The Enterprise Risk Management of Foreign Exchange Exposures: Evidence from Taiwanese Hospitality Industry

For this paper, I use the ARIMA model to study the relationship between business performance and exchange rate fluctuations. Through this model, the empirical results shows that the influences of foreign exchange rate fluctuations on the tourist hotel business performance are significant and different across currencies and firms. Furthermore, according to the framework of Kim (2013) we employ the modern portfolio theory proposed by Markowitz (1952) to give an optimal foreign exchange allocation for each tourist hotel company's financial decision-makers, which will avoid the risk of exchange rate fluctuations expose and reduce losses due to the fluctuations of exchange rates, and complete the construction of enterprise risk management system (ERM)

Service Alliance in Competition: A Game Theory Perspective

This research focuses on services based on alliance and devises a novel concept called service alliance. Service alliance uses service as the unit that companies can exchange, furnish, and share services in the alliance. Service alliance emphasizes on the representation and exchange for value of single service from an individual company. This research utilizes game theory to discuss the best action of service alliance in competition. We use airline industry as the example and expect to contribute to any service industry. The results show that four strategies are similar to the process from competition to cooperation. The best case is that the members in the alliance co-fund a new service team to serve all members. We hope the proposed concept can be applied to all service industry and create a new operation model for alliance

Building Ubiquitous Computing Environment by Using RFID in Aircraft MRO Process

The implementation of RFID had aroused discussion in every area. Experts believe that the emergence of RFID will cause another business revolution. Many industries had deployed RFID, like aviation industry, in which RFID is used in maintenance materials and baggage management. This paper discusses the implementation of RFID in MRO process and the building of a ubiquitous computing environment. We believe that our proposal has three merits to MRO (1) anti-counterfeit parts (2) MRO liability (3) efficient and effective inspection. The architecture can address the competition pressure that aviation industry faces and consequently enhance competition advantages

Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea

Author Posting. © Acoustical Society of America, 2013. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 133 (2013): 1306-1319, doi:10.1121/1.4789358.Internal waves and bathymetric variation create time- and space-dependent alterations in the ocean acoustic waveguide, and cause subsequent coupling of acoustic energy between propagating normal modes. In this paper, the criterion for adiabatic invariance is extended to the case of an internal solitary wave (ISW) encountering a sloping bathymetry (i.e., continental shelfbreak). Predictions based on the extended criterion for adiabatic invariance are compared to experimental observations from the Asian Seas International Acoustics Experiment. Using a mode 1 starter field, results demonstrate time-dependent coupling of mode 1 energy to higher adjacent modes, followed by abrupt coupling of mode 5–7 energy to nonadjacent modes 8–20, produces enhanced mode coupling and higher received levels downrange of the oceanographic and bathymetric features. Numerical simulations demonstrate that increasing ISW amplitude and seafloor slope enhance the coupling of energy to adjacent and nonadjacent modes. This enhanced coupling is the direct result of the simultaneous influence of the ISW and its proximity to the shelfbreak, and, compared to the individual effect of the ISW or shelfbreak, has the capacity to scatter 2–4 times the amount of acoustic energy from below the thermocline into the upper water column beyond the shelfbreak in realistic environments.The ASIAEX and NLIWI experiments were supported jointly by the National Science Council of Taiwan and the U.S. Office of Naval Research

Dynamic modeling of a dual active bridge DC to DC converter with average current control and load-current feed-forward

Bidirectional power flow is needed in many power conversion systems like energy storage systems, regeneration systems, power converters for improvement of the power quality and some DC-DC applications where bidirectional high power conversion and galvanic isolation are required. The dual active bridge (DAB) is an isolated, high voltage ratio DC-DC converter suitable for high power density and high power applications, being a key interface between renewable energy sources and energy storage devices. This paper is focused on the modeling and control design of a DC-DC system with battery storage based on a DAB converter with average current mode control of the output current and output voltage control. The dynamic response of the output voltage to load steps is improved by means of an additional load-current feed-forward control loop. An analytical study of the load-current feed-forward is presented and validated by means of both simulations and experimental results.This work was supported by the Spanish Ministry of Economy and Competitiveness under grant ENE2012-37667-C02-01.Guacaneme Moreno, JA.; Gabriel Garcerá; Figueres Amorós, E.; Patrao Herrero, I.; González Medina, R. (2015). Dynamic modeling of a dual active bridge DC to DC converter with average current control and load-current feed-forward. International Journal of Circuit Theory and Applications. 43(10):1311-1332. https://doi.org/10.1002/cta.2012S131113324310Vazquez, S., Lukic, S. M., Galvan, E., Franquelo, L. G., & Carrasco, J. M. (2010). Energy Storage Systems for Transport and Grid Applications. IEEE Transactions on Industrial Electronics, 57(12), 3881-3895. doi:10.1109/tie.2010.2076414De Doncker, R. W. A. A., Divan, D. M., & Kheraluwala, M. H. (1991). A three-phase soft-switched high-power-density DC/DC converter for high-power applications. IEEE Transactions on Industry Applications, 27(1), 63-73. doi:10.1109/28.67533Kheraluwala, M. N., Gascoigne, R. W., Divan, D. M., & Baumann, E. D. (1992). Performance characterization of a high-power dual active bridge DC-to-DC converter. IEEE Transactions on Industry Applications, 28(6), 1294-1301. doi:10.1109/28.175280Chang, Y.-H., & Wu, K.-W. (2012). A gain/efficiency-enhanced bidirectional switched-capacitor DC-DC converter. International Journal of Circuit Theory and Applications, 42(5), 468-493. doi:10.1002/cta.1863Li H Liu D Peng FZ Gui-Jia S Small Signal Analysis of A Dual Half Bridge Isolated ZVS Bi-directional DC-DC converter for Electrical Vehicle Applicat 36th IEEE Power Electronics Specialists Conference 2005 2777 2782Chiu, H.-J., Yao, C.-J., & Lo, Y.-K. (2009). A DC/DC converter topology for renewable energy systems. International Journal of Circuit Theory and Applications, 37(3), 485-495. doi:10.1002/cta.475Doishita K Hashiwaki M Aoki T Kawagoe Y Murakami N Highly reliable uninterruptible power supply using a bi-directional converter The 21st International Telecommunication Energy Conference (INTELEC '99), Copenhagen 1999 10.1109/INTLEC.1999.794066Krismer F Biela J Kolar JW A comparative evaluation of isolated bi-directional DC/DC converters with wide input and output voltage range 40th IAS Annual Meeting Industry Applications Conference 2005 1 599 606Aggeler D Biela J Inoue S Akagi H Kolar JW Bi-Directional Isolated DC-DC Converter for Next-Generation Power Distribution - Comparison of Converters using Si and SiC Devices Power Conversion Conference-Nago 2007 510 517Krishnamurthy HK Ayyanar R Building Block Converter Module for Universal (AC-DC, DC-AC, DC-DC) Fully Modular Power Conversion Architecture IEEE Power Electronics Specialists Conference 2007 483 489Romero-Cadaval, E., Spagnuolo, G., Franquelo, L. G., Ramos-Paja, C. A., Suntio, T., & Xiao, W. M. (2013). Grid-Connected Photovoltaic Generation Plants: Components and Operation. IEEE Industrial Electronics Magazine, 7(3), 6-20. doi:10.1109/mie.2013.2264540Yu, X., She, X., Ni, X., & Huang, A. Q. (2014). System Integration and Hierarchical Power Management Strategy for a Solid-State Transformer Interfaced Microgrid System. IEEE Transactions on Power Electronics, 29(8), 4414-4425. doi:10.1109/tpel.2013.2289374Liserre, M., Sauter, T., & Hung, J. (2010). Future Energy Systems: Integrating Renewable Energy Sources into the Smart Power Grid Through Industrial Electronics. IEEE Industrial Electronics Magazine, 4(1), 18-37. doi:10.1109/mie.2010.935861Mi, C., Bai, H., Wang, C., & Gargies, S. (2008). Operation, design and control of dual H-bridge-based isolated bidirectional DC–DC converter. IET Power Electronics, 1(4), 507. doi:10.1049/iet-pel:20080004Friedemann A Krismer F Kolar JW Design of a Minimum Weight Dual Active Bridge Converter for an Airborne Wind Turbine System Proceedings of the 27th Applied Power Electronics Conference and Exposition (APEC) 2012Krismer, F., & Kolar, J. W. (2010). Accurate Power Loss Model Derivation of a High-Current Dual Active Bridge Converter for an Automotive Application. IEEE Transactions on Industrial Electronics, 57(3), 881-891. doi:10.1109/tie.2009.2025284Hengsi Qin, & Kimball, J. W. (2012). Generalized Average Modeling of Dual Active Bridge DC–DC Converter. IEEE Transactions on Power Electronics, 27(4), 2078-2084. doi:10.1109/tpel.2011.2165734Segaran D McGrath B Holmes DG Adaptive dynamic control of a Bidirectional DC-DC converter IEEE Proceedings Energy Conversion Congress 2010 1442 1449Bai H Mi C Wang C Gargies S The dynamic model and hybrid phase-shift control of a dual-active-bridge converter Proceedings IECON 2008 2840 2845Segaran, D., Holmes, D. G., & McGrath, B. P. (2013). Enhanced Load Step Response for a Bidirectional DC–DC Converter. IEEE Transactions on Power Electronics, 28(1), 371-379. doi:10.1109/tpel.2012.2200505Tang W Lee FC Ridley RB Small-signal modeling of average current-mode control APEC'92. Seventh Annual Conference Proceedings 1992 747 755Kheraluwala MH High-Power High frequency DC-DC converters PhD thesis 1991Fang, C.-C. (2011). Sampled-data poles, zeros, and modeling for current-mode control. International Journal of Circuit Theory and Applications, 41(2), 111-127. doi:10.1002/cta.790Redl, R., & Sokal, N. O. (1986). Near-Optimum Dynamic Regulation of DC-DC Converters Using Feed-Forward of Output Current and Input Voltage with Current-Mode Control. IEEE Transactions on Power Electronics, PE-1(3), 181-192. doi:10.1109/tpel.1986.4766303Qin H Kimball JW Closed-loop control of DC-DC dual active bridge converters driving single-phase inverters IEEE Energy Conversion Congress and Exposition (ECCE) 2012 173 17

Pseudomonas aeruginosa sepsis with ecthyma gangrenosum and pseudomembranous pharyngolaryngitis in a 5-month-old boy

Pseudomonas aeruginosa infection that induced pseudomembranous laryngopharyngitis and ecthyma gangrenosum simultaneously in a healthy infant is rare. We reported on a previously healthy 5-month-old boy with initial presentation of fever and diarrhea followed by stridor and progressive respiratory distress. P. aeruginosa sepsis was suspected because ecthyma gangrenosum over the right leg was found at the emergency department, and the diagnosis was confirmed by the blood culture. Fiberscope revealed bacterial pharyngolaryngitis without involvement of the trachea. Because of early recognition and adequate treatment, including antimicrobial therapy, noninvasive ventilation, incision, and drainage, he recovered completely without any complications

Highly Facet-reflection Immune 53GBaud EML for 800G Artificial Intelligence Optical Transceivers

We developed a facet-reflection immune 53GBaud electro-absorption modulated laser (EML) for 800G artificial intelligence (AI) optical network. An ultra-low anti-reflection (AR) coating reflectivity of 2x10-5 has been demonstrated for straight waveguide. Based on Hakki-Paoli method, we characterized the ultra-low AR using the ripple test technique. Such ultra-low AR is critical in achieving excellent eye pattern and optical transmission for 800G AI supercomputing

Hydrogen Production from an Ethanol Reformer Via Thermal Management Over Various Catalysts

AbstractThis study carried out hydrogen production by reforming of ethanol. In this experiment the parameters were, including ethanol supply rate, O2/EtOH (Oxygen/Ethanol molar ratio), catalysts (Fe, Co, Ni, Pt, Pd, Rh and Ru), and the reforming temperature was provided with heat re-circulation, H2+CO concentration were analyzed. First, for this system the commercialized catalysts was adopted to a suitable range of flow rate. The experimental results indicated that the optimal (H2+CO) concentration of 43.41% can be obtained by using rhodium (Rh). Additionally, in this system the reforming performance of Rh and Ru catalysts with energy-saving methods were compared against its original system. The experimental results obtained demonstrated that the conversion efficiency of ethanol, concentration of hydrogen and carbon monoxide, could be enhanced by means of heat insulation and heat recycling. The reforming performance satisfactorily was greater by using Ru catalyst than that by Rh catalyst

106GBaud (200G PAM4) CWDM EML for 800G/1.6T Optical Networks and AI Applications

We report ultrahigh speed 106GBaud (200G PAM4) electro-absorption modulated laser (EML) for 800G and 1.6T optical transmission. Four CWDM EMLs of 1271, 1291, 1311 and 1331nm in 800G FR4 optical transceivers show clear eye diagram after 2km. Our 106GBaud EMLs show high bandwidth, high extinction ratio, low threshold current and high power, making it a suitable source laser for 800G/1.6T and AI applications.&nbsp