리브로 보강된 철골 모멘트 접합부의 내진거동에 관한 실험적 연구

이철호,정종현,이재광,오명호,구은숙 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.4

simple design method for seismic steel moment connections has been recently proposed basedon the equivalent strut model. An experimental program was implemented to verify the proposed design method, as wel as develop the schemes that wil prevent cracking at the rib tip where stress concentration was evident. All specimens designed using the proposed method were able to develop a satisfactory connection plastic rotation of 0.04 radian. In addition to rib reinforcement, slight beam flange trimming pushed the plastic hinging and local buckling of the beam away from the rip tip and effectively reduced cracking potential at the rib tip. Using strain gage readings, the strut action of the rib and resulting reverse shear in the beam web were also experimentally identified. 리브로 보강된 철골 모멘트 내진접합부에 대한 실용적이고 간단한 설계법이 등가스트럿 모델을 바탕으로 최근에 제안된 바가 있다. 본 논문에서는 제안된 설계법을 검증하고 응력집중에 의한 리브 단부의 균열방지 방안을 모색하기 위한 실험결과를 기술 하였다. 제안된 설계법에 의해 설계된 모든 실물대 시험체는 접합부의 소성회전각이 0.04 (radian)에 이르는 뛰어난 내진성능을 발휘하였다 . 접합부를 리브로 보강함과 동시에 보의 플랜지 일부를 잘라내어 보의 소성힌지와 국부좌굴의 발생위치를 리브의 끝단으로부터 보 안쪽으로 약간 이동시킴으로서, 리브단부의 균열발생을 효과적으로 제어할 수 있음을 실험적으로 확인하였다 . 또한 리브의 스트럿 작용과 이로 인한 보 웨브에서의 전단역전을 스트레인 게이지 계측을 통하여 실험적으로 입증하였다 .

RBS 철골모멘트접합부의 내진거동평가를 위한 반복재하 실물대(實物大) 실험

이철호,김진호,전상우 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.4

paper summarized the results of a full-scale cyclic seismic testing on four reduced beam section (RBS)steel moment connections. Specifically, these tests addressed a bolted web versus a welded web connection and strong versus medium panel zone (PZ) strength as key test variables. with medium PZ strength were designed to promote balanced energy dissipation from both PZ and RBS regions, in order to reduce the requirement for expensive doubler plates. Both strong and medium PZ specimens with welded web connection were able to provide suficient connection rotation capacity required of special moment-resisting frames. On the other hand, specimens with bolted web connection performed poorly due to premature britle fracture of the beam flange at the weld access hole. Unlike the case of web-welded specimens, specimens with cheaper bolted web connection not transfer the actual plastic moment of the original (or unreduced) beam section to the column. No fracture occurred within the beam groove welds of any connection in this testing program. If fracture within the beam flange groove weld is avoided by using quality welding procedure as in this study, the fracture issue tends to move into the beam flange base metal at the weld access hole. Supporting analytical study was also conducted in order to understand the observed base metal fracture from the engineering mechanics perspective. 본 논문은 4개의 RBS 철골모멘트 접합부에 대한 반복재하 실물대 (實物大) 실험결과를 요약한 것이다. 주요 실험변수는 기둥과보의 접합방식 (볼트접합 대 용접) 및 패널존의 강도 (강한 패널존 대 중간강도 패널존 )이다. 중간 패널존 강도를 갖는 시험체는 패널존과 RBS 영역 모두에서 균형잡힌 방식으로 에너지가 소산되도록 고려하여 설계된 것으로 패널존 보강비용을 줄이고자 시도한 경우 이다. 보웨브가 용접으로 접합된 경우의 시험체들은 특별연성모멘트골조에 요구되는 충분한 접합부 회전성능을 보여 주었지만 , 웨브를 볼트로 접합한 시험체들은 스캘럽을 가로지르는 보플랜지의 조기 취성파괴로 인해 열등한 내진성능을 노출하였다 . 보웨브를 볼트로 접합하면 비용을 줄일 수 있으나 원래 보단면의 전소성모멘트를 기둥에 전달하기에 어려운 것으로 나타났다 . 본 연구에서 적용된 것과 같이 양질의 용접시공에 의해 일단 그루브 용접부 자체의 취성파괴 문제가 해결되고 나면 , 용접접근공내에 위치한 보플랜지 모재의 파단이 다음의 문제로 대두됨을 알 수 있다 . 용접접근공 내의 보 플랜지 파단문제를 역학적인 측면에서 이해하는데 도움이 되는 해석적 연구도 수행되었다 .

Phenobarbital이 신생아 고빌리루빈혈증에 미치는 영향

이철호,이의재,조보경,전정식,조성훈 최신의학사 1990 最新醫學 Vol.33 No.1

보건관리위탁업무에서의 직업환경의학 전문의의 역할

이철호 대한직업환경의학회 2016 대한직업환경의학회 학술대회 논문집 Vol.2016 No.11

Samson Agonistes : 구원의 주제와 비극시의 가능성 The Possibility of a Tragedy with a Christian Theme

李鐵昊 한국밀턴학회 1991 중세근세영문학 Vol.1 No.-

To appreciate Samson Agonistes properly, two facts must be taken into consideration. First, Milton's chief concern throughout his life was with poetry as a means of facing the way of the world and coming to terms with it. The other fact is that like all the Greek tragedies the focus of the poem is concentrated only on the protagonist, who is blind. After Samson becomes a slaving and blind prisoner, he makes his first appearance on the stage. He cannot see, nor can he make physical movement freely. So the action of the poem must take place in the hero's inner world, and be expressed mainly through the dialogues between him and his visitors. Moreover, the audience who has already known the story of Samson is interested not in what he does but in how he does it. Hence, the 2nd section discusses how Milton makes free but proper use of the essential elements of Greek tragedy such as chorus, hubris, and catharsis in a poem focused on the blind hero's inner development toward regeneration. In section 3, the law of the plot and the way of unfolding and supporting the plot by recurrent images, motifs, and the 'talent' metaphor are studied. It cannot be said that the visitors come according to Aristotle's law of inevitable or probable sequence. Though his law is not applicable here, there is a law which is one of increasing tension. That is, the visitors appear in order to develop and intensify the inner drama of Samson. The 4th section discusses the tragic qualities of Samson Agonistes. To be really effective, a tragedy with a religious theme should present in a persuasive way the interaction between a suffering man and the supernatural power. In a Christian tragedy there must be the doubt and the pain, or the pity of the human sufferer as well as the affirmation and awe of God's Providence. In short, the hero's religious resolution and victorious death do not lessen our concern for Samson the man. The interaction between Samson's free will and God's Providence makes the poem a tragedy, not a mere religious poem. Samson suffers and learns as a man before he can fulfill God's will. Indeed, God's presence seems to preside over the whole play, but we can also find human stubbornness, pride, ignorance, weakness, and, in spite of all, human dignity. This article tries to show that Samson Agonistes is a tragedy which focuses not on the conflict between God and Dagon, or Samson and the Philistines but on the suffering and regeneration of the fallen Samson when he makes desperate efforts to overcome his predicament and to vindicate God's way to man. Samson Agonistes is a tragedy which deals with the meaning of human suffering in the context of Christian salvation.

『무정』과 낭만적 자아

이철호 동국대학교 한국문학연구소 2000 한국문학연구 Vol.0 No.23

환상췌장 수술 후 합병된 신생아 패혈증 증례보고

이철호,김완섭,정을삼 예수병원 1997 예수병원학술지 Vol.18 No.-

국내산 cGMP 기준 의약용 동결건조기에 의한 동결건조후 항생제의 안정성 평가

이철호 서경대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.18 No.-

After the vacuum freeze drying of antibiotics by cGMP-base vacuum freeze dryer, fluorescence microscopy has been carried out to obtain that there was no physical change of the antibiotics. Inhibitory circle test of the antibiotics against bacillus subtilis revealed that there is no difference in antibiotic activity between before and after vacuum freeze drying. The structural stability of antibiotics was also examined by high performance liquid chromatography. Typical distinctive peak of ampicillin was observed in both before and after vacuum freeze dried sample and any other one except ampicillin peak could not be found throughout high performance liquid chromatographic analysis. These results suggest that cGMP-base vacuum freeze dryer could be applied to the vacuum freeze drying of medicine such as antibiotics without the loss of antibiotic activity and structural stability.

cGMP 기준 의약용 동결건조기의 동결 건조 조건의 최적화

이철호 서경대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.18 No.-

The conditions for vacuum freeze drying of ampicillin and kanamycin were optimized. cGMP-base vacuum freeze dryer, developed and manufacture by Biocryos Co. Ltd, was used. In the drying of acqeous solution of antibiotics, vacuum freeze drying has been proved to be more effective than simple vacuum drying in the stability of the antibiotics. The effect of two controlling mode, simple controlling mode and intelligent one on the stability and solubility of antibiotics was investigated. There is no difference on the stability between two mode, but the former is more effective than the latter on the solubility. These results suggest that intelligent controlling mode is more desirable than simple one for vacuum freeze drying of medicine such as antibiotics by cGMP-base vacuum freeze dryer.

"L`Allegro" 와 "Il Penseroso" : 詩神과 쟝르 Muses and Genre

이철호 한국밀턴학회 1993 중세근세영문학 Vol.3 No.-

Milton's twin poems, "L'Allegro" and "Il Penseroso", have been much discussed in the light of a variety of taditions-the academic prolusion, the rural excursion, and the argumentative debate-, but their basic relation with classical genre has not been sufficiently noticed. Especially the identity of Mirth and Melancholy not only as classical goddesses but as two speakers' patron goddesses has been overlooked as interpretive guide to the meaning and connection of the companion poems. Milton shows each different kind of genre in epitome by selecting as patroness for "L'Allegro" the most active and social of the 3 Graces, Euphrosyne, and as patroness for "Il Penseroso" the most remote and contemplative of the 9 Muses, Urania. Mirth inspires 'less serious genre' like the lyric, elegiac, and bucolic pastorals, while Melancholy inspires 'more serious genre' such as the intellectual and contemplative idylls. As the speaker of "L'Allegro" makes the whole world of comedy and romance appear in a single figure, Hymen, so the poet of "Il Penseroso" makes the world of Tragedy and Epic in a personified Tragedy. In short, by means of a fusion of the world of classical mythology and the English landscape and social life Milton paints the portraits of the typical elegiac poet, who sings of love and wine, and the typical epic poet, who tackles higher themes and must lead a more ascetic life. The complex difference and similarity between the twin poems must be considered in this respect. Though Milton presents us two different accounts of poetical inspiration, there is no need to choose between the two and to favor the Muses above the Graces or vice versa.