The Flexible Executive Mindset: How Top Management Should Look at Tomorrow’s Markets

The need for management to better anticipate the future is the urgent message currently being advocated by consultants in strategic market planning. Uses a survey of high-level managers from Fortune 1,000 corporations to illustrate the advantages of cultivating a flexible mindset concerning environmental trends and their strategic marketing implications. Reviews projected developments in the economy, technology, ecology and the social/political environments that are expected to occur by 2005. Discusses appropriate marketing responses to these trends

Performance of a Ka-band satellite system under variable transmitted signal power conditions

A laboratory hardware-based satellite communication system simulator has been used to measure the effects of transmitted signal power changes on the performance of a Ka-band system. Such power changes can be used to compensate for signal fade due to rain attenuation. This paper presents and discusses the results of these measurements

SITE project. Phase 1: Continuous data bit-error-rate testing

The Systems Integration, Test, and Evaluation (SITE) Project at NASA LeRC encompasses a number of research and technology areas of satellite communications systems. Phase 1 of this project established a complete satellite link simulator system. The evaluation of proof-of-concept microwave devices, radiofrequency (RF) and bit-error-rate (BER) testing of hardware, testing of remote airlinks, and other tests were performed as part of this first testing phase. This final report covers the test results produced in phase 1 of the SITE Project. The data presented include 20-GHz high-power-amplifier testing, 30-GHz low-noise-receiver testing, amplitude equalization, transponder baseline testing, switch matrix tests, and continuous-wave and modulated interference tests. The report also presents the methods used to measure the RF and BER performance of the complete system. Correlations of the RF and BER data are summarized to note the effects of the RF responses on the BER

Interference susceptibility measurements for an MSK satellite communication link

The results are presented of measurements of the degradation of an MSK satellite link due to modulated and CW (unmodulated) interference. These measurements were made using a hardware based satellite communication link simulator at NASA-Lewis. The results indicate the amount of bit error rate degradation caused by CW interference as a function of frequency and power level, and the degradation caused by adjacent channel and cochannel modulated interference as a function of interference power level. Results were obtained for both the uplink case (including satellite nonlinearity) and the downlink case (linear channel)

Performance measurements for a laboratory-simulated 30/20 GHz communication satellite transponder

NASA has developed a digital satellite communications system simulator and test bed facility, known as the Systems Integration, Test and Evaluation (SITE) Project. The purpose of the facility is to evaluate satellite system components, develop and verify system concepts, and perform satellite system experiments. A recently completed set of experiments measured the performance of the 30/20 GHz satellite transponder portion of the system in terms of RF parameters and high rate digital data transmission. The results of these tests indicate the quality of data transmission which can be obtained under various transponder conditions, as well as the relative effects of degraded RF performance on the bit-error rate (BER) of transmitted data

A Survey of the Expenditures For and The Practices of Selecting, Purchasing, and Distributing Instructional Materials in Yakima County, Washington

It was the purpose of this investigation to study existing practices of selection, purchasing, and distribution of instructional materials used by the school districts of Yakima County, Washington