• Title/Summary/Keyword: structural property

Search Result 87, Processing Time 0.266 seconds

Research on the properties of MLRS launch tube material and structure (MLRS 발사관 소재 및 구조특성 연구)

  • Chae Kyung-Min;Son Hyun-Il;Suh Hyuk;Huh Yoon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • /
    • pp.154-157
    • /
    • 2005
  • MLRS is the weapon system which has been mass-produced since 2004. MLRS launch tube has developed and produced independently refer to the facilities and process condition of General Dynamics Co, USA. The purpose of this research is base establishment for the launch tube performance improvement and application of another weapon system. Research performed about material property, process condition, and structural property.

  • PDF

A classification for the incomplete block designs according to the structure of multi-nested block circulant pattern matrix (다중순환형식행렬의 구조에 의한 불완비블럭 계획의 분류)

  • 배종성
    • The Korean Journal of Applied Statistics
    • /
    • v.2 no.1
    • /
    • pp.54-64
    • /
    • 1989
  • The paper by Kurkjian and Zelen(1963) introducted the Property A which related to a structural property of concordance matrix of the column incidence matrix. On the other hand, Paik(1985) showed the property of the concordance matrix, which has multinested block circulant pattern matrix, and this structural property was termed Property C by Paik(1985). This paper classifies the incomplete block designs according to the pattern of the concordence matrix which has multi-nested block circulant pattern. The purpose of this classification simplified the solution of reduced normal equation and plan of the design.

Structure of the Concordance Matrix Related to Extended Group Divisible Designs

  • Bae Jong-Sung;Kim Sea-Young
    • Communications for Statistical Applications and Methods
    • /
    • v.13 no.1
    • /
    • pp.135-140
    • /
    • 2006
  • The paper by Paik (1985) introduced a structural property of the designs which was related to the concordance matrix $NN^{t}$ of the design. This special property was termed Property-C. The designs which have Property-C need not calculation of the generalize inverse of C matrix for solution of reduced normal equation. Paik also mentioned that some block designs belong to Property-C. This paper show the Extended Group Divisible designs defined by Hinkelmann (1964) are included in Property-C.

Application of Fractal Theory to Various Surfaces

  • Roh, Young-Sook;Rhee, In-Kyu
    • International Journal of Concrete Structures and Materials
    • /
    • v.18 no.1E
    • /
    • pp.23-28
    • /
    • 2006
  • In this study, the general theory of fractality is discussed to provide a fundamental understanding of fractal geometry applied to heterogeneous material surfaces like pavement surface and rock surface. It is well known that many physical phenomena and systems are chaotic, random and that the features of roughness are found at a wide spectrum of length scales from the length of the sample to the atomic scales. Studying the mechanics of these physical phenomena, it is absolutely necessary to characterize such multi scaled rough surfaces and to know the structural property of such surfaces at all length scales relevant to the phenomenon. This study emphasizes the role of fractal geometry to characterize the roughness of various surfaces. Pavement roughness and rock surface roughness were examined to correlate their roughness property to fractality.