Telecommunications     

Leland Johnson  Richard H. Baker  David A. Stamper  Masanao Tanase 《Communication Booknotes Quarterly》2013,44(4-5):52-54

TELECOMMUNICATIONS ALTERNATIVES FOR FEDERAL USERS: MARKET TRENDS AND DECISIONMAKING CRITERIA by Leland Johnson et al. (Santa Monica, CA: Rand, R-3355-NSF, 1985—$20.00)

A BIBLIOGRAPHY OF SELECTED RAND PUBLICATIONS (titles as follows—free on request, paper) include SB-1020 on communication satellites (19 pp.)

Rand publications, three recent titles

THE COMPUTER SECURITY HANDBOOK by Richard H. Baker (Blue Ridge Summit, PA: Tab Professional and Reference Books, 1985—$25.00)

BUSINESS DATA COMMUNICATIONS by David A. Stamper (Menlo Park, CA: Benjamin/Cummings Publishing, 1986—price not given)

BEHIND THE TELEPHONE DEBATES 5: INTEGRATED SERVICES DIGITAL NETWORKS (ISDN): CONCEPTS AND ISSUES IN THE U.S. AND JAPAN by Masanao Tanase (Program on Information Resourcews Policy, 200 Aiken, Harvard University, Cambridge, MA 02138—price not given, paper)  相似文献   

The effects of jumping distance on the landing mechanics after a volleyball spike     

Walter Quispe Marquez  Masanao Masumura  Michiyoshi Ae 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):154-166

The purpose of this study was to assess the effects of jumping distance on the landing mechanics after a volleyball spike, to help in injury prevention and training for safer landing. Ground reaction forces and three-dimensional kinematic data were collected from six male university right-handed volleyball players under “Normal” and “Long” jumping distance conditions of landing after a spike. The results revealed that the landings under the Long jumping distance condition produced significantly greater centre of gravity velocities and larger mean loading rates. Although data were collected for bilateral landings with the two feet contacting the force platform at the same time, landing motion was asymmetric and the left leg was considered to play a more critical role in the absorption of the landing impact. The trunk and hip positions at the initial contact with the floor and the range of motions of the knee and ankle were key kinematic parameters for reducing the vertical peak ground reaction forces and extending the time from the initial contact to the occurrence of this peak force, which consequently reduced the mean loading rate upon landing.  相似文献