A General Upper Bound on the Size of Constant-Weight Conflict-Avoiding Codes

Conflict-avoiding codes are used in the multiple-access collision channel without feedback. The number of codewords in a conflict-avoiding code is the number of potential users that can be supported in the system. In this paper, a new upper bound on the size of conflict-avoiding codes is proved. This upper bound is general in the sense that it is applicable to all code lengths and all Hamming weights. Several existing constructions for conflict-avoiding codes, which are known to be optimal for Hamming weights equal to four and five, are shown to be optimal for all Hamming weights in general.Comment: 10 pages, 1 figur

Capital account regulations and the trading system: a compatibility review

This repository item contains a single issue of the Pardee Center Task Force Reports, a publication series that began publishing in 2009 by the Boston University Frederick S. Pardee Center for the Study of the Longer-Range Future. Spanish version produced by the Center for the Study of State and Society, Buenos Aires. Portuguese version coordinated by Daniela Magalhaes Prates, a contributing author of the report, in collaboration with Ana Trivellato (translator), and Maria Inês Amorozo (graphic designer).This report is the product of the Pardee Center Task Force on Regulating Capital Flows for Long-Run Development and builds on the Task Force´s first report published in March 2012. The Pardee Center Task Force was convened initially in September 2011 as consensus was emerging that the global financial crisis has re-confirmed the need to regulate cross-border finance. The March 2012 report argues that international financial institutions – and in particular the International Monetary Fund – need to support measures that would allow capital account regulations (CARs) to become a standard and effective part of the macroeconomic policy toolkit. Yet some policymakers and academics expressed concern that many nations — and especially developing countries — may not have the flexibility to adequately deploy such regulations because of trade and investment treaties they are party to. In June 2012, the Pardee Center, with the Center for the Study of State and Society (CEDES) in Argentina and Global Development and Environment Institute (GDAE) at Tufts University, convened a second Task Force workshop in Buenos Aires specifically to review agreements at the WTO and various Free Trade Agreements (FTAs) and Bilateral Investment Treaties (BITs) for the extent to which the trading regime is compatible with the ability to deploy effective capital account regulations. This report presents the findings of that review, and highlights a number of potential incompatibilities found between the trade and investment treaties and the ability to deploy CARs. It also highlights an alarming lack of policy space to use CARs under a variety of FTAs and BITs—especially those involving the United States. Like the first report, it was written by an international group of experts whose goal is to help inform discussions and decisions by policymakers at the IMF and elsewhere that will have implications for the economic health and development trajectories for countries around the world

Identifying and enabling core management competencies and compliance factors in high reliability organisations : a study in organisational risk management psychology and training: A small n modified grounded theory qualitative analysis

High reliability entities governed by statutory regulations are required to comply with safety guidelines and specifications. When fatalities or serious injuries occur in otherwise preventable accidents these entities are routinely exonerated from any responsibility by claiming to have ‘systemic management problems’ and their managing coalitions have been able to hide behind the ‘corporate veil’. This thesis maintains that the core managerial competencies needed to prevent preventable accidents, can be acquired through training, particularly if their mastery is mandated by a strong regulatory and compliance regime. The cases chosen for analysis revealed ten core managerial and organisational competencies and compliance as issues of concern, in a small n study Commission of Inquiry and Coronial reports. Other than ‘acts of God’, most accidents resulting in fatalities and serious injury, occur in organisations where prior knowledge of a potential accident existed and this knowledge was not utilised. Most accidents in high reliability organisations might have been prevented if the cascade of events leading to the accidents could have been interrupted. The competencies, revealed by the research as necessary to intervene in the unfolding of preventable accidents, are generally not taught in orthodox management studies programs in higher education institutions. However, when these competencies are inadequate they not only result in accidents but also cause orthodox management problems such as production delays and losses, costly litigation, increasing indemnity insurance and erosion of an organisation’s credibility in the marketplace