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박선재,이화석,김찬인,박종후,전희종,염정덕 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3
As a result of the depletion of fossil fuels and environmental contamination, it has become important to use renewable energy. For the stable utilization of renewable energy sources, energy storage devices must be used. In addition, renewable and distributed power sources with energy storage devices must operate stably under grid-connected mode. This paper proposed dynamic response modeling for renewable power generation systems including a charger/discharger with an energy storage device in order to derive a method to guarantee stable operation while fully utilizing the energy from the energy storage device. In this paper, the principle operation and design guidelines of the proposed scheme are presented, along with a performance analysis and simulation results using MATLAB and PSIM. Finally, a hardware prototype of a 1kW power conditioning system with an energy storage device has been implemented for experimental verification of the proposed converter system.
韓國 落葉松材의 木質세멘트板 材質에 미치는 前處理 및 添加劑 效果
朴鍾瑩,李華珩 충남대학교 농업과학연구소 1982 農業技術硏究報告 Vol.9 No.1
The Larch was known unsuitable species for the wood cement board owing to its some inhibitory substances. Therefore this research was carried out to evaluate the effect of pretreatments and chemical additives on the properties of woodflake cement board from Japanese larch (Larix leptolepis) grown in Korea. In order to improve the board qualities, the woodflakes were treated by cold water or dilute NaOH solutions (0.1, 0.5, and 2.0%), and. also some chemicals (CaCl₂, AI₂Cl₂, and Na₂SiO₄) added to the wood cement mixture. The results obtained are summarized as follow; 1. The wood cement boards from the woodflake treated with 0.1% NaOH showed remarkably higher bending strengths and internal bonding strengths than those from the flake pretreated with cold water. 2. The bending strengths showed over 60kg/㎠, i. e. the standard strength of JIS A-5417, with pretreatments of NaOH over 0.1% and additive of CaCl₂ 3.0%. The maximum strengths showed at about 0.5% of every additives. 3. Addition of CaCl₂, and Al₂Cl₂, in the case of pretreated wood with NaOH above 0.1%. had effects on increasing the internal bonding strengths of sample boards. 4. The thickness swellings became decreasing along with the increasing NaOH pretreatment concentntration. 5. The equilibrium conditions of the sample boards pretreated with NaOH over 0.1% and added with Al₂Cl₂, and CaCl₂ were maintained at 9.0∼10.5% moisture contents. 6. The specific gravity of the samples showed close relationships with strength properties.
이화조,주해호,박영찬 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
In this thesis, a method has been developed to evaluate a disassembly time of a product. Some factors regards to affects disassemblibility are found by experiment and the value of disassembling time of elements and the computation formular are delived by using WF(work factor) method. The evaluated disassembling times are compared with real disassembling times of recyclable products, a desk toy computer case.