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RF performance Analysis for Galileo Receiver Design
Sanghyun Chang,Ilkyoo Lee,Dongpil Chang,Youngwoo Lee,Seunghyeup Oh 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper presents the effects of RF performance parameters on the Galileo receiver design via simulation after reviewing the requirements of the Galileo receiver structure. At first, we considered the general requirements, structure and characteristics of the Galileo system. Then we designed the Galileo receiver focused on performance requirement of 16 ㏈ C/N which is equal to 15 % Error Vector Magnitude (EVM) by using Advanced Design System (ADS) simulation program. In order to verify the function of Automatic Gain Control (AGC)), we measured the IF output power level by changing the input power level at the front - end of the receiver. We analyzed the performance degradation due to phase noise variations of Local Oscillator (LO) in the Galileo receiver through EVM when the minimum sensitivity level of -127 ㏈m is applied at the receiver. We also analyzed the performance degradation according to variable Analog-to-Digital Converter (ADC) bits within the Dynamic range, -92 ~ -139 ㏈m, which has been defined by gain range (-2.5 ~ +42.5 ㏈) in the AGC operation. The results clearly show that the performance of the Galileo receiver can be improved by increasing ADC bits and reducing Phase Noise of LO.
Analysis of Interference with WPT Mobile and Portable Devices That Use NFC
Yanming Cheng,Ilkyoo Lee,Cheng Liu,Jing Niu 대한전자공학회 2019 IEIE Transactions on Smart Processing & Computing Vol.8 No.5
Currently, interest in wireless power transfer (WPT) is increasing for mobile- and portable-device applications. It is necessary to analyze the interference between WPT chargers and other wireless devices for the efficient use of frequency resources. In this paper, the impact of a WPT charger for a cellular phone and a near field communication (NFC) device is analyzed by using the minimum coupling loss (MCL) method and the Monte Carlo (MC) method. As a result, the difference in the maximum allowed transmitting power of a WPT charger is obtained based on different numbers of WPT chargers in order to protect NFC devices without a protection distance between them and the WPT charger. The analysis approach and results are expected to be used as a guideline to investigate the coexistence of low-power devices.
A Study on Compatibility between LTE and WLAN System for Mobile Satellite Wireless Package System
Hojeong Ko,Soonho Jung,Ilkyoo Lee,Juphil Cho,Jae Sang Cha 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
In this paper, we analyzed the adjacent channel interference of the LTE band 40 defined by 3GPP on the WLAN system based on the Monte-Carlo method, and found the guard band required for compatibility between the two systems. This study have a difference compared to the previous studies about cell radius was determined using Extended Hata Model considering practical environment, interference protection distance related to guard band, and the spectrum emission mask improvement effect for minimizing the interference. Simulation results, for no channel interference compatibility of LTE and WLAN for mobile satellite wireless package system, we can find the need 15MHz guard band at specified spectrum emission mask and 10MHz guard band at assumed spectrum emission mask.
A Study on Compatibility between LTE and WLAN System for Mobile Satellite Wireless Package System
Ko, Hojeong,Jung, Soonho,Lee, Ilkyoo,Cho, Juphil,Cha, Jae Sang The Institute of Internet 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
In this paper, we analyzed the adjacent channel interference of the LTE band 40 defined by 3GPP on the WLAN system based on the Monte-Carlo method, and found the guard band required for compatibility between the two systems. This study have a difference compared to the previous studies about cell radius was determined using Extended Hata Model considering practical environment, interference protection distance related to guard band, and the spectrum emission mask improvement effect for minimizing the interference. Simulation results, for no channel interference compatibility of LTE and WLAN for mobile satellite wireless package system, we can find the need 15MHz guard band at specified spectrum emission mask and 10MHz guard band at assumed spectrum emission mask.
Increased extracellular matrix density disrupts E-cadherin/β-catenin complex in gastric cancer cells
Jang, Minjeong,Koh, Ilkyoo,Lee, Jae Eun,Lim, Ju Yeon,Cheong, Jae-Ho,Kim, Pilnam The Royal Society of Chemistry 2018 Biomaterials Science Vol.6 No.10
<P>During gastric cancer (GC) progression, increased extracellular matrix (ECM) deposition, notably collagen type I, correlates with an overall increase in expression of the mesenchymal phenotype. In GC tissue, the intestinal epithelium exhibits impaired cell-cell adhesion and enhanced cell-ECM adhesion. The alteration of intercellular integrity is one of tumorigenesis feature including tumor invasion and metastasis. Using a density-varying ECM, we studied the effect of ECM density on both intercellular- and ECM-interactions according to alterations of ECM-mediated signaling. A dense collagen matrix increases integrin-mediated cell-ECM interactions with phosphorylated FAK and ERK signaling in human gastric adenocarcinoma cells (AGS, MKN74), which regulates GC proliferation and the chemotherapeutic response. In addition, GC cells exhibited a disrupted membranous E-cadherin/β-catenin complex and, remarkably, showed cytoplasmic or nucleic localization of β-catenin in response to collagen density. Furthermore, we found that membranous E-cadherin/β-catenin complex could be recovered by inhibiting the phosphorylation of FAK, which in turn influences the chemotherapeutic effect. These results provide insight into how matrix density differentially regulates cancer cell phenotype and may have significant implications for the design of biomaterials with appropriate physical properties for <I>in vitro</I> tumor models.</P>