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Optimal Operation of Smart Grid with Fuel Cell in Isolated Islands
Kinjy, Yoshihisa,Asato, Bungo,Yona, Atsushi,Senjyu, Tomonobu,Funabashi, Toshihisa,Kim, Chul-Hwan The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.4
From the perspective of global warming suppression and depletion of energy resources, renewable energy such as wind generation (WG), photovoltaic facility (PV) and fuel cell (FC) are getting attention in distribution systems. On the other hand, the usage of an all-electrification house is increasing in the world. So the controllable loads such as electric water heater, heat pump, and electric vehicles are introduced to the power system. In addition, the controllable load could accomplish to shift the peak demand in daytime to the low demand in nighttime and it is effective method for leveling the load and upgrading the load factor. The authors propose an optimization approach to determine operational planning of WG, PV facility, diesel generator (DG), battery energy storage system (BESS), FC and hydrogen generation facility. In this optimization approach, it is assumed that forecasted data of wind speed, solar insolated, and load demands are available. The proposed method uses tabu search and genetic algorithm for optimization method. Optimizing procedure is divided into two parts. Firstly, actual load is controlled by controllable load. Secondly, the schedule of diesel generator units commitment problem is decided in the revised load. The simulation results show the reduction of operational cost.
Factors Affecting Stretching Limits of Aluminum Sheet
Sato, Kinji,Sawa, Yoshiaki,Abe, Yuhji,Yokoyama, Toshio,Kagawa, Hotsumi 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.6
The purpose of the present paper is to study methods to improve the stretching limit of metal sheet. The factors affecting the stretching limit were sheet thickness, blank diameter, blank holding pressure, and forming rate. Punch radius, die radius, and clearance between a punch and a die were retained constant. Tested materials were softened and half hardened types of aluminum sheet. The effect of lubrication was also studied. Lubricants used were a press working ail and graphite. Stretching by two types of punch shape, a spherical head punch and a truncated cone one, was tried in order to research the effect of punch shape. The half hardened aluminium, which has a larger n-value, showed the larger stretching limit. The larger thickness gave rise to the larger stretching limit. Flow characteristic of materials was poorer in larger diameter of a blank, so its stretching limit was lower. A bit lower holding pressure, which allows drawing of materials to some extent, yielded larger stretching limit than rigid holding. The forming rate did not so much affect stretching limit. Concerning the effect of lubrication, applied position of lubricants was important.
Kyohei Yasuno,Junichi Kamiie,Kinji Shirota 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.2
The renal glomeruli of 12 male Osborne-Mendel (OM) rats 3to 24 weeks old were examined by electron microscopy. Effacement of podocyte foot processes (FPs) developed at 3weeks of age and became progressively worse over time. Loss or dislocation of the slit membrane was also found. Vacuoles and osmiophilic lysosomes appeared in the podocytes starting at 6weeks of age. Podocyte detachment from the glomerular basement membrane (GBM) was apparent at 18 weeks of age. Laminated GBM was occasionally observed in all animals. These features might lead to the development of spontaneous proteinuria and glomerulosclerosis in OM rats.
고등어 저장중 염분농도와 저장온도에 따른 Adenosine Triphosphate 관련물질 및 유리아미노산의 변화
禹敬子,遠藤金次 동아시아식생활학회 1996 동아시아식생활학회지 Vol.6 No.1
The effects of salt and temperature on changes of K value, IMP, free amino acids and histamine concentration in Makerel muscle during storage were examined. The content of salt was 0, 3, 5 and 10% and storage temperature was at 0, 8, 16 and 20℃, 1. Content of IMP was 607.3㎎% in raw material and as storage temperature was decreased and as salt content was increased, the rate of decrease in IMP was slow. 2. K value of raw material was 14% and rapidly increased as temperature increased and salt content decreased. 3. The time required to reach at 50% in K value was 13.6~16.6 days at 0℃ and 1.4~3.3 days at 20℃, in 0~10% salt content. 4. Except taurine and histidine, the contents of all free amino acids were slowly increased during storage at 0℃ and in high salt content but at 20℃ and in 0% salt they were more rapidly increased. The contents of Ala., Glu., Val., Leu., Lys., and NH₃were rapidly increased than the contents of Phe., Gly, and Ile. 5. Taurine and histidine were rapidly decreased at high temperature and in 0% salt during storage. 6. The storage condition which produced more than 100㎎% in histamine was 3 days at 16℃ (180㎎%) and 20℃ (443.5㎎%) in 0% salt and was 10days (163.1㎎) at 16℃ in 3% salt.
Evaluation of DC Brush-less Motors Using Powder Magnetic Cores
Mori Katsuhiko,Nakayama Ryoji,Kanagawa Kinji 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We made a high-speed motor and a DC brush-less motor for factory automation (FA) to investigate applicability of powder magnetic core to motor application, and compared those performances with the similar motors having conventional electro magnetic steel core. Permeability and saturated magnetization of powder magnetic core are less than those of elect romagnetic steel core, however output performances of each core motor are almost the same. The FA motor with powder magnetic core using three-dimensional magnetic circuit showed higher torque than the same volume motor with electromag netic steel core.
GLOBAL OCEAN STATE EATIMATION BY 4D-VAR DATA ASSIMILATION USING SATELLITE DATA
Awaji, Toshiyuki,Sugiura, Nozomi,Baba, Kinji,Masuda, Shuhei,Horiuchi, Kazutoshi,Jiang, Qin.,Ishikawa, Yoichi,Toyoda, Takahiro,Komori, Nobumasa 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
By using a free-surface ocean general circulation model and the variational adjoint method, our joint group has constructed a global ocean data assimilation system capable of providing a comprehensive 4-dimensional dataset from many of the available observational data such as satellite data and thereby estimating ocean circulation processes with high accuracy and good dynamical consistency. The system was applied to an experiment to define the climatological seasonal state of a global ocean. The result showed the efficiency of our assimilation system in reproducing the detailed features similar to those of ocean circulations reported so far. For example, a low salinity distribution associated with the North Pacific Intermediate Water is reproduced much better than in other simulations. The accuracy of estimated heat and freshwater fluxes is also better than that by the flux correction method currently used in most of ocean-atmosphere coupled models. These results suggest that our data assimilation system is a very powerful tool for ocean climate researches.
Akihiro Hachikubo,Koutarou Yamada,Taku Miura,Kinji Hyakutake,Kiyoshi Abe,Hitoshi Shoji 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.3
The processes of formation and dissociation of gas hydrates were investigated by monitoring pressure and temperature variations in a pressure cell in order to understand the kinetic behavior of gas hydrate and the controlling factors for the phase transition of gas hydrate below freezing. Gas hydrates were made from guest gases (CH4, CO2 and their mixed-gas) and fine ice powder. We found that formation and dissociation speeds of gas hydrates were not controlled by temperature and pressure conditions alone. The results of this study suggested that pressure levels at the formation of mixed-gas hydrate determine the transient equilibrium pressure itself.