Chunhua Hu

An approach to generate software test data for a specific path automatically with genetic algorithm

We focus on software reliability with testing coverage, which will grow with increment of the coverage. We expect to improve quality of software testing with it automated. An approach of generating test data for a specific single path is presented in this paper, different from the predicate distance applied by most test data generators based on genetic algorithms. A similarity between the target path and execution path with sub path overlapped is designed as fitness value to evaluate the individuals of a population and drive GA to search the appropriate solutions. Several experiments are taken to examine the effectiveness of the designed fitness function, which evaluate performance of the function with the convergence ability and consumed time. Results show that the function performs well compared with other two typical fitness functions for specific paths.

Design and analysis of a transcutaneous telemetry device for brain stimulator

This paper proposes a transcutaneous bidirectional telemetry solution using resonant electromagnetic coupling and pulse interval modulation for low power loss and high performance in neuro-stimulator. The resonant electromagnetic coupling model is established on the base of resonance electromagnetism theory, and relationships between coupling coefficient, displacement tolerance, resonance frequency and telemetry distance are studied experimentally. One air-core coil is used as a time-shared transmitter and receiver antenna for controller, and one ferrite-core coil is used as the counter part for implantable device, which decreases the volume of the implantable part. Experiments verified that the average power consumption was about 33 uW for implantable part in this device under the testing condition of over 10cm telemetry distance between the implantable part in titanium container and controller. Simultaneously, telemetry device is with good displacement tolerance.

Development of a uni-acupoint transcutaneous electric nerve stimulation device for electroacupuncture-like neuromodulation.

Abstract Transcutaneous electric nerve stimulation (TENS) targeting at certain acupoints can be deemed as variation of electroacupuncture (EA) with the key advantage of non-invasiveness. However, existing operations of TENS usually involve placing at least two electrodes separately to form the electric circuit. To disentangle the concurrent stimulation of multiple sites and investigate the necessity of acupoint specificity on the basis of the traditional acupuncture theory, we developed a uni-acupoint TENS device aiming at performing non-invasive EA-like neuromodulation. It consists of a concentric anode-cathode arrangement with a maximal outer diameter of 32 mm integrated with a stimulating current generator. Once applied, it delivers square wave pulse trains with adjustable parameters (pulse form, intensity, frequency and width), and only a tiny area enclosing the selected acupoint would be electrically activated with no other acupoint of meridian affected. A simulated driving experiment was also carried out to verify the devices efficacy when conducting stimulation solely at the acupoint Neiguan (PC 6) to withstand driver fatigue. The results suggest that the device facilitates the application of effective EA-like stimulation with its most unique advantages of acupoint specificity and non-invasiveness.

A new respiratory training system for astronauts

More and more astronauts and common people will be sent to space. When going to space from the earth or return to the earth from space in a spaceship, especially in emergency, men will suffer from hyper-gravity. Hyper-gravity can induce much sickness, and endanger the life of human. Respiratory training in advance can help astronauts to tolerate much higher gravity values. A new respiratory training system was developed for astronauts. The system can be well worked for astronauts now.

An Automatic Testing System for Implantable Pulse Generator (IPG)

The quality of implantable pulse generator (IPG)-the primary component of most implantable medical devices (IMDs)-is of vital importance. Hence, it is imperative to have accurate tests for IPG to ensure its high reliability and safety. This paper presents the design and application of an automatic testing system capable of running automatic tests for the hardware and software of IPG by way of calibrating pulse output, calculating power consumption, checking wireless communication function, examining electric neutrality and testing transaction between different IPG states. Structure of the system is introduced firstly, followed by the test strategy which is divided into two steps: testing all parameters in a fixed state and testing all transaction paths between different states. Subsequently, dozens of IPG tests are taken to evaluate the performance and stability of the testing system. In contrast to manual testing, results show that the system enhances the quality and efficiency remarkably and is able to pick out both IPG hardware malfunctions and software bugs.