[Quantitative ultrasonic naked gene delivery and the effect control].

Objective: To study ultrasonic naked gene delivery and its effect control, and to investigate the new methods, which are easy-to-use, reliable and non-cytotoxic for application in gene therapy so as to build an optimal parameter set.

Method: Suspensions of different kinds of cells were exposed to calibrated ultrasound field (35.1 kHz) with different parameters for gene delivery.

[A multifrequency phase-controlled driving system for ultrasound therapy].

Ultrasound therapy is a new type of therapy technology, there are hyperthermia and high intensity focused ultrasound surgery (HIFUS). Compared with a single frequency system, mutiple frequency system has an additional function to combine power patterns of different frequencies. This function increases the availability of power patterns to treat tumors of various shapes and depths.

[A video communication system for telemedicine].

In this paper, point to point video communication system based on internet is deeply studied. Meanwhile the application system designed practically is introduced. It is emphasized that video compression coding based on low bit rate stream with ITU-T H.