Search results for " Match"
showing 10 items of 345 documents
Selection bias ed incentivi alle imprese nei programmi per lo sviluppo locale: una valutazione ex-post
2015
This paper focuses on the evaluation of an aid scheme included in a larger local development program realized in Italy during the 2000-2006 cycle of EU Structural Funds. It follows a previous analysis (Cusimano, Mazzola, 2014) on the ex-post evaluation of the effects of the aid schemes included in the so-called territorial integrated projects (tips) and aims at identifying the possible presence of selection bias in measuring the effectiveness of the policy. After running an empirical analysis based on several propensity score matching (psm) methods, we show that, at least partially, the positive results previously obtained may not be related to an effective success of the policy, but could …
Semantic web service discovery system for road traffic information services
2015
Create a multi-agent platform for a traveller information system (FIPA standards).Extend Paulucci algorithm with the use of seven similarity measures.Weight the similarity measure according to semantic relation and parameter nature.Improved running-time with a filtering pre-process for non-functional parameters.Improved the recall by measuring the sibling relationship concepts. We describe a multi-agent platform for a traveller information system, allowing travellers to find the road traffic information web service (WSs) that best fits their requirements. After studying existing proposals for discovery of semantic WS, we implemented a hybrid matching algorithm, which is described in detail …
A Semantic Layer on Semi-structured Data Sources for Intuitive Chatbots
2009
The main limits of chatbot technology are related to the building of their knowledge representation and to their rigid information retrieval and dialogue capabilities, usually based on simple "pattern matching rules". The analysis of distributional properties of words in a texts corpus allows the creation of semantic spaces where represent and compare natural language elements. This space can be interpreted as a "conceptual" space where the axes represent the latent primitive concepts of the analyzed corpus. The presented work aims at exploiting the properties of a data-driven semantic/conceptual space built using semi-structured data sources freely available on the web, like Wikipedia. Thi…
Bit-Parallel Approximate Pattern Matching on the Xeon Phi Coprocessor
2014
Bit-parallel pattern matching encodes calculated values in bit arrays. This approach gains its efficiency by performing multiple updates within a machine word. An important parameter is therefore the machine word size (e.g. 32 or 64 bits). With the increasing length of vector registers, the efficient mapping of bit-parallel pattern matching algorithms onto modern high performance computing architectures is becoming increasingly important. In this paper, we investigate an efficient implementation of the Wu-Manber approximate pattern matching algorithm on the Intel Xeon Phi coprocessor. This architecture features a 512-bit long vector processing unit (VPU) as well as a large number of process…
I-ChatbIT: An intelligent chatbot for the Italian Language
2014
A novel chatbot architecture for the Italian language is presented that is aimed at implementing cognitive under- standing of the query by locating its cor- respondent subgraph in the agent’s KB by means of a graph matching strategy pur- posely devised. The FCG engine is used for producing replies starting from the se- mantic poles extracted from the candidate answers’ subgraphs. The system imple- ments a suitable disambiguation strategy for selecting the correct answer by analyz- ing the commonsense knowledge related to the adverbs in the query that is embed- ded in the lexical constructions of the ad- verbs themselves as a proper set of fea- tures. The whole system is presented, and a com…
Microfinance beyond self-employment: Evidence for firms in Bulgaria
2017
This paper provides new evidence on the impact of microfinance on job creation beyond self-employment. We examine wage-employment effects for a typical program in Eastern Europe with average loan sizes that are considerably above what has been studied so far. We apply propensity score matching extended by a difference-in-differences estimator to panel data from an individual-lending program to firms in Bulgaria. Our results indicate that microcredit has very positive effects on job creation. Participating firms have on average 2.5 (or 33 percent) more employees two years after receiving a microcredit than matched non-participants. This strong effect seems to be related to a certain loan siz…
Extending the sGLOH descriptor
2015
This paper proposes an extension of the sGLOH keypoint descriptor [3] which improves its robustness and discriminability. The sGLOH descriptor can handle discrete rotations by a cyclic shift of its elements thanks to its circular structure, but its performance can decrease when the keypoint relative rotation is in between two sGLOH discrete rotations. The proposed extension couples together two sGLOH descriptors for the same patch with different rotations in order to cope with this issue and it can be also applied straightly to the sCOr and sGOr matching strategies of sGLOH. Experimental results show a consistent improvement of the descriptor discriminability, while different setups can be …
Post-Enlargement Return Migrants' Earnings Premium: Evidence from Latvia
2008
The paper exploits a recent survey of over ten thousand economically active residents of Latvia; about 5% of respondents have worked abroad over the last three years, while 12% have family members with such experience. Post-enlargement labor migration from Latvia has been predominantly low-skilled, yet return migrants when compared to stayers are, on average, more educated and less likely to work as unskilled manuals. We combine instrumental variable and propensity score matching methods to study the effect of foreign experience on earnings. Results suggest that return migrants are neither positively nor negatively selected in terms of earnings. However, after controlling for worker demogra…
Non-Matrix-Matched Calibration for the Multi-Element Analysis of Geological and Environmental Samples Using 200 nm Femtosecond LA-ICP-MS: A Compariso…
2014
LA-ICP-MS is one of the most promising techniques for in situ analysis of geological and environmental samples. However, there are some limitations with respect to measurement accuracy, in particular for volatile and siderophile/chalcophile elements, when using non-matrix-matched calibration. We therefore investigated matrix-related effects with a new 200 nm femtosecond (fs) laser ablation system (NWRFemto200) using reference materials with different matrices and spot sizes from 10 to 55 μm. We also performed similar experiments with two nanosecond (ns) lasers, a 193 nm excimer (ESI NWR 193) and a 213 nm Nd:YAG (NWR UP-213) laser. The ion intensity of the 200 nm fs laser ablation was much l…
Dynamic Ordering of Firewall Rules Using a Novel Swapping Window-based Paradigm
2016
Designing and implementing efficient firewall strategies in the age of the Internet of Things (IoT) is far from trivial. This is because, as time proceeds, an increasing number of devices will be connected, accessed and controlled on the Internet. Additionally, an ever-increasingly amount of sensitive information will be stored on various networks. A good and effi- cient firewall strategy will attempt to secure this information, and to also manage the large amount of inevitable network traffic that these devices create. The goal of this paper is to propose a framework for designing optimized firewalls for the IoT. This paper deals with two fundamental challenges/problems encountered in such…