• Title/Summary/Keyword: Resilient design

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Production and properties of cross-linked recombinant pro-resilin: an insect rubber-like biomaterial

  • Kim, Mi-Sook;Elvin, Chris;Lyons, Russell;Huson, Mickey
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.256-256
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    • 2006
  • The design and synthesis of novel biomolecular materials, based on mimicking the properties of molecules found in nature, is providing materials with unusual properties. Resilin serves as an energy storage material in insects and facilitates flight, jumping (in fleas, froghoppers etc) and sound production (cicadas, etc). Resilin is initially produced as a soluble protein and in its mature form is crosslinked through formation of dityrosine units into a very large insoluble polymer. In the present study, we have synthesized a recombinant form of resilin that can be photochemically cross-linked into a resilient, rubber-like biomaterial that may be suitable for spinal disc implants. This material is almost perfectly elastic and its fatigue lifetime in insects must be >500 million cycles.

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Fire Resistance Performance of FRP Rebar Reinforced Concrete Columns

  • Wang, Hui;Zha, Xiaoxiong;Ye, Jianqiao
    • International Journal of Concrete Structures and Materials
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    • v.3 no.2
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    • pp.111-117
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    • 2009
  • Concrete columns reinforced with Fibre Reinforced Polymer (FRP) rebar have been increasingly used in civil engineering applications, while the research on fire resistance of such structural members is still very limited. In this paper, attempts are made to predict temperature distribution and mechanical performance of FRP rebar reinforced concrete columns in fire. The effect of concrete cover and section size on fire resistance time is studied by the finite element method. Based on a parametric study, a simple empirical formula to predict fire resistance time is proposed for possible adoption in fire resistance design.

NC 공작기계 이송 구동계의 모델링과 제어

  • 김호기
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1996.10a
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    • pp.34-39
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    • 1996
  • In many industrial applicatiosns such as machine tools and automation equipments the control performance of the feed-drive systems as positioning devices of the tools and workpieces have great influences on the quality of related machines. For many electrically driven mechanical feed systems resilient couplings between motors and mechanical elements which mostly consist of elasttic shafts and gears often are unavoidable. Commonly these systems can be regarded as an elastic multi-mass systems can be regarded as an elastic multi-mass system which is dealt with this contribution. S high performance speed or position control can only be achieved with the considering of the mechanical elastic characteristics of the system. n this paper some practic characteristics of the system In this paper some practical information is given about experience in modeling design simulation and experiments for linear elastic multi-mass system,

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Analysis of Settlement and Stress Characteristics about Influence of Track Parameters on Railroad Roadbed by using GEOTRACK (GEOTRACK을 이용한 궤도변수에 따른 침하 및 응력 특성 분석)

  • Shin, Eun-Chul;Lee, Han-Jin;Kang, Jeong-Gu;Yang, Hee-Saeng
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.395-403
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    • 2007
  • Railroad track consists of relatively simple structures such as rail, sleeper, ballast. Roadbed shares vertical pressure by train load which passed through rail to ballast as base that supports the track. For evaluating stress and displacement of roadbed due to the railroad load is an important role on the track as a basic data for estimation of the durability and design of the roadbed thickness. GEOTRACK program applied multi-layered theory was developed for analyzing railroad track structure. GEOTRACK program is a sort of numerical analysis program which has advantage that can analysis component of track by simple method. In this study, this program was used to preform the numerical analysis by changing track conditions and roadbed conditions such as tie, reinforced roadbed, dynamic wheel load, Resilient modulus and so on. Further detail will be presented on the paper.

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Prediction and Evaluation of Rubber Components using Large Deformation Non-linear Finite Element Analysis (비선형 대변형 유한요소해석을 이용한 방진고무부품의 특성예측 및 평가)

  • Woo, Chang-Su;Kim, Wan-Doo;Cho, Seong-Do-Seong
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.286-291
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    • 2000
  • The finite element analyses of mechanical rubber components are executed to predict the behavior of deformation and stress distribution in destgn step. The non-linear properties of rubber which are described as strain energy functions are important parameters to design and evaluate rubber components. These are determined by material tests which are tension, compression and shear test. The behaviors of loads-displacements of rubber components such as a roll tubber spring and resilient ring and additional spring for railway suspension system are evaluated by using commercial FEA code. It is shown that the results by FEA simulations are in close agreement with the test results.

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Interior Noise Reduction for Subway Railroad Vehicles (통근형 지하철의 실내소음저감)

  • 김종년;유동호;박경환
    • Proceedings of the KSR Conference
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    • 1998.05a
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    • pp.265-272
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    • 1998
  • In this paper, the intoner noise reduction for subway railroad vehicles was studied by improving transmission loss of carbody panels and side doors, and on-line tests were conducted to examine the exterior noise levels at various running conditions. Also the transmission loss for design candidates of the carbody specimen was measured in two reverberation rooms. From the results of the tests, side door gap is the most dominant factor affecting the Interior noise level of subway railroad cars with a sliding typed side door. The next one is revealed to transmission loss of a floor panel. To improve the transmission loss of the carbody, many activities were conducted such as, treatment of resilient and sound-absorbing materials and reducing the gap of the side door by adopting a brush and rubber, etc. The estimated interior noise level for modified car which is designed with improved carbody panels is lower than original car by about 5㏈.

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EVALUATION OF SLAG MIXTURE PROPERTIES USING GYRATORY COMPACTOR

  • Lee, Kwan-Ho
    • International Journal of Highway Engineering
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    • v.1 no.2
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    • pp.135-154
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    • 1999
  • Compaction of asphalt pavement is one of the important processes to make good quality one. There are many laboratory-compaction methods to simulate field compaction, including Marshall compaction, Hveem compaction, gyratory compaction, and etc. The most common method used to determine the fundamental properties of asphalt mixture for design is Marshall method which is using impact energy. However, there is major difference between field compaction using kneading compaction and Marshall compaction using impact energy. Therefore, the gyratory compactor, which currently is the best to simulate the field compaction, was employed. The fundamental properties of asphalt specimen compacted by gyratory compactor and Marshall compactor were determined using laboratory test. From the tests, slag mixture with carbon black or pyrolyzed carbon black showed better performances, such as, in low susceptibility to temperature, high resistance against water and rutting, and high resilient modulus and indirect tensile strength.

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Analysis of Influence Factors on Dynamic Properties of Floor Impact Noise Insulation Materials (바닥충격음 완충재의 동적특성에 영향을 미치는 요인 분석)

  • Kim, Heung-Sik;Joo, Si-Woong;Kim, Dae-Jun;Kim, Byeung-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.946-949
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    • 2005
  • In this paper, influence factors on dynamic properties of floor impact noise insulation materials are suggested. For this purpose measurements on the dynamic stiffness and the loss factor of resilient materials are carried out by Korea standard (KS F 2868) according to the change of density, thickness, design pattern, and composition of materials. As a result the values of dynamic stiffness was decreased at high density and thick thickness, and that of loss factor was increased at low density. For dynamic properties, the pattern of lattice and waffle type material is better than that of plat type, and the mixed composition of materials is better than the composition of double layer materials at same thickness.

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Development of Design Method for Reinforced Roadbed Considering Plastic Settlement for High-speed Railway (고속철도에서의 소성침하를 고려한 강화노반 설계기법 개발)

  • Choi, Chan-Yong;Choi, Won-Il;Han, Sang-Jae;Jung, Jae-Hyun
    • Journal of the Korean Geotechnical Society
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    • v.29 no.9
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    • pp.55-69
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    • 2013
  • An alternative design method of existing methods based on elastic theory the design method of roadbed considering plastic deformation of roadbed and stress-strain at roadbed materials with the cyclic loading of trains passing. The characteristics of the developed design method considering traffic load, number of cyclic loading and resilience modulus of roadbed materials can evaluate elastic strain as well as plastic settlement with allowable design criteria. The proposed design method is applied to standard roadbed section drawing of HONAM high-speed railway considering design conditions such as allowable elastic and plastic settlement, train speed, the tonnage of trains. As a result, required levels of resilience modulus model parameter ($A_E$), unconfined compressive strength, types of soil material were evaluated.

Novel Pass-transistor Logic based Ultralow Power Variation Resilient CMOS Full Adder

  • Guduri, Manisha;Islam, Aminul
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.17 no.2
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    • pp.302-317
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    • 2017
  • This paper proposes a new full adder design based on pass-transistor logic that offers ultra-low power dissipation and superior variability together with low transistor count. The pass-transistor logic allows device count reduction through direct logic realization, and thus leads to reduction in the node capacitances as well as short-circuit currents due to the absence of supply rails. Optimum transistor sizing alleviates the adverse effects of process variations on performance metrics. The design is subjected to a comparative analysis against existing designs based on Monte Carlo simulations in a SPICE environment, using the 22-nm CMOS Predictive Technology Model (PTM). The proposed ULP adder offers 38% improvement in power in comparison to the best performing conventional designs. The trade-off in delay to achieve this power saving is estimated through the power-delay product (PDP), which is found to be competitive to conventional values. It also offers upto 79% improvement in variability in comparison to conventional designs, and provides suitable scalability in supply voltage to meet future demands of energy-efficiency in portable applications.