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A Co-design Study of Filters and Oscillator for Low Phase Noise and High Harmonic Rejection
Bing Zhang,Wenmei Zhang,Runbo Ma,Xiaowei Zhang,Junfa Mao 한국전자통신연구원 2008 ETRI Journal Vol.30 No.2
In this paper, we present a novel oscillator (OSC) design. Bandpass filters, which can suppress harmonics, are incorporated into a co-design with an OSC to improve the OSC phase noise and harmonic rejection. The proposed OSC/bandpass filter co-design achieves a phase noise of - 130.1 dBc/Hz/600 kHz and harmonic rejection of 37.94 dB and 40.85 dB for the second and third harmonics, respectively, as compared to results achieved by the OSC before co-design of - 101.6 dBc/Hz/600 kHz and 21.28 dB and 19.68 dB. Good agreement between the measured and simulated results is achieved.
Multi-harmonic Suppression Band-Pass Filter for Communication System
Wenmei Zhang,Liping Han,Runbo Ma,Junfa Mao 한국전자통신연구원 2007 ETRI Journal Vol.29 No.4
For the purpose of decreasing intermodulation distortion, a new multi-harmonic suppression band-pass filter based on a microstrip radial stub is studied. Compared with traditional resonator filters, the new filter can suppress the second, third, and even fourth harmonics directly. The dimension of the filter is about 0.3 λg0×0.13 λg0 (λg0 is the guiding wavelength at the resonant frequency). Only one gap was introduced, so lower insertion loss can be obtained. Basic agreement between the measured and simulated results has been achieved.
Design of Balanced Dual-Band Bandpass Filter with Self-Feedback Structure
Xinwei Chen,Guorui Han,Runbo Ma,Jiangrui Gao,Wenmei Zhang 한국전자통신연구원 2009 ETRI Journal Vol.31 No.4
A balanced dual-band bandpass filter based on λ/2 stepped-impedance resonators and open-loop resonators is proposed in this letter. By employing a type of self-feedback structure, an extra transmission zero is introduced near the common-mode resonance frequency, and the common-mode signal is suppressed. The measured results indicate that the filter can operate in 2.46 GHz and 5.6 GHz bands, and the insertion loss is 1.85 dB and 1.9 dB, respectively. Also, better common-mode suppression is achieved.
Novel blood-based hypomethylation of SH3BP5 is associated with very early-stage lung adenocarcinoma
Qiao Rong,Zhong Runbo,Liu Chunlan,Di Feifei,Zhang Zheng,Wang Ling,Xu Tian,Wang Yue,Dai Liping,Gu Wanjian,Han Baohui,Yang Rongxi 한국유전학회 2022 Genes & Genomics Vol.44 No.4
Background: Early detection is essential to improve the survival of lung cancer (LC). The quantitative measurement of specific DNA methylation changes in the peripheral blood could provide an efficient strategy for the detection of early cancer. Objective: We applied a candidate approach and assess the association between blood-based SH3BP5 methylation and the risk of lung adenocarcinoma (LUAD) in a case-control cohort. Methods: The methylation level of four CpG sites in the promoter of SH3BP5 gene was quantitatively determined by mass spectrometry in 171 very early-stage LUAD patients (93.6% LUAD at stage I) and 190 age and gender-matched controls. The logistic regression and non-parametric tests were used for the statistical analyses. Results: We observed a significant association between decreased methylation of SH3BP5_CpG_4 in the peripheral blood and increased risk of LUAD (odds ratio (OR) per-10% methylation = 1.51, P = 0.006, FDR = 0.024), and even for the LUAD at stage I (OR per-10% methylation = 1.53, P = 0.006, FDR = 0.024). Moreover, the lower quartile of SH3BP5_CpG_4 methylation was correlated with increased risk for LUAD with a P trend of 0.011. Further investigation disclosed that the hypomethylation of SH3BP5_CpG_4 was mostly associated with LUAD in younger subjects (OR per-10% methylation = 2.02, P = 0.010, age < 55 years old) and probably could be enhanced by advance stage. Conclusion: Our study revealed an association between blood-based SH3BP5 hypomethylation and very early-stage LUAD, which provides a novel support for the blood-based methylation signatures as a potential marker for the evaluation of cancer risk.
Differential Dual-Frequency Antenna for Wireless Communication
Liping Han,Wenmei Zhang,Guorui Han,Runbo Ma,Li Li 한국전자통신연구원 2008 ETRI Journal Vol.30 No.6
A novel differential dual-frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz.
Tianyan Liu,Xiangyang Xu,Minghui Zhang,Runbo Zhang,Yue Wu,Hongzhi Ji,Yanfang Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
Under the engaging process, excessive temperature of clutch plates may lead to thermal failure. Existing research has failed to find the hot spot and the radial temperature difference real-timely. They also neglected the influence of dynamic sliding process and hydraulic characteristics. Thus, a multi-domain dynamic model of the whole clutch was proposed, involving the mechanical dynamics, the hydraulic dynamics and thermics. With the thermal resistance network method, the real-time axial and radial temperature prediction of clutch plates was realized. The highest temperature occurs on the friction pairs of axial middle and the maximum value occurs on the radial 5th mass. Compared with the results by FEM, the deviation is about 6.5 %, but the time duration is reduced significantly. Furthermore, the influence of the outer hub vibration (160 Hz, 0.2 Hz) on the dynamic characteristics was discussed. This work was tested to be an effective and good basis for the health prediction of wet clutches.