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Implantable CPW fed M Shaped Antenna for Biomedical Applications
Kazal Kumar Saha,
Sohrab Hossain Razu,
Diponkar Kundu
Issue:
Volume 7, Issue 2, April 2019
Pages:
42-45
Received:
25 February 2019
Accepted:
4 April 2019
Published:
29 April 2019
Abstract: Implantable medical device has become very popular in medical sector for proper diagnosis and treatment. If, this devices are wireless, then it will very effective for remote communication. For this wireless communication, antenna is a suitable thing. So, this paper presents the design Implantable CPW fed M-shaped antenna for biomedical applications. Coplanar waveguide fed technique is used with ground plane in this antenna. The antenna is designed by Alumina ceramic (Al2O3) substrate and Copper ground plane with dimensions (8mm × 7mm × 0.85mm) and Silicon material of 0.1mm thickness is used as a coating for human body safety. This antenna works under 2.42 GHz resonate frequency of ISM band (2.40-2.48 GHz). The bandwidth percent of the antenna at -10dB is 7.66%. The return loss characteristic of the antenna is -56.96 dB. Based on the conductivity and permittivity of different tissue (such as: Muscle, Fat. Skin) a simple 3D human body phantom structure is designed for implantation of CPW fed antenna. The antenna is designed and simulated with the help of CST software. The antenna parameters such as: Return loss, Smith Chart, VSWR, Gain, SAR have been discussed in the paper.
Abstract: Implantable medical device has become very popular in medical sector for proper diagnosis and treatment. If, this devices are wireless, then it will very effective for remote communication. For this wireless communication, antenna is a suitable thing. So, this paper presents the design Implantable CPW fed M-shaped antenna for biomedical application...
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A Survey of Vehicular ad Hoc Network Routing Protocols
Jijin Wang,
Xiaoqiang Xiao,
Peng Lu
Issue:
Volume 7, Issue 2, April 2019
Pages:
46-50
Received:
27 April 2019
Published:
23 May 2019
Abstract: Vehicular Ad-hoc Network (VANET) is an emerging autonomous dynamic topology network. It is a special kind of Mobile Ad-hoc Network in which the vehicles exchange their information with each other. VANET turns every car in it into a mobile node and use these nodes to create a mobile dynamic network. The purpose of VANET is to supply a wireless connectivity and deploy various applications such as collision avoidance, safety and improving the traffic efficiency as provisioned by the Intelligent Transportation System (ITS). The vehicles are constrained by the realistic traffic environment, and now the simulations are mainly network simulations which cannot simulate the real trace of the vehicle. But as nodes in VANETS have very high mobility, so there are lots of challenges to route the packets to there final destination which need to be addressed by existing/proposing new solutions for the same. Keeping view of above, In this paper, We summarize the existing VANET routing protocols and classify and compare them. Then, We list several classic routing algorithms and analyze their characteristics and advantages and disadvantages. Finally, by analyzing the status quo of vehicle-mounted routing protocols, we illustrate the difficulties and challenges that vehicle-mounted routing protocols will encounter in the future.
Abstract: Vehicular Ad-hoc Network (VANET) is an emerging autonomous dynamic topology network. It is a special kind of Mobile Ad-hoc Network in which the vehicles exchange their information with each other. VANET turns every car in it into a mobile node and use these nodes to create a mobile dynamic network. The purpose of VANET is to supply a wireless conne...
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Time Distribution of Reflected Light Signals from Partially Coherent Light Passing Through Complex Optical Systems with Multiple Apertures
Shan Congmiao,
Sun Huayan,
Li Pengwei
Issue:
Volume 7, Issue 2, April 2019
Pages:
51-56
Received:
15 April 2019
Published:
15 June 2019
Abstract: Laser active detection technology scans and detects large target equipped with optoelectronic equipment by transmitting laser beam, converts the received reflected light signal into electrical signal, and obtains target information through various signal processing methods to achieve the goal of target detection. The laser beam output from the high power laser usually has multi-mode structure and partial coherence, and the optical reconnaissance equipment with complex optical structure is an equivalent system with multiple hard edge apertures. In the simulation of the coherent beams transmission through the multi aperture complex optical system, large matrix calculations are required in the spatial optical field computation, which consumes a lot of computation time. Furthermore, the size of the optical receiving lens is far less than the spot size after a long distance transmission, which results in the loss of optical information. To solve the problems, in this article, taking the Gauss Schell model (GSM) beam as a partially coherent light model, based on the Complex Gauss decomposition method for the hard edge diaphragm and ABCD optical transmission matrix, the recursive formula of the time series of the intensity distribution of the coherent GSM beams interference fringe field transmission through a multi aperture complex optical system is derived, and the influences of the spatial coherence of the GSM beam. The effects of the spatial coherence of GSM beams, the initial distance between coherent beams and the equivalent aperture size of complex optical systems on the time distribution of transmitted light intensity are analyzed. According to the results, the influence of the spatial coherence of the GSM beam on the spatial coherence of the beam itself is more obviously than that on the formation of two coherent GSM beam interference field. The interference fringe field spatial distribution and the aperture size are the main factors affecting the transmission of light time distribution. The conclusions obtained in this paper have important reference value for the application of partially coherent optical transmission through complex optical systems, and also provide a new idea for the target echo signal processing method of laser active detection.
Abstract: Laser active detection technology scans and detects large target equipped with optoelectronic equipment by transmitting laser beam, converts the received reflected light signal into electrical signal, and obtains target information through various signal processing methods to achieve the goal of target detection. The laser beam output from the high...
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Study on Factors Affecting Residual Magnetism of Phase Selection of Extreme High Voltage Transformer and Its Calculation Method
Teng Wentao,
Xiang Zutao,
Zheng Bin,
Song Xiuyou,
Zhang Yuanyuan,
Li Kuan
Issue:
Volume 7, Issue 2, April 2019
Pages:
57-63
Received:
20 April 2019
Published:
15 June 2019
Abstract: As one of the core components in the extreme high voltage power grid, the extreme high voltage transformer has a large rated capacity, and the level of magnetizing inrush current generated by the air-to-air transformer is high. At the same time, a large amount of harmonics are injected into the power grid. In severe cases, a long duration and a slow decay can be generated. The voltage has an adverse effect on the near-area grid and equipment (especially power electronics). In order to further improve the safety and reliability of systems and equipment, effective measures need to be taken to suppress them. At present, the measures that can be used to limit the main transformer closing current include the circuit breaker installation closing resistor and the phase selection closing technology. However, since the closing resistance does not exceed 10 ms, it limits the main transformer closing excitation current, harmonics and over The effect of voltage is relatively limited, and the conventional phase-selection closing technology cannot consider the influence of transformer remanence, and its limiting effect is also not ideal. Foreign research and the use of phase-selection closing technology that takes residual magnetism in some ultra-high-pressure projects to solve the problem of air-to-air inrush current has gained some experience. In theory, this measure is expected to solve the extreme high voltage large-capacity transformer very ideally. Inrush current, harmonics, waveform distortion and overvoltage caused by closing. In this paper, the influencing factors of remanence of extreme high voltage transformers in phase-selective switching technology are studied. According to the research results, the specific scheme of voltage integral to measure residual magnetism is established.
Abstract: As one of the core components in the extreme high voltage power grid, the extreme high voltage transformer has a large rated capacity, and the level of magnetizing inrush current generated by the air-to-air transformer is high. At the same time, a large amount of harmonics are injected into the power grid. In severe cases, a long duration and a slo...
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A Design of New Airborne Integrated Alarm System
Jianhua Li,
Jintao Xie,
Xun Li,
Chaogang Hu
Issue:
Volume 7, Issue 2, April 2019
Pages:
64-68
Received:
12 March 2019
Published:
15 June 2019
Abstract: Aiming at the fault alarm requirement of a certain type of aircraft, a new type of airborne integrated alarm system is designed. The system adopts modular design idea, and the acquisition part is composed of multi-slice shift register 54HC165 cascade, which can reduce the number of control pins; the main control part uses the heterogeneous processing scheme of DSP and FPGA, which not only ensures the real-time processing of information, but also enriches the interactive ability of the interface; the output part uses a single FPGA to control the alarm lamp box, giving full play to the system advantages of centralized alarm and hierarchical processing. potential. Ground debugging experiments show that the system can accurately judge the aircraft warning information, and quickly notify the pilot according to the degree of emergency. The scheme is simple to implement, and the interface is scalable, so it has high practical value with strong portability and expansibility.
Abstract: Aiming at the fault alarm requirement of a certain type of aircraft, a new type of airborne integrated alarm system is designed. The system adopts modular design idea, and the acquisition part is composed of multi-slice shift register 54HC165 cascade, which can reduce the number of control pins; the main control part uses the heterogeneous processi...
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An Anti-occlusion Video Target Tracking Method Based on Kalman Filter
Dang Kexin,
Zhang Xiongfei,
Chen Zhihong,
Yang Ziwen,
Li Chen
Issue:
Volume 7, Issue 2, April 2019
Pages:
69-74
Received:
14 April 2019
Published:
15 June 2019
Abstract: The human visual system is the main component of the brain-based information processing system. It is the main way for humans to obtain external information. Therefore, the emerging science represented by computer vision came into being. Video-specific target tracking is a core issue in the field of computer vision research. It has been widely studied and concerned, and it has been widely used in many fields, such as video surveillance, intelligent navigation, medical diagnosis, augmented reality and virtual reality, etc. The specific moving target tracking algorithm and improved algorithm in the video are studied to some extent. Combining the meanshift algorithm with Kalman filtering can solve the occlusion problem of moving targets in complex scenes. This project intends to use Kalman filter and meanshift algorithm to detect and track the specified target in the video image sequence, and obtain the position, angle, scale, velocity, acceleration and dynamic trajectory of the target. Experiments show that this method has a good tracking effect on the target tracking in the video which is partially occluded during the motion.
Abstract: The human visual system is the main component of the brain-based information processing system. It is the main way for humans to obtain external information. Therefore, the emerging science represented by computer vision came into being. Video-specific target tracking is a core issue in the field of computer vision research. It has been widely stud...
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