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23,598 Article Results

Hybrid Collision Culling by Bounding Volumes Manipulation in Massive Rigid Body Simulation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2334
Norhaida Mohd Suaib , Abdullah Bade , Dzulkifli Mohamad
Collision detection is an important aspect in many real-time simulation environments.  Due to its nature of high Computation involved, collision detection can contribute to the bottleneck on the system involving large number of interacting objects.  This paper focuses on finding options to efficiently cull away object pairs that are not likely to collide in large-scale dynamic rigid-body simulations involving n-body objects.  The main idea is to perform time critical computing concept by manipulation of potential bounding volume techniques.  In order to take advantage of a fast collision test and a more accurate result, a hybrid collision culling approach based on sphere - or-Dops was used.  Based on initial results, this approach shows a potential adaptation to a massive rigid body simulation. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2656
Volume: 11
Issue: 6
Page: 3115-3122
Publish at: 2013-06-01

Group Interaction Method Based on Wireless Sensor Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2369
Wu Qun , Zhou Haojie , Bi Xiangang
This paper presents a group interaction method based on Wireless Sensor Network which supplies new attempts and ideas for human-computer interaction. Firstly, analyze group interaction framework that is different from the monomer interaction, then integrate data language of group interaction based on user’s purpose so that the Wireless Sensor Network technology and methods are applied to the system of group interaction. Finally, group interaction toys based on Wireless Sensor Network are developed. Each of toy monomers is compactly filled with sensors, wireless communication devices, LED lights. The Wireless Sensor Network which is composed of many monomers makes interface function come true in virtual. The users not only act on the physical object but also act directly on the "data" when they use the device. Currently the functions including light transmission and light color blending have been accomplished and developing. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2700
Volume: 11
Issue: 6
Page: 3361-3366
Publish at: 2013-06-01

Low Complexity Selective Adaptive Multicarrier DS-CDMA Receiver

10.12928/telkomnika.v11i2.933
Ahmed El-Sayed; German University in Cairo El-Mahdy , Maged; MTC, Kobry Elkoba Ahmed
In this paper, selective adaptive (SA) receiver for Multicarrier Direct Sequence Code Division Multiple Access (MC DS-CDMA) system is presented. This receiver has high performance and at the same time reduces the multiple access interference (MAI) of the MC DS-CDMA) system with low computational complexity. The performance of SA receiver is measured in terms of the bit error rate (BER). An upper bound expression of the BER for the SA receiver under Rayleigh fading channel condition is derived and validated by computer simulations. Moreover, the implementation complexities of the SA receiver is compared with the Adaptive Parallel Interference Cancellation (APIC) receiver. 
Volume: 11
Issue: 2
Page: 321-330
Publish at: 2013-06-01

N-tangle of the Superposition of Greenberger-Horne-Zeilinger States

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2377
Xiu-Li Tu , Ting Zhang , Xian-Ming Wang , Xin-Wei Zha
In the paper, use the n-tangle, as a measure of entanglement to investigate the superposition of Greenberger-Horne-Zeilinger states for even n qubits. The paper show that orthogonal basis with the GHZ state can be divided into two group via SLOCC –invariant. In the same group, an expression for any two superposed state is provided, when the superposition coefficient is real, the n-tangle of superposed state is invariable. Otherwise, In the different group, which can get a different expression if the superposed state come from different group. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2718
Volume: 11
Issue: 6
Page: 3422-3426
Publish at: 2013-06-01

Attack and Vulnerability Penetration Testing: FreeBSD

10.12928/telkomnika.v11i2.942
Deris; University of Sriwijaya Stiawan , Mohd. Yazid; Universiti Teknologi Malaysia Idris , Abdul Hanan; Universiti Teknologi Malaysia Abdullah
 Computer system security has become a major concern over the past few years. Attacks, threats or intrusions, against computer system and network have become commonplace events. However, there are some system devices and other tools that are available to overcome the threat of these attacks. Currently, cyber attack is a major research and inevitable. This paper presents some steps of penetration in FreeBSD operating system, some tools and new steps to attack used in this experiment, probes for reconnaissance, guessing password via brute force, gaining privilege access and flooding victim machine to decrease availability. All these attacks were executed and infiltrate within the environment of Intrusion Threat Detection Universiti Teknologi Malaysia (ITD UTM) data set. This work is expected to be a reference for practitioners to prepare their systems from Internet attacks.
Volume: 11
Issue: 2
Page: 399-408
Publish at: 2013-06-01

Influencing Factors of Breaking Capacity of Double-Break Vacuum Circuit Breakers

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2305
Shengwen Shu , Jiangjun Ruan , Daochun Huang , Gaobo Wu
Using a series arrangement of two vacuum interrupters (VIs) has been proved to be an effective way of developing higher voltage vacuum circuit breakers (VCBs), which are known as double-break VCBs. The uniform distribution of the transient recovery voltage (TRV) across each VI is very critical for the breaking capacity of double-break VCBs. In this paper, the TRV distribution characteristics of double-break VCBs was studied by the synthetic test and the PSCAD/EMTDC simulation based on a vacuum arc interruption model. The results show that the bias of the TRV distribution ratio is caused by the stray capacitance and the imbalanced post arc plasma characteristic in each VI, which is consistent with the theoretical analysis. Moreover, the negative effect of grading capacitors was discussed. The results show that it is advisable to limit the value of grading capacitors to those ranges which can guarantee sufficiently improve the voltage distribution.DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2140
Volume: 11
Issue: 6
Page: 2903-2911
Publish at: 2013-06-01

Research and Design on Navigation Electronic Map System

10.12928/telkomnika.v11i2.927
Wanwu Li; Shandong University of Science and Technology Wanwu Li , Lin; Shandong University of Science and Technology Liu , Honglei; Shandong University of Science and Technology Dai , Chang Qu; Shandong University of Science and Technology Chang Qu , Xiaotong; Shandong University of Science and Technology Yang
This paper puts forward the new definition on the basis of the original concept of the navigation electronic map, designs the structure of the navigation electronic map system which contains three parts: hardware equipment, data system and software system, and analyzes each part of them in detail, finally this paper discusses the functional framework of the navigation electronic map.
Volume: 11
Issue: 2
Page: 285-290
Publish at: 2013-06-01

Performance of Channel Estimation in MIMO-OFDM Systems

10.12928/telkomnika.v11i2.937
Subuh; Politeknik Negeri Semarang Pramono , Eddy; Politeknik Negeri Semarang Triyono
 This paper presented the performance of faded channel estimation method on orthogonal frequency division multiplexing-multiple input multiple outputs (OFDM-MIMO) i.e. least squares (LS) and minimum mean squared error (MMSE). Channel impuls response (CIR) was  required to overcome the intersymbol interference (ISI). Channel impuls response information was obtained from channel estimation processing. Iterance simulation used monte-carlo technique to determine the performance of bit error rate (BER) and mean squared error (MSE). Simulation results show that the mean squared error performance on MIMO system was better than the SISO system. On MMSE channel estimation, the MIMO 2Tx-2Rx system provided ± 2 dB improvement that compared to SISO system at value of MSE 10-2.Furthermore,MIMO 3Tx-2Rx produce improvement about 1.5 dB, MIMO 4Tx-2Rx improve about 3.5 dB at BER 10-4,respectively.The MIMO 2Tx-2Rx system, MMSE channel estimation produced better performance ± 1 dB than LS channel estimation with sufficient SNR value for MSE 10-2 .Pilot arrangement, the simulation results show that the block type-pilot arrangement produced better performance than the comb type-pilot arrangement at fast fading channel. Block type-pilot arrangement system produced better ± 10 dB than the comb type-pilot arrangement with MMSE method at value of BER 2 10-2. 
Volume: 11
Issue: 2
Page: 355-362
Publish at: 2013-06-01

Towards Building Web Based Augmented Reality Application for Pre-School Children

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2337
Sule Tekkesinoglu , Mohd Shahrizal Sunar , Cik Suhaimi Yusof
The goal of this work is to present a concept for web based Augmented Reality. We have many examples of Augmented Reality systems in different field from military applications to medical applications, from entertainment to manufacturing. In this paper we worked on how virtual environments can be combined with web based applications. Internet users need web sites for many reasons in daily life. On the other hand, Augmented Reality is one of the popular fields on virtual environment technologies that it would be useful to associate these two technologies. In this study JavaScript were used as main language to build Augmented Reality application supported by three different libraries each with a specific role. The libraries which are used through coding are Flartoolkit, Papervision3D, and Flex SDK. The outcome of this combined algorithms shows that the method is accomplished web based Augmented Reality for preschool children to provide educators a way to teach students with deeper, and more meaningful experiences in the academy. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2659
Volume: 11
Issue: 6
Page: 3134-3141
Publish at: 2013-06-01

Formula Expression of Airgap Leakage flux Coefficient of Axial-Flux Permanent Magnet Motor

10.12928/telkomnika.v11i2.912
Xiao; Shandong University Gong , Yanliang; Shandong University Xu , Feng; Shandong Supervision and Inspection Institute for Product Quality Xin
Airgap leakage flux coefficient is one of the main parameters which must be given ahead of time when performing initial designs or getting performance results by magnetic circuit analysis for any kinds of electrical machines. Three -dimensional finite element method (3D-FEM) is the most reliable one to obtain the accurate leakage flux coefficient for axial-flux permanent magnet (AFPM) motor which definitely takes a much long time and is not advantageous to the motor’s initial and optimal design. By constituting the accurate lumped-parameter magnetic circuit (LPMC) model and computing the resultant magnetic reluctances, the analytical formula of the leakage flux coefficient of AFPM is given which is verified by 3D-FEM and the prototyped AFPM experiment. 
Volume: 11
Issue: 2
Page: 241-248
Publish at: 2013-06-01

Acoustic Performance of Exhaust Muffler Based Genetic Algorithms and Artificial Neural Network

10.12928/telkomnika.v11i2.931
Bing; Huaihai institute of technology Wang , Xiaoli; Huaihai institute of technology Wang
 The noise level was one of the important indicators as a measure of the quality and performance of the diesel engine.Exhaust noise in diesel engines machine accounted for an important proportion of installed performance exhaust muffler and it was an effective way to control exhaust noise. This article using orthogonal test program for the muffler structure parameters as input to the sound pressure level and diesel fuel each output artificial neural network (BP network) learning sample. Matlab artificial neural network toolbox to complete the training of the network, and better noise performance and fuel consumption rate performance muffler internal structure parameters combination was obtained through genetic algorithm gifted collaborative validation of artificial neural networks and genetic algorithms to optimize application exhaust muffler design is entirely feasible.
Volume: 11
Issue: 2
Page: 313-320
Publish at: 2013-06-01

Bursty Hot-Words Detection for Campus BBS

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2348
Geng Changxin , Zhu Xiaoguang , Nie Peiyao , Lin Peiguang
In the monitoring of campus public opinions, hot words often reflect the latest burst hot topics within a certain period of time. Therefore, this paper takes in-depth research for bursty hot words detection. In the process of words weight calculation, we consider not only traditional features such as TF, IDF, but also the burstiness, part of speech, length, location in text and other factors. Consequently, the measurement formula of burstiness and the weight calculating formula based on symphysic multi-features are proposed. The weight calculating formula can identify the bursty hot-words quickly and accurately, and then discover the bursty events, finally realizing the early warning of campus public opinions effectively. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2671
Volume: 11
Issue: 6
Page: 3213-3219
Publish at: 2013-06-01

The Improvement of Chord Protocol about Structured P2P System

10.12928/telkomnika.v11i2.941
Yong; Chongqing University of Posts and Telecommunications Chen , Long-zhao; Chongqing University of Posts and Telecommunications Sun , Huan-lin; Chongqing University of Posts and Telecommunications Liu , Wei-zhong; Chongqing University of Posts and Telecommunications Xiao
Chord protocol is one of the most classical protocols in structured P2P system, with the good effect, reliability, high query efficiency, and many other advantages. However, Chord agreement remains two main shortcomings the one that the searching speed of resources is slower, and the other that the detention of routing is higher. This paper in view of these shortcomings, combination with modification, then put forward the new Chord structure that super nodes and common nodes coexist, super nodes management general nodes. The new structure using Zipf-law determines the proportion of super nodes and ordinary nodes. The last, the new structure is simulated by simulation software, and the improved Chord protocol make better the previous shortcoming through the new structure compares with the Chord protocol.
Volume: 11
Issue: 2
Page: 393-398
Publish at: 2013-06-01

Wind Powered Sprinkler System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2328
Chin Jung Huang
Due to limited energy resources, excessive emission of CO2, global warming, increase of mean temperature, serious impacts have resulted on our living environment, and thus, energy saving and carbon reduction have become urgent issues. Planting grass, flowers and trees can absorb and reduce CO2, thus meeting the requirements for energy saving and carbon reduction in environmental protection. At present, most of lawns or gardens in Taiwan are maintained by manual or traditional semiautomatic watering device. Whether the lawn needs to be watered and the amount of water to be sprinkled depends on subjective decision. When the lawn is watered without examining the moisture content of the soil beforehand, it causes waste of time, labor, water and cost. The intelligent wind powered watering system developed by this study used an electromechanical integrated design system to control the humidity probe, and used the electricity generated by natural wind power and pumping device to control the sprinkling action. This system sprinkles water by sensing the soil moisture content, and stops sprinkling automatically when the soil moisture content is enough, thus achieving the purposes of cost and energy saving. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2641 
Volume: 11
Issue: 6
Page: 3080-3086
Publish at: 2013-06-01

Reseach of Control System of Packaging Machine on PLC

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2325
Xiao SUN , Hao ZHOU , Xiangjiang LU , Yongbin LIU
An automatic control system of sampling package for sample coal is designed according to the realities of sample coal powdery materials which are based on controller (PLC). The system can realize the functions of random sampling, auto-weighting, auto-packaging, and auto-sealing off. It also can adjust waste less, control convenient, zero point self-tuning and dynamics weighing measurement. It can be used in sampling weighing package of sample coal. Various performance indicators can be stably and reliably used in field. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2614
Volume: 11
Issue: 6
Page: 3060-3065
Publish at: 2013-06-01
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