MELT - a Translated Domain Specific Language Embedded in the GCC Compiler

The GCC free compiler is a very large software, compiling source in several languages for many targets on various systems. It can be extended by plugins, which may take advantage of its power to provide extra specific functionality (warnings, optimizations, source refactoring or navigation) by processing various GCC internal representations (Gimple, Tree, ...). Writing plugins in C is a complex and time-consuming task, but customizing GCC by using an existing scripting language inside is impractical. We describe MELT, a specific Lisp-like DSL which fits well into existing GCC technology and offers high-level features (functional, object or reflexive programming, pattern matching). MELT is translated to C fitted for GCC internals and provides various features to facilitate this. This work shows that even huge, legacy, software can be a posteriori extended by specifically tailored and translated high-level DSLs.Comment: In Proceedings DSL 2011, arXiv:1109.032

The Patterns of cross-border portfolio investments in the GCC region: do institutional quality and the number of expatriates play a role?

In this paper, we document the determinants of portfolio investments to Gulf Cooperation Council (GCC) economies by bringing up the role played by market forces, cultural anities, and institutional quality. We classify the GCC economies as host to 35 countries as per the Coordinated Portfolio Investment Surveys (CPIS) of the IMF for the period 2001- 2006. Using the CPIS data and data from various other reliable sources and appropriate panel data analysis techniques, we find a number of interesting results: 1) the relatively higher quality of institutional set up in GCC in comparison to other countries; 2) the relative volume of expatriates across source countries in GCC soil; and 3) bilateral factors such as trade linkages between GCC and source countries, all statistically and significantly explain portfolio investments to the GCC region. Additionally, we uncover the existence of a portfolio GCC bias". That is, GCC investors exhibit a strong preference towards their own markets when allocating their cross border nancial asset holdings.International Portfolio Allocation, GCC, Bilateral Linkage, Institutional Quality, Expatriates.

Methodological framework for projecting the potential loss of intraspecific genetic diversity due to global climate change

Background: While research on the impact of global climate change (GCC) on ecosystems and species is flourishing, a fundamental component of biodiversity -- molecular variation -- has not yet received its due attention in such studies. Here we present a methodological framework for projecting the loss of intraspecific genetic diversity due to GCC. Methods: The framework consists of multiple steps that and combines 1) hierarchical genetic clustering methods to define comparable units of inference, 2) species accumulation curves (SAC) to infer sampling completeness, and 3) species distribution modelling (SDM) to project the genetic diversity loss under GCC. We suggest procedures for existing data sets as well as specifically designed studies. We illustrate the approach with two worked examples from a land snail (Trochulus villosus) and a caddisfly (Smicridea (S.) mucronata). Results: Sampling completeness was diagnosed on the third most coarse haplotype clade level for T. villosus and the second most coarse for S. mucronata. For both species, a substantial species range loss was projected under the chosen climate scenario. However, despite substantial differences in data set quality concerning spatial sampling and sampling depth, no loss of haplotype clades due to GCC was predicted for either species. Conclusions: The suggested approach presents a feasible method to tap the rich resources of existing phylogeographic data sets and guide the design and analysis of studies explicitly designed to estimate the impact of GCC on a currently still neglected level of biodiversity

Challenges and opportunities of the China – Gulf Cooperation Council Free Trade Agreement

The free trade agreement between China and the Gulf Cooperation Council (“the GCC”) currently under negotiation is due to become China’s first comprehensive trade and investment agreement with a supranational customs union. The article explores the challenges and opportunities of the proposed China-GCC Free Trade Agreement. It proposes tailor-made recommendations according to the specific interests of both parties

Regional monetary integration in the member states of the Gulf Cooperation Council

The Gulf Cooperation Council (GCC) plans to introduce a single currency by 2010 in its six member states, Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the UAE. This paper focuses on selected macroeconomic and institutional issues and key policy choices which are likely to arise during the process of monetary integration. The main findings are that (i) a supranational GCC monetary institution is required to conduct a single monetary and exchange rate policy geared to economic, monetary and financial conditions in the monetary union as a whole; (ii) GCC member states have already achieved a remarkable degree of monetary convergence, but fiscal convergence remains a challenge and needs to be supported by an appropriate fiscal policy framework; and (iii) there is currently a high degree of structural convergence, although this is expected to diminish in view of the process of diversification in GCC economies, which calls for adequate policy responses.

Detecting a stochastic background of gravitational waves in the presence of non-Gaussian noise: A performance of generalized cross-correlation statistic

We discuss a robust data analysis method to detect a stochastic background of gravitational waves in the presence of non-Gaussian noise. In contrast to the standard cross-correlation (SCC) statistic frequently used in the stochastic background searches, we consider a {\it generalized cross-correlation} (GCC) statistic, which is nearly optimal even in the presence of non-Gaussian noise. The detection efficiency of the GCC statistic is investigated analytically, particularly focusing on the statistical relation between the false-alarm and the false-dismissal probabilities, and the minimum detectable amplitude of gravitational-wave signals. We derive simple analytic formulae for these statistical quantities. The robustness of the GCC statistic is clarified based on these formulae, and one finds that the detection efficiency of the GCC statistic roughly corresponds to the one of the SCC statistic neglecting the contribution of non-Gaussian tails. This remarkable property is checked by performing the Monte Carlo simulations and successful agreement between analytic and simulation results was found.Comment: 15 pages, 8 figures, presentation and some figures modified, final version to be published in PR

An Algorithmic Framework for Strategic Fair Division

We study the paradigmatic fair division problem of allocating a divisible good among agents with heterogeneous preferences, commonly known as cake cutting. Classical cake cutting protocols are susceptible to manipulation. Do their strategic outcomes still guarantee fairness? To address this question we adopt a novel algorithmic approach, by designing a concrete computational framework for fair division---the class of Generalized Cut and Choose (GCC) protocols}---and reasoning about the game-theoretic properties of algorithms that operate in this model. The class of GCC protocols includes the most important discrete cake cutting protocols, and turns out to be compatible with the study of fair division among strategic agents. In particular, GCC protocols are guaranteed to have approximate subgame perfect Nash equilibria, or even exact equilibria if the protocol's tie-breaking rule is flexible. We further observe that the (approximate) equilibria of proportional GCC protocols---which guarantee each of the $n$ agents a $1/n$-fraction of the cake---must be (approximately) proportional. Finally, we design a protocol in this framework with the property that its Nash equilibrium allocations coincide with the set of (contiguous) envy-free allocations

Do Oil-Rich GCC Countries Finance US Current Account Deficit?

Given the secrecy that wraps the flows of the GCC countries petrodollar surpluses to the United States and the pressures on these countries to spend and recycle more, this study attempts to uncover the direct and reverse causal relationships between the GCC financial accounts and the US current account deficit. It examines whether the GCC petrodollar surpluses are a global savings glut (an external factor) that causes the US current account deficit or in contrary this deficit is home-grown and the petrodollar savings glut hypothesis does not hold. It particularly focuses on worlds largest oil exporter to find out if the homegrown deficit hypothesis for the worlds largest oil consumer holds. It also investigates which types of investments or components of GCC financial accounts help cause the US deficit the most. The implications and policy recommendations for this growing source of global external imbalances are also provided. --Capital account,Financial account,Direct and reverse causality