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이승용 한국교통대학교 2016 한국교통대학교 논문집 Vol.51 No.-
This study was performed to estimate the fatigue performance for the steel tubular truss specimen under constant amplitude cyclic load by fatigue test. From the test, hotspot stress and stress concentration factor of the lower chord to diagonal member joints were analyzed. And the fatigue life of actual steel tubular truss bridge was estimated. From the results, it was able to properly analyze the hotspot stress and stress concentration factor measuring the strain in the weld toe of the steel tubular truss joints. And using the hotspot stress and stress concentration factor analyzed from test results, it was able to properly estimate the fatigue life of actual steel tubular truss bridge.
소수성 가소제 Diethylphthalate가 Ethylcellulose 필름으로부터의 살리씰산 방출에 미치는 영향
이승용,신상철,이민화,심창구 대한약학회 1984 약학회지 Vol.28 No.3
Release characteristics of salicylic acid from ethylcellulose(EC) films containing varying ratio of dieththylphthalate (DEP) were studied. Mathematical analysis of the release data showed that the release behavior actually conforms with the Higuchi's diffusion-controlled model. The release rate constants(k) were independent from the film thickness and the pH of release medium, but were proportional to the concentration of salicylic acid itself. The logarithm of the release rate constant (log k) increased as the concentration of DEP was increased. In conclusion, hydrophobic plastisizer DEP seemed to be very useful in controlling release rate constant of slightly soluble drugs as like salicylic acid without changing it's release characteristics.
李丞鏞 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-
To evaluate quantitively to the characteristics of the stress distribution to the various damage in truss railway bridges, the damage cases is examined to the fatigue and deterioration at home as well as abroad. And by assuming damage level, it is studied to the relations between the damage level and stresses in each member from the time history analysis. As the results, the damage in members has an effect on the stress histogram and the stress magnitude. Also, the relative magnitude of stress in members is changed, due to the truss type and the characterristics of railroad traffics.
포르투칼어 동사의 시상에 관한 연구 : SER와 ESTAR의 시상을 중심으로
이승용 한국외국어대학교 언어연구소 2001 언어와 언어학 Vol.26 No.-
Coreanos te^m.em geral, grande dificuldade de transcrever asnoc˛o~es tempos e aspectuais em li´nguas ocidentais pela causa do sistema temporal completamente diferente delas. O coreano e´ uma li´ngua que na~o tem fronteira clara que possa distinguir Tempo e Aspecto. Esta particularidade deste idioma conduz coreanos a usar ingle^s como um ponto de partida quando apreender outras li´nguas ocidentais porque no´s, coreanos, estudamos ingle^s desde crianc˛a, temos bons conhecimentos, especialmente, sobre a grama´tica. Aplicac˛o^es indiscrimina´veis do sistema ingle^s sem perceber as difere^ncias causam erros graves. Estudantes de portugue^s fazem mesmos erros dixando passar as difere^ncias dos sistemas temporais e aspectuais entre ingle^s e portugue^s. O portugue^s e´ conhecido como uma li´gua que tem o sistema temporal mais desenvolvido e forte do que aspectual. E na~o menciona nada do aspecto ao ni´vel da grama´tica normative. Entretanto os valores aspectuais te^m importantes pape´is para gerar frases na~o so´ grama´tica mas tambe´m aceitave´is. Entre outros, SER e ESTAR, verbos copulativos em portugue^s, mostram, explicitamente, o carater diferente dos valores aspectuais. Em geral, eles te^m distribuc˛o~es complementarias mostrando que possedem diferentes valores aspectuais. Parece esta difere^ncia e´ muito neta e clara. Mas tambe´m encontram-se outros casos que manifestam a incompatibilidade da explicac˛o~es dadas no quadro da grama´tica normative. Ao luz desta incompatibilidade da explicac˛ao grama´tica baseada so´ nas noc˛o~es temporais, precisa de introduir uma outra noc˛a~o alternativa, seja o aspecto. Ha´ na verdade, numerosos pesquisadores que tinham referido ao aspecto. Seus estudos, pore´m, na~o tentavam a explicar as fenomenas causadas pela difere^ncia dos valores temporais as quais afectuam grama´ticalidade e aceitabilidade das frases. Neste estudo, enta~o, vou fazer uma pesquisa para establecer um esquema que puder mostrar as difere´ncias dos tempos e aspectos de portuge^s de maneira explicita independente de ingle^s afim de oferecer aos estudantes um crite´rio credi´vel para compreender melhor o sistema temporal de portugue^s para minimizar os erros. Ale´ disso, parece que a compreenc˛a~o mais profunda do sistema do tempo e aspecto em portugue´s nos fazera´ explicar algumas distribuc˛o~es complemeta´rias dos artgos de´finidos e inde´finidos especialmente com os verbos copulativos.
원형 전단링을 사용한 강부재 이음부의 역학적 거동에 관한 해석적 연구
李丞鏞 충주대 2004 産業科學論文集 Vol.12 No.-
Because the friction type high tension bolted joints which is typical construction method of steel structures need strict control of axial force, many times and labor are required to adopted it to the steel structures connection. Also, because high shear strength of high tension bolts can not be used sufficiently due to the design of the high tension bolt is carried out considering slip load, more bolts are used in connecting members. The analytical study on the design parameter is carried out to analyze the mechanical behavior of bearing type high tension bolted joints which using shear-ring by LUSAS. From this study, establish the limit state with considering thickness change of the base metal and splice plate. With the investigation on the edge distance and pitch, suggesting minimum edge distance and minimum pitch. It is concluded that apply the design safety factor which require to guarantee the ductility capacity of the friction type high tension bolted joints method to the bearing type high tension bolted joints which using shear-ring is possible.
포르투갈어 포어와 브라질 포어의 정관사 차이 연구: 문법화를 중심으로
이승용 한국외국어대학교 언어연구소 2020 언어와 언어학 Vol.0 No.90
This study compared presence of the definite article before the pre-nominal possessive in European Portuguese with its absence in Brazilian Portuguese. The distributional difference of the definite article between these two dialects is not due to the specification of the definite article but to the level of grammaticalization of the definite article. It is argued here that the assumption of the expletive definite article is not an option in this language to explain its presence before the possessive. Rather, the differentiation of adjective possessive and determiner possessive is more useful in the light of the evolution of the definite article from Latin demonstratives. 포르투갈어 정관사는 영어나 인접어인 스페인어와 달리 소유사와 동시에 명사 앞에 나타날 수 있다. 정관사가 소유사와 함께 쓰이지 않는 언어에서는 한정사가 DP 한 곳에 나타나기 때문에 복수의 한정사가 동시에 동일한 자리에 투사될 수 없기 때문이다. 반면에 포르투갈어처럼 정관사와 소유사가 함께 나타날 수 있는 언어에 대해서 Castro(2007)은 정관사가 아무런 의미자질이 없이 명사구를 완성시키기 위해 사용하는 허사(expletive)로 분류하고 EP와 BP의 차이는 EP는 허사로서의 정관사를 갖고 있는 반면에 BP는 정관사가 허사로서의 기능이 없기 때문이라고 설명하고 있다. 그러나 본 연구애서는 EP에서도 정관사가 생략될 수 있으며 정관사가 사용되는 경우와 생략되는 경우에 의미적인 차이가 있기 때문에 EP에서도 정관사를 허사로 보기 어려움을 지적하고 소유사와 함께 사용되는 정관사가 EP와 BP 사이에서 보이는 차이 그리고 EP 내에서 정관사의 분포의 차이를 통사적으로 설명하기 보다는 정관사의 문법화 정도로 설명하고자 한다.