Moving Participants Turtle Consensus

We present Moving Participants Turtle Consensus (MPTC), an asynchronous consensus protocol for crash and Byzantine-tolerant distributed systems. MPTC uses various moving target defense strategies to tolerate certain Denial-of-Service (DoS) attacks issued by an adversary capable of compromising a bounded portion of the system. MPTC supports on the fly reconfiguration of the consensus strategy as well as of the processes executing this strategy when solving the problem of agreement. It uses existing cryptographic techniques to ensure that reconfiguration takes place in an unpredictable fashion thus eliminating the adversary's advantage on predicting protocol and execution-specific information that can be used against the protocol. We implement MPTC as well as a State Machine Replication protocol and evaluate our design under different attack scenarios. Our evaluation shows that MPTC approximates best case scenario performance even under a well-coordinated DoS attack.Comment: 31 pages, 4 figures, OPODI

Knowledge Construction of 3D Geometry Concepts and Processes Within a Virtual Reality Learning Environment

A consensus has emerged within the mathematics education community about the limitations of traditional approaches for teaching and learning 3D geometry. Therefore, it has been suggested that new approaches based on the use of computers need to be adopted. One such new approach that has been proposed utilises Virtual Reality Learning Environment (VRLE). This paper reports on the initial phases of a research study whose major aim is to design and evaluate a VRLE to facilitate the construction of knowledge about 3D geometry concepts and processes. This research study investigates two primary school students’ construction of 3D geometry knowledge whilst engaged within a VRLE developed by the researcher. A design experiments research methodology was employed in this study. This is research that iterates through cycles of design and research with the objective of arriving at theoretical and design principles that will have application both within and beyond the immediate research study. Therefore, the results being reported in this paper will be used to inform the modification not only of the VRLE but also of theoretical frameworks underlying the design and implementation of VRLEs

The India MPA Workshop Proceedings. Social Dimensions of Marine Protected Areas Implementation in India: do Fishing Communities Benefit? 21-22 January 2009, IMAGE Auditorium, Chennai, India

In the current context of natural resource management, marine protected areas (MPAs) are being widely propagated as an important tool for the conservation of marine and fisheries resources. The International Collective in Support of Fishworkers (ICSF) recently undertook a series of studies on MPAs in India to highlight the various legal, institutional, policy and livelihoods issues that confront fishing and coastal communities. In order to discuss the findings of these case studies and to suggest proposals for livelihood-sensitive conservation and management of coastal and fisheries resources through participatory processes, ICSF organized a two-day workshop on ‘Social Dimensions of Marine Protected Area Implementation in India: Do Fishing Communities Benefit?’ at Chennai on 21-22 January 2009. This publication—the India MPA Workshop Proceedings—contains the prospectus of the workshop, a report of the proceedings and the consensus statement that was reached by organizations and individuals who particapated in the workshop. This publication will be useful for fishworkers, non-governmental organizations, policymakers, trade unions, researchers and others interested in natural resource management and coastal and fishing communities

Museums After School: How Museums Are Reaching Kids, Partnering With Schools, and Making a Difference

Provides observations and lessons learned by the schools and museums that participated in Irvine's four-year Museum Youth Initiative. Outlines the approach each museum adopted in developing afterschool programs

Carving Out Policy Autonomy for Developing Countries in the World Trade Organization: The Experience of Brazil and Mexico

Although liberal trade and development scholars disagree about the merits of the World Trade Organization (WTO), they both assume that WTO legal obligations restrict states’ regulatory autonomy. This article argues for relaxing this shared assumption by showing that, despite the restrictions imposed by international economic law obligations, states retain considerable flexibility to carve out policy autonomy. The article makes three distinct contributions. First, it analyzes how active WTO members can, through litigation and lawyering, influence rule interpretation to advance their interests. Second, the article redefines the concept of “legal capacity” in the WTO context and introduces the term “developmental legal capacity,” which describes how states can use legal tools and institutions not only as a sword to open new markets but also as a shield for heterodox economic policies. Third, the article offers a comparative analysis of two case studies, Brazil and Mexico, and shows that they have pursued different trade and litigation strategies. While subject to the same WTO obligations, these countries have made different use of their policy space according to their own economic objectives. The article concludes that, despite the apparent rigidity of the WTO, countries following a deliberate strategy can expand their regulatory space to advance their own interests

Comparison of Approaches to Management of Large Marine Areas

In order to learn more about the different approaches to managing large-scale marine areas, their comparative merits, and the synergies and overlaps between them, Conservation International (CI) commissioned this independent analysis of several widely applied models. Since 2004, CI, together with a multitude of partners, has been developing the Seascapes model to manage large, multiple-use marine areas in which government authorities, private organizations, and other stakeholders cooperate to conserve the diversity and abundance of marine life and to promote human well-being. The definition of the Seascapes approach and the identification of the essential elements of a functioning Seascape were built from the ground up, informed by the extensive field experience of numerous marine management practitioners. Although the report was commissioned by CI, the views expressed in this report are those of the authors; they were charged with providing a critical examination of all the assessed approaches, including the Seascapes approach. This analysis provides a comprehensive understanding of the strengths and weaknesses of each approach. This will help us -- and, we hope, other readers -- to identify ways to work together to achieve even greater results through synergistic efforts

Report of the FAO/CRFM/MALMR Regional Workshop on the Collection of Demographic Information on Coastal Fishing Communities and its Use in Community-Based Fisheries and Integrated Coastal Zone Management in the Caribbean

One part of the two-part Science-to-Action Guidebook. The other part was intended for scientists, and this part is for decision-makers. Recognizing the importance of informed decisions and the differences between the scientific and decision-making processes, this guidebook provides practical tips on how to best bring these worlds together. In doing so, this guidebook emphasizes the roles of facilitating, synthesizing, translating, and communicating science to inform conservation action. It is geared toward the perspective of decision-makers working in tropical developing nations and focusing on marine resource management issues. However, the concepts are applicable to a broad range of scientists and decision-makers worldwide

PICES Press, Vol. 19, No. 1, Winter 2011

•2010 PICES Science: A Note from the Former Science Board Chairman (pp. 1-4) •2010 PICES Awards (pp. 5-7) •The First Year of FUTURE: A Progress Report (pp. 8-13) •New Chairmen in PICES (pp. 14-19) •Pacific Ocean Interior Carbon Data Synthesis, PACIFICA, in Progress (pp. 20-23) •2011 PICES Calendar (p. 23) •Ecosystems 2010: Global Progress on Ecosystem-based Fisheries Management (pp. 24-26) •PICES 2010 Rapid Assessment Survey (pp. 27-29) •PICES Workshop on “An Introduction to Rapid Assessment Survey Methodologies for Application in Developing Countries” (pp. 30-31) •The State of the Western North Pacific in the First Half of 2010 (pp. 32-34) •PICES Interns (p. 34) •The State of the Bering Sea in 2010 (pp. 35-37) •The State of the Northeast Pacific in 2010 (pp. 38-40

Soundings: the Newsletter of the Monterey Bay Chapter of the American Cetacean Society. 2007

(PDF contains 88 pages.