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Obi Stephen Arinze(스티븐),Jae-Jung Jung(정재정) 전력전자학회 2024 전력전자학술대회 논문집 Vol.2024 No.7
This review article explores the stability of digitally controlled grid-connected converters operating under varying grid or interconnection impedance. Due to global decarbonization policies and drives, renewable energy sources are becoming more integrated into the grid. Rising integration has resulted in a more complex and interconnected power system. This has caused the stability of grid-connected converters to be a critical issue, particularly since the continuous decommissioning of traditional synchronous generators (SGs) weakens the grid infrastructure. Interconnecting converters employ mostly digital control because it offers enhanced flexibility and precision in managing power flow. However, their harmonic stability under challenging grid conditions warrants careful examination. This article evaluates the stability challenges encountered by digitally controlled gridconnected converters in varying interconnection impedance environments.
Obi, T.,Matsumoto, M.,Miyazaki, K.,Kitsutaka, K.,Tamaki, M.,Takase, K.,Miyamoto, A.,Oka, T.,Kawamoto, Y.,Nakada, T. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.9
Comparisons of properties between skeletal ryanodine receptor 1 (sRyR1)-heterozygous-mutated and normal types of meat were carried out in pigs using PSE (pale, soft and exudative) meat found during the butchering process. All samples considered to be PSE meat showed irregular running and disorder of the muscle fibers and a wider inter-fiber space upon light microscopic observation. Electron microscopy revealed disintegration, twisting, and disorder of the myofibril arrangement and elimination of the Z line in PSE meat, compared with normal meat. Meat property tests demonstrated greater decreases in water holding capacity, moisture and sarcoplasmic protein, and higher $L^*$ values for the meat color index in PSE meat than in normal meat, but there were no differences in these factors between genetically normal and sRyR1-heterozygous PSE meat. On the other hand, higher $a^*$ and $b^*$ values were observed in sRyR1-heterozygous than in normal PSE meat, and similar alterations to the a* value were observed in terms of the amount of myoglobin and density of the 17-kDa protein band, corresponding to the molecular mass of myoglobin, on SDS-PAGE gels. These results suggest that sRyR1-heterozygous PSE pork contains much more myoglobin than genetically normal PSE meat.
C Pat Obi People&Global Business Association 2003 Global Business and Finance Review Vol.8 No.2
This study examines secular trends in the pricing of the euro and the prospects of the new European currency to compete with the U.S. dollar in denominating international assets. The global importance of crude. oil as the world's largest cash commodity provides a basis to evaluate the short- and long-run dynamics of the value of the euro vis-à-vis crude oil price as well as stock market and interest rate variables. Variance decompositions show that innovations in oil price and U.S. interest rates explain most of the intertemporal variations of the euro. Conversely, the contribution of the euro to oil price volatility is marginal especially after European stock market effects have been accounted. Notwithstanding, a long-run positive trend seems to exist between oil price and euro as evidenced by their impulse response functions.
THE COMPARATIVE STATICS OF YIELD SPREAD AND EXCHANGE RATES
C Pat Obi People&Global Business Association 2000 Global Business and Finance Review Vol.5 No.1
This paper investigates how changes in the U.S. yield spread influence the direction of exchange rates. Additionally, it determines whether possibilities for abnormal gains exist in the international monetary market around periods of monetary policy pronouncements by the Federal Reserve Board of the United States. The latter inquiry is pursued only when a secular relationship is seen to exist between the term structure of interest rates and exchange rates. Yield spread is the difference between long bond yield and money market yield. Empirical evidence shows that the British pound sterling maintains a secular relationship with yield spread. This relationship however, is not sufficient to provide opportunities for consistent abnormal returns to speculative investors wishing to capitalize from exchange rate aberrations.