조선 해양 구조용 강의 용접성

김충명 대한금속재료학회 ( 구 대한금속학회 ) 2000 재료마당 Vol.13 No.1

한국어 문장이해과정에서의 형태통사 및 의미오류의 출현 위치관련 ERP 성분과 그 영역특성

김충명,남기춘 한국언어과학회 2007 언어과학 Vol.14 No.3

The Effect of Heat Input on the Defect Phases in High Frequency Electric Resistance Welding

김충명,김정규 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.1

The effect of the chemical compositions of base material and ERW conditions on defect formation is studied by an analysis of defect formation mechanism and defect phases in variation to heat input and apex angle. In the high heat input range, a comet shape narrow gap is formed due to higher current density and higher Lorentz force at the welding point than at the apex point. The comet shape narrow gap, which has a wider width at the welding point, causes a penetrator rate increase by leading the retardation of sweeping speed of molten metal bridge that discharges the oxides from the narrow gap. The increase of apex angle is very effective in minimize the penetrator defect rate with the optimization of heat input. The oxides in cold weld at low heat input range have an FeO phase, and the oxides in penetrator at high heat input range have an Fe3O4 phase. The reason for the Fe3O4 phase in the penetrators is that the molten metal can be oxidized first on the strip edges, and then the oxidation increase after being discharged from the narrow gap and are refilled into the narrow gap due to the retardation of sweeping speed. Therefore, penetrators have Fe3O4- MnO2 rather than FeO-MnO-SiO2 phases as proposed in previous articles. Mn amount contained in the base material gives a more effective role to the penetrator defect rate than to the Mn/Si ratio. The effect of the chemical compositions of base material and ERW conditions on defect formation is studied by an analysis of defect formation mechanism and defect phases in variation to heat input and apex angle. In the high heat input range, a comet shape narrow gap is formed due to higher current density and higher Lorentz force at the welding point than at the apex point. The comet shape narrow gap, which has a wider width at the welding point, causes a penetrator rate increase by leading the retardation of sweeping speed of molten metal bridge that discharges the oxides from the narrow gap. The increase of apex angle is very effective in minimize the penetrator defect rate with the optimization of heat input. The oxides in cold weld at low heat input range have an FeO phase, and the oxides in penetrator at high heat input range have an Fe3O4 phase. The reason for the Fe3O4 phase in the penetrators is that the molten metal can be oxidized first on the strip edges, and then the oxidation increase after being discharged from the narrow gap and are refilled into the narrow gap due to the retardation of sweeping speed. Therefore, penetrators have Fe3O4- MnO2 rather than FeO-MnO-SiO2 phases as proposed in previous articles. Mn amount contained in the base material gives a more effective role to the penetrator defect rate than to the Mn/Si ratio.

유의어와 반의어 간 의미자질 차이에서 비롯하는 범주특성의 신경표상: ERP 연구

김충명 한국어의미학회 2008 한국어 의미학 Vol.25 No.-

The present study aims at clarifying the relationship between synonym and antonym with respect to their semantic similarity other than their differentiation. It's believed that the two items consisting of antonymy occupy different positions where one excludes the other from the same semantic field. Here we examined the inter-relationship between the two categories in a two-choice reaction time (RT) based on the lexical decision task and ERPs(Event-related Potentials) signatures. As expected, RTs were shorter for the condition of antonym than that of synonym relation possibly due to the prominence over the synonymous words. However no difference is found between antonym and unrelated word class. For the ERPs' component, P300s (positive peak at about 300ms after the stimulus onset) and N400s (negative peak around 400ms) morphology of the ERP reflecting the perceptual familiarity among the stimuli and semantic distance respectively, were found in all conditions. Though synonym and antonym were not differentiated in the P300, they both produced larger P300 response than other words in the unrelated condition. By contrast, the N400 of them recruited the difference in its amplitude mainly over the frontal areas. These results suggest that the structure of synonym and antonym should be constructed via identical semantic space indexed as the P300 as well as the N400 critical difference based on the specific semantic feature.

우울 및 불안 장애에서의 인지적 처리와 정서조절 고찰 : 신경인지 연결망을 중심으로

김충명 대한산업경영학회 2021 산업융합연구 Vol.19 No.6

본고는 인지적 과제를 수행하는 동안 우울 및 불안 환자의 정신병리적 과정과 이의 치료접근 방식에 대한 통합적 이해를 위해 최근 제시된 신경인지 연결망을 토대로 인지과정 및 정서조절의 비정상적 기능 연결성을 재해 석 할 수 있는 모델을 제안하고자 하였다. 재구성된 우울과 불안장애 신경인지 연결망 모델을 통해, 우울증은 불이 행방식 연결망(default mode network; DMN)의 과다 활성화에 기인하는 ‘자기참조적 사고로의 과몰입’으로, 불안 장애는 불이행방식 연결망의 과소 활성화에 기인하는 ‘자기참조적 사고와의 단절’로 규정해 볼 수 있음을 확인하였 다. 신경인지 연결망 중 자기의식 및 투사와 관련되는 자기참조 처리가 주요 기능인 DMN의 비정상적 활성화와 병리적 기능의 체계적 연결시도는 우울와 불안에 대한 통합적 해석과 치료적 접근에 시사점을 줄 수 있는 또 다른 출발점이 될 수 있을 것이다. This review aims to propose a model that can reinterpret the abnormal and functional connections between cognitive processes and emotional regulations based on the neurocognitive networks for a comprehensive understanding of pathologic processes and treatment approach of depression and anxiety disorder. Through the processes of rebuilding the network model for depression and anxiety disorder, it was confirmed that depression can be said to be ‘over-immersion in self-referencing’ due to hyper-activation of default mode network (DMN), and anxiety disorders to be ‘disconnection with self-referencing’ due to hypo-activation of DMN. The attempts to link up between abnormal activation and pathological function of DMN which is thought to be involved in self-referential processing associated with self-consciousness and projection among neurocognitive networks may be another starting point that can afford to be suggestive in integrated interpretation and therapeutic approach to depression and anxiety disorder.

라인 파이프 용접기술의 현황 및 전망

김충명 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.5

ERW Simulator를 이용한 고주파 전기저항 용접부의 품질 특성

김충명,김용석 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.3

한국어 모국어화자에서의 중의적 영어복문의 이해과정: ERP 연구

김충명,남기춘 한국인지및생물심리학회 2007 한국심리학회지 인지 및 생물 Vol.19 No.4

This study was conducted to find how to process an ambiguous sentence related with garden-path sentence(GPS) and early closure sentence(ECS), and to reveal the difference of contribution between their syntactic and semantic informations using ERPs. Task to be required is to read silently and respond to the presented English phrase by self-paced reading method. Analyses on behavioral response time show the significant delayed response to the controlled GPS and ECS condition. The current ERP results showed that embedded GPS sentences elicited more enhanced P600 but a slight difference of N400 while ECS sentences were more sensitive to N400 than small difference of P600. These results signify that on-line processing of ambiguity-related embedded sentence can be diverged based on the burden of interpretation of the given ambiguous word. Differential ERPs components in each type of experimental sentences suggest that the difficulty of sentential reanalysis as reflected on P600, and the need of the shift on thematic role indexed as N400 respectively were differently involved in processing English ambiguous-embedded sentences. 본 연구는 중의적 해석이 가능한 특정 영어구문에 대해 한국어 모국어화자들의 해석과정을 해당어구의 읽기시간과 신경생리학적 지표로서의 사건관련전위(Event-related Potentials; ERPs)를 이용하여 확인하고자 하였다. 외국어로서의 영어를 처리하는 과정에서의 구문적 중의성이 내포된 미로문장(garden path sentence; GPS)과 이른종결문장(early closure sentence; ECS)을 대상으로 자기 조절 읽기 과제(self-paced reading)를 사용하여, 중의어구가 포함된 실험문장과 중의성이 개재되지 않은 통제문장에서의 반응을 얻었다. 실험결과, 미로문장 통제조건 및 이른종결문장 조건의 중의성 관련어에서 유의미하게 읽기 반응시간이 지연되어 나타났다. 또한 동일 유형의 중의구문에 대한 ERP 실험에서도 차별적 신경활성화 지표를 확인할 수 있었는데, 미로문장 조건에서는 구문재분석 부담이 증가되는 방향의 지표인 P600이 두드러진 데 비해, 이른종결문장 유형은 해당어구의 의미역할 변화를 초래하는 방향으로 해석가능한 N400에서 그 차이가 나타났다. 이와 같은 결과는 각기 다른 해석방법을 지니는 복문의 상이한 유형이 그 구조의 차이 외에 의미적 해석이 우선적으로 적용될 수 있으며, 중의구조 유형 간 해소과정이 각기 다른 처리단원으로 분리되어 있음을 시사한다.

유발된 정서가 대학생의 부정적 어휘정보 처리에 미치는 효과

김충명 중소기업융합학회 2020 융합정보논문지 Vol.10 No.10

본 연구는 정상 및 불안 집단 대학생을 대상으로 하나 또는 그 이상의 부정적 어휘를 포함하는 서술어의 의미추론 과정에서 정서유형 및 부정어휘 출현의 정도가 과제처리 속도에 미치는 영향을 알아보고자 수행되었다. 정서 3유형, 자극 2유형 그리고 부정어휘 횟수 3유형을 피험자 내 변인으로, 벡(Beck) 불안척도로 구분된 불안수준을 피험자 간 변인으로 혼합반복측정 설계를 적용하여 피험자 반응시간에 대해 분석한 결과, 정서유형과 자극의 종류 그리고 부정어휘 횟수에 대한 주효과를 확인하였으며, 불안수준 x 부정어 횟수에서 상호작용이 발견되었다. 긍정적 정서에 비해 부정적 정서에서, 비언어 자극보다는 언어 자극 환경에서 과제처리에 더 효율적이었지만, 부정어휘 변인에서는 그 횟수의 증가가 정상집단 의 신속한 반응과 불안집단의 지연된 반응으로 분기되면서 부정어휘처리 반응시간의 지체로 나타났다. 또한 유입 정서유 형 및 자극의 종류와 상관없이 불안수준은 과제처리 속도를 지연시키는 요인으로 확인되었다. 아울러 추후 연구를 위한 함의와 한계를 논의하였다. The present study was conducted to investigate the influences of emotion priming and the number of negation words on the task of sentential predicate reasoning in groups with or without anxiety symptoms. 3 types of primed emotions and 2 types of stimulus and 3 conditions of negation words were used as a within-subject variable. The subjects were instructed to make facial expressions that match the directions, and were asked to choose the correct answer from the given examples. Mixed repeated measured ANOVA analyses on reaction time first showed main effects for the variables of emotion, stimulus, number of negation words and anxiety level, and the interaction effects for the negation words x anxiety combination. These results are presumably suggested to reflect that externally intervening emotion works on language comprehension in a way that anxiety could delay task processing speed regardless of the emotion and stimulus type, meanwhile the number of negation words can slower language processing only in a anxiety group. Implications and limitations were discussed for the future work.

언어장애의 몇 가지 유형에서 관찰되는 어휘빈도와 음운변화 효과

김충명,남기춘 한국언어학회 2008 언어 Vol.33 No.3

The present study aims at investigating the effect of Korean word frequency and phonological change in language disorder. Several types of aphasics showing Broca's aphasia, anomia, and verbal apraxia participated in this experiment. In experiment 1, we used the naming task related to word reading. Differently from the presence of the frequency effect in normal controls, the effect in word reading task showed different pattern across the aphasics. Moreover the phonological effect appeared to be inconsistent over the patients. Experiment 2 using lexical decision task also examined the effects just mentioned in Experiment 1 together with the effects according to types of nonwords. The first result in using word stimuli showed the dissociation between the effects of frequency and phonological change in aphasics in contrast to the normal subjects showing the phonological effect only in case of low frequency word. The second result of lexical decision time applied in pure-nonword and homonymous-nonword according to the presence or absence of phonological change showed different patterns across the aphasic patients. These results suggest that the strategies for the lexical decision in aphasics revealed the biasedness of lexical-addressed route irrespective of frequency and phonological change factors, whereas phonological-assembled route can be used for the nonwords as did in normal controls.