bluuebunny/crossref_metadata_2025 huggingface dataset:
Energy Harvesting by Foot-Propelled Battery Charger Using Shoe-Model
Authors: Verma Nishchal K. , Singla Pallavi , Roy Abhishek
Published: March 2012

This paper proposes an effective and convenient mechanism to transform and utilize bio-mechanical energy to electrical energy by presenting a self-powered shoe-model in order to tap the energy obtained for charging mobile phone battery. While walking in general, negative work is done by every human being in every single step taken. This negative work can be converted into electrical energy using a dc machine. The resulting energy could serve as ancillary source of energy for charging the batteries. The proposed self-powered shoe-model contains a permanent magnet DC machine, rack and pinion section and a signal conditioning circuit for charging mobile phone battery. The designed shoe-model has been successfully tested on Li-ion battery of a mobile phone from a reputed brand.
Research on Emergency Plan Ontology Model
Authors: Ren Min , Yang Feng
Published: March 2012

Emergency plan is a project document to guide and deal with public emergency events, and also is the core of emergency management. Nowadays, most emergency plans in China exist in non-semantic form and are difficult to play roles effectively. Ontology is an important method to describe semantic model. Therefore, in this paper, emergency plan ontology model is constructed by ontology technology of semantic Web and Web Ontology Language OWL, which formally describes the conceptions of emergency plan and the relations between them. Finally, the model is used in ontology-based semantic retrieval system, and improves the retrieval recall and precision.
Ab Initio Electronic Structure Studies of CuO Multiferroics
Authors: Kanagaraj C. , Natesan Baskaran
Published: March 2012

We have performed detailed structural, electronic and magnetic properties of high - TC multiferroic CuO using first principles density functional theory. The total energy results revealed that AFM is the most stable magnetic ground state of CuO. The DOS and electronic band structure calculations show that in the absence of on-site Coulomb interaction (U), AFM structure of CuO heads to a metallic state. However, upon incorporating U in the calculations, a band gap of 1.2 eV is recovered. Furthermore, the Born effective charges calculated on Cu does not show any anomalous character.This suggests that the polarization seen in CuO could be attributed to the spin induced AFM ordering effect.
The Analysis of Management Mechanism Innovation Research of China Art Museum in New Time
Authors: Liu Fan
Published: March 2012

The Art Museum, the city has become indispensable cultural facilities, one of their number and visibility has become a national measure of a city or even an important indicator of the level of cultural development, and represents a city or even a national historical heritage. In recent years, public arts and culture is thriving, local art galleries have expansion and reform. Art is a visual art works rely on a certain occasion displayed, to the role in people's thoughts, feelings and tastes, influence people's spiritual qualities. Art Museum of China and internationally active creative arts prosperous trends and patterns of view, there is a gap. And the Museum of Modern Art in today's world given the social attributes and functions of the embodiment of public cultural services than there is a gap. New time of global economic integration process and the development of knowledge economy, and the popularization of network technology. Museum management should be on how to change to adapt to this situation, the future will be how to develop innovation to meet environmental requirements are the contents of this study.
Study on Network Convergence Based on IMS Architecture
Authors: Wang Yu Jiao , Lin Hai Yun , Li Hai Yan
Published: March 2012

As the core technology of next generation network, IMS supplies the standards and perfect methods to lay out the new service and converge between the traditional network and telephone and mobile network. IMS also provides the operators with a set of network system and new service means. Analyzing IMS system structure and combining the features of network convergence, this paper puts forward a network convergence plan based on IMS and fixed-mobile convergence.
Design of Network Learning Platform Based on Cloud-Computation
Authors: Wang Yu Jiao , Lin Hai Yun , Rong Hui
Published: March 2012

Cloud computing is a brand new network concept after grid computing, which is the development trend of the next generation of internet. Cloud computing, as a network application mode of low costs and high performance, is gradually influencing people’s learning, work and life. Through the analysis of cloud computing and its key technology combined with the features of network learning, a network learning system model based on cloud computing is constructed, which could realize flexible expansion according to users’ requirements.
Study on Physical Education Model Construct
Authors: Miao Chun Bo
Published: March 2012

As our existing physical education more to emphasis on skills master, so that our model of physical education teaching objectives is relatively simple, thus expense of student ability, personality and emotional training. In this paper, the basic theory of physical education model as basic, analysis of trends and structure in physical education, Analysis of the curriculum theory of new physical education model , summed up China's new physical education model design, and finally introduced the subject of several typical physical education model.
Laboratory Study and Evaluation on a Novel Clearfrac Fluid System
Authors: Zhong Shuang Fei , Liu Fu Jian , Li Dong Xu
Published: March 2012

Hydraulic fracturing is an effective measure to recover the permeabilityof reservoir and important to enhance oil and gas well production and water injection well. Fracturing fluid is the key factor in the fracture treatments. At present, water-based fracturing fluids are popular, because of low costs and steady performance, which has the largest applications. However, it performs badly in residue. The novel developed clearfrac fluid system named CF1 has lowresidue, cost affectivity, prior temperature resistance properties. Evaluation through a series of lab experiments, the experiments result show that the novel clearfrac fluid system can satisfy with the requirement of low damage and have favorable temperature resistance under 120 。C. The damage to the core matrix due to with the broken frac-fluid is low. Prior properties of the novel clear-fracturing fluid are suitable to high temperature and high pressure reservoirs. It is also a novel environmental friendly viscoelastic surfactant fracturing fluid. The development of the novel clear-fracturing fluid for hydraulic fracturing industry is significant.
A Simulated Annealing with Ranking and Selection for Stochastic Optimization
Authors: Alrefaei Mahmoud H. , Diabat Ali H.
Published: March 2012

We consider the problem of stochastic optimization, where the objective function values are not available and need to be simulated to get their estimates. When the function values are available one can use the simulated annealing algorithm. In this paper, we modify an algorithm that uses the hill climbing feature of simulated annealing with fixed temperature to search the feasible solution set. The proposed algorithm uses indifference zone approach of ranking and selection method to compare the current optimal solution and the potential solution that guarantee the optimal solution with a pre specified level of confidence. The algorithm is tested on a (s, S) inventory problem and compared to other competing algorithm. The numerical results show that the proposed method outperforms the competing method and indeed locate the optimal solution quickly.
Optimization Study on Preparation of Macroporous Silicon on P-Type Silicon Substrate by Electrochemical Etching
Authors: Ou Wei Ying , Zhao Lei , Li Zhao Chen , Diao Hong Wei , Wang Wen Jing
Published: March 2012

Low cost electrochemical etching method was utilized to prepare macroporous silicon on p-type silicon substrate in dilute HF solution. By optimizing the substrate resistivity, the etching current density, and the etching time, excellent macroporous silicon was obtained on 15 Ω•cm p-type silicon substrate with the pore diameter of about 2 μm, the pore depth of about 30 μm, and the surface pore density up to ~107/cm2. Such macroporous silicon gave out an excellent antireflective performance with the reflectance lower than 4% in a wide spectral range of 400-1000 nm. The low reflectance combined with the deep pore morphology provides an attractive potential to fabricate radial p-n junction solar cells on such macroporous silicon.
Short Review: Electrophoretic Deposition (EPD) on Non-Conductive Substrate
Authors: Ab. Aziz Siti Alwani Binti , Amirnordin Shahrin Hisham , Rahman Hamimah Abdul , Abdullah Hasan Zuhudi , Taib Hariati
Published: March 2012

The application of electrophoretic deposition (EPD) technique for deposition of thick and thin film deposition has been extended not only on to electrically conducting materials but also to non-conducting material. The review encompasses the fundamental aspects of EPD technique and specific factors influencing the EPD process on non-conducting substrate. Important EPD processing parameters, during EPD on non-conducting substrate discussed are types of substrate, counter-electrode substrate and substrate additive. The parameters were discussed based on the up-to-date comprehensive overview of the current research progress in the field of EPD on non-conducting material.
Thermal Transient Measurements on High Power LEDs with Different MCPCB Substrate
Authors: Anithambigai P. , Mutharasu D.
Published: March 2012

This study elucidates the significance of thermal transient measurement based on structure function evaluation particularly on high power LEDs. The metal core printed circuit boards (MCPCBs) were redesigned with reference to the product datasheet. Aluminium nitride was employed as the dielectric material of the MCPCBs and thermal performance of copper and aluminium substrate with different substrate thickness has been reported in this paper. It was observed that the aluminium based MCPCBs performed better heat dissipation compared to the copper based MCPCBs. In addition, when two different thicknesses of the MCPCB substrates were compared, it was observed that the thicker substrate performed a lower thermal resistance compared to the thinner substrate MCPCB. The junction to board thermal resistance was determined using the standard transient dual interface method.
Comparison on the Thermo-Optical Performance of LEDs with MCPCB and FR4PCB under Various Drive Currents and Ambient Temperatures
Authors: Teeba N. , Mutharasu D.
Published: March 2012

Proper heat management is necessary for better performance of the LEDs. In the present study, the thermo-optical properties of the LED with different type of PCBs were analyzed. The measurement was done with two different testing conditions to identify the effect of increasing drive current at constant ambient temperature and increasing ambient temperature at constant drive current on the the LEDs with different PCBs. In both the conditions, the thermal behaviors of the LED are affected much due to different type of boards. As the drive current increases, the junction temperature and RthJA of the LED with MCPCB reduces around 3.7K/W and 15.3K/W compare with the LED with FR4. The change in magnitude of chromaticity coordinates of LED with FR4PCB and MCPCB calculated as 0.154 and 0.132 respectively. At a lower ambient temperature, the LEDs with FR4 and MCPCB record the RthJA as 71.2K/W and 50.6K/W respectively. However, these values were lowered around 15% at higher ambient temperatures for both the LEDs. As ambient temperature increases, the shift in chromaticity coordinates for the LEDs with MCPCB and FR4 was obtained as 0.0163 and 0.0165. The influence of the different type of PCB’s performance on LEDs was observed in the increasing drive current condition rather than the increasing ambient temperatures.
Analysis on the Efficient Limiting Factors of N-Type Rear Junction Solar Cells by PC1D Simulation
Authors: Li Hai Ling , Zhao Lei , Zhou Chun Lan , Diao Hong Wei , Wang Wen Jing
Published: March 2012

By conventional production-line process, n-type Al-doped rear junction solar cell could be easily fabricated without any other equipment and process. Since the properties of n-type silicon material are different to that of p-type silicon material and the junction is placed at the back, the process parameters should be optimized theoretically to assess the efficient potential. By modeling cells using PC1D software, the effect of some process parameters on the properties of n-type base solar cells were studied, including base resistivity, bulk lifetime, front surface field and recombination rate of front surface. The key parameters were identified and the potential industrial efficiency was calculated.
Influence of the Increasing Drive Currents and Ambient Temperatures on the Performance of Different Chip Technology LEDs
Authors: Teeba N. , Mutharasu D.
Published: March 2012

Proper heat management is necessary for better optical performance of high power light emitting diodes (LEDs). However, the thermal behavior of the LEDs differs as the chip technology changes. In this study, the InGaAlP and InGaN based amber and green LED were used to investigate the influence of different operating conditions on its thermal and optical performances. The increasing driving current affects the InGaN LED more than the InGaAlP LED. As the driving current increases, the green and amber LEDs loses its wall-plug efficiency (WPE) from 18.1 to 10% and 31.1 to 27.1% respectively. The higher drop in WPE of green LED was contributed by the higher junction temperature which rises more than 11.1°C than the amber LED. The RthJA was reduced around 4 K/W in green LED and only 1.9 K/W in the amber LED. However, the increasing ambient temperature give significant effect to the thermal behavior of the amber LED. As the ambient temperatures increases, the WPE of the amber LED reduces from 29.7 to 20.7% whereas the green LED loses its efficiency by 0.6%. By investigating the thermal and optical behaviors of the different chip LEDs under different operating conditions, the appropriate working condition of the LEDs at the optimum level can be identified.
Preparation of Colloidal Silver Nanoparticles by Laser Ablation; Evaluation and Study on its Developed Applications
Authors: Rad Adeleh Granmayeh , Abbasi Hamed
Published: March 2012

In this work we report the preparation of colloidal silver nanoparticles. In order to prepare the silver nanoparticles laser ablation method has been used.A silver coin as a target (purity 99.9 %) was ablated by a Q-Switched Nd:YAG laser with a fluence of about 91 mJ/cm2 at a repetition rate of 10 Hz at room temperature. In order to evaluate these particles transmission electron microscopy (TEM) and spectrophotometry (from UV to NIR) have been used. The average size of prepared nanoparticles is ~ 20 nm. The importance of morphology of nanoparticles has been investigated. Developed applications of silver nanoparticles have been studied,silver nanoparticles are considered as biocompatible and low in toxicity and have good potential for biological applications. Lately silver nanoparticles have found a novel approach in different fields of medicine, biology and industry.
Study on the Effect of Process Parameters on Reciprocating Wear Behavior of Components Produced by Selective Laser Sintering (SLS)
Authors: Naiju C.D. , Manoj P.K. , George Tarun Thomas , Kurian Joseph
Published: March 2012

This work presents the results of a study carried out to determine the reciprocating wear behavior and its effect on the process parameters of components manufactured by selective laser sintering (SLS). A standard procedure and specimen had been used in the present study to find the wear behavior. Using Taguchi’s experimental technique, an orthogonal array of modified L9 had been developed. Reciprocating wear testing was carried out and analysis of variance (ANOVA) technique was used to investigate the effect of process parameters and to identify the main process parameter that influences the properties of wear behavior on the SLS components. It has been found that laser power had more influence on wear as compared to other selected process parameters. Micro-structural analysis was also carried out using scanning electron microscope on the wear testing sample.
Underground Sensor Interaction Technique Based on DSP
Authors: Zhang Yan , Wang Ru Lin
Published: March 2012

In the underground data gathering and processing system, TMS320VC55X acquires signal and send it to display correctly on the LCD. The related hardware and software design of system is introduced in this paper. System adopts MzLH01-12864 display module with serial peripheral interface to realize graphic & text display. On the basis of the hardware interface circuit, SPI working mode of DSP multi-channel buffer serial port, software protocol and sequential flow are recommended. System realizes to display signal on LCD correctly, to demonstrate multiple menu of character and graphics and to implement the human-computer interaction.
Numerical Simulation of Ultrasonic Generator in Dust Removing System
Authors: Choi Hoomi , Kim Tae Sung
Published: March 2012

An ultrasonic dry cleaning system is a kind of air-blowing cleaning system, which clears away fine particles of dust adhering to a surface. This system does not require high cost consumables such as highly pure gases or chemical solvents. Moreover it removes micro contaminant particles without additional cooling or heating processes. In this paper, a numerical simulation of the ultrasonic dry cleaning system was carried out to propose an optimum ultrasonic generator. We evaluated the flow in the chamber according to the groove shape of ultrasonic generator, and system operating pressure using a commercial fluid dynamic simulation tool. And the trend of the sound pressure level (SPL) according to frequency was checked to determine whether or not the ultrasonic generator module could generate an ultrasonic wave. The particle trajectories were compared for several conditions and particle sizes. We confirmed that an ultrasonic wave of sufficient flow velocity can be generated through the ultrasonic generator module. And the changes of SPL according to the system operating pressure and the shape of the ultrasonic generator groove were confirmed respectively.
Design and Fabrication of a Micro-Actuator Based on Electromagnetic Membrane Device
Authors: Ma Rong Hua , Zhong Jian Hao
Published: March 2012

The purpose of this study is to develop a micro electro-magnetic actuator manufactured by MEMS-based fabrication and electroplating techniques. This actuator presented a novel technique in the electromagnetic fabrication and smaller physical size than the traditional counterparts for micro actuators and provides a faster response time and lower cost. A micro coil structure is released from FeCl3 etchant and bonded on a thin film (Parafilm”M”, Pechiney Plastic Packaging Inc.) to achieve an actuator-membrane structure. When an external AC power is applied to a micro coil, a magnetic field is created to attract and repel through an NdFeB permanent magnet, and the displacement of the membrane is increased as a current of AC power. The results show the measured magnetic field intensity weakens as the distance between the coil and the Gauss meter probe increases. However, it is observed that the magnetic field intensity does not increase linearly with the number of series coils, which is due to the distance between series coils.
Effect of Joining Process on the Coatings of Self-Piercing Rivets
Authors: Esfahani Mahsa , Durandet Yvonne , Wang James , Wong Yat Choy
Published: March 2012

In this study, effects of laser assisted self-pierce riveting (LSPR) as a mechanical joining technique were investigated on the coatings of self- piercing rivets. Zn-Sn and Al plated rivets were used to join magnesium sheets by LSPR. Microstructure, surface topography and roughness of the rivet’s coatings were characterized by optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and surface profilometry. A comparison of results before and after joining process showed that under joining conditions, Zn-Sn coating was deformed during riveting process and its thickness and microstructure varied along the rivet shank, while Al coating remained unchanged and no effects of riveting process was detected.
Preparation of LLDPE/Modified Silica Nanoparticle with Triethoxyvinylsilane Film for Microwaveable Packaging
Authors: Pradittham Arjaree , Trejitwattanaku Supapen , Sramanee Titima , Thanakkasaranee Sarinthip , Atong Duangduen , Pechyen Chiravoot
Published: March 2012

Nanocomposite films based on liner low density polyethylene (LLDPE), containing of 1 phr silica nanoparticle and 1, 3 and 5 %wt triethoxyvinylsilane as a new coupling were prepared and characterized using FTIR tests, scanning electron microscopy, tensile tests, oxygen and water vapor permeation measurements. Optimization of the technology involved in production of an exfoliated nanocompound is a complex process in which multiple variables and parameters are involved. The results of the study showed that the feed position of the nanoparticle in the double screw extruder is of vital importance in obtaining an exfoliated film. The maximum triethoxyvinylsilane used in the extruder was 3 %wt, for LLDPE/modified silica nanoparticle. There was no exfoliation or intercalation of the silica particle in the absence of triethoxyvinylsilane. The oxygen barrier properties of the LLDPE/modified silica nanoparticle film were significantly better than those of the LDPE/silica nanoparticle film. In addition to barrier properties, the LLDPE/silica/3%TEVS film also had better Young’s modulus and tensile strength than their counterparts without triethoxyvinylsilane.
Luminous Exposures and Light-Fastness Survey in Daylit Historical Museum Galleries under Tropical Sky Conditions
Authors: Ahmad Noraini , Ahmad Sabarinah Sh , Talib Anuar
Published: March 2012

This paper highlights the results of light levels and light-fastness study conducted in four daylit historical museum galleries in Malaysia. These museums architectural features allow sun radiation into the building, causing light exposure damage to artifacts. This study aims to evaluate the luminous exposures and light-fastness as an initial preventive conservation measure in daylit historical museum galleries under the tropical sky conditions. Light sensors with data-loggers and Light-fastness dosimeters were installed throughout the museums to take cumulative light exposure measurements during museum opening hours. Both instrumentations were tested in the field during different campaigns exposures. After exposures between 90 and 100 days, these dosimeters showed photo-induced colour changes which translated exposures into equivalent luminous exposure and estimated annual exposures (Lux hours) which were used to validate the measured values of illuminance data. Simulated light dosimeters and measured illuminance data show good correlation. Thus, equivalent light dosimeter makes sense to assess the impact of light distributions.
Electrical Resistivity Based Non-Destructive Testing Method for Determination of Soil’s Strength Properties
Authors: Siddiqui Fahad Irfan , Osman Syed Baharom Azahar Bin Syed
Published: March 2012

Precise determination of engineering properties of soil is essential for proper design and successful construction of any structure. The conventional methods for determination of engineering properties are invasive, costly and time-consuming. Electrical resistivity survey is an attractive tool for delineating subsurface properties without soil disturbance. Reliable correlations between electrical resistivity and other soil properties will enable us to characterize the subsurface soil without borehole sampling. This paper presents the preliminary results of an ongoing research on correlations of electrical resistivity with strength properties of soil. Soil investigations, field electrical resistivity survey (VES) and laboratory electrical resistivity measurements were conducted. From the data analysis, significant correlations have been obtained between resistivity and moisture content and angle of internal friction. Weaker correlations have been observed for cohesion and unit weight of soil.
Utilization of Mass and Elastic Loading in Oxide Materials Based SAW Devices for the Detection of Mustard Gas Simulant
Authors: Raj V Bhasker , Singh Harpreet , Nimal A. Theodore , Sharma M.U. , Tomar Monika , Gupta Vinay
Published: March 2012

The properties (mass loading and elastic changes) of different oxide materials (ZnO, TeO2, SnO2, TiO2) in thin film form has been explored for the enhanced detection of DBS (di butyl sulphide), a simulant of sulphur mustard gas. All the four oxide materials are deposited on to the surface of SAW (Surface Acoustic Wave) devices to impart sensitivity and selectivity. ZnO and SnO2 films are crystalline whereas TiO2 and TeO2 films are amorphous in nature. All the films are transparent with transparency greater than 75 % in the visible region. The SAW devices coated with different oxide materials were placed in the feedback loop of colpitt oscillator. With the exposure of DBS vapors, differential frequency increases for TiO2 thin films whereas for other oxide coatings (ZnO, TeO2 and SnO2) it decreases. ZnO coated SAW sensor is found to be maximum sensitive to DBS vapors. Investigation of sensing mechanism revealed that mass loading effect is pronounced in TiO2 thin film whereas for other films change in elasticity is dominant. The oxide coatings are very less sensitive to the other interferants.
Efficient Domain Search for Fractal Image Compression Using Feature Extraction Technique
Authors: Baviskar Amol G. , Pawale S. S.
Published: March 2012

Fractal image compression is a lossy compression technique developed in the early 1990s. It makes use of the local self-similarity property existing in an image and finds a contractive mapping affine transformation (fractal transform) T, such that the fixed point of T is close to the given image in a suitable metric. It has generated much interest due to its promise of high compression ratios with good decompression quality. Image encoding based on fractal block-coding method relies on assumption that image redundancy can be efficiently exploited through block-self transformability. It has shown promise in producing high fidelity, resolution independent images. The low complexity of decoding process also suggested use in real time applications. The high encoding time, in combination with patents on technology have unfortunately discouraged results. In this paper, we have proposed efficient domain search technique using feature extraction for the encoding of fractal image which reduces encoding-decoding time and proposed technique improves quality of compressed image.
Degradation of Butylparaben by Ozonation and UV/TiO2 Processes
Authors: Chuang Li Chin , Luo Chin Hsiang , Chuang Ming Chieh , Wang Miao Chi
Published: March 2012

Butylparaben is widely used as a bactericide and as an antimicrobial agent in the formation of personal care products (PCPs). Owing to a certain estrogenic activity, a possible relationship with breast cancer has been proved by many researchers. The removal efficiency of butylparaben in aqueous solutions was studied using advanced oxidation processes (AOPs). These results indicate that the reaction rates for the ozonation of butylparaben in water are higher under the concentration of ozone 5 mg/L in alkaline condition. The original concentration of butylparaben almost degraded within 50, 30, and 20 min at ozone concentrations of 1, 3, and 5 mg/L, respectively at pH 11 runs. The ozonation imposed butylparaben with a time dependence that appeared to follow pseudo first-order kinetics. The original butylparaben was degraded 50 %, 40%, 35%, and 32% within 24 hr at pH 3, 6, 9, and 11 respectively by UV/TiO2 process in the O2-sparged concentration of 30 mg/L. The rate constants are 0.045, 0.043, 0.025, and 0.020 hr-1 at the butylparaben concentrations of 10.30, 20.60, 30.90, and 41.20 μM, respectively.
Problems and Countermeasures of the Development of English Majors in Provincial Higher Institutions in China
Authors: Guo Yin Ling
Published: March 2012

English major students in China’s provincial higher institutions are facing a very fierce employment situation. In order to improve the students’ quality and their competitiveness of getting a job, we investigated the curriculum and cultivation modes for English majors, the teaching and learning conditions of twenty three provincial colleges and universities of Henan Province in China. On the basis of investigation and analysis of the existing problems, this paper puts forward some countermeasures. Colleges and universities of different types and at different levels should have different English majors training modes in order to have their own outstanding features. Inter-disciplinary English talents can be cultivated by paying attention to students' integrated English language competence and humanistic quality by strengthening English teachers’ training and inter-university cooperation and by innovating the English major undergraduates’ cultivation methods.
The Security Experience of Wireless Local Area Network at Ningbo University
Authors: Ding Ai Xia , Dan Wang
Published: March 2012

The network revolution has dramatically changed the way individuals communicate and conduct business. In the whole network system, WLAN is the most easily linked to the users. The diversity of WLAN communication makes it faced with various information security threats. This paper provides necessary and sufficient conditions for wireless network to lead to an increased security level. Concerns for WLAN security and confidentiality in a university environment were expressed in the paper. A number of recommendations are provided to initiate and promote WLAN security. The contribution of this paper is divided into three parts. Firstly, it introduces the overall network and the WLAN of Ningbo University in general. Secondly, it analyzes different WLAN protocol defects and the information security threats and attacks known in the campus LAN. Thirdly, it provides WLAN communication security precautions and the strategies adopted by our university for solution from the aspects of technique and management respectively.
The Urban Appraisal Research of the Chain Enterprises on the Basic of the AHP Theory
Authors: Chen Jun , Tang De Shan
Published: March 2012

The urban appraisal is the foundation of the chain enterprises’ successful sitting strategy, which greatly reflects the enterprise’ competitive power and the orientation of expansion strategy. This paper aims to study the problem of city selection of the chain enterprise. First of all, it uses the cluster analytic method to classicize the city, and then through establishes the city evaluation model, carries on sorting using the analytic hierarchy process to the similar city. Finally, it makes the empirical analysis to the six cities in Jiangsu Province. At last it establishes the model of urban evaluation which is based on the AHP theory to solve the problem of sitting of the retail chain enterprises, which has important theoretical significance in guiding how the chain enterprises expand and choose a new region orderly.
A Combined Method for Concentric Circles Detection in Image of O-Shape Rubber Ring
Authors: Yue Gong He , Lu Chang Hua , Sheng Liu Qing , Liu Yu Na
Published: March 2012

Traditional Hough transform (HT) methods based on parameters decomposition do not give good result for concentric circle detection, for the reasons of its large amount of calculations, high demand of storage space and low efficiency in real-time application. To compensate the weaknesses, this paper employs a kind of improved Hough transform method which aims at reducing the parameters space. In this paper, the detection method is further improved through adding an edge detection procedure based on global threshold. The experimental results show that this algorithm meets the on-line detection of high accuracy requirement, with superior real-time performance and stronger anti-interference ability.
Inspection Manpower Planning for X & S Control Charts
Authors: Yang Wen An , Liao Wen He , Guo Yu
Published: March 2012

A method of determining the optimal number of inspectors and/or working time required on a specific SPC activity is presented in the study. The issue of inspection manpower planning is handled as a constrained optimization problem. The optimization strategy is not only to minimize the avoidable surplus quality loss due to failure of detecting the out-of-control states but to determine the cost of inspection manpower from the perspective of deploying an appropriate amount of inspection manpower in a cost-effective manner, and meanwhile the values of sample size, sampling interval and control limits of control charts are also determined. The result obtained indicates that the total cost (or loss) can be substantially reduced if implementing control charts was equipped with adequate inspection manpower.
Steady State Response Simulation of a 2-D Micromirror in Simulink
Authors: Skulavik Tomas , Schreiber Peter , Moravčik Oliver
Published: March 2012

Micromirrors fabricated by MEMS technology may be important sensing components in optical tracking systems used in many industrial applications. This paper deals with the analytical model of a 2-D gimbal mounted micromirror and with the simulation of a steady state response of the micromirror in Simulink. The model of a 2-D micromirror should be further used in a simulation of its dynamical behavior.
An Empirical Examination of Fit between Supply Chain Integration and Environmental Uncertainty
Authors: Chen Yue Yang , Huang Hui Ling , Tsai Ming Chi , Liang Je Ruei
Published: March 2012

Nowadays, in a dramatically changing marketplace, the integration of all of the resources in a supply chain has been regarded as an important issue for firms. However, in this complex network relationship, which links among firms, lots of uncertain factors could affect the performance of a supply chain. Thus, a structural fit model is needed to address the relationship between supply chain integration (SCI) and environmental uncertainty (EU). Empirical data for hypothesis testing are collected from top-ranked companies in Taiwan. The results show that fit specifically has a positive direct effect on supply chain performance.
ACO-Based Global Optimal Transportation Path
Authors: Zhu Wei Hua , Shen Ying
Published: March 2012

This paper discusses how to address some issues when contemplating the global optimal transportation path (GOTP) such as dynamics, the ability of real-time analysis as well as complexity of prediction. Using shortest path methodology, this paper abstracts the real-life problem to a graphic context. Based on the solution of ant colony optimization (ACO) algorithm, the simulation indicates that this manner is efficient and effective in dealing with these problems. The indicators utilized ACO are achieved through simulation results analysis, providing the range of exact elements.
Research on Information Security Model
Authors: Hu Yu Juan , Meng Qing Wei
Published: March 2012

Security of computer information system more and more aroused people’s attention, and information security assessment and computer system security model is closely related to information security model which is patricularly important. This article describes the security model of the characteristics and uses, and several security models are compared, these models were from a different perspective considering system security, through comparison Analysis, Establishment of information security model obtained several important aspects to consider.
Formation Mechanism of Ceria Particles by Spray Pyrolysis
Authors: Shih Shao Ju , Huang Jian Pu , Chou Yu Jen
Published: March 2012

Ceria-based materials are widely used in industrial applications such as catalyst supports, catalysts and electrolytes. Various applications require different morphological particles. Spray pyrolysis (SP) is a well-known process for ceria particle fabrication because SP has the advantages of simple and continuous process. Although various studies have discussed the particle morphology formation of SP, some questions are still unclear. In order to solve these questions, this study investigates the morphology of ceria particles from various precursors using SP. By combining the experimental data of scanning electron microscopy, transmission electron microscopy and focused ion beam, the result suggests that the particle formation mechanism is highly correlated with factors of hydrophilic-hydrophobic properties of precursors. Therefore, the morphology mechanism of SP for the ceria particles is proposed .
Computation of Availability and Performance of Wind Turbine with Markov Analysis in India
Authors: Selwyn T Sunder , Kesavan R.
Published: March 2012

This paper deals with the availability analysis for the wind turbines (WT) located in hill and main pass having uncertainty in wind. Availability is a key performance index for WTs. In this paper, the concept of Markov analysis (MA) is used to model the failure characteristics of the WTs for calculating probability and reliability of reaching various system states of WT having the capacities of 225 kW, 250 kW, and 400 kW. Due to uncertainty in the wind, the probability of component failure is independent of the past history. Hence MA is considered as the best mathematical tool for modelling WT with complex system. The field data obtained from the Muppandal site in India such as Mean time between failure (MTBF), Mean time to repair (MTTR), failure rate and repair rate are used to compute the WT availability, using ITEM Toolkit version 8.0.2 as a measure of performance. No attempt is made to analyze the individual state of the WT system. In this paper, for seven critical components, a resultant of 128 states has been analyzed. This analysis yields some surprising results that some WTs are the most unreliable due to the rapid failure of its sub assemblies in view of the very high uncertainty in the wind and frequent grid failures.
Comparison of Heuristics for Identical Parallel Machine Scheduling
Authors: Behera Dhiren Kumar , Laha Dipak
Published: March 2012

This paper addresses the problem of scheduling n independent jobs processed nonpreemtively on m identical parallel machines with the objective of minimizing makespan. Since these scheduling problems are well known to be NP-hard, among various solution methodologies, heuristics are preferred most. They guarantee near-optimal solutions and due to their polynomial time algorithms require reasonable computational effort, especially for solving large problem sizes. We consider three popular heuristics, multifit, combine and listfit since the seminal work of McNaughton in 1959. We present different experimental frameworks to investigate these heuristics for a comprehensive comparative performance evaluation. We show, through computational experimentation, that listfit outperforms the multifit and combine heuristics in most of the problem instances, however, at the cost of increased time complexity. The computational results also reveal that the combine heuristic performs better than the multifit heuristic, while requiring almost similar computational effort.
A Weighted Fracturing Fluid System for Deep Well Stimulation Treatment
Authors: Zhu Qi , Zhong Shuang Fei , Liu Fu Jian
Published: March 2012

Petroleum industry is focusing on high-pressure and high-temperature (HPHT) reservoir. The major problem facing to HPHT reservoir is to generate enough bottomhole pressure without exceeding the limitations of equipment on the ground. In order to overcome these problems, weighted fracturing fluid system has been developed whose density can reach up to 1.50 g/cm3. This paper summarizes a study on formulating sodium bromide and sodium chloride as a combined weighted agent and a delayed crosslinked fracturing fluid system which is to cater the fluid and treatment guidelines for the fracturing application. Extensive studies were also conducted to determine temperature stability and anti-shear properties and gel broken.
Research on the Smart Home System Based on IOT
Authors: She Ming Hong , Yang Hong Bing , She Ming Ying
Published: March 2012

With the rapid development of information technology, people’s daily life becomes more and more dependent on it. Yet traditional controlling algorithm is too rough to satisfy the requirement of living convenience. To overcome this shortcoming, the technology of IOT is introduced to the control process of smart home. The structure and working process are described in detail. The intelligent controlling algorithm based on D-S Evidence theory is introduced and the simulation experiment for lighting control is described, the result has perfectly validate the validity of the algorithm described.
Design of Tactile Sensor for Measuring Orthocenter Deviation and Friction in Wafer Transmission Process
Authors: Wu Jiang , Liu Yan Jie , Han Hai Jun , Sun Li Ning
Published: March 2012

In order to raise position accuracy and stability in wafer transmission process, a tactile sensing system which can measure both deviation of wafer to manipulator and friction acting on wafer simultaneously is introduced. Analysis on kinetic model abstracted from sensing system is made, and following algorithms are applied: micro displacement is calculated through pressure values acting on different sensing units, and meanwhile friction is calculated from relative velocity between permanent magnet and inductance. Through simulation, indicators of sensing unit are established. This sensing system has the capacity of detecting deviation ranging 0-5 mm with resolution 0.05 mm and measure friction ranging 0-0.64 N. The results indicate that this sensing system meets the requirements in orthocenter deviation and friction measurement in wafer transmission process.
Theoretical and Experimental Researches Regarding the Performances of a New Type of Rotating Machine with Profiled Rotors
Authors: Băran Nicolae , Duminică Despina , Besnea Daniel , Detzortzis Antonios
Published: March 2012

The paper establishes an original computation formula for the flow rate of the fluid transported by a new type of rotating machine with profiled rotors; the theoretical characteristic diagram of the machine - flow rate versus machine speed - is built. The scheme of the test stand used for performing measurements needed in order to build the experimental diagram is presented. The variation of the volumetric efficiency of the working machine in function of the machine speed is finally described.
Investigation for Spool Sluggishness and Jamming of Hydraulic Proportional Remote Control Valve
Authors: Wang Zhao Qiang , Gu Lin Yi
Published: March 2012

In order to solve the spool sluggishness and jamming problem of a hydraulic proportional remote control valve that is encountered in the course of research and development for this valve. All the possible channels resulted in spool sluggishness and jamming are analyzed, and we should find the relative reasons from hydraulic spool sluggishness and jamming and mechanical spool sluggishness and jamming respectively. Through the relative improvement on the spool and experiment, the probability of spool sluggishness and jamming would be reduced largely.
A New Model Reference Adaptive Control Using Stacked Identifiers
Authors: Chung Wei Der , Hu Xiao , Na Woon Ki , Chen Hsin Pei , Cheng Yun Zhi , Wang C.C.
Published: March 2012

Model reference adaptive control is a major design method for controlling plants with uncertain parameters. The primary objective of this paper is to develop a new design approach for the model reference adaptive control of a single-input single-output linear time-invariant plant. The proposed method, called the “Model reference adaptive control using stacked identifiers, “uses a stacked identifier structure that is new to the field of adaptive control. The goal is to make the output of the plant asymptotically track the output of the first identifier, and then driving the output of the first identifier to track that of the second identifier, and so forth, up to the q-th identifier where q is the relative degree of the plant. Lastly, the output of the q-th identifier is forced to converge to that of the reference model. Simulation results shown our paper provides a new adaptive scheme which may give a better transient performance. No state measurement of the plant is required in our method. Since the resulting control systems are nonlinear and time-varying, the stability analysis of the overall system plays a central role in developing the theory.
Application of Wavelet Thresholding Filter to Improve Multi-Step Ahead Prediction Model for Hydraulic System
Authors: Safehian Javad , Akbarzadeh Alireza , Imani Behnam Motakef
Published: March 2012

Proper operation of a hydraulic system used in a fatigue test machine (FTM) is crucial. This is because a fatigue test may take well over hours and is not necessarily supervised. Any system failure may result in specimen destruction or experiment failure. In this study experimental data is collected and analyzed to prognoses the hydraulic system. Prognosis may be used to set an alarm level when the predicted values of failure fall within the warning region. This paper presents an approach to predict the operating conditions of a hydraulic system a few increments ahead in time, otherwise known as multi-step ahead (MS). The approach is further validated using experimental data. To do this, applied force on standard aluminum specimen is recorded in time series. Wavelet soft thresholding is used to filter and reduce the effect of noise and sharp edges in the measured applied force data (time series). Embedding dimension and time delay are determined using Cao's method and auto mutual information (AMI) technique, respectively. These values are subsequently utilized as inputs for constructing prediction models to forecast the future values of the machines’ operating conditions. The results show that the neural network (NN) prediction model can track the change in machine conditions and has the potential to be used as a machine fault prognosis tool.
Fuel Cost Optimization of Power Systems Inclouding HVDC Line
Authors: Abdi Babak , Alimardani Arash , Ghasemi Reza
Published: March 2012

Effect of HVDC transmission lines in a power system on different optimal power flow (OPF) objective functions is discussed in this paper. In this study differential evolution optimization algorithm is applied in AC-DC OPF problem, and compared with OPF in the same power system with no HVDC transmission lines to demonstrate the effect of this type of transmission line on the objective functions. In OPF problem definition, generator fuel cost considering valve effect is considered as objective function. The results of the proposed method on IEEE 30-bus power system illustrate that HVDC transmission lines improves the OPF from fuel cost point of view.
Observer-Based State Tracking Adaptive Controller for a Class of Non-Affine Nonlinear Systems: An Intelligent Approach
Authors: Ghasemi R. , Menhaj M.B. , Abdi B.
Published: March 2012

This paper proposes a new method for designing both nonlinear observer and adaptive controller for a class of non-affine nonlinear systems with unknown functions of the system. The states of the nonlinear system are assumed to be unavailable for measurement. The merits of this paper is as: asymptotic convergence of the observer and tracking error to zero, boundedness of all signals involved, and robustness. The simulation results illustrate the promising performance of the proposed algorithm.