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| 1 | 急性特发性阴囊水肿的急诊超声表现显示文摘本研究对急性特发性阴囊水肿(AISE)的超声表现进行评价,以明确诊断特征,可有助于避免不必要的外科干预。12例根据临床经过与超声表现诊断为AISE的男孩被纳入研究,对阴囊壁的厚度、可压缩性及富血管的程度,水肿范围,腹股沟淋巴结(LN)肿大、形态、大小及其富血管程度进行评价。 | A.Lee S.J.Park H.K.Lee H.S.Hong B.H.Lee D.H.Kim 王鹤 | 2009 | 国际医学放射学杂志2009，32，5： | 1 |
| 2 | A Study of Power Loss for 3 Phase Voltage Source Converter of Elevator显示文摘In this paper,to study the power loss of converter for elevator,The analysis is to establish relationship between parameters(current,voltages and losses in the inverter and converter) relevant for sizing of major components of the drive was done.) For high PWM(pulse width modulation) frequency like in elevator applications of fpwm =10kHz,switching losses are dominant and are about 2/3 of the total losses on IGBT switch.Transition from continuous 3 phase to discontinuous 2 phase PWM results in 50% reduction of switching loses on IGBT devices providing that PWM is not done over 60deg angle in a particular phase when current has maximum value.Total losses on IGBT(conduction + switching) are reduced approximately by ~1/3 what is still a significant reduction.Two phase PWM with reduced losses can be used for applications when acoustic noise due to increased current ripple is not significant and fall back solution to regular 3 phase PWM when drive operates under rare extreme conditions resulting in increased heat sink temperature.The analysis will be examined by further laboratory testing simulating 60% duty cycle on a dynamometer. | S.E.Cho S.J.Park | 2013 | 科技信息2013，，3： | 0 |
| 3 | A study on low emittance injector and undulator for PAL-XFEL显示文摘For the success of PAL-XFEL, two critical systems, namely a low emittance injector and a variable gap out-vacuum undulator, are under development. In order to realize the target emittance of the PAL-XFEL injector we carried out an optimization study of various parameters, such as the laser beam transverse profile, the laser pulse length, the laser phase,and the gun energy. The transverse emittance measured at the Injector Test Facility(ITF) is εx=0.48±0.01 mm mrad.An undulator prototype based on the EU-XFEL design and modified for PAL-XFEL was built and tested. A local-K pole tuning procedure was developed and tested. A significant reduction(90%) of the local-K fluctuation was observed. The requirement of undulator field reproducibility better than 2×10-4and the undulator gap setting accuracy below 1 μm were achieved for the prototype. The optical phase jitter after the pole height tuning at the tuning gap was calculated to be 2.6? rms, which satisfies the requirement of 5.0?. | J.Hong J.-H.Han S.J.Park Y.G.Jung D.E.Kim H.-S.Kang J.Pflueger | 2015 | High Power Laser Science and Engineering2015，3，3： | 0 |
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