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허광삼,문성익,김흥수,양두영 濟州大學校 産業技術硏究所 2001 산업기술연구소논문집 Vol.12 No.1
This paper deals with designing the mobile station power amplifier of IMT-2000 using analog predistortion method. The power amplifier made up of 3-stage class-AB amplifiers in cascade. By choosing the final stage as the balanced structure. the output linearity is enhanced. The balanced structure of amplifier is composed of the Wilkinson power divider and combiner. Therefore. to compensate for the linearity of the power amplifier. pre-distorter circuit is inserted in front of 3-stage amplifier. The pre-distorter is implemented using parallel Schotty diode. The optimized linear power amplifier is cornposed of these pre-distorter and 3-stage power amplifier.
허광삼,문성익,김홍수,양두영 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1
This paper deals with designing the mobile station power amplifier of IMT-2000 using analog predistortion method. The power amplifler made up of 3-stage class-AB amplifiers in cascade. By choosing the final stage as the balanced structure, the output linearity is enhanced. The balanced structure of amplifier is composed of the Wilkinson power divider and combiner. Therefore, to compensate for the linearity of the power amplifier, pre-distorter circuit is inserted in front of 3-stage amplifier. The pre-distorter is implemented using parallel Schotty diode. The optimized linear power amplifier is composed of these pre-distorter and 3-stage power amplifier.
허광삼,문성익,양두영 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.2
This paper deals with designing the linear power amplifier using MESFET and Schottky diode. The power amplifier is designed to be ensure 3-W linear output using MESFET. and made up of 3stage class-AB amplifiers in cascade. By choosing the final stage as the balanced structure. the output linearity is enhanced. The balanced structure of amplifier is composed of the Wilkinson power divider and combiner. In the designed 3-stage amplifier. when the input power is lower than -5dBm. power gain is 38dB. And it rapidly decreases as the input power increases larger than -5dBm. Therefore. to compensate for decreasing the gain. pre-distorter circuit is inserted in front of 3stage amplifier. The pre-distorter is implemented using parallel Schottky diode. The optimized linear power amplifier is composed of these pre-distorter and 3-stage power amplifier. As a result. when the maximum input power is 9dBm. the 1-dB gain compression point of linear power amplifier. P_(ldB). is 37.61dBm
문성익,허광삼,김윤영,양두영 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1
In this paper, the T-junction branch network of the orthomode transducer is analyzed. The T-junction blanch network consists of the cylindrical common waveguide and the rectangular sub-waveguide. Using the vector potential of each region, the hybrid mode is considered. Based on the derived electromagnetic components, scattering parameters of the T-junction branch network are calculated. The cylindrical waveguide size and the rectangular waveguide size are WR62 and WC55. In order to analyze the discontinuity of the T-junction branch network, high order mode of the branch region is considered the 15th. From the results, the transmission coefficient. S31 and S21 show -3dB, the reflection coefficient, S11 and S33 are -10dB, -8dB in the range of 13.3GMz∼16GHz.
문성익,김윤영,허광삼,양두영 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1
In this paper, the T-junction branch network of the orthomode transducer is analyzed. The T-junction branch network consists of the cylindrical comnion waveguide and the rectangular sub-waveguide. Using the vector potential of each region. the hybrid mode is considered Based on the derived electromagnetic components. scattering parameters of the T-junction branch network are calculated. The cylindrical waveguide size and the rectangular waveguide size are WR62 and WC55. In order to analyze the discontinuity of the T-junction branch network. high order mode of the branch region is considered the 15th. From the results. the transmission coefficient. S_(31) and S_(21) show -3dB. the reflection coefficient. S_(11) and S_(33) are -10dB. -8dB in the range of 13.3GHz-16GHz.
허광삼,문성익,양두영 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.2
This paper deals with designing the linear power amplifier using MESFET and Schottky diode. The power amplifier is designed to be ensure 3-W linear output using MESFET, and made up of 3-stage class-AB amplifiers in cascade. By choosing the final stage as the balanced structure, the output linearity is enhanced. The balanced structure of amplifier is composed of the Wilkinson power divider and combiner. In the designed 3-stage amplifier, when the input power is lower than -5dBm, power gain is 38dB. And it rapidly decreases as the input power increases larger than -5dBm. Therefore, to compensate for decreasing the gain, pre-distorter circuit is inserted in front of 3-stage amplifier. The pre-distorter is implemented using parallel Schottky diode. The optimized linear power amplifier is composed of these pre-distorter and 3-stage power amplifier. As a result, when the maximum input power is 9dBm, the 1-dB gain compression point of linear power amplifier, P1dB, is 37.61dBm
김윤영,문성익,허광삼,양두영 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1
In this paper, A down converter to convert RF signal into IF signal is designed at the WLL base-station. It consists of low noise amplifier module and down mixer module. The low noise amplifier module is composed of three-stage and a feedback circuit is added in the first-stage low noise amplifier in order to obtain unconditional stability and good flatness. The configuration of the down mixer module is a single-ended type gate mixer. For the good isolation characteristic of each port, a bandpass filter and a lowpass filter are inserted in the input and output port. To design the down converter without the IF power amplifier, it is important to maximize conversion gain. So the down converter of this paper is designed for the purpose of obtaining a high conversion gain. From the results, the IF output power is -12.68dBm when the LO and the RF power level are 7dBm and -80dBm, respectively. Also when the LO power level is 7dBm, P1dB is -0.19dBm, and the RF input power range shows 70dB on wide operating range.
Evaluation of Decellularized Oliver Flounder Skin as Wound Healing Application
Seong-Yeong HEO,Se-Chang KIM,Won-Kyo JUNG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
A cellular matrix derived from natural tissue functions as a highly biocompatible and versatile scaffold for wound healing application. It provides a complex and highly organized environment with biological signals and physical stimuli. Recently, various kinds of tissue/organ decellularized extracellular matrix (dECM) from bovine and porcine have been used as a biomedical application to support tissue regeneration but inherit religious restrictions and risk of disease transmission to humans. Marine fish-derived dECM is seen as attractive alternatives due to their similarity to mammalian physiology, reduced biological risks, and less religious restrictions. The aim of this study was to derive a decellularized matrix from the Olive flounder (Paralichthys olivaceus) skin and evaluate its suitability as a wound healing application. Olive flounder skin was treated with a series of chemical treatments to remove cellular components. Decellularized fish skin (dFS) was characterized and evaluated in vivo to assess its biological activities. The mouse wound defect model was used to evaluate the in vivo performance of the dFS compared with decellularized porcine skin (dPS). The resultant dFS was shown to enhance wound healing compared with the no treatment group and dPS. This study suggests that dFS has potential in skin regenerative application.