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| 1 | Investigation on the development of deep space exploration显示文摘Deep space exploration is the term used for the exploration of the Moon and the celestial bodies or space beyond the Moon, which is an important part of human space activities. Firstly, the development of deep space exploration (not including the Moon) during the last few decades is summarized. Secondly, the development trend of different space countries and regions is analyzed. Then the experience and enlightenment of deep space exploration are briefly discussed. Some suggestions for China's future deep space exploration are given in the end. | WU WeiRen LIU WangWang QIAO Dong JIE DeGang | 2012 | Science China(Technological Sciences)2012，55，4： | 14 |
| 2 | Pre-LOI trajectory maneuvers of the CHANG'E-2 libration point mission显示文摘This paper addresses pre-LOI (before Lissajous orbit insertion) trajectory maneuvers for the libration point mission of CHANG'E-2,which is the first Chinese satellite to fly to the Sun-Earth L2 libration point and the first satellite ever to fly to the L2 point from lunar orbit.First,a transfer trajectory for the mission is designed based on InterPlanetary Superhighway theory under the constraint of the remaining propellant,TT&C (telemetry,track and command) and sunlight conditions.The effects of trajectory maneuver errors on the mission are also analyzed.Second,based on the analysis results,the article investigates the trajectory maneuver schemes for the lunar escape and transfer trajectory maneuvers employing mathematical models and operational strategies.The mission status based on our maneuver schemes is then presented,and the results of control operation and corresponding analysis are provided in detail.Finally,the future trajectory maneuver in the Lissajous orbit is discussed.According to the analysis of the CHANG'E-2 TT&C data,the trajectory maneuver schemes proposed in the article work properly and efficiently. | WU WeiRen LIU Yong LIU Lei ZHOU JianLiang TANG GeShi CHEN YongZhi | 2012 | Science China(Information Sciences)2012，55，6： | 12 |
| 3 | Methods for mapping QTLs underlying endosperm traits based on random hybridization design显示文摘Several methods of interval mapping of QTLs underlying endosperm traits based on random hybridization designs and the triploid genetic model are proposed. The basic idea is: plants (or lines) from a population with known marker genotype information are randomly hybridized to generate a population of hybrid lines for endosperm QTL mapping; a mixture of seeds of each hybrid line is measured for the en- dosperm trait to get the mean of the line; then en- dosperm QTL mapping and effect estimation is per- formed using the endosperm trait means of hybrid lines and the marker genotype information of parental plants (or lines). The feasibility and efficiency of the methods are examined by computer simulations. Results show that the methods can precisely map endosperm QTLs and unbiasedly and efficiently es- timate the three effects (additive effect, first dominant effect, second dominant effect) of endosperm QTLs. | WEN Yongxian WU Weiren | 2006 | Chinese Science Bulletin2006，51，16： | 7 |
| 4 | Genetic analysis and fine mapping of an enclosed panicle mutant esp2 in rice (Oryza sativa L.)显示文摘The phenomenon of panicle enclosure in rice is mainly caused by the shortening of uppermost internode.Elucidating the molecular mechanism of panicle enclosure will be helpful for solving the problem of panicle enclosure in male sterile lines and creating new germplasms in rice.We acquired a monogenic recessive enclosed panicle mutant,named as esp2 (enclosed shorter panicle 2),from the tissue culture progeny of indica rice cultivar Minghui-86.In the mutant,panicles were entirely enclosed by flag leaf sheaths and the uppermost internode was almost completely degenerated,but the other internodes did not have obvious changes in length.Genetic analysis indicated that the mutant phenotype was controlled by a recessive gene,which could be steadily inherited and was not affected by genetic background.Apparently,ESP2 is a key gene for the development of uppermost internode in rice.Using an F 2 population of a cross between esp2 and a japonica rice cultivar Xiushui-13 as well as SSR and InDel markers,we fine mapped ESP2 to a 14-kb region on the end of the short arm of chromosome 1.According to the rice genome sequence annotation,only one intact gene exists in this region,namely,a putative phosphatidylserine synthase gene.Sequencing analysis on the mutant and the wild type indicated that this gene was inserted by a 5287-bp retrotransposon sequence.Hence,we took this gene as a candidate of ESP2.The results of this study will facilitate the cloning and functional analysis of ESP2 gene. | GUAN HuaZhong DUAN YuanLin LIU HuaQing CHEN ZhiWei ZHUO Ming ZHUANG LiJun QI WenMing PAN RunSen MAO DaMei ZHOU YuanChang WANG Feng WU WeiRen | 2011 | Chinese Science Bulletin2011，56，14： | 6 |
| 5 | Overview of deep space laser communication显示文摘The deep space probe is a vital technology for observing and exploring the universe. It is thus intensifying as an aerospace research focus on an international scale. Despite improving the frequency band,the conventional microwave communication technique has difficulty satisfying the increased demand for the enormous volume of scientific data returning to the Earth. With a carrier frequency that is several orders of magnitude higher than the microwave, free-space optical communication is a robust and promising method for achieving both high bit rates and long distances in deep space communication. In this article, the history of this technology is summarized and the objective laws are formulated, while key techniques and development trends are analyzed. Finally, useful concepts and suggestions are proposed for the development of deep space laser communication in China. | Weiren WU Ming CHEN Zhe ZHANG Xiangnan LIU Yuhui DONG | 2018 | Science China(Information Sciences)2018，61，4： | 6 |
| 6 | Strategy for the mapping of interactive genes using bulked segregant analysis method and Mapmaker/Exp software显示文摘A qualitative trait is usually controlled by a single gene, but it may be sometimes controlled by two or even more genes. This phenomenon is called gene interaction. Rapidly searching for linked mo- lecular markers via bulked segregant analysis (BSA) and then constructing regional linkage map with Mapmaker/Exp has become a common approach to mapping single major genes. However, methods and computer programs developed for mapping single major genes cannot be simply applied to interactive genes because the genetic patterns of gene interac- tions are quite different from that of single-gene in- heritance. Up to now, experimental methods for quickly screening molecular markers linked to inter- active genes and statistical methods and corre- sponding computer softwares for simultaneously analyzing the linkage relationships of multiple mo- lecular markers to an interactive gene have not been available. To solve this problem, in this paper, we propose a strategy for mapping interactive genes using BSA and Mapmaker/Exp. We demonstrate that all interactive genes can be mapped by the 'BSA + Mapmaker/Exp' strategy using F2 generation (in a few cases, F3 generation is also needed). As BSA and Mapmaker/Exp have been broadly used in gene mapping studies and are well known by many re- searchers, the strategies proposed in this paper will be useful for practical researches. | WU Weiren HUANG Biguang | 2006 | Chinese Science Bulletin2006，51，21： | 5 |
| 7 | Detection of quantitative trait loci and heterotic loci for plant height using an immortalized F_2 population in maize显示文摘A set of recombinant inbred lines (RIL) derived from Yuyu22, an elite hybrid widespread in China, was used to construct an immortalized F2 (IF2) population comprising 441 different crosses. Genetic linkage maps were constructed containing 10 linkages groups with 263 simple sequence repeat (SSR) molecular markers. Twelve and ten quantitative trait loci (QTL) were detected for plant height in the IF2 and RIL populations respectively, using the composite interval mapping method, and six same QTL were identified in the two populations. In addition, ten unique heterotic loci (HL) located on seven different chromosomes were revealed for plant height using the mid-parent heterosis as the input data. These HL explained 1.26%―8.41% of the genotypic variance in plant height heterosis and most expressed overdominant effects. Only three QTL and HL were located in the same chromosomal region, it implied that plant height and its heterosis might be controlled by two types of genetic mechanisms. | TANG JiHua MA XiQing TENG WenTao YAN JianBing WU WeiRen DAI JingRui LI JianSheng | 2007 | Chinese Science Bulletin2007，52，4： | 5 |
| 8 | Fine mapping of cisc(t),a gene for cold-induced seedling chlorosis,and identification of its candidate in rice显示文摘The seedlings of indica rice cultivar Dular are susceptible to chlorosis under low temperature conditions.Our previous studies indicated that low temperature-induced seedling chlorosis is controlled by a recessive gene,located between SSR markers RM257 and RM242,on the long arm of chromosome 9.We temporarily named the gene cisc(t).Using a large F2 population derived from a cross between Dular and the japonica cultivar Lemont,which displays a normal green color at low temperatures,cisc(t)was fine mapped to within a 12-kb interval.There is only one annotated gene in this interval,which encodes a pentatricopeptide repeat(PPR)protein.Sequence analysis indicated that 8 bases were deleted at the 60th base in the Dular allele,resulting in a frame-shift mutation and loss of function of the gene.This is consistent with the chlorosis mutant phenotype of Dular.In addition,previous studies have shown that many chlorosis mutants of seedlings are related to PPR proteins.Hence,we presume that the PPR gene is the candidate for cisc(t). | LAN Tao WANG Bin LING QiuPing XU ChunHua TONG ZhiJun LIANG KangJing DUAN YuanLin JIN Jing WU WeiRen | 2010 | Chinese Science Bulletin2010，55，27： | 5 |
| 9 | Development of DArT markers for a linkage map of flue-cured tobacco显示文摘Tobacco(Nicotiana tabacum) is one of the most economically important nonfood crops,and flue-cured tobacco accounts for approximately 80% of world tobacco production.An extremely narrow genetic diversity in the tobacco pool has led to a low efficiency of PCR-based molecular markers(such as AFLP and SSR).Diversity Arrays Technology(DArT) is a high-throughput hybridisation-based marker system that has been developed in many plants including wheat,which,like tobacco,has a complex genome.In this study,we developed a tobacco DArT chip that included 7680 representative sequence tags based on typical tobacco accessions.The 1076 DArT markers of flue-cured tobacco were identified and most(82.1%) of their polymorphism information contents(PICs) were greater than 0.4.An integrated linkage map that included 851 markers(238 DArT and 613 SSR),which is the highest density map of flue-cured tobacco to date,was constructed.This chip-based DArT system provides an alternative in high-throughput marker genotyping for tobacco. | LU XiuPing GUI YiJie XIAO BingGuang LI YongPing TONG ZhiJun LIU Yun BAI XueFei WU WeiRen XIA Ling HUTTNER Eric KILIAN Adrzej FAN LongJiang | 2013 | Chinese Science Bulletin2013，58，6： | 4 |
| 10 | Design of communication relay mission for supporting lunar-farside soft landing显示文摘Chang'E-IV will be the first soft-landing and rover mission on the lunar farside. The relay satellite, which is located near the Earth-Moon L2 point for relay communication, is the key to the landing mission. Based on an analysis of the characteristics of the task and the technical difficulties associated with the relay satellite system, the overall design scheme of the relay communication mission is proposed in terms of trajectory design and communication system design among other aspects. First, according to the complex dynamic environment, a mission orbit that serves as an uninterrupted communication link is presented. A short-duration and low-energy transfer trajectory with lunar flyby is discussed. Orbital correction and a low-cost control strategy for orbit maintenance in the Earth-Moon L2 point region are provided. Second,considering the existing technical constraints, the requirement of relay communication in different stages and the design schemes of frequency division and redundant relay communication system are introduced. Finally,based on the trajectory design index and the performance of the communication system, the overall design scheme of the relay communication mission is proposed. This mission will provide the technical support and reference required for the Chang'E-IV mission. | Weiren WU Yuhua TANG Lihua ZHANG Dong QIAO | 2018 | Science China(Information Sciences)2018，61，4： | 4 |
| 11 | Technological breakthroughs and scientific progress of the Chang’e-4 mission显示文摘Chang’e-4 is the first man-made probe that accomplished landing and roving on the far side of the Moon,which is viewed as a new milestone in the history of Lunar exploration.Beginning with a brief introduction to the progress of domestic and foreign Lunar exploration,this paper reviews the implementation process of the Chang’e-4 project,sorts out the technical breakthroughs achieved,summarizes the exploration achievements,and provides references for subsequent Lunar exploration. | Weiren WU Dengyun YU Chi WANG Jizhong LIU Yuhua TANG He ZHANG Zhe ZHANG | 2020 | Science China(Information Sciences)2020，63，10： | 3 |
| 12 | Spacecraft angular velocity estimation method using optical flow of stars显示文摘Angular velocity is a crucial parameter for spacecraft navigation, which, at present, is mainly obtained by using gyroscopes. Several studies have been performed on angular velocity estimation using star sensors when data from gyroscopes are not available. Most of the previous angular velocity estimation methods using star sensors are based on information on the attitude or star vector measurements. In this paper,an angular velocity estimation method using the optical flow(OF) directly from the star images is proposed,which, unlike the previous methods, requires star coordinates in two consecutive images only. Because the procedure of star identification is eliminated, the corresponding high computation requirement is reduced.Simulations demonstrate that the proposed method has a robust performance in terms of computational cost and the number of stars in the field of view(FOV) compared with the previous methods. Finally, certain affecting factors are analyzed, including lens distortion, star senor instantaneous FOV(IFOV), star number,and accuracy of the star sensor. | Xiaolin NING Zonghe DING Pingping CHEN Weiren WU Jiancheng FANG Gang LIU | 2018 | Science China(Information Sciences)2018，61，11： | 3 |
| 13 | Interplanetary transfers employing invariant manifolds and gravity assist between periodic orbits显示文摘The interest in the periodic orbits of the restricted three-body problem continues to grow for their significant practical application.This paper focuses on the interplanetary transfers between periodic orbits of two different three-body systems,whose invariant manifolds have no intersection in phase space.A novel design method is proposed to obtain the optimal transfer employing the invariant manifolds and planetary gravity assist.The periapsis Poincare map is used to analyze the periapsides of invariant manifolds.On the basis of hyperbola approximation,the impulses performed on the periapsis of invariant manifolds are calculated with a simple iterative algorithm.The propellant-efficient escape and capture trajectories can be found by comparing the impulses magnitudes corresponding to different invariant manifolds,which can provide the appropriate initial guess for optimization.Further,the trajectory design is formulated as an unconstrained optimization problem under the perturbed restricted three-body model.An efficient algorithm combining simplex method and differential correction is adopted to obtain the optimal solution.The validity of the proposed approach is demonstrated through several interplanetary low energy transfer trajectories. | WANG Shuai SHANG HaiBin WU WeiRen | 2013 | Chinese Science Bulletin2013，58，7： | 3 |
| 14 | NEW ITERATIVE SUPER-TRELLIS DECODING WITH SOURCE A PRIORI INFORMATION FOR VLCS WITH TURBO CODES显示文摘A novel Joint Source and Channel Decoding (JSCD) scheme for Variable Length Codes (VLCs) concatenated with turbo codes utilizing a new super-trellis decoding algorithm is presented in this letter. The basic idea of our decoding algorithm is that source a priori information with the form of bit transition probabilities corresponding to the VLC tree can be derived directly from sub-state transitions in new composite-state represented super-trellis. A Maximum Likelihood (ML) decoding algorithm for VLC sequence estimations based on the proposed super-trellis is also described. Simu-lation results show that the new iterative decoding scheme can obtain obvious encoding gain especially for Reversible Variable Length Codes (RVLCs),when compared with the classical separated turbo decoding and the previous joint decoding not considering source statistical characteristics. | Liu Jianjun Tu Guofang Wu Weiren | 2007 | Journal of Electronics(China)2007，24，1： | 3 |
| 15 | Recursive adaptive filter using current innovation for celestial navigation during the Mars approach phase显示文摘Celestial navigation is a commonly used autonomous navigation technique for deep space navigation.A nonlinear filter such as the unscented Kalman filter(UKF) is typically applied in a celestial navigation system(CNS). However, on account of being subject to a number of factors, such as ephemeris errors and centroid determination, the measurement model error of a CNS cannot be accurately determined. The analysis conducted in this study also shows that the measurement model error is time-variant during the Mars approach phase.This implies that covariance matrix of the measurement error R is usually inaccurate, which may induce large estimation errors that even result in filter divergence. Some adaptive methods are able to address this issue.However, traditional adaptive filters, for scaling R, usually require a sequence of innovation and are affected by the statistic window size. A new recursive adaptive UKF(RAUKF) is proposed in this paper, which only uses current innovation to scale R. The navigation performance of the proposed RAUKF method is compared with some traditional adaptive filters through simulations. The results show that this method is better than traditional adaptive filters in a CNS during the Mars approach phase. | Xiaolin NING Zhuo LI Weiren WU Yuqing YANG Jiancheng FANG Gang LIU | 2017 | Science China(Information Sciences)2017，60，3： | 3 |
| 16 | Will the Historic Southeasterly Wind over the Equatorial Pacific in March 2022 Trigger a Third-year La Niña Event?显示文摘Based on the updates of the Climate Prediction Center and International Research Institute for Climate and Society(CPC/IRI)and the China Multi-Model Ensemble(CMME)El Niño-Southern Oscillation(ENSO)Outlook issued in April 2022,La Niña is favored to continue through the boreal summer and fall,indicating a high possibility of a three-year La Niña(2020-23).It would be the first three-year La Niña since the 1998-2001 event,which is the only observed three-year La Niña event since 1980.By examining the status of air-sea fields over the tropical Pacific in March 2022,it can be seen that while the thermocline depths were near average,the southeasterly wind stress was at its strongest since 1980.Here,based on a quaternary linear regression model that includes various relevant air-sea variables over the equatorial Pacific in March,we argue that the historic southeasterly winds over the equatorial Pacific are favorable for the emergence of the third-year La Niña,and both the anomalous easterly and southerly wind stress components are important and contribute~50%of the third-year La Niña growth,respectively.Additionally,the possible global climate impacts of this event are discussed. | Xianghui FANG Fei ZHENG Kexin LI Zeng-Zhen HU Hongli REN Jie WU Xingrong CHEN Weiren LAN Yuan YUAN Licheng FENG Qifa CAI Jiang ZHU | 2023 | Advances in Atmospheric Sciences2023，40，1： | 2 |
| 17 | Joint source channel VL coding/decoding for deep space communication networks based on a space trellis显示文摘This paper presents joint source channel variable length (VL) coding/decoding based on a space trellis.Through constructing a joint decoding plane trellis,better decoding performance can be achieved than by using the bit-level decoding algorithm.However,the plane trellis is complicated,which results in high decoding complexity for decoding VL turbo codes.To solve this problem,we construct a space trellis and design a low-complexity joint decoding algorithm with a variable length symbol-a posteriori probability (VLS-APP) algorithm in resource constrained deep space communication networks.Simulation results show that the proposed approach reduces the decoding complexity by 10% compared with the plane trellis,and the gain of Eb/N0 is about 0.2 dB at SER=10-4.Furthermore,it provides substantial error protection for variable-length encoded image data. | WU WeiRen TU Juan TU GuoFang GAO ShaoShuai ZHANG Can | 2011 | Science China(Information Sciences)2011，54，9： | 2 |
| 18 | Scalable video object coding & QoS control for next generation space internet显示文摘The next generation space internet (NGSI) is based on all-IP-based mobile network that merges land-based network, sea-based network, sky-based network, spacebased network, deep space-based network together using existing assess network technologies. There are high signal propagation delays, high error rate, bandwidth variation and time-variety in NGSI. In order to adapt to various space communication environment constraints and bandwidth variation, we propose a reduced dimension scalable video coding scheme based on CCSDS IDCS algorithm and quality of service (QoS) control method by cross layer design (CLD). The experimental result shows that this new method has better performance than that of existing algorithms, and can be adaptive to the bandwidth variation dynamically. | TU GuoFang ZHANG Can HEINRICH Nimann XU Jie WU WeiRen | 2008 | Science in China(Series F)2008，51，5： | 2 |
| 19 | New celestial assisted INS initial alignment method for lunar explorer显示文摘In the future lunar exploration programs of China,soft landing,sampling and returning will be realized.For lunar explorers such as Rovers,Landers and Ascenders,the inertial navigation system(INS) will be used to obtain high-precision navigation information.INS propagates position,velocity and attitude by integration of sensed accelerations,so initial alignment is needed before INS can work properly.However,traditional ground-based initial alignment methods cannot work well on the lunar surface because of its low rotation rate(0.55%).For solving this problem, a new autonomous INS initial alignment method assisted by celestial observations is proposed,which uses star observations to help INS estimate its attitude,gyroscopes drifts and accelerometer biases.Simulations show that this new method can not only speed up alignment,but also improve the alignment accuracy.Furthermore, the impact factors such as initial conditions,accuracy of INS sensors,and accuracy of star sensor on alignment accuracy are analyzed in details,which provide guidance for the engineering applications of this method.This method could be a promising and attractive solution for lunar explorer’s initial alignment. | Weiren Wu Xiaolin Ning Lingling Liu | 2013 | Journal of Systems Engineering and Electronics2013，24，1： | 2 |
| 20 | Design, Synthesis and Biological Activity of Tetrazole-bearing Uric Acid Transporter 1 Inhibitors显示文摘 | CAI Wenqing LIU Wei XIE Yafei WU Jingwei LIU Yuqiang LIU Changying XU Weiren TANG Lida WANG Jianwu ZHAO Guilong | 2017 | Chemical Research in Chinese Universities2017，33，1： | 2 |
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