• Title/Summary/Keyword: 클로3D

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Synthesis of Unsymmetrical Trisannelated Benzenes (비대칭적으로 삼고리화된 벤젠의 합성)

  • Mahmoodi, Nosrat O.;Fatemeh, Mostaghni
    • Journal of the Korean Chemical Society
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    • v.46 no.1
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    • pp.52-56
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    • 2002
  • Synthesis of unsymmetrical trisannelated benzenes such as 2,3,4,5,6,7,8,9,10,11-decahydro-1H-cyclopenta[l]phenanthrene (1c) and 1,2,3,4,5,6,7,8,9,10-decahydrobenz[e]-as-indacene (1d) is described. The synthetic approach involves efficient condensation of pre-formed enones such as bicyclohexyliden-2-one (3), bicyclohexyl-1-en-2-one (4) and bicyclopentyliden-2-one (5) in the presence of cyclopentanone and cyclohexanone using anhydrous $CuCl_2$ as a catalyst.

Analysis of Chemical Constituents of Saccharides and Triterpenoids in the Korean Native Mistletoes - II. Screening the Extractives of Korean Camellia Mistletoe (Pseudixus japonicus) for Cytotoxicity - (한국산(韓國産) 겨우살이류(類)의 당류(糖類)와 triterpenoids의 화학적(化學的) 조성(組成) 분석(分析) - II. 동백나무겨우살이 추출물의 항암활성 성분 검색 -)

  • Kim, Pyoung-Su;Ahn, Won-Yung
    • Journal of the Korean Wood Science and Technology
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    • v.24 no.1
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    • pp.87-94
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    • 1996
  • 한국산 동백나무겨우살이(Pseudixus japonicus) 추출물의 암치료를 위한 생약으로서 활성 유효성을 검증하기 위하여 메탄올, 석유에테르, 클로로포름, 초산 에틸 용매로 순차적으로 추출하여 겨우살이 추출물의 다섯 가지 분획을 얻어, 이에 대하여 in vitro로 1차와 2차 검색 시스템을 사용해 항암활성 성분을 체계적으로 검색하였다. 다섯 가지 분획 중 클로로포름 가용성 분획이 1차 검색 세포인 $P388D_1$에 대해 가장 높은 항암활성을 나타내어 MSB1, NIH/3T3, SNU-1, SNU-C2A 등 2차 검색 시스템에 대해 클로로포름 가용성 분획의 항암활성을 다양한 농도하에서 비교 검색하였다. 혈액암 세포중 특히 $P388D_1$의 생장이 클로로포름 추출물에 의해 강하게 저해되었으며, 형질전환된 생쥐의 태아 섬유아세포와 사람의 대장암, 위암세포들도 어느 정도의 생육저해를 나타내었다. 이 클로로포름 가용성 분획의 주성분은 원소분석, 발색시약과의 반응, IR, GC-MS, $^{13}C$-NMR의 스펙트럼의 결과로 세 종류의 알칼로이드 화합물로 확인되었고, 부성분으로는 지방산 메틸 에스테르와 프탈라이드 화합물이 MS 스펙트럼을 통해 동정되었다.

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Thermal Rearrangement of 1,1-Disubstituted 2-Vinylcyclopropanes to 4,4-Disubstituted Cyclopentenes (두 치환체를 가진 비닐시클로프로판의 시클로펜텐으로의 열적자리 옮김반응)

  • Iwhan Cho;Kwang-Duk Ahn
    • Journal of the Korean Chemical Society
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    • v.22 no.3
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    • pp.158-163
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    • 1978
  • The four 1,1-disubstituted 2-vinylcyclopropanes, 1,1-diphenyl-2-vinylcyclopropane (1a), 1,1-dicyano-2-vinylcyclopropane(1b), ethyl 1-cyano-2-vinylcyclopropanecarboxylate(1c), and diethyl 2-vinylcyclopropane-1,1-dicarboxylate(1d) rearranged below $300{\circ}C$ to the corresponding 4,4-disubstituted cyclopentenes, 4,4-diphenylcyclopentene(2a), 3-cyclopentene-1,1-dicarboxylate(2d). Diphenpyl derivative 1a rearranged almost quantitatively to 4,4-diphenylcyclopentene(2a) at the temperature of $250{\circ}C$. Although dicyano derivative 1b in solution underwent the thermal rearrangement at rather low temperature of $170{\circ}C$, the other vinylcyclopropanes, 1c and 1d, in solution rearranged thermally above $220{\circ}C$. In the thermal reaction of 1b, 1c, and 1d considerable amounts of polymers 3 were also produced. Also detected product was the ring-opened diene, ethyl 2-cyano-2,4-hexadienoate(4), in case of the pyrolysis of 1c. The observed facile rearrangement of disubstituted vinylcyclopropanes was explained by the radical stabilization effect of substituents on the diradical intermediates 5.

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Retention Behavior and Separation of Phenol Derivatives through Cyclodextrin Complexes in Reversed-Phase Liquid Chromatography (역상 액체 크로마토그래피에서 씨클로덱스트린 착물을 이용한 페놀유도체들의 머무름 거동 및 분리)

  • Moon, Young-Ja;Kang, Sam-Woo
    • Analytical Science and Technology
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    • v.11 no.3
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    • pp.179-188
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    • 1998
  • The capacity factor of fifteen phenol derivatives was determined with respect to the concentration of ${\alpha}$- or ${\beta}$-cyclodextrin [CD], the type as well as the content of organic solvent in the mobile phase, and the temperature. The effect of the inclusion complex formation between solutes and ${\alpha}$- or ${\beta}$-cyclodextrin on their retention and selectivity has been investigated. The inclusion effect of ${\beta}$-cyclodextrin was the most effective in aqueous methanol, whereas only a poor effect was observed in aqueous tetrahydrofuran and aqueous acetonitrile. A plot of the reciprocal of the capacity factor against $[CD]_T$ gives a straight line and the dissociation constant, $K_D$ of the inclusion complex can be calculated from the slope. It was possible to estimate the $k_D$ values in 100% water from a linear plot of $pK_D$ vs. water content in the solution by extrapolation. The separation factor, ${\alpha}$, of two compounds has been found to be affected not only by the $[CD]_T$ but also by their $K_D$ values. Under optimum conditions, some mixtures of phenol derivatives were able to separate successfully.

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Optimization of the Cloth Simulation Pipeline in Production of 3D Computer Animation (3D 컴퓨터 애니메이션 제작에서 Cloth Simulation 을 위한 제작파이프라인의 최적화)

  • Kwak, Dong-Min;Choi, Chul-Yong;Kim, Ki-Hong;Lee, Dong-Hoon
    • The Journal of the Korea Contents Association
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    • v.9 no.8
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    • pp.198-207
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    • 2009
  • Recently, it was possible to represent the realistic clothes in the cloth simulation along with growth of 3D computer animation such as visual contents. In addition, because of the development of H/W(Hardware) and S/W(Software), the accessibility and participation are growing. However, in order to make the image of high quality of 3D animation, the optimized production pipeline was need. In this paper, in order to overcome the limitation of exiting 3D computer animation production pipeline, we propose the optimized production pipeline of the cloth simulation. Our production pipeline makes the optimization arrangement in consideration of the mobility in order to supplement the related structure limit toward each part of the existing pipeline. Moreover, by utilizing the dummy cloth the association nature with the animation part is solved and a performance is improved. The proposal pipeline actually introduced to the animation production. And then we can improve the performance production time and production manpower consumption. Consequently, our pipeline is guaranteed an optimized work by emphasizing a connection in the direct image production.

A Solid Phase Synthesis of Dihydro-1,4-dioxin and Dihydro-1,4-oxathiin Carboxanilides Using Polymer-bound Oxime Ester (고체상에 연결된 옥심 에스테르를 이용한 다이하이드로-1,4-다이옥신 및 다이하이드로-1,4-옥사티인 카르복스아닐라이드 유도체의 고체상 합성)

  • Hahn, Hoh-Gyu;Bae, Su-Yeal;Nam, Kee-Dal
    • The Korean Journal of Pesticide Science
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    • v.10 no.1
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    • pp.1-6
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    • 2006
  • A methodology for the syntheses of carboxanilides using solid support of 4-chloro-3-nitorbenzophenone oxime resin 5 was developed. Condensation of 4-chloro-3-nitorbenzophenone resin 6 with hydroxylamine hydrochloride salt gave oxime resin 5. The reaction of oxime resin 5 with dioxin and oxathiin derivatives 7a-d afforded the corresponding polymer-bound dioxin and oxathiin derivatives 9a-d. These polymer-bound resins 9a-d were treated respectively with aniline in the presence of acetic acid resulted in the corresponding dioxin carboxanilides 10a-d (yield, 5%-quantitative).

CLOVES: a Virtual World Builder for Constructing Virtual Environments for Science Inquiry Learning (클로브스: 과학 탐구 학습을 위한 가상환경 저작도구)

  • Cho Yong-joo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.2
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    • pp.268-276
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    • 2005
  • This paper presents the motivation, design, and a preliminary evaluation of a virtual world builder, CLOVES. CLOVES is designed to support rapid construction of data-rich virtual environments and instruments for young children's science inquiry teaming. It provides a three-tiered programming Interface: a visual design environment, scripting layer, and low-level application programming interface targeting for multiple levels of programming expertise. It is also intended to be a collaborative medium among interdisciplinary domain experts such as educators, 3D modelers and software developers. A preliminary case study was conducted to evaluate the capabilities and effectiveness of CLOVES. The results showed that designers actively participated in decision making at every stage of the design process and shared knowledge among one another.

Active Noise Control of 3D Enclosure System using FXLMS Algorithm (FXLMS 알고리즘을 이용한 3 차원 인클로저 시스템의 능동소음제어)

  • Oh, Jae-Eung;Yang, In-Hyung;Yoon, Ji-Hyun;Jung, Jae-Eun;Lee, Jong-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.240-241
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    • 2009
  • The method of the reduction of the duct noise can be classified by the method of passive control and the method of active control. However, the passive control method has a demerit to reduce the effect of noise reduction at low frequency (below 500Hz) range and to be limited by a space. Whereas, the active control method can overcome the demerit of passive control method. The algorithm of active control is mostly used the Least-Mean-Square (LMS) algorithm because the LMS algorithm can easily obtain the complex transfer function in real-time. Especially, When the Filtered-X LMS (FXLMS) algorithm is applied to an ANC system.

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Review / Seal online -나를 즐겁게 하는 게임

  • Park, In-O
    • Digital Contents
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    • no.8 s.123
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    • pp.60-61
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    • 2003
  • 3차에 걸친 클로즈 베타테스트를 성공적으로 마치고 지난달 16일 오픈 베타베스트에 들어간 '씰 온라인'은 그리곤 엔터테인먼트에서 2000년에 출시한 패키지 게임 '씰(seal)'의 세계관을 계승한 풀 카툰렌더링 3D 온라인 게임이다.

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Development of Polymer-derived Silicon Carbide Fiber with Low Oxygen Content Using a Cyclohexene Vapor Process (싸이클로헥센 증기 공정에 의한 산소량이 적은 실리콘카바이드 섬유의 개발)

  • Yoon, Byungil;Choi, Woo Chul;Kim, Myeong Ju;Kim, Jae Sung;Kim, Jung il;Kang, Hong Gu
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.5
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    • pp.620-632
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    • 2017
  • A chemical vapor curing method(CVC) was developed to cure polycarbosilane(PCS) fibers by using cyclohexene vapour as a non-oxygen active reactant, instead of air in oder to prepare the silicon carbide(SiC) fiber with low oxygen content. A cross-linked PCS fibers by cyclohexene vapor showed a completely different variation in IR spectra in comparison to the air-cured PCS fiber. CVC method resulted in less than 3 wt% in oxygen content. In this experiment conditions, The average tensile strength and modulus of SiC fiber obtained by CVC had 1995 MPa and 183 GPa respectively, which is higher than that of SiC fiber prepared by air-curing process.