bluuebunny/crossref_metadata_2025 huggingface dataset:
A New System for Measuring Bridge Deflections Based on Laser Imaging Process
Authors: Cui Fang , Wang Yun Fei
Published: December 2011

A new system for measuring bridge deflections based on laser imaging process is introduced. Firstly, principle of this system is analyzed with geometrical optics theory. Secondly, hardwares of measuring system are illuminated in detail, and the key software problems are discussed, including laser spot center location and accurate control of motorized TV zoom lens. The laser spot center location is realized by using image fuzzy edge extraction algorithm and Hough transform algorithm. The accurate control of motorized TV zoom lens' motors is realized by using a control-driving card based on ISA bus. At last, the contrastive experiments are operated on a certain continuous steel bridge with this system and dial test indicator. The experimental results show that this system is equal precision with dial test indicator, and can get over defects of traditional measuring methods. The security and reliability is much higher relatively and the precision can match to the engineering requirement.
Analytical Model of 12-Pulse AC-DC Converter Based on Switch Function
Authors: Gao Lei , Tong Wei Ming , Meng Fan Gang
Published: December 2011

This paper proposes a frequency domain method to analyze the harmonics components of input current and ripple coefficients of output voltage in 12-pulse diode rectifier system. Based on frequency domain linearity and analysis of commutation, the dc side output voltage and input line current are divided into two segments, and then expressions of the input current and output voltage are obtained. Some simulation results about THD, power factor and ripple coefficient are shown to validate the correctness of the proposed method
The Development of E-Learning System for Fractal Big Tree Graphics Based on Iterated Function System
Authors: You Fu Cheng , Chen Yu Jie
Published: December 2011

The traditional method to introduce the design of big tree fractal graphics is to give fixed graphics in black color. In this paper, a new learning environment of triangle fractal graphics based on E-Learning is proposed, development of which is also introduced in detail. In this new learning environment, students can repeat drawing the colorful big tree fractal graphics with single color or random color, which may arouse the students' interests and attract their attentions. By the learning environment, the fractal limitation or fixed point can be seen, and two different kinds of big tree can be got when the IFS code is changed, which will do benefit to students' learning concepts of fractal graphics. By this new learning environment, it is very easy for students to grasp the programming procedure of fractal graphics, and understand the generation procedure and structure of triangle fractal graphics.
The Common Methods of Analysis and Diagnosis on Electromagnetic Compatibility
Authors: Lin Rong , Liu Zhi Gang
Published: December 2011

This paper lays the emphasis on the common methods of analysis and diagnosis on electromagnetic compatibility . Firstly it introduces the significance of fault diagnosis on electromagnetic compatibility, and then introduce methods of fault diagnosis and detection technique of fault signal. Finally, the common methods of analysis and judgment was summarized.
Strip Rolling Mill Random Vibration Analysis Based on Pseudo-Excitation Method
Authors: Xu Bao Yu , Wang Xu Dong , Liu Yi Lun , Feng Hai Chao
Published: December 2011

The five-octave mill stochastic dynamics model was established, and then constructed the virtual rolling force excitation, converted random excitation into the rolling force deterministic harmonic excitation by taking advantage of pseudo-excitation method, finally the variance and power spectral density dynamic random changes in the roll gap was Obtained . The results show that the emergence degree of rolled-strip oscillation marks is proportional to random rolling force power spectral density, and in over the five-octave frequency, the roll gap’s dynamic variance no longer change.
Inverse Kinematics Analysis of 5-DOF Robot Manipulators Based on Virtual Joint Method
Authors: Liu Zhi Zhong , Liu Hong Yi , Luo Zhong
Published: December 2011

To solve the inverse kinematics problem of a robot manipulator without closed form solutions, one-dimensional iterative method is very useful. However, for a 5-DOF robot manipulator, because of the uncontrolable and uncertain orientation vectors, it's difficult to analytically express all joint variables by one of them, therefore one-dimensional iterative method can not be directedly used. By adding an appropriate virtual joint to it, a 5-DOF manipulator can be changed into a 6-DOF one so that the uncertain orientation vectors can be pre-given, and the difficulty is solved. To illustrate this virtual joint method a 5-DOF serial robot manipulator with prismatic arm joint and offset wrist is discussed in this paper as an example.
The Design of FIRA Based on the Dynamic Role Assignment Strategy
Authors: Wang Yu Feng , Wang Li Di , Zhou Ting Zhe
Published: December 2011

Robot Soccer provides a good experimental platform for the automatic control, artificial intelligence, robotics and other researches. A soccer robot system is also a typical multi-agent systems(MAS). Every robot in a soccer team is an agent,so the collaboration between agents, the rational apportionment of the robots' roles and the capacity for actions of the robots is the key to winning game. We present a strategy which is based on dynamic programming algorithm and genetic algorithm. Every robot has fitness to each role through which to carry out the dynamic role assignment, meanwhile, the parameters of the fitness functions could be optimized by genetic algorithm.
Bin Packing Solution for Automated Packaging Application
Authors: Liu Yang , Vo Thanh Vinh
Published: December 2011

This paper introduces the implementation of a new heuristic recursive algorithm for bin packing solution used in automated packaging application. The theoretical method proposed in this paper is successfully implemented on a real ABB robot arm with some important improvements such as added rotation flexibility and removing an added product from the structure. The computational results on a class of benchmark problems have shown that this algorithm not only finds shorter height than the known meta-heuristic ones, but also runs in shorter time. The average running time is very suitable for such kind of automated packaging application.
The Design of a Microstrip Antenna with Radiation Pattern Controlled
Authors: Wang Su Ling , Gan Ya Ting , Wang Guo Dong
Published: December 2011

Microstrip Antennas have many applications in various communication systems. A new configuration of microstrip antenna is proposed in this paper. The microstrip antenna has two radiation ports. Through changing the radiation intensity of the two ports, the proposed structure breaks the balance of the radiation of the microstrip antenna therefore the radiation pattern would be changed corresponsively. Theory analysis is carried out based on microstrip antenna theory. Both analysis and simulation show that the new configuration can realize the radiation pattern controlled and the theory analysis agreed very well with simulation.
Backstepping Control Based on the Dynamic Equilibrium State Theory for Strict-Feedback Nonlinear Systems
Authors: Qiu De Hui , Wang Qing Lin , Yang Jie
Published: December 2011

A novel control approach is introduced for strict-feedback nonlinear systems based on the dynamic equilibrium state theory. First, the basic idea of the dynamic equilibrium state theory is presented. The dynamic equilibrium state is not the origin or the constant, but means change under the effect of input for non-free systems. Then, the method of steady state control is combined with backstepping technology, realizing the feedback linearization and stability step by step and guaranteeing uniform ultimate boundedness of all signals in the closed-loop system. The proposed approach has much simpler expression and is easy to understand. Finally, two simulation examples are used to demonstrate the effectiveness of the proposed scheme.
Design of Intelligent Explosion-Proof Electromagnetic Starting Reactor Based on PIC16F887
Authors: Li Hong Fei , Wang Na
Published: December 2011

According to high-voltage squirrel-cage AC asynchronous motor using string reactor to reduce voltage starting,there are some shortcomings such as circuit complexity, operation and maintenance trouble, the unfavorable to maintain and update and so on. Design of an intelligent explosion-proof electromagnetic starting reactor based on PIC16F887 microcontroller is proposed, this reactor has time type, current type, time-current starting type which can be set and it has temperature detection protection function in the starting process. After starting completion, it also has the bypass electrical locking function which can real-time monitor the current, voltage and temperature signals to realize intelligent. Using the reactor of controller already has been applied rated voltage 10kV, rated power 1600kW fan commissioning in a coal mine, the test results indicate that this reactor controls current smoothly in the starting process, and has reliable starting performance, easy operation, and high degree of intelligence.
Dynamic Finite Element Analysis of a Cylindrical Roller Bearing
Authors: Tong Bao Hong , Liu Yin , Sun Xiao Qian , Cheng Xin Ming
Published: December 2011

A dynamic finite element analysis model for cylindrical roller bearing is developed, and the complex stress distribution and dynamic contacting nature of the bearing are investigated carefully based on ANSYS/LS-DYNA. Numerical simulation results show that the stress would be bigger when the element contacting with the inner or outer ring than at other times, and the biggest stress would appear near the area that roller contacting with the inner ring. Phenomenon of stress concentration on the roller is found to be very obvious during the operating process of the bearing system. The stress distributions of different elements are uneven on the same side surface of roller in its axis direction. Numerical simulation results can give useful references for the design and analysis of rolling bearing.
Functional Analysis Based Conceptual Design of a Type of Novel Mechanical Excavator with Controllable Mechanism
Authors: Cai Gan Wei , Pan Yu Chen , Wang Hong Zhou , Zhang Lin
Published: December 2011

Excavators can be divided into two categories: hydraulic excavator and mechanical excavator. Due to the flexibility and mobility, hydraulic excavator has almost replaced the mechanical excavator. But there still exists some problems such as hydraulic leaks and high costs of manufacturing and maintaining. On the other hand, the latter one is the excavator of choice in oil sands digging and surface mining for its durability, high productivity and low ownership costs resulting from long economic operating life, but lacks flexibility due to the structural limitations. This paper introduces an innovative design of mechanical excavator with controllable mechanism based on functional analysis of the traditional hydraulic excavator. The solving model in the form of Function-Effect-Technical Action Process-Executive Action-Mechanism (F-E-P-A-M) is used. A planar 2 Degree-OF-Freedom (DOF) controllable mechanism is adopted as the executive mechanism. A backhoe type and a face shovel type excavator both with the ability to accomplish flexible output trajectories by the joint operations of three servo-motors are proposed.
Designing an Alternative Game-Based for Learning Thai Language
Authors: Yossawadee Kaoemanee , Saipunidzam Mahamad , Mohammad Noor Ibrahim , Kasbon Rozana
Published: December 2011

This paper focuses on the design and development of a game-based learning application for Thai Language. The main objective of this project is to encourage and support the process of learning Thai among young children who use Thai as their second language. It comes about to expose the young children to the web technology while they learn from the lessons and play the games which is the mechanism to deliver the educational content.
The Technology of High Toughness Ductile Iron Cast Based on Green Manufacturing
Authors: Hou Ji Hong , Meng Chao
Published: December 2011

The concept of Green manufacturing is mainly reflected at Green Foundry. And the greening process for product casting could be accomplished by improving the foundry technique. For example, during the production of widely used and excellent high toughness ductile iron cast QT450－15, using two times desulphurization, covered packet spheroidization, composite inoculation and the like those consist green casting system, which could reduce the usage of rare earth, improve the scarce resource efficiency and product performance. This is of great significance for green manufacturing of ductile iron.
Study on Dynamic Performance of Cutter Head and Cutter System of Rock Tunneling Set-up
Authors: Hong Kai Rong , Zhao Hai Jun , Chang Jia Dong , Wang Hai Xia , Chen Kui , Li Feng Yuan
Published: December 2011

Several modals on Tunnel Boring Machine (TBM) in tunneling are introduced, the revolving rock tunneling simulator set-up is designed, the finite element model of cutter parts of the experimental bench is built, and free mode analysis of it is performed, and the model on system of cutter head, cutter and rock is established. It is shown that natural frequency on the cutter parts is higher, the frequency of first step is 4536Hz, and the most modes are deformations of the cutter loop, vibration acceleration of the cutter decreases with fracture tunnel width increasing, in some degree broken rock mechanics is achieved, foundation is provided for improving using life and adaptability of the cutter, and optimizing arrangement of plate cutter on the cutter head, and finally realizing high efficiency and low energy consumption.
Research of Micro-Accelerometer Based on MOEMS
Authors: En De , Zhang Ning Bo , Feng Jie Yu , Wang Xiao Bin , Wang Ning Ning
Published: December 2011

Micro-Opto-Electro-Mechanical System (MOEMS) has the advantages of small size, light weight, little energy consumption, high reliability, high-volume production and so on. Micro-sensor is a new generation of sensor being developed, improved and expanded, and it will have a huge effect on the measurement area of still adopted traditional sensors. The characteristics and MOEMS manufacturing technologies are introduced. The concept and advantages of micro-sensors are described. The working principle of micro-accelerometer is analyzed.Micro-accelerometer will play an increasingly key role in the new monitoring and control equipments.Pole coupling is the key issue of micro-accelerometer to be resolved, but the rapid developing signal processing technology can provide new solutions to it.
Progress of Research on Preparation of Micro Gas Sensors of Metal Oxide Semiconductors
Authors: An Wen , Yang Chun Ying
Published: December 2011

New progress of research on the preparation technique of micro gas sensors of metal oxide semiconductors is introduced, such as the chemical treatment of the gas sensing film, the deposited technique of gas sensing film in the oxygen radical assisted EB evaporation, the technique of the multilayered film, the fabrication technique of the thermally oxidized, the technique of the electrode configuration, the fabrication technique of the miniaturized arrays by micro-molding in capillaries, the dip-coating of the sol-gel. And their features will be analyzed respectively, and their existing problems and future development directions will be given.
The Error Analysis Caused by Accelerometer Drifs to the Rate Azimuth Platform Inertial System
Authors: Wang Feng Lin , Wen Xiu Lan , Wang Dong Xia
Published: December 2011

To know the influence of deterministic system error to navigation system well, so the precision index of gyroscopes and accelerometers, which are the main components of rate azimuth platform inertial navigation system, and initial calibration precision, can be put forward. Based on the error equations, the characteristic equation of rate azimuth platform inertial system is established, and the solutions of the error equation under static state are obtained with analytical method, and the system error characteristics caused by the accelerometer drifts are analyzed.
Filter Design of Anti-Electrical Fast Transient /Burst and Parameter Selection
Authors: Zhang Zhong , Tong Wei Ming , Li Feng Ge , Wang Yin Shen
Published: December 2011

In order to solve the difficulties for the electrical and electronic equipment in passing through the EFT/B test, a filter design method of the anti-EFT/B interference is presented, and the standard of parameter selection is given. The EFT/B interference source transfer function is given, based on the analysis of the EFT/B mechanism, and an equivalent circuit mode is established. An anti-EFT/B interference filter design is presented thorough the spectrum analysis of the EFT/B interference. Experiments show that the designed filter can inhibit the EFT/B interference effectively, and meet the requirements of electromagnetic compatibility at the same time.
Urban Heat Island Effect Analysis around Hangzhou Bay between 2005 and 2009 Using Remotely Sensed Data
Authors: Zhang Zi Li , Yu Hai Yan , Hu Zun Ying , Zhou Bin , Han Ming Chun
Published: December 2011

By taking advantage of temporal and spatial remote sensing, the present paper was to map, identify and characterize urban heat island in rapid urbanization area of east China. For research areas including six metropolitan cities around Hangzhou bay in east China, urban heat island measurements were monitored from surface temperature maps at 1km resolution derived from MOD11A2 both day and night acquired in the year of 2005 and 2009. LST normalization with NDSTI was applied in order to quantify UHI spatial changes at four seasons. The result showed that urban heat island phenomenon expanded contiguously in the study area. Day change of UHI seems to be more chaos than night change due to day UHI influenced by both solar and human being activities. There was some kind of urban cool island phenomenon in winter when urban surface temperatures were to be -1 – 0°C lower than the ambient LST. Except for winter, other seasons' UHI during daytime changed from 0.5°C to 2.5 °C and nighttime strongly changed from 0.5°C to 5 °C in 2009. During the night, six cites' UHI roughly coincides and UHI in winter was the smallest and in autumn was the biggest one. The study provided causation and environmental awareness of urbanization to urban planners in future urban development.
Harmonic Response Analysis of Rotor-Rolling Bearing-Base System for Fault Diagnosis of Rotating Machinery Based on Base
Authors: Qin B. , Wu J.G. , Li X.J. , Yao B.H.
Published: December 2011

In the fault diagnosis of rotating machinery through vibration analysis of the base, the signal may be weak and impure since the vibration signal which collected at the base is far away from the fault source. In order to provide useful evidences for the condition monitoring and fault diagnosis of rolling bearing based on the base vibration signal analysis, the rotor-bearing-base system model is built by taking the Spectra Quest comprehensive fault simulation test-bed as the object, the harmonic response analysis of the entire system is done with finite element analysis software ANSYS, and the ideal locations where sensors are installed on the base are obtained. These will form the foundation for the condition monitoring and fault diagnosis of rolling bearing based on the base vibration signal.
Eye Location Based on Adaboost and Region Features
Authors: Zhang Xiang De , Tang Qing Song , Jin Hua , Qiu Yue
Published: December 2011

In this paper, we proposed a novel eye location method based on Adaboost and region features. Firstly, Haar features and Adaboost algorithm are used to extract the eye regions from a face image. Then, we highlight the characteristics of eyes to eye location. The method proposed have been tested in the CAS-PEAL-R1 database and CASIA NIR database separately, and the accuracy rate is 98.86% and 97.68%, which demonstrates the effectiveness of the method
Modeling and Simulation of Stirling Engine Fuel Supply System Based on Bond Graph Theory
Authors: Liu Jian Xin , Zhao Kai Bin , Du Hui Yong , Li Min , Wang Zhan Cheng
Published: December 2011

Bond Graph theory is a powerful tool in the field of dynamics and multiple-energy domains analyses of complex engineering systems. On the purpose of analyses the dynamic characters of Stirling Engine fuel supply system, the author built a Stirling Engine fuel supply system model based on Bond Graph theory, derived the state equations including pump system and hydraulic system equations and built the Simulink model for simulation, finally verified the accuracy of the model through experiment.
The Criterion for Expressing Errors with Significant Digit
Authors: Zhang Chun Hua
Published: December 2011

This paper, based on the tiny error rule (TER) in algebraic sum method, derived the criterion for correctly expressing errors with significant digit, for the first time. Then, according to the criterion, an important conclusion is further reached, namely, any error only needs to keep three significant digits at most, or it is meaningless. Thus, this paper further perfected the theory of error, and so, it is of great significance for accurately processing all measurement data.
Design of Gas Monitor System Based on ARM & Linux
Authors: Guo Shun Jing , Zhang Wei
Published: December 2011

The paper presents and designs a new-style gas monitor terminal in coal mine based on ARM chip called S3C2410A, which means the hardware and driver's designation of system uses S3C2410A as its central processing unit and also expounds the detail of software and hardware design. The system communicates with metrical instrument by the RS485 BUS. It can monitor the mine gas in network. It has good man-machine interaction contact surface and can be inserted into intelligence instrument as a general module.
Research on Electromegnetic Compatibility of Communication Interface of Mine Safety Monitoring System
Authors: Liu Zhi Gang , Wang Xu Dong
Published: December 2011

In order to overcome the problem of low tolerance in strong electromagnetic pulse and over-voltage circuitance,the author have done the experiments of over-voltage tolerance on communication interface device of Mine Safety Monitoring System ,using a standard mold by designing Test circuit of transmission signal and overvoltage suffertibility on netface communication interface.Then desiged Surge protection circuit of RS232 and RS432 interface by compareing the The greatest tolerence error-access capacitance caculated values and measured values.
Research on the Data Link Layer of Wireless Sensor Network in Coal Mine
Authors: Li Quan Xi , Zhan Jin Jin
Published: December 2011

With the extensive application of wireless sensor networks, low energy consumption of nodes is the most important consideration.The medium access control MAC protocol is an important technology that structures first floor foundation network architecture. In this article by comparing the domestic and foreign research results, current several kinds of quite typical MAC protocol is analyzed according to the energy saved aspect. According to the special environment of coal mine, we got a MAC protocol which was suitable to mine.
Application on OFDM-Based Transform Domain Communication System in Mine
Authors: Ni Shui Ping , Deng Li Heng
Published: December 2011

The application solution of OFDM-Based Transform Domain Communication System (TDCS) in mine is proposed under the ground where wireless communication is easily disturbed in mine environment. In this paper ,concept, characters and system constitutes of Transform Domain Communication System are introduced. The design and simulation methods are discribed in detail in this thesis. According to the analysis, this solution has good resistance to multipath fading, interference and noise characteristics and wireless communication is more effective in that complex electromagnetic field environment
Space State Modeling of Permanent Magnet Linear Synchronous Motor and Inductance Parameters Calculation
Authors: Wang Hai Xing , Xu Xiao Zhuo , Feng Hai Chao , Si Ji Kai
Published: December 2011

Different from the traditional rotary motors in structure and running state, it is difficult for permanent magnet linear synchronous motor (PMLSM) to build its precise mathematical model by analytical method and the asymmetry of the three-phase winding electromagnetic and electrical parameters of open PMLSM in a low-speed working zone is impossible to take into account. In this paper, considering the structural and running characteristics of PMLSM, a non-linear, asymmetric and variable parameter space state model is built. Then a finite element calculation and actual measurement of the required inductor values of a space state model with a prototype PMLSM are done respectively, and the influence of air-gap on the inductance parameters is analyzed.
Flood Mapping Using ASAR and Landsat Data in Poyang Lake
Authors: Zhao Xin , Li Shi Hua
Published: December 2011

Poyang Lake is the largest freshwater lake in China which located in the Jiangxi province. Flood happened around the lake almost each summer. Remote sensing technology is an effective way to monitoring flood at large scale. This study employs images of Advanced Synthetic Aperture Radar (ASAR) and Landsat Enhance Thematic Mapping Plus (ETM+) to map the flooding area in Poyang Lake. Two ASAR scenes are adopted in this study: one was acquired in flooding period on 1st July 2010, and another was acquired on 9th September 2010 in dry season. Water body is extracted using threshold method, and flood inundation area is detected using the two images. Texture analysis of ASAR data and ETM+ indices are synchronously used in classification. Texture layers of ASAR data are computed, and Normalized Difference Vegetation Index (NDVI) and Modified Normalized Difference Water Index (MNDWI) are also calculated using ETM+ data acquired in the dry season. NDVI and MNDWI derived from ETM+ data are sensitive to soil moisture and vegetation cover., therefore, these two classes are more separable from dry and non-flooded objects than they are in a “ASAR only” classification. The indices derived from ETM+ are used as additional layers for water body classification. Supervised classification is implemented on both ASAR dataset and ASAR+TM data using Maximum Likelihood classifier. Results suggest the classification of ASAR and ETM+ combined data is more homogeneous because the indices reduced speckle-noise, and features can be clearly separated.
Techniques for Building a Read/Write/Execute-Able Web
Authors: Tseng Chun Hsiung
Published: December 2011

In recent years, the usage pattern of the Web has been undergoing dramatic changes. The traditional definition of the Web, “a system of interlinked hyper-text documents”, can no longer describe the situation accurately today. Instead, users want to interact with Web resources and even want to create their own Web resources that can interact with others. This is what we call “Web 2.0”, a new Web that is both read-able and write-able. However, considering Web-based services around us: the calendar services, the traveling services, and the messaging services, etc., one can draw a conclusion that what Web users nowadays expect from the Web are not only contents and interactions but also services. To meet this expectation, a read/write/execute-able Web is demanded. In this paper, new technologies for building such a Web are proposed. A virtual browsing environment is employed to transform existing Web resources into executable services. Furthermore, an HTML-to-XML annotation/transformation technology is integrated into the virtual browsing environment to form the data model part. With these technologies, the Web will be transformed into “a system of interlinked services.”
Optimization of Enzymatic Hydrolytic Extraction Conditions for High Yield Polysaccharide Manufacturing from Liquid Fermented Materials of Hypsizigus Marmoreus
Authors: Yan Pei Sheng , Ma Li Ya , Cao Li Xin
Published: December 2011

Polysaccharides extracted from fruiting body and mycelia of higher fungi have been found to show various biological activities. Traditionally, these polysaccharides are manufactured by the hot water extraction method. Low polysaccharide yield is the disadvantage of this method. This paper reports the optimal conditions to manufacture polysaccharide with high-yield from Hypsizigus marmoreus mycelia using enzymatic hydrolytic extraction method. Neutral protease was selected as the most cost efficient among six enzymes. The uniform design was further conducted to optimize the enzymatic hydrolytic extraction conditions, and a regression model was constructed to predict polysaccharide yield. The optimized procedures was that 2% (w/w) of neutral protease was added into hydrolytic solution and incubated for 4 h at 43°C, then extracted one time at 100°C for 1 h. Under optimized procedures, the measured polysaccharide yield was 15.73±0.15 (mg/g), which was very close to the predicted value of 16.65 (mg/g). The results validated the accuracy of the regression model and the optimized procedure. When following the optimized procedures, polysaccharide yield was raised 75.0% over that before optimization, and increased by 122.5% and 104.8% over hot-water extraction and microwave assisted extraction methods respectively. This was the first study to apply uniform design for optimizing high yield manufacture of mycelia polysaccharides by enzymatic hydrolytic extraction. We concluded that enzymatic hydrolytic extraction was a simple, high yield method to manufacture polysaccharides from mushroom mycelia and might be used widely in polysaccharide-derived functional foods production.
Intelligent Vehicular Warning System for VANET
Authors: Mai Yi Ting , Chen Jeng Yueng , Liu Yi Kuan , Lee Wen Yi , Wu Guan Ting , Li Ming Yuan
Published: December 2011

The vehicular ad hoc network (VANET) has made significant progress in recent years, attracting a lot of interest from academia and the industry. VANET involves vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications based on a wireless network. V2I refers to the communication between vehicles and infrastructure of roadside unit (RSU), e.g., a base station and access point (AP) connected to the Internet. V2V refers to the direct or multi-hop communications among vehicles in VANET. V2V is efficient and cost effective owing to its short range bandwidth advantage and its ad hoc nature. V2V communications are enabling technologies that enhance the driver’s awareness of nearby vehicular traffic, leading to improved traffic safety and efficiency. The V2V mode provides a communications platform between road vehicles (cars, bikes, scooters, motorcycles, trucks, etc.) without requiring a central control unit. Safety-related V2V applications are enabled via an integrated early warning mechanism. To facilitate safe driving, we propose an Intelligent Vehicular Warning System (IVWS) that sends an immediate warning message in the event of an accident. According to V2V communications, the other cars or vehicles could have enough time to avoid the accident and make an appropriate decision such as slow down, stop, and detour after receiving the urgent warning messages. Furthermore, the local CMS (Changeable Message Sign) can show the accident information for neighbor vehicles when receiving the warning message. To achieve experimental architecture with our proposed IVWS, the robot vehicles have been designed to simulate vehicles on the road. Besides, vehicles also apply ZigBee wireless interface to communicate with each other. The experiment has shown that our proposed intelligent system can initially provide message display and safety driving for vehicles when traffic accident occurred.
ACE Inhibitory, Antitumor and Antioxidant Activities of Submerged Culture Materials of Three Medicinal Mushrooms
Authors: Gao Xiu Jun , Yan Pei Sheng , Wang Jian Bing , Yu Jia Jia
Published: December 2011

Mushrooms have been highly valued as tonic foods and herb remedies since ancient times, and have been increasingly concerned because of their biological and pharmacological activities recognized through recent scientific research. Antitumor, antioxidant and ACE inhibitory activities in vitro of liquid fermentation materials from Ramaria botrytoides, Lyophyllum decastes and Mycoleptodonoides aitchisonii were investigated in this study. Water extracts from fermented mycelia and supernatant materials were used to measure their antitumor effect by MTT assay, antioxidant capacity by kit, and ACE inhibitory activity by RP-HPLC. Results showed that mycelia extracts from Ramaria botrytoides has significantly higher anti-proliferative effect on human HCC cell line SMMC7721 (IC50=0.284±0.005mg/ml, p<0.001). Total antioxidant activity of mycelia extracts of Ramaria botrytoides (0.711±0.053U/mg), inhibitory effect of mycelia extracts of Mycoleptodonoidesaitchisonii on hydroxyl radical (86.153±1.763U/mg) and superoxide anion radical (7.363±0.280 U/g) were higher than others significantly (p<0.001). ACE inhibitory activity of mycelia extracts of Lyophyllum decastes (IC50=1.637±0.057mg/ml) was significantly higher than others (p<0.001). Results demonstrated that liquid fermented mycelium of Ramaria botrytoides was potent source of natural compound with antitumor and antioxidant potential. Mycelium of Lyophyllum decastes was potent source of natural compound with ACE inhibitory activity.
Security Weaknesses and Improvements of a Remote User Authentication Scheme Preserving User Anonymity
Authors: An Young Hwa
Published: December 2011

In 2008, Bindu et al. proposed an improvement to Chien et al.'s remote password authentication scheme preserving user anonymity, and has asserted that the scheme is secure against replay attack, guessing attack, insider attack and man-in-the-middle attack, etc. However, in this paper, we have shown that Bindu et al.'s scheme is still insecure against man-in-the-middle attack and password guessing attack, and does not provide user anonymity. Also, we propose an improved scheme to withstand these weaknesses, while preserving their merits, even if the secret information stored in the smart card is revealed. As a result of analysis, the proposed scheme is secure against user impersonation attack, server masquerading attack, password guessing attack and does provide user anonymity. And we can see that the proposed scheme is relatively more effective than Bindu et al.'s scheme.
The Concept of Extensible Authentication Protocol for Mobile Equipment to Heterogeneous Network (EAP-M2H)
Authors: Ou Hsia Hung , Ku Hao Hsiang , Chen Te Yu
Published: December 2011

Extensible Authentication Protocol (EAP) is a universal authentication framework defined by RFC3748 and updated by RFC5247. It is not a specific authentication mechanism for exclusive system and then the widespread acceptance and implementation in wireless networks or other Point-to-Point (P2P) connections. A number of vendor specific EAP methods were proposed for special purpose such as EAP-MD5, EAP-TLS, EAP-TTLS, EAP-PEAP, LEAP, SPEKE, EAP-SIM, EAP-AKA, EAP-FAST, and so on. All of them have a common characteristic that the client submitted his Security Association (SA) to the neighbor Access Point (AP), then AP forward it to identify his validity by Authentication Authorization Accounting (AAA) server of both sides.
Although these EAPs are design to meet the widespread authentication demands. But in fact they have the independent authentication procedure respectively. That is they are incompatible with each other. For mobile devices, in order to meet the needs of different connection it had to support many of the EAPs. This situation for the most mobile devices is a heavy load and result the inconvenient which move in the different service network. This paper devotes in solves this situation. For this goal, an extensible authentication protocol for mobile equipment to heterogeneous network (EAP-M2H) is provided in the paper. EAP-M2H development from the EAP-AKA and improve their applicability and compatibility in heterogeneous network.
Modeling and Simulation for Complex Network Based Military System-of-Systems (SoS)
Authors: Song Xiao , Liu Bing Cheng , Gong Guang Hong
Published: December 2011

Military SoS increasingly shows its relation of complex network. According to complex network theory, we construct a SoS network topology model for network warfare simulation. Analyzing statistical parameters of the model, it is concluded that the topology model has small-world, high-aggregation and scale-free properties. Based on this model we mainly simulate and analyze vulnerability of the network. And this provides basis for analysis of the robustness and vulnerability of real battle SoS network.
Fuzzy Neural Network Compensator for Gantry Stage Synchronous Motion
Authors: Chen Chin Sheng , Lee Mu Han
Published: December 2011

In this paper, a fuzzy neural network (FNN) compensator is proposed for the synchronous motion control of a gantry position stage. Firstly, the cascade control strategy is applied to reduce the single axis position tracking error. However, the synchronous error between dual servo systems is inevitable due to their inequality in characteristics and the environmental uncertainties. The FNN compensator and an online learning algorithm perform a fuzzy reasoning with two inputs of synchronous position and velocity errors between dual drive servo systems and generate the compensated force; the compensated force is fed back to the controller of each axis. The online learning algorithm adjusts the connected weighting of the neural network by using a supervised gradient descent methods, such that the define error function can be minimized. Finally, two kinds of position commands with high and low frequency are designed for the experiments, and the experimental results show that the proposed FNN compensator is feasible to improve the synchronous error of gantry stage.
Finite Element Modeling of Hydraulic Excavator in Soil Cutting Process
Authors: Yang Wei , Wei Pan Ke , Sun Ji Ming
Published: December 2011

A three-dimensional finite element model of hydraulic excavator is proposed to simulate soil cutting. To consider nonlinear soil behaviors, we apply the theory of Arbitrary Lagrangian-Eulerian (ALE) and explicit dynamic method to analyze a large scale fluid-solid structure interaction problem. The elastic-plastic assumption theory is introduced to simulate soil material behavior during the process of soil cutting because the nonlinear elastic-plastic model has advantages of simultaneously accounting for dynamic effects of strain hardening, strain rate, automatic mesh contact with friction capability, soil mechanical behavior and soil-bucket interaction. Soil-bucket interaction is modeled as friction with adhesion depending upon different influencing factors. This paper also investigates the parameters that may cause computational instability in soil cutting analysis. The difficulties in the numerical simulation of soil cutting are overcome by adopting suitable parameters to meet the requirement of proper mesh separation criterion. The proposed modeling can also be used to predict soil stress distribution, soil deformation and Von Mises stress distribution of component in hydraulic excavator.
An Investigation of Heat Transfer on Microchannel Heat Exchanger Flow Arrangement with Gas Heating
Authors: Liu Tsung Lin , Fu Ben Ran , Pan Chin
Published: December 2011

The present study investigates the effect of flow arrangement on heat transfer characteristics in two-phase microchannel heat exchangers (MCHEs) with gas heating. The microchannel heat exchangers are developed to utilize the exhaust heat from a high-temperature gas product of a methanol reformer (a part of a reformed methanol fuel cell). Co-and counter-current flow types of MCHE are tested. Working fluids in the hot and cold sides are helium and liquid methanol, respectively. For both single-phase flow regions, the experimental results indicate that the actual effectiveness of the counter-current MCHE is higher than that of the co-current MCHE. Both of the actual effectiveness of co-and counter-current MCHEs significantly increases with an increase of cold side mass flux. Moreover, the actual effectiveness for both types of MCHE is less relationship to the hot-side thermal power in single-phase zone. The highest actual effectiveness is about 0.6 and 0.72 for co-and counter-current MCHEs, respectively.
Evaluation of Light Irradiation on Decolorization of Azo Dyes by Tsukamurella sp. J8025
Authors: Wu Wen Tung , Jean Ming Der
Published: December 2011

In the previous study, the dye decolorization was investigated byTsukamurellasp. J8025 under the static condition at 30°C. The object of this study was to evaluate the influence of light irradiation with 15W low-pressure mercury lamp on dye decolorization. Three kinds of common culture medium Luria-Bertani (LB), Tryptic Soy Broth (TSB), and Yeast extract-Malt Extract (YEME) were used in this study. Strain J8025 was cultivated in different media added with methyl orange, and the rate of color removal was determined by measuring the absorbance at specific wavelengths. The experiments proved the decolorization efficiency after 48h under light irradiation in LB medium was up to 40%, that in TSB medium was up to 50%, and that in YEME medium was up to 68%, respectively. The decolorization process needed glucose as an energy source to support the bacterial growth and promote the decolorization rate. Due to the salt contained in the dye-wastewater, the effect of salt was investigated. The results showed nearly 98% color was removed after 48 h in the presence of 1% NaCl under light irradiation, but the decolorization was inhibited by high concentrations of salt. The results indicated a strain J8025 coupling with the light irradiation could be potentially used to improve the dye decolorization.
A Modified Heat Pump Air-Conditioning System for Electric Vehicle
Authors: Lin Po Hsu , Cheng Kuang Ting
Published: December 2011

In the present electric or hybrid vehicle, a PTC heater is adopted to provide heating function. In order to overcome the drawback of low efficiency of the PTC heater, a modified heat pump system structure was proposed to recover the waste heat which is generated by the subsystems of the electric vehicle. The recovered heat is transferred by the refrigerant and used to heat up the air that enters the cabin. In this paper, the electric vehicle battery pack is chosen as the target subsystem. A battery cell model was coded on the SC/Tetra platform and corrected according to the experiment data. The simulation results showed that the maximum heat generated by the battery modules (176 cells) under 1.5C discharging is about 356 W which could reduce 20% of the heat absorbed from the environment if a complete battery pack (400 cells) is used.
Study for the Dynamic Response of Rubber Concrete RC Slab
Authors: Tsay Ren Jwo , L-Am Huynh Nguyen Nhat
Published: December 2011

The tradition RC building slab system is very rigid so the vibration and the will induce large noise often creates puzzle of the user. The slab vibration also will reduce the production fine proportion for high tech factory. So we must to enhance the RC slab energy absorbing capacity to reduce RC floor vibration. The rubber material has very good elasticity and energy absorbing capacity so is widely applied in many daily items. But the easy consuming characteristic will increase the waste process problem. If we can apply the high elasticity property in recycle rubber to RC slab so we can reduce the waste pollution and slab vibration behavior in the same time. The complex RC slab real behavior must be measure from test result. In this paper we want to get the dynamic behavior by pedestrian loading for rubber concrete RC slab by laboratory test. By the test results we can found the 5% rubber concrete will concentration to 7.2 Hz.
Graphic Representation and Cognition Diagnosis on Concepts of Linear Algebra
Authors: Lin Yuan Horng , Chen Chin Chun , Yih Jeng Ming
Published: December 2011

The purpose of this study is to integrate pathfinder and item response theory so as to manage concept structures. Concept structure is one important issue of knowledge management as to human knowledge storage. Pathfinder and item response theory are based on graph theory and psychometrics respectively and this integrated method should be feasible to represent concept structures. Besides, fuzzy clustering technique is adopted to provide features of concept structures based on homogeneity of sample. In this study, the empirical data is the assessment of linear algebra for university students. The important concepts of linear algebra consist of subspace, spanning, linear independent, R2 and R3 and many literatures indicate concept structures of linear algebra will influence advanced mathematics. However, little is known about the concept structure and cognition diagnosis on linear algebra. In this study, it shows that lack of concrete examples in general dimensional space will prevent the development of the general theory. There are some limitations for students to use some materials to clarify complicated mathematic concepts perfectly. Most students could not be able to use the geometric insight and apply the Pythagorean of R2 or R3. It shows that methodology of the pathfinder and item response theory will reveal important information of concept structures for students. In addition, fuzzy clustering could distinguish characteristics of concept structures on linear algebra. Finally, some limitations and suggestions as to this study are discussed.
Dynamic Modeling and Dynamic Characteristic Analysis of a New Concept Stratospheric V-Shaped Airship
Authors: Liu Gang , Wang Fan , Hong Guan Xin
Published: December 2011

It has important scientific and engineering applications for near-space platform to design the buoyancy-lifting aircraft with both bigger volume and higher aerodynamic efficiency. This paper provided a design of a new concept V-shaped airship which has a capacity of buoyancy-lifting configuration than the same-weight class conventional airship. In addition, two engines could provide rolling, yawing and pitching moments for the V-shaped airship by changing directions and creating different thrust. Based on the thick aerofoil, the geometry of this V-shaped configuration was then used to develop an aerodynamic estimating model for the V-shaped airship. It renewed estimating methods for the added mass, inertia, the forces and the moments including aerodynamic and engine thrust of the V-shaped airship. Then this paper described a 6 Degree of Freedom (DOF) dynamic model for the V-shaped airship. The open-loop disturbance characteristic of the dynamic model was analyzed across a range of flight conditions and the added mass of the V-shaped airship were compared with the same weight-class teardrop-shaped dull-hull airship. Finally, the characteristics of buoyancy and lift between V-shaped airship and dull-hull airship were compared at different velocity. The results show that the aerodynamic efficiency of the V-shaped airship is improved obviously from the same-weight class dull-hull airship across a range of flight velocity.