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Subacute oral toxicity of Dendropanax morbiferus H.Lév leaf extracts in Sprague-Dawley rats
Jiyong Park(Jiyong Park),Chang-Soo Cho(Chang-Soo Cho),Jun-Ho Song(Jun-Ho Song),Kwang Il Park(Kwang Il Park),Yeung Bae Jin(Yeung Bae Jin),Woo Hyun Kim(Woo Hyun Kim),Suk Kim(Suk Kim),Hu-Jang Lee(Hu-Jang 한국예방수의학회 2023 예방수의학회지 Vol.47 No.1
This study examined the subacute oral toxicity of Dendropanax morbiferus H.Lév leaves hot-water extracts (DMWE) using male and female Spargue-Dawley rats. Rats were orally administered the DMWE at dose levels of 0, 250, 500, 1,000, and 2,000 mg/kg body weight (BW) for four weeks. For experimental period, clinical signs and the number of deaths were examined, and feed intake and BW of all experimental animals were measured once a week for four weeks. At the end of the experiment, blood samples were collected from all rats, and all animals were euthanized and autopsies were performed to collect major organs. No dead animals were found during the experimental period. In addition, no differences were found between control and DMWE-treated groups in feed intakes, BW changes, organ weights, clinical signs, hematological parameters, and serum biochemical parameters. The results of this study provided evidence that oral administration of DMWE at the dose of 2,000 mg/kg BW is safe in rats and may not exert severe toxic effects.
Hybrid mode-locked Er-doped fiber femtosecond oscillator with 156 mW output power.
Kim, Seungman,Kim, Yunseok,Park, Jiyong,Han, Seunghwoi,Park, Sanguk,Kim, Young-Jin,Kim, Seung-Woo Optical Society of America 2012 Optics express Vol.20 No.14
<P>We report on an Er-doped fiber oscillator that produces 146 fs pulses with 156 mW average power at a repetition rate of 49.9 MHz. The pulse energy reaches 3.13 nJ, surpassing the conventional power limit in the dispersion-managed soliton regime. Such high pulse power is obtained by devising a hybrid mode-locking scheme that combines saturable absorption with nonlinear polarization evolution. The oscillator also offers excellent temporal purity in the generated pulses with high power, providing a robust fiber-based frequency comb well suited for industrial uses.</P>
Jiyong Kim,Jungho Kim,Kyoung-Youm Kim 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.11
We propose the Poynting vector analysis of the air mode in a top-emitting organic light-emitting diode (OLED) by combining the transfer matrix method and dipole source term. The spatial profiles of the time-averaged optical power ow of the air mode are calculated inside and outside the multilayer structure of the OLED with respect to the thickness of the semi-transparent top cathode and capping layer (CPL). We elucidate how the micro-cavity effect controlled by the thickness variation of the semi-transparent top cathode or CPL affects the internal optical power and absorption loss inside the OLED multilayer and the external optical power coupled into the air. When the calculated absorption loss and external power obtained by the proposed Poynting vector and currently-used point dipole models are compared, two calculation results are identical, which demonstrates the validity of the two models.
Kim, Jiyong,Kang, Kyungnam,Kim, Kyoung-Youm,Kim, Jungho IOP Publishing 2018 Japanese journal of applied physics Vol.57 No.1
<P>We theoretically investigate the origin of the sharp spectral peak near the critical angle in the spectral power density profile of a top-emitting organic light-emitting diode (OLED). On the basis of the point dipole model, spectral power densities of the top-emitting OLED are calculated with respect to the thickness of the capping layer (CPL). Sharp peaks in the spectral power density profile are observed at certain CPL thicknesses near the spectral interface between the radiation-and waveguide-mode regions, which is determined by the critical angle. By calculating the waveguide-mode spatial profile, the sharp peak in the spectral power density profile is identified as the radiation-mode-like waveguide mode, which has a very large evanescent length near the cut-off condition of waveguide modes. By decomposing the total spectral power density into the out-coupled light and absorption loss components, we demonstrate that the sharp spectral peak near the critical angle can enhance the relative power contribution of the absorption loss. (C) 2018 The Japan Society of Applied Physics</P>
HSTR(Hongik Squeal Test Rig) 이용한 스킬 소음의 실험적 특성 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Kim),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.