http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Variation of Conductivity of Poly(ethylene oxide)Electrolytes with Lithium Salts and Plasticizers
Seong-In Moon,Jong-Uk Kim,Bong-Soo Jin,Hal-Bon Gu,Mun-Soo Yun 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The purpose of this study is to research and develop solid polymer electrolyte (SPE) for Li secondary battery. We investigated the effects of lithium salts, plasticizer addition, temperature dependence of conductivity, electrochemical stability window and impedance spectroscopy of polyethylene oxide(PEO) electrolytes. PEO electrolyte complexed with LiCIO_4 showed the better conductivity than the others. PEO-LiCIO_4 electrolyte, when EO/Li ratio is 8, showed the highest conductivity. By adding propylene carbonate and ethylene carbonate to PEO-LiCIO_4 electrolyte, its conductivity was higher than PEO-LiCIO_4 without those. Also PEO_8LiCIO_4PC3EC5 electrolyte remains stable up to 4.5V.
( Seong Ho Kim ),( Jun Hwa Song ),( Hyun Il Mun ),( Keon Uk Park ) 대한내과학회 2009 The Korean Journal of Internal Medicine Vol.24 No.2
Background/Aims: Acidic saline injections produce mechanical hyperresponsiveness in male Sprague-Dawley rats. We investigated the effect of milnacipran in conjunction with tramadol on the pain threshold in an acidic saline animal model of pain. Methods: The left gastrocnemius muscle of 20 male rats was injected with 100 μL of saline at pH 4.0 under brief isoflurane anesthesia on days 0 and 5. Rats administered acidic saline injections were separated into four study subgroups. After determining the pre-drug pain threshold, rats were injected intraperitoneally with one of the following regimens; saline, milnacipran alone (60 mg/kg), milnacipran (40 mg/kg) plus tramadol (20 mg/kg), or milnacipran (40 mg/kg) plus tramadol (40 mg/kg). Paw withdrawal in response to pressure was measured at 30 min, 120 min, and 5 days after injection. Nociceptive thresholds, expressed in grams, were measured with a Dynamic Plantar Aesthesiometer (Ugo Basile, Italy) by applying increasing pressure to the right or left hind paw until the rat withdrew the paw. Results: A potent antihyperalgesic effect was observed when tramadol and milnacipran were used in combination (injected paw, p=0.001; contralateral paw, p=0.012). This finding was observed only at 30 min after the combination treatment. Conclusions: We observed potentiation of the antihyperalgesic effect when milnacipran and tramadol were administered in combination in an animal model of fibromyalgia. Further research is required to determine the efficacy of various combination treatments in fibromyalgia in humans. (Korean J Intern Med 2009;24:139-142)
Sideband Instability in the Compact THz Free-Electron Laser at KAERI
Young Uk Jeong,Byung Cheol Lee,Grigori M. Kazakevitch,Hyuk Jin Cha,Jungho Mun,Pil Dong Ahn,Seong Hee Park 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
A frequency offset of the Sideband instability has been observed in a compact waveguide-mode terahertz (THz) free-electron laser (FEL). The spectra of the FEL pulses were measured by using a Fabry-Perot spectrometer having a resolution of 10$^{-4}$ of the central wavelength at 2 $-$ 3 THz range. The shift of the sideband was measured to be 0.5 $-$ 1.2 $\mu$m, depending on the FEL wavelengths from 110 to 165 $\mu$m. An increase in the sideband shift for a longer wavelength could be explained by a change in the wave's group velocity in a plane-parallel waveguide. Mode competition between the sidebands and the primary wave was observed by changing the cavity length of the FEL. We could decrease the number of modes and reduce the linewidth of the spectra by controlling the cavity detuning. We discuss the dependence of the complexity of the sideband instability on the FEL wavelengths and its gain characteristics.
Polyamine Stimulation of arcA Expression in Escherichia coli
Rhee, Mun-Su,Kim, Young-Sik,Park, Seon-Young,Park, Myung-Hun,Kim, Bo-Min,Kang, Seong-Uk,Lee, Kui-Joo,Lee, Jong-Ho The Microbiological Society of Korea 2002 The journal of microbiology Vol.40 No.4
The effects of two natural polyamines (putrescine and spermidine) on the synthesis of ArcA, a response regulator of the Arc two-component signal transduction system, were studied using an E. coli mutant deficient in polyamine biosynthesis. Endogenous polyamine deficiency of the mutant resulted in marked reduction in the ArcA level determined by Western blot analysis. Putrescine supplement to the growth medium effectively increased the ArcA level of the mutant in a concentration-dependent manner. Spermidine also stimulated the ArcA level in the mutant to a greater degree than putrescine. Expression of arcA'::lacZ operon fusion in the mutant was stimulated 6-fold and 10-fold by putrescine and spermidine at a 1mM concentration, respectively, indicating that the stimulatory effect of the polyamines on ArcA synthesis is due to transcriptional induction, and that spermidine is a more potent arcA inducer than putrescine. The polyamine-dependent arcA'::lacZ induction was growth-phase-dependent and independent of either arcA or fnr which are two regulators involved in anaerobic stimulation of the Arch level. These results suggested that putrescine and spermidine polyamines may be potential intracellular signal molecules in the control of arcA expression, and thereby may play an important role in cellular metabolism.
Jungho Mun,Young Uk Jeong,Byung Cheol Lee,Hyuk Jin Cha,Ji Young Lee,Kitae Lee,Kwon-hae Yea,Pil Dong Ahn,Seong Hee Park,Yong Ho Cha,Yong Woo Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
Terahertz (THz) pulses from solid targets, such as an aluminum (Al) and a strong polyester film (Mylar), irradiated by ultra-intense laser pulses were measured by using a liquid-helium-cooled Ge:Ga detector. The irradiating intensity of the Ti:Sapphire laser was more than 10$^{18}$ W/cm$^2$. The typical pulse energy and pulse duration on the target were 200 mJ and 30 fs, respectively. To prevent ultraviolet (UV), visible, and near-infrared (NIR) radiation from being measured by the detector, we used polyethylene (PE) plates and indium-tin-oxide (ITO) films as selective windows and mirrors for the THz radiation. The reflectivity of the ITO film for THz radiation is 10 times higher than that for visible and NIR radiations. The THz wave radiated from a laser-induced plasma has a linear component of the polarization, which may be explained by linear mode conversion from a laser wakefield. This intense and wide-band radiation is expected to be a useful source for various THz applications, as well as for real-time diagnostics for a plasma in which particles are accelerating.
Design of Brushless DC Motor Controller for an Electric Wheelchair
Jun-Uk Chu,In-Hyuk Moon,Gi-Won Choi,Jei-Cheong Ryu,Mu-Seong Mun 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2004 International Journal of Assistive Robotics and Me Vol.5 No.3
We introduce a design and implementation of brushless DC (BLOC) motor controller for an electric wheelchair. The control architecture consists of two layers of feedback control, namely the wheelchair posture control and the wheel velocity control. In the higher level of control architecture, the posture controller works as a reference velocity generator for the two wheels. We realize the joystick interface and the posture controller in an 8-bit microcontroller. It is on the lower layer that the velocity controller performs four quadrant operations. For the driving system, a DSP-based BLDC motor controller with three-phase inverter module is especially designed using only three Hall-effect sensors and a single dc-link current sensor. The functions of this motor controller include wheel velocity control and torque control. The performance of the control system has been verified experimentally.
김문섭(Kim, Mun Sup),최승필(Choi, Seung Pil),김준성(Kim, Jun Seong),김욱남(Kim, Uk Nam) 한국측량학회 2011 한국측량학회 학술대회자료집 Vol.2011 No.4
Terrestrial LiDAR can be used to accurately measure the 3D slope terrain because it can obtain the entire shape of the object, instead of only a specific location, while not much influenced by the environment, and it can create more dense and precise 3D coordinates than those of aerial LiDAR. Therefore, in this study, model slope with different observing conditions were selected, the terrestrial LiDAR was used to observe the model slope, and a model slope interpretation technique was proposed based on the observation results.