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Wireless Energy Transfer System with Multiple Coils via Coupled Magnetic Resonances
Sanghoon Cheon,Yong-Hae Kim,Seung-Youl Kang,Myung-Lae Lee,Taehyoung Zyung 한국전자통신연구원 2012 ETRI Journal Vol.34 No.4
A general equivalent circuit model is developed for a wireless energy transfer system composed of multiple coils via coupled magnetic resonances. To verify the developed model, four types of wireless energy transfer systems are fabricated, measured, and compared with simulation results. To model a system composed of n-coils, node equations are built in the form of an n-by-n matrix, and the equivalent circuit model is established using an electric design automation tool. Using the model, we can simulate systems with multiple coils, power sources, and loads. Moreover, coupling constants are extracted as a function of the distance between two coils, and we can predict the characteristics of a system having coils at an arbitrary location. We fabricate four types of systems with relay coils, two operating frequencies, two power sources, and the function of characteristic impedance conversion. We measure the characteristics of all systems and compare them with the simulation results. The flexibility of the developed model enables us to design and optimize a complicated system consisting of many coils.
Wireless power transfer using resonance with small resonator
김용해(Yong-Hae Kim),강승열(Seung-Youl Kang),전상훈(Sanghoon Cheon),이명래(Myung-Lae Lee),윤재훈(Je-Hoon Yun),조인귀(In-Kui Cho),문정익(Jung-Ick Moon),김성민(Seong-Min Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
We investigate the wireless power transmission characteristics through resonant coupling using small resonator. To reduce the device's size, we used the 4-layer PCB resonator for the sending part. As the geometry of resonator is reduced, the impedance matching becomes more important. By tuning the power coil's length, we can succeed to obtain the reflection free condition.
Jae-Won Choi,Hae-Kag Lee,Jae-Hwan Cho,Cheon Woong Choi,Myung Sik Ju,Bok Soon Chang,Cheol-Soo Park 한국자기학회 2017 Journal of Magnetics Vol.22 No.1
This paper uses a glass dosimeter to evaluate the lens-absorbed dose of scattered radiation generated in tomotherapy intensity modulated radiation therapy (IMRT). The head and neck portion of the rando phantom was subjected to a CT scan. The tomotherapy plan was designed to ensure delivery of the prescribed total 70 Gy day 2.2 Gy. With the lens portion of the glass dosimeter, a 5mm bolus was subjected to the scattered radiation treatment, and the dose was measured in each of the three megavoltage CT (MVCT) modes. The result is multiplied by 30 times and was determined once as the mean value. The measurement at the MVCT Coarse mode is RT mode 10.797 mGy, that for the Normal mode is 13.360 mGy, for the Fine mode is a maximum of 22.872 mGy, and for the treatment mode is 895.830 mGy. A small amount of scattered radiation in the MVCT is measured in the lens scattered radiation, but scattered radiation during treatment was measured to be near 1 Gy on the lens. Compared to a one-time radiation treatment of 2.2 Gy, the survey showed something unexpected in that it was half the value of that research to the patient. Therefore, will be aware of how much of an influence there will be on sensitive organs, such as the lens by scattered radiation generated during intensity modulated radiation therapy.
페프린트배선기판(PCBs)과 폐범퍼의 열분해 및 연소 특성에 관한 연구
류경옥,김명수,김희택,이해평,류한응,오세천,이봉한,권우택 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
폐프린트배선기관(PCBs)과 폐범퍼의 열분해 및 연소특성에 관한 연구를 TG, GC-MS 및 FT-IR을 이용하여 수행하였다. 열적 분해반응의 속도상수에 대한 정보를 얻기 위하여 질량감소 곡선 및 그 미분값을 Flynn-Wall, Coats-Redfern 및 Ozawa 방법을 이용하여 해석하였다. 속도론적 연구결과로부터 폐범퍼의 겉보기 활성화에너지 값은 질소분위기에서 보다 공기분위기에서 더 낮은 값을 보여주었으며 반면에 PCBs의 경우 분위기에 따라 겉보기 활성화 에너지 값에 거의 변화가 없음을 알 수 있었다. 생성물의 특성 분석으로부터 PCBs 와 폐범퍼의 열분해 및 연소로부터 생성된 물질은 주로 가스 성분이었으며 산소의 농도가 증가함에 따라 잔류물의 함량은 줄어들었다. 그리고 액상 생성물의 방향족 화합물 성분은 온도가 감소함에 따라 Diels-Alder반응에 의한 에텐 및 부타디엔 등과 같은 기상 생성물의 재중합으로 인하여 증가하였다. 또한 연소후 생성된 잔류물의 재활용 가능성을 확인하기 위하여 PCBs로부터의 잔류물에 대한 표면적과 adsorption total pore volume을 측정하였다. The pyrolysis and combustion characteristics of printed circuit boards(PCBs) and waste bumper have been studied by using thermogravimetry(TG), gas chromatograph-mass spectrometry(GC-MS) and fourier transform infrared spectroscope(FT-IR). To obtain the information on the kinetic parameters of thermal decomposition of PCBs and waste bumper, the dynamic thermogravimetric analysis curve and its derivative have been analyzed by Flynn-Wall, Coats-Redfern and Ozawa methods. From the kinetic analysis, the apparent activation energies of waste bumper in air atmosphere are lower than those in nitrogen atmosphere while the apparent activation energies of PCBs are little effected by atmosphere. From the products analysis, the products from the pyrolysis and combustion of PCBs and waste bumper are mainly composed of gaseous products. As the concentration of oxygen increases, an decreasing tendency of the yield of residue from PCBs is observed. The aromatic compounds of liquid product increase as decreasing the temperature because the gas product such as ethene, propene and butadiene are combined by the Diels-Alder reaction. To verify the possibility for the recycling of residue from pyrolysis and combustion, the resulting residue of PCBs has been analyzed for their surface area and adsorption total pore volume.