現代産業社會의 人間欲求類型과 大學生 善導

韓榮春,姜珉,申邦鉉 단국대학교 1987 論文集 Vol.21 No.-

Modern Industrial Society has experienced by large-scale development in its structure. At the same time, it has developed into the open society which allows the coexistence of individual freedom and national society. Consequently, more importance has placed on the functional group, which is the basic unit of social components, This means that the function of groups has become differentiated. The individual in modern society should find one's satisfaction only in a group life at the expense of oneself. Since human behavior should rest upon a basis of rational consciousness, human relations themselves from fragmentary but broad spheres. Therefore, although the individual seems to have the broad sphere of activity, in reality, it only maintains convenient relations without deep understanding about the substance of human relations. Change in social structure is related on change in human consciousness and life pattern. Thus, human types become varied and differentiated. The differentiation phenomena resuit in bringing about human desire frustration. The frustration is apt to be expressed in action. Social phenomena mobilized by action are attended with various difficulties in social disorder. As we have seen the characteristics of modern society, this study is trying to analyze human types, contents of desire frustration, student problems, and measures for proper guidance of students. Although there are various theories about human desire types, the study, in behavioristic aspects, examines several theories such as: the five steps of human needs by A.H. Maslow, the concept of human nature and its control tactics by E. Schein, human types of X.Y theory by D, Mcgregor, and so on. It is believed that these scholars express the consciousness of the moderns with relatively realistic and explicit views. In order to analyze what factors cause the desire frustration of the moderns, first the study looks at gereral social factors. Next, it takes the process of analyzing the desire frustration factors of dollege students. Because of the varieties of desire frustration factors depending on human experiences and growth process, the study deals with the factors to which college students are easy to face in college life. In the case of facing desire frustration, it can be shown four patterns of actions as follows: (1) aggressive action, (2) dilinquent action, (3) abstinate action, and (4) subordinate action. It seems that the behaviorial types of modern college students would belong to one of these four patterns. Of course, we must no ignore the fact that many parts of preseat college students run their lives based on historical and societal value. However, there is no way of finding an absolutely excellent formula for frustrated students who need to be guided good, we can only suggest abstract measures following on general login. At this point, consentrating on the characteristics of open societal system, the study emphasizes the maintenance of human interdependent relations with their ecognition of human dignity. The suggestion would provide mere the way of keeping the strictsy stem of reward and punishment under the condition that we allow our latitude in those students to the last minute. In other words, this means that, when students do their best on their responsibilities and their given rights are guaranteed, our suggestion can be verified in logic.

Scientific and technological journals in Vietnam: the current state and direction of development

Banh Tien Long,Nguyen Duc Toan 한국과학학술지편집인협의회 2015 Science Editing Vol.2 No.1

Vietnam is on its way to becoming a more developed country and more integrated into the global community. One of the most important key factors for development is science and technology. Scientific publications bring the most up-to-date information to scientists, researchers, and society. The quality of Vietnam’s scientific journals should be increased to international level. Also, the number of high quality articles published in international journals from Vietnam is limited compared to the number of researchers in Vietnam. There is still no Vietnamese journal indexed in Web of Science up to January 2015; while, three journals has been indexed in Scopus. This article discusses the current scenario of scientific and technological journals in Vietnam and the trend of development to international level.

Topology optimization for fractured target joints in concrete frame using carbon fiber reinforcement

Banh, Thien Thanh(반 티엔 탄),Lee, Dong Kyu(이동규) 한국강구조학회 2019 한국강구조학회 학술대회 발표집 Vol.30 No.1

Topology optimization of multi-directional variable thickness thin plate with multiple materials

Banh, Thanh T.,Lee, Dongkyu Springer-Verlag 2019 Structural and multidisciplinary optimization Vol.59 No.5

Multi-material topology optimization design for continuum structures with crack patterns

Banh, Thanh T.,Lee, Dongkyu Elsevier 2018 Composite structures Vol.186 No.-

<P><B>Abstract</B></P> <P>This study proposes a compliance multi-material topology optimization design of continuum structures with the dependence of crack patterns. Multi-material optimal topology and shape are produced as an alternative to prevent the propagation of crack patterns. The extended finite element method (X-FEM) is used to be a mechanical description approach of strong discontinuity state such as the present cracks. Heaviside enrichment and linear elastic asymptotic displacement fields are added to the finite element approximation without mesh generation near initial cracks. Element density distribution contours of mixing multiple material densities are linked to Solid Isotropic Material with Penalization (SIMP) as a design model. The mathematical formulation of multi-material topology optimization problem solving minimum structural compliance is an alternating active-phase algorithm with the Gauss–Seidel version as an optimization model of optimality criteria. Several numerical examples considering the number, length, angle and location of cracks with or without retrofitting solid passive multi-material verify the efficiency of the present design method using of multiple materials and with the dependence of different crack patterns occurring at continuum structures.</P>

Topology optimization of multiphase elastic plates with Reissner-Mindlin plate theory

Banh, Thanh T.,Lee, Dongkyu,Lee, Jaehong,Kang, Joowon,Shin, Soomi Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.3

This study contributes to evaluate multiphase topology optimization design of plate-like elastic structures with constant thickness and Reissner-Mindlin plate theory. Stiffness and adjoint sensitivity formulations linked to Reissner-Mindlin plate potential energy of bending and shear are derived in terms of multiphase design variables. Multiphase optimization problem is solved through alternative active-phase algorithm with Gauss-Seidel version as an optimization model of optimality criteria. Numerical examples verify efficiency and diversity of the present topology optimization method of Reissner-Mindlin elastic plates depending on multiphase and Poisson's ratio.

Multiple bi-directional FGMs topology optimization approach with a preconditioned conjugate gradient multigrid

Thanh T. Banh,Nam G. Luu,Qui X. Lieu,Jaehong Lee,Joowon Kang,Dongkyu Lee 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.3

This article aims to introduce a multigrid preconditioned conjugate gradient (MPCG)-oriented topology optimization (TO) methodology using multiple bi-directional functionally graded (BFG) models for the first time. For that purpose, the MPCG paradigm is integrated into the TO procedure to more effectively and quickly resolve linear algebraic systems arising from the differential equations' discretization. In addition, a refined BFG material interpolation in Solid Isotropic Material with Penalization (SIMP), which is based on an alternating active-phase algorithm, is produced. In which continuously altered macroscopic material properties are represented by an explicit exponential function. This paper describes the well-founded mathematical formulations for multi-material topology optimization of BFG structures in great detail. Finally, several numerical examples are tested to demonstrate the proposed approach's capability and efficiency.

다중재료를 이용한 판구조물의 위상최적화

탄반티엔 ( Thanh Banh Thien ),이동규 ( Lee Dong Kyu ),호안돈퀘 ( Hoan Doan Quoc ),트란르남 ( Tran Le Nam ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1

The goal of this study is to investigate the effectiveness of the use of multiple materials in plate-like structures structure and provide engineers and designers an appropriate view point of multi-material topology optimization when making decision and information in design. Element density distribution contours of mixing multiple material densities are linked to Solid Isotropic Material with Penalization (SIMP) as a design model. The mathematical formulation of multi-material topology optimization problem solving minimum structural compliance is an alternating active-phase algorithm with the Gauss-Seidel version as an optimization model of optimality criteria. Some numerical examples are considered to illustrate the reliability and accuracy of the present design method for multi-material topology optimization.

Multiphase material topology optimization of Mindlin-Reissner plate with nonlinear variable thickness and Winkler foundation

Thanh T. Banh,Xuan Q. Nguyen,Michael Herrmann,Filip C. Filippou,Dongkyu Lee 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.1

In typical, structural topology optimization plays a significant role to both increase stiffness and save mass of structures in the resulting design. This study contributes to a new numerical approach of topologically optimal design of Mindlin-Reissner plates considering Winkler foundation and mathematical formulations of multi-directional variable thickness of the plate by using multi-materials. While achieving optimal multi-material topologies of the plate with multi-directional variable thickness, the weight information of structures in terms of effective utilization of the material at the appropriate thickness location may be provided for engineers and designers of structures. Besides, numerical techniques of the well-established mixed interpolation of tensorial components 4 element (MITC4) is utilized to overcome a well-known shear locking problem occurring to thin plate models. The well-founded mathematical formulation of topology optimization problem with variable thickness Mindlin-Reissner plate structures by using multiple materials is derived in detail as one of main achievements of this article. Numerical examples verify that variable thickness Mindlin-Reissner plates on Winkler foundation have a significant effect on topologically optimal multi-material design results.

Multi-material topology optimization for crack problems based on eXtended isogeometric analysis

Thanh T. Banh,Jaehong Lee,Joowon Kang,Dongkyu Lee 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.6

This paper proposes a novel topology optimization method generating multiple materials for external linear plane crack structures based on the combination of IsoGeometric Analysis (IGA) and eXtended Finite Element Method (X-FEM). A so-called eXtended IsoGeometric Analysis (X-IGA) is derived for a mechanical description of a strong discontinuity state's continuous boundaries through the inherited special properties of X-FEM. In X-IGA, control points and patches play the same role with nodes and sub-domains in the finite element method. While being similar to X-FEM, enrichment functions are added to finite element approximation without any mesh generation. The geometry of structures based on basic functions of Non-Uniform Rational B-Splines (NURBS) provides accurate and reliable results. Moreover, the basis function to define the geometry becomes a systematic p-refinement to control the field approximation order without altering the geometry or its parameterization. The accuracy of analytical solutions of X-IGA for the crack problem, which is superior to a conventional X-FEM, guarantees the reliability of the optimal multi-material retrofitting against external cracks through using topology optimization. Topology optimization is applied to the minimal compliance design of two-dimensional plane linear cracked structures retrofitted by multiple distinct materials to prevent the propagation of the present crack pattern. The alternating active-phase algorithm with optimality criteria-based algorithms is employed to update design variables of element densities. Numerical results under different lengths, positions, and angles of given cracks verify the proposed method's efficiency and feasibility in using X-IGA compared to a conventional X-FEM.