Showing papers by "Government of Canada published in 1978"
TL;DR: The formation and characterization of narrow-band-waveguide reflection filters in Ge-doped silica optical fibers is described, which can have complex response profiles and are tunable in frequency by mechanical strain.
Abstract: The formation and characterization of narrow-band-waveguide reflection filters in Ge-doped silica optical fibers is described. The filters can have complex response profiles and are tunable in frequency by mechanical strain.
247 citations
TL;DR: The Mediterranean monk seal population is estimated to be between 500 and 1000 with the population still declining as discussed by the authors, with the majority of the population concentrated in the eastern Aegean sea.
65 citations
TL;DR: It is shown that while FFSK is similar in structure to OK-QPSK, its sensitivity to reference phase error is less and it is shown to require 2.5 dB less receiver phase reference SNR for a specified detection loss than OK-ZPSK.
Abstract: Fast Frequency Shift Keying (FFSK) is a phase coherent binary FSK modulation technique with a deviation ratio of 0.5 and an ideal error rate performance equivalent to that of phase-shift keyed (PSK) modulation. Coherent reception of FFSK and PSK systems is degraded by imperfect receiver reference signals. The various forms of PSK modulation-binary (BPSK), conventional quadriphase (QPSK) and offset quadriphase (OK-QPSK)-as well as FFSK, exhibit the same ideal error rate performance but are not equally sensitive to imperfect carier phase reference. It is shown that while FFSK is similar in structure to OK-QPSK, its sensitivity to reference phase error is less. FFSK is shown to require 2.5 dB less receiver phase reference SNR for a specified detection loss than OK-QPSK.
21 citations
TL;DR: The paper suggests that the designers of today's machine-oriented “ data processing” systems must accept a large share of the responsibility for these problems because the human component, which should be present in every “ informationprocessing” system, had frequently been overlooked.
4 citations
01 Jan 1978
TL;DR: In this paper, the authors focus on reducing the number of accidents and their harmful effects upon individuals and the environment, and the extent of control an individual may exert in protecting himself from a transportation accident.
Abstract: In recent years there has been a growing concern regarding the environment and the quality of life. An important aspect of this concern relates to accidents within transportation systems. It is generally agreed that transportation accidents cannot he completely eliminated, therefore, one must focus instead on reducing the number of accidents and their harmful effects upon individuals and the environment. Another aspect of this problem is the extent of control which an individual may exert in protecting himself from a transportation accident. In this era of mass transit, an individual has only limited control in determining the level of risk in the transportation offering. Therefore, transportation safety, as a major public concern, must be examined within the context of the individual, the environment, and the society.