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| 1 | A Realization Method for Transforming a Topology Optimization Design into Additive Manufacturing Structures显示文摘 | Shutian Liu Quhao Li Junhuan Liu Wenjiong Chen Yongcun Zhang | 2018 | Engineering2018，4，2： | 16 |
| 2 | An efficient rendering method for large vector data on large terrain models显示文摘This paper presents an efficient way to render large-scale vector maps on level-of-detail(LOD) digital elevation models(DEMs).By using the frame buffer and Voronoi diagram,we achieve a rapid simplification of large-scale vector maps while keeping their original topological relationships.With the simplified maps,we establish level-of-detail vector map models.In the detailed level,we use the stencil shadow volume approach to render the map accurately,and in the coarse level we use substitute techniques to render the map approximately yet more quickly.The method proposed in this paper is universally applicable to rendering vector maps on various LOD terrain models,and the overlaying performance is independent of the complexity of underlying terrain surfaces.By use of the view frustum culling and sub-region index techniques,the impact of complexity of vector maps is reduced,and the rendering time is restricted to a certain scope.Thereby,we can achieve seamless and rapid rendering of large-scale vector maps on LOD terrain surfaces. | YANG Ling ZHANG LiQiang KANG ZhiZhong XIAO ZhiQiang PENG JunHuan ZHANG XingMing LIU Liu | 2010 | Science China(Information Sciences)2010，53，6： | 11 |
| 3 | 3D WATER-VAPOR TOMOGRAPHY WITH SHANGHAI GPS NETWORK TO IMPROVE FORECASTED MOISTURE FIELD显示文摘The vertical structure of water vapor in atmosphere is one of the initial information of numerical weather forecast model. Because of the strong variation of water vapor in atmosphere and limited spatio-temporal solutions of traditional ob- servation technique, the initial water vapor field of numerical weather forecast model can not accurately be described. At present, using GPS slant observa- tions to study water vapor profile is very popular in the world. Using slant water vapor(SWV) observa- tions from Shanghai GPS network,we diagnose the three-dimensional(3D) water vapor structure over Shanghai area firstly in China. In water vapor tomo- graphy, Gauss weighted function is used as horizon- tal constraint, the output of numerical forecast is used as apriori information, and boundary condition is also considered. For the problem without exact apriori weights for observations, estimation of variance components is introduced firstly in water vapor to- mography to determine posteriori weights. Robust estimation is chosen for reducing the effect of blun- ders on solutions. For the descending characteristic of water vapor with height increasing, non-equal weights are used along vertical direction. Compari- sons between tomography results and the profile provided by numerical model (MM5) show that the forecasted moisture fields of MM5 can be improved obviously by GPS slant water vapor. Using GPS slant observations to study 3D structure of atmosphere in near real-time is very important for improving initialwater vapor field of short-term weather forecast and enhancing the accuracy of numerical weather fore- cast. | SONG Shuli ZHU Wenyao DING Jincai PENG Junhuan | 2006 | Chinese Science Bulletin2006，51，5： | 10 |
| 4 | The apricot(Prunus armeniaca L.)genome elucidates Rosaceae evolution and beta-carotenoid synthesis显示文摘Apricots,scientifically known as Prunus armeniaca L,are drupes that resemble and are closely related to peaches or plums.As one of the top consumed fruits,apricots are widely grown worldwide except in Antarctica.A high-quality reference genome for apricot is still unavailable,which has become a handicap that has dramatically limited the elucidation of the associations of phenotypes with the genetic background,evolutionary diversity,and population diversity in apricot.DNA from P.armeniaca was used to generate a standard,size-selected library with an average DNA fragment size of~20 kb.The library was run on Sequel SMRT Cells,generating a total of 16.54 Gb of PacBio subreads(N50=13.55 kb).The high-quality P.armeniaca reference genome presented here was assembled using long-read single-molecule sequencing at approximately 70×coverage and 171×Illumina reads(40.46 Gb),combined with a genetic map for chromosome scaffolding.The assembled genome size was 221.9 Mb,with a contig NG50 size of 1.02 Mb.Scaffolds covering 92.88%of the assembled genome were anchored on eight chromosomes.Benchmarking Universal Single-Copy Orthologs analysis showed 98.0%complete genes.We predicted 30,436 protein-coding genes,and 38.28%of the genome was predicted to be repetitive.We found 981 contracted gene families,1324 expanded gene families and 2300 apricot-specific genes.The differentially expressed gene(DEG)analysis indicated that a change in the expression of the 9-cis-epoxycarotenoid dioxygenase(NCED)gene but not lycopene beta-cyclase(LcyB)gene results in a lowβ-carotenoid content in the white cultivar“Dabaixing”.This complete and highly contiguous P.armeniaca reference genome will be of help for future studies of resistance to plum pox virus(PPV)and the identification and characterization of important agronomic genes and breeding strategies in apricot. | Fengchao Jiang Junhuan Zhang Sen Wang Li Yang Yingfeng Luo Shenghan Gao Meiling Zhang Shuangyang Wu Songnian Hu Haoyuan Sun Yuzhu Wang | 2019 | Horticulture Research2019，6，1： | 9 |
| 5 | An improved EM algorithm for remote sensing classification显示文摘The use of a general EM(expectation-maximization) algorithm in multi-spectral image classification is known to cause two problems:singularity of the variance-covariance matrix and sensitivity of randomly selected initial values.The former causes computation failure;the latter produces unstable classification results.This paper proposes a modified approach to resolve these defects.First,a modification is proposed to determine reliable parameters for the EM algorithm based on a k-means algorithm with initial centers obtained from the density function of the first principal component,which avoids the selection of initial centers at random.A second modification uses the principal component transformation of the image to obtain a set of uncorrelated data.The number of principal components as the input of the EM algorithm is determined by the principal contribution rate.In this way,the modification can not only remove singularity but also weaken noise.Experimental results obtained from two sets of remote sensing images acquired by two different sensors confirm the validity of the proposed approach. | YANG HongLei PENG JunHuan XIA BaiRu ZHANG DingXuan | 2013 | Chinese Science Bulletin2013，58，9： | 5 |
| 6 | Fuel design real-time to control HCCI combustion显示文摘In order to achieve lower emissions and extensive load in the homogeneous charge com- pression ignition (HCCI) engine system, a novel fuel design concept that high-octane number fuel and high-cetane number fuel are mixed real-time to con- trol HCCI combustion is proposed in this study. HCCI combustion fueled with iso-octane/n-heptane mix- tures controlled real-time on a single-cylinder HCCI combustion engine is studied. The test results show that the equivalence ratio of n-heptane in mixtures decides ignition and controls the combustion phase of HCCI combustion. The addition of iso-octane ex- tends knocking limit in equivalence ratio somewhat, but knocking occurrence mainly depends on the total concentration of mixture. Although operating range in equivalence ratio becomes narrow with the increas- ing proportion of iso-octane, the maximum load of HCCI combustion fueled with iso-octane/n-heptane mixtures controlled real-time is increased about 80% more than that of pure n-heptane. When iso-octane/ n-heptane mixtures are controlled in optimized method, it is proved that the load of HCCI combustion can be fully extended and emissions can be de- creased remarkably, while at the same time the higher indicated thermal efficiencies are obtained over the extensive operation range. | HOU Yuchun HUANG Zhen LU Xingcai FANG Junhuan ZU Linlin | 2006 | Chinese Science Bulletin2006，51，21： | 3 |
| 7 | Fast and dynamic generation of linear octrees for geological bodies under hardware acceleration显示文摘In the application of 3D Geoscience Modeling,we often need to generate the volumetric representations of geological bodies from their surface representations.Linear octree,as an efficient and easily operated volumetric model,is widely used in 3D Geoscience Modeling.This paper proposes an algorithm for fast and dynamic generation of linear octrees of geological bodies from their surface models under hardware acceleration.The Z-buffers are used to determine the attributes of octants and voxels in a fast way,and a divide-and-conquer strategy is adopted.A stack structure is exploited to record the subdivision,which allows generating linear octrees dynamically.The algorithm avoids large-scale sorting process and bypasses the compression in linear octrees generation.Experimental results indicate its high efficiency in generating linear octrees for large-scale geologic bodies. | DENG Hao ZHANG LiQiang MAO XianCheng MA JingTao KANG ZhiZhong PENG JunHuan RUI XiaoPing LIU Liu | 2010 | Science China Earth Sciences2010，53，1： | 2 |
| 8 | Jointly Robust Estimation of Unknown Parameters and Variance Components Based on Expecta tion-maximization Algorithm 显示文摘 | PENG Junhuan | 2009 | Journal of Surveying Engineering2009，135，1： | 1 |
| 9 | The Asymptotic Variance-Covariance Matrix, Baarda Test and the Reliability of L1-Norm Estimates显示文摘 | Peng Junhuan | 2005 | Journal of Geodesy2005，78，1112： | 1 |
| 10 | An Aggregate Constraint Method for Inequality-constrained Least Squares Problems 显示文摘 | Peng Junhuan | 2006 | Journal of Geodesy2006，79，12： | 1 |
| 11 | An Aggregate Constraint Method for Inequality-constrained Least Squares Problems显示文摘 | Junhuan Peng Hongping Zhang Suli Shong Chunxi Guo | 2006 | Journal of Geodesy2006，，12： | 1 |
| 12 | Time series modeling and analysis of trends of daily averaged ionospher- ic total electron content 显示文摘 | Li Shuhui Peng Junhuan Xu Weichao | 2013 | Advances in Space Research2013，52，5： | 1 |
| 13 | On a New Queue Backoff Fair Algorithm for Ad Hoc Networks显示文摘 | Junhuan FENG Pingzhi FAN | 2003 | Proceedings of IEEE PDCAT2003，，5： | 1 |
| 14 | An Aggregate Constraint Method for Inequality- Constrained Least Squares Problems显示文摘 | PENG Junhuan GUO Cbunxi ZHANG Hongping et aI | 2006 | J Geod2006，79，12： | 1 |
| 15 | An Aggregate Constraint Method for Inequality-constrained Least Squares Problem显示文摘 | PENG Junhuan | 2006 | Journal of Geodesy2006，79，12： | 1 |
| 16 | The Asymptotic Variance-covariance Matrix, Baarda Testing and the Reliability of L1 Norm Estimates显示文摘 | PENG Junhuan | 2005 | J Geod2005，78，1112： | 1 |
| 17 | MINQUE of Variance-Covariance Components in Linear Gauss-Markov Models 显示文摘 | PENG Junhuan SHI Yun LI Shuhui | 2011 | Journal of Surveying Engineering2011，137，4： | 1 |
| 18 | Improvement of chilling tolerance and accumulation of heat shock proteins in grape berries ( Vitis vinifera cv. Jingxiu) by heat pretreatment显示文摘 | Junhuan Zhang Weidong Huang Qiuhong Pan Yueping Liu | 2005 | Postharvest Biology and Technology2005，，1： | 1 |
| 19 | The lanthanum and the ammonium become lucky rhodopseudomonas capsulate growth, kind of carrot element production and nitrogen fixation active influence 显示文摘 | Cheu Shengrning Xu Junhuan | 1995 | Acta Micrologic Sinica1995，35，5： | 1 |
| 20 | InSAR measurements of surface deformation over permafrost on Fenghuoshan Mountains section,Qinghai-Tibet Plateau显示文摘The permafrost development in the Qinghai-Tibet Engineering Corridor(QTEC)is affected by natural environment changes and human engineering activities.Human engineering activities may damage the permafrost growing environment,which in turn impact these engineering activities.Thus high spatial-temporal resolution monitoring over the QTEC in the permafrost region is very necessary.This paper presents a method for monitoring the frozen soil area using the intermittent coherencebased small baseline subset(ICSBAS).The method can improve the point density of the results and enhance the interpretability of deformation results by identifying the discontinuous coherent points according to the coherent value of time series.Using the periodic function that models the seasonal variation of permafrost,we separate the long wavelength atmospheric delay and establish an estimation model for the frozen soil deformation.Doing this can raise the monitoring accuracy and improve the understanding of the surface deformation of the frozen soil.In this study,we process 21 PALSAR data acquired by the Alos satellite with the proposed ICSBAS technique.The results show that the frozen soil far from the QTR in the study area experiences frost heave and thaw settlement(4.7 cm to8.4 cm)alternatively,while the maximum settlement along the QTR reaches 12 cm.The interferomatric syntnetic aperture radar(InSAR)-derived results are validated using the ground leveling data nearby the Beiluhe basin.The validation results show the InSAR results have good consistency with the leveling data in displacement rates as well as time series.We also find that the deformation in the permafrost area is correlated with temperature,human activities and topography.Based on the interfering degree of human engineering activities on the permafrost environment,we divide the QTEC along the Qinghai-Tibet Railway into engineering damage zone,transition zone and natural permafrost. | YANG Honglei JIANG Qiao HAN Jianfeng KANG Ki-Yeob PENG Junhuan | 2021 | Journal of Systems Engineering and Electronics2021，32，6： | 0 |
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