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Jonny Herwan,Takashi Misaka,Seisuke Kano,Hiroyuki Sawada,Yoshiyuki Furukawa,Oleg Ryabov 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.3
Grey cast iron (GCI) is the most common metal casting product in the world. Therefore, achieving sustainable production for this particular material will provide a significant impact on the sustainability issue of metal industries in general. This paper attempts to enhance the sustainability of grey cast iron turning through a high speed, dry turning process. The effect of cutting parameters on three assessments of product sustainability index (PSI) called energy consumption (EC), tool cost (TC), and surface roughness (SR) was investigated using the Taguchi method. The analysis of the signal to noise (S/N) ratio shows that the minimum depth of cut (0.1 mm) gives the optimal performance for all three assessments. Meanwhile, the cutting speed and feed rate reveal a conflict in obtaining the best performance. To help with making a decision, a Taguchi-based Bayesian optimization method was proposed and the capability of the method on suppressing the number of samples to obtain the optimum cutting parameters was demonstrated. Furthermore, the reasons for the optimum cutting condition were also presented.
Realizations of a single phonetic variable prime age-related lexical processing
Jonny Kim,Katie Drager 한국언어과학회 2020 한국언어과학회 학술대회 Vol.2020 No.10
In Exemplar Theory, speech perception is informed by any sorts of frequently experienced co-variance between functionally relevant nodes, including those formed through socially-conditioned lexical use. Accordingly, previous research demonstrated that words associated with a particular age group are recognized faster when they are produced by talkers from that age group. While such effects arose from multiple socially-indexed sub-phonemic cues (e.g, voice quality, pronunciation styles), a phonetic priming experiment reported here tested whether exposure to a single phonetic variant is sufficient to guide probabilistic inference for socially-conditioned words. In each trial, participants (N=40) heard two female talkers (age: 40, 41) producing a priming word, the initial stop of which was acoustically manipulated in VOT and F0 dimensions into either of two age-related realizations (i.e., young vs. old guises) based on an ongoing sound change of phrase-initial stops in Seoul Korean. The priming word was followed by a lexical decision task in which listeners pressed a button indicating whether the auditory stimulus produced in the same voice was a real word. As a result, reaction times for young-associated words (e.g., notap, ‘no solution’) were shorter when the target appeared after the prime word with the young guise than old guise, and vice versa for old-associated words (emem, ‘mother’). The results suggest that phonetic, lexical, and social cues are so closely tied as storage information within the lexicon that a subtle auditory input that may not explicitly activate listeners’ awareness of talker age difference can directly index words associated with similar social information.
김정윤(Kim, Jonny Jungyun),강은지(Eunji Kang) 한국음운론학회 2021 음성·음운·형태론 연구 Vol.27 No.2
This study presents the results from an auditory analysis of younger Korean speakers’ production of three different double consonant clusters, /lk, lm, lp/ in syllable-final position of 16 monosyllabic word stems. When coda simplification occurred conforming to the syllable structure of Korean, /lk/ and /lp/ were mostly realized as [l], the first liquid element (C1), whereas few [C2] tokens occurred. In addition, a substantial amount of [C1C2] realizations were identified, indicating the possibility of ongoing sound change towards either [C1] or [C1C2]. Importantly, the degree of [C1C2] realizations was conditioned by both the type of C2 and prosodic factors. Clusters were faithfully realized in the order of [lp], [lm], and [lk], suggesting that articulatory effectiveness and sonority serve as licensing conditions. As an effect of prosodic position, [lm] and [lk] clusters tended to be simplified to [l] phrase-initially, which we interpret as a syntagmatic effect. An effect of contrastive focus was also found for [lk], increasing the degree of [C1C2] realization. Implications for the relationship between variant choice and prosodic motivation are discussed.
김형목,Jonny Rutqvist,배위섭 한국자원공학회 2014 Geosystem engineering Vol.17 No.5
CO2-EOR is considered as a promising solution for enhanced oil recovery (EOR) and is attracting attention as being a more economical CO2 geological sequestration solution along with oil recovery enhancement. However, injecting CO2 at high pressure may cause many geomechanical changes and potential instabilities in surrounding formation such as ground uplift, caprock fracturing, and nearby fault reactivation. Such instabilities could significantly influence the stability of both surface facilities and subsurface structures. Especially, miscible CO2-EOR, by which recovers more oil than immiscible one but, uses less CO2, requires an injection pressure exceeding the minimum miscible pressure (MMP), which is determined by characteristics of reservoir conditions and oil compositions. Thus, for successful and safe CO2-EOR operation, injection pressure interval between MMP and the maximum pressure that could be tolerated from geomechanics safety concerns should be appropriately designed considering site-specific reservoir conditions. In this study, we perform a numerical simulation of coupled multiphase fluid flow and geomechanical analysis using TOUGH-FLAC simulator for the potential CO2-EOR site in Indonesian oil field, and demonstrate how much fault reactivation is sensitive to fault structure, slip-weakening property of faults, reservoir permeability, and in situ stress conditions. The model site consists of impermeable shale and permeable sandstone reservoir units so that the potential for fault slip through this multilayered formation is highlighted in the simulations. Our simulation results showed that fault slip initiation can be reached earlier period when in situ stress is anisotropic and reservoir is more permeable, because the stress state at the faults is near the frictional strength limit and the pore pressure buildup reaches to the fault much faster. The analysis shows that multilayered formations with high- and low-permeability layers are advantageous in CO2-EOR since intense pore pressure buildup and subsequent fault reactivation could be impeded by pressure dissipation in high-permeability layers. However, we noted that fault reactivation may become substantial when the fault has a slip-weakening property and the residual frictional coefficient of the site-specific fault is very low.
복공식 압축공기에너지 지하암반 저장공동내 기밀라이너 시공효과의 수치해석적 검증
김형목,류동우,Jonny Rutqvist,박도현,송원경 한국자원공학회 2012 한국자원공학회지 Vol.49 No.2
In this study, we carried out numerical modeling to investigate the impact of air tight liner within the concrete linings of underground lined rock cavern for compressed air energy storage (CAES). For the numerical modeling, TOUGH-FLAC that can simulate coupled non-isothermal multiphase (air and groundwater) fluid flow and geomechanical behavior of both concrete linings and rock mass as well as within the cavern, was used. The calculated results of pressure, temperature and stress for two different lining options with and without impermeable inner liner showed that the installation of an inner air tight liner reduced the maximum effective tensile stress of the concrete linings which results in the increase of geomechanical stability as well as air tightness performance of the storage cavern. 본 연구에서는 수치해석을 통해 복공식 지하 압축공기에너지 암반 저장 공동의 콘크리트 라이닝 내부에 설치되는 비투과성의 기밀라이너의 시공효과를 검증하였다. 수치해석기법으로는 저장공동 내부, 콘크리트 라이닝 및 주변 암반에서의 압축공기 및 지하수 유동, 열전달, 역학적 변형의 복합 거동을 시뮬레이션할 수 있는 TOUGH-FLAC 연계해석을 이용하였다. 저장공동 내부에 기밀라이너 시공유무에 따른 콘크리트 라이닝 내 압력, 온도, 응력 계산결과를 비교․분석한 결과, 비투과성의 기밀라이너는 저장 압축공기의 누출을 방지하는 기밀성능 뿐만 아니라 콘크리트 라이닝 내 인장응력을 감소시켜 역학적 안정성을 증대하는 효과가 있는 것으로밝혀졌다.