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Currents and Sub-currents in the River of Innovations - Explaining Innovativeness using New-Product Announcements

Dolfsma, Wilfred; van der Panne, G. - Erasmus Research Institute of Management (ERIM), … - 2006

In their seminal paper, Acs and Audretsch (1988) analyze innovation patterns across industries and identify several … innovation; industries characterized by increased shares of skilled labor and large firms provide favorable conditions for … innovation. By analyzing a new and more consciously compiled database, we re-examine their original claims. Our results largely …

Persistent link: https://www.econbiz.de/10010731228

Appropriability in Services

Dolfsma, Wilfred - Erasmus Research Institute of Management (ERIM), … - 2005

paper I take a closer look at one aspect of innovation in services: appropriability. I discuss the different elements that …

Persistent link: https://www.econbiz.de/10010837550

The Process of New Service Development: issues of formilization and appropriability

Dolfsma, Wilfred - Erasmus Research Institute of Management (ERIM), … - 2004

Services form an important part of the economy today. Innovation for service firms is as important as for manufacturing …, but the innovation process for service firms is comparatively little studied. In this paper, I review the literature there … is on the innovation process for service firms, and make two suggestions for formalizing that process. The common thought …

Persistent link: https://www.econbiz.de/10010731080

Entropic Regularization Approach for Mathematical Programs with Equilibrium Constraints

Birbil, Birbil, S.I.; Fang, Fang, S-C.; Han, J. - Erasmus Research Institute of Management (ERIM), … - 2002

A new smoothing approach based on entropic perturbation is proposed for solving mathematical programs with equilibrium constraints. Some of the desirable properties of the smoothing function are shown. The viability of the proposed approach is supported by a computationalstudy on a set of...

Persistent link: https://www.econbiz.de/10010837476

A Deterministic Inventory/Production Model with General Inventory Cost Rate Function and Concave Production Costs

Birbil, Birbil, S.I.; Frenk, Frenk, J.B.G.; Bayindir, … - Erasmus Research Institute of Management (ERIM), … - 2004

We present a thorough analysis of the economic order quantity model with shortages under a general inventory cost rate function and concave production costs. By using some standard results from convex analysis, we show that the model exhibits a composite concave-convex structure. Consequently,...

Persistent link: https://www.econbiz.de/10010837523

Equilibrium Constrained Optimization Problems

Birbil, Birbil, S.I.; Bouza, G.; Frenk, Frenk, J.B.G.; … - Erasmus Research Institute of Management (ERIM), … - 2003

We consider equilibrium constrained optimization problems, which have a general formulationthat encompasses well-known models such as mathematical programs with equilibrium constraints, bilevel programs, and generalized semi-infinite programming problems. Based on the celebrated K K M lemma, we...

Persistent link: https://www.econbiz.de/10010837543

Solving Variational Inequalities Defined on A Domain with Infinitely Many Linear Constraints

Fang, Fang, S-C.; Wu, S.; Birbil, Birbil, S.I. - Erasmus Research Institute of Management (ERIM), … - 2002

We study a variational inequality problem whose domain is defined by infinitely many linear inequalities. A discretization method and an analytic center based inexact cutting plane method are proposed. Under proper assumptions, the convergence results for both methods are given. We also provide...

Persistent link: https://www.econbiz.de/10010837582

An Integrated Approach to Single-Leg Airline Revenue Management: The Role of Robust Optimization

Birbil, Birbil, S.I.; Frenk, Frenk, J.B.G.; Gromicho, … - Erasmus Research Institute of Management (ERIM), … - 2006

In this paper we introduce robust versions of the classical static and dynamic single leg seat allocation models as analyzed by Wollmer, and Lautenbacher and Stidham, respectively. These robust models take into account the inaccurate estimates of the underlying probability distributions. As...

Persistent link: https://www.econbiz.de/10010730861

A Multi-Item Inventory Model With Joint Setup And Concave Production Costs

Bayindir, Bayindir, Z.P.; Birbil, Birbil, S.I.; Frenk, … - Erasmus Research Institute of Management (ERIM), … - 2004

The present paper discusses an approach to solve the joint replenishment problem in a production environment with concave production cost functions. Under this environment, the model leads to a global optimization problem, which is investigated by using some standard results from convex...

Persistent link: https://www.econbiz.de/10010731067

Generalized Fractional Programming With User Interaction

Birbil, Birbil, S.I.; Frenk, Frenk, J.B.G.; Zhang, Zhang, S. - Erasmus Research Institute of Management (ERIM), … - 2004

The present paper proposes a new approach to solve generalized fractional programming problems through user interaction. Capitalizing on two alternatives, we review the Dinkelbach-type methods and set forth the main difficulty in applying these methods. In order to cope with this difficulty, we...

Persistent link: https://www.econbiz.de/10010731285