Biomedical subjects

Shangkai Gao

Publications and source records attributed to Shangkai Gao.

5 recordsLinked to original sources

PubMed2003

The application of the generalized vector sample pattern matching method for EIT image reconstruction.

This paper presents a new application of a generalized vector sample pattern matching (GVSPM) method for image reconstruction of conductivity changes in electrical impedance tomography. GVSPM is an iterative method for linear inverse problems. The key concept of the GVSPM is that the objective function is defined in terms of an angular component between the inner product of the known vector and solution of a system of equations. Comparisons are presented between images of simulated and experimental data, reconstructed using truncated singular value decomposition and GVSPM. In both cases, a normalized sensitivity matrix is constructed using the finite volume method to solve the forward problem.

Artifacts↗

PubMed2003

A BCI-based environmental controller for the motion-disabled.

With the development of brain-computer interface (BCI) technology, researchers are now attempting to put current BCI techniques into practical application. This paper presents an environmental controller using a BCI technique based on steady-state visual evoked potential. The system is composed of a stimulator, a digital signal processor, and a trainable infrared remote-controller. The attractive features of this system include noninvasive signal recording, little training requirement, and a high information transfer rate. Our test results have shown that this system can distinguish at least 48 targets and provide a transfer rate up to 68 b/min. The system has been applied to the control of an electric apparatus successfully.

Algorithms↗

PubMed2003

[Design and realization of HL7 gateway].

With the development of the technology in medical informatics area, Health Level Seven (HL7) Standard for electronic data exchange in all healthcare environments has become a widely used standard. To bring it into practice in China, we developed an HL7 gateway. The gateway is used to connect two different medical information systems, a Hospital Information System (HIS) and a Laboratory Information Management System (LIMS), via the HL7 message exchanging. The system verified the feasibility of HL7 standard and made a good example for further research and development.

Computer Communication Networks↗

PubMed2002

Design and implementation of a brain-computer interface with high transfer rates.

This paper presents a brain-computer interface (BCI) that can help users to input phone numbers. The system is based on the steady-state visual evoked potential (SSVEP). Twelve buttons illuminated at different rates were displayed on a computer monitor. The buttons constituted a virtual telephone keypad, representing the ten digits 0-9, BACKSPACE, and ENTER. Users could input phone number by gazing at these buttons. The frequency-coded SSVEP was used to judge which button the user desired. Eight of the thirteen subjects succeeded in ringing the mobile phone using the system. The average transfer rate over all subjects was 27.15 bits/min. The attractive features of the system are noninvasive signal recording, little training required for use, and high information transfer rate. Approaches to improve the performance of the system are discussed.

Activities of Daily Living↗

PubMed2002

[Temporal-spatial analysis of evoked potentials].

Evoked potentials are widely used in clinical neurophysiology. The conventional analysis methods of evoked potentials are based on the waves in time domain. Analysis based on time-spatial domain will provide more information than simple time domain analysis. The existing temporal-spatial analysis methods, such as microstate, frequency domain analysis and event-related coherence, are introduced in this paper.

Evoked Potentials↗