Search results for: Guobin Chang

Items from 1 to 20 out of 58 results

article

Iron‐Confined CRISPR/Cas9‐Ribonucleoprotein Delivery System for Redox‐Responsive Gene Editing

Lingling Qiu, Minmin Sun, Lei Chen, Jing Jiang, more

Small > 20 > 30 > n/a - n/a

Clustered regularly interspaced short palindromic repeat (CRISPR)‐associated protein 9 (Cas9) is a promising gene editing tool to treat diseases at the genetic level. Nonetheless, the challenge of the safe and efficient delivery of CRISPR/Cas9 to host cells constrains its clinical applicability. In the current study, a facile, redox‐responsive CRISPR/Cas9‐Ribonucleoprotein (RNP) delivery system by...

article

Prediction of the potential distribution pattern of the great gerbil (Rhombomys opimus) under climate change based on ensemble modelling

Xuanye Wen, Guanghua Zhao, Xiaotian Cheng, Guobin Chang, more

Pest Management Science > 78 > 7 > 3128 - 3134

BACKGROUND Rodent infestation is a global biological problem. Rodents are widely distributed worldwide, cause harm to agriculture, forestry, and animal husbandry production and spread a variety of natural focal diseases. In this study, 10 ecological niche models were combined into an ensemble model to assess the distribution of suitable habitats for Rhombomys opimus and to predict the impact of future...

article

Narrow H3K4me2 is required for chicken PGC formation

Chen Zhang, Qisheng Zuo, Man Wang, Hao Chen, more

Journal of Cellular Physiology > 236 > 2 > 1391 - 1400

The development of primordial germ cells (PGCs) undergoes epigenetic modifications. The study of histone methylation in regulating PGCs is beneficial to understand the development and differentiation mechanism of germ stem cells. Notably, it provides a theoretical basis for directed induction and mass acquisition in vitro. However, little is known about the regulation of PGC formation by histone methylation...

article

Selecting data for autoregressive modeling in polar motion prediction

Fei Wu, Guobin Chang, Kazhong Deng, Wuyong Tao

Acta Geodaetica et Geophysica > 2019 > 54 > 4 > 557-566

The Least-squares extrapolation of harmonic models and autoregressive (LS + AR) prediction is currently considered to be one of the best prediction model for polar motion parameters. In this method, LS fitting residuals are treated as data to train an AR model. But it is readily known that using too many data will result in learning a badly relevant AR model, implying increasing the model bias. It...

article

New range domain carrier‐smoothed code filtering with dual‐frequency BDS data

Chao Chen, Guobin Chang, Shubi Zhang, Guoliang Chen, more

Asian Journal of Control > 21 > 4 > 1496 - 1505

In global navigation satellite system (GNSS) applications, the carrier‐smoothed code is a widely used technique to combine code pseudo‐range and carrier phase measurements. Unlike conventional methods, a method using dual‐frequency GNSS data to improve smoothing accuracy by eliminating ionosphere delay is described in this paper. In the recursive least‐squares theory for colored measurement errors...

article

Helmert transformation solutions combination and update with new measurements

Shengquan Li, Bing Ji, Guobin Chang, Peng Lin, more

Acta Geodaetica et Geophysica > 2019 > 54 > 2 > 181-196

This work is concerned with refining the Helmert solutions in two different cases, namely combining different solutions and updating old solutions with newly available measurement data. The parameters to be estimated in the solutions here not only include the transformation parameters, namely the rotation, the translation and the scale, but also the coordinates in the final frame of all relevant stations...

article

An adaptive Kalman filter based on variance component estimation for a real-time ZTD solution

Xu Yang, Guobin Chang, Qianxin Wang, Shubi Zhang, more

Acta Geodaetica et Geophysica > 2019 > 54 > 1 > 89-121

The Global Navigation Satellite System (GNSS) precise point positioning (PPP) technology is currently used to process GNSS water vapor observations in real time or near real time. Further developments are required to improve the accuracy and real-time performance of processing tropospheric delays from which the water vapor observations are extracted. In real-time BDS/GPS precise clock correction estimation...

article

Roles of miRNA‐1 and miRNA‐133 in the proliferation and differentiation of myoblasts in duck skeletal muscle

Ningzhao Wu, Tiantian Gu, Lu Lu, Zhengfeng Cao, more

Journal of Cellular Physiology > 234 > 4 > 3490 - 3499

MicroRNA (miRNA)‐1 and miRNA‐133 are derived from the same bicistronic pairs with roles in skeletal muscle development. Many investigations have focused on the role of miRNA‐1 and miRNA‐133 in the regulation of skeletal muscle development in mammals and fish. However, the mechanisms of miRNA‐1 and miRNA‐133 underlying the differences in skeletal muscle development between different breeds are not...

article

Iterative solution of Helmert transformation based on a unit dual quaternion

Huaien Zeng, Guobin Chang, Haiqing He, Yi Tu, more

Acta Geodaetica et Geophysica > 2019 > 54 > 1 > 123-141

The rigid motion involving both rotation and translation in the 3D space can be simultaneously described by a unit dual quaternion. Considering this excellent property, the paper constructs the Helmert transformation (seven-parameter similarity transformation) model based on a unit dual quaternion and then presents a rigid iterative algorithm of Helmert transformation using a unit dual quaternion...

article

piRNA‐19128 regulates spermatogenesis by silencing of KIT in chicken

Qixin Guo, Lu Xu, Yulin Bi, Lingling Qiu, more

Journal of Cellular Biochemistry > 119 > 10 > 7998 - 8010

Spermatogenesis is a complex process. Some studies have shown that Piwi‐interacting RNAs (piRNAs) play an important role in spermatogenesis. To verify the evaluate between piRNAs and PIWI proteins in chicken and its possible role in spermatogenesis and reproductive stem cell proliferation and differentiation, we performed immunoprecipitation and deep sequencing analyses and determined the expression...

article

The application of a combination of weighted least-squares and autoregressive methods in predictions of polar motion parameters

Fei Wu, Kazhong Deng, Guobin Chang, Qianxin Wang

Acta Geodaetica et Geophysica > 2018 > 53 > 2 > 247-257

This study employs a combination of weighted least-squares extrapolation and an autoregressive model to produce medium-term predictions of polar motion (PM) parameters. The precisions of PM parameters extracted from earth orientation parameter (EOP) products are applied to determine the weight matrix. This study employs the EOP products released by the analysis center of the ‘International Global...

article

A dual quaternion algorithm of the Helmert transformation problem

Huaien Zeng, Xing Fang, Guobin Chang, Ronghua Yang

Earth, Planets and Space > 2018 > 70 > 1 > 1-12

Rigid transformation including rotation and translation can be elegantly represented by a unit dual quaternion. Thus, a non-differential model of the Helmert transformation (3D seven-parameter similarity transformation) is established based on unit dual quaternion. This paper presents a rigid iterative algorithm of the Helmert transformation using dual quaternion. One small rotation angle Helmert...

article

Adaptive Kalman filter based on variance component estimation for the prediction of ionospheric delay in aiding the cycle slip repair of GNSS triple-frequency signals

Guobin Chang, Tianhe Xu, Yifei Yao, Qianxin Wang

Journal of Geodesy > 2018 > 92 > 11 > 1241-1253

In order to incorporate the time smoothness of ionospheric delay to aid the cycle slip detection, an adaptive Kalman filter is developed based on variance component estimation. The correlations between measurements at neighboring epochs are fully considered in developing a filtering algorithm for colored measurement noise. Within this filtering framework, epoch-differenced ionospheric delays are predicted...

article

Impacts of Earth rotation parameters on GNSS ultra-rapid orbit prediction: Derivation and real-time correction

Qianxin Wang, Chao Hu, Tianhe Xu, Guobin Chang, more

Advances in Space Research > 2017 > 60 > 12 > 2855-2870

Analysis centers (ACs) for global navigation satellite systems (GNSSs) cannot accurately obtain real-time Earth rotation parameters (ERPs). Thus, the prediction of ultra-rapid orbits in the international terrestrial reference system (ITRS) has to utilize the predicted ERPs issued by the International Earth Rotation and Reference Systems Service (IERS) or the International GNSS Service (IGS). In this...

article

Identification of key genes fluctuated induced by avian leukemia virus (ALV-J) infection in chicken cells

Guohong Chen, Zhiteng Li, Shuai Su, Guobin Chang, more

In Vitro Cellular & Developmental Biology - Animal > 2018 > 54 > 1 > 41-51

Avian leukemia subgroup J (ALV-J) is one of the most detrimental neoplastic diseases in poultry production. However, the differences between somatic cells and immune cells post-infection remain poorly understood. The aim of our study was to detect the different responses in chicken to infection with ALV-J in different cell lines. In this study, we detected transcriptome expression changes during infection...

article

Discovery of novel long non-coding RNAs induced by subgroup J avian leukosis virus infection in chicken

Lingling Qiu, Zhiteng Li, Guobin Chang, Yulin Bi, more

Developmental & Comparative Immunology > 2017 > 76 > C > 292-302

Avian leukosis virus subgroup J (ALV-J) is an avian oncogenic retrovirus that has led to severe economic losses in the poultry industry in China in recent decades. Here, using high throughput transcriptome sequencing of HD11 and CEF cells infected with ALV-J, a set of 4804 novel long non-coding transcripts and numerous differentially expressed long non-coding RNAs (lncRNAs) were identified. We also...

article

Analytical solution to and error analysis of the quaternion based similarity transformation considering measurement errors in both frames

Guobin Chang, Tianhe Xu, Qianxin Wang, Ming Liu

Measurement > 2017 > 110 > C > 1-10

The similarity transformation between two coordinate frames, is widely adopted in science and engineering. The transformation parameters are estimated using coordinate determinations of a set of common points in both frames. The quaternion is employed to represent the rotation transformation; and a 3×1 error vector is defined to represent the quaternion estimation error. Coordinate determinations...

article

Generalized total Kalman filter algorithm of nonlinear dynamic errors-in-variables model with application on indoor mobile robot positioning

Hang Yu, Jian Wang, Bin Wang, Houzeng Han, more

Acta Geodaetica et Geophysica > 2018 > 53 > 1 > 107-123

In this paper, a nonlinear dynamic errors-in-variables (DEIV) model which considers all of the random errors in both system equations and observation equations is presented. The nonlinear DEIV model is more general in the structure, which is an extension of the existing DEIV model. A generalized total Kalman filter (GTKF) algorithm that is capable of handling all of random errors in the respective...

article

GNSS attitude determination method through vectorisation approach

Guobin Chang, Tianhe Xu, Qianxin Wang, Shengquan Li, more

IET Radar, Sonar & Navigation > 2017 > 11 > 10 > 1477 - 1482

Determining the attitude using GNSS carrier signals is studied. It features an analytical approach to get an estimate as initial guess for iterative algorithms, in three steps. First, baseline vectors are estimated by least-squares method. Second, the constraint of the direction cosine matrix (DCM) is ignored and the least-squares estimates of its 9 elements are solved. Third, a mathematically feasible...

article

M-estimator for the 3D symmetric Helmert coordinate transformation

Guobin Chang, Tianhe Xu, Qianxin Wang

Journal of Geodesy > 2018 > 92 > 1 > 47-58

The M-estimator for the 3D symmetric Helmert coordinate transformation problem is developed. Small-angle rotation assumption is abandoned. The direction cosine matrix or the quaternion is used to represent the rotation. The $$3 \times 1$$ 3 × 1 multiplicative error vector is defined to represent the rotation estimation error. An analytical solution can be employed to provide the initial...

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INFONA - science communication portal

Search results for: Guobin Chang

Iron‐Confined CRISPR/Cas9‐Ribonucleoprotein Delivery System for Redox‐Responsive Gene Editing

Prediction of the potential distribution pattern of the great gerbil (Rhombomys opimus) under climate change based on ensemble modelling

Narrow H3K4me2 is required for chicken PGC formation

Selecting data for autoregressive modeling in polar motion prediction

New range domain carrier‐smoothed code filtering with dual‐frequency BDS data

Helmert transformation solutions combination and update with new measurements

An adaptive Kalman filter based on variance component estimation for a real-time ZTD solution

Roles of miRNA‐1 and miRNA‐133 in the proliferation and differentiation of myoblasts in duck skeletal muscle

Iterative solution of Helmert transformation based on a unit dual quaternion

piRNA‐19128 regulates spermatogenesis by silencing of KIT in chicken

The application of a combination of weighted least-squares and autoregressive methods in predictions of polar motion parameters

A dual quaternion algorithm of the Helmert transformation problem

Adaptive Kalman filter based on variance component estimation for the prediction of ionospheric delay in aiding the cycle slip repair of GNSS triple-frequency signals

Impacts of Earth rotation parameters on GNSS ultra-rapid orbit prediction: Derivation and real-time correction

Identification of key genes fluctuated induced by avian leukemia virus (ALV-J) infection in chicken cells

Discovery of novel long non-coding RNAs induced by subgroup J avian leukosis virus infection in chicken

Analytical solution to and error analysis of the quaternion based similarity transformation considering measurement errors in both frames

Generalized total Kalman filter algorithm of nonlinear dynamic errors-in-variables model with application on indoor mobile robot positioning

GNSS attitude determination method through vectorisation approach

M-estimator for the 3D symmetric Helmert coordinate transformation

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