bluuebunny/crossref_metadata_2025 huggingface dataset:
Growth of ZnO Nanostructures at Different Reactant Concentrations for Inverted Organic Solar Cell
Authors: Yap Chi Chin , Abu Bakar Ainu , Yahaya Muhammad , Salleh Muhamad Mat
Published: July 2012

The effects of reactant concentration on the growth of ZnO nanostructures and the photovoltaic performance of inverted organic solar cells based on a blend of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV) as donor and (6,6)-phenyl-C61 butyric acid methyl ester (PCBM) as acceptor with a structure of FTO/ZnO nanostructures/MEHPPV:PCBM/Ag utilizing ZnO nanostructures as electron collecting layer and silver as a hole collecting electrode were investigated. The ZnO preparation consisted of ZnO nanoparticles seed layer coating and followed by ZnO nanostructures growth in equimolar aqueous solution of zinc nitrate hexahydrate (0.02-0.08 M) and hexamethylenetetramine (0.02-0.08 M). ZnO nanorods having diameter of 50-70 nm and with length up to 120 nm were obtained at reactant concentration of 0.04 M. The ZnO nanorods started to merge with each other and formed irregular nanostructures vertically on the substrates at higher reactant concentrations of 0.06 M and 0.08 M. The solar cell with ZnO nanorods prepared at reactant concentration of 0.04 M provided the largest interface area between polymer active layer and ZnO, resulting in the highest power conversion efficiency of 0.053 % with short circuit current density of 0.43 mA/cm2, open circuit voltage of 0.42 V and fill factor of 29 %.
Study of Iodine Influence in Synthesizing ZnO Nanoparticles via Precipitation of Zn – Ethanol Reaction
Authors: Johan Ooi M.D. , Abdul Aziz A. , Abdullah M.J.
Published: July 2012

The morphology and physical properties of ZnO nanoparticles are greatly influenced by the way it is synthesized. In this work, we study the influence of iodine ion in Zn- Ethanol reaction as this ion is believes to have the ability to control the nucleation and growth of ZnO particles [1]. The morphology of ZnO particles in the presence of iodine shows nearly spherical in shape (size ~ 110 nm) whereas ZnO particles without the presence of iodine exhibit hollow microsphere with feeler like structure growth outward of the sphere . Photoluminescence (PL) spectra shows a broad UV emission peak for both of the sample where sample with the absence of iodine possess lower intensity of UV emission centered at 380 nm compared to samples with iodine which demonstrates stronger intensity at 390 nm despite of having very weak visible secondary emission peak at 530 nm. Iodine contribution to ZnO morphology, structural and optical properties was discussed where iodine has shown to have more controlled on the formation and nucleation of ZnO particles.
The Governance of Sintering Regimes on the Properties and Ageing Resistance of Y-TZP Ceramic
Authors: Sivanesan Sivakumar , Singh Ramesh , Leong Chin Kong
Published: July 2012

The retention of nanometric microstructures is a challenge in any presureless sintering process. Grain size influences mechanical properties and grain coarsening retards densification upon sintering, thus resulting in the poor overall product properties. Hence, it is important to select, among others a suitable sintering regime which promotes densification and retards microstructure coarsening. In this work, Y-TZP ceramic bodies were fabricated under four different sintering regimes to investigate the governance of conventional Single-Stage Sintering (SSS) with 1 min and 2 h dwell time, and comparing their performance with bodies produced by Two-Stage Sintering (TSS). It was revealed that TSS sintered samples, yielded better properties than the SSS samples sintered at 1400°C with a dwell time of 2 hours. In the hydrothermal ageing test, TSS samples did not undergo the low-temperature degradation via the martensitic phase transformation of tetragonal to monoclinic symmetry. Nevertheless, it was found by XRD analysis that Y-TZP ceramics sintered by the SSS method using a short dwell time of 1 minute was effective in maintaining the tetragonal phase stability after 50 hours of exposure in superheated steam conditions.
Fabrication and Structural and Optical Characterizations of GaN Nano and Micro Structures Grown by Thermal Evaporation Method
Authors: Shekari Leila , Haslan Abu Hassan , Zainuriah Hassan
Published: July 2012

Abstract. Gallium Nitride (GaN) nano and micro structures were grown on different substrates, such as ceramic boat and alumina plate using thermal evaporation method with commercial GaN powder under the flow of Argon (Ar) gas atmosphere. Micro structural studies by scanning electron microscopy (SEM) revealed the role of different substrates in the nucleation of the GaN nano and micro wires and ribbons. Additional structural and optical characterizations were performed using energy-dispersive X-ray spectroscopy (EDX) and photoluminescence (PL) spectroscopy. Results indicated that the nanowires and nanoribbons are of single-crystal hexagonal GaN and are more and less orderly in their growth with different substrates. The quality of growth of the GaN nanowires and nanoribbons for different substrates is highly dependent on the lattice mismatch between the nanowires and their substrates and it also depends on the conditions of the growth.
The Effects of Temperature of Hydrothermal Growth of Titanium Dioxide Nanomaterial
Authors: Kalantar Mastan Ahmad Anis , Norani Muti Mohamed , Ahmedullah Sharizal Shaik
Published: July 2012

Titanium dioxide (titania) nanomaterials have been extensively studied for various applications including gas sensor [1], dye-sensitized solar cell [2] and photocatalyst [3]. Titania nanomaterials can be produced using various methods depending on the desired surface morphology. As such the optimization of methods is the key to produce nanomaterials with desired properties where the study here focuses on the effect of autoclaving temperature for the hydrothermal growth. Titania P25 (Degussa, Germany) in 5 M sodium hydroxide solution (NaOH) was treated hydrothermally for 24 hours at 100 °C, 120 °C, 150 °C and 170 °C. Hydrothermal treatment for 24 hours at 150 °C produced nanotubes and treatment at 170 °C produces nanowires. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and X-ray Diffraction (XRD) were performed to study the surface and internal morphology of nanomaterials formed. Nanowires produced are of average width of 20 nm and length of 200 nm to 1 µm. Nanotubes produced are average width of 25 nm consisting of multiple walls. Varying the autoclaving temperature will affect the surface morphology of nanomaterials; forming nanotubes at 150 °C and nanowires at 170 °C. Understanding the effect of the process temperature would allow for optimization of the process in order to produce titania nanomaterial with specific characteristics that exhibit enhanced functionality for the development of their applications.
Research of Hybrid Scheduling Based on Network Calculus in Coal Mine Ethernet
Authors: Kang Xiao Feng , Hu Kun
Published: July 2012

According to the characteristics of data in coalmine industrial Ethernet ring networks and in order to guarantee the demand of the real-time data in it, a hybrid scheduling method with non-preemptive priority and EDF scheduling method based on the IEEE802.1p protocol is proposed in the switch. We calculate the maximum transmitting delay of the real-time data using network calculus theory. The result shows that EDF decreases transmission delay for non-periodic data better than FCFS by theoretical computation and simulation.
Research on the Space Manipulator Control in Capturing Object Based on Noncontact Impedance Control
Authors: Chen Zhi Gang , Wu Cui Ru , Zhang Guang Yu
Published: July 2012

This paper discusses the control of free flying space manipulators in the impact process which happens in the capturing operation. To solve the intense coupling of the kinematics and dynamics between the space manipulator and the base, this paper builds the noncontact impedance control model of the 6-joint space manipulator system, which can control the space manipulator before impacting with the objects. Computer simulations are performed to verify that the noncontact impedance control method can make the end-effector of the space manipulator keep desired dynamic characteristics and the adjustment of virtual impedance parameters can control the impact force value efficiently.
Alternating Stress Dynamics Analysis of Harmonic Gear Flexible Wheel
Authors: Han Xue Feng , Bai Yang , Li Ming , Jia Hong Guang
Published: July 2012

This article is the study of alternating stress of flexible wheel in harmonic gear drive system. Firstly, according to elasticity theory to theoretically analyze flexible wheel stress; then, based on the basic principle of sub-structure modal synthesis method , use the software of UG、PATRAN and ADAMS to carry out co-simulation; Finally, based on the dynamics simulation, to analyze the alternating stress simulation results of flexible wheel and compare theoretical results and simulation results to come conclusion. The results show that: altering stress simulation results of flexible wheel are coincident with theoretical simulation results, have a deeper understand the stress change trend in the drive process of flexible wheel, lay a foundation for further carrying out dynamics simulation of harmonic gear drive system.
The Application of MEMS Gyroscope in Stable Platform of Infrared Guidance
Authors: Ren Ya Fei , Ge Yun Wang , Bai Xu Can
Published: July 2012

In recent years, Gyro stabilized and tracking platform has been widely used in the guidance, airborne, ship-borne, the military area and civil area such as the weapon, missile seeker, sensing detection, public security fire control, environmental monitoring. In order to improve line of sight stabilization precision of the Infrared Guidance equipment to ensure the stability of the seeker pinpoint the maneuvering target, we do some researches about the essential technologies in the stability and precision of gyro. This paper developed a set of new stable platform used of MEMS gyro device based on the infrared detection system, in view of the zero shift stability for MEMS gyro, with the key technologies for the gyro signal analysis and processing of theoretical research and experiment.
Guaranteed Cost Control for a Class of Switched Descriptor Systems
Authors: Zhao Chun Yuan , Shi Shu Hui
Published: July 2012

This paper deals with the problem of guaranteed cost control for a class of switched descriptor systems. State feedback guaranteed cost controller is adopted to make the resulting closed-loop system stable and cost function have an upper bound. Based on single Lyapunov function and convex combination technique, a switching law is designed and a sufficient condition of the existence of such controller is presented. By means of variables substitution and linear matrix inequality, the condition can be turned to LMI. The advantage of method presented in this paper is illustrated by an example.
Study on the Communication Mechanism of Two-Grade CAN Based Marine Distributed Control System
Authors: Zhao Hou Kuan , Zhang Xin Fu , Guo Kui , Huang Hai Bo
Published: July 2012

On the basis of a two-grade CAN-based marine distributed control system, this paper made an in-depth study on principles of making application layer protocol for CAN communication, communication approaches, redundancy switch, and fault diagnosis as well, and has achieved good results in practical application.
Adaptive Modified Projective Synchronization Between Genesio and Rossler Chaotic Systems with Uncertainties
Authors: Du Li Ming , Wang Feng Ying , Liu Ji Fei , Pan Rui
Published: July 2012

The paper discusses the modified projective synchronization of two different chaotic systems by nonlinear control laws, considering the conditions of the master-slave systems with uncertain parameters, the synchronization problem between Genesio system and Rossler system has been investigated, adopting the adaptive control method, a sufficient condition is attainted for the modified projective synchronization between master and slave system, finally, The control performances are verified by the numerical examples.
Design of Mobile Robotic Control System Based on ARM
Authors: Xiao Hong Xiang , Lei Ya Ping
Published: July 2012

In this paper, the embedded control system of mobile robot was designed by using the LPC2114 as processor, the function hardware module block diagrams were provided, and analyzed the algorithm of testing speed part of system and motor drive part; the system with the high precision sonic sensor module can avoid the obstacles, which can enhance the security performance of system, the modules for wireless communication and friendly human-machine interfaces make convenient for the use of customers and the developing and debugging of the system.
Research on a Novel Non Dead-Time Compensation Two-Phase Modulation SVPWM Control Strategy
Authors: Liu Bao Lian , Jin De Fei
Published: July 2012

A space vector pulse-width modulation (SVPWM) strategy was developed to solve the failure of traditional SVPWM. A two-phase modulation method is adopted basing on the analyses of traditional SVPWM to select the null switching state in each sector according to the power factor angle. As a result, when the current is crossing zero, the corresponding phase does not commute and dead-time compensation is avoided; and when the current is nearing the peak, the corresponding phase also don’t commute, which leads to lower switching losses. The simulation and experimental results validate that the proposed strategy can effectively improve the current wave, minimize the current distortion and reduce the switching losses. Furthermore, the algorithm is easy to implement.
A Secure Routing Protocol Based on Certificateless Signcryption for Satellite Networks
Authors: Yu Zhe Fu , Zhou Hai Gang , Wu Zhao Feng
Published: July 2012

The article introduces a certificateless signcryption scheme targeting the problem of lacking of security mechanism in the routing of satellite networks, and designs a secure routing protocol suitable for the satellite networks. The proposed protocol avoids complicated management in the certificate mechanism and bypasses the key escrow problem in the identity-based cryptography using the certificateless cryptography and signcryption. The analysis shows that the new protocol can resist several common attacks, effectively improve the security of the satellite networks routing.
Based on the BP Neural Network of Logistics Equipment Support Capability Evaluation
Authors: Hao Jian Sheng , Huang Qi Zhi , Li Shu Dong
Published: July 2012

In this paper, the system engineering theory research logistical equipment safeguard ability assessment method, and established the equipment support of the evaluation index system, using BP neural network can to approximate any nonlinear system advantage, based on the BP neural network of logistics equipment support capability evaluation model for logistics equipment safeguard the ability to provide a new method. The simulation results show that this method can ensure objectivity.
Application of SS-MVPN Technology in Mobile Network
Authors: Hang Qiang Wei , Chen Bing , Hou Qiang
Published: July 2012

More and more people are using mobile equipments to access business resources from the organization's internal network, how to ensure the data security in the data transport process of mobile intelligent terminals is becoming an urgent need to address issues. This paper proposes a new solution of mobile VPN which using the SSL to protect the data flow and SOCKS5 proxy technology to redirect flow, and gives the analysis of its performance improvement principles.
Numerical Simulation and Test Study on Non-Preheating Welding Technology of HSLA Q550 Applied to Hydraulic Structures
Authors: Yang Hui , Wang Jing Ling , Hao Yong Fei
Published: July 2012

In this paper, weld stress field of Non-preheating with t-joint weld process of high strength low alloy steel Q550 is simulated applying the coupling analysis of temperature and stress field in finite element method(FEM) software ANSYS. The research proves that weld joins can achieve equal strength with the base metal using low alloy high strength steel flux-cored welding wire PK-YJ707A of low hydrogen slag type system. Impact absorbing energy comes up with 107J at -20°C and comes up with 80J at -40°C. After the results of bending, the weld joins have no crack or smaller than 3mm. The mechanical property meets the requirements of the HSLA Q550. In addition, the simulation result is able to more accurately predict the welding stress field that can provide theoretical basis for guiding production practices, reducing cost and improving working environment.
Taint Graph of System Call Arguments for Intrusion Detection in Mobile Intelatrac
Authors: Nie Dan , Wang Yu Hui
Published: July 2012

The intended data-flow in a vulnerable program is subject to be subverted by attacks which exploit buffer overflows or format string vulnerabilities to write data to unintended location. In Mobile Telecommunication it is especially important on data safety. These attacks can be classified into two types: control-flow-attacks exploit buffer overflows or other vulnerabilities to overwrite a return address, a function pointer, or some other piece of control-data; non-control-data attacks exploit similar vulnerabilities to overwrite security critical data without subverting the intended control-flow in the program. The control-flow attacks are well studied and widely used, so there are several typical approaches to prevent them, which monitor the sequence of system calls emitted by the application being monitored and utilize control-flow information of the system calls for intrusion detection. However, the non-control-data attacks are rare for the reason that they rely on specific semantics of the target applications, and there are only few works that defend them to some extent. In order to prevent non-control-data attacks, we leverage dynamic taint technique to track the instruction level relationship between different system call arguments and construct taint graph which can represent behavior profile of a benign program in this paper..
WLAN Authentication Scheme Based on Message-Recovery RSA-PSS
Authors: Liu Jia , Shen Yu Li
Published: July 2012

In this paper, a wireless local area network (WLAN) authentication scheme is proposed to both enhance the security and the working efficiency of the network. The authentication sever (AS) and the mobile terminals are properly configured with different workloads of signature generations and signature verifications. We propose using the RSA-PSS-MR scheme and the improved ElGamal scheme. Firstly, the Recovery features of the RSA-PSS-MR scheme have reduced the communication bandwidth sharply since the public keys are not necessary to transmit in our scheme. Secondly, the asymmetry calculation of signature generations and verifications of the improved ElGamal scheme can be well used to configure the scheme. The proposed scheme resolves the real-time transmission problem of authentication.
Distributed Groundwater Level Remote Centralized Monitoring and Warning System
Authors: Zhao Zhi Wei
Published: July 2012

The overexploitation of groundwater has caused many serious hydrological geological disasters in the world wide. In order to solve this subject, a groundwater level monitoring system which adopts C/S architecture design and is composed of a monitoring center, transmission network and monitoring terminals is proposed. The monitoring center is made up of a computer with professional monitoring software. The monitoring terminals are arranged at different area as required, and access Internet to transmit data to remote monitoring center server through GPRS net work. The monitoring center server is responsible for receiving, processing, storage, display and analysis the data about groundwater from monitoring terminals. The experimental results show that the system is stable, high precision, stability and timeliness of features, and realizes the automatic collection and centralized management of groundwater monitoring data that provides a reliable scientific basis for sustainable utilization development of groundwater resources and geological hazards forecasting.
The Research of Network Transmission Security Control Model
Authors: Wu Ke He , Ding Tao
Published: July 2012

Aiming to the security control for data transmission between networks with different security levels, this paper establishes a security model that adapts to the different security level networks for data transmission control, designs the network transmission control technical architecture based on the model, and achieves the safety requirements of transmission control.
Government Performance Assessment Based on BP Neural Network
Authors: Liu Hai Ping , Chen Zhi Jun
Published: July 2012

Improvement of government performance is always the fundamental goals and the fundamental value that the public administration pursues. Proceed from the special duality identity of government, this paper designs an index system on government performance. And then predicts the quantitative assessment of government performance based on BP neural network in order to build a forward-looking quantitative assessment system. The accuracy and effectiveness of the system is verified by experiments.
Study on Synchronization Acquisition in Ultra Wideband Communication
Authors: Feng Nuan , Chen Yong
Published: July 2012

In the light of synchronization acquisition of receiving technology, this paper propose a two-step solution which is energy detection and synchronization search to achieve acquisition quickly. First, use energy detection to narrow the searching area, then to search. This method can overcome the complexity of receiver algorithm occurred during the previous designations and improve the synchronization acquisition speed at the same time and finally to obtain fast synchronous acquisition. The experimental results show the feasibility of the synchronization algorithm, which has great improvement compared with the existing algorithms and can balance the complexity and synchronization performance and ensure the synchronization accuracy in conditions of certain signal to noise ratio.
Reasearch on Movements of Grading Steel Balls in Mill by Discrete Element Method
Authors: Zhou Ping , Du Jing Hong , Duan Xi Xiang
Published: July 2012

Based on Discrete Element Method(DEM), movements of steel balls in ball mill were simulated by Particle Flow Code in three Dimensions (PFC 3D), the motion states of all steel balls and balls with one diameter were discussed respectively at different ball filling rate. The results indicated that steel balls moved from cascading motion gradually to throwing motion with the increasing of rotary speed rate, and became centrifugal motion after rotary speed rate exceeded certain value. When rotary speed rate unchanged, the translation speeds from cascading to throwing or from throwing to centrifugal motion accelerated as steel balls’ diameter decreased. The segregation of steel balls was more obvious with the rising of rotary speed rate and lead to steel balls’ lamination that big balls moved in the inner and small balls moved in outer layer of the mill. Lamination of steel balls is benefical to crush different size minerals and improve grinding efficiency.
Resource Scheduling Method Based on the Tenants' Requirements of QoS
Authors: Chen Ting Wei , Wu Ji Hong
Published: July 2012

Multi-tenancy technology in SaaS (Software as a Service), the basis of the shared resources on how to meet quality of service requirements of different tenants, is a major problem faced by the resource scheduling. Solve the problem, proposed a resource scheduling method based on the tenants' requirements of QoS: resources classified by types of resources QoS value of the keywords the two indexes to the formation of the three resource pool structure, in order to improve the speed of resource scheduling; division of tenants rating to determine the order of execution of the request, types of resources required, the division of tenants request for the sub-request, according to the sub-requested quality of service levels ,respectively, using different resource scheduling strategy, the isolation of different quality of service requirements of tenants. The experiments show that the method can achieve the tenants' quality of service requirements, and has a higher efficiency.
Self-Adapted Admission Control Model for Parlay on Heterogeneous Network
Authors: Zhou Hao , Wang Jun Ping , He Suo Ju
Published: July 2012

Parlay Gateway has played an important role in application development on heterogeneous networks. For many third part’s applications accessing Telecommunication Network through it, it is likely to become the bottleneck of whole system. In this paper, the author proposed a self-adapted control model which is effective in admission control of Parlay Gateway. This method is made up of five modules, which are admission control module, waiting queue module, token generating module, scheduling module, and the overload detecting module. According to some simulation results, the author found it is useful and easy to be implemented.
Design of Crop Environmental Monitoring System Based on ZigBee
Authors: Liu Ze Liang , Liang Ning Li
Published: July 2012

A large number of sensors have been used in the system to form a monitoring network through ZigBee protocol. The system can obtain the information through these sensors, and according to the information the position in question will be accurately located. The sensors connect to the monitoring network through a wireless module, and upload monitoring information in real time. The gateway is responsible for receiving the wireless sensor nodes to data storage, display and management, to achieve all base test point access to information, management, dynamic display and analysis and processing. This information will be display to the user with charts and text prompt manner in the monitoring software and it provides a variety of sound and light alarm information and message alarm information.
Service-Oriented Network Performance Management Based on FDAHP
Authors: Mao Wei Na , Li Xing Ming , Wu Jian
Published: July 2012

Traditional network management takes network equipment as main management objects, while the network services may failed even if the network devices work well. As a matter of fact, users concern more about the operating states of network services. Considering from users’ perception, this paper proposes a service-oriented network performance management model constructed by the Fuzzy Delphi Analytical Hierarchy Process (FDAHP), which focus on mapping service performance parameters into network performance parameters that can help us deeply understand root faults in communication networks. Simulations and experiments are carried out to prove the validity& correctness of our method.
Testing Technology of Tether Net System Based on Simulation
Authors: Xie Lian Bao , Lin Qi
Published: July 2012

Performance testing and evaluation of system of systems has always been a challenge. In this paper, on the base of analyzing and concluding the traditional testing technology of tether net system, a method of tether net system testing based on simulation is posed. Discuss the conception, target, principle of system testing, the basic configuration and supporting technology of tether net system simulation environment are presented, and finally build virtual test bed environment , finish testing.
Based on VPN Tunnel Technology of Wireless Local Area Network
Authors: Luo Zhen Jun , Zhang Ying Jiang , Qin Juan
Published: July 2012

This paper analyzes the wireless local area network existing safety and efficiency problem. It put forward the VPN tunnel technology to solve these problems. Theory explains that it is very the advantages of layer second tunneling protocol in a wireless local area network. This technology is proved to be reliable by Network Simulate 2 tool. It is proved that the technique is the advantage of high efficiency and safety.
Study on Initial States of Steel Balls in Mill by Discrete Element Method
Authors: Zhou Ping , Du Jing Hong , Duan Xi Xiang
Published: July 2012

Based on Discrete Element Method(DEM), initial state models of steel balls were establisheded by Particle Flow Code in three Dimensions (PFC 3D), the initial void rate of steel balls at different filling rate were calculated. The results showed that at the same filling rate, the initial void rate of steel balls decreased as steel ball’s diameter decreased. The initial void rate of steel balls with one diameter and grading steel balls both increased gradully as ball filling rate increased, but the initial void rate of grading steel balls were smaller than that of steel balls with one diameter. The Stratification phenomenon will occur after steel balls in grading scheme reached to the initial equilibrium sates, that is, Large steel balls moved near the mill’s center, but small steel balls moved away from the mill’s center and close to the cylinder of mill, which is benifical to improve grinding effeciency.
Fermat Point Based Joint Routing in Dual-Aggregation-Points Inter-Backup M2M Communications
Authors: Wei Yun Kai , Li Wei Qiao , Mao Yu Ming , Leng Su Peng , Yu Qin
Published: July 2012

Machine-to-machine (M2M) communications can be widely used in military probing, disasters monitoring, etc., where have rigorous environment and require reliable communications. In order to provide enough reliability, M2M subnet can be deployed with two inter-backup aggregation points. This paper proposed a novel routing algorithm named Fermat Point based Joint Routing (FPJR) for such dual-aggregation-points inter-backup M2M Communications. Taking nodes on Fermat Points as route anchors, FPJR forms joint routes which can decrease energy cost and improve communication efficiency greatly. Further, considering the probability is quite little that there is exactly a node deployed on an appointed Fermat Point, we proposed a new terminology ‘ -Fermat Region’, which denotes the circle area with the Fermat Point as center and as radius. Based on -Fermat Region and through the FPJR interaction protocol, FPJR can act not only separately but also as the aid of other routing algorithms, without any compatibility problem. The simulation results show that FPJR can greatly decrease packet lost ratio, energy cost and packet delay.
Complexity Analysis of Public Transportation Network in Zhangjiagang City Using Complex Network Theory
Authors: Wang Yong , Zhou Ta
Published: July 2012

Public transportation network has been proven that it can be simulated as a complex network. In this paper, a bus transport system of Zhangjiagang city is considered. Network degree distribution, average path length, and clustering coefficient are utilized as criteria to analyze as the complexity of the network. Experimental results show that the network which is in line with power-law distribution has a smaller average path length and a large clustering coefficient. It also indicates that, the networks of Zhangjiagang public bus system are not a small-world network with scale-free property.
A Study of Modeling Mobile Ad-Hoc Networks Attacks
Authors: Chen Juan , Shan Hong , Ma Tao
Published: July 2012

Mobile ad-hoc networks (MANETs) are especially vulnerable to attacks because of lacking infrastructure and data transfer using radio communication. In the past various types of MANET attacks have been detected and analyzed. This paper presents the enhanced attack trees for MANET attacks, which is completed by extending the basic attack trees. The enhanced attack trees add the types between nodes and the attributes of nodes. Finally this paper shows how to represent the Block hole attacks in MANETs by means of the enhanced attack trees.
VHF Channel Planning and Solve the Problem of Minimum Numbers of Relay Stations Distribution
Authors: Cui Kun Peng , Chu Guang Lin , Zhao Yang Chun , Zheng Jin
Published: July 2012

This paper aims to study VHF channel planning and solve the problem of minimum numbers of relay stations distribution, and to provide distribution of relay stations which different users can communicate at the same time by method of geometry and the building the optimized mathematical model of stations distribution.
A Web Service for Content-Based Management
Authors: Ren Yong
Published: July 2012

Rapid development of Internet technique and electronic commerce change the way of operation and management in enterprises and organizations, of which information storage systems will be affected greatly. Researchers are now more and more interested in finding a way to access information effect and efficient. We design and implement a web content management system which allows content creators to create, submit and manage contents conveniently. In our web content management system, data can be defined as documents, movies, pictures, phone numbers, scientific data, and so forth. We analyze the destination and function of web content management system first, and then design how files are organized and managed. In web content management system, the content is stored and managed at the sub-document or component level for greater content reuse. With web content management system, users can maintain security, manage objects, manage servers, and manage auditing easily.
Evaluating Artistic Voice of Singing Objectivly Using BPNN
Authors: Li Xiao Wu , Ouyang Hong Bo
Published: July 2012

In this paper, an objective way to evaluate artistic voice of singing is discussed. The model transforms artistic voice evaluation indicators into qualified data as BP network input and takes fuzzy synthetic evaluation results as output. The authors take F1(the first Formant), F3(the third Formant), vocal range, perturbation of F1, perturbation of F3 and average energy as the evaluating parameters and assess the quality of singing voices with BPNN(back propagation neural network). The results are then compared with the subjective evaluation of experienced professionals. Experiments show that BP neural network is effective to evaluate the singing voices, thus to be helpful to scientific guidance of selecting and training the talent of artistic voice.
The Research of Identity Management Services and its Key Devices for Mobile Internet
Authors: Yan Ze Ming , Yang Ming Hui , Zou Xiang
Published: July 2012

This paper presents an eID based solution to use for mobile internet, namely a platform structure and some key devices to realize the solution, in order to bring us an approach more secure and convenience to access online banking services and avoids some privacy leaking and online banking fishing problems.
Derivation and Simulation on the Academic Profile of the Mecanum Wheel
Authors: Xie Ya , Kang Shao Hua , Wang Ai Rong , Yang Cheng Yu
Published: July 2012

Mecanum wheel can provide a Omni-directional movement, so to design the academic profile of the Mecanum Wheel become the first problem to be solved. this paper make a projection of the Mecanum wheel to the set of planes that perpendicular to the wheel axes, Derivate the academic profile of the wheel. Use the data to build the model of the wheels. Then import the model to ADAMS to validate the equation we got. The simulation results indicate they have a good Omni-directional mobile performance.
Semi-Preemptible Range Lock in Parallel Network File System (pNFS)
Authors: Huo Qiu Yan , Zhang Yu
Published: July 2012

Distributed file systems use file lock mechanism to ensure consistency when the shared data are accessed by multiple nodes. In this paper, using the feature of distributed systems that the same file would be accessed frequently and the advantage of high concurrency of range lock, the semi-preemptible range lock for pNFS is proposed. Clients locally cache the finer-grained locks for ranges of files they hold. Clients retain or cache range locks even without the file instances. When an access lock is cached, a client answers some requests without a server message, improving performance by exploiting locality. Simulation results indicate that the proposed locking mechanism can effectively increase concurrency and decrease the communication cost of pNFS.
Study of the Improvement of Fixed Telephone Based on the CAS
Authors: Lei Hai Dong
Published: July 2012

In this paper, based on the traditional fixed telephony features to increase the short message processing module. To meet the voice communication between users, the fixed telephone can realize mutual development between the SMS function .The main telephone lines in the completion of the CAS signal detection, and traditional communications in FSK and DTMF signal reception and transmission.
Joint Design of Ranging and Media Access Control in Underwater Acoustic Networks
Authors: Zou Zhe Guang , Xu Xiao Mei , Tao Yi , Zhu Zhao Tong
Published: July 2012

Due to the unique characteristics of underwater acoustic channels, most wireless protocols need necessary modifications before being applied to underwater acoustic networks. In order to match underwater environment better and achieve higher performance, underwater acoustic networks are calling for cross-layer design with integrated functions implementing. This paper discusses about how to integrate the ranging technique and media access control (MAC) together. Ranging plays a key role in forming a network topology. However, the independent ranging process in an underwater acoustic network requires frequently media access and affects the performance of MAC protocols. In this paper, a joint design of ranging and MAC was proposed to solve the problem. MAC signals are reused to estimate the range. By applying ranging solutions for Aloha and MACAW, good range estimation was obtained in underwater networks. An undersea experiment was carried out to verify this solution. The experimental results show that the joint design of ranging and MAC is capable to work well in underwater acoustic networks.
Distributed Network Topology Management in Network Coding
Authors: He Ming , Chen Lin , Wang Hong , Gong Zheng Hu
Published: July 2012

In this research, we focus on distributed network management in network coding. Web Services Distributed Management (WSDM) is one of the industry standards for distributed management. With the advantage of WSDM, we improve the efficiency of topology management in network coding and propose Distributed Topology Management System (DTMS). Under the campus network as our experimental environment, we analyze the performance of our system in this paper. Further, we compare the performance of our system with AdventNet Web NMS which is one of popular network management tools. Our work is the first solution to distributed network management in network coding. It is also the first to introduce WSDM specification to network coding. WSDM brings us a loosely coupling topology management system which is user-friendly and performs well.
A Novel Wireless Sensor Network Model Based on Complex Network Theory
Authors: Xiao Wen Hong , Cai Xiang Dong
Published: July 2012

The key issue of wireless sensor networks is to balance the energy costs of the entire network, to enhance the robustness of the entire sensor network. Sensor networks as a special kind of complex network, in particular, environmental constraints, and more from the traditional complex networks, such as Internet networks, ecological networks, social networks, is to introduce a way of wireless sensor networks way of complex networks theory and analytical method, the key lies in, which is a successful model of complex network theory and analysis methods, more suitable for the application of wireless sensor networks, in order to achieve certain characteristics of some wireless sensor networks to optimize the network. Considering multi-hop transmission of sensor network, this paper has proposed a maximum restriction on the communication radius of each sensor node; in order to improve the efficiency of energy consumption and maintain the sparsely of the entire network, this paper has also added a minimum restriction on the communication radius of each sensor node to the improved model; to balance the energy consumption of the entire network, The simulation results show that proposed improvements to the entire network more robust to random failure and energy costs are more balanced and reasonable. This is more applicable to wireless sensor networks.
Lightweight Data Synchronization Scheme in Heterogeneous Sensor Networks
Authors: Cao Yu Xi
Published: July 2012

Data synchronization is critical for many sensor network operations including collaborative sensing, sensor scheduling and data fusion. Currently, large number of synchronization schemes have been proposed for the sensor network under the assumption that sensors work with the same network structure, network protocol and radio module. These techniques cannot survive in the heterogeneous sensor networks with the development of internet of things. In this paper, we propose a lightweight data synchronization scheme with low power which consists of two phases: first, we propose a heterogeneous clock synchronization algorithm based on the gateway which can synchronize the multi-hop sensor network with the TCP/IP network immediately without introducing amount of communication overhead; then, we also propose a synchronization control scheme in the gateway and we can balance the synchronization requirements through the adaptive buffer management. We implement the proposed scheme in real heterogeneous sensor network platform, and the experiment results show that our scheme can achieve high synchronization accuracy.
The Video Monitoring System Based on ARM
Authors: Liu Rui , Wang Yue Ming , Zhang Yan
Published: July 2012

In this paper, a comparison by several kinds of video surveillance technology, highlights the superiority of video monitoring system based on the embedded system. Video monitoring system is a collection of computer technology, the communication technology and digital video technology in an integrated system. Established a video monitoring system based on embedded technology, detailed analysis its system structure and gives its hardware and software design.
Simulation Analysis of the Satellite-Network Routing Algorithms
Authors: Lin Qi , Li Zhi
Published: July 2012

A simulation test methodology has been developed to evaluate Satellite-Network Routing Algorithms. The test technique simulates problems routing algorithms encounter in satellite network by selecting the routing strategies which take minimal hop, minimal delay, and minimal transmitting power as principles and addressing them from building a satellite network simulation scenario in which the simulation test approach is applied and recording their performances in the form of statistical summaries.
Study on Plating Bath Preparation Method of Novel Nano-Composite Plating
Authors: Xia Zhen Sheng , Zhang Ben Sheng , Zhao De Yao
Published: July 2012

This article studies plating bath preparation method of novel nano-composite plating technology to improve properties of coatings when repairing the wear of equipments surface with the application of composite plating technology. The Nanoparticles of plating bath use Al2O3, metal substrates use Fe-based nano-composite plating coatings of Fe. The liquids ingredients of plating bath are prepared with ferric chloride and hydrochloric acid. The experiments of mechanical properties indicate that this plating method is an advanced technology on repairing the surface wear, which can effectively enhance the coatings properties of hardness, strength and wear resistance, which especially is suitable for the restoration to the wear of the high accuracy metal components of important equipments
Experimental Study of Long-Range Shallow Water Acoustic Communication Based on OFDM-Modem
Authors: Qiao Gang , Liu Song Zuo , Zhou Feng , Sun Zong Xin
Published: July 2012

In this paper, we focus on the need for remote and robust underwater acoustic(UWA) communication in shallow sea. A set of OFDM underwater acoustic communication algorithm is designed including the techniques of Doppler estimation and compensation, channel equalization and frequency diversity. This algorithm is realized in the DSP and successfully applied on the OFDM-Modem platform. In Da- Lian shallow sea trial, the horizontal communication distance is 36 kilometers under the condition of QPSK modulation, 1/2 rate convolution code, bandwidth between 4 and 8kHz. The communication rate of the OFDM-Modem can reach 426bps and the ultimate BER is less than 10-3.
High-Precision Timing System Based on Microcontroller
Authors: Cao Rui
Published: July 2012

The task of timing system is countdown on a set date and showing the time from current date to the setting date to enhance people’s attention and sense of urgency. A kind of high-precision timing system is introduced. The system is controlled by single-chip microcontroller. High integration clock chip is used as clock module. System hardware design and software design are introduced. System hardware design includes design of clock module, its connection with single-chip microcomputer, and the design of display module. System software design includes the settings of single-chip serial port, its initialization, the reading and writing of the clock module, the countdown program and the display program. Compared with other timing system which consists of frequency demultiplication by multivibrator, this system is more stable and reliable. The accumulative error is zero when long-time running continuously. Because the system control module is simple, it is convenient to be developed and utilized. Practice shows that this high-precision timing system can meet practical needs well.
A Concurrent Transmission Scheme for in Heterogeneous Wireless Network
Authors: Wu Xiao Bo , Mao Yu Ming , Wu Fan , Yu Qin , Leng Su Peng
Published: July 2012

Integration of the wireless LANs (WLAN) and 3G networks, such as Universal Mobile Telecommunication Service (UMTS), has been intensively studied recently due to their complementary characteristics. In this paper, we design and implement a flexible protocol stack architecture which can support concurrent transmission via multiple radio interfaces. Furthermore, the multiple services with various QoS requirements are differentiated and transported in the best wireless access network which is determined by the proposed network selection criterion-- Multi-Criteria Decision Making (MCDM), in the heterogeneous wireless network. Simulation results demonstrate that the proposed concurrent transmission scheme improves the network utility and provide the QoS services among the multiple wireless access networks more efficiently.
Software Design of the Track State Inspection System Based on LabVIEW
Authors: An Xiao Xue , Chai Xiao Dong , Zhu Wen Fa , Xu Xiao Wei
Published: July 2012

This paper describes the software of the track state inspection system based on LABVIEW, which includes serial communication, data extraction, strap-down algorithm, acceleration integral and saving the results. Serial communication module uses VISA to program in order to realize communication between the IMU (inertial measurement unit)and upper computer. According to the output data format, data extraction module separates the signal of three axes’ accelerations and angular-rates by Match Pattern Function. Strap-down algorithm and acceleration integral modules are programmed by Math Script. The measurement results are saved by Write to Spreadsheet File Function. Finally, it’s to design a convenient humanized operation interface.