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홍창우,김태경,김경진,김성환,김남윤,심도식,이정호,윤청호,백민경,원치문,박제선,이주형,정경일 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-
콘크리트 구조물이 대형화됨에 따라 설계단면이 증대되어 상대적으로 많은 경제적 손실을 부담하게 된다. 따라서 단면을 감소시키면서도 소요의 하중에 안전한 구조물을 건설하기 위해서는 우선적으로 구조물 건설에 기초가 되는 고품질, 고내구성의 고강도 콘크리트 개발이 절실히 요구된다 본 연구에서는 일정 시멘트비 및 혼화재 비율하에서 소요의 워커빌리티가 확보되는 고강도 콘크리트를 시간과 온도의 변화에 따라 증기 양생하여, 압축, 인장, 휨강도 뿐만 아니라 파괴특성을 실험적으로 연구하였다. 시료 제작시 시멘트 입자 사이의 공극 및 불연속 영역을 충전하여 고밀도화하기 위한 콘크리트용 혼화재로 시멘트 비표면적이 상당히 작은 초미립 분말인 실리카흄을 이용하였다. 또한 AE감수제 및 고성능 유동화제를 사용하여 혼화재의 첨가에 의하여 발생될 수 있는 워커빌리티의 감소를 방지하였다. 실험결과에 의하면 일정 양생 지속 시간하에서 온도의 증가에 따라 콘크리트의 압축, 인장 및 휨강도가 전반적으로 증가하였다. 동일하게 일정 온도하에서 양생 지속시간이 커짐에 따라 강도들이 증가됨을 알 수 있었다. 따라서 상대적으로 높은 온도와 긴 지속 양생 조건하에서 파괴에 대한 저항력이 크게 나타났다. The compressible, tensible, and flexibleresistance of the high strength concrete is analyzed by the experimentation in the present study. For the test, we cure several samples with the silica fume as a mixture being become dense the spaces between the particle of cement under the variation of both the temperature and the curing-interval. Then, the superplasticizer and the ezcon are also used to satisfy the required workability for construction. The compressible, tensible, and flexible resistances to a stress are increased as increasing the temperature and the time interval for the curing. Therefore it is concluded that the overal fractural and mechanical properties is improved by mixing the silica fume into the cement.
오리엔탈나리의 球根 收穫時期와 低溫處理 期間이 生育에 미치는 影響
金熙峻,金正萬,金致善,柳汀,崔泳根,文炳永 한국화훼연구회 2001 화훼연구 Vol.9 No.1
This study was carried out to determine the effect of the duration of chilling treatment and the lifting time of bulbs on growth of Lilium Oriental hybrids for product of cut flower in the type of forcing or semiforcing culture in Korea. "Casablanca", "Acapulco" and "Le Reve" in lilium Oriental hybrids were used in these experiment and carried out from 1999 to 2000 in Iksan, Korea. The bulbs for experiment were lifted on August 27, September 27 and October 27 and the all of them were chilled at 5±1℃ for 0,8,10,12 weeks. Development of the bulbs lifted on October 27 was superior than that of lifted bulbs on August 27 in the three cultivars. The bulbs lilted lately and chilled for a long time were sprouted more earlier and grown faster. In order to increase bulb sprouting until 100%, the duration of chilling treatment of bulbs was need for 12 weeks on August 27, 10 weeks on September 27 and above 8 weeks on October 27. The flowering according to the duration of chilling treatment and the lifting time of bulbs was same above. Consequently, the bulbs should be chilled at 5±1℃ for chilled for 10 weeks at late September and 8 weeks in producted bulbs at late October in earlyㆍMidseason variety fur product of cut flower hut bulbs of late variety should be chilled for 12 weeks at late September and 10 weeks at late October.
김지숙,양선기 順天大學校 1997 論文集 人文社會科學篇 Vol.16 No.-
ABSTRACTIn the semantic view, presupposition is defined in terms of the truth value condition. This does not directly involve the speakers, the hearers or the contexts in which the sentence is uttered. The pragmatic view involves the speakers, the hearers and the contexts. That is to say, an utterance of a sentence pragmatically presupposes that its context is appropriate. Under these concepts of presupposition, the purpose of this paper is to suggest that pragmatic presupposition is superior to semantic presupposi- tion in explaining the limits of semantic presupposition through cancellation, scope of negation and intuition, etc. In conclusion, this paper reveals that the notions of prag- matic presupposition should play an important role in the interpretation of meaning, and that much more data are possibly dealt with in terms of pragmatic presupposition than of semantic presupposition.
첨가질량이 존재하는 변단면 4변고정 적층복합판으 진동해석
박제선,김경진,원치문,심도식 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-
A method of calculating the natural frequency corresponding to the first mode of vibration of beams and tower structures, with irregular cross-sections and with arbitrary boundary conditions was developed and reported by D. H. Kim in 1974. This method has been developed for two-dimensional problems including the laminated composite plates and was proved to be very effective for the plates with arbitrary boundary conditions and irregular sections. In this paper, the result of application of this method to the clamped composite plates with non-uniform cross-section and with attached point mass/masses is presented.
Silicon-Nitrogen 결합을 갖는 새로운 Complex의 합성
한치선,이은주,김우선 연세대학교 자연과학연구소 1983 學術論文集 Vol.11 No.-
Trialkylsilane을 출발물질로 하여 Si←N 배위결합을 함유하는 5배위자 규소착화합물인 1-organosilatrane을 합성하였다. Si←N 배위결합의 형성은 얻어진 silatrane의 IR 및 NMR spectra에 의하여 확인하였다. 1-Organosilatrane의 합성에 사용한 용매는 methanol과 ethanol이었는데 얻어진 결과에서는 별다른 차이를 찾을 수 없었다. 얻어진 silatsane은 뜨거운 DMF로 재결정하였다. 1-Organosilatrane which has a pentacoordination bond was synthesized from trimethylsilane. The formation of Si←N coordination bond was indentified by IR and NMR spectra of the product. Solvents used for the synthesis were methanol and ethanol, and none of the solvent effect has been found. The product was recrystalized from hot DMF.
Kim, Kwang-Woon,Kim, Sun-Hee,Lee, Eun-Yup,Kim, Nam-Deuk,Kang, Ho-Sung,Kim, Han-Do,Chung, Byung-Seon,Kang, Chi-Dug 부산대학교 유전공학연구소 2001 분자생물학 연구보 Vol.17 No.-
Two signaling pathways, the extracellular signal-regulated kinase (ERK)/mitogen-activated protein kinase (MAPK)-dependent pathway and the nuclear factor-κB (NF-κB)-dependent pathway, have been known to mediate megakaryocytic differentiation of K562 cells induced by phorbol 12-myristate 13-acetate (PMA). In this study, we examined whether 90-kDa ribosomal S6 kinase (RSK), known as a substrate of ERK/MAPK and a signal-inducible IκBα kinase, would link two pathways during the differentiation. RSK_1 was ctivated in a time- and dose-dependent manner during the PMA-induced differentiation. Overexpression of wild-type or dominant inhibitory mutant (D205N) of RSK_1 enhanced or suppressed PMA-stimulated NF-κB activation and megakaryocytic differentiation as shown by expression of the CD41 megakaryocytic marker, respectively. In addition, overexpression of the dominant inhibitory mutant (S32A/S36A) of IκBα inhibited PMA-stimulated and RSK1-enhanced megakaryocytic differentiation downstream of RSK1. PMA-stimulated activation of ERK/MAPK, RSK1, and NF-κB and the PMA-induced megakaryocytic differentiation were prevented by pretreatment with PD98059, a specific inhibitor of the mitogen-activated ERK kinase (MEK). Therefore, these results demonstrate that the sequential ERK/RSK1/NF-κB pathway mediates PMA-stimulated megakaryocytic differentiation of k562 cells.