• 제목/요약/키워드: mass property

검색결과 530건 처리시간 0.029초

A Study on an Effective Process Strategy Model of Interactive Advertising in Smart Media

  • Ahn, Jong Bae
    • International Journal of Internet, Broadcasting and Communication
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    • 제12권1호
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    • pp.45-54
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    • 2020
  • One of the typical characteristics of smart media is that it is interactive, which shows a different form and property from the existing mass media, and also changes the way users use it. This change requires a different system from the existing method in the advertising process strategic model for effective interactive advertising in smart media. We attempted to derive an effective smart media interactive advertising process strategic model by understanding the interactive advertising processin smart media that is expected to continue to grow asthe main market of the advertising market and identifying the constituent factors. To this end, We analyzed the preminiary research results of interactive advertising and organized expert panels for the Delphi method and reflected their opinions and evaluations. The components and factors of interactive advertising were found and the effective interactive advertising process strategy model in smart media was derived from this study.

An atomistic model for hierarchical nanostructured porous carbons in molecular dynamics simulations

  • Chae, Kisung;Huang, Liping
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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    • pp.403.2-403.2
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    • 2016
  • Porous materials play a significant role in energy storage and conversion applications such as catalyst support for polymer electrolyte membrane fuel cell. In particular, hierarchical porous materials with both micropores (poresize, ${\delta}$ < 2 nm) and regularly arranged mesopores (2 nm < ${\delta}$ < 50 nm) are known to greatly enhance the efficiency of catalytic reactions by providing enormous surface area as well as fast mass transport channels for both reactants and products from/to active sites. Although it is generally agreed that the microscopic structure of the porous materials directly affects the performance of these catalytic reactions, neither detailed mechanisms nor fundamental understanding are available at hand. In this study, we propose an atomistic model of hierarchical nanostructured porous carbons (HNPCs) in molecular dynamics simulations. By performing a systematic study, we found that structural features of the HNPC can be independently altered by tuning specific synthesis parameters, while remaining other structures unchanged. In addition, we show some structure-property relations including mechanical and gas transport properties.

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Closed-form solutions for non-uniform axially loaded Rayleigh cantilever beams

  • Sarkar, Korak;Ganguli, Ranjan;Elishakoff, Isaac
    • Structural Engineering and Mechanics
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    • 제60권3호
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    • pp.455-470
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    • 2016
  • In this paper, we investigate the free vibration of axially loaded non-uniform Rayleigh cantilever beams. The Rayleigh beams account for the rotary inertia effect which is ignored in Euler-Bernoulli beam theory. Using an inverse problem approach we show, that for certain polynomial variations of the mass per unit length and the flexural stiffness, there exists a fundamental closed form solution to the fourth order governing differential equation for Rayleigh beams. The derived property variation can serve as test functions for numerical methods. For the rotating beam case, the results have been compared with those derived using the Euler-Bernoulli beam theory.

골격근의 노화에 대한 고찰 (A Review of Journals on the Aging Skeletal Muscle)

  • 권오봉;송윤경;임형호
    • 대한추나의학회지
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    • 제4권1호
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    • pp.55-65
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    • 2003
  • The purpose of this article was to contribute to the knowledge of physiological and pathological changes of aging skeletal muscles, and of therapic method. By aging there were changes of distribution of muscle fibers, the loss of muscle mass, the loss of the number of muscle fibers, the loss of glycolysis capacity, the decrease of the oxidative enzymes and muscle vascularization in the skeletal muscles. And as a pathological change, the exhaustive maximal exercise increased oxidative stress that led to oxidative damage which were shown to be implicated in promoting aging. The property of intensity and duration exercise is important not only in keeping human health and physical fitness from oxidative stress, but also for the maintenance of well-being and quality of life.

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ROCK TEST HAMMER 측정결과의 활용에 관하여 (A Study on the Application of Measured Results by Rock Test Hammer)

  • 이영남;윤지선;김두영
    • 터널과지하공간
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    • 제3권2호
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    • pp.167-174
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    • 1993
  • Index tests are useful because they are rapid and cheap-and if bias is known the fundamental property can be estimated, as when estimating the compressive strength or the tensile sterngth from the rock test hammer value. Index tests which have proved to be very useful are the rock test hammer, the point load test and sonic velocity test. These can provide index values in their owing right or be used to estimate the compressive strength, the tensile strength and elastic modulus. Because of the heterogeneous and fractured nature of rock, many index tests have been developed for a variety of purposes, e.g.for use in rock mass classification schemes.

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Characterization of 1,4-Benzoquinone Reductase from Bovine Liver

  • Kim, Kyungsoon
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제7권4호
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    • pp.216-220
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    • 2002
  • 1,4-Benzoquinone reductase was purified to electrophoretic homogeneity from bovine liver, and the purified enzyme found to have a molecular mass of 29 kDa, as determined by sodium dodecyl sulfate- polyacrylamide gel electrophoresis The enzyme exhibited pH optimum between 8.0 and 8.5. The apparent fm for 1,4-benzoqulnone was 1.643 mM, and the apparent Km for NADH was 1.837 mM. Various divalent cations, such as Hg$\^$2+/, Cu$\^$2+/, and Zn$\^$2+/, exhibited strong inhibitory effects. The enzyme activity was also strongly inhibited by quercetin, dicumarol, and benzoic acid. Incubation of the enzyme with N-bromosuccinimide and pyridoxal 5’-phosphate led to inhibitions of 100% and 99%, respectively. Accordingly, these results suggest that trypto-phan and Iysine residues are Involved at or near the active sites of the enzyme.

폐석회석의 분말도 변화에 따른 콘크리트의 특성분석 (An Analysis on Concrete Properties with the Fineness of Waste Limestone)

  • 류현기;우종권
    • 한국건축시공학회지
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    • 제7권1호
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    • pp.85-90
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    • 2007
  • According as industry develops rapidly, problem of resources exhaustion and environmental pollution is appearing. Way to use construction waste that is development of new compound material and Industry product is required. Limestone powder that is Industry product is $CaCO_3$. and vicosity is promotion effect because there is no damage to hydration of cement and powder is very thin and water tightness increases. This research purposed to analyze concrete property changing limestone fineness. According as the limestone powdered replacement ratio increases, slump and unit capacity mass increased, and the air content decreased according as the replacement ratio increases. Compressive strength and tensile strength decreased according as the limestone powder replacement ratio increases.

기어강성을 갖는 2-자유도 포신 안정화시스템에서 FXLMS 알고리즘을 이용한 외란 보상 제어기 설계 (Disturbance Compensation Control Design far 2-DOF Gun Stabilization System with Gear Stiffness by Using FXLMS Algorithm)

  • 임재근;강민식
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 춘계학술대회논문집
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    • pp.488-493
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    • 2005
  • In gun stabilization systems, the torque comes from the unbalance mass of gun and the base acceleration is an important source of disturbance which degrades stabilization performance. Fatigue of gear train is another important factor affecting structural safety problems. In this paper, a feedback control gain is designed by optimal control weighting to difference between motor and gun velocity, and a feedforward controller using FXLMS algorithm is adopted to investigate those problems. Experimental results show that the feedforward compensator based on FXLMS can reduce the disturbance effects. The directional convergence property according to initial conditions of the FXLMS is also shown through experiments.

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개방형 금형을 이용한 유리 렌즈 성형 해석 (Finite Element Analysis of Glass Lens Forming Process Using Open Die)

  • 나진욱;임성한;전병희;오수익
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2003년도 춘계학술대회논문집
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    • pp.143-147
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    • 2003
  • Despite of outstanding optical performance of glass lens, glass lens have not been widely used because of poor productivity and high cost due to manufacturing process i.e. grinding, polishing. However, press-forming method of glass lens overcomes this disadvantage because of mass production. When glass lens is produced by press-forming method using closed die, it is needed that the volume of glass lens preform precisely measured in order to prevent incomplete products and to increase in life of die. The present paper shows the shortcoming of forming process with closed die, and performs FEM simulation of forming process with open die in order to overcome this shortcoming. The design parameter of open die is selected in standard of assembly with optical module and maintenance of optical performance. FEM simulation is carried out with selected parameter of open die and two basic preform. According to distribution of effective strain in glass lens, optical property of glass lens formed at each set of die and preform is compared.

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Calculation of Equivalent Feeder Geometries for CANDU Transient Simulations

  • Cho, Seungyon;Muzumdar, Ajit
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1995년도 추계학술발표회논문집(1)
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    • pp.429-436
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    • 1995
  • This paper describes a methodology for determination of representative CANDU feeder geometry and the pressure drops between inlet/outlet header and fuel channel in the primary loop. A code, MEDOC, was developed based on this methodology and helps perform a calculation of equivalent feeder geometry for a selected channel group on the basis of feeder geometry data (fluid volume, mass flow rate, loss factor) and given property data pressure, quality, density) at inlet/outlet header. The equivalent feeder geometry calculated based on this methodology will be useful fur the transient thermohydraulic analysis of the primary heat transport system for the CANDU heavy water-cooled pressure tube reactor.

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