bluuebunny/crossref_metadata_2025 huggingface dataset:
Structure Design of the Database in the INS/Database Matching Navigation System
Authors: Liu Fan Ming , Wei Xing , Li Fang Ming
Published: September 2013

Using the geophysical field data matching navigation could improve the concealment of the underwater vehicle, and it is also an important navigation technology in the future. Using the database to save the navigation data not only could overcome the drawbacks when using the files to storage the data but also integrated the different database together. The QNX Database is used to be the database management system (DBMS) of the INS/Database matching navigation system. According to the needs of the INS/Database matching navigation system and the relationship of the geophysical field data, the structure of geophysical field data database is designed and implemented. The result shows that the DBMS has well real-time performance, reliability and scalability. It meets the requirements of the DBMS.
Design and Investigation on Characteristics of a Semiconductor Micro-Ring Laser with Retro-Reflector Cavity
Authors: He Tao , Yuan Guo Hui , Wang Zhuo Ran
Published: September 2013

A miniaturized semiconductor micro-ring laser with retro-reflector cavity is investigated. By introducing higher order aspheric terms, miniaturized parabolic mirrors are designed and optimized. A Retro-Reflector based semiconductor micro-ring laser with equivalent radius of 38μm and low threshold current of 60mA is realized. The free-running wavelength is 1541.04 nm when the injection current is increased to 140mA.
Process Mining Based on Statistic Ordering Relations of Events
Authors: Zhou Huan , Lin Chuang , Deng Yi Ping
Published: September 2013

An explicit process model is vital in business processes. However, it is complicated and time consuming to create a workflow design. Also discords usually occur between the perceived management processes and the actual workflow processes. Under this condition, the process discovery techniques emerge. The aim is to rebuild a workflow model (e.g. a Petri net) of a business process based on the execution log. The model should give an abstract representation of the system and reproduce the log. This model can be further applied for process redesign/improvement and performance/reliability evaluation. In this paper, we present a new algorithm derived from α-algorithm for process discovery in term of Petri nets, where statistic long distance causal relationship is taken into consideration. Also this algorithm covers some shortages in α-algorithm.
Elements of Supplier Risk Assessment Based on Network AHP
Authors: Long Hai Hong , Zhao Ai Wu , Guan Hong Jun
Published: September 2013

This paper proposes that elements of supplier risk assessment can be divided into two parts, indicators of core competencies and executive capacity. It uses simple statistical method to establish indicators of supplier core competencies, and Delphi technique and Network AHP to establish indicators of supplier executive capacity. We can find out the relationship among the key indicators of supplier risk by the survey of Delphi technique, the weighting and ranking by Network AHP and set up the system by Super Decision.
The Design of Item Bank System of Computer Operating System
Authors: Du Qi Jun , Zou Ming Gui
Published: September 2013

According to the requirements of modern education theory and technology, combined with the actual teaching conditions of Computer Operating System, an item bank system is designed and realized by adopting the VB 6.0 and SQL Server 2000. The system benefits for separating testing from teaching and settles the problem of randomness and unrepeatability caused by manual paper generation. In this paper, some key techniques, such as system function design, the database table design, making-up strategy, Word-paper making etc. are introduced, which have very strong universal property and operability.
Topology Optimization of Frame of Aircraft Deicing Vehicle under Multiple Loading Conditions Based on Ansys
Authors: Yuan Min , Chen Chong , Jiao Ruo Bing
Published: September 2013

Firstly this article briefly describes the technology of topology optimization. Then the design space of frame of aircraft deicing vehicle is established and the model of finite element is gained by meshing. Loads and DOF constraints are applied based on the analysis of working conditions. The results of topology optimization are attained by calculation. On the basis of aforementioned results, the analysis is made. Finally, this paper makes a summary and outlook.
Study and Simulation on Turbulent Atmosphere Modeled by Gamma-Gamma Distributions
Authors: Ao Jun , Xia Yun Zhi , Che Long , Zhang Tao , Ma Chun Bo
Published: September 2013

Gamma-Gamma distribution model is widely used in studying the impact of the atmospheric turbulence on the Free Space Optical communication systems. This study introduces the Gamma-Gamma distribution model, simulates and studies the spot changes over distance, wavelength, turbulence structure constant and transmit aperture, respectively. Finally, the simulation results show that the Gamma-Gamma distribution is more suitable for middle-strong turbulence than weak turbulence.
Research on the Layout of the Chinese Tag Cloud
Authors: Zhang Yuan , Lin Yun
Published: September 2013

Tag clouds are now very popular in websites because of its ability to recruit the activity of web users into effectively information retrieval. In recent years, although there are many researches on English tag clouds, few are known about Chinese tag clouds. In this paper, we investigated the layout of the Chinese tag cloud, and analyzed eight visual features of the Chinese tag cloud according to users browsing behavior. Our results could provide a theoretical reference for the tag cloud designers.
Normal Contact Stiffness Fractal Geometric Model Based on the Gamma Distribution of Rough Joint Surface
Authors: Shen Jing Fang , Wu Ke Xiang , Yang Fei
Published: September 2013

In this article, according to WenShuHua and Zhangxueniang fractal model, we point out the deficiency. Based on the fractal theory and Zhang, Wens contact stiffness fractal model, this paper puts forward Gamma distribution of rough joint surface normal contact stiffness. This paper considers micro convex body for ellipsoid, contact area for elliptic. This is slightly convex body for sphere hypothesis is more close to the actual situation. At the same time by using statistics theory, considering the contact ellipse long, short axis a and b are greater than zero, the assumption of a and b to two-dimensional Gamma distribution, it is more suitable for engineering practice.
The Application of Multi-Objective Particle Swarm Optimization in Economic Dispatch of Power System
Authors: Zheng Peng , Jiao Wen Tan
Published: September 2013

Economic dispatch (ED) is a typical power system operation optimization problem. But it has non-smooth cost functions with equality and inequality constraints that make the problem of finding the global optimum difficult. According to the characteristics of economic dispatch problem, a improved algorithm based on particle swarm optimization for solving economic dispatch strategy is researched in this paper. Multi-objective economic\environmental dispatch demands that the pollutant emission of power plants should reach minimum while the condition of least generation cost should be satisfied. According to this demand, this multi-objective problem is solved by improved particle swarm optimization (PSO) algorithm. Using particle position and speed of change in the familiar update, the multi-objective particle swarm algorithm based on test function of this algorithm, and the simulation results of simulation optimization. The effectiveness of the proposed algorithm is verified by Simulation.
DWT Based Blind Watermark in Relational Database
Authors: Liu Yi , Wang Juan
Published: September 2013

Aiming to balance the robustness and imperceptibility of database watermark, propose a wavelet transform (DWT) based blind watermarking algorithm. The algorithm screens candidate attributes that can be embedded watermark and conducts subset segmentation and rearrangement, and then performs DWT transformation to the data subsets and the scrambled watermark image respectively. Embed the compressed low-frequency part of the watermark into the High-frequency part of the data set to achieve data fusion. Theoretical analysis and experiments show that the algorithm enjoys strong robustness and good invisibility.
An Adaptive Level Damped Algorithm Based on PINS for Ship
Authors: Yu Pei , Yang Gong Liu
Published: September 2013

The inertial navigation system error caused by sea current and log error greatly oscillates. In order to evaluate the effectiveness of damping attitude, the vehicles movement should be detected in real-time. For this reason, a novel adaptive level damped algorithm was presented in this paper. According to the characteristics of the movement of the ship, this algorithm has determined when to turn into the damp loop according to the change of acceleration. Theoretical analysis and Simulations results show that the adaptive level damped algorithm could damp most of the Schuler and Foucault oscillations period, and efficiently improve the precision of the PINS on ships.
A Novel Performance Metric of Routing Algorithm
Authors: Tang Ming Hua
Published: September 2013

The widely used routing algorithm performance metric of adaptiveness cannot precisely measure performance of routing algorithm. In this paper, we propose a new metric of routing pressure for measuring routing algorithm performance. It has higher precision of measuring routing algorithm performance than degree of adaptiveness. Performance of routing algorithm can be evaluated through routing pressure without simulation. It can explain why congestion takes place in network. In addition, where and when congestion takes place can be pointed out without simulation.
Analysis of Project Shedule Risk Indexes in PERT Network Using Monte Carlo Simulation
Authors: Liu Yuan , Wang Zhuo Fu
Published: September 2013

It is convenient and effective to use Monte Carlo simulation (MCS) technique in project schedule risk analysis and assessment, but at the same time, the indexes put forward by scholars up to now is quite few, leaving construction schedule risk assessment still difficult to carry out. Therefore, based on PERT network assumption, the shortcomings of current project schedule risk indexes are summarized and new project schedule risk index is put forward to estimate the criticality of each activity and path to provide more information for project schedule controllers. In the case studied, with the application of the new index, the critical index of each activity is given and divided into five levels, and the new index put forward in this paper shows great superiority over the classic indexes.
Research on Food Safety RFID Anti-Collision Algorithm
Authors: Niu Xiang Jie , Li Hua
Published: September 2013

As an effective way to control the quality and safety of agricultural products, traceability system is aroused growing world attention. On the purpose of retrospective quality, this paper constructs a food safety management and quality traceability system from IT view. The paper makes a detail analysis of implementation process of RFID Anti-collision algorithm. This paper produces details about the anti-collision mechanism in tags identification and proposes a dynamic frame time slot anti-collision algorithm, which fulfils the function of tags identification in system food safety quality trace.
Design Method of Database System Based on DPT and P2P Point Cloud for Internet of Things
Authors: Li Ye , Lu Bing
Published: September 2013

In recent years, with the development of Internet of Things, a new challenge is posed on data access. Focusing on the database management problems of internet of things, a design method of database system for Internet of Things was proposed by means of DPT and p2p point cloud. An example of Internet of Things for medical health system verifies the method can solve the problem of database management of Internet of Things to a certain extent and provide technical support for Internet of Things combining distributed processing technology, network technology, and middleware technology.
An Intrusion Detection Method Study under the Environment of IPv6
Authors: Wang Chao , Bin Wang , Zhang Zong Li
Published: September 2013

The intrusion detection under the environment of IPv6 is an important security technology along with firewall in system security defense system, which can be used for real-time detection and monitoring of the system in the whole process of system invasion. This paper puts forward an intrusion detection system under IPv6 platform based on intrusion detection feature attribute reduction by using pattern matching, so as to expand the range of application and user group of the security products. By the analysis and comparison of various pattern matching algorithms, the new algorithm realizes the intrusion feature module matching under IPv6, and make detection system be of high efficiency. Later experiments have proved this view.
A Simple Compact Microstrip Wideband Bandpass Filter
Authors: Xiao Jian Kang , Zhu Wu , Li Yong , Zhao Wei
Published: September 2013

Two wideband bandpass filters with miniature size and wide stopband are proposed by using cascaded U-shaped resonators. The filters exhibit bandwidths of 31.1% and 28.8% at about 5.3GHz and 5.6GHz, respectively. Both designed filters have simple structures and compact sizes, wide passband, excellent out-band performance with wide lower and upper stopbands, and a pair of transmission zeros on both sides of passband. The new designs have evident circuit size reduction compared with relative reports. A wideband microstrip BPF is fabricated and measured, and the measurement exhibits good agreement with the prediction.
A Novel Optical Network Units Source-Free Scheme Using Optical Frequency Comb Generator for OFDM-PON
Authors: Zhang Na Na , Zhou Xian , Wu Xiao Yun , Xia Li Min , Yan Dong , Long Ke Ping
Published: September 2013

The letter proposes a novel Optical Network Units (ONUs) source-free scheme for Orthogonal Frequency Division Multiple (OFDM)-based passive optical networks (PON), in which an optical frequency comb generator built by a conventional Mach-Zehnder modulator (MZM) is used to generate ultra-flat optical frequency comb spectra for the downstream and upstream transmission. The proposed architecture is presented and simulated to achieve simultaneously upstream transmission from multiple ONUs over the fiber. Simulation results show the receiver sensitivity reaches-18dBm for upstream transmission and-18.75dBm for downstream transmission.
The Research of UAV Sensors Training Virtual Laboratory
Authors: Quan Xiao Lin , Zhong Shao Chun , Lv Xue Yan , Feng Feng , Lv Xue Yi
Published: September 2013

This paper introduces the research and design of a certain type of UAV optical electronics sensors battle operation training laboratory based on VR technology. It expatiates the function and structure of the lab. The lab can solve the critical problems faced by present real UAV equipment battle education training and improve training effect distinctly. The lab also can help cadets to inquire and learn more knowledge and skill effectively.
Application of FORJ Technology in Photoelectric Tracking Equipment
Authors: Zhong Zi Jing , Wang Chun Yu , Qi Xing Long , Ren Lin
Published: September 2013

In the design of the photoelectric tracking equipment, to realize the connection between the fiber that rotates with the tracker and the fiber that fixed in the non-rotating vertical axis, The fiber optic rotary joint (FORJ) technology has been applied, which makes the optical signal be transmitted correctly under the fiber rotating status. The normal method that applying the double-channel FORJ has been introduced, based on which, a method applying single-channel FORJ and double-direction optical module has been carried out to improve the transmission quality and simplify the design structure. The insertion loss of the applied FORJ is less than 2dB and the maximum rotary speed can be up to 1000rpm. Meanwhile the design of the optic channel realizes the double-direction signal transmission with rotating movement in single route fiber. The real work shows that the signal of the equipment can be transmitted correctly.
The Information Measurement and Characterization of Polarization Coherent Light Based on Stokes Parameters
Authors: Gan Hai Yue , Huang Chun Hui
Published: September 2013

Polarization coherent optical information has a wide range of applications in information coding, communication and bioassay. Based on the characteristics of polarization coherent light, we introduced a method to measure and which were used for information coding in continuous variables coherent optical communication in this paper. Then we introduced an experimental technique for getting the information of polarized light by analysizing the intensity distribution of polarization state in polarization speckle, and how to apply this technology in the identification and analysis of biological tissues. By analysizing a Mueller matrix which is used to characterize the coherent information obtained from the measurement of the Stokes parameters, we can get some properties of biological tissues.
Signal Integrity Analysis of High-Speed Signal Connector USB3.0
Authors: Zhou Shi Lei , Guan Ya Lin , Tang Xin Kun
Published: September 2013

High-speed signal connector has become a key factor of the signal transmission quality in telecommunications and data communications system. Signal integrity of connector is an inevitable problem. This paper based on the theory of differential transmission lines and Multimode S-Parameters, analyzed the USB3.0 connector signal integrity. And use 3D simulation software CST to build model and analyze the relationship of signal integrity and connectors geometry.
The Application of RFID Technology in Development Embedded Systems
Authors: Hao Hong Qi , Song Ming Li
Published: September 2013

A complete set of RFID system is composed of two parts by Reader and Transponder grounds of the action principle Reader launch of unlimited radio waves of a specific frequency energy to Transponder, to drive Transponder circuit ID Code sent internally. Part of the embedded system software is including the operating system software (requires real-time and multi-tasking operation) and application programming. The operating system controls the application programming and hardware interaction, and the application to control the operation and behavior of the system. The paper presents the application of RFID technology in development embedded systems. The experiment shows RFID is superior to ARM in building embedded system.
Interference Excision of GPS Received Signal in Complex Environment
Authors: Zhou Zhu , Lu Shu Jun , Zhang Er Yang , Li Yao Min
Published: September 2013

Anti-jamming of GPS receiver is an important problem in navigation war, and this topic has been well researched recently. However, anti-jamming in the complex receiving environment has not been considered in the most of the researches. To solve this problem a cascade anti-jamming method is proposed in this paper. In this scheme, each channel of the received signal vector is processed by utilizing a method based on STFT, after the signal in each channel passed through the processor, a spatial processing has been employed to, suppress the reserved interferences. The results of simulations show that, it can be seen from the time-frequency spectrum before and after the first step processing that the single-tone and non-stationary interferences have been mitigated, and it demonstrates that the performance of the ideal classic Weiner filter can be achieved in the proposed method.
Relay Protection Based on Multi-Agent System
Authors: Rui Qian , Qian Su Qin
Published: September 2013

For the reliable operation of the power grid, multi-agent system is applied to multi-level relay protection to improve the fast response of the short-circuit protection. The thesis conducts the simulation concerning the conventional backup protection and the protection mode based on multi-agent system and makes performance comparison. The results prove that multi-agent system can shorten the response time effectively.
Design of Single-Ended Forward Bi-Directional DC-DC Converter Based on ARM
Authors: Yao Zhi Shu
Published: September 2013

This paper introduces a design process of a Bi-directional DC-DC converter. The main circuit uses a single-ended forward converter circuit, ARM as controller. The adoption of the synchronous rectify technique and full digital control make the whole system possess the advantages of compact structure, high conversion efficiency, easy control, reliable work and realize the energy conversion in bi-directional freely. We can verify the feasibility of the program through prototype testing.
Comparison of Design and Spatial Stability of Two Kinds of Optical Systems for Stereoscopic Mapping Camera
Authors: Tang Tian Jin , Gao Wei Jun
Published: September 2013

To achieve a certain precision when mapping in accord with a particular proportion or scale with stereo mapping camera, the change of chief ray height of the edge field due to the fluctuation of working temperature is required to be within the range of microns, and at the meantime the size and structure layout of three-linear array stereo mapping camera are determined directly by the configuration of optical system. Based on the requirements of refractive optical system with long focal length, academic calculation and actual optical designs based on two typical configurations for stereoscopic mapping camera are made,the actual working temperature and performance requirements are also taken into consideration, the results including the modulation transfer function, distortion and stability comparison are also given.
The Design of Wideband Microstrip Bandpass Filter Using Dual Stepped Impedance Stub-Loaded Resonator
Authors: Wang Yun Xiu , Zhu Lei , Zhang Song Bai
Published: September 2013

In this paper, a uniform impedance resonator (UIR) with a pair of identical stepped impedance open-circuited stubs loaded at two symmetrical positions with respect to its center is presented and analyzed for the design of a wideband micristrip bandpass filter (BPF). With compared to the conventional single open-ended stub loaded in the middle of the UIR or paired uniform stubs located at the two symmetrical position, the proposed resonator has the advantage of providing more freedom to adjust the bandwidth. Meanwhile, the two transmission zeros at both lower and higher sides of the passband ensure the filter has a good roll-off rate at the passband edge.
Electronic Structure and Optical Properties of InN: A First-Principles Study
Authors: Wang Wei Hua , Zhao Guo Zhong
Published: September 2013

The electronic properties and the optical properties of wurtzite InN are studied by the first-principles calculations based on the density functional theory. The calculations are based on the Generalized-Gradient Approximation (GGA) and implemented in Plane Wave Self-Consist Field (PWSCF). The optical properties of InN are investigated by the pseudo-potential method with PBEsol-GGA within the WIEN2K program. Band structure, density of states and dielectric functions are calculated detailedly. The energy transitions are observed and compared existing data at critical points. Moreover the new peak in between the region 12 eV to 14 eV should be due to transitions from the In-5p states to the N-2s states.
The Design and Realization of Wireless Sensor Network Gateway Node
Authors: Yuan Zhi Xiang , Cheng Jin Xiang
Published: September 2013

this paper presents the design and realization of wireless sensor network gateway nodes based on s3c2410 Processor. And introduced the design of gateway hardware and software. Also introduced the implementation method of software. A new data transmit protocol was designed to eliminate the differences between ZigBee protocol and TCP/IP protocol, and this paper also designed a data transmit management module and data communicate module. This gateway can convert the data between ZigBee wireless sensor network and internet. This gateway has a good extensibility.
Off-Axis Digital Holographic Reconstruction Based on the Spatial Filtering of the Hologram Illuminated with the Reference Wave
Authors: Xu Yan , Qiu Pei Zhen
Published: September 2013

In order to eliminate the zero-order and conjugate image in off-axis digital holography, a new method based on the spatial filtering of the hologram illuminated with the reference (written as RIh) wave is proposed. By using RIh and the low-pass filter to do the convolution operation, the real image of the object without the zero-order and conjugate image is directly obtained. Simultaneously, the real image always appears in the center of the reconstructed image plane. The spectrum characteristic of RIh is analyzed. A comparative analysis of the spectrum characteristics of the hologram and RIh is discussed. The theoretical and experiment results show that: this method requires only one hologram, and do once Fourier transform. The process of designing filtering window is simple and convenient.
Influence of Synchronous Jitter on GPS Receiving
Authors: Sun Li Cheng , Wu Zheng
Published: September 2013

Synchronous jitter is one of the factors that influence GPS receiving precision a lot. Jitter is the effective data offset off the ideal position in a data stream, which is divided into deterministic jitter and random jitter. A theoretical analysis was done to the influence of jitter. It can be seen that bit error rate gets larger due to the jitter of synchronous clock. By means of a simulation platform, a simulation was done to the synchronous jitter influence on bit error rate in the circumstance of white noise and single frequency interference. The result shows that as the synchronous jitter gets larger, the system bit error rate gets larger and the system function gets worse.
Low Voltage Low Power Up-Conversion Mixer for Wireless Sensor Networks Node Application
Authors: Sun Ge , Li Zhi Qun , Wu Chen Jian , Zhang Meng , Cao Jia , Wang Zeng Qi
Published: September 2013

A low voltage, low power up-conversion mixer is presented here for 2.4GHz wireless sensor networks (WSN). It was based on a double-balanced Gilbert cell type. The current-reuse technique was used to reduce the power consumption and negative-resistance compensation technique was used to improve the conversion gain. The mixer was designed in 0.18μm RF CMOS technology, and was simulated with Cadence SpectreRF. The simulation results indicate that the conversion gain is 6.37dB, the noise figure is 15.36dB and the input 1dB compression point is-10.3dBm, while consuming 1mA current for operating voltage at 1V.
A New Source Encoding Algorithm Based on Shannon Encoding
Authors: Shao Jun Hua , Jiang Zhan Jun
Published: September 2013

Source encoding algorithm has been widely concerned by the researchers, which aims to improve communication efficiency. In this paper, we put forward a new source encoding algorithm to decrease the redundancies between compiled code words in Shannon encoding. With the proposed algorithm, a code word is selected by considering whether the code is the prefix code of the other code words or not. The performance of the new encoding algorithm is investigated for both equal probability of source symbols and non-equal probability condition. Numerical results show that the proposed encoding algorithm can improve the encoding efficiency obviously, especially for the case of great probability differences between source symbols.
Improved Spectral Subtraction Speech Enhancement Algorithm
Authors: Liu Yu Hong , Zhou Dong Mei , Jiang Zhan Jun
Published: September 2013

The paper addresses the problems of speech distortion and residual musical noise introduced by conventional spectral subtraction (SS) method for speech enhancement. In this paper, we propose a modified SS algorithm for speech enhancement based on the masking properties of human auditory system. The algorithm computes the parameters α and β dynamically according to the masking thresholds of the critical frequency segments for each speech frame. Simulation results show that the proposed algorithm is superior to the conventional SS method, not only in the improvement of output SNR, but in the reduction of the speech distortion and residual musical noise.
Signal to Leakage and Noise Ratio Based Beamforming and User Scheduling for TD-LTE-A Systems
Authors: Wu Xuan Li , Luo Ming Xin , Sun Lun Kuan , Fu Nan Nan
Published: September 2013

In TD-LTE-A downlink, signal to leakage and noise ratio (SLNR) based beamforming can eliminate the co-channel interference and noise for multi-user MIMO mode effectively and can be realized more easily than the traditional ideal SINR based algorithms. Moreover, user scheduling can be combined with the SLNR based beamforming algorithm to obtain a better performance. Hence, in this paper, SLNR based beamforming is firstly compared with traditional beamforming algorithms, and then, a suboptimal maximum minimum SLNR (MMSLNR) scheduling strategy is proposed to improve the average BER performance and sum capacity of TD-LTE-A system and decrease the scheduling complexity as well.
Application in Data Fusion of Internet of Things Based on the KL Distance of Reputation Model
Authors: Zhu Xu Ping
Published: September 2013

The Internet of Things is a bearer network based on the Internet, the traditional telecommunications network, wireless self-organizing networks etc, so that all can be individually addressable ordinary physical objects to achieve the interconnection network. The Internet of Things is evolved from the wireless sensor network, which has limited resource in energy, memory, calculation, bandwidth and etc,. In addition, many applications in the Internet of Things are related to user privacy. In the process of data collection and transmission, the data may be forged , tampered, and a variety of other information security threats. In order to extend the network lifetime, to protect the authenticity and reliability of data fusion, this paper presents a reputation model of data fusion algorithm. The algorithm is verified by simulation, the experimental results show that the proposed algorithm is effective and the result of data aggregation is reliable.
An UWB Non-Coplanar Power Diveider
Authors: Liu Yu , Ni Ming Huan , Peng Hao , Yang Zi Qiang , Yang Tao
Published: September 2013

An improved UWB non-coplanar power divider is presented. To improve the performances of the power divider, a tapered slot and a fan-shaped slot are used in the circuit design. The simulated results show a better return loss of input port.
The Security of E-Commerce Data Transmission
Authors: Zhao Guo Fang , Yan Zhan You
Published: September 2013

The amount of data transmission in Electronic commerce (E-commerce) is growing, and the security requirements are also increasing. During the data transmission , the data transmission module is divided into four parts, They are respectively: the Internal network, isolation module, firewall and the untrust domain or external network. At the isolation module, the exchange isolation unit, data transmission unit, file transfer unit, and other units and engines, are set. The security is enhanced in e-commerce in many ways, the large flow of data transfer between different trust domains.
The Monte Carlo Method Used in Self-Switching Device
Authors: Heng Yang , Xu Kun Yuan
Published: September 2013

Optoelectronic Devices have obtained great interests for many decades. With the development of technology and in-depth research, the devices are scaled down rapidly, reaching sub-millimeter or even nanometer scale, and resulting in various new features. In recent years, a so called Self-Switching Device (SSD) which has diode-like I-V characteristics has attracted more and more attentions. Using Monte Carlo method, we have studied the electron transport in the self-switching device. Simulation results show that when the device size is smaller than the mean free path of electrons, the electron velocity is very different from that of larger device. The electron velocity and the energy become faster and higher, respectively. The reason of this phenomenon is explained by ballistic transport of electrons in the small size device. Since ballistic transport plays an important role in determining the behavior of electrons in small size device, it is need to be included in nanometer scale device modeling.
Performance Comparison of Survival Routing Mechanisms in Wireless Mesh Networks
Authors: Peng Yu Huai , Yu Yin Peng , Yu Cun Qian , Song Qing Yang , Wang Fei
Published: September 2013

This paper addresses the fault-tolerant mechanisms in Wireless mesh networks (WMNs), and designs a C++ based simulation platform to measure the performance of different fault-tolerant mechanisms. A comprehensive performance evaluation of network coding tree algorithm (NCT), 1+1 scheme and 1: N scheme in WMNs is conducted. Performance metrics, such as packet delivery ratio, resource redundancy degree, end-to-end delay, and useful throughput ratio, are investigated. The simulation results and performance analysis reveal that how wireless channel quality can influence the performance of WMNs and how different fault-tolerant mechanisms can be efficient and effective for latency-sensitive applications in WMNs. The results can also provide the enlightening insights for efficient design of fault-tolerant routing protocols for many-to-one traffic pattern in WMNs.
The Impact of Environment on the Node Coverage Modeling in Wireless Sensor Network
Authors: Pei Zhi Qiang , Xu Chang Qing , Wan Li Hong
Published: September 2013

The coverage and localization are two key issues in wireless sensor network (WSN), and they are related with the sensing model of sensors. That is, the different sensing models will lead to the different coverage patterns and localization schemes. However, the environment has a significant influence on the sensing model of sensors in some applications. Thus, this paper will study this impact and propose a sensing model, according to which, the coverage and localization will be re-studied. Finally, the simulation results demonstrate the validity of this impact, the feasibility of the sensing model, and the superiority of coverage and localization.
Numerical Simulation Ignition of Energetic Material with Femtosecond Laser
Authors: Ran Xian Wen , Tang Wen Kui , Chen Hua
Published: September 2013

Taking matchstick head as an example, the process of energetic materials ignited by lasers were numerical simulated with the smoothed particle hydrodynamics, and the numerical results of matchstick ignition time coincide well with the experimental one.
Design Location-Specific Advertising with Wireless Telecommunication Technology
Authors: Xue Jiao Long , Zou Pin Jia , Wang Jue , Fang Zheng
Published: September 2013

The heightened interest towards mobile advertising had resulted in the great concern among academic and industry circle. The literature of mobile advertising is accumulating. However, the stream of research is still in the development stage. Base on field experiment data, the developed binary logit regression model finds that distance, promotion and personalization could affect impact of advertising while using wireless telecommunication technology. The empirical results indicate that distance, promotion, personalization increase mobile application installation rate respectively, while only promotion increases mobile application installation rate.
A Set of Inverse Telecommunication Network Problems
Authors: Ding Zhe Heng , Wang Jing , Wang Qin
Published: September 2013

In this paper, we consider a set of inverse telecommunication network problem under norm. With the expansion of telecommunication network, more and more links and nodes will be added to the existed telecommunication network. The original network can not cover new nodes and some old links become useless. The telecommunication company wants to sell some old links and purchase some new links within a given budget, such that the network of the company is able to access all nodes. We consider the inverse problem by using weakly dominant set, which is to change the weights of the edges as little as possible such that the given edge set becomes a weakly dominant set under the new weights. In this paper, we propose a polynomial time algorithm for the inverse problem under norm, and we also present an example to illustrate the algorithm.
LBS System Design and Prototyping of Digital Campus
Authors: Hao Ying , Wan Shan Shan
Published: September 2013

Based on the analysis of the development of the digital campus at home and abroad, and campus LBS service status and problems of the construction and campus information needs of spatial information services is considered we research the existing digital campus architecture and proposed the overall framework based on the digital area campus LBS platform and we design center platform, mobile terminal functional structure, the establishment of a terminal positioning campus LBS platform prototype demonstration system based on digital area map query, three-dimensional browsing, navigation guides, tracking and monitoring, and SMS notification,
2-Propanol Photodegradation over Bi5AgM4O18 (M=Nb and Ta) Powders under Visible-Light Irradiation
Authors: Wang Li Ya , Li Qing , Li Xiu Kai
Published: September 2013

Bi5AgM4O18 (M=Nb and Ta) photocatalysts with 3.07-3.55eV of band gaps and layered perovskite-like structures showed activities for 2-propanol degradation in gas phase. Due to the appropriate crystal structure and energy band structure, Bi5AgNb4O18 performed much better than Bi5AgTa4O18 for 2-propanol photodegradation.
Preparation and Properties of CCTO-BCTO Ceramics with Ultrahigh Dielectric Constant
Authors: Chen La , Li Wei , Xiong Zhao Xian , Song Chun Xiao , Qiu Hong
Published: September 2013

Ceramics of (1-x)CaCu3Ti4O12-xBi2/3Cu3Ti4O12, i.e., CCTO-BCTO, with x=0, 0.01, 0.1 and 0.25, respectively, were prepared via the conventional solid-state reaction. The phase structure of the ceramics was identified by X-ray diffraction. The microstructure of the sample was observed with scanning electron microscopy. Dielectric properties and impedance spectroscopy were measured using a LCR Meter, in which 0.9CCTO-0.1BCTO displayed highest dielectric constant (584108) and lowest dielectric loss (0.42) at 1kHz among the four kinds of specimens. Based on series of experimental results, an optimum amount of x was able to improve the dielectric properties of CCTO-BCTO, through adjusting the impedance characteristics of the grain and grain boundary.
Investigation on the Solution-Based Metal-Oxide Semiconductor Film and its Properties
Authors: Li Juan , Yang Ming , Xiong Shao Zhen
Published: September 2013

In this paper, the ZrInZnO thin film has been prepared by solution method. The influence of heat treatment conditions on film properties has been analyzed. With the treatment temperature and time increase, the Hall mobility and square resistance of the film were increased and reduced respectively. In addition, we analyzed the role of heavy metal Zr on oxygen vacancies in the semiconductor oxide combined with heat treatment results and the chemical reaction process. It has been found that heavy metal Zr has binding effect on oxygen, it effectively inhibits the generation of oxygen vacancies, thereby reducing the number of oxygen vacancies, but at the same time causing certain binding effect to carriers.
Application of Carbon Fiber Composites in the Elevating Mechanism of an Unmanned Airborne Electro-Optical Platform
Authors: Wang Ping , Zhang Guo Yu , Wang Wei , Liu Jia Yan
Published: September 2013

In order to reduce the weight of the elevating mechanism, which is a component of an unmanned airborne electro-optical platform, and improve its rigidity and strength, Carbon Fiber Reinforced Polymer (CFRP) is utilized to fabricate three supporting plates of the elevating mechanism. Finite element analysis has been conducted to compare the new material CFRP with the current material: aluminum alloy. Due to excellent mechanical properties such as lower density as well as higher rigidity and strength, the new material decreases the weight of the elevating mechanism by 4.4kg, reduces the maximum deformation by 61%, and increases the natural frequency by 51%, when compared with aluminum alloy. Furthermore, the high reliability of the CFRP based elevating mechanism has been verified by vibration test and practical flight test. Because its the first time to apply carbon fiber composites on elevating mechanism of an airborne electro-optical platform, this paper not only achieves good results but also makes effective exploration for the application of new aviation materials.
Synthesis of Single-Crystal Copper Indium Gallium Diselenide (CIGS) Nanotubes Using AAO Templates
Authors: Guo Xiu Chun , Zhou Wen Hui
Published: September 2013

A facile solution method for the synthesis of single-crystal copper indium gallium diselenide (CIGS) nanotubes was developed by using anodic aluminum oxide (AAO) as morphology directing template and triethylenetetramine as both reducing agent and effective chelating agent. The crystal structure, morphology, elemental composition of the as-obtained CIGS nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The as-obtained CIGS nanotubes have a diameter about 200 nm and a thickness of 30 nm. The proposed synthesis strategy developed in this work may be used as a general process for other metal chalcogenides nanotubes and may have a bright application prospects in high efficiency, yet low cost photovoltaic areas in the future.
Research of the THz Reflectors Based on Hybrid Polymeride
Authors: Wu Jin Ke , Su Jian Po , Ma Feng Ying
Published: September 2013

Two kinds of nanoscale particles (TiO2 and ZrO2) are dispersed uniformly in PVDF (polyvinylidene fluoride) solution. The pure PVDF film, hybrid TiO2 or ZrO2:PVDF (the weight ratio of 5:5, 4:6 and 3:7, respectively) films are fabricated by spin-coating. THz time-domain spectroscopy system (THz-TDS) has been used to get the transmission spectra of the samples in THz band, from which the optical constants of the samples are extracted. The reflection spectra of the distributed bragg reflectors (DBRs) with structure of Si substrate/[HL]nH (H indicates TiO2:PVDF or ZrO2:PVDF, and L indicates pure PVDF, n=1, 2 and 3) are simulated based on transfer matrix method. The results show that from 600μm to 800μm, the reflectances of the two reflectors are both increased with the number of dielectric layers, and when n=3, the reflectivity of two reflectors at resonance wavelength are almost reaching 95%.
Experimental System for the Micro-Nanofabrication of Three-Dimensional Structures by Femtosecond Laser Two-Photon Absorption
Authors: Ren Lin , Shi Yan Li , Hao Xue , Tian Run Lan
Published: September 2013

Fundamentals of two-photon photopolymerization have been introduced and a 3D femtosecond laser micro-nanofabrication system has been built. In this paper, 3D CAD data model based on femtosecond laser micro-nanofabrication system have been also discussed. The 3D various sphere-rod photonic crystal structure mimicking real atom structures in electronic crystals have been fabricated.
Synthesis of Nickel Nanoparticles/Multiwalled Carbon Nanotubes Composites with Pre-Treated Multiwalled Carbon Nanotubes as Modifier
Authors: Guo Qiao Feng , Wang Tan , Han Chun Hua , Zhao Dong Yu
Published: September 2013

A simple synthetic route to create Nickel nanoparticles/MWCNT composites (NiNPs/MWNTs) is reported. The process is concise, no additional surfactant or other reducing gas was employed. TEM, SEM, XRD and EDX were used to examine the morphology of the nickel particles. In this experiment, the hydrothermal method using ethylene glycol as a solvent has been well dispersed, uniform size and smaller particle size of the nickel nanoparticles with average size about 50 nm. By cyclic voltammetry test results show that with good electrical properties, Ni / MCNTs.
Simplification of the Maxwell-Bloch Equation of Standing Wave Lasers
Authors: Sun Li Cheng , Wu Zheng
Published: September 2013

In order to make a numerical simulation of the chaos in standing wave lasers, a dynamic equation that is feasible to mathematical evaluation is required. There is a summation symbol in the well known Haken laser equation, and it results in a tremendously heavy quantity of evaluation. In order to simplify the evaluation, the light field in the Haken laser equation was expanded in the standing wave form. Two macroscopic variables were brought in to eliminate the summation symbol in terms of single mode and homogeneously broadening. Therefore, a simplified Maxwell-Bloch equation was gained. Then by normalizing, a new equation was obtained. This equation is in a simple form. Its every variable has unambiguous meaning and every coefficient is only related to gain or dissipation and is easy to obtain. Moreover, the equation is used in two MATLAB numerical simulations of a CO2 laser and a chaotic attractor is obtained. So the equation could be a mathematical model in numerical simulations of standing wave laser chaos.
Effect of Growth Conditions on Morphology and Photoluminescence Properties of ZnO Nanowires Fabricated by Thermal Evaporation without a Metal Catalyst
Authors: Yang Y. , Yu T. , Jin C.G. , Han Q. , Wu Z.F. , Zhuge Lan Jian , Wu Xue Mei
Published: September 2013

We demonstrate that single crystalline ZnO nanowires with large length/diameter ratio are successfully grown on Si, glass, and Si with ZnO seed layer via simple thermal vapor deposition, without introducing any catalyst or additive. In this work, we study impact of growth conditions such as growth temperature, substrates, and ZnO seed layer on morphology and photoluminescence properties of ZnO nanowires, in terms of systematic characterizations. The investigations show that the growth temperatures have substantial effect on the morphology of ZnO nanowires, while substrates have low impact. And 700 °C is believed to be the optimized growth temperature among the series of temperatures. Moreover, ZnO seed layer plays an important role in the uniformity and reproducibility of ZnO nanowires growth. PL measurements for the ZnO nanowires exhibit two emission bands including a UV emission and a blue emission, respectively. Finally, the growth behavior of the ZnO nanowires is discussed based on the VS growth mechanism. Our resluts have made a positive progress toward improving control of the morphology of ZnO nanowires.
A Remote Monitoring System of Water Injection well Based on TWACS
Authors: Zhang Miao Xin , Lu Wen Bing , Xu Ting
Published: September 2013

This paper develops a remote monitoring system of water injection well based on TWACS (Two Way Automatic Communication System), the system is comprised of remote monitoring terminal, communication master station and water injection well data back-stage management center. This system, which is based on TWACS, can realize the datas remote multi-channel parallel transmission and monitoring. Through the field experiment shows that the system has a small investment and no signal blind area, it is well suited in oilfield distribution.
Feasibility Study of Photoacoustic Imaging for Monitoring Temperature in Photothermal Therapy
Authors: Liu Yu Bin , Li Zhi Fang , Xie Wen Ming , Li Hui , Chen Wei R. , Chen Hai Yu
Published: September 2013

Photothermal therapy relies on the principle of converting light energy into heat causing localized lesion destruction. For safe and effective treatment, it is necessary to monitor temperature diffusion in the boundaries of the irradiated region, to minimize damage to surrounding normal tissues. This paper gives a pilot study of the feasibility of photoacoustic imaging for monitoring temperature changes during photothermal therapy. The results showed that our system of photoacoustic imaging (PAI) can play the role of biosensor, for the photoacoustics signal amplitude depend on temperature of tissue-mimicking phantoms. Whats more, photoacoustic signal can determinate the boundary of photoabsorder-enhance tissue during therapeutic procedure.