M. S. Tong

The Baroque music's influence on learning efficiency based on the research of eye movement

The study takes “the stimulation of Baroque music on learning efficiency” as the object. The subjects eye movements can be gained in the experiments including Schulte grid, finding differences, and reading scientific literature. By analyzing the trajectory with Baroque musical background or not, we study the variation of the subjects abilities of attention, observation and memory. We find that, compared to with no musical background, the subjects trial duration and average fixation duration decrease, the average saccade amplitude increase with musical background. Baroque music can stimulate the increase of learning efficiency.

Accurate solution of electromagnetic scattering by very thin conducting objects

Solving electromagnetic (EM) scattering with very thin conducting objects by integral equation approach have to deal with some unfavorable problems, such as a large dynamic change of current density in the neighborhood of their edges and many low-quality meshes on the side faces of objects in geometric discretization, which makes the accurate evaluation of singular integrals in matrix elements significant. To overcome the above problems, we use the electrical field integral equation (EFIE) as a governing equation and develop an efficient method of moments (MoM) solver for the problems based on a singularity treatment technique without subdividing triangular patches. A typical numerical examples is presented to demonstrate its robustness.

Frequency-coded chipless RFID tag based on spiral resonators

RFID has been widely used around the world and it is necessary and effective to lower the cost of RFID by removing inside chip. A novel frequency-coded chipless RFID tag is presented in this paper. It encodes data into the spectral characteristic by spiral resonators with different structures. The tag with six resonators can produce totally 64 IDs and each tag has its unique ID decided by unique size of spiral resonators. Some experiments have been implemented and the results show that tag has obvious frequency characteristic and can be accurately detected by reader. Results prove that this novel chipless tag has excellent performance in information coding.

A slot UHF RFID tag antenna with a shorted stub for application to metallic objects

In this paper, a novel low-profile RFID antenna is proposed. Based on original microstrip patch antenna, the tag antenna adopts a shorted stub and H-shape slot. Implementing a shorted stub can easily match the impedance of RFID chip. Using H-shape slot increases the length of current path on patch, miniaturizing the tag antenna. The size of the proposed antenna is 62 × 18 × 0.79mm3 and its simple structure ensures the easy and low-cost fabrication. The simulated impedance bandwidth (return loss ≤ -10 dB) is around 64MHz both in free space and on metallic objects. The calculated reading distances are about 3m in free space and 4m on metal.

Electromagnetic analysis of tunable bandpass filters with a magnetodielectric perturber

Electromagnetic (EM) analysis is performed for a tunable bandpass filter with a magnetodielectric perturber controlled by a piezoelectric transducer. The structure includes a perturber as a superstrate which consists of thin ferrite film with a high permeability and Rogers dielectric material with a high permittivity in a sandwich style. The structure is of multiscale feature because the thickness of the thin film is very small but cannot be ignored. The problem can be solved by surface integral equations (SIEs) in the integral equation approach, but the conditioning of system matrix may not be good. We use volume-surface integral equations to formulate the problem in this work and the disadvantage of SIEs can be overcome. A numerical example is presented to illustrate the approach.

On the point-matching method for solving electromagnetic radiation problems

Point-matching methods like boundary element method (BEM) or Nyström method have been widely applied to solve electromagnetic problems. The merits of such methods include simple mechanism of implementation, removal of basis and testing functions, and low requirement on mesh quality due to the permission of nonconforming meshes. However, the methods are primarily used to solve scattering problems so far and they are seldom employed for radiation problems yet. The main concern for radiation problems is how to apply an excitation. Unlike the method of moments with the Rao-Wilton-Glisson (RWG) basis function in which a delta-gap source can be applied over a common edge of RWG triangle, we cannot do so in the point-matching methods. In this work, we use the combined field integral equation (CFIE) as a governing equation and investigate the approach of applying an excitation in the point-matching methods. It is found that using a magnetic frill source as an excitation is a good solution as demonstrated by a typical numerical example.

Construction and validation for a PSoC wireless transmission system

With the rapid development of intelligent monitoring today, we have applied numerous sensors in monitoring the target area, but the problem of energy consumption has always been difficult to solve. Because of the large number of wireless sensor network node, the supplement of node energy trapped, so its imperative for us to consider the design of low-power system. In this paper, we used the PSoC4 BLE (Bluetooth Low Energy) architecture of CYPRESS corporation to construct a multi-nodes communication network based on the BLE technology and an improved location RSSI (Received Signal Strength Indication) algorithm.

Design of a data playback module for Very Long Baseline Interferometry

With the development of VLBI technology, the correlator system of observation station is constantly upgrading, so as to adapt to new data format and higher processing speed. Now the conversion of data format from Mark 5B to VDIF has been built by the researchers around the world. Once completed, it will be conducive to VLBI international collaboration. Hence it is very meaningful to study the VDIF. In VLBI system, data preprocessing must be completed by the VLBI data playback module before correlation. In this paper, a new design for a VLBI data playback module is proposed and corresponding simulations are performed to verify the results.

Transient analysis for electromagnetic scattering by dielectric objects based on PMCHWT equations

Transient electromagnetic scattering by dielectric objects is formulated through time-domain Poggio-Miller-Chang-Harrington-Wu-Tsai (TDPMCHWT) equations which are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. The space-domain MoM requires two basis functions to represent the electric and magnetic current densities, respectively, and its implementation may not be convenient. Also, the MoT scheme has a well-known late-time instability problem which will aggravate in the surface integral equations of dielectric media. We present a different approach to solve the TDPMCHWT equations by incorporating the Nyström method in space domain and a Galerkin method with Laguerre basis and testing functions in time domain. The approach presents certain merits compared with the conventional method as demonstrated by a numerical example.

Time-domain analysis for transient electromagnetic scattering by conducting-dielectric objects

Transient electromagnetic (EM) scattering by conducting-dielectric objects is formulated by time-domain electric field integral equations (TDEFIEs). The TDEFIEs are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. The space-domain MoM requires two basis functions to represent the electric and magnetic current densities on material interfaces, respectively, leading to an inconvenience in implementation. Also, the MoT scheme has a late-time instability problem which will aggravate in the surface integral equations with penetrable media. In this work, the TDEFIEs are solved by a different approach in which the Nyström method is used to discretize the space domain while the Galerkin method with Laguerre basis and testing functions is employed to discretize the time domain. The proposed approach can overcome the defects of conventional approach as demonstrated by a numerical example.