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Search Results: 1 - 10 of 143180 matches for " CHEN Wei-Feng "
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Group Ranking Sequence Decision for Recommendation of Messaging APP  [PDF]
Wei-Feng Tung
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.27002

This research is to develop a novel recommendation service using a unique group ranking sequence technique “Mining Maximum Consensus Sequences from all Users’ Partial Ranking Lists (MCSP)”. MCSP is capable of determining the product’s sequence recommendations based on k-item candidate sequences and maximum consensus sequences. This paper also illustrates the complete decision procedures of group ranking sequences. In terms of popular information products, we select “messaging app” to reveal the MCSP’s group ranking sequence decision. The recommendation service provides that query users search for the product’s recommendation (i.e., messaging app) according to the preference sequences from query users themselves and a great deal of preference sequences from the other users. This paper consists of the definitions, procedures, implementation, and experiment analysis, as well as system demonstrations of MCSP respectively. This research contributes to a kind of systematic service innovation.

Quasiparticle scattering in two dimensional helical liquid
Xiaoting Zhou,Chen Fang,Wei-Feng Tsai,Jiangping Hu
Physics , 2009, DOI: 10.1103/PhysRevB.80.245317
Abstract: We study the quasiparticle interference (QPI) patterns caused by scattering off nonmagnetic, magnetic point impurities, and edge impurities, separately, in a two dimensional helical liquid, which describes the surface states of a topological insulator. The unique features associated with hexagonal warping effects are identified in the QPI patterns of charge density with nonmagnetic impurities and spin density with magnetic impurities. The symmetry properties of the QPI patterns can be used to determine the symmetry of microscopic models. The Friedel oscillation is calculated for edge impurities and the decay of the oscillation is not universal, strongly depending on Fermi energy. Some discrepancies between our theoretical results and current experimental observations are discussed.
Interaction-driven topological and nematic phases on the Lieb lattice
Wei-Feng Tsai,Chen Fang,Hong Yao,JiangPing Hu
Physics , 2011,
Abstract: We show that topological states are often developed in two dimensional semimetals with quadratic band crossing points (BCPs) by electron-electron interactions. To illustrate this, we construct a concrete model with the BCP on an extended Lieb lattice and investigate the interaction-driven topological instabilities. We find that the BCP is marginally unstable against infinitesimal repulsions. Depending on the interaction strengths, topological quantum anomalous/spin Hall, charge nematic, and nematic-spin-nematic phases, develop separately. Possible physical realizations of quadratic BCPs are provided.
Research on the Mobile Electronic Delivery Platform for Iron and Steel Sales Logistics Based on 3G Netbook  [PDF]
Wei-Feng Zhu, Jian-Hua Gu, Li Ye, Zhi-Xin Shi, Shu-Rong Mei, Qiao Chen, Jian-Jun Hu
iBusiness (IB) , 2012, DOI: 10.4236/ib.2012.43035
Abstract: According to the situation of sales logistics transportation management in an iron and steel enterprise and the possible logistics risks, the architecture of mobile electronic delivery platform for iron and steel sales logistics based on 3G netbook is proposed. The delivery process based on 3G netbook is analyzed. The three-tier C/S-based platform framework is also proposed, including database server, application server and clients. The function design of the platform is given. Finally, the key technologies of the platform are discussed.
Prenatal Organophosphates Exposure Alternates the Cleavage Plane Orientation of Apical Neural Progenitor in Developing Neocortex
Xiao-Ping Chen, Wei-Feng Chen, Da-Wei Wang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095343
Abstract: Prenatal organophosphate exposure elicits long-term brain cytoarchitecture and cognitive function impairments, but the mechanism underlying the onset and development of neural progenitors remain largely unclear. Using precise positioned brain slices, we observed an alternated cleavage plane bias that emerged in the mitotic neural progenitors of embryonal neocortex with diazinion (DZN) and chlorpyrifos (CPF) pretreatment. In comparison with the control, DZN and CPF treatment induced decrease of vertical orientation, increase of oblique orientation, and increase of horizontal orientation. That is, the cleavage plane orientation bias had been rotated from vertical to horizontal after DZN and CPF treatment. Meanwhile, general morphology and mitotic index of the progenitors were unchanged. Acephate (ACP), another common organophosphate, had no significant effects on the cleavage plane orientation, cell morphology and mitotic index. These results represent direct evidence for the toxicity mechanism in onset multiplication of neural progenitors.
Predicting the growth rate of helium bubbles in metal tritide
Fan-Xin Meng,Chen Ming,Xi Chen,Wei-Feng Yu,Xi-Jing Ning
Physics , 2013,
Abstract: Helium bubbles nucleation and growth in metals or metal tritide is a long-standing problem attracting considerable attention in nuclear industry but the mechanism remains indistinct and predicting the growth rate of helium bubble is inexistence still up to new. Here, the rate of helium bubbles nucleation and growth in metal tritide is developed based on a dynamical model, which describes the diameter of helium bubbles increasing linearly as t**(1/3) in titanium tritide at room temperature, agreeing quite well with the experimental phenomenon. The way of reducing storage temperature from 300 to 225 K or increasing the helium atoms diffusion barrier from 0.81 to 1.1 eV can effectively restrain bubbles growth and prolong lifetime of titanium tritide more than 4 times, which provides a useful reference to relevant experiment exploration and applications. This model also can be used to predict lifetime of new tritium-storage materials and plasma facing materials in nuclear industry.
Stress responses of Canna indica to Cd and its accumulation of Cd

ZHANG Cheng-Xiang,CHEN Wei-Feng,

植物生态学报 , 2012,
Abstract: Aims The valuable ornamental plant Canna indica is widely distributed in city gardens and on roadsides in China. Our objective was to study the stress responses of C. indica to cadmium (Cd) and its accumulation of Cd. Methods With pot culture experiments, C. indica was cultured with different Cd concentrations. Morphological, ecological, physiological indexes were observed during the growth of C. indica. The distribution of Cd in C. indica plants was determined after harvest. Important findings The Cd treatment of <1 mg·kg–1 had no obvious effect on growth of C. indica; however, Cd concentration of >5 mg·kg–1 inhibited growth. The flowering period was prolonged with <5 mg·kg–1 Cd concentration. With increasing Cd concentration, root activity, chlorophyll and water content all decreased, soluble sugar content initially increased and then decreased, and free proline content and permeability of cell membrane increased gradually. The distribution of Cd in C. indica was root > shoot. With increasing Cd concentration of the medium, Cd concentration in shoots and roots increased; however, the accumulator and translocation factors decreased gradually. The maximum accumulation of Cd in C. indica was 5.89 mg·plant–1 with the treatment of 20 mg·kg–1 . It is concluded that C. indica is suitable for landscaping use when the Cd concentration in soil is <1 mg·kg–1 .
Endoscopic submucosal dissection for foregut neuroendocrine tumors: An initial study
Quan-Lin Li,Yi-Qun Zhang,Wei-Feng Chen,Mei-Dong Xu
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i40.5799
Abstract: AIM: To evaluate the feasibility and efficacy of endoscopic submucosal dissection (ESD) for foregut neuroendocrine tumors (NETs). METHODS: From April 2008 to December 2010, patients with confirmed histological diagnosis of foregut NETs were included. None had regional lymph node enlargement or distant metastases to the liver or lung on preoperative computerized tomography scanning or endoscopic ultrasonography (EUS). ESD was attempted under general anesthesia. After making several marking dots around the lesion, a mixture solution was injected into the submucosa. The mucosa was incised outside the marking dots. Dissection of the submucosal layer beneath the tumor was performed under direct vision to achieve complete en bloc resection of the specimen. Tumor features, clinicopathological characteristics, complete resection rate, and complications were evaluated. Foregut NETs were graded as G1, G2, or G3 on the basis of proliferative activity by mitotic count or Ki-67 index. All patients underwent regular follow-up to evaluate for any local recurrence or distant metastasis. RESULTS: Those treated by ESD included 24 patients with 29 foregut NETs. The locations of the 29 lesions are as follows: esophagus (n = 1), cardia (n = 1), stomach (n = 23), and duodenal bulb (n = 4). All lesions were found incidentally during routine upper gastrointestinal endoscopy for other indications, and none had symptoms of carcinoid syndrome. Preoperative EUS showed that all tumors were confined to the submucosa. Among the 24 gastric lesions, 16 lesions in 11 patients were type I gastric NETs arising in chronic atrophic gastritis with hypergastrinemia, while the other 8 solitary lesions were type III because of absence of atrophic gastritis in these cases. All of the tumors were removed in an en bloc fashion. The average maximum diameter of the lesions was 9.4 mm (range: 2-30 mm), and the procedure time was 20.3 min (range: 10-45 min). According to the World Health Organization 2010 classification, histological evaluation determined that 26 lesions were NET-G1, 2 gastric lesions were NET-G2, and 1 esophageal lesion was neuroendocrine carcinoma (NEC). Complete resection was achieved in 28 lesions (28/29, 96.6%), and all of them were confined to the submucosa in histopathologic assessment with no lymphovascular invasion. The remaining patient with NEC underwent additional surgery because the resected specimens revealed angiolymphatic and muscularis invasion, as well as incomplete resection. Delayed bleeding occurred in 1 case 3 d after ESD, which was managed by endoscopic treatmen
Hand-assisted Laparoscopic Splenectomy - Preliminary Experience in Southern Taiwan
Wei-Feng Lee,Shih-Chung Wu,Chee-Chien Yong,Chao-Long Chen
Chang Gung Medical Journal , 2010,
Abstract: Background: A hand-assisted laparoscopic procedure allows the surgeon to insert the nondominanthand into the abdomen, and helps to recover the tactile sensation.For a massively enlarged spleen, this technique overcomes difficulty in conventionallaparoscopic splenectomy. The advantages of minimally-invasivesurgery can still be preserved. We describe our preliminary experience inhand-assisted laparoscopic splenectomy.Methods: The data of 5 patients who presented with splenomegaly and underwenthand-assisted laparoscopic splenectomy between April 2000 and January2004 were reviewed retrospectively for analysis.Results: The mean age was 45.4
Theory of Electron Nematic Order in LaOFeAs
Chen Fang,Hong Yao,Wei-Feng Tsai,JiangPing Hu,Steven A. Kivelson
Physics , 2008, DOI: 10.1103/PhysRevB.77.224509
Abstract: We study a spin $S$ quantum Heisenberg model on the Fe lattice of the rare-earth oxypnictide superconductors. Using both large $S$ and large $N$ methods, we show that this model exhibits a sequence of two phase transitions: from a high temperature symmetric phase to a narrow region of intermediate ``nematic'' phase, and then to a low temperature spin ordered phase. Identifying phases by their broken symmetries, these phases correspond precisely to the sequence of structural (tetragonal to monoclinic) and magnetic transitions that have been recently revealed in neutron scattering studies of LaOFeAs. The structural transition can thus be identified with the existence of incipient (``fluctuating'') magnetic order.
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