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Journal receives papers in continuous flow and we will consider articles from a wide range of Information Technology disciplines encompassing the most basic research to the most innovative technologies. Please submit your papers electronically to our submission system at http://jatit.org/submit_paper.php in an MSWord, Pdf or compatible format so that they may be evaluated for publication in the upcoming issue. This journal uses a blinded review process; please remember to include all your personal identifiable information in the manuscript before submitting it for review, we will edit the necessary information at our side. Submissions to JATIT should be full research / review papers (properly indicated below main title).

Journal of Theoretical and Applied Information Technology
May 2013 | Vol. 51 No.1

Title:	BAT ALGORITHM FOR ROUGH SET ATTRIBUTE REDUCTION
Author:	AHMED MAJID TAHA, ALICIA Y.C. TANG
Abstract:	Attribute reduction (AR) refers to the problem of choosing an optimal subset of attributes from a larger set of possible attributes that are most predictive for a given result. AR techniques have recently attracted attention due to its importance in many areas such as pattern recognition, machine learning and signal processing. In this paper, a new optimization method has been introduced called bat algorithm for attribute reduction (BAAR), the proposed method is based mainly on the echolocation behavior of bats. BAAR is verified using 13 benchmark datasets. Experimental results show that the performances of the proposed method when compared to other features selection methods achieve equal or better performance.
Keywords:	Attribute Reduction; Bat Algorithm; Nature Inspired; Rough Set
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	OPTIMIZATION METHOD OF PILOT ALLOCATION FOR COOPERATIVE AMPLIFY-AND-FORWARD OFDM SYSTEM
Author:	SUOPING LI, LITING YANG, JIN LI
Abstract:	Pilot-assisted channel estimation has been studied only in common cooperative AF (Amplify-and-Forward) OFDM which has no feedback mechanism. In this paper, for cooperative AF-OFDM system, we propose a feedback technique in which the pilot allocation mechanism is adapted to the cooperative mobile channel. Then we show how uniform pilots may no longer be optimal compared with our pilots. After deducing the instantaneous system SNR is the function of the pilot allocation, we optimize the pilot locations using optimization method at the destination node. We examine the feedback overhead that is associated with our method and make comparisons with the conventional uniform pilot allocation. To improve system capacity, we suggest reduce the feedback information using K-means clustering algorithm. Simulation results confirmed that the proposed optimization method has an ideal performance gains and the algorithm of feedback reduction can reduce the feedback information under the premise of ideal performance.
Keywords:	AF-OFDM system, Feedback mechanism, Optimization of pilot allocation, Reduce feedback
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	STRATEGY RESEARCH FOR THE SUPPLY CHAIN MANAGEMENT BASED ON VALUE CHAIN ANALYSIS IN CONSTRUCTION ENTERPRISES
Author:	BAI XIAO-PING, XU CHUN-MEI
Abstract:	With the development of economic globalization and the information network system, in order to deal with more and more fierce market competition situation, supply chain management (SCM) which is looked as a kind of main operation modes, has been adopted by manufacturing enterprises, Construction industry has already become pillar sector in the national economy. The particularity of its product and the complexity of its production process have challenged the operation mode of building construction enterprises in which the high cost and low benefit phenomenon often exist. This paper presents the detailed method and procedure applying supply chain management to the construction enterprises from value chain analysis side, also analyzes some strategies that should be selected when the supply chain management based on value chain analysis is applied in building construction enterprises, and gives detailed case study. The presented detailed methods and points can offer the meaningful reference for solving some problems existed in building construction enterprises, such as the discontinuance of business, low level productivity, the big losses, insufficient resource utilization rate.
Keywords:	Supply chain management; Value engineering; Construction industry ; Value chain; Strategy; Purchasing
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	DESIGN AND IMPLEMENTATION OF A PI CONTROLLER FOR AN AUTOMATED BUILDING WATER SUPPLY SYSTEM USING PLC TECHNIQUES
Author:	HASSAAN TH. H. THABET
Abstract:	High stories in multistory buildings in most of the Middle East countries suffer from water shortage due to bad and old designs in water supply systems. An automatic regulation water supply system based on PLC (Programmable Logic Controller) & VFD (Variable Frequency Drive) is proposed.This paper explains water supply system’s energy conservation principle of a pump with speed control according to disturbances. The system can supply the building with water with constant pressure and save energy efficiency. The system was tested for 24 hours a day for three weeks with capacity of (20 -120) L/min of water, and about 10 meters building height. The pressure of the supply network is about 1.2 Bar.
Keywords:	Controlled System, Programmable Logic Controllers (PLC), PID Controllers
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	OPTIMAL DECISION-MAKING MODEL OF RELIABILITY DESIGN FOR PNS
Author:	CHONG CHEN, GUICHU WU
Abstract:	The power network system (PNS) is an important part of the power System, safety and reliability is ensured only by reliability optimized design. By analyzing the influential factors of reliability allocation, the method of fuzzy synthesis evaluation based on fuzzy mathematical theory was presented to carry through optimum allocation of power network system in this paper. Namely, appointed reliability index is distributed rationally to subsystem of PNS by defining factor set of reliability level and the weight of factors, and further defining synthesis decision-making based on attachment degree of every factor. Both reliability of whole system and economic benefit are ensured by the method, and design example is given . It provides a feasible method for reliability optimum design of power system.
Keywords:	Reliability Allocation, Power Network System(PNS), Fuzzy Synthesis Evaluation, Reliability Optimum Design
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	HIGH-DIMENSIONAL HIERARCHICAL OLAP : A PREFIX–INDEX HIERARCHICAL CUBING APPROACH
Author:	KONGFA HU, ZHE SHENG, LING CHEN
Abstract:	The pre-computation of data cubes is critical for improving the response time of OLAP(online analytical processing) systems and accelerating data mining tasks in large data warehouses. However, as the sizes of data warehouses grow, the time it takes to perform this pre-computation becomes a significant performance bottleneck. In a high dimensional OLAP, it might not be practical to build all these cuboids and their indices. In this paper, we propose a multi-dimensional hierarchical cubing algorithm, Prefix-index hierarchical cubing, based on an extension of the previous minimal cubing approach. This method partitions the high dimensional data cube into low dimensional cube segments. Such an approach permits a significant reduction of CPU and I/O overhead. Experimental results show that the proposed method is significantly more efficient than other existing cubing methods.
Keywords:	Data cube, High dimensional OLAP, Prefix-Indexing cubing
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	OPTIMIZING AND COORDINATING THE DYNAMIC CONFIGURATION OF PORTS’ COLLECTION-DISTRIBUTION TRANSPORTATION CAPACITY
Author:	HAIHONG YU
Abstract:	The collection-distribution transportation capacity has great significance for operation efficiency of a port. Facing with the changing demand of containers transport, ports are having an important decision problem of optimally configuring the collection-distribution transportation capacity of ports with a view of long term and dynamic, which is good for ports to maintain high operation efficiency and reduce idle waste of transportation resources. Through the analysis of a port supply chain consisted of a port, a freight forwarder and a transport fleet, the article constructs a multi-period dynamic optimization model to discuss the optimal strategy of the collection-distribution capacity configuration. Besides, the article analyzes the coordination problem of this dynamic strategy of capacity configuration. The results show that the optimal configuration strategy is a function which includes three parts: 1) basic configuration amount; 2) the derived amount by demand; 3) the amount affected by period. The optimal dynamic strategy is not affected by direct transport operating cost but trucks holding cost. In addition, we obtain the conclusions that present wholesale price freight charge mode between transport fleet and forwarder can not achieve coordination. What we need is to change this wholesales price mode and to implement a new freight charge mode called “service plus capacity” mode.
Keywords:	Ports, Collection-Distribution Transportation, Capacity Configuration, Dynamic Optimization, Coordination
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	RESEARCH ON OPEN-ARCHITECTURE INTEGRATED EXPERIMENTAL PLATFORM WITH INTELLIGENT MONITORING IN SUGAR BOILING PROCESS
Author:	YANMEI MENG, HAIFENG PANG, QI HE, 4HAIPING HE, XIAOCHUN WANG
Abstract:	The sugar boiling process is the most important element and the crucial link to the sugar production. Considering the existing problems in technology and equipment, this paper studies an open-architecture integrated experimental platform, which provides monitoring in scientific study of sugar boiling process. It has open input/output interfaces and could simulate the real production of sugar boiling process, based on its modular and reconfigurable hardware. The scalable and component-based software could automatically adjust the control parameters such as temperature and pressure, using different algorithms and various control strategies, by a soft sensor method of supersaturation. It provides an optimized monitoring technology to the actual production. A national invention patent has been applied.
Keywords:	Sugar Boiling, Open-Architecture, Integrated Experimental Platform
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	AN IMPROVED MODEL FOR SYMBOL RATE ESTIMATION BASED ON WAVELET TRANSFORM
Author:	MINGWEI QIN, TAO DAI, WEI LIU
Abstract:	In non-cooperative communication system, symbol rate is a crucial part of parameter estimation. Based on the wavelet transform, an improved symbol rate estimation model is proposed. Without a prior knowledge, we raised a better symbol rate pre-estimation method in view of corrected average periodogram’s smoothing power spectrum. By choosing the optimal wavelet scale and fast Fourier transform, we adopted a multi-synchronous reference algorithm to extract the symbol rate. Simulation demonstrates that the performance of accuracy and anti-noise is improved than traditional algorithms. The normalized mean square is lower than 10-2 at SNR=0dB and reached 10-5 when SNR=10dB, which is approaching more closely to CRLB.
Keywords:	Symbol Rate Estimation; Wavelet Transform; Optimal Scale; Non-Cooperative Communication; Multi-Synchronous Reference; Fast Fourier Transform; Corrected Average Periodogram’s Smoothing Power Spectrum.
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	HEALTH MONITORING SYSTEM OF AN IN-SERVICE LONG-SPAN CONCRETE CABLE-STAYED BRIDGE USING SMART SENSORS
Author:	YONG ZENG, BO LI, HONGMEI TAN, XUESONG ZHANG
Abstract:	Health monitoring technology has played a successful and powerful role to ensure the safe operation and extend the service life of the bridges. Maintenance costs of the bridges can be greatly reduced to avoid the final closure of traffic caused by frequent overhaul of major losses through early detection of disease. Since in-service concrete cable-stayed bridges have been put into operation for a long time, some degree of diseases occurs. This type of bridge health monitoring system (HMS) is quite different with health monitoring system of new bridges, in which damage must be considered. To ensure the safe use of the bridge in service, it is necessary to develop long-term health monitoring system. Monitoring the long-term and regular change of the mechanical properties of the key parts of the bridges by use of modern means of diagnosis, operational status and endurance capacity can be evaluated to ensure the safe use of the bridge and extend life. Different types of sensors should be installed at the key locations and components where large displacements and stresses are expected to occur. It is concluded that a HMS for long-span bridges should be able to monitor the loading and structural parameters. Monitored results can facilitate the scheduling of bridge inspection and maintenance activities, once the damage is identified.
Keywords:	Health Monitoring System, Concrete Cable-Stayed Bridge, Sensor
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	THE DEVELOPMENT OF A 20 KHZ HIGH-POWER INVERTER SPOT WELDING POWER SUPPLY
Author:	QIU QI, LI XIGONG, ZHOU ZHAOFENG, SHAO WEI
Abstract:	A high-power inverter spot welding power supply with 20kHz switching frequency is developed; secondary rectification uses a full wave rectifying circuit of single-coil and double inductors, double tubes, which can effectively improve the switching frequency with the existing device. The integrated high frequency transformer is designed which can effectively decrease various factors that affect the output power, then increase the output current. The power of inverter spot welding power supply approaches 90kVA.
Keywords:	20 khz, Inverter Spot Welding, Rectifying Circuit, The Integrated High Frequency Transformer
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	IP MULTIMEDIA SUBSYSTEM: SECURITY EVALUATION
Author:	E.BELMEKKI, N.BOUAOUDA, B.RAOUYANE, M.BELLAFKIH
Abstract:	The IMS (IP Multimedia Subsystem) as network controller includes effective mechanisms for new services, regardless of the access technology. The network regroups all existing access IP-based technologies that unify access and minimize costs of service deployment. However, such architecture poses significant security challenges at network access and services providing. Indeed, the diversity of technologies used and entities included in the IMS control as well as user mobility and type of deployed services increase the risks and issues related to security. Thus, the paper proposes a state of the art of the IMS network security. Our focus is to highlight the most critical attacks at protocol level and access layer. The paper, then, illustrates in a test bed an effective way to secure a time sensitive application and evaluates the impact of the applied security measurements on the quality of service (QoS).
Keywords:	IP Multimedia System (IMS); Quality of services (QoS); Real-Time Protocol (RTP); Session Initiation Protocol (SIP)
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	RESEARCH OF A CONTROL VALVE CHARACTERISTICS TEST
Author:	YUDONG XIE, YANJUN LIU, YONG WANG
Abstract:	Control valves are commonly found in modern process plants. The control valve reliability is critical to the control quality and safety of a plant. Whether a control valve meets the challenge of the control requirement depends on its response characteristics. To obtain the characteristics of the control valve, an experiment test system is developed to assess the performances of the control valve, the graphical description for the performances of the control valve is proposed, and the test method is presented.
Keywords:	Test Technology, Control Valve, Process Control, Response Characteristics
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	DYNAMIC SIMULATION AND VELOCITY ADJUSTMENT OF MECHANISM BASED ON MATLAB
Author:	KUN LV, YANG YUAN AND MING-JUN ZHANG
Abstract:	In order to improve longevity, efficiency and working quality of machinery, taking the six-bar mechanism as example, the velocity fluctuation of six-bar mechanism and its adjustment method are studied. At first, an equivalent dynamic model of six-bar mechanism was established with the vector loop equations and kinematic and dynamic characteristics were analyzed based on the model. Then kinematic and dynamic simulation of six-bar mechanism was carried out with software Matlab. The simulation results reveal the real movement regularity of six-bar mechanism of shaper in the stable operation stage. By comparing the simulation results with theoretical calculation, the validity of this method was verified. Finally, the flywheel which can store and release energy was used to adjust the periodic velocity fluctuation. The simulation results with or without flywheel show that the flywheel is of considerable adjustment effect on periodic velocity fluctuation. The peak value of angular velocity and angular acceleration of equivalent component were decreased by 11.3% and 99.57% respectively, thus to improve movement stability. This method proposed in the paper has universal significance for the general mechanism analysis and design.
Keywords:	Matlab; Six-Bar Mechanism; Simulation; Velocity Fluctuation; Adjustment
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	SCHEDULING RESEARCH BASED ON GENETIC ALGORITHM AND QOS CONSTRAINTS OF CLOUD COMPUTING RESOURCES
Author:	GUANG LIU, CHEN YANG, DAOGUOLI
Abstract:	Cloud computing is a new business model based on Internet and aims to provide information service for users. Resource scheduling is one of the key technologies of Cloud Computing. Analyzing the representative achievement of cloud computing resources scheduling, and then according to the problem that there are large gap between most algorithm task design and actual service needs, we present a task scheduling algorithm on the basis of multi-QoS constrains and genetic algorithm. It supports different users choose different scheduling goals according to their own needs. By doing experiment on cloud computing simulation platform called CloudSim, the results shows that this algorithm can satisfy the QoS constrains, at the same time, it can guarantee system load and improve the efficiency of the task scheduling.
Keywords:	Cloud Computing, Qos Constrains, Genetic Algorithm, Task Scheduling
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	APPLICATION OF GREY NEURAL NETWORK TO FORECASTING OF CERAMIC INDUSTRIAL OUTPUT
Author:	JUAN LI
Abstract:	Ceramic industrial output is susceptible to the influence of various factors, with the characteristics of the nonlinear and stochastic volatility. Grey neural network model combines the advantages of grey GM(1,1) model and neural network model, which suits for few sample data and volatile random questions. In this paper, the ceramic industrial output of Jingdezhen from 2002 to 2010 are used as research object to build grey neural network model and check its precision through analysis of some practical examples. The result shows that grey neural network model not only has higher precision, but also better shows the data sequence trend than the grey GM(1,1) model does.
Keywords:	Grey Neural Network Model (GNNM), GM(1,1) Model, Nonlinear, Forecasting
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	A NEW APPROACH OF RSSI PROBABILITY DISTRIBUTIONS FOR INDOOR POSITIONING
Author:	CHEN LINA, ZHANG YU, ZHENG ZHENGQI
Abstract:	In short range Radio Frequency technologies, Wireless Location Area Network (WLAN) has already be used as one of the most effective indoor positioning system. It is competitive in terms of both accuracy and cost compared to similar systems. To date, several signal strength based techniques have been proposed. Fingerprinting is a common technique for indoor positioning. It consists of the data training phase and the real-time positioning phase, data training phase is to generate a radio map for the location phase. Generated map is the key for the accuracy of positioning, for generating the radio map we need collect samples at each reference point and analyse Radio Signal Strength Indicator (RSSI) . This paper presents a new approach to approximate RSSI probability distribution, that is the adjusted Weibull function. Researchers have done several experiments in difference conditions, the test results show that the adjusted Weibull function can well approximate 2.4G WiFi RSS probability distribution. I hope this study can bring some reference for fingerprinting indoor positioning.
Keywords:	Indoor Positioning, Fingerprinting, RSSI, Adjusted Weibull Function, WiFi
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	THE DYNAMIC VOLTAGE AND FREQUENCY SCALING BASED ON THE ON-CHIP MICROCONTROLLER SYSTEM
Author:	TIEFENG LI, CAIWEN MA, WENHUA LI
Abstract:	With the rapid increase of complexity and size of the on-chip microcontroller system (OCMS), the power consumption issue for the OMCS is increasingly becoming critical and needs to be solved quickly. Because the CPU is often the major power consumer in the OCMS, so an important strategy to achieve energy saving is via the dynamic voltage and frequency scaling (DVFS), which can enable a processor to operate at a range of voltages and frequencies. However, it needs to be emphasized that the conventional DVFS is fully executed by the software scheduler in the operating system, and its main drawback is that the scheduler can’t accurately track the performance requirements of CPU when the dormant frequency of CPU is increasing continuously. In this paper, we firstly present a typical hardware DVFS architecture, which can automatically carry out DVFS without the software scheduler involvement. Therefore, it avoids increasing the software's workload and reduces the power consumption.
Keywords:	Power Consumption, DVFS, Software Scheduler, Performance Requirement
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	AN IMPROVED PARTICLE SWARM OPTIMIZATION ALGORITHM FOR PROTEIN STRUCTURE PREDICTION BASED ON AB MODEL
Author:	YIWEN ZHONG, JUAN LIN, XIAOYU LIN, HUI YANG
Abstract:	An improved particle swarm optimization algorithm, which combines the idea of simulated annealing algorithm and opposition-based learning strategy, is presented for NP-hard protein structure prediction based on AB model. Flying grain is used to control the neighborhood structure of particle, so particle can search the global optimum in solution space more finely. An opposition-based learning is used to keep the diversity of swarm and improve the algorithm’s ability to escape from local optima. Furthermore, the Metropolis criterion of simulated annealing algorithm is used to balance the exploitation and exploration ability. Simulation results show that those strategies can improve the performance of the proposed algorithm effectively.
Keywords:	Particle Swarm Optimization, AB Model, Protein Structure Prediction, Simulated Annealing Algorithm, Opposition-Based Learning, Flying Grain
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	FPGA-BASED HARDWARE DESIGN OF CLOSED LOOP CONTROL FOR FIBER OPTIC GYROSCOPE
Author:	Q. D. SUN, Z. H. ZHU, B. P. LAROUCHE
Abstract:	The stability, reliability and miniaturization of fiber optic gyroscope (FOG) are always the research focuses and difficulties. This paper presented a hardware design method for the digital closed loop control system of FOG based on FPGA. Based on a large number of experiments, this paper summarized the parameter demands for each module of closed loop control circuit and designed a corresponding hardware circuit using FPGA. The proposed twice closed loop technique improved the zero offset stability of FOG. The using of FPGA brought the digital signal processing by software, the system reliability and agility enhancement as well as the system miniaturization. Particularly, we discussed the problems of component selection and the anti-jamming measures for PCB design to improve the performances of the system. We also developed some samples of FOG using this design method. The experiments and tests show that the proposed method is efficient and valuable. The zero-biases of all samples are all less than 0.075deg/h.
Keywords:	Fiber Optic Gyroscope, Hardware Design, Digital Closed Loop, Second Closed Loop, FPGA
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	SHIP DYNAMIC POSITIONING SYSTEM BASED ON BACKSTEPPING CONTROL
Author:	ZHANG CHENG-DU, WANG XI-HUAI, XIAO JIAN-MEI
Abstract:	Ship dynamic positioning refers to ship which singly keeps its fixed position on the sea by its own installation propeller without anchor. Backstepping design method using in the uncertainty system is a kind of systematic controller synthesis method and is a regression design method which combine the selection of the lyapunov function with the design of the controller. This paper begin with the minimum order differential equation of the system, then introduce the concept of virtual control and design the virtual control meeting the requirements step by step, in the end design the real controller according with the required index. At last establish the modeling and simulate in the Matlab, realize the Backstepping control in combination with S-function. The simulation results suggest that we can use Backstepping method to realize the control of the ship dynamic positioning system.
Keywords:	Ship, Dynamic Positioning System, Backstepping Control, Matlab
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	NUMERICAL ANALYSIS AND RESEARCH ON COMPUTING VISUALIZATION OF STRENGTH REDUCTION FINITE ELEMENT METHOD BASED ON DIFFERENT INSTABILITY CRITERIA
Author:	LI RONGJIAN, LIU JUNDING, YAN RUI
Abstract:	In the analysis of strength reduction finite element method, there are a variety of computational judgments of instability. Therefore, it is necessary to approach the applicability and discrepancy of different instability criteria. Based on the thought of real-time visual analysis, this article gives the research and development of corresponding visual programs, and finishes the real-time visual display technique of view about the relationship between three instability criteria and the strength reduction factor in computation of strength reduction finite element method. Then this article makes the numerical computation and analysis of a rather complicated slope. Research indicates that with the combination of finite element computation of strength reduction and the visual technique of computer, the sliding surface and stability of a slope can be analyzed intuitively. For slopes with local sliding surface or complicated shapes, safety factors are somewhat different because of employing the different instability criteria in the computation of strength reduction finite element.
Keywords:	Slope, Safety Factor, Instability Criterion, Numeric Computation, Visual Analysis, Strength Reduction Finite Element Method
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	SIMULATION OF PERMANENT MAGNET SYNCHRONOUS MOTOR CONTROL SYSTEM WITH EXTENTED KALMAN FILTER
Author:	TAO XU, ZHENGBIN ZHANG
Abstract:	With the development of Permanent Magnet Synchronous Motor (PMSM), it is applied to more and more areas. The control system of PMSM becomes the most important issue in applications. Because the sensorless control system possesses some good performances, it attracts many researchers’ interests. This paper presents the application of Extended Kalman Filter (EKF) in PMSM speed control system. A PMSM vector control system model is established with Matlab/Simulink. The mathematical model of two-phase stationary coordinate system ( - coordinate system) is adopted for linearization of the nonlinear mathematical model of PMSM. EKF algorithm estimates the rotation angle and rotation speed of the rotor of PMSM in the process of system control. The simulation results show that the control system works smoothly in the cases of the super-speed, slow-speed and with load. EKF estimations of the rotation angle and speed track actual angle and speed from sensors accurately.
Keywords:	Permanent Magnet Synchronous Motor (PMSM), Modeling and Simulation, Extended Kalman Filter (EKF), Vector Control
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	IMPLEMENTING VALUE INVESTING STRATEGY THROUGH AN INTEGRATED FUZZY-ANN MODEL
Author:	SHEN, KAO-YI
Abstract:	Value investing strategy is a main approach that has been widely examined in the academic field for identifying stocks with good prospects. However, to implement this strategy in practice, it is unavoidable to explore the implicit relationship among financial performance and subsequent stock returns for making decisions. Thus, this research adopts a theoretical framework from the value investing strategy and proposes an integrated AI (artificial intelligence) model to learn the complicated if-then rules for supporting stock selection. The proposed Fuzzy-ANN model may leverage its superior learning capability of neural network for modeling large amount of data, and the fuzzy inference system is used to retain the plausible relationships among financial variables and stock movements. An empirical case is illustrated for how to apply the proposed model in the Taiwan’s stock market. The selected value stocks (i.e., high value portfolio) outperformed the market indexes (Taiwan 50 index and Taiwan stock exchange weighted index) in various holding periods. To put risk factor into consideration, the high value portfolio also surpassed the market indexes by using the Sharpe ratio measurement with statistical significance. The result indicates that the proposed Fuzzy-ANN model is capable to select high value stocks with meaningful insights.
Keywords:	Artificial Neural Network (ANN), Adaptive Neuro-Fuzzy Inference Systems (ANFIS), Fundamental Analysis, Investment Strategy, F-score Model
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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Title:	THE CONSTRUCTION AND DESIGN OF E-LEARNING PLATFORM FOR DATABASE COURSE
Author:	YONGZHEN KE, QIANG ZHANG, FAN QIN, WENJU LIU
Abstract:	With the rapid development of computer technology and the improvement of performance of mobile devices, e-learning based on the Internet and smart mobile devices becomes an important direction of educational development. This paper proposed the system design idea, general framework and functions realization of e-learning platform for database course. The platform broke through the traditional teaching mode, limited by time, place, laboratory equipment and teacher conditions, and allow students to independent learning, independent experiments and automatic experimental evaluation. The e-learning platform will help improve the teaching quality of database course, and ultimately achieve the purpose of mobile learning.
Keywords:	Database Course, E-learning, Remote Self-Experiment, Automatic Revaluation, Mobile Learning, SOA
Source:	Journal of Theoretical and Applied Information Technology May 2013 -- Vol. 51. No. 1 -- 2013
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