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  • Bài báo/Newspaper

  • A note on returns to scale in DEA

    • Authors: R.D. Banker (1996)

  • This brief note adds computational convenience and efficiency to the article by Banker and Thrall on returns to scale in DEA by modifying one of their suggestions to avoid the need for examining all alternate optima in order to reach a decision.
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  • On alternative theorems and necessary conditions for efficiency

    • Authors: Do Van Luu (2009)

  • In this article, we establish theorems of the alternative for a system described by inequalities, equalities and a set inclusion, which are generalizations of Tucker’s classical theorem of the alternative, and develop Kuhn–Tucker necessaryconditions for efficiency to mathematical programs in normed linear spaces involving inequality, equality and set constraints with positive Lagrange multipliers of all the components of objective functions
  • Bài báo/Newspaper

  • Second-order optimality conditions in multiobjective optimization problems

    • Authors: B. Aghezzaf (1999)

  • In this paper, we develop second-order necessary and sufficient optimality conditions for multiobjective optimization problems with both equality and inequality constraints. First, we generalize the Lin fundamental theorem (Ref. 1) to second-order tangent sets; then, based on the above generalized theorem, we derive second-order neces sary and sufficient conditions for efficiency.
  • Bài báo/Newspaper

  • Formulation and Estimation of Stochastic Frontier Production Models

    • Authors: Dennis Aigner (1977)

  • Previous studies of the so-called frontier production function have not utilized an adequate characterization of the disturbance term for such a model. In this paper we provide an ap propriate specification, by defining the disturbance term as the sum of symmetric normal and (negative) half-normal random variables. Various aspects of maximum-likelihood estimation for the coefficients of a production function with an additive disturbance term of this sort are then considered.
  • Bài báo/Newspaper

  • A Model for Technical Inefficiency Effects in a Stochastic Frontier Production Function for Panel Data

    • Authors: G. E. Battese (1959)

  • A stochastic frontier production function is defined for panel data on firms, in which the non-negative technical inetGciency effects are assumed to be a function of firm-specific variables and time. The inefficiency effects are assumed to be independently distributed as truncations of normal distributions with constant variance, but with means which are a linear function of observ able variables. This panel data model is an extension of recently proposed models for inefTiciency effects in stochastic frontiers for cross-sectional data. An empirical application of the model is obtained using up to ten years of data on paddy farmers from an Indian village. The null hypo theses, that the inefficiency effects are not stochastic or do not depend on the farmer-specific vari ables and time...
  • Bài báo/Newspaper

  • Approximate Jacobian matrices for nonsmooth continuous maps and C¹-optimization

    • Authors: V. Jeyakumar (1998)

  • The notion of approximate Jacobian matrices is introduced for a continuous vector valued map. It is shown, for instance, that the Clarke generalized Jacobian is an approximate Jacobian for a locally Lipschitz map. The approach is based on the idea of convexificators of real valued functions. Mean value conditions for continuous vector-valued maps and Taylor’s expansions for continuously Gˆateaux differentiable functions (i.e., C1-functions) are presented in terms of ap proximate Jacobians and approximate Hessians, respectively. Second-order necessary and sufficient conditions for optimality and convexity of C1-functions are also given
  • Bài báo/Newspaper

  • Nonsmooth calculus, minimality, and monotonicity of convexificators

    • Authors: V. Jeyakumar (1999)

  • Noncompact convexificators, which provide upper convex and lower concave approximations for a continuous function, are defined. Various calculus rules, including extremality and mean-value properties, are presented. Regularity conditions are given for convexi ficators to be minimal. A characterization of quasiconvexity of a con tinuous function is obtained in terms of the quasimonotonicity of convexificators.
  • Bài báo/Newspaper

  • Ảnh hưởng của sáng kiến xanh đến hoạt động kinh doanh của doanh nghiệp nghiên cứu lý thuyết

    • Authors: Nguyễn Đỗ Quyên (2020)

  • Bài viết hệ thống hóa cơ sở lý luận về các sáng kiến xanh trong hoạt động kinh doanh của doanh nghiệp, đồng thời phân tích và đánh giá ảnh hưởng của sáng kiến xanh đến hoạt động kinh doanh của doanh nghiệp. Kết quả nghiên cứu cho thấy ứng dụng các sáng kiến xanh có ảnh hưởng tích cực đến hoạt động kinh doanh của doanh nghiệp ở các lĩnh vực như hoạt động sản xuất, tài chính, marketing và môi trường. Cụ thể, các sáng kiến xanh góp phần giúp doanh nghiệp tiết kiệm chi phí hoạt động, bảo vệ môi trường và hệ sinh thái, thu hút khách hàng tiềm năng, củng cố sự trung thành của các khách hàng hiện hữu, nâng cao năng lực cạnh tranh của doanh nghiệp và giúp doanh nghiệp hướng tới mục tiêu tăng trưởng bền vững