A new method is proposed to increase the resonant frequency of a Capacitive Micromachined Ultrasonic Transducer (CMUT) device while keeping the radii unchanged for devices fabricated by sacrificial release (SR) method. The resonant frequency of a CMUT cell is determined by the properties of the membrane such as the Young’s modulus, membrane dimensions and effective membrane mass. Effective Young’s modulus is used to calculate the resonant frequency of CMUT fabricated by SR method. The supporting post structure will affect the boundary conditions at the edge of the CMUT membrane and in turn affect the deflection together with the effective Young’s modulus of the membrane. The perturbation method is used to derive the solution for the governing von Kármán equations. The results show that the thicker is the supporting post width, the higher is the resonant frequency. This method can also be used to simplify the mask design and CMUT fabrication process.

Classical data fusion methods can be roughly divided into two categories: one is based on random methods, such as weighted average, least squares, Kalman filtering, Bayesian estimation, DS evidence inference, and production rules; the other is based on artificial intelligence. Intelligent methods include fuzzy logic reasoning, artificial neural networks, and support vector machine methods. This paper introduces, analyzes, and summarizes the advantages and disadvantages of the above methods, as well as the level of use of these methods, and then introduces the current trend of data fusion technology toward the mixed development of multiple methods. This article is aimed at carrying out a research on the innovation of Wushu Sanda teaching mode in colleges and universities based on multisensor data fusion technology. This article puts forward the innovative theory of youth sports training in Sanda in the new era, combined with the current status of physical education in Chinese colleges and universities, and analyzes the practicality of the theory and the effect of system integration. This article accelerates reforms and collects data from four aspects: the policy system at the macro level, the integrated governance system at the meso level, the teacher service system at the micro level, and the digital industry system at the functional innovation level, and proposes innovative strategies for youth sports training and teaching in the new era. The results of the study show that people with 5.99 are more interested in the World Cup, accounting for the largest proportion, while the number of people who are interested in martial arts is the least, only 1.63. The innovative theory of youth sports training in Sanda in the new era improves the training effect of students by 60% compared with ordinary college Sanda training. It can to a large extent protect students from reluctant exercises that do not receive physical education in traditional teaching. Physiologically, it has unique advantages for the development of students. The teaching innovation model of this article can effectively solve the problems of physical education organization difficulty.

Today, with the gradual improvement of material living standards, basketball is becoming more and more popular, and the pursuit of sports protection and shoes performance is also getting higher and higher. A good pair of basketball shoe soles can help athletes solve these problems. This article is aimed at studying the preparation of basketball shoe soles made of high resilience and nonslip composite materials. Under this research topic, this paper proposes a method for the design of shoe sole antislip pattern and the measurement method of composite material’s resilience performance and a 3D printing method based on FDM technology to print the shoe sole. At the same time, an experiment was designed to explore the high resilience and antislip performance of the sole. And the stability of printing technology is analyzed to ensure the quality of sneaker printing. The experimental results in this article show that the antislip performance of the sole printed by the above method design has been improved by 31%, and the rebound capacity has been improved by 44%. At the same time, the rebound time is significantly shorter than that of several common basketball shoes on the market.

高校普遍存在实验室资源配置重复、使用率低、专业实训教师短缺等问题.文章借鉴欧洲"流动制"教学方式与经验,提出建立校际共享实验教学中心.该中心充分发挥各校的优势实验教学平台和资源,建立共享机制与互认机制,配备专业实训教师,如此便能让学生能够充分享用优秀教育资源,以大力提升大学毕业生社会竞争力和高校办学实力.

With the development of integrated circuits and microelectronics, integrated and miniaturized implantable medical devices are increasingly used in modern medical technologies, e.g., cardiac pacemakers, vasodilators, and cochlear implants. However, the normal operation of these devices is inseparable from the availability of sufficient energy supply and the bidirectional transmission of internal and external signals. Due to the limitation of the working environment of sensors, there is only a small space for most implanted electronic devices, which is a challenge faced by existing technology. In this paper, current wireless implantable energy supply and communication technologies are reviewed to determine the best available technologies, thereby providing a reference for method selection in designing implantable medical systems.

Objective: The aim of this research was to study the channel transmission characteristics of living and dead animal bodies and signal path loss characteristics of implantable communication in the axial direction. Methods: By injecting fentanyl citrate injection solution, we kept the research object (a piglet) in a comatose state and then a death state, so as to analyze the channel characteristics in each state. To analyze channel gain when using an implantable device with a fixed implantation depth and varying the axial distance, we proposed an implantable two-way communication path loss model. Results: Comparing the living-body and dead-body results showed that the channel gain difference was approximately 10dB for the same position and distance; heartbeat, pulse and breathing of the living animal contributed approximately 1dB of noise. Analyzing the calculated and experimental results of the path loss model showed that the determination correlation coefficients of the model were 0.999 and 0.998, respectively. The model prediction result and the experimental verification result also agreed closely. Conclusion: The path loss model not only fits the experimental results, but also has better predictability for those positions not measured.

伴随着IT和AI的迅速发展,提供一个能共享各类教育资源、终身学习的智慧教育平台的需求越来越迫切.对目前国内外的各类智慧教育平台发展现状的分析基础上,以模块化组件方式建构了四层基于智慧教育的共享资源平台.在DAAS层建立智慧生态共享资源库,为学习者提供共享式的终身学习资源,实现教育资源的优化配置并高效共享;在SAAS层建立了智慧教学服务、智慧管理服务和智慧教育学习圈服务,为学习者提供更有效的互动交流和智慧学习方式.

针对人工智能技术的快速发展和国家对人工智能人才培养的快速推进,根据地方高校的特点,分析了目前地方高校人工智能人才培养发展现状和存在的问题.并根据这些问题逐一提出了解决方案和实施措施.以期让地方高校能结合自身特色与地方特点,形成起以学生为中心,加强自身优势发展,以特色专业建立地方特色经济的人才培养方案,管理模式和教学运行机制.为国家及地方产业智能升级,智能科技稳步健康持续发展提供人才保障.

Mobile cloud computing is an emerging field that is gaining popularity across borders at a rapid pace. Similarly, the field of health informatics is also considered as an extremely important field. This work observes the collaboration between these two fields to solve the traditional problem of extracting Electrocardiogram signals from trace reports and then performing analysis. The developed system has two front ends, the first dedicated for the user to perform the photographing of the trace report. Once the photographing is complete, mobile computing is used to extract the signal. Once the signal is extracted, it is uploaded into the server and further analysis is performed on the signal in the cloud. Once this is done, the second interface, intended for the use of the physician, can download and view the trace from the cloud. The data is securely held using a password-based authentication method. The system presented here is one of the first attempts at delivering the total solution, and after further upgrades, it will be possible to deploy the system in a commercial setting.

With progress in science and technology and the rapid development of the Internet of Things, we have entered the intelligent era of the Internet of Things. With many devices connected to the Internet, hackers have opportunities to attack; thus, the security of the Internet of Things has attracted increased attention. In the era of big data, the demand for information storage is increasing. This paper considers block chains and proposes an ECC (Ellipse Curve Cryptography) asymmetric algorithm to encrypt information. For storage, this paper proposes compressed sensing for data compression reconstruction to improve information storage speed in the Internet of Things. The experimental results show that the proposed algorithm is superior to comparable algorithms in security and storage performance.

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With the development of microelectronics and sensor technologies, implantable electronic devices are employed in many applications. These devices are distributed on or in the human bodies and are used to transmit signals wirelessly to external equipment. In conventional wireless communications, the antennas need a lot of space and power, and their strong electromagnetic interference limits the available locations for implantable devices. In the more recently developed galvanic coupling intra-body communication technology, human tissues are used as the media of signal transmission, and this method has therefore been applied to resolve the spatial limitations of conventional wireless communications methods. This paper presents a mathematical model of multi-layer galvanic coupling based on the volume conductor theory to analyze the transmission mechanism of these implantable intra-body communication devices. The proposed model is based on the quasi-static approximation conditions of Maxwell's equations, the field and potential are solved from Poisson's equation, and an equation was obtained to model the channel attenuation. The channel gain in a model of human limbs can be used to calculate within the frequency range of lesser than 1 MHz. To verify the accuracy and applicability of the model, the computed results were compared with the physiological saline and porcine tissue experimental results in the 100-kHz frequency.

To study the signal transmission mechanism in the human body, the channel characteristics are generally analyzed by modeling. In current modeling methods, the human body is considered quasi-static and the human tissues isotropic, for simplifying the model and its calculation; however, this does not consider the effect of the human tissues on electric signal transmission, resulting in considerable deviations between the calculated results and the measured values. To reduce model errors and improve precision, a channel modeling method with human muscular-tissue characteristics is proposed in this study. In this method, Maxwell's equations is used as the governing equation and a galvanic-coupling intra-body communication channel model with human-tissue characteristics is built in the cylindrical coordinate system. By building a numerical model with the same parameters as in the analytical model, the analytical solution is proved to be correct. By comparing the different-sample anisotropic models and the isotropic models with the experimental results, it is concluded that the anisotropic model with muscular-tissue characteristics is superior to the isotropic model without muscular-tissue characteristics, with respect to the curve variation tendency and error between the model calculations and the experimental results. The precision of this anisotropic model is enhanced by 200%; hence, it is more accurate. At last, in order to study the optimal communication frequency of the channel, we select 50 healthy persons as the subjects of this experiment, we find that the optimal communication frequency band of the human arm is 10 kHz to 50 kHz. Within this frequency band, the channel gain is the largest, and the mean deviation of samples is less than 2dB, which is very beneficial to signal transmission in human body.

The paper presented 2GHz -18GHz conformal end-fired monopole log-periodic antenna array on metal cylinder. The monopole log-periodic antenna has a simple feed network, which uses slot microstrip lines as the feed network. The monopoles are designed on both sides of the copper substrate according to certain rules. We proposed 2G-18GHz conformal monopole log-periodic antenna array that consists of a metal cylinder, a fixed antenna metal inverted cone, and twelve monopole log-periodic antenna arrays. Two types monopole log-period antenna arrays conforming to a metal cylinder consisting of a 2GHz-6GHz monopole log-periodic antenna array unit and a 6GHz-18GHz antenna unit 30 degrees evenly placed in a wedge-shaped groove of a metal cylinder. The test results from the 2GHz-18GHz end-fire antenna array are available. The conformal end-fired antenna array has good end-fire radiation characteristics.

In this paper, the filtering property of the terahertz waveband based on one-dimensional photonic crystal was studied and preliminary theoretical exploration for the two-dimension case is carried out. The effect of the lattice imp erfection lay ers' refractive index upon the center frequency and intensity of the defect mode's transmission p eak was deep ly analy zed. It is p roven that tuning the transmission frequency of the Terahertz wave can be accomplished by changing the incident angle of the Terahertz wave or altering the refractive index and width of the defect layers; changing the defect layer number can realize multi-channel filtering and tuning of the Terahertz wave. Thus they can be applied to design of the Terahertz optical switch. Finally, the electro-optical crystal Lithium Niobate and the ferroelectric liquid crystal material (FLC) are taken as the defect layer of the photonic crystal to design the Terahertz optical switch and the multichannel filter. Optical switch control within a tunable frequency band of 100G can be achieved by using them.

A broadband high-gain periodic endfire antenna is presented in this article. The broadband is achieved by using a planar out-of-phase power divider with ultra-wideband performance and periodic dipole elements. The device uses two substrates with a common ground plane. A coupling between two microstrip lines on the top and bottom substrate layers through a slot in the common ground plane, and a transition from two microstrip lines to a parallel stripline are used to achieve an ultra-wideband operation. The gain enhancement is achieved by loading with an I-shape resonator (ISR) structure in the endfire direction. The effect of the I-shape unit cell structure on the gain enhancement is investigated. Both the ISR-loaded antenna and unloaded one are fabricated to verify the predictions. The measurements show that ISR-loaded antenna presents gain of about 7 dB-10 dB in the whole working band (3GHz-11GHz), which is about 2 dB-3.5 dB more than the unloaded one. The proposed antenna can be using in wireless communication systems for its advantages of broad bandwidth and high-gain.

A novel wideband periodic endfire antenna is presented. Broad bandwidth is realized by using a parallel strip line (PSL) feed and dipole elements. A coupling between two microstrip lines on the top and bottom substrate layers through a slot in the common ground plane, and a transition from two microstrip lines to a parallel stripline are used to achieve an wideband operation. The regular dipole shape is modified to a quasi-rhombus shape by adding two triangular patches. Using two dipoles helps maintain stable radiation patterns close to their resonance frequencies. A modified array configuration is proposed to further enhance the antenna radiation characteristics and usable bandwidth. The proposed antenna provides endfire radiation patterns with high gain, high front-to-back (F-to-B) ratio,wide beamwidth in a wide bandwidth of the 130%

A gain enhancement wideband Quasi-Yagi elliptic dipole antenna is presented in this letter. The gain enhancement is achieved by loading with spliting-ring resonator (SRR) structures in the endfire direction while broad bandwidth is realized by using a microstrip-to-coplanar balun and elliptic dipole elements. The measurement results show the SRRs-loaded antenna presents around 5GHz-8GHz dB gain in the whole working band (5GHz-11GHz), which is around 2 dB more than the unloaded one. This antenna can be used in wireless communication systems for its advantages of broad bandwidth, endfire radiation and high gain.

This paper presents the design and implementation of a novel wide bandwidth end fire antenna with log-periodic directors. The feeding structure of the proposed antenna includes a balun which is formed using a pair of microstrip to slot line transitions. The proposed antenna has three resonant frequencies in the operating frequency band. Both simulation and measurement results show that the operating frequency band of the antenna for S11 <; -10 dB covers the wide bandwidth (5GHz-10GHz), and the relative bandwidth is 67%. Far field measurements in azimuth plane and elevation plane show that the radiation patterns are stable and end fire within the operating band at frequencies of 5GHz, 7GHz, 8GHz, 10GHz. The proposed antenna radiates a well defined end fire beam, with a front-to-back ratio > 20dB and cross polarization level below -29dB. The dimension of the proposed antenna is 26mm × 27mm. Good return loss and radiation pattern characteristics are obtained and measured results are presented to validated the usefulness of the proposed antenna structure for wide bandwidth end fire applications.

This paper proposed a novel 100% bandwidth end-fire log-periodic monopole antenna array that can cover the wide bandwidth from 6GHz to 18GHz. The proposed log-periodic monopole antenna array removed the complicated feeding network in the design of the conventional log-periodic monopole antenna array, and corrected the errors discussion in design of the log-periodic monopole antenna array that is not formed the cross-inverting feeding on the ground plane. The proposed log-periodic monopole antenna uses the slot line as feed circuit to achieve the cross feed on the ground plane while keeping the symmetry of the antenna structure. The proposed antenna can keep good end-fire radiation over the whole operational frequency (6GHz-18GHz). The proposed log-periodic monopole antenna array has a compact size(45mm× 30mm × 12mm).