Polytechnic University of Milan

About: Polytechnic University of Milan is a education organization based out in Milan, Italy. It is known for research contribution in the topics: Computer science & Finite element method. The organization has 18231 authors who have published 58416 publications receiving 1229711 citations. The organization is also known as: PoliMi & L-NESS.

Cryptographic Traces for Mobile Agents

Abstract: Mobile code systems are technologies that allow applications to move their code, and possibly the corresponding state, among the nodes of a wide-area network. Code mobility is a flexible and powerful mechanism that can be exploited to build distributed applications in an Internet scale. At the same time, the ability to move code to and from remote hosts introduces serious security issues. These issues include authentication of the parties involved and protection of the hosts from malicious code. However, the most difficult task is to protect mobile code against attacks coming from hosts. This paper presents a mechanism based on execution tracing and cryptography that allows one to detect attacks against code, state, and execution flow of mobile software components.

XML-GL: a graphical language for querying and restructuring XML documents

Abstract: The growing acceptance of XML as a standard for semi-structured documents on the Web opens up challenging opportunities for Web query languages. In this paper we introduce XML-GL, a graphical query language for XML documents. The use of a visual formalism for representing both the content of XML documents (and of their DTDs) and the syntax and semantics of queries enables an intuitive expression of queries, even when they are rather complex. XML-GL is inspired by G-log, a general purpose, logic-based language for querying structured and semi-structured data. The paper presents the basic capabilities of XML-GL through a sequence of examples of increasing complexity.

Government, Venture Capital and the Growth of European High-Tech Entrepreneurial Firms

Abstract: Using a new European Union-sponsored firm-level longitudinal dataset, we assess the impact of government-managed (GVC) and independent venture capital (IVC) funds on the sales and employee growth of European high-tech entrepreneurial firms. Our results show that the main statistically robust and economically relevant positive effect is exerted by IVC investors on firm sales growth. Conversely, the impact of GVC alone appears to be negligible. We also find a positive and statistically significant impact of syndicated investments by both types of investors on firm sales growth, but only when led by IVC investors. Our results remain stable after controlling for endogeneity, survivorship bias, reverse causality, anticipation effects, legal and institutional differences across countries and over time and are stable with respect to potential non-linear effects of age and size of entrepreneurial firms. Overall, our analysis casts doubt on the ability of governments to support high-tech entrepreneurial firms through a direct and active involvement in VC markets.