A Study for the Characteristic Frequency of Korean Disyllabic Word List / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: Speech audiometry is a useful test for obtaining practical information which could not be gotten from the pure-tone audiometer test. Nowadays, Hahm's Korean disyllabic word lists are the most commonly used word lists for the speech reception threshold test in Korea. The disyllabic word lists should be composed of spondaic words (equally stressed words). The aim of this study is to evaluate the characteristic frequency of Hahm's disyllabic word lists. SUBJECTS AND METHOD: Two of the Hahm's disyllabic word lists were evaluated. The word lists were analyzed using an acoustic analysis program that has the MATLAB function. RESULTS: The percentage of disyllabic words in the Hahm's disyllabic word lists that had the spondaic words pattern were 33%. The characteristic frequencies of these words were equally stressed above 1,000 Hz. Other disyllabic words showed an unequally stressed pattern. The percentage of words that had the first syllable stressed pattern was 31% and the percentage of second syllable stressed pattern was 36%. CONCLUSION: Some words, which are commonly used in the Hahm's disyllabic words lists, had an unequally stressed pattern. A new Korean dissyllabic word list needs to use more balanced words that have the characteristic frequency of each word.

Electrophysiological Properties of Frequency Domain in Rats' Skeletal Muscle / 中国运动医学杂志

Objective To study the electrophysiological properties of rat skeletal muscle within the frequency from 100Hz to 100MHz.Methods The AC impedance of rat sural muscle tissues was measured using the Agilent 4294A impedance analyzer, then the electrophysiological properties of the normal rat sural muscle cells were established in the respect of cell dielectric spectroscopy, Cole-Cole plots, spectrum of loss factor and loss tangent.Results (1) The dielectric response of rat sural muscle cells was frequency-dependent, such as increase in frequency caused decrease in permittivity. At the same time the conductivity trended to arise; (2) The dielectric parameters(?_L,?_h,?_L,?_h,△?″_ max,△tg?_ max,f_ C1,f_ C2) cell fiber parallel to the applied electric field differed from that cell fiber perpendicular to the applied electric field; (3) The effect of alternating current electric field on rat sural muscle cells showed a dielectric dispersion phenomenon, representing two characteristic frequency: the 1 st frequency(f_ C1(∥)=f_ C1(⊥)=1.02 kHz) and 2 nd frequency(f_ C2(∥)=59.31 kHz,f_ C2(⊥)=380.04kHz). Conclusion The method for studying the electrophysiological properties of rat skeletal muscle cells was established in the respect of the frequency domain,providing a possibility for investigating muscle fatigue in the future.