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양인형,신지애,조성대 대한암예방학회 2014 Journal of cancer prevention Vol.19 No.4
Background:Pycnogenol is extracted from the pine bark of a tree known as Pinus pinasterthat has variety biological effects. However,its anticancer activity has not yet been completely studied. The aim of this study is to investigate anticancer effect of pycnogenol inMC-3 human mucoepidermoid carcinoma (MEC) cell line. Methods:We describe the effect of anti-cancer of pycnogenol in MC-3 human oral MEC cells using trypan blue exclusion assay,3-(4,5-dimethylthiazol-2-yl)-(3-carboxymethoxyphenyl)-2-(4-sulphophenyl)-2H-tetrazolium (MTS) assay, Western blot, preparation ofcytosolic and nuclear fractions, immunocytochemistry and reverse transcriptase polymerase chain reaction. Results:Pycnogenol significantly decreased cell viability and also induced caspase-independent apoptosis. We confirmed that pycnogenolinduced the translocation of apoptosis-inducing factor into nucleus and regulated apoptosis. Also, Bak protein stability was partly enhancedby pycnogenol to elevate the expression level of Bak protein. Conclusions:Overall, pycnogenol may be a fascinating therapeutic drug candidate for the treatment of MEC.
Magnetic-field-dependent Shear Modulus of a Magnetorheological Elastomer Based on Natural Rubber
양인형,윤지현,정재은,정운창,김진수,정경호,오재응 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.2
A magnetorheological elastomer (MRE) is a smart material that has a reversible and variable modulus in a magnetic field. Natural rubber, which has better physical properties than silicone matrices, was used as a matrix in the fabrication of the MREs used in this study. Carbonyl iron powder (CIP), which has a rapid magnetic reaction, was selected as a magnetic material to generate the magnetic-field-dependent modulus in the MREs. The MRE specimens were cured in an anisotropic mold, which could be used to induce a uniaxial magnetic field via permanent magnets, to control the orientation of the CIP, and the shear modulus of the MREs was evaluated under a magnetic field induced by using a magnetic flux generator (MFG). Because the use of a conventional evaluation system to determine the magnetic-field-dependent shear modulus of the MREs was difficult, an evaluation system based on single degree-of-freedom vibration and electromagnetics that included an MFG, which is a device that generates a magnetic field via a variable induced current, was designed. An electromagnetic finite element method (FEM) analysis and design of experiments (DoE) techniques were employed to optimize the magnetic flux density generated by the MFG. The optimized system was verified over the range to determine the magnetic flux density generated by the MFG in order to use a magnetic circuit analysis to identify the existence of magnetic saturation. A variation in the shear modulus was observed with increasing CIP volume fraction and induced current. The experimental results revealed that the maximum variation in the shear modulus was 76.3% for 40 vol% CIP at an induced current of 4 A. With these results, the appropriate CIP volume fraction, induced current, and design procedure of the MFG can be proposed as guidelines for applications of MREs based on natural rubber.
주행 차량의 로드 노이즈 예측을 위한 각 입력원의 기여도 평가
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),윤지현(Yoon, Ji-Hyun),오재응(Oh, Jae-Eung) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.11
The reduction of the vehicle interior noise has been the main interest of noise and vibration harshness(NVH) engineers. A passenger vehicle has various and complicated transmission paths of sound and vibration. In order to identify the mechanism of transfer path, estimation of excitation force and exact modeling of transfer path are required. This paper presents method for estimating the noise source contribution on the road noise of the vehicle in a multiple input system where the input sources may be coherent with each other. And vector synthesis technique is employed to identify the characteristics of road noise and its transmission to vehicle compartment through noise and vibration analysis. Vibration reduction efficiency of each transfer path is evaluated by comparing individual vector components obtained virtual simulation.
벡터합성법을 이용한 차량 실내소음의 입력원 영향도 평가
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),오재응(Oh, Jae-Eung) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.6
A passenger vehicle has various and complicated transmission paths of sound and vibration. In order to identify the mechanism of transfer path, estimation of excitation force and exact modeling of transfer path are required. In this paper vector synthesis technique is employed to identify the characteristics of road noise and its transmission to vehicle compartment through noise and vibration analysis. Vibration reduction efficiency of each transfer path is evaluated by comparing individual vector components obtained virtual simulation. The degree of effect is used to estimate the contribution of vibration input components to total output. And in this paper presents a new technique based on simulation studies using vector synthesis diagram and design of experiments, by which the effects of magnitude and phase change of input paths can be predicted.
다차원 스펙트럼 해석법을 이용한 PDP TV의 저소음화
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),곽형택(Kwak, Hyung-Taek),오재응(Oh, Jae-Eung) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.1
The method is introduced for estimating the noise source contribution on the noise of PDP TV in a multiple-input system where the input sources may be coherent with each other. By the coherence function method, it is found that the biggest part of the noise source in the PDP TV noise is generated by the PCB boards which consume high power and produce high heat. This analysis is modeled as three-input/single-output system because the noise is generated by three main boards, X-board, Y-board, SMPS that are located close to each other. The coherence function method is proved to be useful tool for identifying of noise source. In this study, Transfer Path Analysis using MDSA is implemented to determine the quantitative noise contribution of each board for PDP TV with the rear case closed and with the rear case open. And the possibility of noise reduction is confirmed through the experimental method that isolates the most contributing board by adding sound-absorbing materials to it.