• 제목/요약/키워드: System Property

검색결과 4,664건 처리시간 0.036초

초전도 특성평가장치용 고온 초전도 마그네트의 개념 설계 (The Conceptual Design of High-Tc superconducting Magnet for a Superconducting Property Measurement System)

  • 최석진;이세연;배준한;손명환;김우석;박찬;이지광;이상진;최경달
    • 한국초전도ㆍ저온공학회논문지
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    • 제11권1호
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    • pp.20-24
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    • 2009
  • The superconducting property measurement system is used to acquire electrical and thermal properties on short HTS tape samples and the system is composed of specimen holder for mounting HTS tape and a magnet for applying magnetic fields externally. The magnet consists of two split racetrack windings and is designed to produce maximum 3T of center field. The temperature of specimen holder can be varied in range from 10K to 77K. The field homogeneity is required less than 300 gauss stray field contour within 20cm axially and 3cm radially from origin. We have worked on the conceptual designs of the conduction-cooled magnet for the superconducting characteristic measurement system. The measurement system will be fabricated in near future based on the design parameters presented in this paper.

비최소 위상 시스템에서 음재생을 위한 역변환 필터의 구현 (An Implementation of Inverse Filter for Sound Reproduction of Non-Minimum Phase System.)

  • 노경래;이상권
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 춘계학술대회논문집
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    • pp.997-1002
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    • 2001
  • This paper describes an implementation of inverse filter using SVD in order to recover the input in multi-channel system. The matrix formulation in SISO system is extended to MIMO system. In time and frequency domain we investigates the inversion of minimum phase system and non-minimum phase system. To execute an effective inversion of non-minimum phase system, SVD is introduced. First of all we computes singular values of system matrix and then investigates the phase property of system. In case of overall system is non-minimum phase, system matrix has one (or more) very small singular value(s). The very small singular value(s) carries information about phase properties of system. Using this property, approximate inverse filter of overall system is founded. The numerical simulation shows potentials in use of the inverse filter.

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Numerical investigation on pressure responsiveness properties of the skirt-cushion system of an air cushion vehicle

  • Xu, Shengjie;Tang, Yujia;Chen, Kejie;Zhang, Zongke;Ma, Tao;Tang, Wenyong
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제12권1호
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    • pp.928-942
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    • 2020
  • The pressure responsiveness property of a skirt-cushion system, which is closely related to the overall performance of Air Cushion Vehicles (ACVs), has always been the difficulty and challenging problem involving cushion aerodynamics and flexible skirt dynamics. Based on a widely used bag and finger skirt-cushion system, the pressure responsiveness properties are investigated numerically. The physical process and mechanism are analyzed and a numerical method for evaluating the pressure responsiveness property is proposed. A cushion-skirt information communication platform is also presented for interchanging the force and the skirt configuration between cushion aerodynamics and flexible skirt dynamics. The pressure responsiveness of a typical skirt-cushion system is calculated and the results demonstrate that the pressure responsiveness property helps alleviate the influence of the cushion height changing on the overall performance of ACVs. Finally, the influences of skirt geometrical and cushion aerodynamic parameters on the pressure responsiveness properties are discussed systematically, giving insight into the design of skirt-cushion systems.

여성용 Knit Block의 신장률 배분 방식에 관한 연구 (A Study on the Distribution Methods of Tensile Property for Women′s Knit Block)

  • 허은영;조진숙
    • 대한가정학회지
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    • 제42권8호
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    • pp.203-218
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    • 2004
  • Recently, knitted materials are used more often than ever before in fashion. Therefore it is necessary to study their application into garment patterns. The purpose of this study was to develop a system by which the tensile property of knitted fabrics can be applied. In this study, 5 different distribution methods of tensile property were tested on 2 sample fabrics which have a lower and higher tensile property than moderate-stretch. The subjects were five women within an age range from 18 to 24 who showed average body figures. The major findings derived from this investigation were as follows; The 4th method was regarded as the most valid. The 4th method was fixed proportional alteration based on the reduction amount of bust girth, i.e. front (back) width and shoulder width reduced by 60% of the bust girth reduction and neck point reduced by 28% of the bust girth reduction. When the reduction was based on the proportion of the actual measurements, the alteration was too severe, so that the armhole curve was changed into a very uncomfortable curve.

곧은 사각채널을 통과하는 물성 변화가 큰 유동에 대한 수치해석 (NUMERICAL STUDIES ON FLOWS WITH STRONG PROPERTY VARIATIONS THROUGH STRAIGHT RECTANGULAR CHANNELS)

  • 최남정;최윤호
    • 한국전산유체공학회지
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    • 제12권4호
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    • pp.74-84
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    • 2007
  • The flowfield characteristics in a straight rectangular channel have been investigated through a numerical model to analyze the regenerative cooling system that is used in rocket engine cooling. The supercritical hydrogen coolant introduces strong property variations that have a major influence on the developing flow and heat transfer characteristics. Of particular interest is the improved understanding of the physical characteristics of such flows through parametric studies. The approach used is a numerical solution of the full Navier-Stokes equations in the three dimensional form including the arbitrary equation of state and property variations. The present study compares constant and variable property solutions for both laminar and turbulent flow. For laminar flow, the variation of aspect ratio is examined, while for turbulent flow, the effects of variation of channel length and Reynolds number are discussed.

TRANSITIVITY, TWO-SIDED LIMIT SHADOWING PROPERTY AND DENSE ω-CHAOS

  • Oprocha, Piotr
    • 대한수학회지
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    • 제51권4호
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    • pp.837-851
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    • 2014
  • We consider ${\omega}$-chaos as defined by S. H. Li in 1993. We show that c-dense ${\omega}$-scrambled sets are present in every transitive system with two-sided limit shadowing property (TSLmSP) and that every transitive map on topological graph has a dense Mycielski ${\omega}$-scrambled set. As a preliminary step, we provide a characterization of dynamical properties of maps with TSLmSP.

납-고무베어링을 적용한 제어장치의 동적평가를 위한 해석적 연구 (Analytical Study to Determine the Dynamic Property of Control Equipment Room using LRB)

  • 김우범;김대곤;이경진;박병구
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 2003년도 추계 학술발표회논문집
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    • pp.473-480
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    • 2003
  • In these days, The base isolation system is often used improve the seismic capacity of the structure Instead of conventional techniques of strengthening the structural members. The purpose of this study is to evaluate dynamic property evaluation of control equipment using Lead Rubber Bearing. In this study, analysis numerical was performed to determine the optimal dynamic property of lead rubber bearing and damper which minimize the response of base from in main control room. Also the analytical results was composed with the test results peformed in previous study

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시소러스와 온톨로지의 상호 호환성에 관한 연구 (A Study on the Interchangeability between a Thesaurus and an Ontology)

  • 조현양;남영준
    • 정보관리학회지
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    • 제21권4호
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    • pp.27-47
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    • 2004
  • 본 연구에서는 다국어 시소러스에 수록된 디스크립터간의 관계를 온톨로지 언어로 표현하는 실험을 수행하였다. 대등관계는 equivalentClass와 equivalentProperty, sameAS 등으로, 그리고 연관관계는 ObjectProperty을 비롯하여 DatatypeProperty, inverseOf 등으로 표현할 수 있었다. 이러한 언어를 기반으로 실제 AAT에 배정된 디스크립터와 ICCD에서 구축한 다국어 시소러스의 디스크립터를 대상으로 디스크립터의 한글화 작업이 수행되었으며, 다국어간 개념일치를 위해 패싯개념이 시소러스 구조에 이용되었다. 본 연구를 통한 실험의 결과 다국어 시소러스를 온톨로지로 표현하기 위해서는 속성관련 온톨로지 언어를 사용하는 것이 가장 효과적임을 확인할 수 있었다.

Processability and Mechanical Characteristics of Glass Fiber and Carbon Fiber Reinforced PA6 for Reinforcement Content

  • Lee, S.B.;Cho, H.S.;Lyu, M.-Y.
    • Elastomers and Composites
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    • 제50권3호
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    • pp.184-188
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    • 2015
  • There is a need for light weight and high stiffness characteristics in the building structure as well as aircraft and cars. So fiber reinforced plastic with the addition of reinforcing agent such as glass fiber, carbon fiber, aramid fiber is utilized in this regard. In this study, mechanical strength, flow property and part shrinkage of glass fiber and carbon fiber reinforced PA6 were examined according to reinforcement content such as 10%, 20%, and 30%, and reinforcement type. The mechanical property was measured by a tensile test with specimen fabricated by injection molding and the flow property was measured by spiral test. In addition, we measured the part shrinkage of fiber reinforced PA6 that affects part quality. As glass fiber content increases, mechanical property increased by 75.4 to 182%, and flow property decreased by 18.9 to 39.5%. And part shrinkage decreased by 52.9 to 60.8% in the flow direction, and decreased by 48.2 to 58.1% in the perpendicular to the flow direction. As carbon fiber content increases, mechanical property increased by 180 to 276%, flow property decreased by 26.8 to 42.8%, and part shrinkage decreased by 65.0 to 71.8% and 69.5 to 72.7% in the flow direction and the direction perpendicular to the flow respectively.

Real 3D Property Integral Imaging NFT Using Optical Encryption

  • Lee, Jaehoon;Cho, Myungjin;Lee, Min-Chul
    • Current Optics and Photonics
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    • 제6권6호
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    • pp.565-575
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    • 2022
  • In this paper, we propose a non-fungible token (NFT) transaction method that can commercialize the real 3D property and make property sharing possible using the 3D reconstruction technique. In addition, our proposed method enhances the security of NFT copyright and metadata by using optical encryption. In general, a conventional NFT is used for 2D image proprietorial rights. To expand the scope of the use of tokens, many cryptocurrency industries are currently trying to apply tokens to real three-dimensional (3D) property. However, many token markets have an art copyright problem. Many tokens have been minted without considering copyrights. Therefore, tokenizing real property can cause significant social issues. In addition, there are not enough methods to mint 3D real property for NFT commercialization and sharing property tokens. Therefore, we propose a new token management technique to solve these problems using integral imaging and double random phase encryption. To show our system, we conduct a private NFT market using a test blockchain network that can demonstrate the whole NFT transaction process.