This paper examines the optimal non linear income and commodity tax when the same labor disutility can receive two alternative interpretations, taste for leisure and disability, but the disability is not readily observable. We compare the optimal policy under alternative social objectives, welfarist and non-welfarist, and conclude that the non-welfarist objective, in which the planner gives a h...

In this paper we investigate XSB-Prolog as a static analysis engine for data represented by medium-sized graphs. We use XSB-Prolog to automatically identify function dependencies in the Linux Kernel— queries that are difficult to implement efficiently in a commodity database and that developers often have to identify manually. This project illustrates that Prolog systems are ideal for building ...

The construction of Marine Ranching is a safe, efficient, and sustainable way to achieve marine environmental protection biological resource utilization. In recent years, the in coastal provinces China has developed rapidly, but due late start, ability guarantee ecological security weak. this paper, Pseudosciaena crocea was selected as typical aquaculture species East Sea, by integrating experi...

Recently, the Web Services Interoperability Organization (WS-I) has announced to have completed its interoperability standards work. The latest deliverables include the so-called “Basic Security Profile” and the “Reliable Secure Profile”. This gives rise to the question whether or not Web Services adopters can rely on interoperability and functionality of Web Services stacks, in particular in t...

This paper argues that, in a collaboration context, instead of Web services requiring client applications to comply with individual permutations of security configurations, a standardized mechanism should be established to ensure global security-interoperability. Such a solution would facilitate providing Web services in Grid Services contexts as well. A framework is proposed which comprises, i...

We present a comprehensive modelling framework aimed at quantifying the response of agricultural commodity prices to changes in their potential determinants. The problem model uncertainty is assessed explicitly by concentrating on specification selection based quality short-term out-of-sample forecasts (1 12 months ahead) for price wheat, soybeans and corn. Univariate multivariate autoregressiv...

To be an effective platform for performance-sensitive realtime systems, commodity-off-the-shelf (COTS) distributed object computing (DOC) middleware must support application quality of service (QoS) requirements end-to-end. However, conventional COTS DOC middleware does not provide this support, which makes it unsuited for applications with stringent latency, determinism, and priority preservat...

â â â  â â â  abstract â  using a structural var with block exogeneity, diagonality and identifying restrictions, this paper analyzes: first, the macroeconomic linkages among the oil price, u.s. output, interest rate, money supply, general price level and exchange rate and second, the relationships of the macroeconomic variables with the price indices of ten international nonfuel commodity grou...

The Nelson-Siegel framework is employed to model the term structure of commodity futures prices. Exploiting information embedded in level, slope and curvature parameters, we develop novel investment strategies that assume short-term continuation recent parallel, or butterfly movements curves. Systematic based on change generate significant profits are unrelated previously documented risk factor...