• Title/Summary/Keyword: structure-H

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Liquid viscosities of binary mixtures and some hydrocarbons in the high pressure range with applications of the significant structure theory

  • Jun Su Bhang;Sang Joon Hahn;Mu Shik Jhon
    • Journal of the Korean Chemical Society
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    • v.14 no.2
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    • pp.193-199
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    • 1970
  • Further validity of the significant structure theory has been tested by calculating the viscosities of binary mixtures-three pairs of $C_6H_6(1)+C_6H_{12}\;(2),\;CCI_4\;(1)+C_6H_6{2}and\l;CCI_4(1)+C_6H_{12}(2)$-and also by calculating the viscosities of n-$C_5H_{12}\;and\;n-C_6H_{14}$ in the pressure range of 1 bar to 4000 bars. The results are quite satisfactory for both cases and provide another evidence for the validity of the significan structure theory.

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A Parallel Pipeline Execution Algorithm for H.264/AVC Intra Prediction (H.264/AVC의 인트라 예측 병렬 파이프라인 실행 알고리즘)

  • Xu, Jia-Yue;Cho, Hyo-Moon;Cho, Sang-Bock
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.45 no.5
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    • pp.79-86
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    • 2008
  • H.264/AVC is the newest international video coding standard developed by the joint ITU-T and ISO/IEC standards organizations. This newest video coding standard offers much higher coding efficiency than the H.261, H.263 and MPEG-4. But it has high computing complexity and high H/W resources wasting problem. This paper described the two unit parallel pipeline structure. This new structure comparing with standard model decreased the computing complexity of 67% and the H/W resources waste of 3%.

The Optimum Design of the Light-weight Composite Pallet Plank for Assembly Line of LCD/PDP by using Honeycomb Sandwich Panel (하니컴 샌드위치 Panel을 이용한 LCD/PDP생산공정용 고기능성 복합 신소재 파렛트의 최적설계)

  • Kim, Y.H.;Choi, B.G.;Son, J.H.;Cho, Y.D.;Eum, S.H.;Woo, B.H.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.388-394
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    • 2005
  • A typical honeycomb sandwich panel consists of two thin, high-strength facings bonded to a thick, light-weight core. Each component by itself is relatively weak and flexible, but when it combind in a sandwich panel they produce a structure that is stiff, strong, and lightweight. In addition to use in honeycomb sandwich panels, honeycomb is used for energy absorption, radio frequency shielding, light diffusion, and to direct air flow.Accordingly, the usage of honeycomb sandwich structure is very widely applied to the aircraft, the automobile, and marine industry, etc., because of these advantages. Generally, this honeycomb sandwich structure is manufactured by autoclave process.In this study, the honeycomb sandwich structure was produced by prepreg. To prove the suitability the honeycomb sandwich structure with prepreg, The optimum design of the skin materials and honeycomb sandwich structure were evaluated with the theory of stress analysis.

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A Study on Vibration Control of Multi-layer Structure by $H_{\infty}$ Control ($H_{\infty}$ 제어기법에 의한 다층 층상 구조물의 진동제어에 관한 연구)

  • 정해종;김창화;변정환;양주호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.04a
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    • pp.293-300
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    • 1997
  • This paper is concerned with the vibration control of multi-layer structure for ultra-tall buildings and main tower of large bridge etc. We have modeled the multi-layer structure with the distributed mass system as the lumped mass system of two-degree-of-freedom structure and made experimental equipment. The H$_{\infty}$ control theory is applied to the design of the control system. The designed control system is simulated by computer. As a result, the designed H$_{\infty}$ controller showed good vibration control performance to impact excitation and the good frequency response.e.

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Structure of an Antimicrobial Peptide Buforin II

  • Yi, Gwan-Su;Park, Chan-Bae;Kim, Sun-Chang;Chaejoon Cheong
    • Proceedings of the Korean Biophysical Society Conference
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    • 1996.07a
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    • pp.29-29
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    • 1996
  • The structure of an antimicrobial peptide buforin II has been studied by $^1$H NMR and CD spectroscopy. Buforin II is flexible and random structure in H$_2$O but the parts of buforin II become helical structure in trifluoroethanol (TFE)/H$_2$O (1:1, v/v) solution. From the restrained molecular dynamics calculation using NMR data, we obtained the possible conformation of buforin II in TFE/H$_2$O solution. (omitted)

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The Crystal and Molecular Structure of Carbutamide, ($C_11H_17N_3O_3S$) (Carbutamide ($C_11H_17N_3O_3S$)의 결정및 분자구조)

  • 구정회;조성일;연양희
    • YAKHAK HOEJI
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    • v.26 no.1
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    • pp.9-23
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    • 1982
  • The structure of 1-butyl-3-sulfanyl urea, ($C_{11}H_{17}N_{3}O_{3}S$) carbutamide has been determined from 575 significant independent reflections collected on an automated four-circle diffractometer. The crystals are orthorhomic, space group, $P2_{1}2_{1}2_{1}$, Z=4, with unit cell dimensions a=9.257 (2), b=9.928 (2), c=15.287 (3)${\AA}$. The structure was solved by the direct methods and refined by least-squares procedure to a final R value of 0.062. Features of the structure include layers of molecules joined by N-H....O hydrogen bond distances ranging from 2.745 to 3.100${\AA}$ involved in a bifurcated hydrogen bond across two fold screw along a and b axes. The atoms forming the urea system are essentially planar.

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The effect of precursor solution pH on the energy storage performance of 𝛼-MnO2 cathode for zinc-ion batteries synthesized via hydrothermal method (Zn 이온 배터리용 양극 𝛼-MnO2의 수열 합성 시 전구체 용액의 pH가 에너지 저장 성능에 미치는 영향)

  • Sang-Eun Chun
    • Journal of the Korean institute of surface engineering
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    • v.57 no.4
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    • pp.338-347
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    • 2024
  • 𝛼-MnO2 as a cathode material for Zn-ion batteries allows insertion and extraction of Zn ions within its tunnel structure during charge and discharge. The morphology and crystal structure of 𝛼-MnO2 particles critically determine their electrochemical behavior and energy storage performance. In this study, 𝛼-MnO2 was synthesized from precursor solutions under varying pH conditions using a hydrothermal method. The effects of pH values on the morphology, crystal structure, and electrochemical performance were systematically analyzed. The analysis revealed that materials synthesized at higher pH levels exhibited elongated and narrow nanorods with a lower specific surface area. In contrast, those formed at lower pH levels showed shorter, thicker nanorods with a higher specific surface area. This increased surface area at a lower pH enhanced the specific capacitance by providing a greater electrode/electrolyte interfacial area. By contrast, the material synthesized at higher pH conditions demonstrated superior rate capability, attributed to its crystal structure with wider lattice spacings. Wide lattice parameters in the material synthesized at higher pH conditions facilitated easier ion transport than at lower pH levels. Consequently, the study confirms that adjusting the pH of the precursor solution can optimize the electrochemical properties of 𝛼-MnO2 for Zn-ion batteries.

Decentralized H$\infty$Controller Design-reduced order observers approach

  • Jo, Cheol H.;Lee, Sang-Hyek;Seo, Jin H.
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10a
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    • pp.52-55
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    • 1996
  • In this paper, we consider the decentralized reduced-order H$_{\infty}$ controller for the general plant. Simplifying method is suggested for the general plant with the decentralized controller structure. When the controller is reconstructed for the original system, the decentralizability of the controller for the transformed system is generally destroyed with the older method. We solve this problem. For the simplified system, the structure of the decentralized controller is suggested..

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