Design for a Dual-Frequency Antenna-in-Package

Li Li,Liping Han,Guorui Han,Xinwei Chen,Yanfeng Geng,Wenmei Zhang 한국전자통신연구원 2010 ETRI Journal Vol.32 No.4

For an antenna-in-package (AiP), via holes are used to connect the antenna ground and system ground. In this letter, a dual-frequency AiP with a U-slot embedded in the patch is proposed. By properly arranging three via holes under the non-radiating edge, an AiP with two resonant frequencies is realized. Then a U-slot is embedded in the patch to further improve the bandwidth of the AiP. To validate the proposed design, an AiP with the bandwidth of 4.49% at 2.45 GHz and 6.02% at 5.32 GHz is achieved and fabricated. The measured results agree with the simulated results.

Nuclear DNA content variation of three Miscanthus species in China

Xi Li,Die Hu,Manman Luo,Ming Zhu,Xinwei Li,Fan Luo,Jianqiang Li,Juan Yan 한국유전학회 2013 Genes & Genomics Vol.35 No.1

In order to estimate the variation in nuclear genome size in Miscanthus, flow cytometry of nuclei stained by propidium iodide was carried out using 36 populations of three Miscanthus species: M. lutarioriparius, M. sacchariflorus and M. sinensis, which were sampled from cold northern to warm and humid southern and central China, as well as near the sea level in eastern China to mountains in western China. The DNA content of diploid was 4.37 ±0.02 pg/2C in M. lutarioriparius, 4.37 ± 0.01 pg/2C in M. sacchariflorus, and 5.37 ± 0.03 pg/2C in M. sinensis,respectively. There was no intraspecific variation in the three Miscanthus species at the diploid level, suggesting that the genome size was stable within species and the diverse environments did not induce variation in genome size at the diploid level. However, tetraploid populations were found in M. lutarioriparius and M. sacchariflorus, and their genome sizes were 8.56 and 8.54 pg, respectively, which are lower than expected values (8.74 pg), indicating the genome downsizing after polyploidization in the genus. Our results showed that the plant height of M. lutarioriparius was the highest one among the three species and the species was more closely related to M. sacchariflorus than M. sinensis. The intra-species genomic variation and inter-species differentiation in Miscanthus species provide important genetic and genomic information for the development of Miscanthus,especially for the endemic species, M. lutarioriparius,(together with Miscanthus 9 giganteus) which are now emerging as a key bio-energy crop because of their high yields and strong adaptability.

Dark Soliton Solution of the Three-dimensional Gross-Pitaevskii Equation with an Isotropic Harmonic Potential and Nonlinearity in Polytropic Approximation

Xinwei Fan,Yu Zhou,Yalun Li,Ying Wang,Shuyu Zhou 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.3

We study the three-dimensional Fermi gas in an isotropic harmonic trap during the Bardeen- Cooper-Schrieffer superfluid to Bose-Einstein condensate (BCS-BEC) crossover, which is modeled by using the generalized Gross-Pitaevskii equation (GGPE) in the polytropic approximation. We analytically solved the 3D GGPE with a coupled modulus-phase transformation without introducing any additional integrability constraint, reaching the dark soliton-like solution. We find that the dark soliton identified undergoes an oscillation with a constant period over the whole BCS-BEC crossover region, although the amplitude of the dark soliton varies with polytropic index, demonstrating the peculiar nonlinear properties for the system modeled by using the 3D GGPE.

Test Analysis and Study on Cutting Destruction Properties of Solid Ice-snow Road

Li Yaqin,WuWenfu,Wang Junfa,Qiu Xinwei 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5

Build cutting resistance measurement system based on single-chip microcomputer and high speed camera in order to analysis cutting destruction of solid ice-snow. The experimental model has been built according to the rotating orthogonal experiment methods when tests, take the cutting resistance as objective function, A significant factor in the depth of cutting, rake angle as well as tool installation angle as influencing factors, and analysis found that the relationship between the primary and secondary factors were setting angle>density>cutting depth. By comparing theoretical models and experimental models found both the maximum error is about 8.7%, the minimum error is about 12.8%, the median error of about 12%, which verified the availability of theoretical model. Affecting the snow removal efficiency of parameters were carried out the optimal tests study, and found that the best setting angle of cutting tool is from 46°to 52°on the condition that the temperature is lower than -15°C, the thickness of snow and ice is less than 35mm, and rake angle -10°~ -9°.Optimal combination of parameters meet not only the job requirements but also provide a valuable reference for the optimum design of snow removal tool structure and process parameters, and the overall design of a prototype in the future.

Serum microRNA-381: A Potential Marker for Early Diagnosis of Gastric Cancer

Ye Li,Huihui Sun,Jie Guan,Tingting Ji,Xinwei Wang 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.8

Purpose: The purpose of this study was to explore the potential early diagnostic value of serum microRNA-381(miRNA-381) inpatients with gastric cancer (GC). Materials and Methods: Patients with advanced gastric cancer (AGC) and early gastric cancer (EGC), as well as healthy individuals,were enrolled in this study. Expression of miRNA-381 in serum was detected using real-time quantitative PCR. Electrochemiluminescenceanalysis was used to investigate the expression of classic tumor markers, including carbohydrate antigen (CA) 199,CA724, and carcinoembryonic antigen. Finally, receiver operating characteristic curve and Kaplan-Meier analysis were used todetermine the value of miRNA-381 in clinical diagnosis of GC. Results: miRNA-381 was differentially expressed among the study groups. AUC analysis showed that the sensitivity and specificityof serum miRNA-381 in the diagnosis of GC were superior to those of other tumor markers. Furthermore, low levels of miRNA-381 expression were positively correlated with lymph node metastasis and AGC. Finally, Kaplan-Meier survival analysisshowed that down-regulation of miRNA-381 was associated with lymph node metastasis and the development of GC. Conclusion: miRNA381, which was down-regulated in GC, might be a novel early diagnosis marker for patients with GC.

Efficiency of Cytokine-Induced Killer Cells in Combination with Chemotherapy for Triple-Negative Breast Cancer

Man Li,Yang Wang,Feng Wei,Xiumei An,Naining Zhang,Shui Cao,Baozhu Ren,Xinwei Zhang,Xiubao Ren 한국유방암학회 2018 Journal of breast cancer Vol.21 No.2

Purpose: The treatment of triple-negative breast cancer (TNBC) remains challenging, due to the absence of estrogen, progesterone, and human epidermal growth factor receptors. This study was designed to evaluate the efficiency and safety of cytokineinduced killer (CIK) cell immunotherapy, following regular chemotherapy, for patients with TNBC. Methods: A total of 340 patients with postmastectomy TNBC, from January 1, 2010 to June 30, 2014, were included in this retrospective study. Seventy-seven patients received CIK cell immunotherapy, following regular chemotherapy (arm 1), and 263 patients received regular chemotherapy alone (arm 2). The primary aim was overall survival (OS) and disease-free survival (DFS), and the treatment responses and adverse events were also evaluated. Results: The 5-year DFS and OS rates in arm 1 were 77.9% and 94.3%, compared with 69.8% and 85.6% in arm 2, respectively (p=0.159 and p=0.035, respectively). This clearly shows that there was no statistical difference in the 5-year DFS between the two groups. Multivariate analyses of arm 1 indicated that a Karnofsky performance score (KPS) ≥90 and stage I/IIA disease were significantly associated with a prolonged DFS period (hazard ratio [HR], 0.25; 95% confidence interval [CI], 0.09–0.74; p=0.012; and HR 0.21; 95% CI, 0.06–0.82; p=0.024, respectively), but a KPS ≥90 and stage I/IIA disease were not independent prognostic factors for OS. Toxicity was mild in patients who received the CIK therapy. Conclusion: The data suggested that CIK cell immunotherapy improved the efficiency of regular chemotherapy in patients with TNBC, and the side effects of CIK cell immunotherapy were mild.

Research on Human Driving Characterised Trajectory Planning and Trajectory Tracking Control Based on a Test Track

Xing Xu,Xinwei Jiang,Ju Xie,Feng Wang,Minglei Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.4

The trajectory planning plays an important role in realizing the autonomous driving process. The trajectory that reflects the driving habits of human drivers and conforms with people’s driving intuition enables a vehicle to operate smoother and more comfortable when passing through corners, which could improve the acceptability of autonomous vehicles in the market in the future. The research of this paper focuses on planning a human driving characterised trajectory along a road based on the test track that could reflect natural driving behaviour in corners considering the sense of natural and comfortable for the occupants. Firstly, the data collected of the test track are processed and the coordinate system transformation is completed, and the human tested trajectories in the test track is extracted and analysed. Then, the human driving characterised trajectory planning is completed based on optimal control in a lane section on the test track. The trajectory tracking control algorithm based on LQR is designed, and a CarSim/Simulink co-simulation platform is established to track the optimal trajectory generated in a lane and the lane centreline trajectory to verify the superiority of the planned trajectory. The results show that compared with the centreline trajectory, the human driving characterised trajectory planned enables the autonomous vehicle operates smoother and more comfortable, and reflects the characteristic of human drivers to a large extent.

Wideband Lamb wave analysis based on continuous wavelet transform

Lihua Shi,Xinwei Wang,Gang Li,Lingyan Zhang 국제구조공학회 2005 Smart Structures and Systems, An International Jou Vol.1 No.3

In Lamb wave detection of damages in smart structures, the excitation pulse is usually designed as a narrow band burst wave for the convenience of analysis and recognition. However, the wideband excitation can excite more modes in plate/shell structure and thus provides extra information for changes of the structure. This paper presents a method that can extract information in wideband Lamb wave signals. By transforming the detected signals into various sub-frequency band, the measured signal can be converted to its equivalences of narrow band excitations, therefore, the information in different frequency bands can be acquired from a single test and in the same time the complicity of wideband signal can be simplified. Some test results are provided to verify this method.

Adaptive Frequency-Regualtion Strategy of a DFIG for Enhancing Frequency Support Capability

Mingyi Sun,Xinwei Li,Dejian Yang,Gangui Yan,Lin Yue,Xin Wang 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

Nodule Rich Protein 2 modulates nodule number in Medicago truncatula

Junhui Yan,Xinwei Yang,Yawen Wang,Liangliang Yu,Li Luo 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.1

Symbiotic nitrogen fxation is beneft to sustainable agriculture and global nitrogen cycle. Many small peptides were identifed as regulators involving in the interaction between rhizobia and legume. Here we reported Nodule Rich Protein 2 (MtNRP2) encoding a small peptide in Medicago truncatula, belonged to a group of nodule rich protein restricted in legume species. MtNRP2 expressed highly in root nodule and its promoter was active during the initiation and development of root nodule and lateral root. To investigate the function of MtNRP2 in nodulation, we generated MtNRP2-overexpression and MtNRP2- knockdown transgenic Medicago. MtNRP2-overexpression transgenic lines performed normal nodulation phenotype compared with vector control. However, in the MtNRP2-RNAi transgenic plants, the decrease of MtNRP2 expression lead to the increase of infection threads number (7 day post inoculation) and nodules number (3 week post inoculation); meanwhile, the expression of MtRGF3 and MtPUB1 was inhibited. These results suggested that MtNRP2 negatively regulated nodulation in Medicago truncatula.