• Title/Summary/Keyword: Monolithic

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Microstructure and Strength Property of Liquid Phase Sintered $SiC_f$/SiC Composites (액상소결 $SiC_f$/SiC 복합재료의 미세조직 및 강도특성)

  • Lee, Moon-Hee;Cho, Kyung-Seo;Lee, Sang-Pill;Lee, Jin-Kyung
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.234-238
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    • 2008
  • The efficiency of fiber reinforced CMC(ceramic matrix composite) on the SiC materials have been investigated, in conjunction with the fabrication process by liquid phase sintering and the characterization. LPS-$SiC_f$/SiC composites was studied with the detailed analysis such as the microstructure, sintered density, flexural strength and fracture behavior. The applicability of carbon interfacial layer has been also investigated in the LPS process. Submicron SiC powder with the constant total amount and composition ratio of $Al_2O_3,\;Y_2O_3$ as sintering additives was used in order to promote the performance of the SiC matrix material. LPS-$SiC_f$/SiC composites were fabricated with hot press under the sintering temperature and applied pressure of $1820^{\circ}C$ and 20MPa for 1hr. The typical property of monolithic LPS-SiC materials was compared with LPS-$SiC_f$/SiC composites.

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A Study of Application Development Method for Improving Productivity on Cloud Native Environment (Cloud Native환경에서의 생산성 향상을 위한 어플리케이션 개발 방법 연구)

  • Kim, Jung-Bo;Kim, Jung-In
    • Journal of Korea Multimedia Society
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    • v.23 no.2
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    • pp.328-342
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    • 2020
  • As the cloud-based ICT(Information & Communication Technology) infrastructure matures, the existing monolithic software development method is evolving into a micro-service structure based on cloud native computing. To develop and operate the services efficiently under the cloud native environment, DevOps-based application development plans through MSA(Micro Service Architecture) design based are essential. A cloud native environment is an approach to developing and running applications that take advantage of cloud computing models such as automation of source distribution, container-based virtualization, application scalability, resource efficiency, and flexible maintenance through object independence. To implement this approach, the utilization of key elements such as DevOps, continuous delivery, micro service, and containers is essential, but there are not enough previous studies on case analyses or application methods of these key elements. Therefore, in this paper, we analyze the cases of application development in cloud native environment and propose the optimized application development process and development method through small and medium-sized SI projects.

A Study for Development Plan of SAR Core Technology Through Technology Readiness Level Survey and Analysis (기술 수준조사 및 분석을 통한 SAR(합성개구면 레이다) 핵심기술 개발방안 연구)

  • Kwak, Jun-Young;Jeong, Dae-Gwon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.4
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    • pp.655-662
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    • 2011
  • SAR(Synthetic Aperture Radar) has the ability to generate high resolution images regardless of a weather condition(e.g. visibility good or poor and day or night, etc.). SAR is considered as one of the most important powers and needs for the future since it has been utilized in a number of important military fields such as early warning, urban defense, missile guidance system, etc. Additionally there are many civilian demands and applications in aviation, traffic control, earth and space explorations, weather forecast etc. This days, the ability to acquire and analyze information is needed to cope with the urgency of global politics and international changes. In this paper, technical survey and development review for SAR systems are investigated to derive the core and immature technologies of domestic defense industry.

Design of a Single Pulse Laser Range Finder with Er:Yb:glass Microchip Lasers (어븀:이터븀:유리 마이크로칩 레이저를 이용한 단펄스 거리측정기 설계)

  • Koh, Hae Seog;Lee, Chang Jae;Park, Choong Bum;Jeon, Hyoung Ha;Ahn, Pil Dong;Park, Do Hyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.3
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    • pp.295-305
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    • 2018
  • We present a passively Q-switched monolithic Er:Yb:glass microchip laser developed in our lab. The microchip laser can produce pulses at 1535 nm of the 'eye-safe' wavelengths with the pulse energy of 50 uJ and the pulse width of 4-6 ns. Using the laser we also designed and developed a pulsed Er:Yb:glass microchip laser rangefinder. Expressions for background and signal power, noise, and signal-to-noise ratio are reviewed. A computer simulation was used to optimize laser power, receiver aperture, and preamplifier bandwidth for the efficient system design of the laser rangefinder. Experimental results are presented to compare with the theory.

Effects of Laminate Structures on Impact Properties of Laminate Composites (적층복합재료의 충격특성에 미치는 적층구조의 영향)

  • Park, Won-Jo;Huh, Sun-Chul;Lee, Sang-Pill;Yoon, Han-Ki;Lee, Kwang-Young
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.363-369
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    • 2001
  • By alternating $Al_{18}B_4O_{33}$/AC4CH composites with Al1050 sheets and then hot pressing, MMC/Al laminate composites have been successfully fabricated as parameters of the laminate structure and the number of Al sheet. Impact properties for laminate composites have been evaluated both in the laminate structure and in the impact load direction. Lamination of Al sheet and MMC layer showed a remarkable improvement in the absorbed impact energy compared to that of monolithic MMC. Laminate composites mounted with Al sheet at the outside of the configuration had a higher impact energy in the edge wise compared to that with Al sheet at the inside. Furthermore, there was an anisotrpy in the impact value of laminate composites, that is, impact values for the flat wise in a constant volume fraction of Al sheet dramatically increased along with Al sheet number, even if impact values fur the edge wise were nearly constant.

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Equivalent Mechanical and Thermal Properties of Multiphase Superconducting Coil Using Finite Element Analysis (유한요소해석을 이용한 다상의 초전도 코일에 대한 기계적 열적 등가 물성)

  • Sa, J.W.;Her, N.I.;Choi, C.H.;Oh, Y.K.;Cho, S.;Do, C.J.;Kwon, M.;Lee, G.S.
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.975-980
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    • 2001
  • Like composite material. the coil winding pack of the KSTAR (Korea Superconducting Tokamak Advanced Research) consist of multiphase element such as metallic jacket material for protecting superconducting cable, vacuum pressurized imprepregnated (VPI) insulation, and corner roving filler. For jacket material, four CS (Central Solenoid) Coils, $5^{th}$ PF (Poloidal Field) Coil, and TF (Toroidal Field Coil) use Incoloy 908 and $6-7^{th}$ PF coil, Cold worked 316LN. In order to analyze the global behavior of large coil support structure with coil winding pack, it is required to replace the winding pack to monolithic matter with the equivalent mechanical properties, i.e. Young's moduli, shear moduli due to constraint of total nodes number and element numbers. In this study, Equivalent Young's moduli, shear moduli, Poisson's ratio, and thermal expansion coefficient were calculated for all coil winding pack using Finite Element Method.

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Design of Planar Power Divider Combiner for K-Band and Improvement of Impedence Matching Condition (K-밴드 평면형 Power Divider / Combiner와 정합특성에 관한 연구)

  • 나극환;홍의석;강준길;김춘길
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.6
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    • pp.579-589
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    • 1989
  • In this paper, planar power dividers/combiners for millimeter waves K-band or bands which can be printed on the substrates of hybrid or monolithic IC by surface mounting are designed and studied. Power dividers/combiners, and the conductor loss of microstrip lines in particualr the existing Wilkinson power dividers/combiners is modified ad amployes by ist equivalent circuit. Microwave CAD program SUPEROMPACT is employed for the Wilkinson power combiner which is modified and analyzed to reduce the high frequency coupling between the branches of the combiner, and the method to diminish the sensitivity of the input reflection of $2^n$-way power dividers/combiners is studied employing the commerical microwave CAD program package SUPERCOMPACT.

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The Design Simulation for Manufacture of High Frequence Ceramic Filter (고주파용 세라믹 필터의 제작을 위한 디자인 해석)

  • Lee, S.H.;Seok, J.Y.;Ryu, G.H.;SaGong, G.;Yoon, K.H.;Yoo, J.H.;Park, C.Y.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.418-421
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    • 2001
  • The ceramic filters were developed using technology similar to that of quartz crystal and electromechanical filter. However, the key to this development involved the theoretical analysis of vibration modes and material improvements of piezoelectric ceramics. The primary application of ceramic filters has been for consumer-market use. Accordingly, a major emhpasis has involved mass production technology, leading to low-priced devices. A typical ceramic filter includes monolithic resonators and capacitors packaged in unique configurations. Nakazawa developed a double-mode resonator as two acoustically coupled single resonators. And he developed 10.7MHz crystal filters using multi-energy trapping mode of thickness shear vibration. He succeeded in realizing a two-pole band pass filter response without external inductance by splitting a dot electrode to creat coupled symmetric and antisymmetric vibration modes. Accordingly, the simulation for ceramic filter were important. So that, this paper were investigated the pass frequency of filter on the electrode length and thickness of ceramic.

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A Ternary Polymeric Matrix System for Controlled Drug Delivery of Highly Soluble Drug with High Drug Loading : Diltiazem Hydrochloride (염산 딜티아젬의 방출을 제어하기 위한 삼중 폴리머 매트릭스 시스템)

  • Kim, Hyun-Jo;Fassihi, Reza
    • Journal of Pharmaceutical Investigation
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    • v.31 no.1
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    • pp.19-25
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    • 2001
  • The purpose of this study was to use a ternary polymeric matrix system for high drug loading of a highly soluble drug for controlled release delivery. The controlled drug delivery of diltiazem HCl (solubility > 50% in water at $25^{\circ}C$) with high loading dose (the final loading dose of drug was 34%) from a ternary polymeric matrix (gelatin, pectin, HPMC) was successfully accomplished. This simple monolithic system with 240 mg drug loading provided near zero-order release over a 24 hour-period by which time the system was completely dissolved. The release kinetics of diltiazem HCl tablet with high loading dose from the designed ternary polymeric system was dependent on the ratios of HPMC : pectin binary mixture. The release rate increased as pectin : HPMC ratio were increased. Swelling behavior of the ternary system and the ionic interaction of formulation components with cationic diltiazem molecule appear to control drug diffusion and the release kinetics. Comparable release profiles between commercial product and the designed system were obtained. The binding study between gelatin with diltiazem HCl showed the presence of two binding sites for drug interaction with subsequent controlled diffusion upon swelling. This designed delivery system is easy to manufacture and drug release behavior is highly reproducible and offers advantages over the existing commercial product.

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An Effective Visualization of Intricate Multi-Event Situations by Reusing Primitive Motions and Actions

  • Park, Jong Hee;Choi, Jun Seong
    • International Journal of Contents
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    • v.15 no.4
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    • pp.16-26
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    • 2019
  • The efficient implementation of various physical actions of agents to respond to dynamically changing situations is essential for the simulation of realistic agents and activities in a cyber world. To achieve a maximum diversity of actions and immediate responsiveness to abrupt changes in situations, we have developed an animation technique in which complex actions are recursively constructed by reusing a set of primitive motions, and agents are designed to react in real-time to abrupt ambient changes by computationally satisfying kinematic constraints on body parts with respect to their goals. Our reusing scheme is extended to visualize the procedure of realistic intricate situations involving many concurring events. Our approach based on motion reuse and recursive assembly has clear advantages in motion variability and action diversity with respect to authoring scalability and motion responsiveness compared to conventional monolithic (static) animation techniques. This diversity also serves to accommodate the characteristic unpredictability of events concurring in a situation due to inherent non-determinism of associated conditions. To demonstrate the viability of our approach, we implement several composite and parallel actions in a dynamically changing example situation involving events that were originally independent until coincidentally inter-coupled therein.