Understanding Marx's theory of value: an assessment of a controversy

Trois écoles principals de théorie de valeur marxienne sont identifiées et situées par rapport à des sujets essentiels oú il existe une controverse en matiére de valeur, en particulier le postulat que le travail vital est l'unique source de valeur nouvelle. L'effondrement de la théorie de valeur de l'école ‘orthodoxe’ (Ricardo-marxiste) est attribuée aux raisonnement erroné d'une conceptualisation de la valeur de ‘travail exprimé, une approche rejetée de la même façon par les théoriciens de la valeur ‘néo-orthodoxe’ et ‘fondamentaliste’. Cependant la comparaison des écoles néo-orthodoxe et fondamentaliste révèle que seule cette derniére est compatible avec les objectifs et les postulats essentiels de la théorie de Marx. En même temps, on indique que l'approche fondamentaliste ne pêut etre soutenue que par un engagement explicite à l'idée que le travail abstrait (essence-même de la valeur) existe en tant qu'universel structurel spécifique au capitalisme. Three major schools of Marxian value theory are identified and situated in respect to some pivotal issues of the value controversy, in particular the postulate that living labour is the sole source of new value. The collapse of the ‘orthodox’ (Ricardian-Marxist) school of value theory is attributed to the fallacies of an ‘embodied labour’ conceptualization of value, an approach which has been rejected by ‘neo-orthodox’ and ‘fundamentalist’ value theorists alike. However a comparison of the neo-orthodox and fundamentalist schools reveals that only the latter remains consistent with the objectives and essential postulates of Marx's theory. At the same time, it is argued that the fundamentalist approach can only be sustained through an explicit commitment to the idea that abstract labour (as the ‘substance’ of value) exists as a structural ‘universal’ specific to capitalism.     

Mentoring. Perceptions of the process and its significance

My recommendations are to learn about the mentoring process, prepare for the role, and take advantage of the opportunity to mentor someone, or many people, throughout your professional lifetime. In the process, you will learn about your cognitive, affective, and behavioral competencies and gifts. Share them. Join me and other mentors in knowing that you have opened doors and contributed in more than the usual ways to both well and ill people, to both present and future leaders in nursing or other disciplines, in whatever role, and to society in general. Deepen your generativity.     

The public affairs function in American corporations: Development and relations with corporate planning

The increase of social and political turbulence has led to the development of new organizational response mechanisms. Public affairs units are among the most widely adopted forms in U.S. companies. This paper reports findings from a major research study of the public affairs function in American corporations. Analysis of the public affairs function in several hundred firms strongly suggests that a critical stage in the organization's response to environmental change involves the integration of the corporate planning and public affairs perspective. This paper reviews data from the study and discusses the planning/public affairs relationship in terms of survey and case research data.     

Statistical modelling of artificial neural networks using the multi-layer perceptron

Multi-layer perceptrons (MLPs), a common type of artificial neural networks (ANNs), are widely used in computer science and engineering for object recognition, discrimination and classification, and have more recently found use in process monitoring and control. Training such networks is not a straightforward optimisation problem, and we examine features of these networks which contribute to the optimisation difficulty.Although the original perceptron, developed in the late 1950s (Rosenblatt 1958, Widrow and Hoff 1960), had a binary output from each node, this was not compatible with back-propagation and similar training methods for the MLP. Hence the output of each node (and the final network output) was made a differentiable function of the network inputs. We reformulate the MLP model with the original perceptron in mind so that each node in the hidden layers can be considered as a latent (that is, unobserved) Bernoulli random variable. This maintains the property of binary output from the nodes, and with an imposed logistic regression of the hidden layer nodes on the inputs, the expected output of our model is identical to the MLP output with a logistic sigmoid activation function (for the case of one hidden layer).We examine the usual MLP objective function—the sum of squares—and show its multi-modal form and the corresponding optimisation difficulty. We also construct the likelihood for the reformulated latent variable model and maximise it by standard finite mixture ML methods using an EM algorithm, which provides stable ML estimates from random starting positions without the need for regularisation or cross-validation. Over-fitting of the number of nodes does not affect this stability. This algorithm is closely related to the EM algorithm of Jordan and Jacobs (1994) for the Mixture of Experts model.We conclude with some general comments on the relation between the MLP and latent variable models.     

Estimation of Long-Term Risk from Canadian Uranium Mill Tailings

A methodology is presented for assessing the risk from Canadian uranium mill tailings piles. The methodology is based on the "set of triplets" concept and uses an event tree to identify various scenarios representing the performance of a pile over its 1,000-year design life. Compartment-type mathematical models are used to quantify the movement of hazardous substances through the environment. Numerical examples are given of both "level 1" (straight probabilistic) and "level 2" (probability of frequency) type analyses.     

A short form of the Revised Conflict Tactics Scales, and typologies for severity and mutuality

The revised Conflict Tactics Scales (CTS2) is the most widely used instrument for measuring intimate partner violence. This article presents a short form to enable the CTS2 to be used when testing time is very limited. It also presents procedures that can be used with either the full test or the short form to classify individuals on the basis of severity of behavior toward a partner or by a partner, and to classify couples on the basis of mutuality or symmetry in the behaviors measured by the CTS2. The results indicate that the short form is comparable in validity to the full CTS2. Although the short form does not identify as many cases of partner violence as the full scale, it does identify a large number of cases and if there is insufficient time for the full scale, can be a useful screening instrument.     

Effect of ceasing creatine supplementation while maintaining resistance training in older men

The authors previously found that creatine (Cr) combined with 12 weeks of resistance training enhanced muscle strength and endurance and lean tissue mass (LTM) in older men. Their purpose in this study was to assess these variables with cessation of Cr combined with 12 weeks of reduced training (33% lower volume) in a subgroup of these men (n = 8, 73 years old) compared with 5 men (69 years old) who did not receive Cr. Strength (1-repetition maximum [1-RM]), endurance (maximum number of repetitions over 3 sets at 70-80% 1-RM), and LTM (dual-energy X-ray absorptiometry) were assessed before and after 12 weeks of Cr cessation combined with reduced-volume training. No changes in strength or LTM occurred. Muscle endurance was significantly reduced (7-21%; p <.05), with the rate of change similar between groups. Withdrawal from Cr had no effect on the rate of strength, endurance, and loss of lean tissue mass with 12 weeks of reduced-volume training.     

On a Roll: The Process of Initiation and Cessation of Problem Gambling Among Adolescents

As gambling becomes more accessible and acceptable in society, problems associated with gambling and gaming have begun to affect ever increasing numbers of adolescents. Although restricted from most forms of gambling by law, many adolescents are finding a path into problem gambling. Some are becoming compulsive gamblers early in their gambling career, facing a future filled with consequences and problems. Understanding the pathway or process by which these adolescents become engaged in gambling behavior and how they can extricate themselves from this addictive behavior can enhance the efficiency and effectiveness of our interventions. This article offers a perspective on the initiation and cessation of compulsive gambling using the basic elements of the process of intentional behavior change outlined in the Stages of Change from the Transtheoretical Model. The process of initiation of a problematic behavior is similar to the process of modification or cessation of a problematic behavior in terms of these stages of change. With adolescents it is important to distinguish between the process of initiation, which has implications for prevention of gambling problems, and the process of cessation, which often necessitates the assistance of treatment. Creating interventions that parallel the process of change offers the potential for personalizing and potentiating efforts to reduce the prevalence and consequences associated with compulsive or pathological and problem gambling. Application of this model to gambling behavior offers a heuristic that is intriguing and requires substantiation through rigorous research.     

Something Old,Something New?: Competing Logics and the Hybrid Nature of New Corporate Professions

The professionalization of certain management occupations, such as project management and human resource management, has been neglected in recent debates on professions, which instead focus upon the deregulation of collegial professions or the failure or unwillingness of new expert occupations to professionalize. Project management represents one of a handful of ‘management professions’ which confound this interpretation, explicitly pursuing a ‘corporate professionalization’ project with some degree of success. This paper focuses on the strategic activities of the principal British professional association in this field, the Association for Project Management (APM), as it negotiates a path between exploiting established sources of legitimacy and exploring a novel conception of professionalism. In the process, the association manipulates collegial and corporate logics of professionalism, in terms of its relationships with key stakeholders, its global orientation, its knowledge base and strategies of occupational closure. Drawing on interviews with APM officials and broader documentary analysis, we analyse the conditions which have produced this hybrid model of professionalism, highlighting the pragmatic management of tensions through the combination of distinct, even contradictory, professionalization logics.     

Mixture model clustering using the MULTIMIX program

Hunt (1996) implemented the finite mixture model approach to clustering in a program called MULTIMIX. The program is designed to cluster multivariate data that have categorical and continuous variables and that possibly contain missing values. This paper describes the approach taken to design MULTIMIX and how some of the statistical problems were dealt with. As an example, the program is used to cluster a large medical dataset.