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From Rags to Riches: Business Model Innovation Shifts in the Ecosystem of the Chinese Super League
Shuyang Liu,James Skinner,Anna Grosman 글로벌지식마케팅경영학회 2022 Journal of Global Sport Management Vol.7 No.3
The Chinese Super League (CSL) has witnessed unprecedented growth in recent years via evolutions in Chinese football clubs’ business models and the league environment. This paper analyses business model innovation (BMI) in the light of changing ecosystem factors via a case study of the Guangzhou Evergrande Taobao FC. It analyses the types of BMI and finds that BMI constancy and novelty are key to the club’s success. The study identifies policy and investors as the two ecosystem factors with the most significant influence on the club’s BMI. We argue that CSL clubs have unique and under-rated value capture structures, where the value is captured by their investors rather than by the clubs themselves. Being sensitive to the ecosystem is another key factor and we give guidance on how to anticipate ecosystem changes and adjust business models accordingly. This can be generalized to other organizations and industries.
Design and Realization of Precise Indoor Localization Mechanism for Wi-Fi Devices
Su, Weideng,Liu, Erwu,Auge, Anna Calveras,Garcia-Villegas, Eduard,Wang, Rui,You, Jiayi Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Despite the abundant literature in the field, there is still the need to find a time-efficient, highly accurate, easy to deploy and robust localization algorithm for real use. The algorithm only involves minimal human intervention. We propose an enhanced Received Signal Strength Indicator (RSSI) based positioning algorithm for Wi-Fi capable devices, called the Dynamic Weighted Evolution for Location Tracking (DWELT). Due to the multiple phenomena affecting the propagation of radio signals, RSSI measurements show fluctuations that hinder the utilization of straightforward positioning mechanisms from widely known propagation loss models. Instead, DWELT uses data processing of raw RSSI values and applies a weighted posterior-probabilistic evolution for quick convergence of localization and tracking. In this paper, we present the first implementation of DWELT, intended for 1D location (applicable to tunnels or corridors), and the first step towards a more generic implementation. Simulations and experiments show an accuracy of 1m in more than 81% of the cases, and less than 2m in the 95%.
Design and Realization of Precise Indoor Localization Mechanism for Wi-Fi Devices
( Weideng Su ),( Erwu Liu ),( Anna Calveras Auge ),( Eduard Garcia-villegas ),( Rui Wang ),( Jiayi You ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Despite the abundant literature in the field, there is still the need to find a time-efficient, highly accurate, easy to deploy and robust localization algorithm for real use. The algorithm only involves minimal human intervention. We propose an enhanced Received Signal Strength Indicator (RSSI) based positioning algorithm for Wi-Fi capable devices, called the Dynamic Weighted Evolution for Location Tracking (DWELT). Due to the multiple phenomena affecting the propagation of radio signals, RSSI measurements show fluctuations that hinder the utilization of straightforward positioning mechanisms from widely known propagation loss models. Instead, DWELT uses data processing of raw RSSI values and applies a weighted posterior-probabilistic evolution for quick convergence of localization and tracking. In this paper, we present the first implementation of DWELT, intended for 1D location (applicable to tunnels or corridors), and the first step towards a more generic implementation. Simulations and experiments show an accuracy of 1m in more than 81% of the cases, and less than 2m in the 95%.
PRI: A Practical Reputation-based Incentive Scheme for Delay Tolerant Networks
( Xi Zhang ),( Xiaofei Wang ),( Anna Liu ),( Quan Zhang ),( Chaojing Tang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.4
Delay tolerant networks (DTNs) characterized by the lack of guaranteed end-to-end paths exploit opportunistic data forwarding mechanism, which depends on the hypothesis that nodes are willing to store, carry, and forward the in-transit messages in an opportunistic way. However, this hypothesis might easily be violated by the presence of selfish nodes constrained with energy, bandwidth, and processing power. To address this problem, we propose a practical reputation-based incentive scheme, named PRI, to stimulate honest forwarding and discipline selfish behavior. A novel concept of successful forwarding credential and an observation protocol are presented to cope with the detection of nodes` behavior, and a reputation model is proposed to determine egoistic individuals. The simulation results demonstrate the effectiveness and practicality of our proposal.
Atomic-scale mixing between MgO and H₂O in the deep interiors of water-rich planets
Taehyun Kim,Stella Chariton,Vitali Prakapenka,Anna Pakhomova,Hanns-Peter Liermann,Zhenxian Liu,Sergio Speziale,Sang-Heon Shim,Yongjae Lee 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Water-rich planets exist in our Solar System (Uranus and Neptune) and are found to be common in the extrasolar systems (some of the sub-Neptunes). In conventional models of these planets a thick water-rich layer is underlain by a separate rocky interior. Here we report experimental results on two rock-forming minerals, olivine ((Mg,Fe)₂SiO₄) and ferropericlase ((Mg,Fe)O), in water at the pressure and temperature conditions expected for the water-rich planets. Our data indicate a selective leaching of MgO, which peaks between 20 and 40 GPa and above 1,500 K. For water-rich planets with 1–6 Earth masses (>50 wt% H₂O), the chemical reaction at the deep water–rock interface would lead to high concentrations of MgO in the H₂O layer. For Uranus and Neptune, the top ~3% of the H₂O layer would have a large storage capacity for MgO. If an early dynamic process enables the rock–H₂O reaction, the topmost H₂O layer may be rich in MgO, possibly affecting the thermal history of the planet.
Biocompatible Ti3Au–Ag/Cu thin film coatings with enhanced hardness and antimicrobial functionality
Cecil Cherian Lukose,Ioannis Anestopoulos,Iraklis‑Stavros Panagiotidis,Guillaume Zoppi,Anna M. Black,Lynn G. Dover,Leon Bowen,Ángel Serrano‑Aroca,Terence Xiaoteng Liu,Lorenzo Mendola,Davide Morrone,Mi 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background Biofilm formation on medical device surfaces is a persistent problem that shelters bacteria and encourages infections and implant rejection. One promising approach to tackle this problem is to coat the medical device with an antimicrobial material. In this work, for the first time, we impart antimicrobial functionality to Ti3Au intermetallic alloy thin film coatings, while maintaining their superior mechanical hardness and biocompatibility. Methods A mosaic Ti sputtering target is developed to dope controlled amounts of antimicrobial elements of Ag and Cu into a Ti3Au coating matrix by precise control of individual target power levels. The resulting Ti3Au- Ag/Cu thin film coatings are then systematically characterised for their structural, chemical, morphological, mechanical, corrosion, biocompatibility-cytotoxicity and antimicrobial properties. Results X-ray diffraction patterns reveal the formation of a super hard β-Ti3Au phase, but the thin films undergo a transition in crystal orientation from (200) to (211) with increasing Ag concentration, whereas introduction of Cu brings no observable changes in crystal orientation. Scanning and transmission electron microscopy analysis show the polyhedral shape of the Ti3Au crystal but agglomeration of Ag particles between crystal grains begins at 1.2 at% Ag and develops into large granules with increasing Ag concentration up to 4.1 at%. The smallest doping concentration of 0.2 at% Ag raises the hardness of the thin film to 14.7 GPa, a 360% improvement compared to the ∼4 GPa hardness of the standard Ti6Al4V base alloy. On the other hand, addition of Cu brings a 315—330% improvement in mechanical hardness of films throughout the entire concentration range of 0.5—7.1 at%. The thin films also show good electrochemical corrosion resistance and a > tenfold reduction in wear rate compared to Ti6Al4V alloy. All thin film samples exhibit very safe cytotoxic profiles towards L929 mouse fibroblast cells when analysed with Alamar blue assay, with ion leaching concentrations lower than 0.2 ppm for Ag and 0.08 ppm for Cu and conductivity tests reveal the positive effect of increased conductivity on myogenic differentiation. Antimicrobial tests show a drastic reduction in microbial survival over a short test period of < 20 min for Ti3Au films doped with Ag or Cu concentrations as low as 0.2—0.5 at%. Conclusion Therefore, according to these results, this work presents a new antimicrobial Ti3Au- Ag/Cu coating material with excellent mechanical performance with the potential to develop wear resistant medical implant devices with resistance to biofilm formation and bacterial infection.