Amplifier and Driver Circuits for Thin Film Memories with 15 Nanoseconds Read Cycle Time
Amplifier and driver circuit design principles for an experimental 4608-bit nondestructive thin film memory with 13.5-nsec read and 60-nsec write cycle times are given. The bit noise problems inherent in the common bit sense line concept are solved by using tunnel diodes in a nonlinear balancing circuit. A further improvement of the signal-to-noise ratio is achieved by employing a noise resistant sense amplifier with nonlinear negative feedback. The word driver described is capable of delivering 700 ma pulse amplitude at 50 mc repetition rate at a pulse width of 7 nsec.
An experimental 65-nanosecond thin film scratchpad memory system
As computers become larger and more complex, the need for a high-speed scratchpad type memory becomes greater. Furthermore, the size and speed requirements increase. An early memory, suitable for use as a scratchpad, was described by H. Amemiya, R. L. Pryor, and T. R. Mayhew. This memory used two ferrite cores per bit and had a read/regenerate cycle time of 200 nanoseconds. More recently, a 64-word by 20-bit thin magnetic film memory was described by G. J. Ammon and C. Neitzert. This memory had a read/regenerate cycle time of 125 nanoseconds and its speed was limited primarily by the electronic circuitry. A number of other memories and memory designs, suitable for use as scratchpads, have been reported in the literature. Future need for a 256 to 1,024 word memory having a cycle time of 50 nanoseconds has been indicated. A project was therefore initiated to study the feasibility of such a system.
[Effects of dance exercise on exercise intention and exercise-related affect of postmenopausal women].
PURPOSE
A dance exercise program was performed to investigate the effects of exercise on exercise intention and exercise-related affect as these are important determinants of exercise behavior.


METHOD
The subjects were overweight (23< or =BMI< or =25) or obese (BMI> or =25) postmenopausal women (n=14), who participated in an exercise program from May, 2003 through November, 2003 at one public health center located in Kyong-gi Province. Data was analyzed with an SAS PC program.


RESULT
Exercise intention was significantly increased after the exercise program (t=-2.24, P=0.04). Exercise-related affect was also increased, but there was no statistically significant change (t=1.81, P=0.09).


CONCLUSION
This study suggests that exercise participation can increase the level of future exercise behavior by increasing exercise intention and exercise-related affect.