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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.
Risk Factors for Cervical Cancer in Rural Areas of Wuhan China: a Matched Case-control Study
Zhang, Bin,Zhou, Ai-Fen,Zhu, Chang-Cai,Zhang, Ling,Xiang, Bing,Chen, Zhong,Hu, Rong-Hua,Zhang, Ya-Qi,Qiu, Lin,Zhang, Yi-Ming,Xiong, Chao-Du,Du, Yu-Kai,Shi, Yu-Qin Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
Cervical cancer is a serious public health problem in developing countries. We investigated possible risk factors for cervical cancer in rural areas of Wuhan China using a matched case-control study with 33 women diagnosed with cervical cancer and 132 healthy women selected from the same area as matched controls. A questionnaire, which included questions about general demography conditions, environmental and genetic factors, the first sexual intercourse, first marriage age, age at first pregnancy, pregnancy first child's age, female personal health history, social psychological factors, dietary habits, smoking and alcohol status and other living habits was presented to all participants. At the same time, HPV infection of every participant was examined in laboratory testing. Results showed HPV infection (P<0.000, OR=23.4) and pregnancy first child's age (P<0.000, OR=13.1) to be risk factors for cervical cancer. Menopause (P=0.003, OR=0.073) was a protective factor against cervical cancer. However, there was no indication of associations of environmental (drinking water, insecticide, disinfectant) genetic (cancer family history), or life-style factors (smoking status, alcohol status, physical training, sleep quality), including dietary habits (intake of fruit and vegetable, meat, fried food, bean products and pickled food) or social psychological factors with cervical cancer. The results suggest that the risk of cervical cancer in Chinese rural women may be associated with HPV infection, menopause and the pregnancy first child's age.
Streptomyces lushanensis sp. nov., a novel actinomycete with anti-cyanobacterial activity
Zhang, Bing-Huo,Cheng, Juan,Chen, Wei,Li, Han-Quan,Yang, Jian-Yuan,Park, Dong-Jin,Kim, Chang-Jin,Shen, Rui,Duan, Yan-Qin,Li, Wen-Jun Nature Publishing Group 2015 The Journal of Antibiotics Vol. No.
<P>Strain JXJ 0135(T), an anti-cyanobacterial actinomycete, was isolated from a soil sample collected from Lushan Mountain, south China, and identified by using polyphasic approach. Phylogenetic analysis of the near-complete 16S rRNA gene sequence indicated that strain JXJ 0135(T) belongs to the genus Streptomyces and exhibited distinct subclade and also highest similarity (98.6%) to Streptomyces scopuliridis RB72(T). The strain developed well-branched substrate and aerial mycelia, and produced spiral spore chains. Spores were elliptical and the spore surface was smooth. The strain contained LL-diaminopimelic acid with whole-cell sugars of mannose, rhamnose, glucose and galactose. Phospholipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol mannosides, phosphotidylinositol dimannoside, an unidentified aminophospholipid and an unknown phospholipid. The menaquinones were MK-9(H6) and MK-9(H8). The major components of the fatty acids were anteiso-C15:0, iso-C16:0, anteiso-C17:0, iso-C15:0, C16:0, iso-C17:0 and iso-C14:0. The G+C content was 69.3?mol%. The DNA-DNA hybridization value between JXJ 0135(T) and S. scopuliridis RB72(T) was 41.21.4%. On the basis of the polyphasic data, strain JXJ 0135(T) represents a novel species of the genus Streptomyces, for which the name Streptomyces lushanensis sp. nov. is proposed. The type strain is JXJ 0135(T) (=DSM 42121(T)=JCM 19628(T)=KCTC 29261(T)=KACC 17834(T)=NRRL B-24994(T)).</P>
Hyperspectral Remote Sensing Technology and Application in China
Zhang, Bing,Tong, Qingxi,Zheng, Lanfen 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
In recent years, hyperspectral remote sensing has stepped into a new stage in China. There are several advanced hyperspectral imaging systems developed in Chinese. Especially the Chinese Academy of Sciences(CAS) has been playing a very important role in such High-technology developing activities. Pushbroom Hyperspectral Imager (PHI) and Operative Modular Imaging Spectrometer (OMIS) are two types of representative hyperspectral imagers developed by CAS. A hyperspectral digital camera system (HDCS), with limit-number bands but high spectral resolution, was also developed and tested in 2000. Aiming to different observation objects and applications, the spectral wavelength and resolution of HDCS can be easily changed by selecting different interference fiilters. According to these airborne hyperspectral sensors, some data processing and info-extraction models are also developed in China. These models have been widely used in many remote sensing projects, such as precise agriculture, mineral exploration, urban investigation, and so on. In addition, a Hyperspectral Image Processing and Analysis System (HIPAS) software were also developed.
Implementation of 3D Human Simulation to the Design of the Design of μ-Assembly Machine
Bing Lin Zhang(장병림),Guan Wang(왕관),Dug Hee Moon(문덕희),Jun-Yeob Song(송준엽),Chang Woo Lee(이창우) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
This paper describes a case study of applying 3D human simulation to the design of a u-assembly machine which is a micro semi-automatic machine. Two types of assembly machine are tested and compared. The purpose of our research is to find out a better design considering ergonomics through the implementation of 3D human simulation and RULA analysis. The worker's working postures are analyzed during the simulation of assembly process.
Model Predictive Power Control of a PWM Rectifier for Electromagnetic Transmitters
Zhang, Jialin,Zhang, Yiming,Guo, Bing,Gao, Junxia The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3
Model predictive direct power control (MPDPC) is a widely recognized high-performance control strategy for a three-phase grid-connected pulse width modulation (PWM) rectifier. Unlike those of conventional grid-connected PWM rectifiers, the active and reactive powers of permanent magnet synchronous generator (PMSG)-connected PWM rectifiers, which are used in electromagnetic transmitters, cannot be calculated as the product of voltage and current because the back electromotive force (EMF) of the generator cannot be measured directly. In this study, the predictive power model of the rectifier is obtained by analyzing the relationship among flux, back EMF, active/reactive power, converter voltage, and stator current of the generator. The concept of duty cycle control in the proposed MPDPC is introduced by allocating a fraction of the control period for a nonzero vector and rest time for a zero vector. When nonzero vectors and their duration in the predefined cost function are simultaneously evaluated, the global power ripple minimization is obtained. Simulation and experimental results prove that the proposed MPDPC strategy with duty cycle control for the PMSG-connected PWM rectifier can achieve better control performance than the conventional MPDPC-SVM with grid-connected PWM rectifier.
Implementation of 3D Human Simulation to the Design of the Design of μ-Assembly Machine
Bing Lin Zhang(장병림),Guan Wang(왕관),Dug Hee Moon(문덕희),Jun-Yeob Song(송준엽),Chang Woo Lee(이창우) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
This paper describes a case study of applying 3D human simulation to the design of a u-assembly machine which is a micro semi-automatic machine. Two types of assembly machine are tested and compared. The purpose of our research is to find out a better design considering ergonomics through the implementation of 3D human simulation and RULA analysis. The worker's working postures are analyzed during the simulation of assembly process.