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담화성분 기반의 한국어 화행 분류를 통한 텍스트 의도 파악의 모호성 해소: 전산언어학적 접근
조원익(Cho, Won Ik),김남수(Kim, Nam Soo) 담화·인지언어학회 2019 담화와 인지 Vol.26 No.3
In this paper, we apply the concept of rhetoricalness and intonation-dependency on the syntax-semantic property ‘discourse component’, to propose a speech act-level categorization for spoken Korean in text form. By this, we primarily aim to make up a non-domain-specific speech act typology that requires less burden in annotation, which also resolves the vagueness in understanding human speech and eventually satisfies the boosting demand for the analysis and understanding of spoken language in speech-based AI services. We constructed the resource for quantitative analysis by annotating 6K Korean utterances, and based on it, via a recurrent neural network-based evaluation, implicitly observed that the proposed speech act typology has consistency in the way it categorizes the utterances. The corpus and trained models are to be distributed online for research purpose.
펄스형 Nd:YAG 레이저와 단락이행모드의 직류 GMA 열원을 이용한 하이브리드 용접 공정에 대한 연구
조원익,나석주,Cho, Won-Ik,Na, Suck-Joo 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.6
Until now, many researches on laser-arc hybrid welding processes have been conducted mainly for high power CW laser and high direct current arc to weld the thick steel plates for shipbuilding. Recently, however the usage of thin steel plates, which tend to be deformed easily by thermal energy, is been increasing because of demand of light structure such as car body in the automobile industry. Accordingly, heat sources having relatively low heat input such as pulsed laser, dip-transfer DC GMA and pulsed GMA seem to be applied more increasingly and the study about those heat sources is needed more intensively. Any heat source mentioned above can not stand alone without weld defects at a relatively high welding speed for increasing the welding productivity. This is main reason to apply the hybrid welding process which uses pulsed laser and low-heat-input GMA heat sources simultaneously to weld the thin steel plate. In this study, parameters of pulsed laser and dip-transfer DC GMA welding are studied firstly through preliminary experiments, and then analyzed in the viewpoint of their physical phenomena. Before conducting the hybrid welding, a pulse control technique is developed based on the parallel port communication and Visual C++ 6.0. Owing to development of this technique, interactions of laser and arc pulses can be controlled consistently. Using the pulse control technique, the hybrid welding is conducted and then its interactive welding phenomenon is analyzed.
레이저-GMA 하이브리드 용접에서 유동에 의한 기포 및 기공 형성 해석
조원익,조정호,조민현,이종봉,나석주,Cho, Won-Ik,Cho, Jung-Ho,Cho, Min-Hyun,Lee, Jong-Bong,Na, Suck-Joo 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.6
Three-dimensional transient simulation of laser-GMA hybrid welding involving multiple physical phenomena is conducted neglecting the interaction effect of laser and arc heat sources. To reproduce the bubble and pore formations in welding process, a new bubble model is suggested and added to the established laser and arc welding models comprehending VOF, Gaussian laser and arc heat source, recoil pressure, arc pressure, electromagnetic force, surface tension, multiple reflection and Fresnel reflection models. Based on the models mentioned above, simulations of laser-GMA hybrid butt welding are carried out and besides the molten pool flow, top and back bead formations could be observed. In addition, the laser induced keyhole formation and bubble generation duo to keyhole collapse are investigated. The bubbles are ejected from the molten pool through its top and bottom regions. However, some of those are entrapped by solid-liquid interface and remained as pores. Those bubbles and pores are intensively generated when the absorption of laser power is largely reduced and consequently the full penetration changes to the partial penetration.
펄스 GMA 위빙 용접에서 그루브형상에 따른 아크특성에 관한 연구
최광덕,조원익,김철희,나석주,Choi, Kwang-Deok,Cho, Won-Ik,Kim, Cheol-Hee,Na, Suck-Joo 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.4
In this paper, arc characteristics of V groove joints using pulsed GMA welding were found out. The bevel angles of $22.5^{\circ}$ and $30.0^{\circ}$ were chose to make the V groove configuration with the groove angles of $45^{\circ}$ and $60.0^{\circ}$, respectively. In the experiment, the arc current waveform measurement and the high speed photography were taken to investigate the arc characteristics for a single-beveled asymmetric workpiece. Consequently, the welding current was changed abnormally around the edge of groove. As the arc moved close to the groove face, the welding current was increased rapidly because the welding arc was affected by the inclined surface. Also the welding current waveforms were measured for the double-sided symmetric workpiece to verify the previous measurements for the single-beveled workpiece, and similar current waveforms were found.