4변형 평면요소를 컴퓨터 프로그램으로 구현하기 위한 알고리즘

정성진,이민섭,박세희,Jung, Sung-Jin,Lee, Min-Sub,Park, Se-Hee 대한건축학회 2012 대한건축학회논문집 Vol.28 No.4

Many types of quadrilateral plane element are studied in literatures on FEA and implemented in various computer programs. Field engineers use these elements in their new projects according to the manual which is supplied with the program purchased, such as SAP2000, MIDAS, and so on. However, since these computer programs only present the concept and the way of using the commands and give different results in the same structural analysis model according to the element provided by each program, it is difficult to understand the basic theories and differences between these elements. So, it is necessary to establish the basic theories and the programming techniques in common use to consider these elements. In this study, basic theories for the consideration of quadrilateral plane elements with several degrees of freedom are studied first, where some of possible methods are investigated. On the basis of these theoretical backgrounds, an algorithm available in computer program is derived, which calculates the stiffness matrix of these elements in one process, and then a computer program(sNs) is developed based on the theory and algorithm studied. Lastly, some examples using these computerized elements are performed and the analysis results are compared with other commercial-use structural analysis programs used in field engineering for the verification of its fitness and validity.

Isolation of a Leucoanthocyanidin Dioxygenase (LDOX) Gene from a Spray-type Chrysanthemum (Dendranthema × grandiflorum) and Its Colored Mutants

정성진,이긍주,이혜정,김진백,김동섭,강시용,Chung, Sung-Jin,Lee, Geung-Joo,Lee, Hye-Jung,Kim, Jin-Baek,Kim, Dong-Sub,Kang, Si-Yong Korean Society of Horticultural Science 2010 원예과학기술지 Vol.28 No.5

스프레이 국화 'Argus'의 꽃잎으로부터 $DgLDOX$의 전장 cDNA와 genomic DNA를 분리하였고, 감마선 변이원으로부터 유래된 3가지 화색변이체 사이의 다양한 유전자 특성들을 밝혀냈다. cDNA 영역은 1068bp이고 356 amino acid로 변환되었다. Genomic DNA의 크기는 'Argus'에서 1346bp이었고, 3가지 화색 변이체에서는 1363부터 1374의 크기를 나타내었다. $DgLDOX$ 유전자는 두 개의 엑손 사이에 하나의 인트론을 갖고 있는 구조이고, 그 크기는 'Argus'에서 112bp 이지만 3가지 화색 변이체에서는 128 혹은 137bp였다. 이것은 감마선 조사에 의해 인트론 부분에 유전자가 삽입됐다는 것을 나타낸다. DNA 분석 결과 국화의 게놈 내에서는 하나의 $LDOX$ 유전자를 갖는 것이 확인되었다. $DgLDOX$ 유전자의 발현 정도를 분석한 결과, 연분홍의 'Argus'와 두 개의 보라색 변이체(AM1 and AM3) 에서 높게 발현되었으나 흰색 변이체(AM2)에서는 매우 약하게 발현되었다. 이러한 결과들은 $DgLDOX$ 유전자의 인트론에 삽입된 유전자 조각 혹은 엑손 부위의 일부 아미노산의 변화에 의해서 변이체의 화색이 변할 수 있다는 것을 보여주고 있다. A full-length cDNA and genomic DNA of a $leucoanthocyanidin$ $dioxygenase$ ($DgLDOX$) gene was isolated from the petals of chrysanthemum 'Argus', and comparative features of the gene among three flower color mutants derived from a gamma-ray mutagenesis were characterized. The cDNA coding region of the gene was 1068 bp and was translated into 356 amino acids accordingly. The genomic DNA size was 1346 bp for 'Argus', while three mutants revealed ranges of 1363 to 1374 bp. A single intron between two coding exons for the $DgLDOX$ gene was found, of which size was 112 bp for 'Argus', but 128 or 137 bp for three flower color mutants, indicating that a genomic insertion in the intron occurred during the gamma-ray mutagenesis. DNA blot analysis revealed the $DgLDOX$ gene presenting as a single copy in the chrysanthemum genome. The $DgLDOX$ gene was expressed in both 'Argus' of light-pink color and two purple color mutants (AM1 and AM3) but had very weak expression in only white color mutant (AM2). The results demonstrated that variations in the flower color of the mutants might be associated with changes in the amino acid moieties in the coding exons or fragment insertions in the intron of the $DgLDOX$ gene, which potentially resulted in less expression of the gene in the white colored mutant.

정찰용 무인기를 위한 공용데이터링크 모뎀 설계 및 성능 분석

정성진,김영길,이대홍,Jung, Sungjin,Kim, Younggil,Lee, Daehong 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.1

최근 다양한 분야에서 이슈가 되고 활용되는 드론 등을 포함한 무인기체계는 군사분야에서부터 시작되어 다양한 민간분야에서도 활발하게 연구 개발되고 있다. 최근 개발되는 다양한 형태의 무인기체계에서, 지상의 조종장치와 무인기간의 연결을 담당하는 통신체계를 데이터링크라고 한다. 특히, 군 분야의 무인기에서 획득된 감시/정찰용 영상정보 및 무인기의 상태정보를 실시간으로 지상으로 전송하기 위한 공용데이터링크는 특성상 통신의 안정성 확보를 우선으로 한다. 본 논문에서는 정찰용 무인기에서 사용되는 공용 데이터링크의 안정성 확보를 위한 디지털 변복조기의 소요규격을 파악하고, 해당 규격을 만족하기 위한 설계를 제안하였다. 설계된 시스템의 타당성은 구현된 시스템의 성능측정을 통하여 검증하였다. The UAV(Unmanned Aerial Vehicle) system, including the drone of a variety of fields, which has become an issue and utilized in various fields, has begun to develop in military fields and is actively developed in the commercial field. In various types of UAV systems, which have been developed recently, the communication system that is responsible for the connection between the ground control unit and the UAVs is called the data link. Especially, common data link used in military UAVs is required stability of communication to transmit surveillance and reconnaissance intelligence information and UAV's status. In this paper, the requirement for a modem was defined to secure the communication stability of the common data link used in surveillance UAVs. And, the design of the data link modem to satisfy applicable specifications was proposed. The proposed modem design was verified through the performance measurement of the implemented systems.

비정형 구조물 해석을 위한 3차원 곡선형 보요소의 개발

정성진,이민섭,박세희,Jung, Sung-Jin,Lee, Min-Sub,Park, Se-Hee 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8

Recently, a lot of free form buildings, which have irregular structural shape, are constructed frequently in our country. In such buildings, there are many curved beams and columns which have non-prismatic sections occasionally. But, many computer programs commonly used in practice like SAP2000 do not any finite elements available for the structural analysis including these curved members. So, many structural engineers necessarily use the segmented straight-line beam elements for their curved frame members. It makes the inconsistency between analysis model and real structure. Therefore, in this study, a theoretical background of a general curved beam element describing the bent frame member is studied first, then some formulas available in computer programming are derived on the basis of the theoretical background. A computer program, named sNs, was developed using these formulas, and analysis results by sNs are compared with those by some commercial programs and theory.

전통 목구조물 공포의 축강성 산정방법

정성진 ( Jung Sung Jin ),이민섭 ( Lee Min Sup ),김석환 ( Kim Seok Hwan ) 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.17 No.1

모바일 배달 앱 이용의도에 관한 연구: 기술수용모델(TAM)을 적용하여

정성진(Sung-Jin Jung),김학선(Hak-Seon Kim) 한국조리학회 2020 한국조리학회지 Vol.26 No.12

3차원 솔리드-평면 쉘 변환요소의 강성행렬 추정

정성진(Jung, Sung-Jin),이민섭(Lee, Min-Sub) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.7

A structural model consists of many types of finite elements, such as truss, beam, plate, shell and solid element, and so on. With the aid of commercial computer programs, field engineers comfortably use these finite elements at the same time for the modelling and analysis of real structure in their new projects. However, it is still difficult to model the connections and interfaces between different types of finite elements because of mutually ill-matched node numbers and degrees of freedom(d.o.f). To settle these problems, Many researchers studied and proposed various solution methods in literatures on FEA(Finite Element Analysis) and the use of transition elements is considered as one of the solutions. This pater presents an isoparametric formulation for three dimensional transition finite element, especially the solid-flat shell transition element. The proposed solid-flat shell transition element is composed of the solid element with 8 nodes, 3 d.o.f and the flat shell element with 4 nodes, 6 d.o.f for the simple formula derivation and the usefulness of practical applications. Basic theories for solid element and flat shell element are studied at first and a possible method for realizing the solid-flat shell transition element is suggested. On the basis of these theoretical backgrounds, the formula which calculates the stiffness matrix of the solid-flat shell transition element is derived in detail and an algorithm available for computer programming is investigated lastly.

전통목구조해석의 문제점 분석과 개선방안

정성진(Jung, Sung-Jin) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.10

In structure design practical fields, computer programs like MIDAS and SAP2000 etc. are widely used for the evaluation of the structural performance of the Korean traditional wood structures. It is necessary to use a reasonable analysis model and method for the evaluation of the structural performance. Considering the structural characteristics of the Korean traditional wood structures, it is appropriate to analyze lower frame composed of beam-columns and upper frame which is a roof structure separately. Especially, in the analysis including lateral loads like seismic or wind load etc., it seems to be reasonable to analyze lower frame with an assumption of roof frame as a rigid diaphragm. Because connections between columns and beams have very small rotational stiffness, lower frame may be unstable. So, in the structure design practical fields, connections are modelled by using various assumptions and linear analysis is performed mainly. However, irrationality may be included in these assumptions and analysis method unfortunately. Therefore, in this study, problems in the analysis models and methods for the Korean traditional wood structures, used in structure design practical fields, are investigated first, then some improvement plans are proposed on the basis of investigation results. Because the Korean traditional wood structures may have no high lever stabilities, it is necessary to perform geometric nonlinear analysis. So, geometric nonlinear analysis method including P-δ effect is studied.

단일곡률을 갖는 벽요소의 강성행렬식

정성진(Jung Sung-Jin),문정호(Moon Jeong-Ho) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.11

The importance of nonlinear analysis for building structures is more and more increasing recently. In the case of the nonlinear analysis for the shear wall structure system, a macro analytic model with axial spring, shear spring, and bending spring has been used due to economical efficiency and time saving. Although some macro analytic models for shear wall structure are implemented in some computer programs like ETABS, SAP2000, MIDAS, neoMAX-3D, these models are restricted to shallow walls because they have double curvatures. In this study, a method for the transformation of member forces into nodal loads is suggested, and a stiffness matrix based on this transformation method is presented for the analysis of shear wall structure. The stiffness matrix presented in this paper is about a macro analytic model with single curvature. A finite element analysis is performed for the verification of the wall element presented in this paper. Lastly, the results of finite element analysis are compared with theoretical solution and the analysis results using RAM, SAP2000, MIDAS, and neoMAX-3D programs.

CSCW 환경에서의 워크플로우 기반 문서 관리 모델

정성진(S.J. Jung),이승근(S. G. Lee),김남용(N.Y. Kim),왕창종(C.J. Wang) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ

본 연구는 공동작업환경에서 워크플로우 개념을 도입한 문서 관리 모델을 제안하고 이를 시스템으로 설계하였다. 제안된 모델은 문서를 관계, 상태, 흐름의 세가지 측면에서 모델링 할 수 있으며, 오류를 자동 검출 할 수 있는 규칙들을 내장하고 있다. 이러한 모델을 기반으로 문서 관리 시스템을 설계하여, 모델이 구현 및 적용 가능함을 보였다. 제안한 모델과 시스템은 전자 결제 시스템이나 전자 상거래등의 문서의 절차적 처리기 필요한 응용들에서 사용될 수 있다.