http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Remarks on /h/ in Old English Phonology
( Jaehyeok Choi ) 대한영어영문학회 2020 영어영문학연구 Vol.46 No.3
In this study, I investigate phonological changes of /h/ from Proto-Germanic to Old English. First, I describe general phonetic features of [h] and then examine the phonological history of /h/ from Proto-Germanic to Old English with special attention to its origin and the allophonic distribution and positional changes of the sound. In addition, I examine the role of /h/ as a conditioner for phonological changes like Old English Breaking as a way to understand phonetic or phonological features of /h/. According to the traditional view, Breaking was caused by velar [x]. However, in early Old English, [x] had already shown the tendency to delete before Breaking. As Howell (1991) rightly pointed out, /h/ is not a velar but a glottal which has some back feature. In other words, this kind of glottal back feature is a decisive factor to cause Breaking. Therefore, it is appropriate to claim that /h/ triggering Old English Breaking is viewed not as a velar but as a glottal fricative. (Mokpo National University)
Phase-Rotator-Based All-Digital Phase-Locked Loop for a Spread-Spectrum Clock Generator
Jaehyeok Yang,Joon-Yeong Lee,Sun-Jae Lim,Hyeon-Min Bae IEEE 2014 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.61 No.11
<P>A phase-rotator-based all-digital phase-locked loop for spread-spectrum clock generation is presented. It combines a dual-tone triangular and a random modulation profile to achieve a balance between electromagnetic interference reduction and broadband jitter generation. The test chip, fabricated using a 90-nm CMOS process, achieves a 43-dB total EMI reduction at the resolution bandwidth of 100 Hz without incurring a notable bit-error-rate penalty at the receiver's side and consuming only 15.8 mW at 6 GHz from a 1-V supply.</P>
Acquisitionism vs anti-acquisitionism
Jaehyeok Choi 한국음운론학회 2018 음성·음운·형태론 연구 Vol.24 No.1
In this study, I investigate the debate of the locus of linguistic change. For example, Hale (2003) and Reiss (2003) insist that linguistic change only happens during first language acquisition. On the contrary, Sankoff (2005) and Bybee (2007) argue that linguistic change occurs over the lifespans of individuals. Despite the fact that many who have written on the issues discussed in this study have argued that all endogenous linguistic change occurs in the first language acquirer, I have tried to present evidence that this is mistaken, and that change can (but need not necessarily always) occur in an adult grammar, specifically the internal grammar of speakers.
Bayesian estimation of the lethargy coefficient for probabilistic fatigue life model
Jaehyeok Doh,Jongsoo Lee 한국CDE학회 2018 Journal of computational design and engineering Vol.5 No.2
In this study, a model for probabilistic fatigue life that is based on the Zhurkov model is suggested using stochastically and statistically estimated lethargy coefficients. The fatigue life model was derived using the Zhurkov life model, and it was deterministically validated using real fatigue life data as a reference. For this process, firstly, a lethargy coefficient that is related to the failure of materials must be obtained with rupture time and stress from a quasi-static tensile test. These experiments are performed using HS40R steel. However, the lethargy coefficient has discrepancies due to the inherent uncertainty and the variation of material properties in the experiments. The Bayesian approach was employed for esti-mating the lethargy coefficient of the fatigue life model using the Markov Chain Monte Carlo (MCMC) sampling method and considering its uncertainties. Once the samples are obtained, one can proceed to the posterior predictive inference of the fatigue life. This life model was shown to be reasonable when compared with experimental fatigue life data. As a result, predicted fatigue life was observed to signifi-cantly decrease in accordance with increasing relative stress conditions.
Various Aspects and Explanations of English Vowel Reduction
Jaehyeok Choi 한국영어학학회 2019 영어학연구 Vol.25 No.3
Vowel reduction has been treated as a frequent phonological phenomenon in the field of linguistics. Therefore, this particular process has often been investigated in both synchronic and diachronic studies. In a similar way, this current research explores various aspects of vowel reduction process in English within some phonological theory. For instance, many studies over many years have tried to adequately define vowel reduction. In this regard, this study has been trying to show how vowel reduction should be defined in terms of phonetic and phonological perspectives. To bring out this result, various factors for vowel reduction were examined. For example, I have shown several potential candidates such as stress, duration, and the interaction between vowel and consonant. In fact, it is suggested that stress is the most influential and important factor for vowel reduction among various conceivable factors.