bluuebunny/crossref_metadata_2025 huggingface dataset:
Recommend Strategies for E-Learning 2.0 Communities
Authors: Wu Bing , Zhang Chen Yan
Published: June 2014

With the rapid progress of Web 2.0, E-Learning has evolved into E-Learning 2.0, which has been highlighted as an effective method for interactive learning. To improve the efficiency of learning, many researches focused on the personalized recommendation for knowledge sharing. However, these researches proposed the general recommendation system without considering the current knowledge sharing status in E-learning 2.0 communities. Therefore, the purpose of this study is to proposed recommend strategies according to characteristics of E-Learning communities based on social network analysis. Firstly, knowledge activity nodes in E-Learning communities are identified into four types. Secondly, based on four node types, E-Learning communities are classified into four corresponding types. Then, different recommend strategies are provided according to the types of E-Learning communities. Finally, conclusion and future research direction are discussed in the end.
Research on Automated Testing Process Model for UOF/OOXML Translator
Authors: Zheng Jin Qin , Mu Yong Min , Zhang Zhi Hua , Zhang Ya Nan
Published: June 2014

There are some issues in the manual test of UOF/OOXML Translator, such as the low efficiency, difficult measurement of test case coverage and project delay. This paper brings about the automated testing process model based on the manual V model of UOF/OOXML Translator, and proposes the implementation scheme of automated testing process through analyzing test case automatic generation, test case management, automatic contrast of function points and defects management. The experiments have shown that this model can effectively manage test cases and defects, and even replace manual testing partly. Besides, this model can improve testing efficiency and reduce test workload, preventing the defects occurring in the late project stage.
Software Design of Personnel Management System in University
Authors: Xiao Dian Min
Published: June 2014

This paper presents a unified personnel management system modeling language design. Unified Modeling Language is the use of object-oriented visualization, documentation and other standardized modeling language. The system uses the most popular B / S architecture, the choice of Microsoft's ASP.NET web development carried foreground, background database selected Microsoft SQL2005, through a combination of the two can give full play to the efficiency of personnel management software and have security features.
The Multilevel Algorithm of Chinese Sentence Similarity
Authors: Zeng Xiao Qin
Published: June 2014

This paper puts forward a multilevel algorithm of Chinese sentence similarity on the basic of predecessors' research. The algorithm considers disordered similarity and ordered similarity: disordered similarity is obtained by computing the ratio of synonyms after Chinese segmentation; ordered similarity is got by calculating the corresponding similarity of component location words. Meanwhile, the sentence pattern conversion is also considered, and if it be a Chinese question, sentence mood parameter need to be used to modify the result. Finally the algorithm rationality is verified by contrast experiment.
Research of Information Integration Based on XML Schema Matching
Authors: Gou He Ping , Jing Yong Xia , Zhu Ya Ling
Published: June 2014

Information integration is one of core problem for enterprise, the automatic integration for heterogeneous information is important to solve this problem. So this paper presents the method for information integration based on XML schema matching to realize information transport and integration across heterogeneous platforms. In this method, the Web services is adopted to solve the heterogeneity of data platform, the information is transformed to XML model, the schema integration is completed according to the XML schema matching, and the mapping relationship between different XML schema elements is created accordingly. When the user accesses the heterogeneous information, the mediator implements the instance integration according to this mapping relationship. Experiment indicated that this method can realize the information integration automatically.
The Use of Modified Unified Theory of Acceptance and Use of Technology to Predict the Behavioural Intention Toward Website
Authors: Indrawati Indrawati
Published: June 2014

The availability of website for an institution is very important, especially for an educational institution just like ABC University. The website can become a mean of communication from the institute to its stake holder: students, parents, industries, lecturers, administrators, and government or from the stakeholders to the institution. The availability of website is also important to increase the image of the institution, since there is university web ranking published by WeboMatrix. ABC University has already built its website and communicated, socialized as well the availability of its website to all students, lecturers, and administrator. So far the adoption of the websites by students, lecturers, and administrators especially by using the Modified Unified Theory of Acceptance and Use of Technology (UTAUT) model has not been explored. This lack of knowledge motivated the researcher to conduct this study. This study investigates the key factors that affect the behavioral intention and used behavior of customers toward the use of the website in ABC University Indonesia. The approach employed for this study is based on a modified unified theory of acceptance and use of technology (UTAUT) model. A survey method was employed to gather data from 310 respondents coming from the students, lecturers, administrator, and management. The collected data was analyzed using a quantitative investigation. The partial least squares (PLS) method was used to quantitatively evaluate the impact of the key constructs of the modified UTAUT model. This research clearly confirmed that modified UTAUT model which consists of performance expectancy, effort expectancy, social influence, facilitating conditions, and content can be used to determine behavioral intention of consumers to use Website.
Research and Design on Integrating RFID System in Automotive Manufacture Based on Web Service
Authors: Xie Hao Fei , Li Chong Yang , Zhang Guo Qi , Su De Long
Published: June 2014

In order to remedy the deficiency of application of bar code that needs artificial intervention in automotive manufacture, we propose a solution to integrate Radio Frequency Identification (RFID) system in the original enterprise information system based on Web service. Distributed real-time data of welding, lacquer covering and assembly workshops in the automotive manufacture are collected, that are used in the enterprise information system to provide more productions information for management. Firstly, the architecture of integrating the RFID system and the Manufacturing Execution System (MES) in automotive manufacture is given, that is focused on the RFID system network, the Middleware and the Application Gateway. Finally, web service implementation is designed to integrate RFID system in enterprise information system.
Analysis on Digital Management of the Universities Library
Authors: Han Ling
Published: June 2014

Colleges and universities library was playing an important role in development of university education. Based on the digital management collection, storage and management of information were more high efficiency. The unitive and compatible database plat could satisfy the need of the different groups. In this paper, characteristic, magazines management and information service of the digital library were discussed. During construction of digital library the problems and development of digital library were analyzed.
The Design of Enterprise Cooperative Platform Based on Workflow
Authors: Qin Min , Qiao Shi Quan
Published: June 2014

At present, the enterprise has many business processes. It need transfer many forms involving personnel, procurement and other aspects. The workflow management system uses computer network to realize the automation of the business process. This paper analyses the workflow management system, describes the operational principle of the workflow engine and presents a cooperative platform design based on workflow. It can effectively track the whole process and realize standardized management. Otherwise, it can enhance the enterprise business operation efficiency.
A Realization of Large Capacity, High-Speed Data Acquisition and Storage System
Authors: Xie Min , Zhao Fu Hai , Tang Guo Pin
Published: June 2014

With the rapid development of the high-speed digital signal processing in radar, spaceflight electronics and communication areas, faster acquisition rate and larger storage capacity in data acquisition and storage system are required. A interleaved sampling architecture is present to improve the acquisition rate, in which the NAND flash is used as the storage medium and pipeline structure is adopted to improve storage capacity and storage rate.
Analysis of Emissions from Selected Wood Charcoal Species Combustion
Authors: Dirner Vojtech , Dobeš Albin , Király Alexander
Published: June 2014

This study quantified selected emissions (carbon monoxide and nitrogen oxides) that are produced during combustion of beech wood, birch wood and spruce wood charcoal in the combustion tube furnace. The maximum concentration of carbon monoxide and also the nitrogen oxides have been measured in the case of the spruce wood charcoal. The minimum concentration of carbon monoxide and also nitrogen oxides have been measured in the case of the beech wood charcoal. Although the difference between maximum emissions concentration of examined samples has been smooth. The comparison of obtained results with data published by previous studies can be made a suggestion, that the maximum concentrations of measured emissions are higher for wood than for charcoal. The nitrogen oxides yield per weight loss is higher for wood than for charcoal. On the other hand the carbon monoxide yield is higher for charcoal than for wood.
Optimization of Oil Pipe Arrangement with Compensation Conditions
Authors: Wei Dong Ping , Zhao Hong Ya , Lei Tian Li
Published: June 2014

Oil pipelines usually pass through suburbs areas and urban areas. When the pipeline occupy some private properties, the compensation to private properties owners is necessary. In fact, the oil pipe arrangement is very complicated when the unit cost in suburbs and urban areas is different. Hence the oil pipe arrangement scheme with compensation conditions is proposed to study the complicated problem. The model shows that compensation cost can affect the pipeline arrangement very sensitively. The model can obtain the optimal scheme to construct oil pipe when given different compensation cost.
An Algorithm of Improving Least-Square Method on Tracing Accuracy of Bistatic Sonar System
Authors: Sun Yong , Zhao Jun Wei
Published: June 2014

The least square algorithms were widely used in the estimation of localizing and tracing situation in military fields. In this paper, we proposed a method of using a full rank matrix instead of using singular value decomposition to solving the non-full rank matrix. Therefore the improving least square (ILS) algorithm was emerged at this situation. The simulation results show that the proposed tracing algorithm exhibits higher accuracy compared with the least square algorithm. This new method can take full application of the measured information to improved the tracing accuracy in the whole controlled area.
Stress Distribution Characteristics in Rock Surrounding Heading Face and its Relationship with Temporary Supporting
Authors: Chen Zhong Han
Published: June 2014

To solve the problem of underground tunneling face from the empty top, using FLAC3D analysis software, surrounding rock stability for coal roadway 2-1121 of Ganhe Coal Mine are analyzed in numerical calculation. (1) During the tunneling, distance drivage face head-on 0.5-1m at the roof of roadway deformation and destruction features are more obvious, the two sides of roadway are even more significant. (2) Ganhe Coal Mine roof deformation has been established with different empty the experience formula of the zenith distance, obtained Ganhe underground tunneling face reasonable empty zenith distance is 3.5m. (3) Temporary support can obviously reduce roof deformation, reduce thickness of plastic zone of the top, to improve the stability of surrounding rock tunneling faces.
The Development and Characteristics of Electromagnetic Riveting Technology
Authors: Gong Cheng , Wang Song Ling , Jiang Ming
Published: June 2014

This paper introduces the elements, production, development, strongpoints and application of electromagnetic riveting. It analyses the effect of different length of rivet on the connection. The transmutation of rivet is well proportioned. As the length increases, the symmetry of rivet decreases. This paper compares pneumatic riveting and electromagnetic riveting, and expatiate the strongpoints of electromagnetic riveting, such as one time forming, easy to control, symmetrical transmutation, low undulation, steady connecting quality, easy to rivet. Finally, this paper summaries the electromagnetic riveting technology and calls attention to it.
Analysis of Energy Loss-Gain Error in Discrete Fourier Transform
Authors: Liu Yao Lin , Han Feng , Liu Zhen , Zhai Min Chen
Published: June 2014

In asynchronous sampling, discrete Fourier transform (DFT) spectrum involves errors. Scholars have done great investigations on the correction techniques of DFT spectrum, but the errors have not been completely eliminated all along. In this paper, spectrums were examined from the principle of conservation of energy. It is unnoticed before that the energy of the digital signal, which is the analysis object of DFT, isn't equal to that of the finite continuous signal truncated by rectangular window. Thus the energy of their spectrums are different according to the Parseval's theorem. The Energy Loss-Gain (ELG) error was introduced to express the energy difference between these two spectrums. The ELG error is zero if the observed continuous signal is truncated in integral multiple of half cycle and it is related to the cycle number and sampling number in one cycle. Analysis show that the ELG error decreases with the increment of these two parameters, which are helpful to the engineering.
High-Speed Photogrammetry Application for Percussive Rotary Cutting Tests of Deep-Ocean Cobalt-Rich Crusts
Authors: Zheng Hao , Liu Shao Jun , Gan Hai Ren , Yang Ning
Published: June 2014

The cutting processes of drill rod under different surge pressures, rotate pressures and propulsion forces were recorded by the high-speed camera in the hydraulic percussive rotary cutting tests of deep-ocean cobalt-rich crusts. Meanwhile, the curves of impact vibration, torsional vibration and frame vibration during the cutting processes were plotted by digital picture processing technique. The impact frequency, torsional vibration frequency, torsional vibration amplitude, vibration amplitude of drill rod and the frame were calculated. The photogrammetry results are generally in agreement with the traditional test results. High-speed photogrammetry is a non-contact, wide range application, and high precision measurement, and the cutting process can be described visually and adequately.
Analysis of the Impact on Doppler Frequency Shift of the Signal Caused by Receiver’s High Dynamic Environment
Authors: Du Xiao Jing , Zhang Wen Bo , Wang Song Bo
Published: June 2014

The Doppler frequency shift of the signal received from receiver carrier in high dynamic environment which means high speed and high acceleration represents different changing rules. The changing rules can make the positioning accuracy become worse and even make the receiver unable to track the signal. On the basis of modeling and simulation of three high dynamic carriers including the aircraft, satellite and ballistic missile, the changing rules of Doppler frequency shift were analyzed using the calculation equation of the Doppler frequency shift. The results show that for the high dyanmic carriers, the larger the velocity of the carrier is, the larger corresponding Doppler frequency shift is and the larger the acceleration of the carrier is, the larger corresponding changing rate of Doppler frequency shift is.
Research on Raising Load Potentials Using MPCM Slurry Storage
Authors: Zhao Guang Wei
Published: June 2014

Evaporative cooling is able to generate the cooling medium at a temperature approaching to the ambient wet bulb temperature. In this paper, a low-energy air-conditioning strategy is proposed, which is a combination of cooled ceiling (CC),microencapsulated phase change material (MPCM) slurry storage and evaporative cooling technologies. The assessment of evaporative cooling availability and utilization is done for five representative climatic cities, including Hong Kong, Shanghai, Beijing, Lanzhou and Urumqi in China, and the energy saving potential of the proposed air-conditioning system is analyzed by using a well validated building simulation code. The results indicate that the new system offers energy saving potential up to 80% under northwestern Chinese climate and up to 10% under southeastern Chinese climate. The optimal design method of the slurry storage tank is also proposed based on the slurry cooling storage behaviors and cooling demand variations of the ceiling panels.
Design and Simulation of Aero-Engine Combination Vortex Fuel Pump
Authors: Fu Jiang Feng , Li Hua Cong , Li Jia , Wang Shu Hong
Published: June 2014

To solve the problem that single stage booster pump has the problem of low oil pressure at low speed condition. Paper gave a design method for three stage combination vortex pump which uses radial series. The preliminary structural parameters of the vortex pump were designed by using the empirical coefficient method. Then Hex/Wedge grid is used to generate mesh for the established 3D model of the vortex pump. The final structure parameters were obtained by CFD numerical simulation optimization iterately. Finally, the flow field of combination vortex pump was analyzed. Simulation results show that: The combination vortex pump meet the design requirements.
Numerical Investigation of Liquid Parameters Effect on the Oscillation of Cavitation Bubble
Authors: Liu Xiu Mei , Li Bei Bei , Li Wen Hua , He Jie , Lu Jian , Ni Xiao Wu
Published: June 2014

Cavitation is a common harmful phenomenon in hydraulic transmission systems. It not only damages flow continuity and reduces medium physical performance, but also induces vibration and noise. At the same time, the efficiency of a system is reduced due to cavitation, especially dynamic performance are deteriorated. Applying commercial CFD software FLUENT, the cavitation issuing from the orifice was numerically investigated, reducing the harm. The effect of liquid parameters (such as surface tension, gas content, and the temperature) on the oscillation of bubble is studied numerically. The modified Rayleigh-Plesset equations are presented to describe the oscillation of bubble in different liquids. Employing the finite difference calculus, the behavior of a cavitation bubble in liquids with different physics parameters are obtained. Meanwhile, the numerical results are compared with experiment results. It is observed that the viscous force decreases the growth and collapse of a bubble, making it expand or collapse less violently. And the surface-tension forces stave bubble growth progress and speed up bubble collapse process. On the other hand, both the maximum bubble radius and bubble lifetime increase with increasing temperature. These results can provide theory basis for understanding cavitation bubble dynamics in the hydraulic systems.
Analysis of Tracking Performance about DS/FH TT&C Based on Ambiguity Function
Authors: Liang Sheng , Wei Ying Yong , Pan Gao Feng , Xie Yong , Xue Jun
Published: June 2014

After introducing the ambiguity function theory of radar analysis, wideband ambiguity function about Direct Spread/Frequency Hopping (DS/FH) signal is derived out in this paper. From the point of signal simulation ambiguity figure, the tracking performance is studied and analyzed, that includes ambiguity character and signal resolution under the influence of frequency switching time and phase discontinuous. Conclusion shows the following design difficulty based on feasibility in DS/FH TT&C.
Research on New Strucural Aero Fuel Centrifugal Pump Design
Authors: Li Jia , Li Hua Cong , Fu Jiang Feng , Wang Shu Hong
Published: June 2014

A inducer and impeller combination aero fuel centrifugal pump design method was given. Based on empirical coefficient method the preliminary structural parameters of the combination Centrifugal pump were designed firstly. Then the Centrifugal pump Hybrid Grid model was built with muti-block structure and octree style.The final structure parameters were obtained by CFD numerical simulation optimization. Finally, the flow field of combination Centrifugal pump was analyzed and compared simulation datas with test datas by making the test samples.The relative error of the design point doesn’t exceed 5%, indicates that the inducer and impeller combination pump meet the design requirements.
Distributed Energy Resources’ Characteristics and its Integration Modes of Active Distribution Network
Authors: Zeng Bo , Wen Jun Qiang , Zhang Yu Ying , Zhang Jian Hua , Yang Xu , Liu Wen Xia
Published: June 2014

Specifying technical features of all kinds of distributed energy resources in operation control is the foundation of deploying active distribution network. This paper analyzes the technical characteristics of various distributed energy resources (DER) including micro-turbines, wind turbines, photovoltaic generations, distributed energy storage devices and flexible loads (FL), and discusses the demand response (DR) mechanisms and controllability of FL profoundly. Furthermore, on the basis of the economy and the reliability of the overall system, the in-depth study of active distribution network (ADN) typical integration modes which adapt to a low-carbon environment are carried out.
The Design of Digital Medium Frequency Induction Heating Power Supply Based on DSP and FPGA
Authors: Sun Meng Juan , Song Jian Guo , Huang Zhi Qi
Published: June 2014

DSP (XC2267) is the main control chip which does the increment PI algorithms and realizes the voltage and current double closed-loop. Three-phase thyristor rectifier method based on the phase self-adjusting of FPGA is proposed. A method for swept-frequency start circuit is designed to implement the transition between the high-power and low-power. The invert system uses the compound control of improved PWM and frequency phase lock to improve the control accuracy and efficiency. Lastly, by using bench, the circuit is tested and the feasibility and effectiveness of the whole system are verified.
Balanced Biorthogonal Multiwavelet with Symmetric/Antisymmetric Filter Banks
Authors: Zou Qing Yun , Cao Qian
Published: June 2014

A class of the balanced biorthogonal multiwavelets was constructed by defining a specific matrix filter structure, in which the multifilter banks of multiwavelets have had the desired symmetry. Here, the multifilter banks have possess symmetric/antisymmetric, which resembled filters of scalar wavelet and have in favor of application, notwithstanding the multiwavelets constructed in this paper have lost the linear phase, so they have formed a new type of multiwavelets undoubtedly.
Analysis of Localizer Over-Bending at Coastal Airport
Authors: Xiao Chuan , Feng Jun Hong
Published: June 2014

Inaccurate alignment with the runway centerline caused by localizer over-bending, will make the aircraft’s approach unstable, and hinder the timely and correct establishment of landing configuration, even threat the safety of aircraft. Targeting at the problems above, and according to the actual operational circumstance of coastal airport ,this paper, based on the performance specification of instrument landing system and character analysis of localizer over-bending at coastal airport, presents the relationship between localizer bending extent and the distance from the runway centerline to the coastline. Meanwhile, corresponding mathematics model is built and related simulations have been done, which effectively enhance the crew’s situation awareness of localizer over-bending and improve the aircraft’s landing safety at coastal airport.
Relationships between Road Safety and Traffic Volume Based on Fuzzy Matter-Element Model
Authors: Zhang Sheng Nan
Published: June 2014

In order to study road safety as well as the relationship between traffic volume and traffic safety, we introduce matter-element model to build safety evaluation system. In this model, we can get quantitative values of the degree how much it belongs to the certain safety level, including six security indexes such as traffic volume, traffic density and traffic-flow speed, as well as four different security levels. By combining two traffic conditions of the same section, we change the initial parameters of the traffic model to get security level grades of the two conditions. The results showed that with the increase in traffic volume, road safety decreases. However, when the traffic volume increases further, the road safety increases instead.
Comments on Errors of DFT Spectrum
Authors: Han Feng , Liu Yao Lin , Liu Zhen , Zeng Hai Dong
Published: June 2014

Discrete Fourier transform (DFT/FFT) spectrums contain a variety of inherent errors in asynchronous sampling. Spectrum analysis with the accuracy above 10-3 are generally challenging issues. This work divides the DFT procedure into four signal transforms and exams six spectrum errors originated from these distortions. Besides the review of traditional errors, a so-called energy loss-gain (ELG) error is briefly introduced, which is proved to be a considerable error on the basis of Parseval's theorem. With the help of full error analysis mentioned here and the further development of analytical error estimators, it is expectable to obtain a DFT spectrum with a specified accuracy.
Chemical Composition and Application as Biomaterials of Essential Oils from Ledum palustre of Changbai Mountain China
Authors: Qu Ge , Li Bao Feng , Zhao Hai Ming , Du Feng Guo , Sun Guang Ren , Wang Rui Jian
Published: June 2014

Ledum palustre is an important perfume plant in northeast China, and widely distributed at Changbai mountain of Jilin province. The components and contents of essential oils in Ledumpalustre were highly correlated with their growth environment. By using GC-MS, about 32 compounds were identified from Ledumpalustre essential oils of Changbai mountain. The chemical components were L-bornyl acetate (20.2%), 1,2,3,4-tetramethyl-benzene (16.5%), (−)-myrtenal (4.4%), terpinen-4-ol (4.3%), 2,6-dimethyl-2,6-octadiene (3.8%), trans-pinocarveol (3.7%), L(-)-borneol (3.0%), geranyl acetate (2.8%), (+)-aromandendrene (2.3%), ledol (1.7%), sabenene (1.6%), β-pinene (1.4%), camphene (1.1%), caryophyllene oxide (1.1%), and citronellyl formate (0.5%), which indicate the application of Ledumpalustre essential oils from Changbai mountain should be different from other areas.
Hepatoprotective Effects of Saponins from Rhizoma panacis majoris on Hepatic Fibrosis Induced by Carbon Tetrachloride in Rats
Authors: Zhang Ji Hong , Shi Meng Qiong , He Hai Bo , Bai Cai Hong , Wang Jun Zhi , Cheng Fan , Liu Guang Yao , Deng Wei , Zou Kun , Chen Zhi Feng
Published: June 2014

Saponins from Rhizoma Panacis Majoris (SRPM), the bioactive component in Rhizoma Panacis Majoris, have been used extensively as a remedy for liver injury diseases and achieved good clinical efficacy, but the underlying mechanisms remain poorly understood. The goal of our present study was to further confirm SRPM hepatoprotective effect, and evaluate that whether SRPM attenuate oxidative stress and fibrosis in carbon tetrachloride (CCl4)-induced hepatic injury, based on these results, investigate the probable mechanisms involved. At first, the separation and purification of SRPM were studied. And then, in the animal experiment, the male Sprague-Dawley rats were randomly divided into control, model, l-SRPM and h-SRPM group. Hepatic fibrosis model were made according to our previous studies reported. At the same time, the experimental rats were treated respectively with relative drugs, once a day for 8 weeks. Hepatoprotective effects of SRPM were evaluated by liver function, total antioxidant capacity and total-superoxide dismutase, histopathological observations and the hepatic fibrosis relative gene expressions. In the study, we found that SRPM significantly improved liver function, serum antioxidation level, reversed the upregulated α-SMA and TIMP1 mRNA expressions, and further increased the MMP1 mRNA expression. Our studies indicated that SRPM exerted beneficially hepatoprotective effects on the CCl4 induced hepatic fibrosis, mainly enhancing liver tissue antioxidant capacity, reducing the lipid peroxidation of hepatocyte membranes, and then alleviating hepatic fibrosis and hepatic cell death.
Kinematic Analysis on Jaeger Salto Stretched to Hang on HB of Elite Athlete on Uneven Bars
Authors: Xu Da Xue , Kang Jian Ping , Xu Xian Guo , Zhou Ji He
Published: June 2014

The uneven bars are among one of the advantage projects of Chinese women gymnastics team, and Jaeger Salto stretched to hang on HB belongs to difficult E group action. We made kinematic analysis of Jaeger Salto stretched to hang on HB of the elite uneven bars athlete Huidan Huang on the 2013 National Games of the women's gymnastics qualifying, The conclusive kinematic characteristics of this high skilled element can provide useful information for the technical training of coaches and athletes, and enrich gymnastic theories.
The Implementation of Quality Education through Experiment Teaching of Computer in Higher Vocational College
Authors: Wang Rong , Sun Ai Min , Zhang Bo Ping
Published: June 2014

In the comprehensive implementation of quality education environment, in higher Occupation Technique College ,the reform of experimental teaching is imperative. Around the theme of the implementation of quality education, according to the characteristics of the experimental teaching of Higher Vocational Education, taking Luohe Vocational Technology College "computer hardware laboratory" teaching as an example, To investigate how to implement quality education.
Construction of Practical Teaching System of E-Commerce Major in High Vocational Colleges Based on Enterprise Education
Authors: Zhao Sheng , Shi Xue Kui , Sun Yong Dao
Published: June 2014

Under the influence of thought of enterprise education, new challenges are posed to practical teaching system of e-commerce major of cultivating compound talents. The paper combines the present hotspot of requirements of enterprise education for training entrepreneurial ability and constructs new-type and open practice system of e-commerce major in high vocational colleges based on enterprise education so as to adapt to the current needs for cultivating e-commerce professionals.
Load Forecasting of Charging and Swapping in Large-Scale Electric Vehicle
Authors: Ye Jian Cheng , Li Yu Ling , Zhang Dong Liang , Zhu Xiang Jing , Zhu Jin Da
Published: June 2014

This article combs the charging mode of electric vehicle,and analyzes different charging ways for buses,taxis and sedans,thereby drawing their appropriate charging time and characteristics of the interaction with grid. The paper establishes the load calculation model for the charging and swapping in Evs respectively. The load calculation model divides one day into 1440 minutes, and use the Monte Carlo simulation algorithm to extract the initial SOC, the initial charging time and other information for load calculation and analyze the EV charging load. The results show that the charging load of electric vehicle has obvious difference between peak and vally,and provide reference for the management and policy oriented electric vhicle access network.
Antiaircraft Missile for the Group Target Shooting Performance Model and Simulation Analysis
Authors: Jiang Xiong , Liu Peng Yuan
Published: June 2014

Through selecting antiaircraft missile firing on group performance indicators and target shooting performance analysis modeling, digital simulation algorithm for the simulation model with examples, drawn Shots with different parameters of various simulation results, and the conduct of the analysis. This performance assessment and equipment antiaircraft missile system construction is important。
Fire Spread Model for Drum-Tower District of Tianjin Based on Cellular Automaton
Authors: Wang Hong Po , Zhou Hong
Published: June 2014

The Drum-Tower District is a historic site in the Inner place of Tianjin which represents the commercial culture,ecdemic culture,exotic culture and civilian culture of Tianjin. The buildings of this region are usually made of wood and other highly combustible materials. Once there be a fire, the influence will be very serious. The study of fire spread model Drum-Tower District is necessary. In the model of fire spread the cellular automaton rules were used. The effects of the different influence coefficients on the evacuation time were investigated, and the typical characteristics of space-time dynamics were analyzed. The numerical simulations show that the model is very good and can be used as a tool to predict fire.
Development of Data Acquisition and Control System with High Speed and Long Distance
Authors: Zhao Lan Hao , He Xiao Feng , Luo Long Jun , Yan Xue Wen
Published: June 2014

A data acquisition and control system for a safety valve test bench with high pressure and large flow rate, was developed based on the host-slave architecture, which takes an Industrial Personal Computer (IPC) as host computer and a Programmable Automatic Controller (PAC) as salve computer. The hardware architecture and software design of this system were introduced in detail. This system was verified by the experiment, and the results indicate that it can fulfill the requirement of data acquisition and control with high speed and long distance. This study can provide reference for many automation control fields.
Multicomponent Signal Detection and Parameter Estimation Algorithm of Synchronization Nyquist Folding Receiver
Authors: Li Rui , Chen Dian Ren
Published: June 2014

Nyquist Folding Receiver is a novel reconnaissance receiver structure which is able to use single ADC to sample Ultra-wideband signals. And the Synchronous Nyquist Folding Receiver (SNYFR) is an improved structure of NYFR. When input is multicomponent single-frequency signal, with the consideration of the characteristics of the output we propose an algorithm of Nyquist Zone(NZ) judgment and parameters estimation based on scaling search in Fractional Fourier Transform (FRFT) domain to avoid detection error occurring when the input signal components locate in the NZ fuzzy area. Computer simulation show that when SNR beyond, the Probability of Correct Decision(PCD) of signal detection can be achieved 100% and the mean square error of parameters estimation can be approached Cramer-Rao Bound(CRB) simultaneously.
The Functional Study of Artificial Heart Valve Based on HHT
Authors: Liu Bin Bin , Zhou Ke Liang , Ye Cen , Zhang Ming Li
Published: June 2014

The functional study of artificial heart valve has the positive significance on the postoperative care of the patients with valvular heart disease and the precaution of postoperative complications. The analysis of the heart sounds is the most direct way to estimate the function normally of heart. Because of the heart sound is nonlinear and nonstationary. Compared with the normal method of time-frequency analysis, Hilbert-Huang transform can analyze the nonstationary and nonlinear signals more accurate and more effective. Hilbert-Huang transform is introduced to the functional study of artificial heart valve. It used for extracting the inherent characteristics. Using the empirical mode decomposition (EMD), the heart sound was decomposed into a series of intrinsic mode functions (IMF). The Hilbert spectrum was established by the calculating results of these IMFs. The Hilbert spectrum has the characters of time-frequency-energy, and then the marginal spectrum was structured. Comparison with the characters of pre-operation and post-operation was used for reveal the function of artificial heart valve. At last, we use the short-time average energy and the short-time average range to verify the credibility of Hilbert-Huang transforms method. The result of simulation show that this method was well analyzed the function of artificial heart valve.
Bending Curvature Measurement Based on Fiber Optic Technology and its Applications in High Voltage Switch
Authors: Sun Yin Shan , Zhong Jiang Ying , Wang Zhen , Zhang Wen Tao , Di Hai Ting
Published: June 2014

The advantages of fiber optic sensors in contrast to conventional electrical ones make them popular in different applications. In the field of strength of materials, structure curvature is an important parameter. The limitations of traditional curvature measurement technology and the characters of fiber optic sensors are analyzed. The research status and characters of curvature measurement of different type fiber optic sensors are introduced. Potential and some successful applications of fiber optic sensors in high voltage switching are presented. It is reasonable to believe that the fiber optic sensing technology is a hot research topic in high voltage equipment fields for next a long time.
Weak Signal Detection Method in a Stronger Noise Background
Authors: Wang Jun , Bai Jian Ming
Published: June 2014

When we use the laser auto collimation theodolite to measure the azimuth error angle of air target, the strong noise background reduces the spot imaging quality and seriously influences the measuring angle ability of the theodolite. In order to solve the problem, a photoelectric detection system used to detect the weak signal is designed based the correlation detection principle and the principle of correlation detection technology is introduced. We use Simulink software presenting a simulation to the detection system and do a feasibility analysis. Finally, it’s proved that the photoelectric detection system could suppress the strong noise background, improve the SNR greatly and detect the weak signal effectively.
Objective Speech Quality Evaluation Based on Matlab
Authors: Wang Ji Xiang , Dong Shu Li
Published: June 2014

The speech quality is one of the most important indexes to evaluate the communication system. The objective evaluation is the last goal that people have been pursuing. The most efficient evaluation methods based on the spectrum distortion measure was analysed. The objective evaluation method based on wavelet spectrum distortion measure was simulated on the Matlab simulation environment. The simulation results show that Matlab was very suit to analyse the speech quality. The objective evaluation rules are found out on Matlab and the objective evaluation method was achieved.
A New Kind of Water-Squirting Ultrasonic Detector
Authors: Gao Yong Chun , Gao Xin , Xu He Ju , Wang Yi Ming , Zhen Li Chang
Published: June 2014

The water-squirting ultrasonic detector can not only reduce wetted area of specimen, volume of detection equipment, but also gain longitudinal wave, shear wave, and surface wave detection by changing the ultrasonic incident angle. The paper discusses the development of a new kind of water-squirting ultrasonic detector, which is based on the study of water immersion ultrasonic detector. In this detector, a removable water column replaces the fixed water container for maneuverability; a composited column replaces the water-only column for the ultrasonic coupling channel; a special optimized nozzle is used to form the composited column; an ultrasonic absorption intracavity and an air-water composited mixture are used for anti-interference. Finally, the new kind of water-squiring ultrasonic detector may replace the original water immersion detector, and can be applied to more extensive detection field.
Characterization of a Magnetic Field Probe for Electromagnetic Interference Current Measurement
Authors: Li Fan , Fang Wen Xiao , Lei Liang , Liu Yuan , Shi Chun Lei
Published: June 2014

This paper investigates a miniature rectangular triplate-printed antenna, which acts as a magnetic field probe to estimate amplitude of the RF Electromagnetic Interference current by non-contact measurement. To characterize the probe, a current transfer factor defined as the ratio of the probed voltage over the current is investigated by measuring the frequency-dependent S-parameter. Moving and rotating the probe will change the current transfer factor, and then significantly affect the estimation of the RF current under detection. To specify the application of the probe, the spatial dependences of the current transfer factor are systematically studied, and in agreement with the calculation of the magnetic field generated by the RF current.
CCD Camera Calibration Technology Based on the Translation of Coordinate Measuring Machine
Authors: Huang Feng Shan , Chen Li
Published: June 2014

A new CCD camera calibration method based on the translation of Coordinate Measuring Machine (CMM) is proposed. The CMM brings the CCD camera to produce the relative translation with respect to the center of the white ceramic standard sphere along the X, Y, Z axis, and the coordinates of the different positions of the calibration characteristic point in the probe coordinate system can be generated. Meanwhile, the camera captures the image of the white ceramic standard sphere at every position, and the coordinates of the calibration characteristic point in the computer frame coordinate system can be registered. The calibration mathematic model was established, and the calibration steps were given and the calibration system was set up. The comparing calibration result shows that precision of this method is equivalent to that of the special calibration method, and the difference between the calibrating data of these two methods is within ±1μm.
Design of Dual High Precision High Resolution Frequency Synthesizer Based on AD9854
Authors: Fan Ru Sen , Wang Yong , Yang Jun Jie , Wang Zhi
Published: June 2014

To obtain dual high-precision and high-resolution numerical control signal source, and accurately adjust the signal frequency, the paper proposed a method based on AD9854 direct digital frequency synthesis technology, design and implementation the dual high-precision and high-resolution frequency synthesizer. FPGA controlled AD9854 registers to achieve frequency modulation, and after amplification processing output by THS3001, increasing the output signal drive capability. Comprehensive consideration the anti-jamming measures, the system is stable and reliable, the output signal frequency range from 500Hz to 30MHz relative error is less than 10ppm, and can numerical adjust the sine and square wave frequency and has a sweep output mode. Compared with previous equipment, it reduces the system power consumption and volume.
Design of Dual High Precision Power Signal Generator Based on AD9854
Authors: Fan Ru Sen , Wang Yong , Yang Jun Jie , Wang Zhi
Published: June 2014

To obtain the dual high-precision numerical control signal source, and could be accurately adjusted the dual signals frequency and phase and increase the output signal power, the paper presented a method based on direct digital synthesis technology and parallel push-pull output, designed and implemented the dual channel high-precision and high power signal generator. MSP430 controlled AD9854 registers to realize frequency and phase modulation, after low-pass filter to adjust the square wave duty cycle by the DAC7612, amplitude was integrated optimization adjustment by AD9854 AD603 and power amplifier. Consideration the anti-jamming measures, the system is stable and reliable, and can output high-precision and high power sine and square wave in the 5-150kHz frequency band, signal frequency, phase, amplitude and duty cycle can numerical control. In addition, it has sweep output mode.
Development of a Novel High Voltage Cable Head Positioner for Scribing and Cutting
Authors: Zhu Fu Yun , Lu Zhi Hui , Ni Hong Jun , Wang Xing Xing
Published: June 2014

Principle of vernier caliper is a reference of the working principle of high voltage cable head positioner for scribing and cutting (HVCHPSC), considering the HVCHPSC is suitable for 35kV and below grade high voltage cable termination, the desired measurement range and position is 0-600mm and the measurement accuracy is 0.1mm of HVCHPSC are determined. According to the characteristics of production and installation process during 35kV and lower grade high voltage cable termination, identified the desired number of vernier on HVCHPSC is six, the required measuring span is 20mm. Designed and produced HVCHPSC, mainly constructed of a set of main scale and six sets of deputy ruler, each of which have a snap ring structure match with high voltage cable. Tests proved that the tool is easy to use, precise in positioning, well in performance.
Development of Stimulator Based on Audio-Visual Feedback Signal
Authors: Zhang Dong Heng , Xu Xiu Lin , Guo Xu Dong
Published: June 2014

To improve the muscle function handicap and enhance the body movement function of the stroke patients, a new medical instrument, based on audio-visual feedback, is developed. The designed stimulator regards sound (voice) and light signal (flash lamp) as the command signals. With remind of both voice and visualization signal, trainers can take the initiative to participate in training and try their best to generate a weak electromyographic signal. It provides a new treatment platform for stroke patients, which can play a positive role in the rebuilding of cerebral nerve net, the rehabilitation of body movement function diseases, the protection of brain function and psychological rehabilitation. The real-time monitoring and regulating function for the stimulating current was innovatively achieved. With the above functions, it’s easy for doctors to set up different stimulating intensities for different patients. This stimulator also has advantages of safer noninvasive, easy to carry and advanced human-computer interaction function, all of these make contributions to building up the muscle strength and the rehabilitation of body movement.
Key Technologies for Ground Pressure Monitoring System
Authors: Liang Hui Jun , Li Bi Tao
Published: June 2014

Ground pressure monitoring systems have been installed in many mines; there are several methods which have been used in this monitoring system, in this paper the key technologies are elaborated about ground pressure monitoring, which includes displacement sensors, the choice of power supply, the arrange of network, the serial-Ethernet convertor and human-machine interface’s design.
Accurate Capacitance Extraction in Equivalent Capacitor Substitution Method (ECSM) for Monopole Antenna Calibration
Authors: Song Zhen Fei , Xie Ming
Published: June 2014

Free-space methods for EMC antenna calibrations at Open Area Test Site (OATS) are not suitable for monopole antennas because of corresponding large wavelengths. The Equivalent Capacitor Substitution Method (ECSM) is adopted in ANSI and CISPR standards. One of major uncertainty factors of ECSM is the accuracy of capacitance. A novel capacitance extraction method based on full-wave impedance modelling is proposed in this paper, which is more accurate than conventional analytical formulae and experienced values, especially for practical monopole antennas, with a telescopic rod, or with a finite ground plane. A projection based model order reduction method is then utilized to achieve a compact macro-model. The capacitance value can be determined from the input impedance which is given by the macro-model output. The scheme and computational methodology of a developed calculation tool are introduced, together with some practical calibration data which indicates the effectiveness of the proposed methods.