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Establishing reliable correspondences plays a vital role in many feature-matching based computer vision tasks. Given putative correspondences of feature points in two images, in this paper, we propose a novel network for inferring the probabilities of correspondences being inliers or outliers and regressing the relative pose encoded by the essential matrix. Previous research proposed an end-to-end permutation-equivariant classification network based on multi-layer perceptrons and context normalization. However, the context normalization treats each correspondence equally and ignore the extraction of channel information, as a result the representation capability of potential inliers can be reduced. To solve this problem, we apply attention mechanism in our network to capture complex information of the feature maps. Specifically, we introduce two types of attention blocks. We adopt the spatial attention block to capture complex spatial contextual information, and the rich channel information can be obtained by utilizing the channel attention block. To obtain richer contextual information and feature maps with stronger representative capacity, We combine these attention blocks with the PointCN block to form a new network with strong representative ability. Experimental results on several benchmark datasets show that the performance on outlier removal and camera pose estimation is significantly improved over the state-of-the-arts.

This study compared the clinicopathological characteristics and survival of patients with metastatic renal cell carcinoma (mRCC) stratified by age to identify clinical features and prognostic factors. Patients with renal cell carcinoma (RCC) between 2010 and 2015 were identified from the Surveillance, Epidemiology and End Results database. Age was an independent prognostic factor for patients with RCC, mRCC, mRCC of clear cell renal cell carcinoma and lung-related metastases. There were many significant differences between the younger and older groups, including differences in marital status, race, sex, year of diagnosis, histology grade, laterality, T stage, N stage, tumor size, type of treatment, including surgery, radiation or chemotherapy, and pattern of organic metastasis to the liver, lung, or brain (P

Angiotensin II (Ang-II)-induced fibroblast differentiation plays an important role in the development of atrial fibrosis and atrial fibrillation (AF). Here, we show that the expression of the histone methyltransferase enhancer of zeste homolog 2 (EZH2) is increased in atrial muscle and atrial fibroblasts in patients with AF, accompanied by significant atrial fibrosis and atrial fibroblast differentiation. In addition, EZH2 is induced in murine models of atrial fibrosis. Furthermore, either pharmacological GSK126 inhibition or molecular silencing of EZH2 can inhibit the differentiation of atrial fibroblasts and the ability to produce ECM induced by Ang-II. Simultaneously, inhibition of EZH2 can block the Ang-II-induced migration of atrial fibroblasts. We found that EZH2 promotes fibroblast differentiation mainly through the Smad signaling pathway and can form a transcription complex with Smad2 to bind to the promoter region of the ACTA2 gene. Finally, our in vivo experiments demonstrated that the EZH2 inhibitor GSK126 significantly inhibited Ang-II-induced atrial enlargement and fibrosis and reduced AF vulnerability. Our results demonstrate that targeting EZH2 or EZH2-regulated genes might present therapeutic potential in AF.

Three-dimensional user interfaces (3D UI) allow users to interact with virtual objects, environments, or information on the physical or virtual space. With the development of virtual reality technology, Tons of VR products tend to occupy the market quickly. However, the formulation of interface design specifications and the enhancement of user experience always be ignored. More than one-third of the users interrupted their experience during the market research because they did not understand the program operation. 3D UI is fundamental to Interactive in virtual space. Thus, this article introduces the basic overview of virtual reality, focusing on analyzing the main design differences between traditional and three-dimensional interfaces. This study's specific objective was to propose three-dimensional interface construction strategies mainly include: 1) Building a natural harmonious interaction relationship between man and machine; 2) Driving interface experience optimization through mental models. In particular, this research tries to establish the Paradigm of Theoretical Research of 3D user interface, which provides theoretical support for design in the future.

This paper presents a semi-supervised learning method that incorporates sense knowledge into a Chinese word sense disambiguation (WSD) model. This research also effectively exploits HowNet-based semantic relatedness in order to leverage system performance. The proposed method includes Sense Colony task for improving context expansion and semantic relatedness calculating for sense feature representation. To incorporate sense knowledge into WSD, this paper employs the Semantic relatedness in a semi-supervised label propagation classifier. This research demonstrates state-of-the-art results on word sense disambiguation tasks.

In this letter, a single-layer frequency selective surface (FSS) with high angular stability is proposed. By combining two modified cross loops, the proposed combined FSS (CFSS) element is obtained. Due to the rotationally symmetrical structure, the CFSS is insensitive to the TE or TM polarizations incidence. By the combination, the angular stability property is achieved that the maximum resonant frequency deviation is 0.08 GHz when the incident angle ranges from 0° to 85°. The mechanism of the CFSS is studied by both the equivalent circuit model and numerical analysis. A prototype is manufactured and measured in an anechoic chamber to verify the theoretical analysis. The simulated and measured results have good agreements, and all the performances are proved.

Positioned as an international metropolis, how to improve residents’ intentions to separate MSW (Municipal Solid Waste) is a very urgent issue for Beijing to be sustainable since MSW separation is regarded as an effective way to reduce MSW and thus protect the environment. In this research the different kinds of residents’ intentions to separate MSW were researched and the extended VBN theory with green trust is used to explain them. We divided the intentions into three levels, namely conscious intentions, promise-based intentions and action-based intentions, which are designed to understand how important is MSW separated collection to increase the residents’ MSW separation intentions and at what level of trust they have toward the MSW collection companies, including both public and private MSW collection companies. A survey covering the intentions and all the necessary items for building the extended VBN models was designed. Total 341 valid questionnaires were collected and after doing all the necessary analysis we found there are a group of residents indicate they will separate the MSW consciously and a promised MSW separate collection program can obviously increase the residents’ intentions to separate MSW, many of them trust the MSW collection companies’ promises and they don’t need the real actions to verify. Although residents prefer to trust the public MSW collection companies than the private companies, the difference is not very obvious. The full extended VBN theory can only successfully explain the residents’ conscious intentions to separate MSW which means residents have higher Bio value are more likely to separate MSW consciously. For the promise-based intentions and action-based intentions, only parts of the extended VBN theory can explain them, and the effect size is not very big, there are other factors play a much bigger role.

In this paper, the mathematical lifetime models of capacitors and spark switches are investigated and a linear transformer driver circuit model consisting of five 100 kV/MA cavities is built. The effect of random failures, switch jitter and prefire probability, on the module lifetime is investigated, respectively, by observing the influence on the capacitor lifetime and module output. Sensitivity analysis of time delay jitter of switches and prefire probability of switches on the module lifetime is carried out. The module lifetime prediction model is built by the combination of the lifetime model of key components, random failure model, and the module circuit model. Examples are taken to illustrate the process of module lifetime prediction and maintenance cycle determination.

Transcatheter aortic valve implantation (TAVI) is an established treatment for high surgical risk aortic stenosis patients; in recent years, it has also been used in patients with pure/dominant aortic regurgitation (AR). This study aimed to determine the impact of transapical TAVI on left ventricle myocardial mechanics in AR patients. Thirty AR patients (70% men; mean age, 72.8 ± 4.3 years) were enrolled. Conventional echocardiography was performed on all patients before and 12 months after TAVI. Three-dimensional speckle tracking was accomplished in 20 AR patients for the evaluation of global longitudinal strain, global circumferential strain, twist, torsion, apical rotation and basal rotation. Preoperative left ventricular ejection fraction (LVEF), global longitudinal strain (GLS), global circumferential strain (GCS), twist, torsion and apical rotation were impaired in AR patients compared with controls. Mean left ventricular (LV) end-diastolic diameter (from 62.9 ± 7.3 to 52.0 ± 6.8 mm, p

Polarization conversion metasurface (PCM) with wide operating band and high polarization conversion ratio is proposed for antenna radar cross-section (RCS) reduction. A 3rd-order quadrate fractal structure (QFS) is designed as the PCM element that the polarization conversion ratio is greater than 80% from 10.45 GHz to 32.15 GHz (relative bandwidth of 101.9%). The PCM is applied in the RCS reduction of microstrip antennas by chessboard-like arrangement on the antenna. The performances of the proposed PCM and antenna are studied by measurement and simulation. The results show that, with the radiation performance hold, the monostatic RCS of the proposed antenna is obviously reduced from 8 GHz to 28 GHz which completely covers the operating band of the antenna.

Hepatitis B virus infection is a non-cytopathic hepatotropic virus which can lead to chronic liver disease and hepatocellular carcinoma. Traditional therapies fail to provide sustained control of viral replication and liver damage in most patients. As an alternative strategy, immunotherapeutic approaches have shown promising efficacy in the treatment of chronic hepatitis B patients. Here, we investigated the efficacy of a novel therapeutic vaccine formulation consisting of two HBV antigens, HBsAg and HBcAg, and CpG adjuvant. This vaccine formulation elicits forceful humoral responses directed against HBsAg/HBcAg, and promotes a Th1/Th2 balance response against HBsAg and a Th1-biased response against HBcAg in both C57BL/6 and HBV transgenic mice. Vigorous cellular immune response was also detected in HBV transgenic mice, for a significantly higher number of HBs/HBc-specific IFN-γ secreting CD4+ and CD8+ T cells was generated. Moreover, vaccinated mice elicited significantly intense in vivo CTL attack, reduced serum HBsAg level without causing liver damage in HBV transgenic mice. In summary, this study demonstrates a novel therapeutic vaccine with the potential to elicit vigorous humoral and cellular response, overcoming tolerance in HBV transgenic mice.

The electrical strength of outdoor insulators may decrease and the flashover accidents occurred in the past years. Researchers have carried out the discharge characteristics investigation on outdoor insulators in the sand storm, however it is still necessary to the study the discharge/flashover characteristics in floating dust weather since the investigation is still undergoing and conclusions not fully agreed by the researchers. In this paper, an artificial climate chamber is designed to resemble different dust environment and the breakdown voltage characteristics of typical electrode assignment are discussed carefully. Two diameters of rod-rod electrodes, Ф6 and Ф16 are utilized in the experiment and the concentration of dust in the chamber is controlled in the range of 200–1200µg/m3. The relationships between the breakdown voltage under AC supply with different dust concentration in the electrode system of Ф6 and Ф16 are shown in this paper. From the experiment, it is obvious that the breakdown voltage decreases with the dust concentration in the Ф16 rod-rod electrode system while a minimum value may appear in the Ф6 rod-rod electrode assignment. The possible reason is the present of dust in between the gap may contribute in two ways; the first one is to adsorb free electrons and photons which will increase the breakdown voltage, the other one is to enhance the electrical field in the nearby region which will make the breakdown process easier to develop in contrast. The initial wind speed also has effect on AC breakdown voltage under floating dust weather.

With the expansion of the grid scale, short-circuit current is increasing, the safety of grid is seriously impacted by the short-circuit current. Therefore, a new technique of energy-saving transformer possessing variable impedance is proposed. This transformer combines the advantages of the high impedance transformer and fault current limiter, it can reduce the impact of short-circuit current and also take the economy into account. The principle of variable impedance transformer was introduced, PSCAD simulation software was used to analyze the current limiting capacity and the distribution of overvoltage of transformer. Researches indicated that variable impedance transformer could improve the ability to withstand short circuit current impulse through the adjustment of the impedance, short circuit current could be reduced by 40.2%, and the overvoltage could be restrained by novel suppression measure.

Considering the structural characteristics of high-rise residential with regular plane design, simple load condition and small height change of standard floor, a new frame formwork support is proposed. According to eigenvalue buckling analysis, the research proves its stability bearing capacity and mechanics properties. MF1225 bearing capacity is determined by the out-of-plane stiffness. Ledger and bottom reinforcing tube improves the longitudinal stiffness and integrity in frame system.

This paper presents a new offshore platform with rocking wall structure, and studies how to use the material more adequately by varying offshore platforms story rigidity. The results show that the greater the story stiffness, the more it can give full play to the material properties, as well as to improve the seismic capacity.

The erythrocytes play an important role in delivering oxygen and carbon dioxide in the human body. They are generally believed to be highly deformable and are able to squeeze through small capillaries. The elastic rigidity of the cell is associated to the change in free energy caused by both the stretch and the bending of the erythrocyte membrane. If the curvature of a shell is changed by deformation, the bending stiffness must be considered. However, researchers usually focus on the stretch of the cell membrane while analyzing the experimental data. In this article, mechanical models were proposed to study the erythrocytes deformation during optical tweezers stretching and micropipette aspiration. The effect of membrane bending stiffness on the cells deformability was concluded using finite element modeling and simulation.

Objective Endogenous hydrogen sulfide (H2S) has recently been shown to play an important role in inflammation, but the role of endogenous H2S in the human gingival tissue is unknown. The aim of this study was to investigate whether gingiva had enzymes for H2S synthesis, and whether the effect of these enzymes for H2S production changed with periodontal inflammation. Design Gingival tissues were collected from patients undergoing periodontal operation including gingivitis, moderate chronic periodontitis, severe chronic periodontitis and normal controls. RT-PCR and western blotting were performed to measure mRNA and protein levels of cystathionine β-synthase (CBS) and cystathionine γ-lyase (CSE) for H2S production. Immunohistochemistry was carried out to detect the location of the enzymes. H2S levels and synthesis in gingival tissue were evaluated with modified methylene blue method. Results The mRNA and protein of CBS and CSE were both expressed in human gingiva and raised significantly in moderate and severe periodontitis compared of that in healthy control. CBS, but not CSE, increased in gingivitis (p 0.05). Conclusions Both CBS and CSE were expressed in human gingival tissue. The mRNA and protein levels of CBS and CSE were up-regulated in periodontitis.

This paper proposes a low-frequency demagnetization method based on multi-objective optimization. The multi-objective problem on demagnetization can be solved by linear-weighted-sum method. Where, the weight coefficients can be calculated by an allocation method based on the polymerization degree of each objective function. For a 127 kV/11 kV, 50 Hz, 20,000 kVA single phase transformer, the optimal frequency calculated is 18.231 Hz, and the corresponding source capacity and demagnetization time are 425 kVA and 509 s, respectively. Further, this method is applied to a small toroidal transformer, and the results reveal that demagnetization with a 12.5 Hz source will make an excellent tradeoff between source demands and demagnetization time.

This paper proposes a novel remanence detection method for power transformers based on the modified Jiles-Atherton model. The residual flux can be determined accurately by inputting the same sources in DC tests to our simulation model. The value of remanence could be seen as the intercept on B axis of demagnetization curve in our Simulink model, and its polarity could be obtained by the current direction based on right-hand rule. The relative error of this detection method will not exceed 6.8% compared to experimental data.

Microstructure surface topography is a key aspect of micro-nano measuring research for it has an obvious influence on the performance and quality of micro-nano devices. Scanning white light interferometry is a common method of testing surface profiling. In this paper, a color CCD camera, rather than a black-and-white CCD camera, was utilized to acquire white light interference images, which contain information of RGB channels. Based on acquired color interference images, wavelet transform method was employed to calculate phase value of corresponding channel in each scanning position. Then zero-optical-path-difference positions were accurately determined via a constructed evaluation function and least square method. Surface topography was eventually obtained via linear relationship of relative height and the zero-optical-path-difference position. The proposed method was verified by simulation and experiment of measuring standard step provided by VLSI Standards Incorporated.

As a hot technology for access network, EPON(Ethernet over Passive Optical Network) combines the advantage of PON technology and Ethernet technology. But the management of EPON has become problems needed to be resolved. The paper analysed the features of EPON and then chose the suitable network management protocol. Making use of Stratified thought and database technology, A scheme of EPON network management is detailed designed to manage the EPON. The design ensures that network element can normally effective operate.

Key technologies of Disaster Tolerant Intelligent Network are briefly introduced at first. After the hot-standby Disaster Tolerant IN architecture is analyzed, a load-sharing mode is proposed which has no downtime during switchover. By constructing the availability models of local clustered subsystem and the load-sharing Disaster Tolerant IN system based on Birth-Death process, it is proved that the load-sharing- based Disaster Tolerant IN system can meet the high availability requirement for disaster tolerance.

Most security issues of wireless network are focused on preventing attacks from the outsiders or wireless users. However, these authorized wireless users have no right to take part in the drawing up security policy of an organization. Besides, the larger network scales the more difficulty to be maintained. Patching and managing the mass of computer vulnerabilities are a timely but critical issue. A system, the integrated vulnerabilities management system, is proposed to help users efficiently accessing information, easily getting solutions and conveniently communicating others. Not only the security administrators can get aid but also the other managers and employees could be supported with this system.

With the development of web services application, some issues of web services security are increasingly prominent. XML is widely used of its high expansibility as a platform-independent language. After analysis the traditional web services security technology, this paper formulates the XML signature, as the basis of web services security technology, and describes how to create and verify signature. An implementation of XML signature in the Web services security is illustrated in Java.

Problem-Based Learning is a way which centres on students’ self–educated learning and questions’ researching. With the development of the network technology, the learning pattern of the network Problem-Based Learning becomes more and more popular. To build a series of network learning platform of education technology which have powerful function, has put forward some new requirements. The article explained the basic process about building a Problem-Based Learning platform which based on JSP and Javabean technology according to J2EE.

Higher education computer fundamental course reform faced the 21st century has already been started in an all-round way. Innovation of teaching material's design philosophy is one of important contents that can't be ignored.The design and writing philosophy of university computer fundamental teaching material is summarized and reviewed leaded by the theory of Self-Directory Learning, and an example page is shown.

At first, this paper studies the status of data structure in the courses for computer science and technology specialty and its knowledge structure. Then, teaching method based on knowledge structure is proposed to raise students? motivation, to organize teaching contents reasonably, to select topic scientifically, and so forth.

Trust has been one of the main factors affecting electronic commerce. Web of Trust (WOT) is a certification system that allows your identity to be validated for use in your personal certificate. On the basis of introducing the concept of WOT, a trust evaluation model is proposed to assist the individuals to establish ldquoWeb of Trustrdquo in online trust domain. This model uses FOAF and can be used as a blueprint to develop e-commerce application.

Editing and transmitting of large number of mathematics symbols and formulas online is an important aspect of Web-based mathematics education and academic information exchange. MathML technology has offered strong support for this. On the basis of comparing and analyzing relevant technology, design a formula editing system based on MathML and put it into practice, an online mathematics forum. It realizes the function of formula's editing, releasing and displaying etc. online and has good platform independency, flexibility and expansibility.

Higher education computer fundamental course reform faced the 21st century has already been started in an all-round way. Innovation of teaching material's design philosophy is one of important contents that can't be ignored. This paper will summarize and review the design and write philosophy of university computer fundamental teaching material leaded by the theory of Self-Directory Learning.

Web-based testing is the trend of the modern educational testing. But how to upload the formula in the testing item easily is a difficult problem. At first, this paper formulates the main comprehension of PIA and the uploading strategy based on PIA. After that, as an example of its application, this paper introduces a Web-based mathematics testing system.

Improving operational sustainability may help U.S. general aviation (GA) airports improve overall sustainable development without substantial financial inputs. An exploratory multiple-case study of five GA airports was conducted to explore the current understandings of airport operational sustainability among U.S. GA airports. Based on findings, a new definition of airport operational sustainability for U.S. GA airports was developed. A set of performance metrics for measuring operational sustainability in U.S. GA airports was identified. The new definition may help GA airports to develop sustainable management plans, and may help airports in other categories to expand their sustainability perspectives. The metrics identified in this study may be used to measure progress to the sustainable development, identify problems, and set performance goals or targets for airports. Refereed/Peer-reviewed

The promulgation of Part 107 rules in June 2016 by the Federal Aviation Administration reduces the administrative burden for using unmanned aerial systems (UASs) and provides enhanced opportunities to utilize UASs in a variety of capacities. Previous studies such as the Airport Cooperative Research Program UAS primer have examined the framework for serving UASs as an aeronautical user, and there are anecdotal case studies that present the use of UASs for selected application; however, there has been limited documentation of the opportunities and challenges for the use of UASs for airport activities on airport property. This paper presents potential opportunities for the use of small UASs to enhance safety and operations in the airport environment and identifies the issues that will need to be addressed. Refereed/Peer-reviewed

The number of annual aircraft operations (take-offs and landings) is a significant concern to both airport owners and operators and to governmental agencies because operations data are one of the most important criteria used for determining future investments in airports. However, estimating the number of aircraft operations at non-towered general aviation airports is challenging work due to the lack of counts from air traffic control towers or useful estimates developed using models. Previous work in estimating annual aircraft operations has resulted in models and sampling methods that are imprecise or difficult to use. In 2014, new classification categories of 2,939 public-use general aviation airports in the United States were published in the National Plan of Integrated Airport Systems (NPIAS) 2015-2019 Report. The goal of this research is to determine if the new airport classification categories provide an opportunity to improve models for estimating aircraft operations at GA airports. This research used the FAA Form 5010 data reported by airport managers. Another potential source for operations is the TAF (Terminal Area Forecast). Both Form 5010 and TAF have inaccuracies for non-towered airports. The Form 5010 was selected because it is one of the sources for the TAF. Based on this study, the NPIAS categories were found to be significant in the regression model developed. Future research will investigate using TAF data. Refereed/Peer-reviewed