전단보강근량에 따른 초고강도 콘크리트를 사용한 고층형 내력벽의 이력거동

윤현도,연길환,정수영,윤석천,이창갑 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.1

Three one fourth scale models using ultra high-strength concrete(f' =704 kg/㎠) are tested under the combined action of a constant axial and a horizontal load cyclically to failure. Such specimens are considered to represent the critical 3-story of low part in 60-story tall building of a structural wall system in area of high seismicity. The amount of vertical reinforcement and the level of applied axial stress are identical for the three wall tested. The cross-section of all walls is barbell shape. The aspect ratio(h /l ) of test specimen is 1.8. The primary objectives of this paper are to investigate the influence of the amount of horizontal reinforcement on the lateral resistance, failure mechanism, ductility and energy-dissipation capability of walls with ultra high-strength concrete. In contrast to what is widely believed, the horizontal web reinforcement does not appear to have a significant effect on shear capacity. Certainly, since the reduction of the web horizontal reinforcement to almost half the value specified by building codes doesn't affect the failure load, this effect in not accounted for by the truss analogy concept. The results obtained have helped to identify the causes of wall failure and have demonstrated that the concepts underlying current ACI Building Code provisions for the design of walls conflict with the observed structural behavior. It has been found that shear resistance is associated with triaxial compressive stress conditions that develop in the compressive zone of the section at the base of the wall.

일정축력 및 반복 횡하중을 받는 철골철근콘크리트 기둥의 내력과 변형성능

정수영,연길환,임경택,윤석천,한병찬 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

An experimental investigation was conducted to investigate the strength and deformation capacity of Wide Flange Steel Encased Reinforced Concrete(SRC) Columns subjected to constant axial compression and cyclic lateral loading conditions. Six one-third scale specimens were tested, each consisting of a structural steel size encased in reinforced concrete. The parameters studied in the test program included the effects of B/t ratios of encased steel(=13, 18, 23), ratios of axial force(=1/3, 1/6). As a result, capacity prediction based on superimposing the moment-axial-load interaction surfaces of the steel shape and reinforced concrete produced good results; the average of the experimental-to-predicted capacity ratio being equal to 0.99∼1.20. The observed hysteretic behavior of the test specimens indicated that adequated ductility can be achieved and the concrete core must be inhibited to buckling of wide flange.

뚜렷한 입체 선택성을 갖는 알릴 디올의 고리 카보네이트와 아세토니드의 Wacker 산화 반응 연구

강석구,정경윤,정재욱,남궁은영,김태현 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1

Palldium(Ⅱ) 촉매 하에서의 말단 알릴 디올의 고리 카보네이트와 아세토니드의 산화반응은 anti-Markovnikov hydation에 의해 알데히드 또는 α,β-불포화 알데히드 만이 생성되었다. 치환된 알릴 디올의 분자내 이중 결합의 반응으로는 (E)-알릴 디올의 경우에 β-케토 생성물을, 반면에 (Z)-알릴디올의 경우엔 α-케토 생성물을 얻을 수 있었다. 치환된 알릴 디올의 고리 카보네이트와 아세토니드에서는 각각 β-케토 화합물과 α,β-케토 화합물 들이 생성되었다. Palladium(Ⅱ)-Catalyzed oxidation of acetonides or cyclic carbonates of terminal allylic diols afforded aldehydes or α,β-unsaturated aldehydes as the sole products, resulting of anti-Markovnikov hydation. For the internal olefins of the substituted allylic diols, (E)-allylic diol provied β-keto-product, whereas (Z)-allylic diol affored α-keto-product. The acetonides and cyclic carbonates of the substituted allylic diols yielded β-keto-products and α,β-unsaturated ketones, respectively.

백삼에 있어 수침처리가 체형 및 사포닌 함량에 미치는 영향

한윤경,이이,이문순,권숙희,정찬문 충북대학교 연초연구소 2009 煙草硏究 Vol.22 No.-

본 연구는 수침 처리가 백삼제품의 원형복원에 미치는 영향을 조사하여 백삼제품 제조에 사용한 원료수삼의 품질을 평가하기 위한 기초자료를 얻고자 수행하였던 바 결과를 요약하면 다음과 같다. 백삼의 수침처리는 원료수삼과 같은 수준으로 원형을 복원할 수 있어 제품에 사용된 원료수삼의 뇌두의 경흔적, 동체부위의 피해정도 그리고 내부조직의 나이테 관찰이 용이하여 연근판별 및 품질평가가 가능하였다. 백삼제품의 ginsenoside 함량은 제조회사에 따라 다소 차이가 있었으며 panaxadiol계 사포닌은 ginsenoside-Rb₁이 많고, panaxatriol계 사포닌은 ginsenoside-Rg₁이 높게 나타났다. 그리고 수침에 의한 백삼의ginsenoside 함량은 수침온도가 증가할수록 감소하는 경향이었다. This study was conducted to investigate the effects of soaking treatment in white ginseng and evaluated quality evaluation of raw ginseng and ginsenoside. Restoration to the original state of the raw ginseng can be achieved by soaking treatment in white ginseng. Stem vestige at rhizome and damage of main root of the swelled white ginseng was examined by eyes and annual rings by microscope easily. Soaking treatment made it easy to be examined the identification of root age and quality evaluation of white ginseng. The content of ginsenoside showed difference among the three products. The content of ginsenoside-Rb1 was highest among the constituents of protopanaxadiol saponin and the content of ginsenoside-Rg1 among that of protopanaxatriol saponin. The higher the soaking temperature was, the lower the content of ginsenoside in the white ginseng was.

백삼에 있어 수침처리가 원형복원에 미치는 영향

한윤경,이이,이문순,권숙희,정찬문 충북대학교 연초연구소 2009 煙草硏究 Vol.22 No.-

본 연구는 시중에서 거래되고 있는 백삼을 구입하여 수침 처리가 백삼의 원형복원 및 사포닌 성분에 미치는 영향을 구명하고자 수행하였다. 시판백삼은 같은 등급 및 편급의 제품이었으나 뇌두, 근장, 근직경 등 조사 형질에서 제품간 차이가 있었다. 그리고 수침처리에 의해 근중, 동체, 근직경, 근장 등은 증가하여 원료삼으로서 수삼상태를 확인할 수 있었다. 또한 이들 백삼은 온도가 증가할수록 체적이 빨리 증가하여 온도에 의한 영향을 크게 받았으며 다시 건조하여 본래 백삼의 상태로 환원하는 것이 가능하였다. 그리고 수침에 의한 근중의 변화는 2배 이상 증가하였는데 근중이 최고도에 달하는 시간은 대략 24시간 후 이었다. This study was conducted to investigate the effects of soaking treatment in white ginseng and evaluated white ginseng on the restoration to the original shape and the quality of raw ginseng. KW-1 white ginseng had longer rhizome length and main root length. KW-2 had larger rhizome diameter, main root diameter and root weight. KW-3 showed lower quality than the other two white ginseng products. Soaking treatment made the root weight, main root diameter and main root length of raw ginseng increased. The decrease of root weight was significant by drying. The effects of soaking and drying treatment on the characters investigated of the raw ginseng and white ginseng showed same tendency. The higher the soaking temperature was, the faster the increasing rate was. The increasing of white ginseng stopped after around 12 hours from soaking at any soaking temperature.

화학양론 조성 Mullite 의 합성과 그 소결특성

안석헌,정윤중,염희남,이종민 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-

Stoichiometric mullite powder was prepared with Al(OH)₃, which was synthesized from Al₂(SO₄)₃·18H₂O and SiO₂, which was hydrolysised from TEOS(Al₂O₃:SiO₂=3 : 2 mole%), the sintered body of only mullite and the Y₂O₃ added mullite body were prepared and it's properties were detected. The results are follows. Crystalized mullite begins to founded from 1200 calaination and Well-Crystalzed mullite forms from the calcination temperature, 1300℃ . Crystal grains of mullite is accicular, and its relative density and bending strength of mullite ceramics which is sintered at 1650℃ are 92% and 180Mpa, respectively. As Y₂O₃ addtion the bending strength can be increased to 220MPa, because Y₂O₃ distribute and fill the vacancies of accicular mullite grain boundaries.

2-프로핀일 고리 카보네이트의 Pd(0) 촉매를 이용한 가수소분해반응연구 : (Z)-호모알릴알콜과 2-호모프로핀일 알코올의 합성 Catalyzed Hydrogenolysis of Prop-2-ynylic Cyclic Carbonates

강석구,박동철,정재욱,정경윤 성균관대학교 기초과학연구소 1994 論文集 Vol.45 No.1

삼중 결합을 갖고 있는 2-프로핀일 고리카보네이틀 Pd(acac)_2와 nBu_3P을 촉매로 하여 포름산 암모늄염을 사용한 탈카르복실화-가수소분해반응을 이용해서 (Z)-호모알릴 알콜과 2-호모프로핀일 알콜을 반응조건에 따라 각각 합성하였다. 그리고 분자끝 2-프로핀일 고리카보네이트의 가수소분해반응을 이용하여 호모알릴 알콜을 합성하였다. (2S. 4Z)-1-(p-메톡시벤질옥시)-2-히드록시-4-헵틴 2b를 광학활성 중간체로 사용하여 pyralid 나방 Aphomia gularis의 male 성페르몬을 합성하였다. The decarboxylation-hydrogenolysis of prof-2-ynylic cyclic carbonates which have an internal acetylenic bond with ammonium formate in the presence of a catalytic amount of [Pd (acac)_2] and nBu_3P afforded(Z)-homoallylic alcohols or homoprop-2-ynylic alcohols dependin on the reaction conditions. however, hydrogenolysis of terminal prop-2-ynylic cyclic carbonates gave homoallylic aicohols; using (2S, 4Z)-1-(p-Methoxybenzyloxy)-2-hydroxy-4-heptyne 2b as a chiral synthon, the male sex pheronome of the pyralid moth Aphomia gularis has been synthesized.

진딧물의 경보페로몬인 (E)-β-Farnesene의 합성과 생물활성시험

강석구,정경운,이정운,고현관 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.1

(E)-β-Farnesene, the alarm pheromone of aphids was synthesized from nerolidol by reacting in a sealed tube at 150℃ for 24h with DMSO. Base(KOtBu/DMSO) catalized elimination of HCl from farnesyl chloride at 50℃ for 4h afforded (E)-β-farnesene as the major product. Farnesyl chloride was prepared from nerolidol or farnesol with SOCl_2 or HCl. Biological activity test of (E)-β-farnesene thus synthesized was conducted.

분절 광배근 유리피판의 유용성

이훈범,김석원,정윤규,박윤규 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.5

Since the first report by Tansini in 1896, the latissimus dorsi muscle free flap has been widely used for various types of soft tissue defect due to reliable anatomy with a sufficient diameter of neurovascular pedicle and a sizable muscle. However, for relatively small soft tissue defect, latissimus dorsi free flap offers several distinct disadvantages of donor site including loss of the posterior axillary fold and flattening of the posterolateral chest wall, weakness of upper arm strength in extension, adduction and internal rotation. We treated three patients having various types of soft tissue defect using segmental latissimus dorsi muscular free flap depending on its descending branch of thoracodorsal neurovascular pedicles. There were no serious complications during 18 months of mean follow-up. We concluded that this method has some advantages such as no weakness of strength of the upper arm including walking on crutches, preserving the posterior axillary fold, preventing winging of the scapula and increased chance of using a flow-through technique. Here we present our cases of reconstruction of soft tissue defect using segmental latissimus dorsi free flap with a review of the literature.

SAPO-11, Pd/SAPO-11 分子體 觸媒上에서 MTO( Methnol to Olefin ) 反應活性에 關한 硏究

金昌大,林相潤,丁碩鎭 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-

In order to suggest an efficient catalyst system for methnol-to-olefin(MTO), various catalysts, SAPO-11, ion exchanged Pd/SAPO-11, HZSM-5, SAPO-34 and Mordenite, were prepared, and then characterized with various characterization techniques and evaluated for its ability of MTO. By chemisorbed NH_(3) TPD, we consider that the acid amount and strength could be controlled by the optimum number of ion exchange trials. From the activity test. It was found that the main product was C3 olefin onall of the tested catalysts. In the comparison of the C3 olefin selectivity, SAPO-11 showed the highest selectivity (>80%) in broad temperature region. In case of ion exchanged Pd/SAPO-11 catalyst system, the C3 olefin selectivity was promoted with the number of ion-exchange level until 2, which means that the optimum ion exchange level for the highest yield of C3 olefin from methanol is 2. In case of water addition effect, the C3 olefin selectivity on SAPO-34 was improved dramatically more than 90%, but there was no appearence of selectivity change on SAPO-11 before and after water addition.