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List of Articles
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Open Access Article
1 - A Novel Video Compression Algorithm Using Wavelet Transform and neural network
Mohammad Rahmanian Ahmad Hatam Mohammad Ali ShafieeianVideos are made up of a temporal sequence of frames and are projected at a proper rate to create the illusion of motion. This means that there exists a high correlation between adjacent temporal frames so that when projected at a proper rate, smooth motion is seen. Corr MoreVideos are made up of a temporal sequence of frames and are projected at a proper rate to create the illusion of motion. This means that there exists a high correlation between adjacent temporal frames so that when projected at a proper rate, smooth motion is seen. Correlation between adjacent temporal frames is called interframe correlation. In order to decode compressed video bit stream uniformly by various platforms and devices, the bit stream format must be predefined. Thus, there must be a standard for a video compressor, which will enable all standard-compliant compressed video data to be decoded anywhere. The goal is to propose a new video compression algorithm based on wavelet transform and neural networks. Using wavelet transform leads to factorization in temporal as well as spatial domain. The goal in this paper is to achieve a compression algorithm which would be faster and has more compression ratio. Neural networks are used for prediction which is one of the most important functions in any video compression scheme. Furthermore, the proposed algorithm is compared with MPEG standard. Simulation results show the befits of using wavelet transform which reveal that the proposed algorithm is faster and has better performance in some aspects compared to MPEG standard. The video which obtained from proposed algorithm has acceptable in human visual and since it needs less than space for storing, it is suitable for portable devices. Manuscript profile -
Open Access Article
2 - Design and Simulation of a Compact UWB MIMO Antenna with Mutual Coupling Reduction
Narges Malekpour Mohammad Amin Honarvar Abdolmehdi DadgarpourIn this paper, A compact multiple-input-multiple-output (MIMO) antenna with a small size of 26×31mm2 is proposed for portable ultrawideband (UWB) applications. The antenna consists of two square-monopole antenna with microstrip-fed by a 50- Ω printed on one side o MoreIn this paper, A compact multiple-input-multiple-output (MIMO) antenna with a small size of 26×31mm2 is proposed for portable ultrawideband (UWB) applications. The antenna consists of two square-monopole antenna with microstrip-fed by a 50- Ω printed on one side of the substrate. To enhance isolation and increase impedance bandwidth, two long ground stubs are added to the ground plane on the other side. Simulation is used to study the antenna performance in terms of reflection coefficients at the two input ports, coupling between the two input ports, radiation pattern, realized peak gain, efficiency and envelope correlation coefficient. Results show that the MIMO antenna has an impedance bandwidth ( for S22< -10 dB) of larger than 3.1–10.6 GHz, low mutual coupling ( for S21< 3 dB) of less than -16 dB, and a low envelope correlation coefficient of less than 0.003 across the frequency band, making it a good candidate for portable UWB applications. Manuscript profile -
Open Access Article
3 - Adaptive Dynamic Surface Control is designed for Twin Rotor unmanned helicopter in three-dimensional space
Amir Reza Moadeli Khoshnam Shojaee Afshin EtesamiIn this paper, the system control design problem twin rotors helicopters Unmanned Aerial Vehicles (UAV) in three dimensional space Without uncertainty based on the dynamic adaptive control is studied. the adaptive Dynamic surface control approach complexity explosion pr MoreIn this paper, the system control design problem twin rotors helicopters Unmanned Aerial Vehicles (UAV) in three dimensional space Without uncertainty based on the dynamic adaptive control is studied. the adaptive Dynamic surface control approach complexity explosion problem in non-linear control step back or backstepping method [45] using the First-order filters removed. The first helicopter dynamic equations and functions are examined. Then, the Dynamic surface control techniques by compare non-linear control technique back stepping [45] is checked and the system is simulation by both techniques adaptive Dynamic surface control and nonlinear control back stepping method. The proposed adaptive dynamics surface nonlinear control method approach is able to guarantees that all the signals in the closed-loop system are asymptotically stable for all initial conditions and you can also choose appropriate design parameters of the system output converges to a small neighborhood of origin ensured . Finally, simulation results are presented, showing the effectiveness of control methods are given. Manuscript profile -
Open Access Article
4 - Design and Simulation of a Sample of Integrated Broadband Antenna and Omni-Directional for Marine Floats
Maisam Vaheb Ali Hashemi Hossein Emami Mahdi EmamiNowadays one of the specialized and important issues in construction of marine floats is to design the communication telecom system between them. Always this issue has been posed how to establish an appropriate communication for floats in different distances and differe MoreNowadays one of the specialized and important issues in construction of marine floats is to design the communication telecom system between them. Always this issue has been posed how to establish an appropriate communication for floats in different distances and different weather conditions in the sea. Due to the restrictions, such as equipment size, weight bearing on the floats has always existed.One of the main parts of telecom communication system is antenna.The main problem, use antennas and Towers various in floats, As required, waves with different wavelength sand different routes to be published. If the antenna can be designed with small dimensions and possible,wide frequency range and also covered omni-directions, the problem has been mentioned above somewhat is resolved. The purpose of this paper is to design and simulate of a sample of integration broadband antenna and omni-directional, that resolve About restrictions above and Integration of two antennas in frequency range of VHF/UHF=150-450MHZ and HF=3-30MHZ with characteristics of 50ohm input impedance, linear vertical polarization, VSWR<2.5, antenna gain ranges between (-12)dBi to (4.8)dBi, the maximum antenna diameter of 18cm, and the maximum height of opened antenna of 538.2cm. Manuscript profile -
Open Access Article
5 - Impact of Sink Node Placement onto Wireless Sensor Networks Performance Regarding Clustering Routing and Compressive Sensing Theory
Shima Pakdaman Tirani Avid AvokhWireless Sensor Networks (WSNs) consist of several sensor nodes with sensing, computation, and wireless communication capabilities. The energy constraint is one of the most important issues in these networks. Thus, the data-gathering process should be carefully designed MoreWireless Sensor Networks (WSNs) consist of several sensor nodes with sensing, computation, and wireless communication capabilities. The energy constraint is one of the most important issues in these networks. Thus, the data-gathering process should be carefully designed to conserve the energy. In this situation, a load-balancing strategy can enhance the resources utilization, and consequently, increase the network lifetime. Furthermore, recently, the sparse nature of data in WSNs has been motivated the use of the compressive sensing as an efficient data gathering technique. Using the compressive sensing theory significantly leads to decreasing the volume of the transmitted data. Taking the above challenges into account, the main goal of this paper is to jointly consider the compressive sensing method and the load-balancing in WSNs. In this regards, using the conventional network model, we analyze the network performance in several different states. These states challange the sink location in term of the number of transmissions. Numerical results demonstrate the efficiency of the load-balancing in the network performance. Manuscript profile -
Open Access Article
6 - Design and Simulation of a Low-Noise Amplifier (LNA) with low power consumption and high gain in 2.4GHz frequency for wireless systems
Esmaeel Karimi Ebrahim BorzabadiAbstract: This paper presents the design and simulation of low-noise amplifier (LNA) with .18CMOS technology in 2.4GHz frequency addressed, the process HSPICE RF simulation software has been done. Using cascode structure leads to lower power consumption with higher volt MoreAbstract: This paper presents the design and simulation of low-noise amplifier (LNA) with .18CMOS technology in 2.4GHz frequency addressed, the process HSPICE RF simulation software has been done. Using cascode structure leads to lower power consumption with higher voltage gain and power gain. Matching network was used in the design of this circuit has a very good improves on the parameter S11 and allows to have a good control on the real part of the impedance of circuit by appropriate selection of matching network in input and output. By right choosing of circuit elements in this structure can have an approllllojjpriate compromise among the circuit parameters like noise figure, gain, power and stability to reaching noise figure (NF), input reflection coefficient and low power consumption with high gain. In the 2.4GHz frequencyl with 1.8V supply voltage and 1.9 mW power consumption, the circuit parameters are: NF=1.21dB, Av=28.dB, S11=-29.25dB, S12=-35.49dB, S21=18.46dB Manuscript profile
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