• Title/Summary/Keyword: 분리해석법

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An Analysis of Hot-Rolling in the Twin-Roll Strip Casting Process by using the Slab Method (슬랩법을 이용한 쌍롤식 박판주조 공정의 열간 압연 해석)

  • Shim, Hyun-Bo
    • Transactions of Materials Processing
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    • v.3 no.1
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    • pp.63-83
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    • 1994
  • In this paper, the slab method have been applied to investigate the strip casting process in which hot coil is produced from molten steel directly. In the twin roll strip casting process, molten steel supplied by the nozzle cools and solidifies due to the heat extraction effect of the rolls and hot rolling of the solidified shell takes place simultaneously. The analysis of hot rolling has been carried out by using the existing results of solidification analysis for the twin roll strip casting process. The current slab method provides basic design data such as roll separation force, rolling torque, rolling power as well as end dam separation force which are required to design strip caster. The effect of friction on the basic process parameters are investigated also. It is shown that the use of appropriate friction coefficient is important and that the characteristics of hot rolling in the twin-roll strip casting process is quite different from the conventional hot rolling processes.

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Numerical Analysis of Combined Natural and Forced Convection Around Cylinders (I) - Nusselt Numbers and Mixed convection Parameters - (실린더로 부터 전달되는 혼합대류 열전달의 수치해석 (I) -열전달계수-)

  • Moon, S.H.;Shih, T.M.;Johnson, A.T.
    • Journal of Biosystems Engineering
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    • v.11 no.1
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    • pp.37-51
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    • 1986
  • 실린더로 부터 Prandtl수가 0.7인 주변공기로 전달되는 혼합대류 열전달현상이 Stream-Vorticitv 함수로 표시된 지배방정식으로 부터 유한차분법에 의해 분석되어졌다. Reynolds수와 Grashof수의 함수로서 혼합대류 열전달에서 Nusselt수의 값들이 조사되어 졌으며 이들로부터 순수자연대류와 혼합대류, 혼합대류와 순수강제대류사이의 범위를 정하였다. 그 외에도 본 연구에서는 실린더주변의 온도분포와, 공기속도분포, 속도분리점(Separation point), 마찰계수, 압력분포등이 조사되어졌으나 제 1편에서는 Nusselt수와 온도분포만이 연구결과로 주어 졌으며, 본시험의 이론적 결과치들은 발표된 실험치들과 잘 일치하였다.

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A Study on the Analysis and Improvement of the Acoustic Characteristics of the Muffler with Complex Geometry (복잡한 형상의 머플러 음향특성 해석 및 개선에 관한 연구)

  • 오상경;모진용;허만선
    • Journal of KSNVE
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    • v.6 no.6
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    • pp.755-762
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    • 1996
  • An acoustic transmission loss analysis method for mufflers with complex geometry is developed using MSC/NASTRAN on the basis of acoustic-structural analogy and two-microphone method. In this study, mufflers with simple and complex shapes are analyzed using this method and compared with theoretical and experimental results to verify it. Applying this method to design of discharge muffler in a rotary compressor, we obtained 2dB(A) of noise reduction in the range of lower than 1300Hz. Futhermore, adopting this technique for a suction muffler in reciprocal compressor, more than 10dB(A) noise reduction at 500Hz, and in total, 3dB(A) noise reduction is achieved.

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The Study for Fracture Parameter J in Rubber-Cord Composites with a Penny-Shaped Crack on Cord-End (고무-코드 복합체 코드-끝 균열에 대한 파괴역학적 매개변수 J에 관한 연구)

  • Yang, Kyeong-Jin;Kang, Ki-Ju
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.304-308
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    • 2000
  • In this work, an equation of J-integral for a penny-shaped crack at the end of the cord embedded in rubber matrix is proposed. The dimensional analysis is applied to derived to the equation of J-integral. We assume that the energy Parameter J is separated into the deformation and the geometry function, and which is proved using by separation parameter.

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Viscoelastic Analysis of Stress Intensity Factor for Interface Edge Crack in a Unidirectional Liminate (단일방향 복합재료의 공유면에 존재하는 계면 모서리균열의 점탄성 해석)

  • 이상순;김범식
    • Computational Structural Engineering
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    • v.10 no.1
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    • pp.129-134
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    • 1997
  • Interfacial stress singularity in a unidirectional two-dimensional laminate model consisting of an elastic fiber and a viscoelastic matrix has been investigated using the time-domain boundary element method. First, the interfacial singular stresses between the fiber and the matrix of a unidirectional laminate subjected to a uniform transverse tensile strain have been investigated near the free surface, but without any defect or any edge crack. Such a stress singularity might lead to fiber-matrix debonding or interfacial edge cracks. Then, the overall stress intensity factor for the case of a small interfacial edge crack of length a has been computed.

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A Legal Study on the Vessel Traffic Services (해상교통관제의 법적 문제에 대한 일고찰)

  • Kim, Jin-Kwon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.1
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    • pp.81-87
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    • 2006
  • 해상교총관제는 해상운송에서의 운영적 ${\cdot}$ 환경적 위험을 강소시키기 위한 수단으로써 전 세계 여러 주요 항만과 수역에서 이용되고 있다. 현재 각 국에서는 자국연안에서의 선박통제제도를 적극적으로 실시하고 있으며, 해운의 활성화와 더불어 항만의 안전성 확보를 위하여 각국은 VTS에 관한 국내법을 제정하여 이를 시행하고 있다. 우리나라도 VTS와 관련하여 여러 규정들을 두고 있으나 각 개별입법 내에 산재해 있는 실정이며, VTS를 운영하는 관제요원의 책임과 권한을 명확하게 규정하고 있지 아니하다. 이에 향후 VTS 운영과 관련한 법제의 정비에 관한 논의를 촉진시키는 선행연구로써 현행 VTS 운영과 관련한 법적 문제점을 지적하고 개선방향을 제시한다. 우선 VTS 관제범위에 관한 논의는 국제법적 측면의 법리 정토가 필요하리라 생각되며, VTS 관제요원의 권한과 책임에 있어 적극적 관제에 대한 개념의 정립과 더불어 관제요원의 재인책임과 중과실 경과실에 대한 해상고유의 특성을 반영한 해석이 되어야 할 것으로 생각된다.

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Cancellation of MRI Artifact (MRI 아티펙트의 제거)

  • Kim, Eung-Kyeu
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.2818-2820
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    • 1999
  • MRI 촬상증의 체동에 의해 화상위에 나타나는 아티팩트를 제거하는 알고리즘으로서, 종래의 발견적인 측차근사 반복법에 의한 제거방법과는 달리, MRI 촬상과정의 해석에 근거해서 도출된 MRI 본래의 성분과 체동성분을 분리하는 구속조건을 이용하는 알고리즘을 제안한다. 이때의 체둥은 위상엔코딩 축인 Y 방향의 체동만을 고려하며, 그 체동의 영향은 MRI 신호의 위상변동으로 나타난다. 일반적으로 위상에는 화상자신의 위상성분과 체동성분이 흔합되어 있지만, 두뇌부위 등의 양단부위에 접하는 Y 방향의 한 라인의 밀도분포는 근사적인 대칭으로 간주할 수 있다. 이 한 라인의 위상스펙트럼, 즉, 화상자신의 성분은 직류성분만으로 구성되며, 체동성분은 일반적으로 모든 주파수에 분포한다. 이러한 구속조건에 기초한 근거가 명확한 아티팩트의 제거방법을 정식화 하며 시뮬레이션에 의해 본 알고리즘의 유효성을 확인한다.

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Analysis of the torque transient performance of the induction motor by means of phase segregation method (상분리법에 의한 유도전동기의 토오크 과도특성해석)

  • Jeong, Jong-Ho;Lee, Eun-Woong;Choi, Jae-Young
    • Proceedings of the KIEE Conference
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    • 2000.11b
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    • pp.247-249
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    • 2000
  • Transient phenomena cause delay in control response and must be studied and eliminated, if possible, suppressed. The difficulty in analyzing transient phenomena in ac machines comes from the large number of windings involved. But, it is possible that only one phase is used to represent three phases of the induction motor as called phase segregation method. The phase segregation method provides equivalent circuits for both the steady and transient states of induction motor. In this paper, analysis of the torque transient of the induction motor be carried out the phase segregation method and confirmed in the possibility of transientless torque control.

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Party Autonomy in Arbitration Agreement: The U.S. Laws (중재합의의 당사자자치에 관한 미국계약법상 해석)

  • Ha, Choong-Lyong
    • Journal of Arbitration Studies
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    • v.29 no.2
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    • pp.89-105
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    • 2019
  • This paper reviews and analyzes the U.S. cases and statutes on the issue of party autonomy in arbitration agreement. Arbitration agreement has been interpreted somewhat differently from general contracts because its legal characteristics are not purely contractual by nature. For example, some legal scholars insist that an arbitration contract is more about an agreement on a process of dispute resolution than a creation of rights and obligations to avoid litigation. Party autonomy was discussed in diverse legal perspectives including contract of adhesion, VKI principle, and separability of arbitration clause. These three legal perspectives are discussed to set the legal relationship between party autonomy and protection of consumers in consumer arbitration. In addition, it was discussed how legal defects in the formation of an arbitration contract can influence the party autonomy. The legal defects that were discussed to analyze the relationship between arbitration agreement and party autonomy included misrepresentation, fraud, mistake, duress, and undue influence.

Isolation and Characterization of Keratinolytic Protein Chicken Feather-Degrading Bacteria (난분해성 케라틴 단백질을 함유하는 닭 우모 분해세균의 분리 및 특성)

  • Kim, Se-Jong;Cho, Chun-Hwi;Whang, Kyung-Sook
    • Korean Journal of Microbiology
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    • v.46 no.1
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    • pp.86-92
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    • 2010
  • Thirty-one chicken feather-degrading bacteria were isolated from wasted feather, compost and wastewater in a chicken farm. These isolates were categorized as Firmicutes (21 strains), ${\gamma}$-proteobacteria (4 strains), Actinobacteria (4 strains), and Bacteroidetes (2 strains) by 16S rRNA gene sequence analysis. We examined the feather-degrading isolates for degradation in the 2% of chicken feather meal. The strain Chryseobacterium sp. FBF-7, Stenotrophomonas maltophilia FBS-4, and Lysinibacillus sp. FBW-3 were selected as a keratinolytic protein degrading bacteria which showed the highest feather degradation of 75-90%. The characteristics of amino acids extracted from chicken feather meal by using keratinolytic protein degrading isolates and chemical method with $Ca(OH)_2$ were analyzed. Total amino acid content of strain Chryseobacterium sp. FBF-7 was 1,661.6 ${\mu}mol$/ml, which was the highest and it was similar with chemical method. And essential amino acid content of total amino acid was thirty-seven percent (619.3 ${\mu}mol$/ml) and 596.9 ${\mu}mol$/ml for keratinolytic protein degrading isolates and chemical method, respectively. The major amino acids were valine, glutamic acid, aspartic acid, glycine, and proline by the strain Chryseobacterium sp. FBF-7 and especially, higher contents of aspartic acid, threonine, serine, cysteine, and tyrosine were detected compared with chemical method.