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| 1 | MIMO雷达检测性能显示文摘为了充分利用多入多出(multiple input multipleoutput,MIMO)雷达的空间分集技术,同时使其便于设计和实现,论文基于目标的分布源模型,在Neyman-Pearson准则下研究当MIMO雷达分集路径不完全独立时的检测方法和性能,并且利用主分量分析的思想简化了检测方法。该方法通过特征值分解,从M个正交信号中提取出独立观测分量并将其加权合并。仿真结果表明:与传统雷达相比,只要存在2个以上的独立观测分量,MIMO雷达可以更有效地对抗目标RCS(radar cross section)闪烁。同时,当发射阵元间距减小为理想条件的1/4时,MIMO雷达仍然可以利用空间分集提高其检测性能。 | 戴喜增 彭应宁 汤俊 | 2007 | 清华大学学报(自然科学版)2007，47，1： | 46 |
| 2 | Arsenic trioxide induces multiple myeloma cell apoptosis via disruption of mitochondrial transmembrane potentials and activation of caspase-3显示文摘investigate the response of multiple myeloma (MM) cells to arsenic trioxide (As 2O 3) and their possible mechanisms Methods Two MM derived cell lines RPMI8226 and U266 cells were used as in vitro models Cell apoptosis was assessed by morphology, flow cytometry, and DNA gel electrophoresis Mitochondrial transmembrane potentials (△Ψm) were evaluated by measuring cellular Rhodamine 123 staining intensity Protein expression was analyzed using Western blot Results Zero point one to 0 5?μmol/L As 2O 3 inhibited cell proliferation and 2.0?μmol/L As 2O 3 induced cell apoptosis, while 1.0?μmol/L As 2O 3 inhibited proliferation with a weak degree of apoptosis induction in RPMI8226 and U266 cell lines As 2O 3 induced apoptosis was accompanied by mitochondrial transmembrane potentials (△Ψm) collapse and caspase 3 activation in the presence of intact membrane Glutathione depleter buthionine sulfoximine enhanced, while disulfide bond reducing agent dithiothreitol partially antagonized As 2O 3 induced △Ψm collapse and apoptosis in MM cells All trans retinoic acid (ATRA) could also induce apoptosis in RPMI8226 cells, but it did not show any cooperative effects with As 2O 3 Conclusion As 2O 3 exerts apoptosis inducing and growth inhibiting effects on MM cells, and mitochondrium is a pivotal and common target of As 2O 3 for apoptosis | 贾培敏 陈国强 黄晓君 蔡循 杨洁 王龙 周宇红 沈玉雷 周励 余韵 陈赛娟 张学光 王振义 | 2001 | Chinese Medical Journal2001，，1： | 36 |
| 3 | Pathological changes at early stage of multiple organ injury in a rat model of severe acute pancreatitis显示文摘BACKGROUND:Severe acute pancreatitis (SAP) is a commonly seen acute abdominal syndrome characterized by sudden onset,rapid progression and high mortality rate.The damage in peripheral organs may be more severe than that in the pancreas,and can even lead to multiple organ dysfunction.It is critical to recognize early pathological changes in multiple organs.This study aimed to assess the early pathological features of damaged organs in a rat model of SAP.METHODS:Thirty clean grade healthy male Sprague-Dawley rats weighing 250-300 g were randomly divided into a model control group (n=15) and a sham-operated group (n=15).The SAP rat model was induced by sodium taurocholate.Samples of blood and from multiple organs were collected 3 hours after operation.We assessed the levels of IL-6,TNF-α,PLA2,NO,ET-1,MDA,amylases and endotoxin in blood and observed the early pathological changes in multiple damaged organs.RESULTS:Levels of IL-6,TNF-α,PLA2,NO,ET-1 and MDA in serum and of amylase and endotoxin in plasma of the model control group rats were significantly higher than those of the sham-operated group (P<0.01).Different degrees of pathological change were observed in multiple damaged organs.CONCLUSION:Multiple organ injury may occur at the early stage of SAP in rats. | Zhang, Xi-Ping Zhang, Jie Ma, Mei-Li Cai, Yang Xu, Ru-Jun Xie, Qi Jiang, Xin-Ge Ye, Qian | 2010 | Hepatobiliary & Pancreatic Diseases International2010，9，1： | 33 |
| 4 | Max-Min Adaptive Ant Colony Optimization Approach to Multi-UAVs Coordinated Trajectory Replanning in Dynamic and Uncertain Environments显示文摘Multiple Uninhabited Aerial Vehicles (multi-UAVs) coordinated trajectory replanning is one of the most complicatedglobal optimum problems in multi-UAVs coordinated control. Based on the construction of the basic model of multi-UAVscoordinated trajectory replanning, which includes problem description, threat modeling, constraint conditions, coordinatedfunction and coordination mechanism, a novel Max-Min adaptive Ant Colony Optimization (ACO) approach is presented indetail. In view of the characteristics of multi-UAVs coordinated trajectory replanning in dynamic and uncertain environments,the minimum and maximum pheromone trails in ACO are set to enhance the searching capability, and the point pheromone isadopted to achieve the collision avoidance between UAVs at the trajectory planner layer. Considering the simultaneous arrivaland the air-space collision avoidance, an Estimated Time of Arrival (ETA) is decided first. Then the trajectory and flight velocityof each UAV are determined. Simulation experiments are performed under the complicated combating environment containingsome static threats and popup threats. The results demonstrate the feasibility and the effectiveness of the proposed approach. | Hai-bin Duan,Xiang-yin Zhang,Jiang Wu,Guan-jun MaSchool of Automation Science and Electrical Engineering,Beihang University,Beijing 100191,P.R.China | 2009 | Journal of Bionic Engineering2009，6，2： | 33 |
| 5 | Suppression of P-gp induced multiple drug resistance in a drug resistant gastric cancer cell line by overexpression of Fas显示文摘AIM To observe the drug sensitizing effect andrelated mechanisms of fas gene transduction onhuman drug-resistant gastric cancer cellSGC7901/VCR(resistant to Vincristine).METHODS The cell cycle alteration wasobserved by FACS.The sensitivity of gastriccancer cells to apoptosis was determined by invitro apoptosis assay.The drug sensitization ofcells to several anti-tumor drugs was observedby MTT assay.Immunochemical method wasused to show expression of P-gp and Topo Ⅱ ingastric cancer cells.RESULTS Comparing to SGC7901 and pBK-SGC7901/VCR,fas-SGC7901/VCR showeddecreasing G2 cells and increasing S cells,theG2 phase fraction of pBK-SGC7901/VCR wasabout 3.0 times that of fas-SGC7901/VCR,but Sphase fraction of fas-SGC7901/VCR was about1.9 times that of pBK-SGC7901/VCR,indicatingS phase arrest of fas-SGC7901/VCR.FACS alsosuggested apoptosis of fas-SGC7901/VCR,fas-SGC7901/VCR was more sensitive to apoptosisinducing agent VM-26 than pBK-SGC7901/VCR.MTT assay showed increased sensitization offas-SGC7901/VCR to DDP,MMC and 5-FU,butsame sensitization to VCR according to pBK-SGC7901/VCR.SGC7901,pBK-SGC7901/ VCRand fas-SGC7901/VCR had positively stainedTopo Ⅱ equally.P-gp staining in pBK- SGC7901/VCR was stronger than in SG07901,but there was little staining of P-gp in fas.SGC7901/VCR.CONCLUSION fas gene transduction couldreverse the MDR of human drug-resistant gastriccancer cell SGC7901/VCR to a degree,possiblybecause of higher sensitization to apoptosis anddecreased expression of P-gp. | Yin F Shi YQ Zhao WP Xiao B Miao JY Fan DM | 2000 | World Journal of Gastroenterology2000，6，5： | 24 |
| 6 | Transduction of Fas gene or Bcl-2 antisense RNA sensitizes cultured drug resistant gastric cancer cells to chemotherapeutic drugs显示文摘INTRODUCTIONChemotherapyisoneofthemajormethodsintumortreatment,butitoftendoesnotworkduetomultidrugresistance(MDR).Recentstudi... | XIAO Bing, SHI Yong Quan, ZHAO Yan Qiu, YOU Han, WANG Zuo You, LIU Xian Ling, YIN Fang, QIAO Tai Dong and FAN Dai Ming | 1998 | World Journal of Gastroenterology1998，4，5： | 24 |
| 7 | Arterial spin labeling in neuroimaging显示文摘Arterial spin labeling(ASL) is a magnetic resonance imaging technique for measuring tissue perfusion using a freely diffusible intrinsic tracer.As compared with other perfusion techniques,ASL offers several advantages and is now available for routine clinical practice in many institutions.Its noninvasive nature and ability to quantitatively measure tissue perfusion make ASL ideal for research and clinical studies.Recent technical advances have increased its sensitivity and also extended its potential applications.This review focuses on some basic knowledge of ASL perfusion,emerging techniques and clinical applications in neuroimaging. | Sasitorn Petcharunpaisan Joana Ramalho Mauricio Castillo | 2010 | World Journal of Radiology2010，2，10： | 23 |
| 8 | The necessary and sufficient conditions for returns to scale properties in generalized data envelopment analysis model显示文摘We give definitions on increasing, constant and decreasing returns to scale under thegeneralized data envelopment analysis (GDEA) model. The GDEA model possesses cone structures fordescribing evaluators' preferences toward different decision making units (DMU) and toward differentinput/output categories. The GDEA model contains many important DEA models as its subclasses.Based upon the definition, we discuss and rigorously prove the necessary and sufficient conditionsfor a DMU to have increasing, constant and decreasing returns to scale under a GDEA model, anddiscuss and clarify the differences and relationships of these conditions under different subclasses ofthe GDEA model. Furthermore, we describe a method based on a two-stage linear program to testreturns to scale properties. | 魏权龄 于刚 陆剑受 | 2002 | Science China(Technological Sciences)2002，45，5： | 21 |
| 9 | Estimating forest aboveground biomass using HJ-1 Satellite CCD and ICESat GLAS waveform data显示文摘The ecosystem in northeastern China and the Russian Far East is a hotspot of scientific research into the global carbon balance.Forest aboveground biomass(AGB) is an important component in the land surface carbon cycle.In this study,using forest inventory data and forest distribution data,the AGB was estimated for forest in Daxinganlin in northeastern China by combining charge-coupled device(CCD) data from the Small Satellite for Disaster and Environment Monitoring and Forecast(HJ-1) and Geoscience Laser Altimeter System(GLAS) waveform data from the Ice,Cloud and land Elevation Satellite(ICESat).The forest AGB prediction models were separately developed for different forest types in the research area at GLAS footprint level from GLAS waveform parameters and field survey plot biomass in the Changqing(CQ) Forest Center,which was calculated from forest inventory data.The resulted statistical regression models have a R2=0.68 for conifer and R2=0.71 for broadleaf forests.These models were used to estimate biomass for all GLAS footprints of forest located in the study area.All GLAS footprint biomass coupled with various spectral reflectivity parameters and vegetation indices derived from HJ-1 satellite CCD data were used in multiple regression analyses to establish biomass prediction models(R2=0.55 and R2=0.52 for needle and broadleaf respectively).Then the models were used to produce a forest AGB map for the whole study area using the HJ-1 data.Biomass data obtained from forest inventory data of the Zhuanglin(ZL) Forest Center were used as independent field measurements to validate the AGB estimated from HJ-1 CCD data(R2=0.71).About 80% of biomass samples had an error less than 20 t ha-1,and the mean error of all validation samples is 5.74 t ha-1.The pixel-level biomass map was then stratified into different biomass levels to illustrate the AGB spatial distribution pattern in this area.It was found that HJ-1 wide-swath data and GLAS waveform data can be combined to estimate forest biomass with good precision,and the biomass data can be used as input data for future carbon budget analysis. | GUO ZhiFeng1,CHI Hong1,2 & SUN GuoQing1,3 1State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University,Institute of Remote Sensing Applications,Chinese Academy of Sciences,Beijing 100101,China 2Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3Department of Geography University of Maryland,College Park,MD 20742,USA | 2010 | Science China Earth Sciences2010，53，S1： | 21 |
| 10 | Collision free 4D path planning for multiple UAVs based on spatial refined voting mechanism and PSO approach显示文摘In this paper, a four-dimensional coordinated path planning algorithm for multiple UAVs is proposed, in which time variable is taken into account for each UAV as well as collision free and obstacle avoidance. A Spatial Refined Voting Mechanism(SRVM) is designed for standard Particle Swarm Optimization(PSO) to overcome the defects of local optimal and slow convergence.For each generation candidate particle positions are recorded and an adaptive cube is formed with own adaptive side length to indicate occupied regions. Then space voting begins and is sorted based on voting results, whose centers with bigger voting counts are seen as sub-optimal positions. The average of all particles of corresponding dimensions are calculated as the refined solutions. A time coordination method is developed by generating specified candidate paths for every UAV, making them arrive the same destination with the same time consumption. A spatial-temporal collision avoidance technique is introduced to make collision free. Distance to destination is constructed to improve the searching accuracy and velocity of particles. In addition, the objective function is redesigned by considering the obstacle and threat avoidance, Estimated Time of Arrival(ETA), separation maintenance and UAV self-constraints. Experimental results prove the effectiveness and efficiency of the algorithm. | Yang LIU Xuejun ZHANG Yu ZHANG Xiangmin GUAN | 2019 | Chinese Journal of Aeronautics2019，32，6： | 20 |
| 11 | Imaging of multiple myeloma: Current concepts显示文摘Medical imaging is of crucial importance for diagnosis and initial staging as well as for differentiation of multiple myeloma(MM)from other monoclonal plasma cell diseases.Conventional radiography represents the reference standard for diagnosis of MM due to its wide availability and low costs despite its known limitations such as low sensitivity,limited specificity and its inability to detect extraosseous lesions.Besides conventional radiography,newer cross-sectional imaging modalities such as whole-body low-dose computed tomography(CT),whole-body magnetic resonance imaging(MRI)and18F-fluorodeoxyglucose(FDG)positron emission tomography(PET)/CT are available for the diagnosis of osseous and extraosseous manifestations of MM.Whole-body low-dose CT is used increasingly,replacing conventional radiography at selected centers,due to its higher sensitivity for the detection of osseous lesions and its ability to diagnose extraosseous lesions.The highest sensitivity for both detection of bone marrow disease and extraosseous lesions can be achieved with whole-body MRI and18F-FDG PET/CT.According to current evidence,MRI is the most sensitive method for initial staging while18F-FDG PET/CT allows monitoring of treatment of MM.There is an evolving role for assessment of treatment response using newer MR imagingtechniques.Future studies are needed to further define the exact role of the different imaging modalities for individual risk stratification and therapy monitoring. | Thorsten Derlin Peter Bannas | 2014 | World Journal of Orthopedics2014，5，3： | 20 |
| 12 | The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics显示文摘The front of the Zoulang Nanshan Caledonian volcanic island arc zone in the northern Qilian Mountains is a forearc accretionary terrane, composed of multiple accretionary volcanic island arcs, flysch accretionary wedges,high-pressure metamorphosed detachment zones and remnants of ophiolites. It resulted from the northeastward subduction of the Early Palaeozoic Qilan oceanic crust beneath the Alxa block. High-pressure metamorphism, which occurred during the subduction, progressed through three stages: the initial stage of medium T-high P,the main stage of temperature decrease and pressure increase, and the lag stage of pressure decrease and temperature increase. Finally the paper presents a retrotrench subduction dynamic model indicative of northward subduction of the central Qilian block and southward accretion of the Alxa block during the period of 450-500 Ma. | Xu Zhiqin, Xu Huifen, Zhang Jianxin, Li Haibing, Zhu Zhizhi, Qu Jingchuan,Institute of Geology, Chinese Academy of Geological Sciences, BeijingChen Daizhang, Chen Jinlu, China University of Geosciences, Beijingand Yang KaichunNo. 2 Q ilian Geological Party, Bureau of Geology and Mineral Resources of Q inghai Province, Q ilian County, Q inghai | 1994 | Acta Geologica Sinica(English Edition)1994，68，3： | 19 |
| 13 | The Number of Positive Pelvic Lymph Nodes and Multiple Groups of Pelvic Lymph Node Metastasis Influence Prognosis in Stage ⅠA-ⅡB Cervical Squamous Cell Carcinoma显示文摘 | Yu Liu Li-Jon Zhao Ming-Zho Li Ming-Xia Li Jian-Liu Wang Li-Hui Wei | 2015 | Chinese Medical Journal2015，，15： | 18 |
| 14 | Virus-induced accumulation of intracellular bile acids activates the TGR5-β-arrestin-SRC axis to enable innate antiviral immunity显示文摘The mechanisms on metabolic regulation of immune responses are still elusive. We show here that viral infection induces immediate-early NF-kB activation independent of viral nucleic acid-triggered signaling, which triggers a rapid transcriptional induction of bile acid (BA) transporter and rate-limiting biosynthesis enzymes as well as accumulation of intracellular BAs in divergent cell types. The accumulated intracellular BAs activate SRC kinase via the TGR5-GRK-卩-arrestin axis, which mediates tyrosine phosphorylation of multiple antiviral signaling components including RIG-I, VISA/MAVS, MITA/STING, TBK1 and IRF3. The tyrosine phosphorylation of these components by SRC conditions for efficient innate antiviral immune response. Consistently, TGR5 deficiency impairs innate antiviral immunity, whereas BAs exhibit potent antiviral activity in wild-type but not TGR5-deficient cells and mice. Our fin dings reveal an intrinsic and un iversal role of intracellular BA metabolism in innate antiviral immunity. | Ming-Ming Hu Wen-Rui He Peng Gao Qing Yang Ke He Li-Bo Cao Shu Li Yu-Qi Feng Hong-Bing Shu | 2019 | Cell Research2019，29，3： | 18 |
| 15 | Abnormal expression of hepatoma- derived γ-glutamyltransferase subtyping and its early alteration for carcinogenesis of hepatocytes显示文摘BACKGROUND: Although the hepatoma-specific band of gamma-glutamyltransferase ( GGT ) is a highly sensitive marker in diagnosis of hepatocellular carcinoma, the kine- tic expression and the early alterations of GGT in the deve- lopment of hepatoma remain unclear. In this study, we in- vestigated the expression and the alterations of GGT multi- ple molecular forms in hepatotumorigenesis. METHODS: The expression of GGT in a chemically in- duced hepatocarcinogenesis model was examined by giving 0. 05% of 2-fluoenylacetamide in diet for 12 weeks. The ex- pression levels of total RNA and GGT, and the changes of liver pathology, GGT multiple molecular forms and sugar- chain heterogeneity were investigated at the different stages of rat hepatoma development. RESULTS: Pathological examination and biochemical ana- lysis found that liver GGT was over-expressed and secreted into blood during canceration. Serum total GGT and liver GGT specific activities (IU/g) including soluble and mem- brane-combined GGT were significantly higher (P <0.05) in experimental groups than those in control group, respec- tively. A highly positive correlation was found between to- tal GGT activities and total RNA levels (r =0.90, P <0.05) of the liver. Both were higher six weeks later than before. Con A-non-reactive-GGT was increased consistantly dur- ing the development of rat hepatoma. GGT multiple mo- lecular forms in the liver and sera of experimental rats showed that fetal liver-type GGT bands were associated with the development of hepatoma. CONCLUSIONS: Fetal liver-type GGT in sera and the liver of rats is closely related to hepatotumorigenesis. It can be used as a sensitive enzymatic marker for the early diagnosis of liver cancer. | Deng-Fu Yao, Zhi-Zhen Dong, Deng-Bing Yao, Xin-Hua Wu, Wei Wu, Li-Wei Qiu, Hong-Mei Wang and Xian-Yong Meng Nantong, China Research Center of Clinical Molecular Biology, Affilia- ted Hospital of Nantong University, Nantong 226001 , China Insti- tute of Neuroscicnces, Nantong University, Nantong 226001 , China | 2004 | Hepatobiliary & Pancreatic Diseases International2004，3，4： | 17 |
| 16 | Characteristics and prognosis of synchronous multiple early gastric cancer显示文摘AIM:To assess the clinicopathologic characteristics,risk factors,and prognosis for synchronous multiple early gastric cancer(SMGC).METHODS:A total of 146 patients with SMGC and1194 patients with single gastric cancer who had undergone gastrectomy between 1989 and 2008 were retrospectively analyzed to determine their clinicopathologic characteristics and postoperative survival.Tumors were classified into groups on the basis of location and histology.Smoking habits were evaluated using the Brinkman index.Clinical and pathological factors were compared using either Fisher’s exact test or Pearson’sχ2test.Logistic regression analysis was performed to identify independent risk factors.Survival rate was calculated using the Kaplan-Meier method.RESULTS:SMGCs accounted for 10.9%of gastric cancer cases and occurred predominantly in elderly male patients with a family history of gastric cancer who were both smokers and drinkers.These tumors were typically macroscopically elevated and histologically differentiated.There were no significant differences between SMGC and single gastric cancer patients with respect to tumor location,tumor size,lymph node metastasis,the number of metastatic lymph nodes,venous invasion,or tumor stage(P=0.052,P=0.347,P=0.595,P=0.805,P=0.559,and P=0.408,respectively).Further,there was no significant difference in postoperative survival between the patient groups(P=0.200).Of the 146SMGC patients,a single patient had remnant cancer.CONCLUSION:A careful preoperative endoscopy is necessary for patients who are at high risk of SMGC,and minimally invasive treatment may be indicated in some cases. | Taro Isobe Kousuke Hashimoto Junya Kizaki Naotaka Murakami Keishiro Aoyagi Kikuo Koufuji Yoshito Akagi Kazuo Shirouzu | 2013 | World Journal of Gastroenterology2013，19，41： | 17 |
| 17 | The concept of effective emissivity of nonisothermal mixed pixel and its test显示文摘Based on two preconditions, the local thermal equilibrium is satisfied and emissivities donot change with temperature, the concept of component effective emissivity of nonisothermal mixed pixel has been put forward and then the radiant directionality model of nonisothermal mixed pixel constructed from it. Our study shows that the component effective emissivity is associated with geometric structure, optical properties of target, and viewing angle, but does not depend on the component temepratures. The component temperatures can only change the ratio of component radiance to the total radiance of the mixed-pixel. The total effective emissivity of this pixel is the complement of its directional-hemisphere reflectance. After the simulation of component effective emissivity of the discrete cones and continuous vegetation canopy (winter wheat) by the Monte Carlo method, our model of radiant directionality of nonisothermal mixed pixel have been proved by lab and field measurements. | CHEN Liangfu ZHUANG Jiali XU Xiru NIU Zheng ZHANG Renhua XIANG Yueqing | 2000 | Chinese Science Bulletin2000，45，9： | 17 |
| 18 | Qingyi decoction protects against myocardial injuries induced by severe acute pancreatitis显示文摘BACKGROUND We studied the protective effects of Qingyi decoction(QYD)(a Traditional Chinese Medicine)against severe acute pancreatitis(SAP)-induced myocardial infarction(MI).AIM To study the function and mechanism of QYD in the treatment of myocardial injuries induced by SAP.METHODS Ultrasonic cardiography,hematoxylin and eosin staining,immunohistochemistry,qRT-PCR,western blot,enzyme-linked immunosorbent assays,and apoptosis staining techniques were used to determine the effects of QYD following SAP-induced MI in Sprague-Dawley rats.RESULTS Our SAP model showed severe myocardial histological abnormalities and marked differences in the symptoms,mortality rate,and ultrasonic cardiography outputs among the different groups compared to the control.The expression of serum cytokines[interleukin(IL)-1?,IL-6,IL-8,IL-12,amyloidβ,and tumor necrosis factor-α]were significantly higher in the SAP versus QYD treated group(P<0.05 for all).STIM1 and Orai1 expression in myocardial tissue extracts were significantly decreased post QYD gavage(P<0.001).There was no significant histological difference between the 2-aminoethyl diphenylborinate inhibitor and QYD groups.The SAP group had a significantly higher apoptosis index score compared to the QYD group(P<0.001).CONCLUSION QYD conferred cardio-protection against SAP-induced MI by regulating myocardial-associated protein expression(STIM1 and Orai1). | Lei Li Yong-Qi Li Zhong-Wei Sun Cai-Ming Xu Jun Wu Ge-Liang Liu Ahmed MH Bakheet Hai-Long Chen | 2020 | World Journal of Gastroenterology2020，26，12： | 17 |
| 19 | Advanced technology of high-resolution radar: target detection, tracking, imaging, and recognition显示文摘In recent years, the performances of radar resolution, coverage, and detection accuracy have been significantly improved through the use of ultra-wideband, synthetic aperture and digital signal processing technologies. High-resolution radars(HRRs) utilize wideband signals and synthetic apertures to enhance the range and angular resolutions of tracking, respectively. They also generate one-, two-, and even threedimensional high-resolution images containing the feature information of targets, from which the targets can be precisely classified and identified. Advanced signal processing algorithms in HRRs obtain important information such as range-Doppler imaging, phase-derived ranging, and micro-motion features. However, the advantages and applications of HRRs are restricted by factors such as the reduced signal-to-noise ratio(SNR)of multi-scatter point targets, decreased tracking accuracy of multi-scatter point targets, high demands of motion compensation, and low sensitivity of the target attitude. Focusing on these problems, this paper systematically introduces the novel technologies of HRRs and discusses the issues and solutions relevant to detection, tracking, imaging, and recognition. Finally, it reviews the latest progress and representative results of HRR-based research, and suggests the future development of HRRs. | Teng LONG Zhennan LIANG Quanhua LIU | 2019 | Science China(Information Sciences)2019，62，4： | 17 |
| 20 | Design of integrated radar and communication system based on MIMO-OFDM waveform显示文摘Orthogonal frequency division multiplexing(OFDM)waveform enables radar and communication functions simultaneously, which encounters low angle resolution and poor data rate for traditional single input single output(SISO) systems. To solve these problems, an integrated radar and communication system(IRCS) with multiple input multiple output(MIMO) OFDM waveform is proposed. The different limitations of radar and communication in designing such a system are investigated. Then, an optimization problem is devised to obtain suitable system parameters, including the number of subcarriers, subcarrier spacing, number of symbols,pulse repetition frequency(PRF) and length of cyclic prefix(CP).Finally, to satisfy the requirements of both radar and communication, the IRCS parameters are derived in three typical cases.Several numerical results are presented to illustrate the demands of radar and communication, inconsistent or consistent, for the IRCS parameters and the superiority of the proposed system. | Yongjun Liu Guisheng Liao Zhiwei Yang Jingwei Xu | 2017 | Journal of Systems Engineering and Electronics2017，28，4： | 16 |
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