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23,675 Article Results

A Method for Detecting and Blocking Instant Messaging Software

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2693
Hao Zhang , Guangli Xu , Jiongzhao Yang , Jianmin Li
Instant messaging software, as a convenient network communication tool, is becoming more and more popular. At the same time, it also brings risks in security of local area network (LAN). Through studying in typical instant messaging software and detected by the combination of misuse detection and protocol analysis, an architecture of detecting and blocking mechanism of instant messaging software is proposed in this paper and its prototype system is achieved on Windows platform. This new system effectively solves the problems that the efficiency of traditional firewall application layer data filtering is low and the firewall cannot dynamically adjust the filtering rules, providing a good application value for the protection of the security of local area network. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3394 
Volume: 11
Issue: 10
Page: 5684-5693
Publish at: 2013-10-01

The Evolution of Dual-Wavelength Dissipative Soliton in Yb-Doped Fiber Lasers

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2745
Yanyan Zhang , Qiang Li
Dual-wavelength dissipation soliton (DS) in the all-normal-dispersion ytterbium-doped fiber laser (YDFL) is reported. Using a phase-shift long period fiber grating (PS-LPFG) as an all-fiber format spectral filter in the laser cavity, self-starting dual-wavelength pulses are obtained by nonlinear polarization evolution (NPE). The mode-locking mechanism of the ANDi cavity with different central wavelengths has analyzed. Experimental results show that the NPE together with the PS-LPFG play key roles in the generation of the dual-wavelength, meanwhile, a switchable dual-wavelength mode-locked fiber laser can achieve through change the polarization of the cavity. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.2961
Volume: 11
Issue: 10
Page: 6105-6110
Publish at: 2013-10-01

Application of ERPs to Evaluation of Clothing Comfort through physiological signals

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2682
LIU Yunjuan , CHEN Dongsheng
Based on analyzing domestic and foreign literatures concerning event-related potential research, this paper analyses the theory of comfort of wearing by using ERPs. This paper makes a summary of what comfort evaluation for wearing using ERPs, Finally propose the research direction in this domain of identifying from EEG the nerve reflection related to special feeling and neurocognitive events, for the purpose of using impersonal metrics to evaluate subjective feelings of clothing comfort and then provide a new method for designing clothing to be more comfortable. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3345 
Volume: 11
Issue: 10
Page: 5594-5599
Publish at: 2013-10-01

Region of Interest Coding Based on Support Vector Machine in Transmission System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2738
Li Zhu , Xiaoguang Wu , Rong Li
The development of network technology and multimedia technology has promoted the development of the integration, digitalization and individualization of communication technology, and has realized multiple functions based on wireless channel network, including voice, data and image. On the basis of classification by Support Vector Machine (SVM), this paper has proposed a low bit-rate coding method for segmenting the Regions of Interest (ROI) of objects through reasonably selecting initial class center and dynamically adjusting the number of categories, and designs its 3-dimension model method. In low bit-rate coding, the ROI is coded first using SPIHT algorithm, and then the background or the regions insensitive are coded using H.264 code, analyzing the experimental data and designing the structure, we can get the relation among related parameters under conditions of different permanent-magnet thickness and air gaps. It is proved that this method can achieve a better recognition effect, greatly improve the coding efficiency and satisfy the visual effects of human eyes, which can provide criteria in theory and application for designing on new driving principle, control system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3463 
Volume: 11
Issue: 10
Page: 6051-6059
Publish at: 2013-10-01

A 4th-order Switch-capacitor Low-pass Filter for Quartz Gyroscope Interface Circuit

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2697
Yu Fan , Yang Huijing , Li Gang
This paper presents the computer aided design of a 4th-order switch-capacitor low-pass filter applied in quartz gyroscope interface circuit. After a introduction of switch-capacitor filter (SCF) and its application in quartz gyroscope, the system-level analysis and design is given. Then the circuit design of amplifier, CMOS switch and non-overlapping clock is described. The Fourth-order low-pass SCF has been implemented under 0.5um CMOS process and simulated in computer aided design software. The final simulation results show that the passband is 99.7Hz , and the maximum pass-band ripple is about 0.14dB.The stop-band is 1KHz, and the minimum stop-band attenuation is 78.6dB. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3398  
Volume: 11
Issue: 10
Page: 5718-5724
Publish at: 2013-10-01

The Method of Signal Decomposition to Reduce the PAPR

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2688
Yinghua Tong , Shengling Geng
A new method of signal decomposition based on the baseband to reduce the PAPR which Decompose the OFDM signal into two signals, The new method  and its degree of PAPR improvement are introduced in detail . Two thresholds are introduced, compare threshold Tc and decompose threshold Td .Simulation the results in different thresholds .The results show that the method can reduce the PAPR greatly. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3389
Volume: 11
Issue: 10
Page: 5644-5651
Publish at: 2013-10-01

Reliability Estimation based on Step-Stress Accelerated Degradation Testing by Unequal Interval Time Series Analysis

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2701
Li Wang , Zaiwen Liu , Chongchong Yu
This paper proposes a reliability estimation method based on Step-Stress Accelerated Degradation Testing (SSADT) data analysis using unequal interval time series analysis. A Multi-Regression Time Varying Auto-Regressive (MRTVAR) degradation time series model is proposed. Product SSADT data are treated as unequal interval composite time series and described using MRTVAR time series model and utilized to predict long-term trend of degradation. By using the suggested method, product reliability is obtained. An example is presented as a verification of the modeling technique and estimation method. A reasonable estimation of lifetime and reliability of the product is obtained by employing the present method. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3402
Volume: 11
Issue: 10
Page: 5749-5757
Publish at: 2013-10-01

Fuzzy Keyword Search with Safe Index over Encrypted Cloud Computing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2717
Lixi Liu , Chi Zhang , Shaowen Yao , Shipu Wang , Wei Zhou
As cloud computing becomes more and more utilized, sensitive data are being stored in cloud central servers. To ensure privacy, these data are usually encrypted before uploading, which makes searching complicated. In this paper we propose architecture of fuzzy keyword search with safe index. Bloom filter is used to build safe index which increases the searching effectiveness on a large dataset. The size of index is fixed so that the space efficiency is promoted. The experiment result shows that our searching scheme is effective and can be adapted to large encrypted file system.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3419
Volume: 11
Issue: 10
Page: 5884-5889
Publish at: 2013-10-01

An Optimal Routing Strategy Based on Specifying Shortest Path

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2761
Yonghua Xu , Fei Shao
Unlike the shortest path is randomly chosen in the traditional shortest path routing strategy, a novel routing strategy to improve the network transportation capacity is proposed in this paper. According to the different characteristics of the nodes along actual paths, we specify the shortest paths of all pairs of nodes aiming at reducing the betweenness of those high-betweenness nodes. Simulations on both computer-generated and real-world networks show that the new routing strategy can enhance the network transportation capacity greatly. And it works better in those networks with the fuzzy community structure. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.2963
Volume: 11
Issue: 10
Page: 6224-6231
Publish at: 2013-10-01

Modeling and Simulation of Virtual Clay Pigeon shooter Training System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2719
Jin Yanxia , Shi Zhibin
As a popular sports event, clay pigeon uses real guns and bullets as its tools. To improve the training effect, reduce its cost and danger, the development of a real-time interactive and perceptive virtual training system by using simulation technology becomes urgent. This system uses Visual C++、Vega、Creator as its development platform to conduct modeling and simulation of clay pigeon’s and grapeshot ‘s flying path and the collision effect of the two objects. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3421
Volume: 11
Issue: 10
Page: 5898-5903
Publish at: 2013-10-01

Research on bottom detection in Intelligent Empty Bottle Inspection System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2679
Bin Huang , Sile Ma , Yufeng Lv , Hualong Zhang , Chunming Liu , Huajie Wang
Intelligent empty bottle inspection system is an important inspection equipment of empty bottle before filling beer, and it is a blend of machine vision, precision machine and real-time control. They need to cooperate perfectly to achieve the desired effect. In the design of the empty bottle inspection system, one of the key technologies is the bottle bottom detection which affects the speed and accuracy of the system. It includes positioning and defect recognition of bottle bottom. For the problems such as the slow detection speed and low detection precision of bottle bottom detection, some new methods are proposed in this paper. The positioning algorithm of the bottle bottom in images is studied after preprocessing the obtained images, and the accurate positioning is achieved by improving the Randomized Hough transform. In the defect recognition of bottle bottom, a method of calculating optimum radius in Fourier spectrum is used to solve the problem of the detection accuracy being influenced by the antiskid veins of bottle bottom. It can improve the recognition accuracy effectively. Experiments show the methods proposed in this paper can effectively improve the precision and speed of the bottle bottom detection. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3341
Volume: 11
Issue: 10
Page: 5571-5578
Publish at: 2013-10-01

An Architecture to Implement Event-Driven Web Monitoring Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2740
Gao Ying , Mu Lei , Hao Zhonghu , Zheng Weiyang
Traditional monitoring systems are based on C/S mode because desktop software still has inherent advantages though desktop software is replaced by web applications rapidly in many fields. Meanwhile, traditional monitoring systems use relational database as data source, however, relational database lacks the ability to process influx of queries per second. In this paper, we will do an in-depth research to design an architecture to implement event-driven web monitoring systems. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3466 
Volume: 11
Issue: 10
Page: 6068-6073
Publish at: 2013-10-01

Lightning Performance and its Prevention for Quadruple-circuit Transmission Line with 220kV/110kV Voltage in a Tower

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2711
Li Chunhua , Wang Weiran , Su Jie , Li Tao
According to the physical process of discharge development of insulator that is struck by lightning, the lightning flashover model for quadruple-circuit transmission line with dual voltage 220kV/110kV in same tower is established basing on EMTP. The actual evaluation index of lightning protection performance is adopted with the consideration of influence of system voltage. The characteristics of multi-circuit trip-out simultaneously for mixed-voltage lines in same tower is studied, and the distinctions of lightning protection performance caused by differentiated configuration mode of lightning protection measures including phase sequence arrangement, coupling ground wire and so on. The results indicate that the lightning withstand level fluctuates approximately with the phase angle in the form of non-standard sinusoidal wave. The lightning withstand level emerges as optimum performance under the completely reversed phase sequence. The effect of coupling ground wire on top of tower is superior to that on bottom. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3413
Volume: 11
Issue: 10
Page: 5833-5841
Publish at: 2013-10-01

Research on an Improved Wireless Sensor Networks Clustering Protocol

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2729
Zheng-Qiu Lu , Lin-Ge Wang , Jin Shan
Energy consumption of clustering routing protocol is one of the exigent problems needs to solve in wireless sensor networks. Aiming at the uneven energy consumption and unreasonable cluster heads selection in LEACH protocol, a new clustering routing protocol is proposed in this paper including number of cluster heads, cluster head choosing algorithm and network topology. Finally we give some analysis and comparison between the improved protocol and other two protocols, and the results show that the improved protocol can increase node energy-efficiency and prolong network survival lifetime. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3431 
Volume: 11
Issue: 10
Page: 5980-5985
Publish at: 2013-10-01

The Research of Power plant Operating Data Based on Real-time Digital filtration technology

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2742
Zhao Ming , Yan Zhengbo , Zhou Liukun , Wang Huijie , Xu Xiaogang
Real-time monitoring of the data of the thermal power plant is the basis of accurate analyzing thermal economy and accurate reconstruction of the operating state. Due to noise is inevitable, we need real-time monitoring data filtering to get accurate information of units and equipment in the operating data of thermal power plant. Real-time filtering algorithm can’t be used to correct the current data with future data. Compared with traditional filtering algorithm, there are a lot of constraints. First-order lag filtering method and weighted recursive average filtering method can be used for real-time filtering. This paper analyzes the characteristics of the two filtering methods and applications for real-time processing of the positive spin simulation data, and the thermal power plant operating data. The analysis revealed that the weighted recursive average filtering method applied to the simulation and real-time plant data filtering achieved very good results. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3468
Volume: 11
Issue: 10
Page: 6080-6086
Publish at: 2013-10-01
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