Circular Security Reconsidered

The notion of circular security of pseudorandom functions (PRF) was introduced in Distance Bounding Protocols. So far, only a construction based on a random oracle model was proposed. Circular security stands between two new notions which we call Key Dependent Feedback (KDF) security and Leak security. So far, only a construction based on a random oracle was proposed. We give an algebraic construction based on a q-DDH assumpsion. We first prove that a small-domain Verifiable Random Functions (VRF) from Dodis-Yampolskiy is a circular secure PRF. We then use the extension to large-domain VRF by augmented cascading by Boneh et. al. This gives the first construction in the standard model

Providing Meteorological and Hydrographic Information via AIS Application-Specific Messages: Challenges and Opportunities

AIS Application-Specific Messages (ASMs) transmitted in binary format will be increasingly used to digitally communicate maritime safety/security information between participating vessels and shore stations. This includes time-sensitive metrological and hydrographic (met/hydro) information that is critical for safe vessel transits and efficient ports/waterways management. IMO recently published a new Safety-of-Navigation Circular (SN.1./Circ.289) that includes a number of meteorological and hydrographic message applications and data parameters. While there are no specific display standards for AIS ASMs on shipborne or shore-based systems, IMO Has also issued general guidance for the presentation/display of ASMs (SN.1/Circ.290). It includes specific mention of conforming to the e-Navigation concept-of-operation. For any new IHO S-57 or S-100-related product specifications dealing with dynamic met/hydro information, IHO and its Member States should use the same data content fields and parameters that are defined in IMO SN.1/Circ.289. Also, there is a need to consider the implications of IMO guidance regarding the presentation/display of AIS ASMs on ECDIS

Shutdown of the Federal Government: Causes, Processes, and Effects

[Excerpt] When federal agencies and programs lack appropriated funding, they experience a funding gap. Under the Antideficiency Act, they must cease operations, except in certain emergency situations or when law authorizes continued activity. Failure of the President and Congress to reach agreement on interim or full-year funding measures occasionally has caused government shutdowns, the longest of which lasted 21 days, from December 16, 1995, to January 6, 1996. Government shutdowns have necessitated furloughs of several hundred thousand federal employees, required cessation or reduction of many government activities, and affected numerous sectors of the economy. This report discusses the causes, processes, and effects of federal government shutdowns, including potential issues for Congress

Resource recovery and remediation of highly alkaline residues : a political-industrial ecology approach to building a circular economy

Highly alkaline industrial residues (e.g., steel slag, bauxite processing residue (red mud) and ash from coal combustion) have been identified as stocks of potentially valuable metals. Technological change has created demand for metals, such as vanadium and certain rare earth elements, in electronics associated with renewable energy generation and storage. Current raw material and circular economy policy initiatives in the EU and industrial ecology research all promote resource recovery from residues, with research so far primarily from an environmental science perspective. This paper begins to address the deficit of research into the governance of resource recovery from a novel situation where re-use involves extraction of a component from a bulk residue that itself represents a risk to the environment. Taking a political industrial ecology approach, we briefly present emerging techniques for recovery and consider their regulatory implications in the light of potential environmental impacts. The paper draws on EU and UK regulatory framework for these residues along with semi-structured interviews with industry and regulatory bodies. A complex picture emerges of entwined ownerships and responsibilities for residues, with past practice and policy having a lasting impact on current possibilities for resource recovery

Three-dimensional elasticity solution of an infinite plate with a circular hole

The elasticity problem for a thick plate with a circular hole is formulated in a systematic fashion by using the z-component of the Galerkin vector and that of Muki's harmonic vector function. The problem was originally solved by Alblas. The reasons for reconsidering it are to develop a technique which may be used in solving the elasticity problem for a multilayered plate and to verify and extend the results given by Alblas. The problem is reduced to an infinite system of algebraic equations which is solved by the method of reduction. Various stress components are tabulated as functions of a/h, z/h, r/a, and nu, a and 2h being the radius of the hole and the plate thickness and nu, the Poisson's ratio. The significant effect of the Poisson's ratio on the behavior and the magnitude of the stresses is discussed

A proposed configuration for a stepped specimen to be used in the systematic evaluation of factors influencing warpage in metallic alloys being used for cryogenic wind tunnel models

A proposed configuration for a stepped specimen to be used in the system evaluation of mechanisms that can introduce warpage or dimensional changes in metallic alloys used for cryogenic wind tunnel models is described. Considerations for selecting a standard specimen are presented along with results obtained from an investigation carried out for VASCOMAX 200 maraging steel. Details of the machining and measurement techniques utilized in the investigation are presented. Initial results from the sample of VASCOMAX 200 show that the configuration and measuring techniques are capable of giving quantitative results

More on A Statistical Analysis of Log-Periodic Precursors to Financial Crashes

We respond to Sornette and Johansen's criticisms of our findings regarding log-periodic precursors to financial crashes. Included in this paper are discussions of the Sornette-Johansen theoretical paradigm, traditional methods of identifying log-periodic precursors, the behavior of the first differences of a log-periodic price series, and the distribution of drawdowns for a securities price.Comment: 12 LaTex pages, no figure

Analysis of Organizational Cultural Profile Gaps Using a Cultural Intelligence Web-Based Tool

The performances of the companies involved in the globalization process are conditioned by their managers’ abilities to understand the cultural differences of their stakeholders, to assess the cultural profiles of their business partners and to promote the cultural synergy. Our paper emphasizes the results of a survey that we undertook in the field of Cultural Intelligence (CQ), by analyzing two cultural profiles from a Romanian company and a Tunisian one, using a CQ web-based platform. The answers provided by a sample of employees of each company were processed by the means of the CQ platform facilities. The cultural profiles assessment reveals the cultural gaps between two companies involved in the same type of activities but belonging to different countries and implicitly cultures.cultural intelligence; gap; cultural profile; cross-cultural; globalization.

Kant’s Robust Theory of Grace

In this paper I argue against two prevailing views of Kant’s Religion. Against commentators such as Michalson and Quinn, who have argued that Kant’s project in Religion is riddled with inconsistencies and circularities, I show that a proper understanding of Kant’s views on grace reveals these do not exist. And contra commentators that attribute to Kant at best a minimalist conception of grace, I show that Kant’s view of it is remarkably robust. I argue that Kant works with three different conceptions of grace. These are: a) grace and the God within, b) grace and the transformation of the fundamental orientation, and c) grace that can be laid hold of; the first and the last play a significant role in his philosophy of religion