Abstract: It is determined whether phase noise and parasitic oscillation take place on the basis of a carrier-to-noise (C/N) ratio calculated with amplitudes in an amplitude direction of signal points of a reception signal and a C/N ratio calculated with amplitudes in a phase direction of the signal points of the reception signal. Further, when it has been determined that phase noise and parasitic oscillation take place, an alarm is displayed on a screen. When it has been determined that phase noise and parasitic oscillation take place, the phase of a demodulation circuit is compensated based on the detected phase noise.

Abstract: An inhibiting agent against the proliferation of tumor cells comprises a lower condensation polymer or oligomer of an .alpha.-hydroxy acid, an oligopeptide containing at least one pyroglutamic acid residue, and a stabilizer. The lower condensate and the lower polymer of an .alpha.-hydroxy acid comprise mainly compounds formed by condensing and polymerizing 2 to 10 molecules of an .alpha.-hydroxy acid and their metal salts. The weight ratio of the components is such that the ratio of the lower condensate and the lower polymer of an .alpha.-hydroxy acid is 10, the ratio of the oligopeptide containing at least one pyroglutamic acid residue is 1 to 4, and the ratio of the stabilizer a saccharide or a sugaralcohol comprising is 1 to 3.