Real-Time Repairable Interpolation Scheme for CNC Tool Path Processing

Wei Fan,Chen-Han Lee,Ji-Hong Chen 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.12

G01 trajectory is widely-adopted for CNC machining. The piecewise linear trajectory is geometrically discontinuous, bringing about drastic fluctuation of feedrate and acceleration, and causing low machining efficiency and quality. Many methods of trajectory smoothing are developed and applied in CNC system. However some shortcomings exist when these methods were applied in CNC machining. In the existing methods, the following requirements are not satisfied simultaneously: not less than G2 continuity, confined chord error, shape preservation, interpolating G01 points, spatial applicability, real-time performance of algorithm, free geometric form. Considering various requirements of CNC machining, this work develops an interpolation scheme with local repairing function to deal with the possible shape deficiencies of trajectory. The resulting tool path has G2 continuity and is optimized in bending energy under shape-preserving and chord error constraints. Combining with jerk-limited feedrate scheduling, a real-time tool path processing strategy is developed. The simulation demonstrates the proposed method eliminates shape deficiencies, and has apparent advantage in the reduction of contour error, curvature, bending energy and machining time, compared with Zhao’s and Fan’s methods. The experiment demonstrates the advantages of the proposed algorithm in improving the quality of machined surface and machining efficiency, compared with previous methods.

Experimental Studies on Progressive Collapse Behavior of RC Frame Structures: Advances and Future Needs

Wei?Jian Yi,Fan Yi,Yun Zhou 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.4

In the recent two decades, the progressive collapse of reinforced concrete (RC) frame structures attracted unprecedented research interests in the structural engineering community. Experiments are regarded as an essential method in this field since actual cases can barely provide sufficient and effective data to support rigorous research. In this paper, prevailing experimental assumptions and configurations among over 100 series of experiments are quantitatively revealed by a bibliometric collection based on systematic search in an academic database. Since numerous experiments have been reported on the progressive collapse of RC frame structures, this paper subsequently presents a state-of-the-art review summarizing both experimental consensuses and controversies constituted by three main aspects: (a) static mechanisms, (b) dynamic behavior, and (c) threat-dependent research. The significance of secondary mechanisms, existing problems of dynamic effects, and potential flaws of the threat-independent assumption are discussed in detail with experimental findings. Future needs are emphasized on research targets, correlations between experiments and design, dynamic effects, threat-dependent issues, and retrofitting. These recommendations might help researchers or designers realize a more reliable and realistic progressive collapse design of RC frame structures in the future.

Bioinformatics Analysis Reveals Connection of Squamous Cell Carcinoma and Adenocarcinoma of the Lung

Fan, Wei-Dong,Zhang, Xian-Quan,Guo, Hui-Lin,Zeng, Wei-Wei,Zhang, Ni,Wan, Qian-Qian,Xie, Wen-Yao,Cao, Jin,Xu, Chang-Hua Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4

Squamous cell carcinoma and adenocarcinoma are the major histological types of non-small cell lung cancer. Because they differ on the basis of histopathological and clinical characteristics and their relationship with smoking, their etiologies may be different; for example, different tumor suppressor genes may be related to the genesis of each type. We used microarray data to construct three regulatory networks to identify potential genes related to lung adenocarcinoma and squamous cell carcinoma and investigated the similarity and specificity of them. In the network, some of the observed transcription factors and target genes had been previously proven to be related to lung adenocarcinoma and squamous cell carcinoma. We also found some new transcription factors and target genes related to SCC. The results demonstrated that regulatory network analysis is useful in connection analysis between lung adenocarcinoma and squamous cell carcinoma.

Root Architecture of Apple Trees under Different Soil Conditions

Wei-Guo Fan,Hong-Qiang Yang 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Effect of Cu on Pore Structure of Al–Si Foam

Fan Deng,Jianzhong Fan,Yanqiang Liu,Xuehan Lu,Shaohua Wei,Junhui Nie 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

The alloy composition is an important factor effecting the pore structure of aluminum foam. In this paper, the powder compactfoaming method was used, and different content of Cu element powders were added to the alloy Al–9Si, for investigatingthe effect of alloying element on foaming process. With the Cu content of Al–Si–Cu alloy increasing, the expansion ratio isincreased, the time required to reach maximum expansion is shortened, and the number of fissure-like pores at early foamingstage is decreased. This improving action is related to the higher volume fraction of liquid phase in same melting temperaturecaused by increasing Cu content in alloy. Comparing different Al–Si–Cu alloys with different Cu content at same expansionratio, the higher Cu content, the smaller pore size and the thinner cell wall. This beneficial effect on pore structure is attributedto the addition of Cu that is benefit to increasing the viscosity of Al–Si–Cu alloy during foaming. And at same expansionrate, the more content of Cu in Al–Si–Cu alloy, the higher compressive strength of aluminum foam.

Short-term effects of returning granulated straw on soil microbial community and organic carbon fractions in dryland farming

Fan Wei,Wu Jinggui 한국미생물학회 2020 The journal of microbiology Vol.58 No.8

We conducted a 2-year field experiment which was comprised of five treatments, namely no straw returning (CK), straw mulching (SM), straw plowed into the soil (SP), and straw returned in granulated form (SG). The aim of this study was to investigate the effects of different straw returning modes on soil bacterial and fungal community structure and their relationships to soil organic carbon (SOC) fractions at three different soil depths (0–20, 20–40, and 40–60 cm) in a dryland under maize cultivation in Northeast (NE) China. SM, SP, and SG treatments significantly increased SOC content. Compared with SM and SP treatments, SG treatment significantly increased the content of SOC and easily oxidizable carbon (EOC) in the topsoil (0–20 cm depth), and increased dissolved organic carbon (DOC) and SOC content of the light fraction (LFOC) in the 20–40 cm layer. Meanwhile, SG treatment exhibited the highest microbial biomass C (MBC) content in all of the three soil depths. SG treatment also enhanced bacterial richness as well as fungal richness and diversity in the upper 40 cm of soil. In addition, SG treatment increased the relative abundance of Proteobacteria in all depths, and had the highest relative abundance of Basidiomycota in the first 20 cm of soil. SP treatment showed the lowest soil organic carbon content in all fractions and soil microbial community composition. SM treatment exhibited similar results to SG treatment in SOC, DOC, and LFOC contents, and bacterial diversity in the topsoil and subsoil. As a whole, treatment SG improved soil quality and maize yield, hence we recommend returning granulated straw as the most effective practice for enhancing labile SOC fractions as well as maintaining soil diversity and microbial richness of arid farmlands in NE China.

De novo assembly and transcriptome analysis of differentially expressed genes relevant to variegation in hawthorn flowers

Wei Ji,Wei Zhao,Rong‑Chen Liu,Xiao‑Bo Jiao,Kai Han,Zhong‑Yi Yang,Mei‑Ying Gao,Rui Ren,Xiu‑Juan Fan,Ming‑Xia Yang 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.6

Flower color variegation has been observed in many plant species. However, pink flowers on the white-blooming hawthorn trees found by our group earlier have never been reported. To better understand the differentially expressed genes (DEGs) in variegated hawthorn flowers, white and pink flowers at different developmental stages (S1 and S2) underwent transcriptome sequencing separately. Approximately 34.28 Gb of high-quality data were obtained and assembled into 100,013 unigenes with an average length of 706.93 bp. These unigenes were further subjected to functional annotation and biochemical pathway analysis, and DEGs of two types of hawthorn flowers at different developmental stages were studied. Based on the enrichment analysis of DEGs, eight anthocyanin-modified enzyme genes or other enzyme genes that indirectly affect anthocyanin synthesis (5AT, 3GGT , and AI, β-Glu, two Aux/IAAs, two PODs), eight structural genes (UFGT, DFR, CHI, two F3Hs, and three PALs), and three transcription factors (one MYB and two bHLHs) were also identified. We randomly selected 15 genes, and the trends in the expression levels of these genes in the organs of white and pink flowers at different developmental stages were verified by quantitative real-time PCR. Mass sequence data obtained by RNA-seq of variegated hawthorn flowers provided basic sequence information and a unique opportunity to uncover the genetic mechanisms under-lying flower color variegation.

A PROSPECT TO THE DEVELOPMENT OF MYCOLOGY IN CHINA

( Wei Fan Chiu ) 한국균학회 1995 95 SECOND JOINT SEIMINAR Vol.- No.-

량후고촌 (良户古村) 창턱 돌(窗台石) 문양구성 연구

( Fan Wei ),( Nam Ho Jung ) 한국상품문화디자인학회(구 한국패키지디자인학회) 2021 상품문화디자인학연구 Vol.65 No.-

Window stones is mainly distributed in the residential buildings in the southeast area of Shanxi, which benefits from the geographical, economic and cultural characteristics of the region in history. The window stone decoration in Lianghu has a wide range of themes, rich in content and relatively close to life. The content of the pattern is mainly the plants, flowers and birds, auspicious birds and animals, and the theme of the expression is mostly the meaning of good luck and good fortune. Some are to show the ambition of the owner of the house, the yearning for a better life, the warning and the enlightenment of the later generations. There are many ways of expression, such as metaphor, symbol, homophonic, etc. The form and content are skillfully combined, which is full of interest. Window stones in Lianghu often appear in pairs, although a pair of windowsill stone in the theme, composition, edging and other aspects similar, the central pattern is not exactly the same, and the meaning of the expression of nature is not the same.The two complement each other and set each other off, constitute the village of Lianghu complex and unique charm of the windowsill decoration art.

A template-hatched method towards poly(acrylic acid) hydrogel spheres with ultrahigh ion exchange capacity and robust adsorption of environmental toxins

Fan Yang,Xin Fan,Man Zhang,Chen Wang,Wei-Feng Zhao,Chang-Sheng Zhao 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-

Polyacrylic acid/polyethersulfone (PAA/PES) capsules were adopted as templates to synthesize PAA/PES core–shell spheres, and the PES shell of spheres could be removed automatically by the swelling nature of the cross-linked PAA hydrogel core. By using the method, PAA hydrogel spheres were prepared with an ultrahigh ion exchange capacity of 12 meq g−1, and the spheres showed a high adsorption capacity for methylene blue. The PAA-polyacrylamide hydrogel spheres with dual adsorption ability and good mechanical property were also prepared. It was revealed that these two hydrogel spheres can be effectively utilized in the removal of environmental toxins.