical Transformer From Differential NRZ Data to Ultra-Wideband Pulse Stream
  • 2011
  • Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 23:9, s. 579-581
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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40.
  • Zhang, Shuai, et al. (författare)
  • MIMO reference antennas for OTA applications
  • 2013
  • Ingår i: 2013 7th European Conference on Antennas and Propagation, EuCAP 2013. - New York : IEEE. - 9788890701832 ; , s. 2556-2557, s. 2243-2244
  • Konferensbidrag (refereegranskat)abstract
    • In this paper, MIMO reference antennas with different correlation coefficients are proposed for Over-The-Air (OTA) applications. The correlation can be simply controlled through a slot etched on a dual-feed PIFA with the similar total efficiency. Three kinds of situations are investigated with the proposed method: high correlation (HC), mid correlation (MC), and low correlation (LC). In order to verify the introduced idea, the measurements of correlations and efficiencies are carried out in a reverberation chamber. The simulation and measurement agree well with each other.
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