A Risk Analysis Model in Concurrent Engineering Product Development

Concurrent engineering has been widely accepted as a viable strategy for companies to reduce time to market and achieve overall cost savings. This article analyzes various risks and challenges in product development under the concurrent engineering environment. A three‐dimensional early warning approach for product development risk management is proposed by integrating graphical evaluation and review technique (GERT) and failure modes and effects analysis (FMEA). Simulation models are created to solve our proposed concurrent engineering product development risk management model. Solutions lead to identification of key risk controlling points. This article demonstrates the value of our approach to risk analysis as a means to monitor various risks typical in the manufacturing sector. This article has three main contributions. First, we establish a conceptual framework to classify various risks in concurrent engineering (CE) product development (PD). Second, we propose use of existing quantitative approaches for PD risk analysis purposes: GERT, FMEA, and product database management (PDM). Based on quantitative tools, we create our approach for risk management of CE PD and discuss solutions of the models. Third, we demonstrate the value of applying our approach using data from a typical Chinese motor company.     

General Probability‐Time Tradeoff and Intertemporal Risk‐Value Model

This article proposes an intertemporal risk‐value (IRV) model that integrates probability‐time tradeoff, time‐value tradeoff, and risk‐value tradeoff into one unified framework. We obtain a general probability‐time tradeoff, which yields a formal representation form to reflect the psychological distance of a decisionmaker in evaluating a temporal lottery. This intuition of probability‐time tradeoff is supported by robust empirical findings as well as by psychological theory. Through an explicit formalization of probability‐time tradeoff, an IRV model taking into account three fundamental dimensions, namely, value, probability, and time, is established. The object of evaluation in our framework is a complex lottery. We also give some insights into the structure of the IRV model using a wildcatter problem.     

Design and analysis of mixture experiments with process variable

A mixture experiment is an experiment in which the response is assumed to depend on the relative proportions of the ingredients present in the mixture and not on the total amount of the mixture. In such experiment process, variables do not form any portion of the mixture but the levels changed could affect the blending properties of the ingredients. Sometimes, the mixture experiments are costly and the experiments are to be conducted in less number of runs. Here, a general method for construction of efficient mixture experiments in a minimum number of runs by the method for projection of efficient response surface design onto the constrained region is obtained. The efficient designs with a less number of runs have been constructed for 3rd, 4th, and 5th component of mixture experiments with one process variable.     

A note on a transient queuing system of a linear birth–immigration process in presence of twin births

In this article, we consider a simple transient queuing system, i.e., a linear birth process with immigration in the presence of twin births. We find the differential-difference equation and also the probability-generating function (p.g.f.) for this process. Again, we generalize it into a linear birth process with immigration in the presence of both single birth or twin births and again for the case of multiple births. From the p.g.f. of linear birth process with immigration in the presence of twin births, we find some particular transient queuing processes like linear birth process with twin births and simple immigration process. Direct derivations of mean and variance of these processes are also discussed without using the generating functions.     

The moral basis of sustainable society: the Gandhian concept of ecological citizenship

Dominant approaches to sustainability have focused on environmental governance with efficient mechanisms and technical quick-fixes for regulatory changes and policy reforms within the growth-centred economic model. However, they fail to develop an authentic ‘ecological citizenship’ for a more fundamental change in the framework of moral values guiding individuals' behaviour and attitude towards the environment and their choices to live lightly on earth. This article argues that the transformation to a sustainable society necessitates deeper moral changes and the development of an ecological morality at the individual level as the core of sustainability. The article examines the distinctiveness of the Gandhian approach to ‘ecological citizenship’ within his paradigm of non-violence and ethical holism as an alternative to the dominant thinking. Within his broader moral-philosophical framework, the paper focuses on Gandhi's theories of eco-localism, unity of life, economics of well-being, and the moral praxis of subordinating the material to moral development realized by the human self through an ‘inner revolution’ with a goal to improve the ‘quality of man’, moving beyond the conventional ‘fear–greed’ dichotomy as motivators of behaviour to bring about a societal transformation towards a sustainable society based on freedom, equity, justice, and peace.     

Universal Emancipation: The Haitian Revolution and The Radical Enlightenment

The Black Bard of North Carolina: George Moses Horton and His Poetry. Joan R. Sherman (ed.).Chapel Hill and London: University of North Carolina Press. 1997. 158pp. $29.95 and $12.95. ISBN 0–8078–2341–4.

Martin Delany, Frederick Douglass, and The Politics of Representative Identity. Robert S. Levine. Chapel Hill and London: University of North Carolina Press. 1997. x, 314pp. $45.00 and $18.95. ISBN 0–8078–2323–6.

Nationalism and the Color Line in George W. Cable, Mark Twain, and William Faulkner. Barbara Ladd. Baton Rouge: Louisiana State University Press. 1997. xxi, 197pp. $30.00. ISBN 0–8071–2065–0.

Passing and the Fictions of Identity. Elaine K. Ginsberg (ed.). Durham: Duke University Press. 1996. £43.95 and £15.95. ISBN 0–8223–1755–9.     

Serial Chain Merger Evaluation Model and Application to Mortgage Banking*

Mortgage banking operations can be viewed from a supply chain perspective, where the primary and secondary markets are upstream and downstream chain members, respectively. This article describes a serial‐chain‐merger data envelopment analysis (DEA) model to assess potential gains from the merger of different chain operations. We show that in our framework the merger of different chains with many sub‐chains is efficient within the DEA paradigm if and only if the mergers of sub‐chain members are all efficient. A case study of a banking operations merger is conducted to illustrate and validate the proposed approach. The computations show that merger of operations can result in overall efficiency improvement in the banking industry if the merger preserves the features assumed in the DEA model.     

An Improved Class of Estimators in Two-Phase Sampling Using Two Auxiliary Variables

This article suggests an improved class of estimators under the general framework of two-phase sampling scheme in presence of two auxiliary variables. This class includes a large number of estimators (Chand, 1975 Chand , L. ( 1975 ). Some Ratio-Type Estimator Based on Two or More Auxiliary Variables. Unpublished Ph.D. dissertation, Iowa State University, Iowa . [Google Scholar]; Kiregyera, 1980 Kiregyera , B. ( 1980 ). A chain ratio-type estimator in finite population double sampling using two auxiliary variables . Metrika 27 : 217 – 223 .[Crossref] , [Google Scholar], 3; Mukharjee et al., 1987 Mukharjee , R. , Rao , T. J. , Vijayan , K. ( 1987 ). Regression-type estimators using multiple auxiliary information . Aust. J. Statist. 29 : 244 – 254 . [Google Scholar]) and also the class of estimators suggested by Sahoo et al. (1993 Sahoo , J. , Sahoo , L. N. , Mohanty , S. ( 1993 ). A regression approach to estimation in two phase sampling using two auxiliary variables . Curr. Sci. 65 ( 1 ): 73 – 75 . [Google Scholar]).